Plastic Forming Process Analysis Of High Speed Train Hub Brake Disc

As an important part of the brake system,the manufacturing materials of the High speed train hub brake disc generally have good wear resistance,thermal fatigue,thermal conductivity and thermal creep resistance.Compared with cast brake discs,forged steel brake discs have better organization and performance,and become the mainstream brake discs adopted by high speed trains nowadays.The traditional forging process has disadvantages such as insufficient power,severe damage to the lower die and poor production environment.Taking the brake disc of a High speed train hub in a Qingdao company as the research object,This paper put forward a new scheme for forming the brake disc with the diameter axial rolling ring forming and finishing rotary forming,and carry out the numerical simulation of the final forming of the die forging and the final forming of the rotary forging.The process and the results of the main process parameters are further analyzed and the optimum parameters are determined.In view of the requirements for the blanks and the problems existing in the traditional radial rolling ring,this paper carry out the numerical simulation of the process of two-way ring rolling.The effect of the process parameters on the depth of the concave pit in the two ends of the before and after the axial rolling and shaping is analyzed,and the optimization is made.In the process of designing the final forming for the brake disc,the die and blank of the die forging and swinging forming are designed according to the part drawing the hot forgings,and the related technological parameters are determined.The relevant numerical simulation models are established and the key technologies such as grid division and boundary condition are set.The numerical simulation of the rmomechanical coupling is done by Deform-3D numerical simulation software.The simulation results show that compared with die forging,rotary forging has advantages of easier blank filling,smaller load and more uniform Deformation.The initial forging temperature,the rotating speed,the swing angle and Per rotation feed will have influence on the forming process of the brake disc.Therefore,It is studied that the effect of the process parameters about the filling effect,the bearing load of the pendulum,the stress strain field of the fin,the velocity field of the workpiece,the surface velocity field and the temperature field in the process of swinging and plastic forming.Combined with production practice,the optimum parameter is selectedIn the process of designing billet,the numerical simulation scheme of billet size and diameter axial ring rolling ring is designed according to the ring rolling principle.By studying the Deformation and heat transfer law in the Diameter axial ring rolling process,and verifies the feasibility of the diameter axial bidirectional ring rolling and the superiority to the prevention of the tail defect of the axial end.The results show that the sensitivity of the fish tail defect to the feed speed and the forging temperature is reduced when the diameter axial bidirectional ring rolling ring is processed,which makes the selection of the two process parameters more extensive.