Abstract
In cutting operation by a knife-edged cutter, horizontal motion paralleled to edge greatly decreases cutting force. This paper shows that friction at the tip of cutter by horizontal motion causes separation force in cutting plane, and verifies theoretically and experimentally. This deduction is verified by cutting test with Flat-blade cutter (Cutting edge is flatness.) and analysis of separating process .using FEM simulation method. The results obtained are as follows: (1) By cutting test using a special blade with Flat-blade cutter under several frictional conditions, it is supposed that horizontal friction causes large tensile stress at the vicinity of edge in cutting material vertical to the cutting cross section. (2) FEM calculation also shows that friction caused by horizontal motion makes cutting material be easily separated.
