一方向CFRPのドリル加工における工具刃数と切削力特性

抄録

3 flutes twist drills have recently been used to metal cutting in terms of accuracy of drilled holes. The paper discusses the cutting processes of 2 and 3 flutes drills in drilling of uniaxial carbon fiber reinforced plastic (CFRP). The cutting force depends on the relative angle of the cutting direction with respect to the fiber orientation of workpiece. The changes in the cutting forces with the cutter rotation are analyzed in the cutting force measurement and the cutting simulation based on a force model, where the orthogonal cutting data for the simulation changes with the relative angle of the cutting direction to the fiber orientation. The averages and the periodical amplitudes in the cutting forces are discussed for drilling of 2 and 3 flutes tools. Large cyclic changes in thrust and torque appear in drilling with 2 flutes drill. X and Y components, in contrast, change periodically in drilling with 3 flutes drill.