柱塞泵配流副滑摩界面摩擦磨损及热力耦合分析

针对轴向柱塞泵配流副滑摩过程中由摩擦温升所引起的摩擦磨损问题,建立配流副轴对称非稳态热传导方程,利用ABAQUS有限元软件进行配流副摩擦磨损及热力耦合特性分析,并利用端面摩擦磨损试验机进行试验验证。结果表明:在滑摩初期,相比于中低压力,高压力工况更易发生磨粒磨损;随着滑摩进行,材料表面粗糙峰被磨平,加之温度上升,材料强度下降,高转速取代高压力成为接触面温度和摩擦系数增大的主要影响因素,此时的磨损机制主要为黏着磨损;在滑摩过程中,外径出现了应力集中现象,且接触压力高于内径;转速及压力对配流副摩擦温升及磨损特性的影响是非线性的,在相同PV值下,转速比压力的影响更为显著。

Thermo-mechanical Coupling Analysis of Port Plates Contact Surface in Piston Pumps

Aiming at the friction and wear caused by the temperature rise of the axial piston pump pair in the working process, the axisymmetric unsteady heat conduction differential equations are established, and use the ABAQUS to perform the thermo-mechanical coupling analysis of the valve pair, the end-face friction and wear tester was used for experimental verification. The results show that at the beginning, under high pressure conditions are more prone to abrasive wear than under medium and low pressures conditions. As sliding friction progresses, the rough peaks of the material surface are smoothed, and the temperature rises cause the material strength decreases, the high rotation speed replaces the high pressure as the main factor affecting the temperature and friction coefficient rise of the contact surface, at this time, the wear mechanism is mainly adhesive wear; in the sliding friction process, stress concentration appeared in the outer diameter, and the contact pressure was higher than the inner diameter; the influence of velocity and pressure on the friction temperature rise and wear characteristics of the distribution pair is nonlinear, under the same PV value, the influence of rotation speed is more significant than that of pressure.