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手表零件多以冷冲压成型,要求冲压件精度高,表面光洁度好,变形小。因此,对模具不仅要求有较高强度、硬度和耐磨性,同时还要求模具有足够的韧性。我厂使用的CrWMn钢冷冲模具,曾一度使用寿命较短,一般冲裁仅几千次,有的则在试模时就产生崩裂。为此,我们对手表冷冲模具进行了失效分析,并在此基础上探索了一种强韧化处理的新工艺,经4～5年来的生产实践证明,采用新工艺处理的模具,使用寿命普遍可提高3～4倍,同时还提高了手表零件的冲裁质量。
Watch parts and more cold stamping, stamping parts require high precision, good surface finish, small deformation. Therefore, the mold not only requires higher strength, hardness and wear resistance, but also requires the mold has sufficient toughness. CrWMn steel cold-stamping dies used by our factory used to have a short service life, usually only a few thousand times punching, while others were cracked during the test. To this end, we conducted a failure analysis of the watch die, and on this basis to explore a new toughening process, after 4 to 5 years of production practice has proved that the use of new technology to deal with the mold, the service life Can generally improve 3 to 4 times, while also improving the punching quality of the watch parts.