Study On Grinding Performance Of Internal Cooling Grinding Wheel With Hybrid Nanofluids And Ordered Arrangement Of Abrasive

Grinding is the most widely used finishing method,which plays an irreplaceable role in the processing of key parts of nickel base alloy.In order to reduce the wear and fall off of grinding wheel particles caused by high temperature,as well as the cracks and burns of workpiece,intermittent grinding and internal cooling technology are used to improve the efficiency of liquid supply,and nanofluid is used to enhance the heat exchange performance of grinding fluid.In addition,the distribution of the grain family leaf order is designed to improve the fluidity of cutting fluid in the grinding area,so as to improve the phenomenon of wheel blockage.In this paper,combined with internal cooling grinding,intermittent grinding,phyllodes distribution and nanofluid technology,the thermal conductivity and viscosity characteristics of hybrid nanofluid grinding fluid were analyzed by molecular dynamics method.Based on the finite element simulation,phyllodes distribution grinding wheels with different abrasive groups were designed and manufactured,and GH4169 alloy grinding experiments were carried out to explore the influence of phyllodes distribution parameters and cooling and lubrication medium on its grindability The impact of energy.The main research contents are as follows:(1)Based on molecular dynamics simulation,the viscosity and thermal conductivity of water-based ILs-MWCNTs/Mo S₂ hybrid nanofluid at different temperatures were simulated,and the relationship between thermal conductivity and viscosity changes with temperature was obtained,which was used in the subsequent finite element simulation for the thermal conductivity of the grinding fluid The thermal conductivity and viscosity parameters are set;then,the thermal conductivity and viscosity of the hybrid nanofluid are measured by a thermal constant analyzer and a rotary viscometer to verify the reliability of the simulation method.Furthermore,through the contact angle measuring instrument,the influence of the thermal conductivity and viscosity changes of the hybrid nanofluid on the spreading performance of the hybrid nanofluid at different temperatures was studied.(2)Based on the phyllotaxis theory,the phyllotaxis distribution of abrasive group is designed,and the flow field model of grinding zone of internal cooling slotted wheel is established.The relative position between the center of abrasive zone and the outlet of grinding fluid is determined based on the flow field simulation.The influence of the phyllotaxis coefficient K,the diameter of abrasive group D and the radius of grinding wheel r on the flow performance of grinding fluid in the abrasive zone is discussed,and the streamline distribution of grinding fluid is obtained The effective flow rate through the abrasive zone was extracted,and the effective flow rate was used as the evaluation standard to optimize the phyllotaxis distribution parameters.(3)A temperature field model of internal cooling slotted wheel grinding zone based on the distribution of grain sequence is established.According to the temperature field,the influence of different distribution of grain sequence and cooling and lubricating medium on the heat transfer performance of grinding fluid in grinding zone is analyzed.The temperature distribution nephogram of grinding zone after heat transfer of grinding fluid is extracted,and the heat transfer of two kinds of cooling media is calculated by Newton's cooling law.The abrasive rings with phyllotaxy distribution of abrasive group were prepared by electroplating method,and the surface morphology was detected and analyzed by ultra-depth of field microscope to ensure that the abrasive rings meet the process requirements.(4)The internal cooling grinding experiment platform was built for the designed wheel with phyllodes distribution.The grinding experiment of GH4169 alloy was carried out based on the single factor experiment scheme.The results show that:compared with the conventional orderly arrangement,the phyllodes distribution can effectively enhance the heat transfer performance in the grinding zone and improve the processing quality;Compared with the traditional grinding fluid,the composite nanofluid can effectively reduce the grinding temperature and improve the surface quality.