高强钢热冲压模具冷却系统工艺参数优化

Optimization of Process Parameters of Hot Stamping Tool Cooling System for High Strength Steel

为研究热冲压模具冷却系统的工艺参数对热冲压模具温度的影响规律,基于Fluent软件建立了流—固—热耦合的连续热冲压有限元模型。分别对不同的管道间距,不同的管道中心距模面距离以及几种冷却水流速度进行了连续热冲压仿真,获得了不同工艺条件下模具的温度变化及工艺参数对模具达到热平衡状态时的冲压次数、模具温度以及均匀性的影响规律。仿真结果表明:增大管道间距和距模面距离,冷却系统的冷却效率降低,模具达到热平衡状态时温度越高;增大管道中心距模面距离,模面温度分布越均匀;热冲压生产过程模具内冷却水流应保持紊流状态;最后,通过连续热冲压实验验证了有限元仿真的可靠性。

To study the influence of hot stamping tool temperature under different process parameters in hot stamping,a finite element model of continuous hot stamping coupled with fluid,solid and thermal was established based on Fluent software. The simulations included different cooling water channel distances,different distances between channel center and tool surface and several kinds of cooling water velocities of 0. 1,0. 5 and 1. 0m / s,which achieved the results of temperature variation process under different process conditions,and change laws of stamping times,tool temperature and homogeneity with different process parameters at thermal equilibrium state. Results showed that the cooling efficiency of cooling system decreased and the temperature at thermal equilibrium state of stamping tool raised with distances between channels and distances between channels and tool surface increasing; temperature distribution of tool surface was more homogeneous with distances between channel center and tool surface increasing; turbulent condition should be keep in cooling system. Finally the simulations were verified by a continuous hot stamping experiment.