INNER DIAMETER FINISHING METHOD AND REAMER

摘要

An improved inner diameter finishing method and an improved reamer for a plurality of holes disposed in series, wherein a tip end small diameter part (94) and a guide part (130) are provided in a body (128) of a reamer (16), a chip (156) having a main cut blade and an auxiliary cut blade (166) is fixed to the tip end small diameter part (94), and the turning radius of the auxiliary cut blade (166) is made larger than that of each land of the tip end small diameter part (94) and smaller than that of each land of the guide part (130), after the inner peripheral surface of a cam shaft hole (172) is cut, the reamer (16) is moved forward and a camshaft hole (174) is cut with the guide part (130) press-fitted into the camshaft hole (172) when the camshaft holes (172 to 176) are to be finished, and the camshaft hole (176) is finished with the guide part (130) press-fitted into the camshaft holes (172, 174), whereby the concentricity and dimensional accuracy of the camshaft holes (172 to 176) are increased.