1. When the body is partially reshaped, the damaged part can be put into the formwork, and the body surface can be repaired with the sheet metal formwork. There are two plastic methods using sheet metal formwork support: positive support method and partial support method. The positive supporting method is to directly place the sheet metal supporting die on the convex part on 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 bulges and flattening smaller bulges. However, the forward support method is easy to cause the extension deformation of the metal plate, and the metal in the hammering part will become thinner and the area will increase.

many parts of the automobile body structure can't be put into the formwork, and some parts can be repaired with the help of a leveling knife. 4. When operating, attach the leveling knife to the back of the deformed part, and strike the deformed part with a sheet metal hammer. This method is especially effective for the restoration of tiny bumps and scratches on the car body surface.

the trowel can also play a supporting role in the shaping process, for example, it is very effective in repairing the local deformation of the car door without damage to the internal structure of the car body component. First, pry and reshape with a leveling knife, and then bounce the protruding pry back to the normal position. Then, according to the method shown in Figure 4(b), repair and level the door panel with the help of a leveling knife and a sheet metal hammer. During operation, the hammering force should be controlled, and the position of the supporting point of the leveling knife and the hammering force and position should cooperate with each other. If the hammering force is greater than the top contact force of the leveling knife, the leveling purpose will not be achieved, and even the deformation of the parts will be aggravated. Generally, the top sticking force of the leveling knife can be slightly greater than the hammering force, so the effect will be better. The operation should follow the principle of "knocking high and knocking low", and pay attention to adjusting the position of vertex and hammer point at any time. Continuous knocking at a point or too much force and too many times will inevitably extend the metal plate surface and cause the plate-like components to warp.