| In terms of the problem of high temperature and uneven temperature distribution over the profile surface of the grinding zone during grinding of the turbine slots which made of superalloys and titanium alloys,the heat pipe technology is applied to profile grinding and an axial rotating heat pipe profile grinding wheel is designed.Through simulation analysis and grinding experiments,different parameters of heat pipe and different grinding parameters were investigated and analyzed to explore their effect on the heat transfer performance of the heat pipe as well as the temperature control of the grinding zone.The optimized process parameters were used for profile grinding of titanium alloy workpiece,to reach the objective of dissipating grinding heat,controlling profile surface temperature,reducing temperature difference and preventing the grinding burns.The main research work in this paper is as follows:(1)The structural design of the axial rotating heat pipe profile grinding wheel was completed,including the structure of the profile surface of the abrasive layer of the grinding wheel,as well as the structure of heat pipe.(2)A simulation of the heat transfer performance of the axial rotating heat pipe profile wheel was carried out.The phase change mechanism of the heat pipe evaporation section was analyzed.The effect of heat flux,liquid volume and swirl velocity on heat transfer performance of the heat pipe grinding wheel was investigated,which provides a reasonable range of parameters for the grinding experiment.(3)A profile grinding experiment of titanium alloy workpiece by using the designed axial rotating heat pipe profile grinding wheel was carried out.Based on the simulation results,the optimal parameter combination was selected for profile grinding on titanium alloy.The microstructure of workpiece was analyzed,which verified the heat transfer capacity of the heat pipe grinding wheel and the control effect on the temperature of the grinding zone. |
PDF Full Text Request