超砥粒による単粒二次元切削(第1報)

Abstract

In this paper, single-grit orthogonal cutting has been performed on a carbon steel with shaped CBN and diamond grains to understand the difference in surface quality and grinding force between CBN and diamond wheels. The cutting and thrust forces were measured by means of load washer under different negative rake angles, cutting speeds, and depths of cut. In each cutting condition, the thrust and cutting forces increased linearly with increasing cross sectional area of groove. Forces with diamond grains were greater in almost cases than the cutting with CBN grains, and much influenced by cutting condition. On the other hand, no significant influence except for rake angle was seen in forces in cutting with CBN grain. Furthermore, the friction angles under each cutting condition was calculated to detect the deformation condition in front of rake face at chip formation. It changed largely with grain type, rake angle and cutting speed. There was a quite difference between diamond and CBN grains. The reason for the difference would be the difference in coefficient of friction of two grain types.