砥粒切削過程の有限要素シミュレーション : 負のすくい角における切削状態の解析

概要

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A thermo-elastic-plastic finite element modeling of orthogonal cutting with a negative rake singlr-grit has been developed to understand the mechanics and thermal aspects of chip formation, which is the fundamental metal removal process of grinding. A stagnant chip material ahead of the tool tip, which is peculiar to the machining with a large negative rake, is introduced into the modeling to act like a built-up edge. This modeling coupled with temperature and strain-rate dependent flow stress characteristics of a work material SK-5 produces the serrated chips, which are usually observed experimentally under the cutting conditions of grinding region. There appear high and low temperature zones in turn according to severe and mild shear in the primary shear zone respectively. Simulations with and without a stagnant region show the importance of its role in the chip formation with a large negative rake. The shape of chip is affected by cutting speed and depth of cut; as Peclet number of deformation zone decreases with decreasing cutting speed or the depth of cut, serrated and long chips become difiicult to form.
公益社団法人精密工学会の論文
2000-09-05