超声磁力复合研磨对TA18管内表面光整加工

Finishing machining of inner surface of TA18 pipe by ultrasonic–magnetic composite grinding

采用超声波振动辅助磁力研磨的加工技术对TA18钛合金管内表面进行光整加工,研究了振动频率和振幅对加工质量的影响。结果表明:当在振幅10 mm下采用19 kHz的振动频率对TA18管内表面研磨50 min时,研磨效果最好,加工效率得到了提高,表面粗糙度从原始的1.20μm降至研磨后的0.07μm。钛合金表面的应力状态由原始的残余拉应力+169 MPa变为压应力-80 MPa,有效提高了工件的疲劳强度。

The inner surface of TA18 titanium alloy pipe was finished by ultrasonic vibration-assisted magnetic grinding. The effects of vibration frequency and amplitude on finishing quality were studied. The results showed that the grinding effectiveness and efficiency for the inner surface of TA18 titanium alloy pipe are the best after grinding at a vibration amplitude of 10 mm and a vibration frequency of 19 kHz for 50 min, as shown by the decreased surface roughness from 1.20 μm previously to 0.07μm after grinding. The stress at the titanium alloy surface is converted from tensile （＋ 169 MPa） to be compressive （-80 MPa）, improving the fatigue strength ofworkpiece effectively.