With the continuous development of automobile repair technology, the research on repair techniques of automobile body sheet metal parts is also carried out continuously, and the repair effect of automobile body sheet metal parts is continuously improved. In the process of studying the repair techniques of automobile body sheet metal parts, the focus is to start with the damage manifestations of the automobile body and sheet metal parts, and analyze the targeted repair methods adopted for different damage or deformation of the automobile body sheet metal parts. The following is an analysis of different auto body sheet metal repair techniques.

Repair skills of automobile sheet metal parts

At present, the reasons for the maintenance of sheet metal parts in most cars in my country can be summarized as the repair of bending, tearing and wrinkling. For different repair situations, there are certain differences in the analysis of the repair techniques. Most of the repair needs of automobile sheet metal parts are caused by the extrusion and impact of external forces.

bend repair

The bending repair technique of automobile sheet metal parts is applied when the automobile is extruded or impacted by external force, so that the extruded or impacted part may cause a certain area of serious damage; and it needs to be inspected or with the help of professional testing tools. Accurate measurement of deformation area, damage and other data.

In the repairing process, the damage part is mainly repaired by using the bracing method, and the bending of the automobile body sheet metal is repaired by exerting the reverse force in the bracing direction. However, in the process of using the bracing method, attention should be paid to the application of gap pads to reduce the damage to the car body caused by the repairing behavior.

tear repair

For the tear repair of automobile sheet metal parts, in most cases, the consequences of sheet metal dislocation may occur, and in severe cases, it may cause sheet metal shortage, that is, sheet material loss. When repairing, it needs to go through two steps: first straightening and then welding. The straightening operation is the pre-treatment of the damaged parts of the automobile sheet metal parts, and then the repair of the damaged parts is completed by means of oxygen welding. However, during this process, the use of modern new welding equipment CO2 gas welding will make the welding joint of the damaged part smoother.

If there is ductile protrusion at the weld joint, a new type of concave-convex damage repair method is required to repair the position of the weld joint. When dealing with more serious tear damage, the repair work of automobile sheet metal parts can be completed by digging or replacing new parts.

Wrinkle Repair

The wrinkle repair of automobile sheet metal parts is mainly to repair the wrinkle or concave-convex damage of the damage position with elastic deformation or plastic deformation. Judging the form of wrinkle damage in automobile sheet metal parts is the basis for choosing an appropriate repair method. For concave-convex damage, modern equipment body repair meson machines can be used to repair, combined with hammering or pulling methods to repair the damaged parts.

A common way to repair minor bumps is to use a shim pad at the lowest position of the recess on the reverse side to repair the damage by hammering it multiple times; for severe bump damage, it is to use a pad on the back of the recess. way, pull it back up. Since the recovery of tension requires more tension support, it is possible to heat the concave position in advance, pay attention to the consequences of ejection in time, and analyze the rebound phenomenon, so that the concave-convex damage can be completely repaired.

As for the wrinkle damage, the wrinkle position of the automobile sheet metal parts is further stretched through the action of the opposite external force to realize the transformation of wrinkle damage and concave-convex damage, and then the corresponding meson machine shrinkage fire repair method is used for repair.

Repair method of car fender

In addition to analyzing the failure types of automobile sheet metal parts and adopting appropriate repair techniques, the repair of automobile body sheet metal parts also includes repair methods for fenders. In the repair method of automobile fender, it is mainly divided into different repair methods such as welding repair, shaping, correction and digging. The application focus of different restoration methods is shown in Figure 1.

In the repair method of welding repair, with the help of carbon dioxide gas shielded gas welding, the appropriate welding method is selected by judging the length of the weld at different positions. When the weld is short, it can be welded from the periphery of the damage and gradually inward; when the weld crack is long, it is fixed by spot welding, and the welding is completed in sections and positions. However, in this process, it is also necessary to pay attention to the control of the weld temperature to avoid warping and deformation of the layout.

And when there is a large force on the weld, you can choose the method of welding on both sides and increase the strength of the welding. At the same time, if the back of the crack is connected, the thick plate on the back can be heated first, so as to complete the welding of the weld and the thick plate on the outside; In the case of joints, the welding work can be completed by welding the welds at both ends first, and then processing the thick plate on the back. Finally, when repairing sheet metal parts, it is also necessary to eliminate the residual stress generated by welding to ensure the flatness and smoothness of the weld.

In terms of plastic repair, it mainly deals with the trimming operation after the repair is completed. By using the method of hammering after welding, an anvil iron of suitable shape can be placed on the opposite side of the hammering, and the plastic repair work can be completed by extending outward from the raised position. When there is a large pit area, you can use a wooden hammer to further restore the original shape, and finally use a hand hammer to repair it.

In terms of correction and repair, it is mainly aimed at the repair method adopted for the bending or elongation of a certain part of the car fender when the car is damaged by impact. Generally, the two ends are fixed with a tensioner, and the length of the deformed part at the center is changed and manipulated; combined with the heating operation of gas welding, the stretching and shrinking process is completed as soon as possible. During this process, if a larger deformation position is caused, it can be dealt with by hammering or shim iron.

The use of cutout repair is a repair operation in the case of severe impact damage or corrosion damage to the car. The main purpose of using the method of excavation and repair is to restore its original shape. The main repair steps can be summarized as: determination of the scope of excavation and repair, replacement and treatment of the model, positioning and welding of the new plate, leveling and reinforcement operations, etc., and finally realize Effective processing of automotive body sheet metal parts.

Car door repair skills

The repair technique of analyzing the car door is mainly to correct and repair the car door when the door frame is twisted or the door frame is deformed and other damages. For the damage repair of the deformation or distortion of the car door frame, the replacement and treatment of the door panel are the main repairs.