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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 alloy is a typical hard-to-process materials, powder metallurgy technology can significantly reduce the cutting process of titanium alloy materials. The cutting force of Ti-6Al-4V forging was compared with that of Ti-6Al-4V powder metallurgy. The cutting force of Ti-6Al-4V powder metallurgy not only appears periodic fluctuation but also violent micro-fluctuation. The mathematical model of cutting force of Ti-6Al-4V forgings and powder metallurgy materials was set up by orthogonal experiment. After testing, the model can accurately predict the changing trend of cutting force. The cutting force of the two materials is obtained: the cutting speed of Ti-6Al-4V forging, the cutting speed of the three directions of cutting force greatest impact; cutting Ti-6Al-4V powder metallurgy material, the feed rate into It gives the greatest impact to the resistance and the main cutting force, while the cutting depth resistance is most affected by the cutting speed.