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Abstract：
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Based on the linear fracture mechanics principle, this article analyzes the factors that affect hammer lever life and finds reasons for hammer lever earlier failure and puts forward a method of choosing reasonably hammer lever material according to crack length so as to increase the hammer lever life.
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AuthorIntro：
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Reference：
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1 吉明(苏),王自新译锻锤北京:机械工业出版社,1957
2 王卫卫金属与塑料成形设备北京:机械工业出版社,1996
3 孙凤勤冲压与塑压设备北京:机械工业出版社,1997
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