Finite Element Simulation And Experimental Study On Grinding Temperature Of Alumina Ceramics

Alumina ceramics are used in many fields with excellent physical and chemical properties,but it is also a kind of typical difficult to machine material.At present,the machining of alumina ceramics is mainly made of diamond abrasive tools.In the grinding process of ceramic materials,the removal mechanism of materials is closely related to the grinding temperature.However,there are still many problems in the measurement and analysis of the actual grinding temperature of alumina ceramics.In this paper,the grinding temperature of single diamond grits,finite diamond grits and uniformly arranged diamond grits on the grinding of alumina ceramics were studied.The grinding force and grinding temperature of single abrasive grain were measured and compared with the results of finite element simulation model which considering the thermocouple.And corrected the heat transfer ratio of the incoming workpiece to optimize the simulation model.Then on this basis,this paper also studies the influence of thermocouple,grinding parameters,the number of abrasive grains and the location of abrasive grains on grinding temperature.The main research results are as follows:1.The experiment and simulation show that the ceramic grinding temperature increases with the feed rate and grinding speed.2.The simulation results show that in the ceramic grinding temperature measurement,the addition of thermocouple will lead to the increase of the measured grinding temperature under the same heat source conditions.And the rise amplitude is related to the processing parameters.3.The ratio of heat transfer to the workpiece is corrected by fitting the experimental temperature with the simulated temperature.The heat transfer ratio ? increases with the increase of grinding depth and grinding wheel speed,and the fluctuation range is larger.4.The number and amplitude of heat pulse signals obtained by grinding temperature measurement are closely related to the array of abrasive grains passing through the thermocouple.Axially arranged abrasive grains can affect the strength of the thermal pulse,while the circumferential arrangement of abrasive particles will affect the number of thermal pulses signals.5.Under the same grinding conditions,the increase of abrasive grain heat source will lead to the increase of grinding temperature.The measured grinding temperature signal is the result of the interaction of multiple abrasive grains.