Analysis of the precautions for pulling and restoring the sheet metal parts of the automobile body
When performing a stretch reset, the vehicle damage should be carefully observed and necessary tests should be carried out.
Deformation of the body, cab and engine compartment can be detected by diagonal measurement. According to the detection results, it can be determined which part is the main deformation part and the degree of its deformation; which part of the automobile sheet metal part is the secondary and auxiliary deformation part.
Due to the different positions and directions of the external force that the car bears during the collision, the force propagation in the car body is also different, and the resulting deformation is also different. According to the deformation characteristics and the degree of deformation, the tension part and the magnitude of the applied force can be selected.
For a local single small deformation, applying a force opposite to the original force direction on the key part can restore the deformation.
However, for a large area of the car body and multiple injuries, it is not suitable to use a little support. First, the plate may crack due to the excessive pulling force. Second, although the deformed part is temporarily corrected, the undeformed part will be affected by external force. deformation or internal residual stress. During the use of the vehicle, new deformation occurs due to the relaxation of internal stress. Therefore, special tools should be used for support and repair, and external force should be applied in multiple points, multiple directions, and primary and secondary, and reset while measuring to ensure that the undeformed part is not stressed. Timely heating and tapping, so that the deformation recovery is just right.
The surface of the door is partially concave, which can be supported by the window edge of the inner door panel through the crack (the glass lifting gap) on the lower edge of the door window, and the concave can be lifted with a pry tool. While the pad is prying, tap the sides of the depression with a hammer to remove the internal force and restore the original shape as quickly as possible. In order to ensure that the door is not damaged at the pry pad, a piece of rubber or wood can be placed at the fulcrum and the knocked part
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