我厂一台ＸＪＪ－４０型修井机，其上滚筒主轴的花键部分在使用中常常被磨损而失效，其主要原因是滚筒承受的力过大，造成三角支架松动，不能很好地固定主轴，因而花键在键套中颤动而被磨损。主轴的材质为４５＃钢，经机械加工、调质处理后制成。因换一根主轴需３５００元，经 I plant a XJJ-40 workover rig, the spline part of the drum spindle is often worn in use failure, the main reason is the roller to withstand the force is too large, resulting in triangular bracket loose, not well fixed Spindle, so the spline in the key set in the vibration and wear. The material of the spindle is 45 # steel, which is made by machining and quenched and tempered. For a spindle to be 3500 yuan, after