- 著者
-
佐藤 悌介
高木 直温
- 出版者
- 公益社団法人 精密工学会
- 雑誌
- 精密機械 (ISSN:03743543)
- 巻号頁・発行日
- vol.35, no.409, pp.74-80, 1969-02-05 (Released:2009-06-30)
- 参考文献数
- 10
- 被引用文献数
-
1
Recently, high energy rate forging has been developed.In a high speed stamp forging, the indentation velocity reaches to the range of several decades or 100m/s.High speed indentation involves numerous interesting problems from the view points of plasticity, metal physics and metallurgy. The high speed indentation for mild steel test piece has been investigated using cylindroconical punches with several cone angles.High speed was obtained by firing the gun powder.This paper deals with the comparisons on the velocity, resistance and microstructure in both cases of dynamic and static indentations. The results obtained are as follows.1) High speed indentation gets deeper depth than that of static one.2) The zone of the microstructure deformed by the high speed indentation is smaller than obtained in the static case.3) Mechanical twins are observed in the case of high speed indentation.4) The coefficient of friction in the high speed indentation seems to be smaller than that of static one.