我厂工具车间,现有一台武汉机床厂70年12月出厂的M6420B滚刀磨。该机床在使用过程中经常出现分度失灵现象。现将对M6420B滚刀磨分度失灵故障的分析叙述如下:分度失灵的现象是闸齿与分度运动失调,闸齿动作提前或延迟均将使分度停止,从而破坏了半自动循环的继续进行。其液压原理图,如图1所示,其中分度液压操纵箱是用来控制工件主轴分度运动的,箱体内有上、下两滑阀,上滑阀“C”是用来使闸齿从分度盘槽内脱开和插入用的,并可改变进入 I plant tool workshop, the existing one in Wuhan Machine Tool Plant in December 70 factory M6420B hob grinding. The machine tool in the course of the graduation failure phenomenon. Now M6420B hob grinding degree of failure failure analysis is described as follows: The phenomenon of indexing failure gate gear and indexing movement, brake action in advance or delay will stop the indexing, thus undermining the semi-automatic cycle continues get on. The hydraulic diagram, as shown in Figure 1, which indexing hydraulic control box is used to control the spindle indexing movement, the box has two slide valve, the valve “C” is used to make the gear Disengaged from the index plate slot and insert used, and can change into