牛赢,焦锋,赵波,童景琳.钛合金Ti-6Al-4V纵扭超声铣削残余应力试验研究[J].表面技术,2019,48(10):41-51.
NIU Ying,JIAO Feng,ZHAO Bo,TONG Jing-lin.Experiment of Machining Induced Residual Stress in Longitudinal Torsional Ultrasonic Assisted Milling of Ti-6Al-4V[J].Surface Technology,2019,48(10):41-51 |
| 钛合金Ti-6Al-4V纵扭超声铣削残余应力试验研究 |
| Experiment of Machining Induced Residual Stress in Longitudinal Torsional Ultrasonic Assisted Milling of Ti-6Al-4V |
| 投稿时间：2019-03-19 修订日期：2019-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.10.005 |
| 中文关键词: 纵扭超声振动 铣削 Ti-6Al-4V 残余应力 加工参数 |
| 英文关键词:longitudinal-torsional ultrasonic vibration milling Ti-6Al-4V residual stress processing parameters |
| 基金项目:国家自然科学基金（U1604255，51675164）；河南省自然科学基金（162300410120） |
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| 中文摘要: |
| 目的 提出将纵扭超声振动和铣削加工相复合，对钛合金Ti-6Al-4V进行试验研究，探索工艺参数对加工残余应力的影响规律，实现钛合金的压应力抗疲劳制造。方法 通过试验对比分析了纵扭超声铣削和传统铣削在切削力、切削温度和残余应力的差异性。采用正交试验和单因素试验相结合的方法，同时考虑因素交互作用，研究了加工参数、冷却润滑条件以及刀具磨损对加工残余应力的影响。结果 相较于传统铣削，纵扭超声铣削能够使平均切削力降低约16.3%，切削温度降低约25.6%，表面残余压应力值增加31.3%。在所选参数范围内，径向切深对表面残余应力的影响较大（贡献率为34.1%），而振幅影响较小（贡献率为6.5%）。表面残余压应力值随着铣削速度、每齿进给量以及径向切深的增大有不同程度的降低，随着振幅的增大有一定程度的提高。采用乳化液作为切削液能够提高加工表面的残余压应力值，而干式切削能够获得和在水、油切削液条件下相当的加工表面残余压应力值。工件表面的残余压应力值随着刀具磨损的增加而逐渐减小。结论 纵扭超声铣削能够有效降低切削力和切削温度，提高加工残余压应力值，同时选择适当的工艺参数及润滑冷却条件可进一步增大表面压应力值，可作为一种可靠的压应力制造技术。 |
| 英文摘要: |
| The work aims to realize the compressive stress and anti-fatigue manufacturing of titanium alloy, propose the compound processing of longitudinal-torsional ultrasonic vibration and milling (LTUM), study the Ti-6Al-4V through experiment and explore the influence laws of process parameters on residual stress. The differences of cutting force, cutting temperature and residual stress between ultrasonic and traditional milling were analyzed through the experiment. The effects of processing parameters, cooling-lubrication conditions and tool wear on residual stress were studied by orthogonal and single factor experiments in consideration of the interaction of factors. Compared with traditional milling, LTUM reduced cutting force by about 16.3% and cutting temperature by about 25.6%, and increased the residual compressive stress (RCS) by about 31.3%. Within the range of selected parameters, radial depth had a greater influence on the RCS (contribution rate of 34.1%), while ultrasonic amplitude had a smaller influence (contribution rate of 6.5%). RCS decreased with the increase of milling speed, feed per tooth and radial depth, and increased with the increase of ultrasonic amplitude. When emulsified fluid was used as cutting fluid, RCS increased, while the RCS of dry cutting was equivalent to that of water and oil cutting fluids. RCS decreased with the increase of tool wear. LTUM effectively reduces the cutting force and temperature and increases the RCS. Appropriate process parameters and lubrication-cooling conditions should be chosen to further increase the RCS, and LTUM can be used as a reliable compressive stress manufacturing technology. |
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