液压泵滑靴双金属扩散焊性能稳定性验证研究

Performance Stability of Bimetal Diffusion Welding of Hydraulic Pump Slipper

针对某批次液压泵滑靴铜层出现掉块、剥落等问题,对液压泵的使用可靠性进行了评估研究。分析了滑靴铜层剥落的内在原因与滑靴双金属扩散焊层孔隙有关,采用工业CT技术检测扩散焊层孔隙并制定检测要求;选定缺陷最大的滑靴作为研究样本,仿真分析其扩散焊界面缺陷处的应力分布和损伤判据,并通过220 h耐久试验验证。结果表明:试验泵运行良好,性能稳定,分解后检测样本滑靴扩散焊界面缺陷试验前后稳定无变化,确认该批次液压泵安全可靠,可以继续使用。为液压泵工程应用研究提供了部分参考。

Aiming at the problems of falling blocks and peel off slipper copper of hydraulic pumps, the reliability of hydraulic pump is evaluated. The analysis shows that the peel off are related to the pores of bimetal diffusion welding layer of sliding shoe. Using industrial computerized tomography technology to detect the pores of diffusion welding layer and formulate detection requirements. The slip shoe with the largest defect is selected as the research sample, and simulation analysis the stress distribution and damage criterion of diffusion welding layer. The results of 220 h endurance test show that the test pump’s performance is stable and has no wear. The size and position of the large pores in diffusion welding layer is stable, which has no change. The study determined that this batch of hydraulic pumps are safe and reliable and can be used continuously. The study provides a reference for the engineering application research of hydraulic pump.