Study On Heat Transfer Performance Of Axial Rotating Heat Pipe Grinding Wheel

Combining with the development and application of superabrasive grains,profile grinding shows more remarkable advantages in the processing of aerospace difficult-to-machine materials(such as superalloys,titanium alloys,etc.).The machining accuracy and surface quality of profile grinding are better than other machining methods especially in the processing of aeroengine turbine disk groove.However,due to the strong adhesion of the difficult-to-machine material and its poor thermal conductivity,the grinding temperature is so high that causes the surface thermal damage of the workpiece and grinding wheel wear,which restricts the advantages of profile grinding technology into full play.A radial revolving heat pipe grinding wheel has been applied to control the temperature of the grinding zone in the prior studies,demonstrating the feasibility of "heat pipe technology" for high-efficiency grinding of difficult-to-machine materials.In view of this,an axial rotating heat pipe is introduced into the profile grinding wheel in this paper,and this axial rotating heat pipe grinding wheel(ARHPGW)is designed and manufactured to form the turbine disk groove.Heat transfer performance experiment is carried out to verify the feasibility of the ARHPGW for forming grinding of difficult-to-machine materials.Factors including condenser cooling conditions,amount of the working medium and evaporator heat flux are also considered into the experiment,in order to investigate their effects on the performance of ARHPGW.The research results are of great significance to solve the problem of high grinding temperature when profiling grinding difficult-to-machine materials.The main contents of this paper are as follows:1)The design method of ARHPGW has been put forward according to the processing requirements of aeroengine fir-type disk groove.And the design and manufacture of the assembled ARHPGW has also been finished based on this method.2)The heat transfer experiment has been carried out with a cylindrical ARHPGW,demonstrating its feasibility for cooling grinding zone and obtaining suitable condenser cooling conditions and fluid loading.The result shows that,15% fluid loading and jet cooling with 6?,85 m/s cold wind outside the condenser can exert the heat transfer performance of the ARHPGW.3)Combining with working medium distribution simulation on the evaporator inner cavity,the heat transfer experiment has been carried out with the fir-type ARHPGW,providing the basis for the filling rate selection and structure optimization.It has been observed that most of the working medium is accumulated in the adiabatic section of ARHPGW due to its structural particularity.In order to bring the advantages of heat pipe into full play,the fluid loading rate of the fir-type ARHPGW should be twice as much as the cylindrical one.