The manufacturing method of the precision punching die: the gap between the convex and concave die of the precision punching die is extremely small, generally 1% of the material thickness, so the difficulty in manufacturing the die is relatively large. Until the early 1970s, the manufacture of male and female dies was still carried out by fitting a semi-finished punch onto the mold and embossing it with a hardened die mounted on the mold. The punch is machined according to the imprint and quenched. Such a compounding process has a large amount of manual labor, and the punching and quenching deformation often causes unevenness in the gap, increases the repairing workload, and even causes waste.
The manufacture of precision punching molds in the industrialized countries of the world has basically got rid of the matching process, mainly adopting the following several methods:
(1) CAM, CNC wire cutting uses computer-aided manufacturing.
(2) CAM, optical curve grinding using computer-aided manufacturing.
(3) Computer continuous trajectory CNC coordinate grinding is the advanced technology of finishing fine dies.
The fine punching die, punch, crimping ring, top plate and the like processed by the above three processes can meet the requirements of interchangeability.