Transactions of Materials and Heat Treatment

Title：Analysis of familiar defects of low-temperature forging on operating instruments

Authors： DONG Jia-kun YE Xun SUN Bin(Operating Instrument Factory Shanghai Medical Instrument Group Co.Ltd. Shanghai 200072 China)

Unit：

KeyWords： operating instrument low-temperature forging forging defect

ClassificationCode：TG316

year,vol(issue):pagenumber：2005,30(6):15-17

Abstract：

Forging defects of mould cavity non-saturate,crack,pucker and shearing edge avulsion,etc.on the astrictive clamps and operating scissors are studied by means of appearance and metallography.The results show that bad low-temperature flowing capability of steel and no tempering at high-temperature after forging cause the forging defects.Flowing capability of steel should be increased by means of increasing forging temperature to avoiding mould cavity non-saturate,crack and pucker.Shearing edge avulsion can be removed by means of tempering at high-temperature after forging.Selecting suitable mould material to reduce the forging stress can increase the mould service life.

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Reference：

[1]《理化检验》编辑部.金相检验[M].上海:机械工业部上海材料研究所,1983.
[2]王笑天.金属材料学[M].北京:机械工业出版社,1987.

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