计入粗糙度的液压缸仿生微织构耦合效应研究

在间隙密封液压缸缸筒的内表面构造仿生菱形微织构,研究计入液压缸摩擦副表面粗糙度与表面微织构对液压缸缸筒内表面摩擦润滑性能的耦合影响。利用等效流量法求解表面微织构与表面粗糙度的耦合效应,同时以液压缸常用材料45钢为试件开展摩擦学试验,并对试验结果和仿真结果进行比较。研究结果表明:液压缸摩擦副的表面粗糙度与表面微织构耦合作用非常明显,合适的表面粗糙度和表面微织构尺寸,可使液压缸缸筒内表面从混合润滑状态转变为流体润滑状态,从而增大缸筒内表面的动压润滑效应;缸筒内表面的菱形微织构形貌存在最优组合,使得液压缸缸筒内表面的摩擦因数最小、润滑性能最好。

Research on Coupling Effect of Biomimetic Micro texture of Hydraulic Cylinder Considering Roughness

The bionic rhombic micro texture was constructed on the inner surface of the gap seal hydraulic cylinder,and the coupling effect of the surface roughness and micro texture was studied.The equivalent flow method was used to solve the coupling effect between surface micro texture and roughness.The tribological experiment was carried out with 45 steel commonly used as hydraulic cylinders,and the simulation results were compared with the experimental results.The results show that there is obvious coupling effect between surface roughness and micro texture.The appropriate surface roughness and micro texture size will firstly change the inner surface of the cylinder from the mixed lubrication state to the fluid lubrication state,and improve dynamic pressure lubrication.There is an optimal combination of the rhombic micro texture and roughness on the inner surface of the cylinder,which makes the inner surface of the cylinder have the lowest friction coefficient and the best lubrication performance.