高压油泵凸轮轴激光增材制造梯度耐磨层研究

发布时间：2018-04-23 17:31

本文选题：激光增材制造 + 凸轮轴　；参考：《机械工程学报》2017年06期

【摘要】：为改善高压油泵凸轮轴的耐磨性能与工作可靠性,采用5 kW CO_2激光器、四轴联动数控机床及载气式同轴送粉系统等设备对复杂形貌高压油泵凸轮轴进行激光增材制造梯度耐磨涂层工艺研究。通过梯度耐磨涂层结构设计、凸轮边缘防塌陷工装研制与凸轮运动轨迹控制等关键技术的研究,实现了均匀无缺陷且凸轮边缘保护良好的高硬度梯度耐磨涂层的制备。同时,利用扫描电镜、X射线衍射仪、显微硬度计及光学显微镜等分析、测试仪器对梯度耐磨涂层宏观形貌与微观组织进行表征。利用高压喷油泵试验台对激光增材制造与渗碳淬火处理凸轮轴进行使用寿命对比考核测试。结果表明,梯度涂层中主要由γ-Co固溶体、Co_3B及M_(23)C_6等相组成;其中过渡层与耐磨层还存在WC与W_2C形式的增强相,微观组织主要表现为灰白色共晶组织与深灰色枝晶组织;梯度涂层与基体形成良好的冶金结合;增材处理后的凸轮表面耐磨损性能明显提高,使用寿命较渗碳淬火凸轮轴提高约65%。
[Abstract]:In order to improve the wear resistance and reliability of camshaft of high pressure oil pump, a 5 kW CO_2 laser is used. Four-axis linkage NC machine tool and gas-carrying coaxial powder feeding system were used to study the fabrication of gradient wear-resistant coating on camshaft of high-pressure oil pump with complex morphology. Through the research on the structure design of gradient wear resistant coating, the development of anti-collapse tool for cam edge and the control of cam motion path, the preparation of uniform and non-defective high hardness gradient wear resistant coating with good edge protection is realized. At the same time, the macroscopic morphology and microstructure of the gradient wear-resistant coatings were characterized by scanning electron microscope (SEM), microhardness tester and optical microscope. Using the high pressure fuel injection pump test rig, the service life of camshaft produced by laser and Carburized quenching was compared and tested. The gradient coating formed a good metallurgical combination with the substrate, and the wear resistance of the cam surface after the treatment of the increased material was obviously improved, and the service life of the camshaft was increased by about 65% than that of the camshaft after Carburizing and quenching.
【作者单位】：长春理工大学机电工程学院;
【基金】：国家装备预研基金资助项目(51318060104)
【分类号】：TG174.4

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