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一般外圆磨削都采用锥面顶尖,这样,工件横截面中的形状精度与其本身中心孔位置精度、顶尖的位置精度有关。如果采用球面顶尖,由于消除了上述位置误差的影响,因此,能提高形状精度。球面顶尖结构如图所示,可分为整体式、组合式和装配式。整体式球面顶尖如图1-a,当球面半径R<10毫米时,采用I型;R≥10毫米时,采用Ⅱ型。
General cylindrical grinding cone tip, so that the shape of the workpiece cross-section accuracy and its own center hole position accuracy, the top position accuracy. With the spherical tip, the accuracy of the shape can be improved by eliminating the influence of the position error described above. Spherical top structure shown in the figure, can be divided into integrated, modular and assembly. Integral spherical tip as shown in Figure 1-a, when the spherical radius R <10 mm, the use of type I; R ≥ 10 mm, the use of type Ⅱ.