切削加工後のWC-Co超硬工具表面に現れる自発磁化測定(機械要素,潤滑,設計,生産加工,生産システムなど)

概要

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Spontaneous magnetization of a WC-Co cemented carbide tool was measured before and after machining to evaluate the stress distribution on the ferromagnetic Co binder. After machining the pre-demagnetized tool, residual magnetic density flux, perpendicular to the flank and cutting surface, were observed. Because of the negative magnetostrictive coefficient of Co, the magnetic-flux direction indicates the residual stress from the spring back of plastic deformation during machining, The observed spontaneous magnetization can be explained from an asymptotic approach to the ferromagnetic anhysteresis curve under external stress. This method can be applied for the evaluation of residual stress on cemented carbide cutting tools.
社団法人日本機械学会の論文
2010-02-25