Research On Low Residual Stress Grinding Of Hardened20CrMnTi

20CrMnTi is a kind of steel which is widely used in gear manufacturing. After carburized andthen quenched, the hardness and the wear resistance on surface are improved, while the toughness inthe core remains. However, many superior mechanical properties are brought in after heat treatmentalong with some distinct difficulties. The fatigue resistance and service life are significantlyinfluenced by tensile residual stress or high magnitude of compressive residual stress which is oftengenerated after grinding. And the low residual stress grinding is a kind of grinding process which caninduce low magnitude of compressive stress and solve these problems.The purpose of this paper is to realize the low residual stress grinding of hardened20CrMnTi.Through summary and analysis of the present relevant study, close relationship is found betweenresidual stress and three important indicators (grinding force, specific grinding energy, grindingtemperature). So, experimental research is conducted to find the changing regulation of these threeindicators due to variation in grinding parameters, in order to control grinding residual stress. Andfinally the low residual stress grinding of hardened20CrMnTi is achieved.During the whole research, the main work accomplished is as follows:(1) Comparative experiment is conducted on hardened20CrMnTi with monolayer brazed cubicboron nitride (CBN) wheel and white fused alumina (WA) wheel. It is found that brazed CBN wheelcan reduce the grinding force, specific grinding energy and grinding temperature effectively under thesame grinding condition. So, CBN wheel is more potential to realize low residual stress grinding.(2) Experimental research is conducted on hardened20CrMnTi with monolayer brazed CBNwheel. And the changing regulation of grinding force, specific energy and grinding temperature withthe variation of grinding parameters is found, which is important significance for the achievement oflow residual stress grinding.(3) X-ray diffraction (XRD) measurement is used to test the grinding residual stress. And thechanging rule is found with the increase of wheel speed (vs) and workpiece speed(vw). Finally the surfaceintegrity including surface morphology, surface roughness, metallographic structure and micro-hardness istest so as to evaluate the low residual stress grinding process.