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在车床上加工外圆时,根据工件的形状、大小和数量的不同,可采用的安装方法也不同。对于较长的或必须经过多次装夹才能加工好的工件,如长轴、长丝杠等的车削,为了保证每次装夹时的安装精度,可用两顶尖来安装。在两顶尖上车削工件的优点是,定位正确可靠、装夹迅速方便、安装精度高。因此,它是车削加工广泛采用的方法之一。 在车床上加工外圆转速较高,为了避免后顶针与工件之间的摩擦而发热过多将中心孔或顶尖“烧坏”,目前大都采用活顶针,以活顶针内部的滚动摩擦代替顶针与工件中心孔的滑动摩
When machining a circle on a lathe, the mounting method that can be adopted varies depending on the shape, size and number of the workpieces. For long or have to go through multiple clamping can be processed workpiece, such as the long axis, long screw and other turning, in order to ensure the installation accuracy of each clamping, can be used to install the two top. The advantage of turning the workpiece on both tops is that the positioning is correct, the clamping is quick and easy, and the mounting precision is high. Therefore, it is one of the widely used methods of turning. In the lathe processing high outer circle speed, in order to avoid friction between the rear thimble and the workpiece and excessive heat will center hole or the top “burn out”, at present most of the live thimble to live thimble internal friction instead of thimble Sliding friction of workpiece center hole