Simulation Study Of Hot Machining For High-Temperature Alloy Inconel718 Based On DEFORM-3D

The nickel based superalloy has good thermal strength,thermal stability and thermal fatigue,so it can be used in a number of important areas,such as aviation,nuclear energy,petroleum,transport industries.However,the processing characteristics of a large cutting deformation,low thermal conductivity and serious work hardening during the cutting process have an important impact on machining quality,tool life,machining cost and efficiency.As one of the categories of green manufacturing technology,hot machining technology has well solved the machining difficulty problem of difficult processing materials.In this paper,because of the poor processing performance of high temperature alloy,the high temperature alloy Inconel718 was taken as the research target,and the finite element simulation experiment of hot machining was carried out.Based on the relevant models of finite element technology,such as constitutive relation model of workpiece material,friction and wear model of cutting tools,contact friction and wear model of tool–chip,separation and fracture criterion of chip,heat transfer model and so on,the hot machining model of Inconel718 was established by using the finite element simulation software DEFORM-3D.Then single factor and orthogonal experiments were used to do the simulation test of hot machining,and the related research on cutting temperature,cutting force and tool wear depth were carried out.According to the finite element analysis of hot machining cutting process,the conculsions as following:(1)Compared with traditional machining,the hot machining tool cutting temperature can be reduced by 22.2%;the F_x can be decreased by 52.4%;the F_y can be decreased by47.6%;the F_z can be decreased by 50.7%;the depth of tool wear can be reduced by 21.9%.(2)Taking the minimum cutting temperature,cutting force and the minimum tool wear depth as the optimization objective,and considering the influence degree of cutting factors,the optimal combination factors can be obtained as follows:v=90mm/min、f=0.12mm/r、a_p=0.8mm、T=800℃.By the optimal combination of factors,tool cutting temperature is 278.07℃,F_x is 85.69 N,F_y is 577.36 N,F_z is 180.97 N,tool wear depth is0.0354 mm.(3)The finite element analysis method which combined hot machining technology with DEFORM-3D software can reduce the processing cost and shortens the processing time.