镀铬活塞杆表层裂纹分析与解决

Analysis and Solution of Surface Crack of Chromium Plating Piston Rod

本文分析了伺服作动器活塞杆表层裂纹形成的机理,确定了活塞杆表层裂纹的性质和产生原因,以及裂纹的深度范围。采用具有压应力的爆炸喷涂WC/Co工艺代替电镀硬铬工艺解决活塞杆因深度裂纹而报废的问题,制定了可行的维修方案和技术路线,并确定了维修工序和参数。结果表明,修复的活塞杆满足图样尺寸及技术要求,经综合性能比较及磨合实验验证,WC/Co涂层优于电镀硬铬层。

In this paper,the formation mechanism of surface layer crack on piston rod of servo actuator was analyzed,the properties and causes of the surface layer cracks and the deepness scope of the crack were determined. The technology of detonation spray WC/Co were used to replace the hard chromium plating process in order to solve the problem of piston rod scrapped caused by deep cracks,the feasible maintenance plans and technical routes were worked out,and the maintenance procedure and parameters were determined. The results show that the piston rod repaired satisfies the drawing size and technical requirements,and the properties of WC/Co coating is better than the hard chromium plating,according to the comprehensive performance comparison and running-in test.