1　引言近年来 ,为了减轻飞机、汽车零部件的重量 ,铝合金的使用量逐年增加。尽管加工铝合金时比切削钢材时的切削阻力小 ,但由于铝合金比较软 ,切削时刀具刃部容易发生粘刀现象 ,从而影响被加工工件的表面粗糙度。为了增加铝合金材料的强度 ,通常在铝合金中加入大量硅元素。但 1 Introduction In recent years, in order to reduce the weight of aircraft, auto parts, the use of aluminum alloy increased year by year. Although the machining resistance of aluminum alloy is lower than the cutting resistance when cutting steel, but because the aluminum alloy is relatively soft, the cutting edge of the cutting tool is prone to sticking phenomenon, thus affecting the surface roughness of the workpiece. In order to increase the strength of aluminum alloy materials, aluminum alloys are usually added a large amount of silicon. but