摘要
针对多腔热冲压模具冷却水流量分配问题,提出一种冷却水流量分配方法.设计一个可变水道参数的U形件热冲压工艺仿真模型,基于FLUENT和LS-DYNA联合仿真对成形件温度随板料厚度、保压时间及型面流速的变化规律进行研究,建立流量分配数学模型.当零件目标温度确定后,根据所构建的流量分配数学模型可快速确定薄板件冷却所需具体流量,实现冷却水在各腔中的合理分配.以一模三腔的热冲压模具为研究对象,根据建立的流量分配数学模型对其外接水路的阀门开度进行调整,并将调整前后的结果进行对比,调整后厚板件门槛件的温度由160.4℃下降到150.1℃,下降了6.42%.研究结果表明,冷却水流量的调整对成形件最后温度有显著影响,采用多腔热冲压模具冷却水流量分配的方法,可以缩短整体的保压时间.
Aiming at the problem of cooling water flow distribution for multi-cavity hot stamping molds,a cool⁃ing water flow distribution method is proposed.A simulation model of the hot stamping process of U-shaped parts with variable channel parameters is designed.Based on the joint simulation of FLUENT and LS-DYNA,the variation law of the temperature of the formed parts with the thickness of the sheet,the holding time,and the velocity of the pro⁃file is studied,respectively.And the flow distribution of the mathematical model is established.When the target tem⁃perature of the part is determined,the specific flow rate required for cooling the thin plate can be quickly determined according to the constructed flow distribution mathematical model,and the reasonable distribution of cooling water in each cavity can be realized.Taking a one-mold three-cavity hot stamping mold as the research object,the valve opening of its external waterway is adjusted according to the established flow distribution mathematical model,and the results before and after the adjustment are compared.After the adjustment,the temperature of the thick plate threshold drops from160.4℃to 150.1℃with a drop of 6.42%.The research results show that the adjustment of the cooling water flow has a significant effect on the final temperature of the formed part.The method of cooling water flow distribution of the multi-cavity hot stamping mold can shorten the overall pressure holding time.
作者
刘迪辉
唐雪
杨三思
LIU Dihui;TANG Xue;YANG Sansi(College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China)
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第8期93-100,共8页
Journal of Hunan University:Natural Sciences
基金
湖南省自然科学基金资助项目(201631390158)。
关键词
热冲压
多腔模具
冷却系统
流量分配
hot forming technology
multi-cavity mold
cooling systems
flow distribution
