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本文对表盘冷冲压模具使用时过早开裂报废的问题用常规金相方法进行了综合分析，确诊了模具寿命不高的主要原因在于其内应力的不合理分布，从而提出了采用预应力模具的有效措施，大幅度地提高了模具的使用寿命。
In this paper, a comprehensive analysis of the problem of premature rupture of the dial when used in the cold stamping die was carried out by the conventional metallographic method. The main reason for the low life of the die was confirmed by the unreasonable distribution of the internal stress. Thus, Effective measures to substantially improve the service life of the mold.