Temperature Distribution And Thermal Deformation Study Of Deep Hole Parts Based On Reverse Tracing Method

For deep hole drilling with BTA,the cutting heat is derived from many aspects,such as chip deformation and the friction between cutter guide bar and the workpiece,and so on.As the high temperature will exacerbate the tool wear and causes the irregular deformation of the drilled hole,the drilling heat must be monitored and controlled effectively to prevent the high temperature occurring.Due to the complexity of the deep hole drilling,how to accurately predict the cutting heat distribution of the drilling region and ascertain the thermal deformation rule of deep hole drilling are the key research.Thus,in this paper,by investigating the heat distribution of the cutting region and analyzing its influences on the thermal deformation,this study will provide a reference for understanding numerous thermodynamic behavior occurring in deep hole machining,which has an important theoretical significance and application value.In this paper,a new method to monitor the cutting heat of cutting region is presented.Through the characteristics of heat flux in drilling region and the reverse tracking method,the local temperature of cutting region in the drilling experiment can be monitored in deep hole drilling process.In this method,the cutting region can be divided into many blocks,which is depending on analyzing the cutting heat generation mechanism of deep hole drilling.Then,the SFSM is adopted to track the average heat flux(the temporal distribution)of cutting heat flux,and is introduced into the iteration process of the CGM track the instantaneous heat flux(the spatial distribution),and then to obtain the spatial and temporal distribution of heat flux in drilling area and realize the temperature field refactoring of deep hole drilling product.Based on drilling area heat flux characteristics,the reverse tracking method of spatial and temporal distribution of the heat flux in drilling area are verified to be valid through monitoring the local temperature of workpiece in the experiments.On this basis,this study ascertains the law of temporal and spatial variation of deep outer flank cutting tool and a guide bar portion of the heat flux.For actual drilling the thermal deformation of porous parts problem,this paper constructed the deep hole drilling three-dimensional thermoelastic coupling calculation model of workpiece by finite element calculation method.Combining with the related experimental data and the reverse heat tracing method,this study reveals the actual drilling process workpiece temperature field distribution of three-dimensional characteristics and its effect on the deformation of deep hole parts,provides a basis for error analysis the process of porous parts.