刘迪辉?覮,杨三思,高鹤萱,张银海,郭照宇.考虑实际流场的热冲压模具模温分析方法[J].湖南大学学报:自然科学版,2020,(6):7~13
考虑实际流场的热冲压模具模温分析方法
Mold Temperature Analysis Method of Hot Stamping Die Based on Actual Flow Field
  
DOI:
中文关键词:  热冲压  流场  对流传热系数  冷却系统  温度场分布
英文关键词:hot stamping  flow fields  convective heat transfer coefficients  cooling systems  temperature distribution
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作者单位
刘迪辉?覮,杨三思,高鹤萱,张银海,郭照宇 (1. 湖南大学 机械与运载工程学院湖南 长沙 4100822. 上海博汇模具有限公司上海 201815) 
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中文摘要:
      针对复杂成形件的热冲压模具提出一种考虑流场分布差异影响的模温分析方法. 通过Fluent流场分析计算出冷却水道管壁各节点处的对流传热系数,计算过程中考虑了水道结构所导致的流场分布差异对传热能力的影响;利用LS-DYNA完成板料成形及保压淬火过程的仿真模拟,获取板料上的温度数据;以A柱边梁为研究对象将仿真分析结果同热冲压生产线上的实际冷却效果进行对比. 结果表明,考虑流场影响的模温分析结果中高温区域的分布和实测一致,12个温度监测点处最大温度误差为3.6 ℃,平均温度误差为0.96 ℃,而采用平均传热系数的仿真中温度分布及最大温差点发生改变,监测点最大温度误差为9.1 ℃,平均温度误差为4.96 ℃. 仿真与试验对比表明:流速的改变对传热系数的影响显著,基于流场分析的模温分析方法考虑了热冲压模具冷却水道中流速差异性分布的影响,能够用于复杂零件及多腔模具的模温分析.
英文摘要:
      A mold temperature analysis method for the hot stamping dies of complex formed parts considering the influence of different flow field distribution is proposed. First, the convective heat transfer coefficients at each node of the cooling water pipe wall were calculated by Fluent flow field analysis, and the influence of the differences in the flow field distribution caused by the water channel structure on the heat transfer capacity was considered in this process. Then, the processes of sheet forming and holding and quenching were simulated by LS-DYNA to obtain the temperature data of the blank. Finally, the A-pillar side beam was used as the research object to compare the simulation analysis results with the actual cooling effect on the hot stamping production line. The results show that the distribution of high temperature areas in the analysis result of the mold temperature based on the flow field analysis is consistent with the actual measurement. The maximum error at the 12 temperature monitoring points is 3.6 ℃,and the average error is 0.96 ℃. However, the temperature distribution and the maximum temperature difference point change in the simulation using the average heat transfer coefficient. The maximum error of the monitoring point is 9.1 ℃,and the average error is 4.96 ℃.The comparison between the simulation and experiment shows that the change of the flow rate has a significant effect on the heat transfer coefficient, and the mold temperature analysis method based on flow field analysis takes into account the effect of the differential distribution of the flow rate in the cooling channel of the hot stamping mold,which can be used for the analysis of mold temperature of complex parts and multi-cavity molds.
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