微細深穴加工におけるシンニングによって形成されるチゼルすくい角の影響

抄録

This study aimed to achieve the high-aspect-ratio microdrilling in L/D=20 by the reduction in cutting force. Effect of rake angle of a chisel edge by thinning on thrust force was examined. A strong correlation between rake angle of the chisel edge and the thrust force was obtained. The thinning of the microdrill with a diameter of 0.2mm resulted in a reduction in the thrust force by up to 70%. It has been found that optimal rake angle of the chisel edge in tool life was in the range from -10 to 0 degree. Furthermore, the rake angle of the chisel is able to be changed by changing the grinding wheel shape used for thinning.