| This thesis focuses on the nickel based alloy GH4169 material,a combination of 4 kinds of cooling lubrication methods were studied the performance of cooling and lubricating,thus revealing the material suitable for cooling and lubrication technology is the best way to trace nanoparticles jet lubrication;The theory and experiment of grinding temperature field of high temperature Ni based alloy under spray cooling of nano particles are studied deeply.According to the grinding mechanism,analyzed the heat transfer mechanism and to establish the corresponding grinding process;grinding temperature field and heat source model of grinding heat transfer model,analyzed the heat distribution of grinding interface and the heat convection;at the same time,with the help of ABAQUS software of finite element simulation,through the establishment of simulation,analysis of grinding heat transfer to the temperature variation of workpiece after;experiment programs were established,through the analysis of experimental results and simulation results,the better ability of cooling and lubrication cooling and lubricating mode;using the SNR analysis method and variance analysis method of nanofluids MQL grinding are studied,and to select the optimal combination of grinding parameters.The specific work of this research is as followed:(1)The application of nickel based alloy GH4169 and other difficult to machine materials is more and more extensive,and a lot of grinding heat is produced at the grinding interface,several cooling and lubrication techniques are analyzed,and the grinding characteristics of nickel-based alloy are briefly introduced.Summarize research status of Nano-MQL,Ni-based alloy and grinding temperature field.In order to strengthen the capability of heat transfer of grinding process,the research topic of this thesis is processed.(2)Based on the grinding theory,the generation and delivery modes of grinding heat are analyzed by characterizing the grinding parameters such as grinding arc length,grinding force and energy ratio coefficient.The heat source model of grinding temperature field is established.The heat transfer and convective heat transfer of the grinding interface are analyzed by three kinds of boundary conditions.(3)On the basis of heat transfer,the grinding heat conduction model was established,and the finite element simulation software was used to simulate the temperature field of the nickel-based alloy under the surface grinding.The effects of different ways of cooling and lubrication and grinding parameters on the grinding temperature field are analyzed.(4)In the four different cooling and lubrication methods,the experimental study of surface grinding about GH4169 was carried out.The optimal cooling and lubrication method is selected by Measuring and analyzing the grinding force,grinding temperature and surface roughness..The reliability of the simulation model were verified by comparing the experimental results and simulation results.(5)The SNR analysis and variance analysis method are used to study the plane grinding by Nano-MQL.The grinding parameters,SNR and the variance,are analyzed and calculated.And the optimal grinding parameters are obtained.Power spectral density analysis of surface profile,evaluate the effects of various factors on the quality of the machined surface. |
PDF Full Text Request