文档介绍：哈尔滨工业大学工程硕士学位论文
摘要
热冲压成形工艺是将加热至奥氏体后的钢板进行成形并保压、淬火的新型
复杂板材成形工艺,可以实现高强度复杂零件的成形,有效地解决高强钢板件
室温成形存在容易开裂、起皱、回弹大等缺陷。高强钢板由于比强度高、综合
力学性能好,在同等安全系数下,可以有效的减轻汽车重量,在汽车行业中得
到广泛应用。汽车前地板为车室前部的汽车驾驶席的地板结构件,对汽车的稳
定性、安全性以及舒适性起着重要作用,是汽车的关键部件之一。研究汽车前
地板热冲压成形模具及冷却系统设计关键技术和工艺参数对冷却效果的影响规
律,在扩展热冲压成形技术在工程中的应用和推动热成形工艺的发展方面,具
有重要的意义。
借鉴冷冲压成形模具设计经验,用 CATIA 建立了汽车前地板的热冲压成
形模具三维模型,结合前地板的型面特点,采用型腔式和钻孔式相结合的方
式。设计了汽车前地板热冲压成形模具及其冷却系统,使其强度满足要求。
依据流体动力学原理,结合共轭传热理论,建立了有限元仿真模型。采用
流体仿真分析软件 CFX 进行多工艺循环下的汽车前地板保压淬火阶段的数值
模拟。通过模拟分析,验证了模具及冷却系统设计方案的合理性。分析了冷却
水流速、保压力、保压时间、工艺循环次数等工艺参数对热冲压模具、热成形
件冷却效果的影响规律。确定了汽车前地板热冲压成形的合理工艺参数。
研究表明:汽车前地板热冲压成形时,合理的冷却水流速应不小于 5 m/s,
保压力应不小于 30 MPa,保压时间不小于 10 s;经历五次工艺循环后,模具的
温度趋于稳定。
关键词: 汽车前地板;热冲压成形;冷却系统;共轭传热;仿真分析
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哈尔滨工业大学工程硕士学位论文
Abstract
As an innovative forming process for High strength steel(HSS), hot stamping with
integrated heating, forming and quenching in one process, can effectively soften the blank
and prevent it from cracking and wrinkling. Because of the phase transformation of
austenite to martensite within the stamping operation, the blank can acquire substantial
high tensile and yield strength. Under the same safety conditions, HSS can effectively re-
duce vehicles weight due to its high specific strength and prehensive mechanical
properties. HSS is widely used in the automotive industry. Automotive front floor(AFF)
is one of the ponents of the car which located in the partment of the
car, plays an important role in the stability, security fort. Design the hot stamping
mold of AFF and the cooling system, research on the influence law of the crucial pro-
cess parameters to the quenching effect. It is of great significance to promotion in the
development of the hot forming process and applications in engineering.
Learning from the cold stamping mold design experience, design the hot stamping
mold of AFF with CATIA. According to surface characteristics of AFF, design the cooling
system with the method of bination of cavity-type an