Wrinkles and concavities and convexities caused by impact or extrusion by external force, such as minor damage and no extension of the metal, belong to elastic deformation. The heavier, the metal will expand, which is a plastic deformation. Tearing occurs when the impact or crush is particularly severe. The exposed parts of the body sheet metal parts may have wrinkles and concave-convex damage.
Convex trimming:
For the repair of convex surfaces with large curvature, see that for concave-convex damage, hammering method or top-pulling method can be used to repair. For minor concave-convex damage, the pad iron can be placed on the back of the lower part of the recess, hit with a hammer, and the position of the pad iron can be changed accordingly.
When the convex part is basically knocked flat, the concave part will mostly recover due to the reaction force of the horn. Then observe the overall smoothness of the board surface, and make some subtle trimmings in a targeted manner to repair the concave and convex damage.
Larger depressions:
You can use a backing plate to cushion the back of the depression, and directly lift it up with a jacking tool.
In order to reduce the jacking force, if necessary, the concave part can be heated to dark red. Rebound should be considered when ejecting, which can make it “overkill”. If there are large ductile protrusions on the surface, the metal at the extension can be properly shrunk. If it is difficult to put the horn in the damaged part, drill holes in the concave part with as few holes as possible and the hole diameter as small as possible, then fold it into a hook shape with iron wire, fasten it from the hole, and then apply external force to stretch it until it meets the requirements. When required, pull out the wire, weld the hole, and grind it flat.
Wrinkle damage repair
For fold damage, an external force (opposite to the impact force) can be applied to the fold to transform the unfolding of the fold into concave-convex damage. Then use the concave-convex damage repair method to repair. A manual hoist can be used as a repair tool for automobile sheet metal parts. One end is fixed at the fold of the sheet metal part, and the other end is fixed on a solid column and wall. The guide chain is tightened, and the folds are gradually unfolded. The degree of extension should be observed at any time to avoid tearing.
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