Research On The Deviation And Surface Integrity Of Thin-wall Bearing Rings In Hard Turning

Thin-wall bearing rings are an important supporting part to realize the lightweight and miniaturization of industrial products.However,the design requirements of high hardness and small wall-thickness of thin-wall bearing rings bring severe challenges to the machining.The dimensional accuracy and surface quality are difficult to control,and the reject rate is high.Hard turning is a recent machining technology with high efficiency,high flexibility and environmental friendliness.Compared with grinding,hard turning is competitive in many cases with substantial benefits.It has attracted much attention in the bearing manufacturing industry.Therefore,this paper taked the hard turning of thin-wall bearing rings as the research object,analyzed the influence of cutting parameters on cutting force,cutting temperature and chip morphology,through theoretical calculation,simulation analysis and experimental research,studied the effects of the number and the shape of claws,cutting forces or else on deviation and analyzed the effects of the machining deviation,cutting tool materials and cutting parameters on surface integrity.The main research works are as follows:(1)In this paper,the effect of cutting parameters on cutting force,cutting temperature and chip shape was studied by the dry hard turning experiments of GCr15(62~65HRC)with the PCBN tools and coated cemented carbide tools.(2)In view of the current common work holding of thin-wall bearing rings in hard turning,the analytic calculation model and finite element simulation model of clamping deviation were established and analyzed the influence factors of clamping deviation.On this basis,the finite element simulation model of machining deviation based on contact stress was established and the influencing factors of machining deviation were analyzed.The experimental verification was carried out and the work holding scheme for reducing machining deviation was put forward.(3)The surface integrity experiments of GCr15(62~65HRC)in dry hard turning with the PCBN tools and coated cemented carbide tools was carried out,and the influence of machining deviation,tool materials and cutting parameters on surface roughness,surface residual stress and internal residual stress distribution was studied.