Design And Optimization Of Cooling System For Multi-channel Hot Stamping Die

The application of high-strength steel has better resolved the contradiction between the strength and cost of auto parts.However,the difficulty of forming highstrength steel affects its application.With the popularization of hot stamping forming technology,the difficulty of forming high-strength steel is greatly reduced,making the wide application of high-strength steel possible.In the hot stamping process,the temperature of the sheet material needs to be reduced as uniformly and quickly as possible,which puts forward strict requirements on the design of the cooling system in the hot stamping die.This paper takes the cooling system of the multi-channel hot stamping die as the research object,model the cooling system of different pipe layouts for the die and use Fluent to simulate and analyze it.According to the Fluent analysis result,Isight software is used to optimize the cooling system.First,through the establishment of cooling systems with various pipe layouts,the simulation analysis of cooling systems under different layouts is carried out,and the speed and uniformity in different pipes are compared under the premise of the same flow.Determine the water channel arranged in parallel,the unevenness of the internal cooling water flow rate is much higher than that of the traditional arrangement and series arrangement.Use Fluent to analyze the heat transfer of different cooling systems and compare their cooling speed and uniformity.It is determined that the cooling effect of the cooling system arranged in the longitudinal direction is better than that in the horizontal arrangement,and the cooling effect is the best in the traditional longitudinal arrangement.Secondly,choose a mold with a traditional horizontal pipeline layout and establish a parametric model.According to the energy balance method and strength requirements,determine the value range of the design parameters.With the Optimal Latin hypercube design method,use Isight to do DOE and get the parameters about the mold surface temperature.According to the data of design parameters and response parameters,choose different methods to establish approximate models and verify the credibility,compare the value of R-Squared of different response parameters,and determine the approximate model with the highest degree of fit as the response surface methodology.The multi-objective particle swarm algorithm is used to optimize the design parameters.Optimization result shows that the surface mold surface temperature and its consistency are improved to varying degrees.Finally,the connection plate of the rear longitudinal beam of the automobile was tested and compared with simulation.The temperature of the plate before and after quenching in the test was measured and compared with the simulation analysis.The results show that the surface temperature of the sheet metal is similar in the experiment and the simulation,so that the reliability of the heat transfer analysis simulation can be verified.