圧縮残留応力生成工具による加工表面層の残留応力制御

概要

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The purpose of this study is to control the residual stress within a machined surface layer of aluminum alloy by a newly developed cutter. The developed cutter has cutting edges for material removal and a projection pin for a burnishing-like process. The effect of the machining conditions such as cross feed width, pin protruding length and feed rate on the residual stress within the machined surface layer was investigated. As a result, all kinds of cutting conditions conducted in this study can generate sufficient compressive residual stress within the machined surface. It was shown that the generated residual stress is most sensitive to the cross feed width. As the cross feed width becomes small, the compressive residual stress increases. It was also shown that the pin protruding length has the possibility to control the residual stress level, but its effect is smaller than that by the cross feed width. On the other hand, it was shown that the feed rate doesn't affect the residual stress state. In addition to the compressive residual stress, as the surface hardness within the machined surface layer also increases largely, it is expected that the fatigue strength and the resistance to stress corrosion cracking of the machined parts will be improved by using this tool.
公益社団法人精密工学会の論文
2005-04-05