Research Of Thermal-mechanical Coupling Model And Surface Quality Prediction For Abrasive Belt Grinding Inconel 625

The nickel-based superalloys are significant components of areo-engine key parts,but it is extremely difficult to process.The general processing methods cannot achieve enough process technical requirements of heat parts.Inconel 625 is one of the nickelbased superalloys which can work under 1300℃.Inconel 625 has excellent performance to constitute the hottest part of gas turbine,however,its low thermal conductivity causes the processing temperature higher and then make the surface burnt.The abrasive belt grinding has lower temperature,higher specific grinding energy and better precision than another method.It can be used for machining this part.Nevertheless,the research on abrasive belt grinding Inconel 625 is not enough at present.It is necessary to make further study of its grinding technology.The research of this paper mainly includes the following aspects:(1)Based on the finite element differential method and thermo-mechanical coupled difference method,the mechanical differential equation of Inconel-625 superalloy during grinding is established by thermoelastic-plastic theory,and the coupling effect of grinding force and heat in belt grinding is analyzed.This research has established a relationship between heat generation and mechanical deformation which is thermo-mechanical coupling coefficients and derive the coupling coefficients of material.Finally,this paper calculates the results of mechanical differential equations.(2)The simplified finite element model of single grinding is established by the micro-morphology of abrasive belt surface and the movement track of belt grinding process.This paper uses the general finite element software to simulation the process of single abrasive grinding,and the results are accord with the actual processing.The change trends of grinding force and temperature can be obtained furthermore.The heat generation and material deformation phenomena of the chips are explained and analyzed.(3)The paper explores the thermo-mechanical coupling mechanism of abrasive belt grinding superalloy,designs the experimental projects,methods and confirms some corresponding theories.The experimental grinding force,grinding temperature and the relationship between them and the process parameters were obtained.The errors between the theoretical model and the experimental data have been analyzed,the error term based on the experimental data has been calculated,and the theoretical model is modified by error term,which can obtain the prediction model which is more accurate.(4)In this part,we use the modified prediction model,to develop software demo for optimal and prediction of abrasive belt grinding Inconel 625.The software optimizes the area abrasion ratio of abrasive belt and predicts the result.The result shows that the prediction error range can be controlled within 15%,and the area abrasion ratio of abrasive belt is the best one in the experimental group.This software can achieve the optimized and prediction goal.