在外圆磨床加工中,工件一般安装于锥顶尖上。在这一情况下,工件的圆度不仅取决于工件顶尖孔的相对位置精度,还取决于机床二顶尖间的相对位置精度。经验表明:采用上述常规的工件安装方式较难实现外圆的高精度磨削。为了克服上述工件定位方式所存在的缺点,近年来对球头顶尖进行了较多的试验研究表明,采用对工件中心孔及机床两顶尖间相对位置误差不敏感的球头顶尖,可以提高外圆磨削的精度。有些文献认为:采用钢球顶尖,不论锥孔圆度如何,也不论其中心线歪斜怎样,它总有几点与钢球表面接触,而且,从理论上说,圆球的任何截面都是圆,锥孔与钢球的接触圆周的圆 In the cylindrical grinding machine, the workpiece is generally mounted on the cone tip. In this case, the circularity of the workpiece depends not only on the accuracy of the relative position of the top hole of the workpiece, but also on the relative position accuracy between the two tops of the machine. Experience shows that: using the above conventional workpiece mounting method is difficult to achieve high precision cylindrical grinding. In order to overcome the shortcomings of the above workpiece positioning methods, in recent years the ball tip more experimental studies have shown that the use of the center hole on the workpiece and the machine tool is not sensitive to the relative position between the two ball tip tip is insensitive, can improve the outer circle Grinding accuracy. Some literature suggests that using a steel ball tip, regardless of its circularity, does not matter how its centerline is skewed, it has several points in total contact with the surface of the steel ball and, theoretically, any cross-section of the ball is a circle , Cone and steel ball contact the circumference of the circle