钛合金(Ti-6Al-4V)铣削参数对表面完整性影响研究

Effects of milling parameters on surface integrity of titanium alloy(Ti-6Al-4V)

钛合金被广泛应用到航空航天、生物和化工领域,关于其加工过程中表面完整性的研究受到了相应的关注。文中研究了钛合金侧铣过程中铣削参数对表面完整性的影响规律,为更好地选择铣削参数及进行表面完整性控制提供相关的试验参考依据。研究结果表明：已加工表面的粗糙度随着铣削速度、每齿进给量、铣削宽度和铣削深度的增加而增加;进给方向的残余应力σx和垂直进给方向的残余应力σy均为压应力,随着铣削速度、每齿进给量、铣削宽度和铣削深度的增加,σx和σy总体上具有增加的趋势;已加工表面的显微硬度相比于基体增长了13%～50%,在表面层深度h为20μm处,显微硬度值最小。

As titanium alloy has been widely applied to the field of aerospace, biomedical and chemical industries, the study of surface integrity of titanium alloy in the machining process has been attentioned. In the study, in order to analyze the effect of milling parameters on the controlling surface integrity and provide relatively accurate experimental basis, a series of side milling experiments were conducted to systematically study the effects of milling parameters on surface integrity. The results showed that,the surface roughness of milled surface increased with the milling speed,feed per tooth, milling width and milling depth. The residual stress σxin feed direction and σyin cutting direction were compressive stress; The residual stress σxand σywould increase with the increase of milling speed,feed per tooth, milling width and milling depth. The milled surface microhardness was about 13%～50% higher than the basal material, and the microhardness was lowest at the distance h below surface of 20 μm.