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以前使用焊有硬质合金的60°圆锥体(见图1)研中心孔。这种圆锥体没有刃口,只能研磨中心孔的大部分锥面,而中心孔在粗加工中所损伤的锥面部分却研磨不到,总之不能满足锥面的粗糙度和几何精度的要求。现使用改进后的中心孔研铰划钻(见图2、3)两有刃口,可进行少量切削,并有0.05～O.2mm的圆锥面起研磨作用,因此,能够修整中心孔锥面的几何形状误差和降低表面粗糙度。改进后的研铰划钻与中心孔锥面接触的时间短,所以工具的寿命长,加工效
The center hole was previously machined using a 60 ° cone welded carbide (see Figure 1). This cone has no cutting edge and can only grind most of the conical surface of the center hole. However, the conical surface portion damaged by the center hole in the roughing process can not be grinded. In short, the conical surface roughness and geometric precision can not be satisfied . Now use the improved center hole Hinge drilling (see Figure 2, 3) have two cutting edge, can be a small amount of cutting, and 0.05 ~ O.2mm cone from the grinding effect, therefore, to be able to trim the center hole taper Geometric error and reduced surface roughness. The improved research hinges drills and the center hole conical surface contact time is short, so the tool’s long life, processing efficiency