Active support and partial support refer to the use of shim. The so-called positive support means that the place where the iron pad is supported is the place where the sheet metal hammer is going to hit, and the partial support means that the place where it is supported is not the place where it is hit.

When the body is partially reshaped, the damaged part can be put into the template, and the body surface can be repaired with the sheet metal template. There are two plastic methods for using sheet metal formwork support: positive support method and local support method.

The front support method is to directly put the sheet metal support die on the convex part of the back of the sheet metal, and directly hammer the deformed part on the other side with a sheet metal hammer. This is very effective for repairing bumps and flattening smaller bumps. However, the front bracing method is easy to cause the extension and deformation of the metal plate, and the metal at the hammering position will become thinner and the area will increase.

Extended data:

Many parts of the automobile body structure can't be put into the template, and some parts can be repaired by leveling knife. 4. When operating, stick the leveling knife on the back of the deformed part and strike the deformed part with a sheet metal hammer. This method is particularly effective for repairing tiny bumps and scratches on the car body surface.

The trowel can also play an auxiliary role in the shaping process, for example, it is very effective in repairing the local deformation of the car door without damaging the internal structure of the car body parts. Use a leveling knife to pry for shaping first, and then bounce the protruding pry back to the normal position. Then, according to the method shown in Figure 4(b), the door panel is repaired and leveled with the help of leveling knife and sheet metal hammer.

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