直齿轮闭挤式精冲模具的失效分析

摘要

Objective To understand the failure of the mould in closed-extruding fine blanking and to find effective methods to prevent failure. Methods The main failure form of the mould was analyzed according to the loading features. Experiments, tests and metallographic analysis were carried out to study the main principle of mould failure. Results Some effective ways to prevent mould failure and to prolong the service life of the mould were summarized. Conclusion The fail-ure of punch and main-die in closed-extruding fine blanking process mainly occurred at the cutting edge. Improving the mould structure and optimizing process parameters could reduce the mould stress, and meanwhile selecting superior mould material could also reduce failure.%目的：探索闭挤式精冲模具的失效情况及有效的防止措施。方法根据模具的受力特点，分析了闭挤式精冲模具的主要失效形式。通过实验、检测和金相分析，研究了模具失效的主要原理。结果总结出了防止模具失效、延长模具使用寿命的一些有效方法。结论闭挤式精冲凸模和主凹模失效主要发生在模具刃口处，改进模具结构，优化工艺参数，能减小模具受力，同时选择优质的模具材料也能减少失效。