液压柱塞泵双金属支承圈真空扩散焊技术研究

Study on the Vacuum Diffusion Welding of Bimetal-Support Ring in Hydraulic Piston Pump

摘要: 针对高压柱塞泵支撑圈在工作过程中所受到高剪切应力及高摩擦力严酷条件，开展了针对其应用特点的工艺制作方法技术攻关。通过真空扩散焊接技术，在真空或保护气氛下，要使被焊接的两个工件的表面达到原子间的距离并通过相互扩散达到彼此结合，则需要在高温度、高压力及一定的时间下保持接触。采用这种方法可以实现钢与铜或铜合金高精度、高强度地有效连接。通过试验，获得了材料扩散焊所需的温度及保温时间等参数，试件经过拉伸强度测试及配合柱塞泵性能测试，满足使用要求。

Abstract: In view of the severe conditions of high shear stress and high friction in the working process of the support ring of high pressure piston pump, the technological process and key problems of its ap-plication characteristics are carried out. The two welded workpieces are welded in vacuum or protective atmosphere through vacuum diffusion welding technology. During welding, the surfaces of the two welded workpieces are contacted and maintained at high temperature and high pressure for a certain time in order to achieve the distance between atoms. Using this method, the high-precision and high-strength effective bonding between steel and copper or copper alloys can be achieved. Obtaining the temperature and holding time required for the test diffuser by experi-ment, the specimens were tested for tensile strength and performance testing of the piston pump to meet the application requirements.