ポリカーボネートを用いたドリルの増減送り加工機構の検討

概要

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At present in strictly economic and environmental situations, the improvement of production efficiency and environmental bad influence is the actual subject in a drilling process. In this study, in order to solve the cutting mechanism during intermittently decelerated feed drilling with polycarbonate was investigated and the relation among the cutting force (thrust, torque), chip shape and breaking stress of chip etc. was discussed. The main results are as follows. (1) The torque force in case of intermittently decelerated feed drilling (F_f=2,3,4) nearly equal in comparison with conventional drilling (F_f=1) and the changed range of this torque varies approximately 20% because of a dynamic component due to the periodic fluctuation of the applied feed. (2) The thrust force in case of intermittently decelerated feed drilling (F_f=2,3,4) increases approximately 50% in comparison with conventional drilling(F_f=1) and the changed range of this thrust varies approximately 50〜60% than that of F_f=1. (3) The change of chip thickness is not a rectangle, it is chevron. On intermittently decelerated feed drilling, there was a chip of the folded condition on the slow feed part. (4) In breaking test of the chip, the breaking power is lowered of intermittently decelerated feed drilling further than conventional drilling. The breaking position is different by intermittently decelerated feed ratio.