从设计、工艺、制造、使用等方面概述精冲模芯的改进措施及延寿方法。
It summarizes how to take measures and improve methods to extend the lifetime of Fine Die from the aspects of its design, techniques, machining and using.
航线使用中如有50%以上发动机实际使用寿命超过平均翻修寿命，发动机就可以延寿，给出了延寿估算方法。
If the 50% actual operating time of aircraft engine is greater than the mean TBO in airline operation, the TBO can be prolonged. The method for estimating the prolonged life is also given.
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