Correction and repair methods for impact damage of stamping parts of automobile body

2022-08-16 08:52:18

The repair of impact damage of automobile stamping body is mainly accident wound repair, and the commonly used methods are shrinkage shaping, wrinkle unfolding, bracing and pulling and pad pry reduction.

1. Shrink shaping

In order to restore the deformed part to its original shape, it is necessary to find a way to shrink the extended part. The shrinkage shaping process is as follows:

1) Use the torch flame to heat the stretching center to a reddish color, but be careful not to melt or burn through the plate.

2) After heating, rapidly knock around the red area and gradually shrink to the center of the heating spot, forcing the metal structure to shrink.

3) If only one part can not achieve the purpose of shaping, the same method can be used to make multi-point contraction, and with each heating contraction, flattening correction shall be carried out.

4) In case of slight stretching, it is not necessary to knock after heating. Only cotton yarn dipped in cold water can be used for cooling, or it can be cooled naturally.

2. Fold unfolding

The collision of the vehicle body may cause irregular wrinkles of the stamped sheet metal. When repairing, if it is convenient and feasible, the vehicle can use the bracing and pulling method to remove the wrinkles and then flatten them; If it is not convenient or feasible, the vehicle body shall be disassembled and repaired under the vehicle. The key to opening pleats: first, try to pry the dead pleats from the inside to relieve the living pleats, then heat up and knock the ridges of the living pleats with a hammer to gradually unfold them and restore the original shape.

3. Tension reset

The hydraulic spreader pushes the plunger rod apart by the pressure generated by the hydraulic cylinder, so it can spread the deformed plate. In addition, there is a screw type brace and puller, and both ends of the lead screw are respectively provided with movable hooks. During use, if the steel pipe is stretched and shaped, the iron pipe can be rotated to shorten the lead screws at both ends at the same time. One end is fixed by the pull hook, and the other end is pulled by the pull hook to stretch the plate.

4. Reset the skid

Reset of pad skid is to make use of the effective space and support of adjacent parts according to the deformation position and degree of the vehicle, and carry out plastic repair based on the lever principle.

With this method, the vehicle body does not need to be disassembled, so the installation quality of the original vehicle is maintained and the work efficiency is improved, but the scope of use is limited. If the outer edge of the rear tire cover of the off-road vehicle is recessed, a wooden pad can be placed under the pry bar with the support of the tire to initially pry up the recessed part, and then use a hammer and sizing block to flatten the creases and bumps.