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1.使用寿命的标准球形立铣刀,由切削刃的形状可知,其螺旋形部分与外圆部分的切削作用是各不相同的。因此,它的后角在中心部分较小,随着向外圆周的靠近而逐渐增大。在进行大切深切削时,主要由外圆部分的磨损影响螺旋状切削刃的锋锐性;而在切深较小的切削中,则主要是中心部分的磨损影响该切削刃的锋锐性。因此,随着切削深度的不同,采用不同的使用寿命标准。在大切深切削时,外圆部分的后面磨损最大至0.2毫米(图1A),切深较小时,中心
1. Service life of the standard spherical end mill, the shape of the cutting edge we can see that the spiral part and the outer part of the cutting action is different. Therefore, its relief angle is smaller at the center and gradually increases as it approaches the outer circumference. In deep cutting, the sharpness of the helical cutting edge is mainly affected by the wear of the outer circular portion. In the cutting with the smaller depth of cut, the wear of the central portion mainly affects the sharpness of the cutting edge. Therefore, with the different depth of cut, using different life standards. In deep cutting, the wear on the back of the outer circumference is up to 0.2 mm (Figure 1A). When the depth of cut is small, the center