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中文摘要：
为了提高粉末冶金气门座圈实际加工中的加工表面质量和刀具寿命,需要研究聚晶立方氮化硼（PCBN）刀具硬态切削时切削参数对切削力的影响规律。文章通过正交试验设计,建立了PCBN刀具硬态切削粉末冶金气门座圈切削力的经验公式,并研究了切削用量对切削力的影响。试验结果表明：PCBN刀具硬态切削粉末冶金气门座圈时,刀尖圆弧半径和负倒棱导致径向力相对较大;切削参数中切削深度和进给量对切削力的影响较大,切削速度的影响相对较小;切削V581过程中,主切削力随着切削速度的增加而有所下降;实际加工中应选用较小的切削深度和进给量、较高的切削速度,以提高加工表面质量和刀具寿命。
英文摘要：
In order to improve the surface quality and tool life of hard machining powder metallurgy valve seat with polycrystalline cubic boron nitride（PCBN） tools, the influence of cutting parameters on cutting forces should be studied. By the orthogonal experimental design of PCBN cutting tool in hard turning of powder metallurgy valve seat, empirical formulas of cutting forces were set up and the effect of cutting parameters on cutting forces was studied. The experimental results indicate that the radial force is relatively large because of the tool nose radius and negative chamfer. The cutting forces are mainly influenced by feed rate and cutting depth, while the cutting speed has less effect. ,With the increasing of cutting speed, the main cutting force decreases during the machining of V581. Light cut- ting depth, low feed rate and high cutting speed should be chosen in practical machining, to improve the surface quality and tool life.
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