织构型高频液压冲击活塞副能耗模型构建及数值模拟  

Construction and Numerical Simulation of Energy Consumption Model of High-frequency Hydraulic Impact Piston with Cylindrical Texture

作　　者：郭勇 全松 龚俊 刘德顺 金永平 杨书仪 张龙燕 GUO Yong;QUAN Song;GONG Jun;LIU Deshun;JIN Yongping;YANG Shuyi;ZHANG Longyan(Engineering Research Center of Advanced Mine Equipment of Ministry of Education,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;National Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety Technology,Hunan University of Science and Technology,Xiangtan Hunan 411201,China)

机构地区：[1]湖南科技大学先进矿山装备教育部工程研究中心,湖南湘潭411201 [2]湖南科技大学海洋矿产资源探采装备与安全技术国家地方联合工程实验室,湖南湘潭411201

出　　处：《润滑与密封》2020年第6期76-82,共7页Lubrication Engineering

基　　金：国家自然科学基金项目(51705147,51779092,51809091,51705145);湖南省自然科学基金项目(2018JJ3182);湖南省教育厅项目(16A074,19B191,15C0542).

摘　　要：为降低液压冲击活塞副的摩擦损耗,在活塞副表面构造圆柱形织构;综合考虑其泄漏和摩擦损失构建能耗分析指标,采用Hertz接触理论分析间隙密封结构的弹性变形,利用牛顿内摩擦定理提取摩擦力,结合二维弹流润滑Reynolds方程构建冲击活塞副能耗分析模型;提出采用有限差分法以及超松弛迭代收敛准则对冲击活塞副能耗分析模型进行数值求解;以YG45型液压凿岩机为例对冲击活塞副进行能耗分析,验证了该方法求解冲击活塞副能耗的有效性,并分析织构对降低冲击活塞副能耗的作用。结果表明:圆柱形织构表面能形成流体动压润滑膜,在全油膜润滑状态下织构的流体动压润滑效应会显著提高表面的承载能力;圆柱形织构改善了表面的润滑性能,大幅度降低了表面摩擦力,使得摩擦损失减小;增加织构使泄漏损失有所增加,但其增加幅度很小,对能耗影响可以忽略不计。A cylindrical texture was constructed on the surface of piston pair to reduce the friction loss of the hydraulic impact piston pair.The energy consumption analysis index was constructed by considering the leakage and friction loss.Hertz contact theory was used to analyze the elastic deformation of the traditional seal structure,Newton s internal friction theorem was used to extract the friction force,and combining with the Reynolds equation,an analytical model of the energy consumption of the impact piston was established.A numerical method for solving the model with finite difference method and over-relaxation iterative convergence criterion was proposed.With YG45 hydraulic rock drill as an example,the energy consumption of the impact piston pair was analyzed to verify the effectiveness of this method in solving the energy consumption of impact piston pair,and the effect of texture on reducing the energy consumption of impact piston pair was also analyzed.The results show that the hydrodynamic lubrication film can be formed on the cylindrical texture surface,and the hydrodynamic lubrication effect of the texture under the condition of full oil film lubrication can significantly improve the bearing capacity of the surface,which is better than that without texture.The cylindrical texture improves the lubrication performance of the surface,greatly reduces surface friction and friction loss.The leakage is increased due to the texture,but the effect on energy consumption can be ignored since the increase of leakage is very small.

关 键 词：液压冲击器 冲击活塞副 圆柱形织构 能耗指标 

分 类 号：TH117[机械工程—机械设计及理论]