Abstract:Effect of single cutting parameter on cutting forces was changed in experimental turning 42CrMo steel, and the influence regularity of changing cutting parameter was obtained on main cutting force, feeding force, rake force and total cutting forces. The cause of changing cutting forces between different cutting parameter was analyzed comparatively, and appropriate cutting parameter was provided for semi-fine machining period of cutting 42CrMo steels. The results show that rake cutting force, cutting depth and feed rate have larger effect on main cutting force, while the effect of cutting speed of that is less. The change regularity of total cutting force is similar to main cutting force, and the feed rate exerts more influence over feeding force.