Design Of Cooling System Of Automotive Front Panel And Numerical Simulation Of Hot Stamping

Automobile front bafe, in front of the car, plays a timely role to protect the safetyof the driver when the car is sufered by collision. It belongs to the non-axisymmetricparts, undulating both sides, bulky. Cold-stamping technology using ordinary steel hasbeen unable to adapt to the lightweight and safety of the automobile; cold-stamping usinghigh strength steel is relatively easy to crack, wrinkle, rebound and so on. Hot stampingtechnology can improve the tensile strength, avoid the rebound, reduce the number ofparts and achieve light weight.Compared with the cold stamping, the hot stamping mold of Automobile front bafecombines the dual function of forming and quenching. In order to achieve the forming ofsheet, the design of the punch, die, guiding device, the positioning device, and the drawingdirection, stamping pressure calculation are based on experience of cold stamping mold;in order to achieve the quenching, I design intensive and distributed cooling pipes in themold, then determine the pipe diameter,water pipes spacing, distance between water pipeand mold surface.By fluid dynamics software, ANSYS CFX, the cooling efect of centralized anddistributed embedded cooling pipes is analyzed. The results show that the distributedcooling channels can increase the cooling rate, enhance the cooling uniformity, makesheet achieve martensite transformation. Internal cooling pipes result in mold strengthreducing, the mold strength can meet the strength requirements by the ANSYS staticanalysis module.On the basis of distributed cooling pipes, I study how the water flow rate, holdingpressure and other process parameters influence the temperature distribution on the moldand sheet, which provide the basis for a reasonable holding pressure and water flow rate.