超声振动辅助铣削加工钛合金表面摩擦磨损性能研究

目的研究超声振动辅助铣削加工钛合金表面形貌及摩擦磨损性能的优势。方法将0、6、12μm的超声振动振幅分别施加到铣削加工的进给方向加工TC4钛合金,得到不同加工参数条件下的表面形貌。用多功能扫描电子显微镜观察不同条件下的微观表面形貌,并且对不同表面的摩擦磨损性能进行了测试,分析了超声振动对表面摩擦磨损性能的影响。结果施加超声振动后,表面微观形貌与传统铣削加工存在较大区别。表面微观形貌不仅存在因进给速度产生的进给划痕,还存在一定规律的微观织构。摩擦磨损试验分析了干摩擦与润滑脂摩擦两种情况。干摩擦条件下,超声振动对摩擦系数的影响较明显,振幅为6μm时,摩擦系数有所减小;振幅为12μm时,摩擦系数有所增大。脂润滑条件下,摩擦系数变化较小。结论通过超声振动辅助铣削可以加工出具有一定微观形貌的表面织构,这些微织构的存在影响了加工表面的摩擦磨损性能,对于研究表面抗磨减阻性能有一定的作用。

Wear and Friction Properties of Titanium Alloy Surface Subject to Ultrasonic Vibration Assisted Milling

The work aims to study advantage of ultrasonic vibration assisted milling titanium alloy in surface morphology as well as wear and friction properties.The ultrasonic vibration amplitude of 0,6 and 12 μm were applied to feed direction of milling to process titanium alloy Ti-6Al-4V,and obtain surface morphology provided with different machining parameters.Micro surface morphology under different conditions was observed with SEM.Wear and friction properties of different surfaces were also tested,and effects of ultrasonic vibration on surface wear and friction properties were analyzed.The surface morphology differed a lot from that of conventional milling after ultrasonic vibration was applied.In addition to feed scratches generated as feed speed was present,the surface morphology included certain regular microtexture.Dry friction and lubricating grease friction were both analyzed during the wear and friction test.Under the condition of dry friction,the effect of ultrasonic vibration on coefficient of friction was more obvious.The coefficient of friction decreased at the amplitude of 6 μm and increased at 12 μm.Under the condition of lubrication friction,the coefficient of friction changed slightly.Surface texture with certain microstructure can be obtained by ultrasonic vibration assisted milling,presence of such microtexture affects wear and friction properties of machined surface,which plays a certain role in studying anti-wear and drag reduction properties of machined surface.