There are many reasons for bending and twisting caused by external impact or extrusion, and the common one is the damage caused by accident. Generally speaking, bending and twisting deformation near the center of impact or extrusion is severe and easy to detect. The slight deformation depends on the detection tool and the comparison with the design dimensional data to determine the degree of deformation. Sometimes it can also be judged by observing the relative position of the adjacent parts of the automobile sheet metal parts.
The deformation of the body frame, beam and column can be corrected by the support-pull method, and the direction of the support-pull force should be opposite to the direction of the deformation force. For example, the right front corner of the roof collapses after being hit, resulting in deformation of the right door frame and the right front corner of the windshield frame, and the door cannot be closed. Use the top supporter between the upper right corner and the lower left corner of the door frame, and rotate the handle to extend the screws at both ends. With the extension of the top supporter screw, the upper right corner of the roof gradually rises, the wind window frame is also reset accordingly, and the door frame can also be gradually restored. Another example is that the left side of the car is hit and the center column between the two doors on the left side is concave. At this time, a manual hoist can be used, one end is fixed on the damaged center column, and the other end is fixed on a solid column and wall, and the guide chain is pulled to make The chain is shortened, and the depression of the central column will gradually reset.
When calibrating the body frame, beam and column by the stretch method, a pad should be placed at the contact point between the body sheet metal parts and the stretch tool to avoid new damage.
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