Punching technique for hypogynous metal bumper of heavy-duty car
A technology for heavy-duty vehicles and bumpers, applied in the field of auto parts stamping, can solve the problems of high mold maintenance costs, difficult forming, and cumbersome stamping process, so as to improve the product qualification rate, reduce the number of mold sets, and shorten the debugging cycle.
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[0018] The structure of the lower metal bumper of a heavy-duty vehicle is shown in Figure 1, with holes on the front and sides.
[0019] Because the lower metal bumper does not require high appearance quality, it is not necessary to adopt the usual deep-drawing process. The deep drawing process needs to add more process supplements, and the excess process waste will be repaired when trimming. According to the process of the present invention, the material is blanked first, then shaped, and finally trimming, punching, and side punching are performed to obtain the product shape. Specific steps are as follows:
[0020] (1) Blanking
[0021] First, the blanking process is carried out, and the block material is dropped and punched to obtain the expanded shape of the product as shown in Figure 2. Due to the complex expanded shape, the blanking adopts a closed blanking method. Adding process supplements during blanking, including the supplement of steel plate materials, and adding proces...
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