{"id":1585,"date":"2021-04-13T02:43:16","date_gmt":"2021-04-13T02:43:16","guid":{"rendered":"https:\/\/saq0hpur0o.wpdns.site\/?p=1585"},"modified":"2021-07-27T06:49:56","modified_gmt":"2021-07-27T06:49:56","slug":"manual-correction-of-sheet-material","status":"publish","type":"post","link":"https:\/\/www.hecter.cn\/th\/manual-correction-of-sheet-material\/","title":{"rendered":"What is the Sheet Metal Manual Correction"},"content":{"rendered":"

<\/span>\u0e40\u0e27\u0e25\u0e32\u0e2d\u0e48\u0e32\u0e19\u0e42\u0e14\u0e22\u0e1b\u0e23\u0e30\u0e21\u0e32\u0e13: <\/span>49<\/span> \u0e19\u0e32\u0e17\u0e35<\/span><\/p>\n\n\n\n

Eliminate the deformation processing of rice gold components are collectively referred to as correction, manual correction and mechanical correction of a geometric shape is not flat steel structure to the requirements of a product and raw material modification, make its produce a certain degree of plastic deformation, so as to achieve the product required by the geometric correction method, must pass through orthodontic treatment to all kinds of deformation for subsequent processing or assembling.<\/p>\n\n\n\n

Commonly used in sheet metal correction methods are: manual correction<\/a>, mechanical correction, and flame correction three kinds of manual correction is the use of hand tools, the hammer was carried out on the deformation of parts hammer implement the positive solution, it is mainly used for eliminating metal sheet after forming the shape size of defects or restricted by production and processing equipment, can’t use mechanical correction of orthopedic, due to the flexible operation, good effect of correction, low cost, widely used in production; Mechanical correction is generally used for metal raw materials and large sheet metal bad material (sheet metal, steel, etc.) straightening, leveling; Flame correction is mainly used for the straightening and leveling of large cooking gold processing parts. It is especially suitable for the field and non-working site operations because of the little influence of the processing site and equipment.<\/p>\n\n\n\n

The principle of manual correction<\/a> operation is to use hand tools (sledgehammer or hand hammer) to hammer the specific parts of the workpiece on the working platform. By “closing” and “releasing” the blank, the metal in the tighter part is extended, and finally the length of each layer of fiber is consistent, so as to achieve orthopedically. Due to the different material, structure, and deformation causes of sheet metal components, the operation methods of manual correction are also different.<\/p>\n\n\n\n

Operation of Manual Correction of Thin Steel Plate<\/strong><\/h3>\n\n\n\n

In the process of transportation and product manufacturing, the thin steel plate is particularly prone to deformation due to local force, high temperature, or long-term uneven storage in the open air. The correction of sheet steel is a strong skill, relatively difficult operation.<\/p>\n\n\n\n

When correcting, the deformation should first be analyzed according to the deformation of the thin plate, which deformation belongs to, or which basic deformation is combined with the deformation, and on the basis of determining which parts of the thin plate are loose (long fiber) and which parts are tight (short fiber), then the follow-up correction operation.<\/p>\n\n\n\n

The Judgment of Loose and Tight<\/strong><\/h4>\n\n\n\n

“Loose” “tight” is the cold work on the steel plate because the local stress is different, so that the steel plate uneven phenomenon of the name, customarily, the deformation of the material elongation, uneven relaxation state is called “loose”; And the material fiber length has not changed at the place of deformation, and the place in the flat state is called “tight”. When correcting, loosen the tight part or tighten the loose part to achieve the purpose of correction. Hammer hitting the tight part will play the role of releasing.<\/p>\n\n\n\n

The deformation of the steel plate should be checked before correction. The “loose” or “tight” of the steel plate can be judged by experience: the area that looks convex or concave and can fluctuate with the movement of the pressure is the “loose” phenomenon, and the area that looks relatively flat is the “tight” phenomenon. A piece of uneven sheet steel on the platform without a hole, due to its poor rigidity, some parts of the warped, some parts and the platform attached. If the sheet is flat around, can fit the platform, but the middle bulge, that is, the middle loose, tight around; If the thin plate fits the platform in the middle, the periphery twists into a wavy shape, it can be judged that the periphery is loose.<\/p>\n\n\n\n

Some steel plate deformation, the elastic part of the moment difficult to distinguish, can be from the appropriate part of the edge inside the ring hammer, so that it from irregular deformation, into regular deformation, and then relax the tight part. In case of the local serious bulge and inconvenient to relax around, local heating can be carried out on the serious bulge first, so that the bulge can shrink to basically flat, and then cold correction can be carried out. During the correction, the workpiece should be turned over and hammered on both sides.<\/p>\n\n\n\n

Rectifying Operation of Thin Steel Plate<\/strong><\/h4>\n\n\n\n

The deformation forms of the thin steel plate include a bulge in the middle of the sheet, wavy deformation at the edge, and diagonal bending, as shown in the following picture.<\/p>\n\n\n\n

Picture (a) shows the flattening of the bulge in the middle of the sheet. The bulge in the middle indicates that the fibers in the middle of the sheet are longer than those around it, which is commonly referred to as purple around and loose in the middle. Shaped as with a certain water absorption capacity of the wet parts of the tissue paper, protruding from the side of the plane around, protruding edge part in a tight state; Seen from the other side is sunken in the plane around, its edge part is naturally tight. As long as the length of each fiber of the sheet is corrected to a relatively equal length, the leveling effect can be achieved.<\/p>\n\n\n\n

Manual correction, the use of the hammer around the board, starting from the raised around gradually towards to arrows. Picture (a) indicate the position and direction of hammering. The closer to the edge, the greater the hammering density and the greater the hammering intensity are, so as to make the protruding part of the thin plate elongate to the fiber around and change in direct proportion to the radial direction. In this way, the fiber length of the whole sheet tends to be the same, and the bulge in the middle is eliminated. If there are several products adjacent to the surface of the thin plate, it should be gently hammering at the junction of the convex first, so that a number of convex mergers into pieces, and then hammer around according to the method described in front of the flat.<\/p>\n\n\n\n

Picture (b) shows the undulating flattening around the thin plate. This deformation indicates that the fibers in the middle part of the thin plate are shorter than those in the periphery, that is, the periphery of the plate is loose and the center is tight, which is like the thin paper soaked in water and dried in the middle. Manual correction, from all sides to the middle gradually hammer, as shown by the arrow in Figure 3-1 (b), and the density of the hammer point to the middle should gradually increase, hammer strength is also good, so that the middle fiber elongation, the fiber length of the whole sheet tends to be the same, so as to achieve the purpose of correction.<\/p>\n\n\n\n

If the thin plate has irregular deformation such as distortion, the diagonal deformation as shown in picture (c) indicates that there is a tensile stress zone perpendicular to the diagonal direction of the warped line in the middle area of the thin plate, and its tensile stress direction is the long direction of the stress zone. Therefore, it is analyzed that the fiber is shorter than the surrounding fiber in the direction of tensile stress, which leads to deformation. Manual correction, should be along the direction of the stress area at both ends of the gradually began to the middle of the hammer, the purpose is to make the stress area in the direction of the fiber elongation deformation, so that it and the surrounding fiber tend to be the same length of the surface to achieve the purpose of correction.<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

For the correction of the above 3 kinds of deformation, generally can also be used clapper (also known as swinging iron) beat to correct. The clapper is made of a good elastic steel plate with a thickness of 3~5mm, a width of not less than 40mm, and a length of not less than 400mm. The specific size of the clapper depends on the thickness and size of the corrected sheet material.<\/p>\n\n\n\n

Flap with a word when the bulge deformation area (or loose), material fiber by clapper beat around with fiber length shortening deformation tends to be equal, so as to achieve the effect of correction, at the same time, because the clappers are greater than the thickness of the sheet thickness, stiffness is bigger, also can make the material tension part of the compression of fiber elongation and correction. Due to the large contact surface between the clapper and the corrected sheet, the force is uniform, so there is no hammer mark, the correction efficiency is high, but the impact of flapping on the deformation of the material is not the very dog, can only be applied to the large area of initial correction.<\/p>\n\n\n\n

Precautions for Corrective Operation<\/strong><\/h4>\n\n\n\n

In the deformation correction of the bulge in the middle of the thin plate, avoid hammering the bulge directly. Because of the poor normal rigidity of the surface of the thin plate, the bulge is pressed when hammering, and the fiber at the bulge is progressive and longer because of the extrusion. The result is counterproductive, the bulging phenomenon will be more serious.<\/p>\n\n\n\n

In the correction sheet, whether it is to shorten the longer fiber in the convex deformation part or elongate the shorter fiber in the tight part, it should be continuously and evenly advanced from its edge to the deformation center gradually, and the orthopedic strength is also gradually enhanced. The taboos start from the center of deformation respectively, which will lead to more complex deformation and will bring difficulties to the next leveling. In addition, avoid irregular changes in the orthopedic strength, so that the elongation or contraction of the fiber is not uniform and continuous distribution, so as to increase the difficulty for the next correction and increase the workload of correction.<\/p>\n\n\n\n

Non-ferrous Metal Manual Corrective Operation<\/strong><\/h3>\n\n\n\n

The common non-ferrous metals used in sheet metal parts are aluminum alloy and copper alloy, and their mechanical properties are not too high. But in order to improve the processing technology of the material as much as possible, for the metal that can be strengthened by heat treatment, usually use the material in the state of annealing.<\/p>\n\n\n\n

Due to the non-ferrous metal hammer, easy to produce hammer marks on its surface, therefore, in the correction and forming of non-ferrous metal sheet parts, a rubber strip made of thick rubber plate with medium hardness is used as the rectifying tool of whipping workpiece (also known as drawing strip). The purpose of whipping is to make the material at the contact part of the workpiece whipping by the rubber strip produce tangential contraction deformation along the length direction of the rubber strip.<\/p>\n\n\n\n

Rectifying Operation of Flat Sheet Parts<\/strong><\/h4>\n\n\n\n

Non-ferrous metals have good machinability, low hardness value, small plate thickness, and weak surface rigidity in a normal direction. Therefore, it is easy to make it deformation, but it is more difficult to make the whole plate flat, a little influence or improper, will produce new uneven. Therefore, the correction of the nonferrous metal sheets must be careful, light, and have certain operation skills.<\/p>\n\n\n\n

In correction, we should first analyze the deformation of the thin plate, find out its deformation area and essence, and then choose the appropriate method, choose the appropriate part for correction.<\/p>\n\n\n\n

When correcting, we should observe carefully and start slowly. On the basis of the accurate judgment of the deformed parts (the judgment of the “loose” and “tight” parts is the same as that of the thin steel plate mentioned above), the rectifying operation should be carried out reasonably with rectifying methods and tools.<\/p>\n\n\n\n

The common deformation of flat plate parts is the central agitation and the surrounding wavy twisting.<\/p>\n\n\n\n

  • Correction of agitation: The correction operation of agitation is shown in the picture, the convex surface of the plate that produces the aging deformation is placed upward on the platform, and the four corners are slightly pressed so that the workpiece is in contact with the platform around the workpiece. First, a rubber strip is used to whip the whole surface of the board, and the rubber strip is made to cover the agitating area to cause the agitating material to shrink(see picture a). At this point, the overall plate is less agitated, and the boundary between agitated and unagitated is somewhat blurred.<\/li><\/ul>\n\n\n\n
    \n
    \"\"<\/figure><\/div>\n\n\n\n

    Then use the copper hammer or aluminum hammer from the inside to the outside to put around the agitation, hammering point from the edge of the agitation area, select a direction of rotation, and along the direction tangent to the agitation edge line step by step. Hammer points out more and more intensive, and as far as possible even, the purpose is to make through hammer material, the tangential stretching deformation hammer point closer to make the flat hammer incited outside material volume, the greater the hammer point more evenly, make the flat hammer put the corrective effect is better, will not produce new by uneven hammer put small encouraged (see picture b).<\/p>\n\n\n\n

    It should be noted that the above two different correction methods for the same agitating plate are coordinated with each other. As for which method to carry out to what degree, it depends on the specific degree of agitating plate parts and the size of the agitating area. The principle is that each correction method should be maximized to achieve the maximum amount of correction that can be achieved by the method. For the plate correction with a large degree of agitation, it can be carried out several times in steps, and stress relief annealing can be carried out between each combination of corrections. The selection method of each combination of corrections has the same order, that is, the rubber strip in the agitation area is extracted first, and then the hammer is put around until it meets the correction requirements.<\/p>\n\n\n\n

    • The following method can be used to correct the loose edges of the plate, resulting in unstable edges around the plate and wave deformation of the flounces(see picture a)<\/li><\/ul>\n<\/div>\n\n\n\n
      \n
      \"\"<\/figure><\/div>\n<\/div>\n\n\n\n
      \n

      First, the multiple waves on the flounces are decomposed into numerous wavelets. That is, a copper hammer or an aluminum hammer is used to hammer along the loose edges, as shown in picture (b). Then, the plate is turned around and tapped on the platform with a rubber strip (see picture c)to make the loose parts around the plate contract, thus reducing the bulge degree at the large waves of the plate. The large wave is decomposed into numerous small waves, the purpose of which is to transform multiple large wave surfaces into micro-curved but overall flat surfaces, so as to facilitate the rubber strip to lash, so that the plate will produce contraction deformation in numerous small surfaces.<\/p>\n\n\n\n

      After whipping the plate for four weeks, flatten it again as shown in the picture. The inner side of the loose area of the plate is the starting point, and the hammer is put from the outside to the inside. So that the material has a ring to extend, so that can reduce the loose around. The overall roughness caused by motion. When the central area is hammered, The closer the hammering point is to the inside, the more intensive the hammering point is, so as to ensure the uniformity of the hammering from the outside to the inside of the whole plate.<\/p>\n<\/div>\n\n\n\n

      \"\"<\/figure><\/div>\n\n\n\n

      With the elimination of agitation correction, the above for the same elimination of loose around the two different correction methods are mutual cooperation. For the correction of the large degree of looseness, the method of elimination of agitation can also be referred to.<\/p>\n\n\n\n

      \n
      • Correction of loose around the flat hole. For the flat plate with flat holes, the loose deformation around the hole occurs, and the correction method is shown in picture 1. That is, the rubber strip is applied along the edge of the hole tangential to the edge of the hole so that the material is arranged to achieve the purpose of correction.<\/li><\/ul>\n<\/div>\n\n\n\n
        \n
        \"\"<\/figure><\/div>\n<\/div>\n\n\n\n

        For the hole circumference that is seriously loosened, the plate can be placed on the rubber mat and hit the convex edges of the surrounding edges with a copper hammer to make the material contract and achieve the correction effect of the plate (see picture 2). The correction principle is: when the hammer strikes the edge of the bulge around the hole, due to the static friction force between the plate and the rubber pad, the bulge around the hole will compress and deform under the combined action of the hammer force and the reaction force of the rubber pad so that the hole can achieve the effect of leveling.<\/p>\n\n\n\n

        • Strengthen the hole around the “tightening”, the correction of deformation for the hole has flanging and other strengthening holes of the plate, because of the flanging hole in the sheet material around the residual more complex residual stress, there are through the hole in the radial plane of the axis, the compressive stress along the tangential direction of the flanging mouth, etc., therefore, leads to the convex tightening deformation at the outer radius of the flanging fillet and the loosening deformation at the outer edge of the plane. In order to eliminate these deforms, the parts are generally bent down on the mold or bent upon the platform, with a copper hammer put around the hole, so that the residual tensile stress distributed in the material around the hole is changed into residual compressive stress, and the stress around the hole is “loose”, the surface tends to be flat. The other parts are whipped with rubber strips to make the outer edge part of the material shrink and deform to achieve the purpose of leveling, as shown in the picture.<\/li><\/ul>\n\n\n\n
          \n
          \"\"<\/figure><\/div>\n\n\n\n

          Precautions for Corrective Operation<\/strong><\/h4>\n\n\n\n

          The rubber strip beating method can make the thin plate material shrink to achieve the effect of leveling, but because the thin plate and the rubber strip in contact with the instantaneous static friction force are limited, which requires that the yield strength of the corrected material should be low, even non-ferrous metal, must be corrected in the state of “M” (annealing).<\/p>\n\n\n\n

          When choosing to hammer on the platform, the following part of the plate must be cushioned and not suspended. The hammer used should be made of soft hardness materials, such as copper hammer, aluminum hammer, hardwood hammer, rubber hammer, etc., to avoid hammer marks on the surface of the thin plate, and sometimes a plate can be cushioned at the correction of the thin plate, and then hammer the plane to be corrected.<\/p>\n\n\n\n

          Before the hammer is put, it must be analyzed carefully, selected accurately, and operated decisively. It’s not that more work is better. If the selection point is incorrect, the correction may be worse and the operation may not be valid. At the same time, cause the internal stress of the plate increased, the material thickness unevenly serious. This not only increases the cost but also seriously affects the quality of the products.<\/p>\n\n\n\n

          Around the elaboration on the platform or decomposed tablet or wave deformation around the hole edge fluctuation, must be in the ups and downs for refining plate and platform between cushions to a certain hardness of rubber strip, and the hardness is not high copper hammer or hard rubber hammer big waves bulge, the workpiece upward reaction in rubber pad, symmetry in convex wave friction and hammer force convex under the joint action of waves in the material between the three points compression deformation, reduce convex wave height, and even make the large convex wave produces low sinking into two convex waves, bear in mind that at this time can’t put the workpiece directly on the platform, with rigid hammer convex waves. Due to the barrier between the workpiece and platform of rubbing force is limited, convex wave in the material not only between the three points cannot be occurred contraction deformation, and convex wave in three points under partial load, even between a hammer and platform directly under the hammer made by the hammer material thinning deformation due to squash, instead make plate extends and increases the waves.<\/p>\n\n\n\n

          It should be noted that the above non-ferrous metal deformation of various manual correction operation techniques is also applicable to the manual correction of thin steel plate operation.<\/p>\n<\/div>\n\n\n\n

          Operation of Manual Correction of Thick Steel Sheet<\/strong><\/h3>\n\n\n\n

          Steel sheets with a thickness of more than 4mm and made by hot rolling steel ingots are collectively referred to as thick steel plates. Usually, the thickness of the steel plate of 4~25mm is called a medium plate, the steel plate of more than 25mm is called a thick plate, and the thick plate of more than 60mm is called an ultra-thick plate. The common deformation of thick steel plates is bulge deformation and slow bending deformation.<\/p>\n\n\n\n

          There are many correction methods of thick steel sheets, manual correction is cold correction at room temperature, because it will produce a cold hardening phenomenon, so it is only suitable for correction of steel with good plasticity. For very serious deformation or brittleness of steel, such as alloy steel and a long time in the open air rust steel, because poor plasticity can not be used cold correction and the application of thermal correction. Thermal correction is the correction of steel by heating it to 700~1000\u2103.<\/p>\n\n\n\n

          Corrective Operation of Thick Steel Sheet<\/strong><\/h4>\n\n\n\n

          For the deformation of the bulge in the middle of the thick steel plate, the method of manual correction is to place the steel plate on the working platform and make the bulge face up, as shown in the picture. Generally speaking, the thickness of the steel sheet that produces this local convex deformation is generally not too thick. The fibers of the material in the deformation area elongate somewhat than the fibers of the surrounding material, and the direction along the thickness of the plate is roughly the same. Apply a certain pressure on the surface of the deformation zone (press can also be used), because the surrounding material has a large stiffness in the plane direction, at this time, the stress state of the deformation zone material is like the arch beam subjected to transverse load so that the fiber produces a shortening deformation to achieve a leveling effect. For such deformation, the smaller the deformation K and the thicker the plate, the more obvious and reliable the correction effect of the correction method will be. For the frozen thick plate, the plate can be padded on the deformation area, and the convex area can be directly hammered with a hammer so that the fiber at the T starting point will produce the same deformation and achieve leveling. At this time, the purpose of using the plate is to avoid. Hammer marks are produced on the surface of a thick plate due to heavy hammer force.<\/p>\n\n\n\n

          \"\"
          Correction of bulge in the middle of thick steel sheet<\/figcaption><\/figure><\/div>\n\n\n\n

          For the larger deformation of the bulge in the middle of the thick plate, because the elongation of the material fiber in the deformation area is too large, the rigidity of the material around the deformation area decreases. When the same pressure is applied as before, the fiber in the plum-shaped area is only limited shortened, and stuck to the platform, so that the material around the deformation area moves outward. Although the original convex deformation zone is close to the platform, the surrounding materials are tilted upward due to limited circumscribed elongation, resulting in new deformation, as shown in picture (b). Therefore, a good correction method is: first use flame correction point heating method (as shown in the picture a) make middle convex fiber have shrinkage, reduce the height of bulge, of large-area bumps into several small areas of the projection and manual correction method, was applied, will each small bump a flattening deformation and to achieve the whole plate is flat and level.<\/p>\n\n\n\n

          \"\"
          Correction of large deformation of bulge in the middle of thick sheet<\/figcaption><\/figure><\/div>\n\n\n\n

          When the thick steel sheet produces slow bending deformation, the correction method is shown in the picture. That is that the deformed steel sheet is first placed on the working platform so that the concave surface is up, and the pad iron bar is placed on the concave surface of the thick steel sheet, and the method of hammering the steel plate on all sides is adopted (see the picture a) so that the pad iron moves equidistance along the direction of the arrow S in picture b. Due to the small contact area between the upper surface of the hammer and the iron bar, the extrusion stress produced by the hammer is larger, and the fiber tissue of the concave surface gradually elongates, so that the original concave surface deforms in the opposite direction, thus achieving the effect of correction.<\/p>\n\n\n\n

          \"\"
          Correction of slow bending of thick steel sheet<\/figcaption><\/figure><\/div>\n\n\n\n

          Precautions for Corrective Operation<\/strong><\/h4>\n\n\n\n

          For plate thicker, little deformation zone in the middle of the bulging deformation, due to its large bending rigidity, outside the larger load under the action of deformation produced by only a small elastic deformation, deformation effect is significant, therefore suitable for larger load under the corrective method, with the help of high-pressure equipment, as far as possible use equipment to power works, it can reduce the labor intensity of operators, Otherwise, you can use a pad and hammer straight at the bulge of the steel sheet.<\/p>\n\n\n\n

          For the thick plate with the small thickness or the deformation area size is much larger than its thickness, because its bending stiffness is not very large, although it can produce a certain deformation under the external load, it contains a certain amount of elastic deformation, so it is always difficult to achieve the correction effect of leveling. If the hammer number too much, because of the thick plate, the instantaneous impact of platforms and hammer, instead make material fiber elongation deformation, make deformation of convex is more serious, at this point, should first use the flame heating method to reduce on convex deformation degree, deformation of large scale into several small regions of convex deformation on the small, and then use the correct method of thick plate convex deformation on the corrected.<\/p>\n\n\n\n

          For various bending deformation of thick plate, if the thickness is thick and the deformation area is large, it is advisable to use the thermal correction method to reduce the amount of deformation, decompose the large area deformation into a number of small areas, and then use manual correction for correction.<\/p>\n\n\n\n

          For any more complex thick plate deformation, first of all, it should be able to correctly analyze the cause of deformation and deformation of the location, the correction of various deformation, to learn to flexibly use a variety of correction methods according to the specific situation.<\/p>\n\n\n\n

          In cold correction, we often use a sledgehammer, hammer drop point to be accurate, hammer print to be positive, so as the surface of the steel sheet has an obvious hammer mark and affect the quality of the surface of the thick plate. When the hammer force is large, the appropriate pad plate should be added.<\/p>\n\n\n\n

          Do not wear gloves when holding the hammer, so as not to slip out of the hammer to cause accidents and dangerous risks. Before using a sledgehammer, check whether the handle and head are loose, whether there are cracks, and whether there are curls or burrs on the head. If there is such a defect, it must be fixed before use.<\/p>\n\n\n\n

          Manual Correction of Sheet<\/strong><\/h3>\n\n\n\n

          The profiles used in rice gold processing are usually made of plate or rolled angle steel, channel steel, and plate profiles. For different kinds of profiles, the operation methods of manual correction are not the same.<\/p>\n\n\n\n

          Rectifying Operation of Angle Steel Bending Parts<\/strong><\/h4>\n\n\n\n

          Angle steel bending parts are divided into plate Angle steel and hot-rolled Angle steel. The former is the Angle steel pressed by steel plate according to the needs of sheet metal components (hereinafter referred to as plate Angle steel), and the latter is the Angle steel profiles of various specifications directly rolled by steel bell (hereinafter referred to as Angle steel). Because the Angle steel bending parts have the shape of the opening two vertical sides, and the length is often long, so it is easy to have a variety of deformation, the common deformation is external bending, internal bending, distortion, unevenness, and Angle deformation and other forms(See Picture).<\/p>\n\n\n\n

          \"\"
          Deformation of angle steel bending parts<\/figcaption><\/figure><\/div>\n\n\n\n

          Due to the different rolling methods and section sizes, the mechanical properties of the two kinds of Angle steels are quite different. Therefore, their deformation and deformation correction properties are also different.<\/p>\n\n\n\n

          1.Angle steel bending deformation\uff1aIt is the most common, correction can choose a suitable ring, the Angle steel is placed on the ring, and the bend convex upward, the bending area between the two support points of the ring. Hammer the convex part of the Angle steel vertical bending edge to make it reverse bending and achieve correction.<\/p>\n\n\n\n

          • Correction of Angle steel outer bend. When correcting the outside bending of the Angle steel, the side bending of the Angle steel should be placed flat on the steel ring. At this time, the vertical bending edge of the Angle steel is perpendicular to the end face of the steel ring, and the convex part is up. In order to not make the turn Angle when hammer, hammer handle should pick up slightly higher or lower \u03b1 Angle (50 or so), and at the moment of the hammer, in addition to blowing down hard, also with slightly inward pull (hammer handle to raise) for the cause or force pushing outward (lower hammer handle the cause), depending on the location of the hammer stood, as shown in the picture.<\/li><\/ul>\n\n\n\n
            \"\"
            Angle steel outward bending<\/figcaption><\/figure><\/div>\n\n\n\n
            • Correction of the inner bend of angle steel. When correcting the inward bend of the angle steel, the backside of the angle steel should be facing up, and the vertical bending edge of the angle steel should be perpendicular to the supporting end surface of the steel ring, and then hammered to correct. In order to prevent the Angle steel from turning over during striking, the height of the backhand of the hammer handle should be slightly adjusted during hammering, as shown in the picture, in which \u03b1 is about 50″, and it should be slightly pulled or pushed at the moment of striking.<\/li><\/ul>\n\n\n\n
              \"\"
              Angle steel inward bending<\/figcaption><\/figure><\/div>\n\n\n\n
              • Correction of Angle distortion. When correcting the twisted angle steel, the torque opposite to the direction of distortion can be directly applied to the Angle steel-producing distortion, so that it can produce the opposite direction of deformation, so as to achieve the correction effect. The implementation method is to clamp one end of the angle steel with a platform vice and the other end with a wrench and twist it in the opposite direction, as shown in the picture. After the distortion is eliminated, the angle steel edge is leveled and trimmed by hammering.<\/li><\/ul>\n\n\n\n
                \"\"
                Correction of angle steel distortion<\/figcaption><\/figure><\/div>\n\n\n\n
                • Correction of Angle deformation of angle steel. When the angle steel has angular deformation, if the angle is greater than 90″, the angle steel should be placed in the V-shaped groove iron, and the extroverted part should be corrected by hammering with a sledgehammer. Or put the angle steel edge on the platform and hammer it with a sledgehammer to make the included Angle smaller, as shown in pictures (a) and (b). When hammering, start from one end of the angle steel, so easy to correct, and the observed effect is obvious. The corrected part is gradually removed from the platform. When the removed part is more than half of the length, the angle steel should be turned around and corrected from the other end of the angle steel until the full length is correct.<\/li><\/ul>\n\n\n\n

                  When the angle deformation is less than 90″, the correction method is to place the angle bar on the platform, and then place an upper hammer on the inside of the angle bar (see picture c) to enlarge its angle. <\/p>\n\n\n\n

                  \"\"
                  Correction of angle steel deformation<\/figcaption><\/figure><\/div>\n\n\n\n
                  • Correction of the unevenness of a single side of angle steel. When the angle steel has uneven deformation on one side, it is usually corrected by hammering the uneven side on the platform.<\/li><\/ul>\n\n\n\n
                    • Correction of combination deformation of angle steel. If the angle steel has several deformations of different sizes at the same time, the larger part of the deformation should be corrected first, then the smaller part of the deformation should be corrected. If the deformation of the angle steel is a combination of the above basic deformation, that is to say, the deformation of the angle steel includes the above deformation at the same time, then the correct correction sequence is the correction of the distortion, the correction of the angle, the correction of the bending and the correction of the unilateral unbalance. Due to the possibility of new deformation due to the limitation of correction method or improper operation in various corrections, the cycle may appear many times to meet the correction requirements.<\/li><\/ul>\n\n\n\n

                      2. Corrective operation of plate angle steel\uff1aCompared with the angle steel, the rigidity of the plate angle steel is far lower than the angle steel because of its thin thickness, which leads to the deformation of the plate angle steel. The correction of the deformation is more obvious to show the processing characteristics of sheet metal.<\/p>\n\n\n\n

                      • Correction of distortion of plate angle steel. Because of the small torsion stiffness of the plate Angle steel, it can obtain a significant correction effect as long as the hand reverse torsion is used for small parts. When loading, a simple cross-section clamp should be made at both ends of the twisted parts. Because of the stiffness of the clamp, when applying torque, the cross-section at both ends of the plate angle steel will not be distorted. For the correction of the distortion of the plate angle steel with large rigidity, the method can be used to correct the distortion with a wrench on the bench vice. Because the rigidity of the plate angle steel is smaller than that of the hot-rolled Angle steel, if the action is not coordinated, the plate angle steel will produce new bending deformation, or even make the workpiece instability and produce larger and more complex deformation.<\/li><\/ul>\n\n\n\n
                        • Correction of bending of plate angle steel. When the bending deformation occurs in the plate angle steel, the vertical bending surface should be stuck on the platform at this time, from the inner edge of the most serious bending began to gradually hammer, because the width of the plate angle steel side is relatively large, the thickness of the plate is small, the correction effect of the inner edge of the hammer on the inner bending is more obvious. At the same time, should also cross correction of the other always corner edge not flat until both sides of the plate Angle are straight, as shown in picture (a).<\/li><\/ul>\n\n\n\n

                          External bending deformation occurs when the plate is made of angle steel. The surface where the vertical bend occurs should be pasted place on the platform and bend at the side with droop. Between the straight retaining surface with gauge iron pad, with a wooden point against the inner bend of the bend to the straight face hammer. On the one hand, the longitudinal fibers at the bend are stretched due to the hammering; on the other hand, the lateral load is applied to the vertical bending edge, so that the vertical bending edge is reversely deformed and corrected. The angle of the part is half a degree, the radius of the wooden tip is consistent with the inner radius of the bend angle steel, and the width of the wooden tip is preferably 2-3 times its thickness, as shown in picture(b).<\/p>\n\n\n\n

                          \"\"
                          Correction of bending of plate angle steel<\/figcaption><\/figure><\/div>\n\n\n\n
                          • Correction of angle deformation of plate angle steel. When the angle deformation of the plate angle steel is too large, as shown in the picture(a), but the angle steel opening upwards on the V-shaped groove, and use the wooden tip R part against the inner R part of the angle steel to strike, so that the angle reduction correction occurs. The strike generally starts from one end and gradually extends to the middle. When correcting, an angle model should be made in advance for frequent use during the correction.<\/li><\/ul>\n\n\n\n

                            For the correction of the large angle deformation of the longer plate angle steel, it can be as shown in picture(b), but the spacer should be removed, and the two sides of the angle steel should be close to the platform surface and the vertical retaining surface at the back, as shown in Figure b. Hammer row in the direction of the direction, so that the angle of the angle reduction correction.<\/p>\n\n\n\n

                            When the angle of the plate angle steel is too small, the two inner surfaces of the angle steel can be cut outside the round steel. Under the action of the external force shown in picture(b), the two sides of the angle steel tend to rotate around the vertices, thus increasing the angle. The corrective effect.<\/p>\n\n\n\n

                            \"\"
                            Angle correction<\/figcaption><\/figure><\/div>\n\n\n\n
                            • Correction of unevenness on a single side of plate Angle steel. The unsteady deformation of the bending line or two planes on both sides of the bending line caused by the elongation or shortening deformation of the bending line is called the uneven deformation of the plate Angle steel, as shown in the picture. As shown in picture (a), it is caused by the shortening and deformation of the bending line, while as shown in picture (b), it is caused by the elongation and deformation of the bending line. The common characteristic of their deformation is that the two planes of the plate angle steel have curved unevenness. When correcting, first check the fit between the two planes and the platform. If it is empty in the middle, it is the deformation shown in Figure a; if it is empty at both ends, it is the deformation shown in picture (b).<\/li><\/ul>\n\n\n\n

                              For the internal deformation correction shown in the picture (a), one of the methods is to alternately correct the bending on both sides; the second method is to gradually hammer out the inner R bend line smaller than the steel to produce axial elongation to achieve the purpose of correction; The third method is to try to make the outer edge fibers of the plate angle steel produce short-shrinking deformation, such as the deformation of the shrinking machine and the deformation of the flame correction. For the deformation correction shown in picture (b), the common method is to alternately hammer the outer edges on both sides to make the outer edge fibers elongate and deform. When the bending line and the outer edge fibers on both sides produce the same deformation, The plate angle steel is leveled and straightened.<\/p>\n\n\n\n

                              Finally, when there is some unevenness in the flange, you can gently press the board surface on the platform with your hand to find the unevenness and eliminate it point by point.<\/p>\n\n\n\n

                              \"\"
                              Levelling bend<\/figcaption><\/figure><\/div>\n\n\n\n

                              3. Precautions for corrective operation\uff1aDue to the cross-sectional shape and size characteristics of the single flanged piece, its easy deformation characteristics are determined. At the same time, it is determined that the operator does not need to impose a large external load to achieve the purpose of correction.<\/p>\n\n\n\n

                              The first thing to note when correcting is: the applied torque must borrow a rigid plane clamp, especially for plate angle steel, otherwise it will produce section distortion at the torsion end and unevenness and bending of local sections. During the manual correction, the hammer placement points should be evenly distributed in the correction area, and not too concentrated, so as not to cause local material hardening or even cracks. In addition, when performing hammering correction, the bottom of the workpiece should be cushioned. It is strictly forbidden to apply force to the straight side of the angle steel to avoid unevenness or affect the hammering effect. The two sides of the workpiece should be hammered in positive and negative adjustments to avoid local material hardening and affecting the surface quality. The striking point of the hammer should be reasonable, accurate, and effective. The points should be as few as possible. The material of the hammer used should be softer than steel, such as copper hammer, aluminum hammer, and hardwood hammer.<\/p>\n\n\n\n

                              Corrective Operation of Channel Steel<\/strong><\/h4>\n\n\n\n

                              The channel steel section is composed of webs and two symmetrical wing plates connected by the webs. Compared with angle steel, the rigidity of channel steel is much larger, so it is more laborious to correct; but because the cross-section of channel steel is asymmetrical structure, the deformation of channel steel is slightly simpler than that of the corner.<\/p>\n\n\n\n

                              The deformation of channel steel includes vertical bending, side bending, and twisting, as shown in the picture. The bending of the channel steel in the plane of the web is called vertical bending, and the bending in the direction of the wing plate is called side bending. Since the height of the web is larger than the width of the wing, the possibility of side bending deformation is greater than that of vertical bending, and from the perspective of correcting deformation, the correction of vertical bending deformation of channel steel is stronger than its side bending deformation.<\/p>\n\n\n\n

                              \"\"
                              Deformation of channel steel<\/figcaption><\/figure><\/div>\n\n\n\n

                              1. Correction of vertical bending deformation of channel steel: Due to labor intensity, manual correction of channel steel deformation can only be used for smaller channel steel, while large-size channel steel must be corrected by mechanical methods.<\/p>\n\n\n\n

                              • Correction of vertical bending deformation of channel steel. When the vertical bending deformation of the channel steel is corrected, the channel steel can be placed on a simple correction table composed of two parallel round sheets of steel, and the convex part is upward, and the sledgehammer is used to hammer in the plane where the web is located. The hammering force is shown in the picture. As indicated by the arrow, this allows the hammering force to be transmitted from the upper part to the lower part through the web. Because the arc transition between the channel steel web and the wing plate has a large local rigidity, it can prevent the wing plate from being hammered and causing local deformation.<\/li><\/ul>\n\n\n\n
                                \"\"
                                Correction of vertical bending deformation of channel steel<\/figcaption><\/figure><\/div>\n\n\n\n
                                • Correction of side bending deformation of channel steel. The channel side bends are divided into outer and inner bends. The correction method of outward bend is to place the upper convex part of the channel steel flange upwards (as shown in the picture), place it on a simple correction table composed of two parallel round sheets of steel, and hammer the two wings intermittently and symmetrically with a sledgehammer The outer edges of the two wing plates can be corrected for vertical bending deformation, and the lateral bending deformation of its webs can also be easily corrected so that the overall outward bending of the channel can be corrected.<\/li><\/ul>\n\n\n\n
                                  \"\"
                                  Deformation correction<\/figcaption><\/figure><\/div>\n\n\n\n

                                  When the channel steel has inward bending deformation, if the inward bending deformation of the channel steel is a small bending deformation within a larger length, the channel steel can be laid on the platform and used on both sides of the web along the elevation of the two wing plates. The sledgehammer strikes to correct the vertical bending deformation of the wing plate. When hammering, you may have to turn over, as shown in the picture, to correct the local bend in the opposite direction. The side bending deformation of the wing plate is corrected, and the overall deformation of the channel steel is also corrected.<\/p>\n\n\n\n

                                  \"\"
                                  Correction of inward bending deformation of channel steel<\/figcaption><\/figure><\/div>\n\n\n\n

                                  If the inward bending deformation of the channel steel is a small range and a large degree of convex deformation, flame correction is the main thing, because too much knocking will cause the distortion of the cross-section, which will adversely affect the surface quality.<\/p>\n\n\n\n

                                  • Correction of channel steel distortion. When correcting the distortion of the channel steel, first place the channel steel on the platform obliquely, so that the twisted and warped part protrudes out of the platform, then use a sledgehammer or clamp to press the channel steel, and hammer the side of the protruding platform part that is warped, Make it reverse to twist, move the channel steel into the platform while hammering (as shown in the picture an S direction), and then turn around and perform the same hammering until it is straightened.<\/li><\/ul>\n\n\n\n
                                    \"\"
                                    Correction of channel steel distortion<\/figcaption><\/figure><\/div>\n\n\n\n

                                    The torsion of the channel steel is generally accompanied by bending, which increases the difficulty of correction. Picture (b) shows the combined deformation of the bending and torsion of the channel steel caused by the different degrees of vertical bending of the two wing plates of the channel steel. The usual correction method is as follows: firstly, the unequal number of flame heating points are drawn on the two wings of the same length according to the degree of distortion, and the wings with large vertical bending deformation have more points and vice versa. When the flame is heated, the heating points on the two wing plates are heated as much as possible simultaneously, and the two wing plates are corrected at the same time. If the points are selected and operated properly, a satisfactory correction effect can be obtained through one heating. Finally, proper manual shaping can completely eliminate the original deformation.<\/p>\n\n\n\n

                                    • Correction of other deformations of channel steel. When the channel steel wing plate is partially deformed, as shown in the figure, a sledgehammer can be used to press against the flat part immediately adjacent to the channel steel protrusion, or the entire sledgehammer can be pressed against the back of the convexity laterally, and then another sledgehammer Hit the outer surface of the protruding part to straighten the curved fibers on the wing plate due to longitudinal compression, and the wing plate plane is leveled, as shown in the picture a b.<\/li><\/ul>\n\n\n\n

                                      If there is a partial depression on the wing plate, you can lay the wing plate flat, place the deformed wing plate on the platform, and hammer the concave-convex surface with a sledgehammer to directly eliminate the local convex deformation (as shown in picture c), for the partial depression of the wing plate inward, because the sledgehammer is not convenient for direct force application, try to use a top iron or other longer tools to accept the force between the deformed protrusions and level it.<\/p>\n\n\n\n

                                      \"\"
                                      Correction of channel steel wing plate deformation<\/figcaption><\/figure><\/div>\n\n\n\n

                                      2. Precautions for channel steel straightening operation: The channel steel section is composed of a wider web and two wing plates symmetrically distributed relative to the web. The correction of vertical bending deformation lies in the correction of the vertical bending of the web, and the correction of lateral bending deformation lies in the correction of the vertical bending of the two wing plates. The unequal vertical bending deformation of the two wing plates causes the distortion of the channel steel. Therefore, the analysis of any deformation of the channel steel and the selection of the correction scheme should be based on this point.<\/p>\n\n\n\n

                                      Since the width of the channel steel wing plate is much smaller than the width of the web, the channel steel is prone to side bending deformation due to its small bending stiffness in the width direction of the wing plate. At the same time, due to its low rigidity, the side bending deformation is the more important part of the channel steel deformation. Deformation that is easy to correct. For any more complicated channel steel deformation, the deformation correction sequence is twisted \u2192 vertical bending\u2192 side bending.<\/p>\n\n\n\n

                                      When correcting channel steel, you should also pay attention to: due to the small thickness of the outer edge of the wing plate, the strength of the two right-angled edges is weak. When hammering and correcting along the parallel direction of the plate surface, the flange edge is caused by the small contact area. Partial damage to the edges and edges. Therefore, when applying force to the two parts, it is best to pad atop iron of a certain width or a suitable type hammer so that the two parts do not directly contact the hammer so that the force is evenly distributed, so as to reduce the extrusion stress and avoid Leave a hammer mark. It is forbidden to directly hit the force-bearing place with a hammer.<\/p>\n\n\n\n

                                      Corrective Operation of Frame-Shaped Components<\/strong><\/h4>\n\n\n\n

                                      Frame-shaped parts with certain mechanical properties in a certain plane made of thin sheet materials are called frame-plate components. According to the shape, the frame and plate components can be divided into strips, rings, and bulkheads. The main components of frame plate components are web and edge plates. Due to the different forming methods of different frame members, especially the forming methods of the edge plates, the material fibers are inconsistent in elongation and contraction, which results in different deformations of various frame members. For example, the curvature of the strip frame, the unevenness, and distortion of the web plane, the rebound of the edge plate angle, etc.; the web warpage of the ring frame plate and the rebound of the edge plate angle; the bulkhead (or Large-scale frame plate) The frame plate web is not flat: distortion and inaccuracies in the shape of the edge plate are deformed.<\/p>\n\n\n\n

                                      1. Corrective operation of frame and plate components: Frame plate components are thin-plate moldings. Because they are made of thin plates, their local rigidity is small. Generally, the local deformation of frame plate components can directly correct the deformation; but for some other large deformations, they cannot be isolated. To deal with it, we must conduct a comprehensive analysis of the parts associated with it to find the reasons.<\/p>\n\n\n\n

                                      • Corrective operation of bar-shaped frame components. The picture below shows the deformation and correction of the bar-shaped frame. When the strip frame has a large curvature (that is, the arc radius is too small) deformation (as shown in the picture a), the correction method is to stick the web of the strip frame on the platform and use a certain width-to-thickness ratio The slats are evenly platooned along the inner edge of the frame plate, so that the fibers near the inner edge line are elongated and the curvature is reduced.<\/li><\/ul>\n\n\n\n
                                        \"\"
                                        Rectification of strip frame and board components<\/figcaption><\/figure><\/div>\n\n\n\n

                                        When the strip frame plate is deformed with smaller curvature (larger radius of circular arc) (see picture b), the correction method is to put the web of the strip frame plate on the platform and use the same strip plate as before to uniformly strike along the curved edge line of the outer edge of the frame plate, so as to elongate the fibers near the outer edge line and increase its curvature.<\/p>\n\n\n\n

                                        When the strip frame plate has local unevenly suspended deformation on the web plane (see picture c), boxboard should be posted on the web platform, and on both ends of the deformation zone of local dangling the mat a sheet, with a width less than the block within a block box plate width pad on the deformation area, the above block on either side of the two edges close to the frame plate, with a hammer to knock, so that the two convex flanges flattening, then removed two thin plates, is still in the original block and hammer, the web of the uneven area To eliminate.<\/p>\n\n\n\n

                                        When the end of the web of the strip frame plate is warped, resulting in uneven deformation of the webs(see pictured), the inner pad of the two edges of the strip frame plate can be placed on a pad of iron and hammered evenly along the edges of the two edges to cause elongation deformation of the edge fiber, thus correcting the web plane.<\/p>\n\n\n\n

                                        When the strip frame plate has the same bending Angle as elastic deformation (see picture e), a hammer can be used to directly tap the Angle to increase the edge of the deformation, or a pad can be used to cling to the curved line of the frame plate, and a hammer can be used to hit the outer edge of the two edges or the root of the curved line of the two edges to make the two edges of the deformation cling to the pad, so as to obtain the effect of Angle correction.<\/p>\n\n\n\n

                                        • Corrective operation of annular frame plate type components. As the edge plate of the annular frame plate is a closed thin plate perpendicular to the web, it and the web form a thin plate structure with greater stiffness, and the deformation and stress distribution of one part of the annular frame plate will certainly affect the stress distribution of the other part and even produce deformation<\/li><\/ul>\n\n\n\n

                                          When the web of the annular frame plate has warpage and uneven deformation (see the picture a), the web plate on the left and right side up, using the correct method is: will ring frame plate notch down, become warped on both sides of the division in on both sides of the edge of the platform, with his left hand to the left side of the ring plate on the platform and will be with the right hand the right side of the ring frame plate down, make its flange bending deformation, then the web is flattening, will ring box board notched up again, with a web platform, such as shown in picture b, hammer the top block along the inner edge of the curved line (mainly the joint of the left and right sides), Purpose is to eliminate shearing stress and tensile stress, increasing the compressive stress near the curved line. When the web is so correct, deal with a flange around half attaches to the appropriate correction, and deformation of the part after making a correction to minimize the residual tensile stress. When the ring frame plate inside and outside the ring over the shape of the deformation, the available log section of the clamp on the vise, hang the component is less than the appearance in a log, Hit the corresponding position of deformation with a hammer to make the shape meet the requirements, as shown in picture (c).<\/p>\n\n\n\n

                                          \"\"
                                          Deformation and correction of ring frame plate<\/figcaption><\/figure><\/div>\n\n\n\n
                                          • Corrective operation of large frame parts. The picture is a large frame plate (also known as a septum). From its structure, there are flanged edge plates, strengthening holes, and strengthening holes to enhance plane stiffness (also known as locally formed structures). In addition, there are structural required gaps on the edge plates and sag structures to avoid the space of connected parts. For this kind of complex structure, the heat treatment bureau will inevitably produce various warpage and uneven deformation, such as the common notch bending edge relaxation and expansion, strengthening the socket to reduce the hole contraction and tension, the slack around the flat hole, the plane distortion, the curvature of the concave bending edge, etc.<\/li><\/ul>\n\n\n\n

                                            The corrective process of large frame plates is as follows: put the deformed components (see picture a) after heat treatment on the mold, and then pump the flat part of the web with a rubber strip to make it roughly stick to the template. Knock row with a non-ferrous metal hammer or hardwood hammer to strengthen the nest, reduce the root around the hole, in order not to hammer these structures, can be cushioned with a knocking block. The purpose of percussion is to eliminate tensile stress and increase compressive stress. The member is then turned over and placed on another die (see picture b), a non-ferrous metal hammer or hardwood hammer exhibition lightening hole, strengthen the nest around the roots, or strike with a non-ferrous metal block. These parts with a rubber strip evenly whipped web plane to level off, if discover the web has encouraged the distortion, should press tablet to rule out a correct method. Because the flanging forming concave flanging in elongation of the material deformation is the largest, therefore, then component as shown in the picture a place it on the mold, hammer the concave edges evenly with a hammer to relax the material until it meets the shape template.<\/p>\n\n\n\n

                                            \"\"
                                            Correction of large frame plate<\/figcaption><\/figure><\/div>\n\n\n\n

                                            2. Precautions for the corrective operation of frame and plate components: The main structural elements of the frame plate are membrane plate and edge plate. No matter what local structure there is on the web, such as a flat hole, strengthening hole, flat part forming, at least one side of the plane of the web is flat. The flange plate is always perpendicular to the web plane, regardless of any notches or locally formed structures in the flange plate. Therefore, any correction of deformation must be carried out on the platform. For more complex large frame plate, the template should be used to correct, so that the correction of the component and the correct shape is close to, correction is strictly prohibited, otherwise, too much ineffective correction will aggravate the deformation of the component, creating difficult to clean up the distortion. When the simple frame plate is corrected, the web should be stuck with the platform surface all the time. The hammer of the web and the curved line fiber should be placed with the platform as the solid pad. When knocking, the part must be padded solid, and it is forbidden to knock empty.<\/p>\n\n\n\n

                                            In the correction of the large plane, the flat side should be stuck to the mold or platform, not facing up, so as to facilitate the pumping and leveling of the rubber strip. At the same time, the corrected part of the web should be stuck to the molding plane, and should not be suspended, so as to facilitate the hammering and hammering of the rubber strip, or to avoid the production of new sag under the pumping and patting of the rubber strip. When the area of the knocked part is not large or the requirements are more accurate, the top block can be aligned with the knocked area.<\/p>\n\n\n\n

                                            For the large-area warping deformation of the frame plate, torque can be applied to the direction of reverse deformation to reduce the original deformation degree, and then the hammer method can be used for careful correction until it meets the requirements of the drawing.<\/p>\n\n\n\n

                                            In order to ensure the surface quality of the frame plate and the accuracy of the shape, do not use the hammer or pad of hard material to contact the surface of the workpiece directly, to avoid producing marks; The correction of the joint between the web and the frame edge, which is not easy to apply external force, must use the material with the same shape, the softer pad or appliance to indirectly transfer force at the correction place, to avoid the inaccuracy of the application of force and the mutual interference of various parts and destroy the correction effect.<\/p>","protected":false},"excerpt":{"rendered":"

                                            Eliminate the deformation processing of rice gold components are collectively referred to as correction, manual correction and mechanical correction of<\/p>","protected":false},"author":3,"featured_media":1856,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1],"tags":[826,828,827],"class_list":["post-1585","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-shearing-machine","tag-manual-correction","tag-precautions-for-corrective-operation","tag-sheet-material"],"jetpack_featured_media_url":"https:\/\/www.hecter.cn\/wp-content\/uploads\/2021\/04\/\u6dfb\u52a0\u6807\u9898-2.jpg","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/posts\/1585","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/comments?post=1585"}],"version-history":[{"count":0,"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/posts\/1585\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/media\/1856"}],"wp:attachment":[{"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/media?parent=1585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/categories?post=1585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hecter.cn\/th\/wp-json\/wp\/v2\/tags?post=1585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}