For sheet metal stamping parts, usually in the case of mass production, the process concentration plan should be adopted as much as possible, and the composite or progressive die should be used for stamping, so as to improve productivity and achieve safe production. However, for small batch production, it is advisable to use a single-process mold and a stamping method with dispersed processes. Practical experience shows that for compound molds, the number of processes concentrated on a pair of molds should not be too many, generally 2 to 3 processes, with a maximum of four processes. For progressive molds, the number of concentrated processes can be more because of the mold The degree of freedom of the layout of the structure is much greater than that of the former.
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