锻压技术

汽车底板热锻模具结构优化

英文标题：Structural optimization of hot forging die for car backplane

作者：王宇晓李霞孙礼宾付科

分类号：

出版年,卷(期):页码：2014,39(7):121-125

摘要：

针对汽车底板热锻模具模膛较深并且狭窄，生产过程中锻件冷却快,模具容易发生断裂失效、顶杆磨损、出模困难等问题，利用Deform软件对原始锻模进行数值模拟。分析结果表明，汽车底板外形复杂、模腔深且窄，导致模具应力较大，容易发生断裂；顶杆孔位置不合理，导致顶杆易磨损，锻件顶出困难。通过采用优化模具成形面结构、调整顶杆孔位置及改进工序等方法，使预锻模具应力和终锻模具应力分别降低200和120 MPa。实际生产中，模具寿命由试制时的40件左右提高到现在的3705件以上，同时生产效率得到提高，出模也较容易。

As the hot forging die cavity of car backplane is deep and narrow,the cooling of forgings is fast in manufacturing process，and the fracture failure，mandril wear and demolding hardly etc. which are easily occurred in die，and the corresponding reasons were analyzed by simulating the original forging die using Deform.The reasons are as follows：complicated car backplane, deep and narrow die cavity make the die have bigger stress and tend to fracture；unreasonable position of mandril hole makes the mandril tend to wear and demold hardly. The stress of preforging die and final forging die are respectively decreased by 200 and 120 MPa by optimizing forming surface structure of die, adjusting mandril hole position and improving process.The die life is raised from around 40 products at trail time to more than 3705 ones. Production efficiency is raised and demolding is more easy.

基金项目：

上海市高校与上海中小企业产学合作项目（12QY20）；联盟计划难题招标专项资助项目（LM201275）；上海工程技术大学研究生科研创新资助项目(13KY0518)

王宇晓（1990-），男，硕士研究生

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