微细电火花线切割与超精磨削加工表面摩擦性能比较

Tribological property comparison between micro-WEDM and superfinishing grinding machining surfaces

采用小于16μJ的微能量进行微细电火花线切割加工,结合放电机理、润滑理论和热力学传递过程,综合研究微细电火花线切割加工表面在润滑条件下的摩擦磨损性能,并与超精磨削加工表面在同种条件下进行对比。研究结果表明:由于微细电火花线切割加工表面微观形貌的各向同性特征,其表面支承面积率增加速度快,核心区容积和谷底区容积都较大,支承特性和液体滞留性均优良;不同电参数加工的表面在不同转速和不同载荷的润滑摩擦下均处于边界和流体润滑状态,且摩擦因数稳定,具有明显的优于超精磨削加工表面的摩擦学性能。

Less than 16 μJ micro energy was adopted to process with micro wire electrical discharge machining.Combining with discharge mechanism,lubrication theory and thermodynamic transfer process,the tribological properties of micro-WEDM surface under lubrication were researched synthetically and compared with superfinishing grinding machining surface under the same condition.The results show that owing to the isotropy character of micro-topography,the surface bearing area ratio of micro-WEDM surface has a rapid increase and both the core area and valley region have great volume.Accordingly,both the bearing characteristic and liquid retention property of micro-WEDM surface are better.The surfaces with different electrical machining parameters are all in a state of boundary and liquid lubrication under different rotate speeds and lubrication frictions.At the same time,with steady friction coefficient,the micro-WEDM surface has better proformance than that of superfinishing grinding machining surface.