镀铬活塞杆表层裂纹分析与解决
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摘要
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.
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.
引文
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[5]柏洪武.爆炸喷涂WC/Co涂层组织性能研究[D].长沙:湖南大学材料工程学院,2010.
[6]吴旭,郭志猛.铝合金表面爆炸喷涂WC-17Co涂层性能的研究[J].粉末冶金工业,2013,23(5):22-25.
[7]韩文静,马红雷,宋进朝,等.基于BP模型的截齿WC-Co涂层耐磨性预测研究[J].电镀与精饰,2016,38(4):10-13.
[8]王铁钢,李柏松,阎兵,等.爆炸喷涂WC-Co/MoS2-Ni多层复合自润滑涂层的摩擦学行为[J].材料工程,2017,45(3):73-79.
[9]赵立英,刘平安.氧燃比对爆炸喷涂碳化钨涂层结构和性能的影响[J].材料工程,2016,44(6):50-55.
[10]赵立英,刘平安,代洪川.丙烷对爆炸喷涂碳化钨涂层结构和力学性能的影响[J].高校化学工程学报,2016,30(2):466-471.
[2]黄卫华,陈星,夏根杰,等.轴、杆镀铬表面微裂纹失效分析[J].航空维修与工程,2015(9):114-116.
[3]张斌,胡小华,向业.转轴裂纹失效分析[J].金属制品,2017,43(1):55-59.
[4]詹瑞秋,吴益文,汪宏斌,等.不同厚度电镀铬层的组织及性能[J].机械工程材料,2018,42(3):43-47.
[5]柏洪武.爆炸喷涂WC/Co涂层组织性能研究[D].长沙:湖南大学材料工程学院,2010.
[6]吴旭,郭志猛.铝合金表面爆炸喷涂WC-17Co涂层性能的研究[J].粉末冶金工业,2013,23(5):22-25.
[7]韩文静,马红雷,宋进朝,等.基于BP模型的截齿WC-Co涂层耐磨性预测研究[J].电镀与精饰,2016,38(4):10-13.
[8]王铁钢,李柏松,阎兵,等.爆炸喷涂WC-Co/MoS2-Ni多层复合自润滑涂层的摩擦学行为[J].材料工程,2017,45(3):73-79.
[9]赵立英,刘平安.氧燃比对爆炸喷涂碳化钨涂层结构和性能的影响[J].材料工程,2016,44(6):50-55.
[10]赵立英,刘平安,代洪川.丙烷对爆炸喷涂碳化钨涂层结构和力学性能的影响[J].高校化学工程学报,2016,30(2):466-471.