切りくずのカールと切れ刃に沿う切削速度差を伴う三次元切削機構の解析

Abstract

In previous papers an oblique cutting model taking account of up-curl of the chip and chip flow direction was proposed. In this paper, a cutting model also including side-curl of the chip and the cutting velocity difference along the cutting edge is developed. It is assumed that the deformation at any point on the cutting edge takes place as in oblique cutting model. The whole process of chip formation is treated as a combination of elemental oblique cutting models varying at each point on the cutting edge. On the basis of the cutting model the energy method is extended to predict cutting force components, radius of chip curl and others. From the numerical computation it is shown that the radius of side-curl of the chip easily changes from an infinite value in oblique cutting to a value of three or four times cutting width along the cutting edge in the case of large cutting velocity difference.