Numerical Simulation On Precision Forging Process Of TA11 Alloy Second-class Blade

A blade,which plays the role of energy conversion,is one of the most important parts in aero-engine.Precision forging of blade is the tendency of developing blade forging technology.Because the shape of the blade is complex and it is difficult to deform the material used to manufacture blades,the blade precision forging technology is not sophisticated and lack systemic and intrinsic cognition.In this thesis,the method of the coupled thermo-mechanical numerical simulation was used to research the precision forging process of second-class blade made of alloy TA11.The following contents are included in this paper.(1) In this thesis,The precision forging process of blade has been designed,then the engineering software UG is regarded as geometric modeling tool to create the(?)e-cavity of precision forging process on bar-extrusion,head-upset,preforging and finish-forging;By sofeware DEFORM,the precision forging process has been simulated to amend the geometric model of desiging initially,the reasonable model can be attained finally.(2) Though the thermal simulation experiment of TA11,the relationship of the stress and strain has been studied with different processing parameters.Considering the effect of the friction to the stress,the exact true stress-strain curve of TA11 is abstained.The data has been prepared for creating material modeling when simulation is beginning.(3) Though the 3D thermal-mechanical simulation of the precision forging process of blade with different processing parameters.the temperature field,equivalent stress field. equivalent strain field and time-stroke curve have been analyzed under different conditions of the die velocity and friction to study the effect of different processing parameters in the precision forging of blade.The results show that:1) The most temperature and uneven deformation will increase as the die velocity raising technological parameters.Optimization values are as follows:die velocity 10mm/s.2) With increasing friction coefficient,material flow is poor,plastic deformation resistance increase,friction heat increase,the highest temperature rise.So selection of smaller coefficient of friction that the value is 0.1 is more reasonable.(4) Based on the3-D FEM numerical simulation on preforging,the different shape of perform ingot and size of perform ingot have been analyzed to study the effect of the forming result.The problem of necking down has been discussed.According to the results of 3-D FEM numerical simulation,it can get the best shape of perform ingot and size of perform ingot.(5) According to analog result with the process of finish-forging,the changes in the law of mesh picture,rheological picture of velocity vector and point tracking have been studied.The essential deformation in the forging process is:The distribution of deformation in the entire workpiece period is uneven;the forging process of blade is unsteady plastic flow process.(6) Optimized results of the simulation will be used to actual production,and both are analyzed.The results are basically the same.process routes and the establishment of processing parameters are correct and reasonable,analogy method that this text uses has the guidance meaning to real production.