高温合金K445微磨削表面质量实验研究

为探究镍基高温合金的微尺度磨削表面质量,首先采用0.9 mm磨头直径、500#磨粒的微磨棒对典型镍基高温合金材料K445进行微尺度磨削三因素五水平正交试验.通过极差分析找出影响微磨削表面质量的主次因素:进给速度的影响最大、主轴转速次之、磨削深度的影响最小;优化出了微磨削K445的理想工艺组合,即进给速度fm=20μm/s、磨削深度ap=6μm、主轴转速vg=58 kr/min时,加工表面粗糙度最小,Ra为462 nm.其次通过单因素实验总结出了进给速度、磨削深度、主轴转速及微磨棒悬伸量对K445磨削表面质量的影响规律,并对其原因进行了深入分析,使之为镍基高温合金微小零件的加工提供重要的理论依据.

Experimental Study on Surface Quality in Micro-grinding of Superalloy K445

To explore the micro-grinding surface quality of nickel-based superalloy， orthogonal experiments of three factors and five levels on nickel-based superalloy K445 were performed using a micro-grinding tool with ^#500 grains and 0.9mm diameter. The influencing factors on the surface roughness were clarified according to the range analysis: the feed rate was a dominant factor， followed by spindle speed and grinding depth. The optimized parameters combination was as follows: feed rate f_○m=20μm/s， the grinding depth a_○p=6μm and the feed speed v_○g=58kr/min， on which the surface roughness R_○a=462nm， being minimum. Then， how the factors such as spindle speed， feed speed， grinding depth and overhanging length affected grinding surface quality was analyzed through a single-factor experiment so as to provide important theoretical basis for fabricating micro nickel-based superalloy workpiece.