According to the instability in machined quality during high-speed cutting of high-strength steel 300M, a series of experiments on high-speed dry turning of 300M are carried out. Effect of cutting parame-ters on machined surface roughness and residual stress is investigated. The result shows that the feed rate has the greatest influence on the machined surface roughness Ra. The residual material height difference becomes larger with the increase in feed rate, which lead to the poor machined surface quality. The machined surface compressive stresses are obtained in the feed direction and the cutting direction. The influence of cutting speed and depth of cut is greater. The lower machined surface roughness and higher surface residual compressive stress can be obtained at vc=300~400 m/min, f=0. 15~0. 20 mm/r and ap =0. 10 ~0. 15 mm. The re-search of this paper has theoretical significance on optimization of cutting technology for high-strength steels and manufacturing of high-reliability landing gear parts.%针对高强度钢300 M在高速切削时加工质量不稳定的切削特点,对其进行高速干车削试验,研究切削参数对加工表面粗糙度和残余应力的影响,结果表明:进给量对加工表面粗糙度Ra的影响最大,且随着进给的增加,加工表面残留材料高度差变大,加工质量变差;加工表面进给和切削方向的残余应力均为压应力,切削速度和切削深度对残余应力的影响较大;在vc=300~400 m/min、f=0.15~0.20 mm/r、ap=0.10~0.15mm的切削条件加工时,可以获得较低的加工表面粗糙度和较大的表面残余压应力.文中的研究对高强度钢类难加工材料的加工工艺优化及高可靠性起落架零部件的制造具有理论指导意义.
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