Surface microstructure of titanium alloy thin-walled parts at ultrasonic vibration-assisted milling
Surface microstructure of titanium alloy thin-walled parts at ultrasonic vibration-assisted milling
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DOI：
10.1007/s00170-018-3005-7
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
J. Tong;G. Wei;L. Zhao;Xiaoliang Wang;Junjin Ma
中科院分区：
文献类型：
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作者：
J. Tong;G. Wei;L. Zhao;Xiaoliang Wang;Junjin Ma
钛合金薄壁件的铣削加工是一项非常具有挑战性的任务，由于钛合金薄壁件的加工难度大、刚度低，加工振动是影响加工精度的主要因素。钛合金薄壁件的普通铣削（CM）加工很难获得高质量的加工表面组织，因此寻找一种有效的加工方法以获得更好的表面组织显得尤为重要。针对普通超声振动辅助铣削加工存在的问题，提出了振扭复合超声振动辅助铣削技术。工件与刀具高频振动分离的切削方法降低了平均切削力。从而抑制刀具后刀，并进一步提供良好的加工表面。本文首先建立了LTCUVM的运动学模型，分析了切削刃后刀面运动随主轴转速变化的规律。建立了两种加工方法的有限元模型，揭示了CM和LTCUVM在微细铣削加工中的显著差异。设计并进行了相关实验。实验结果表明，与相同工艺参数的CM相比，LTCUVM有效地降低了平均切削力，并进一步降低了表面粗糙度和振痕高度。
Milling of the titanium alloy thin-walled workpiece is a critical challenging task and the machining vibration is a major effect on the accuracy of the final part due to difficult machining properties and low stiffness. The common milling (CM) is very hard for titanium alloy thin-walled parts to get high-quality machined surface microstructure, so finding an effective way of processing to obtain better surface microstructure is particularly important. In this article, the longitudinal-torsional composite ultrasonic vibration-assisted milling (LTCUVM) is proposed to overcome the problems of the common milling. The cutting method of the high-frequency vibration separation of a workpiece and the tool reduces an average cutting force. Thereby suppressing the tool relieving and further providing a good machined surface. In this study, firstly, the kinematic model of LTCUVM was established and the variations of the movement of the cutting edge flank with the spindle speed change were analyzed. Then the finite element model (FEM) of the two processing methods was developed and significant differences between the CM and LTCUVM in the micro-milling were revealed. Further, related experiments were designed and conducted. Finally, the experimental analysis showed that the LTCUVM effectively reduced an average cutting force, and further reduced surface roughness and height of chatter marks compared to the CM with the same processing parameters.