Ti-6Al-4V锻件与粉末冶金材料切削力研究

Cutting forces of Ti-6Al-4V forging and powder metallurgy materials

钛合金是典型的难加工材料,粉末冶金技术的应用能够明显减少钛合金材料的切削加工工序。对比Ti-6Al-4V锻件的切削力,研究Ti-6Al-4V粉末冶金材料切削力的波动特点及数学模型。Ti-6Al-4V粉末冶金材料的切削力不仅出现周期性的波动,而且存在剧烈的微波动。采用正交试验建立Ti-6Al-4V锻件和粉末冶金材料的切削力数学模型,经过检验,其模型能够准确地预测切削力的变化趋势。由两种材料的切削力数学模型得到:在切削Ti-6Al-4V锻件时,切削速度对3个方向切削力的影响最大;在切削Ti-6Al-4V粉末冶金材料时,进给量对进给抗力和主切削力的影响最大,而切深抗力受到切削速度的影响最大。

Titanium alloys are typical difficult-to-machine materials, and the application of powder metallurgy technology can significantly reduce the machining procedure of the titanium alloys. The fluctuation characteristics and mathematical models of cutting forces of Ti-6A1-4V powder metallurgy material were studied with comparison with cutting forces of Ti-6A1-4V forging material. The periodic fluctuations of cutting forces for Ti-6A1-4V powder metallurgy material appeared, and violent micro- fluctuations of the cutting forces were also observed. Mathematical models of the cutting forces of Ti-6A1-4V forging and powder metallurgy materials were built using orthogonal experiment, respectively. And the mathematical models could accurately predict the changing trends of the cutting forces with orthogonal model examination. It can be concluded from the cutting force models of both materials that the effect of cutting speed on cutting forces in three directions is greatest in machining of Ti-6AI-4V forging material. When Ti-6A1-4V powder metallurgy material is cut, the feed rate has the greatest effect on feeding force and main cutting force, and the influence of cutting speed on cutting depth force is greatest.