锻压技术

气门成形过程数值模拟与挤压模具结构优化

英文标题：Numerical simulation on valve forming process and structure optimization on extrusion mold

作者：陈磊王廷坤王宗申崔来胜朱立华

关键词：气门挤压模锻过渡圆角模具磨损

分类号：TG316

出版年,卷(期):页码：2020,45(9):105-112

摘要：

通过DEFORM-3D建立汽车发动机气门成形过程的有限元模型，对气门挤压和模锻过程进行数值模拟，分别对变形过程中坯料的金属流动规律、温度、等效应变和模具的温度、等效应力、磨损深度进行分析。结果表明，模具过渡圆角处温度和应力集中，磨损情况最为严重。通过改变过渡圆角半径，对挤压模具结构进行优化，得到最佳优化方案。当挤压模具的过渡圆角半径取16 mm时，挤压模具和模锻模具的磨损情况同时改善，模具寿命显著提高。同时，模拟结果与气门锻件金相组织的观察结果基本一致，从而验证了有限元模型及优化过程的合理性与可靠性，可为气门的实际生产提供指导。

The finite element model of automobile engine valve forming process was built by DEFORM-3D, and the extrusion and die forging processes of valve were numerically simulated to analyze the metal flow rule, temperature and equivalent strain of billet and the temperature, equivalent stress and wear depth of mold during the forming process. The results show that the temperature and the stress at the transition fillet of the mold concentrate, and the severe wear occurs. And the structure of extrusion mold is optimized to obtain the optimum scheme by changing the radius of transition fillet. When the transition fillet radius of extrusion mold is 16 mm, the wear of extrusion and die forging molds is simultaneously improved, and the mold life is greatly increased. In addition, the simulation results agree very well with those of optical microstructure observation of valve forging, which verifies the reasonability and reliability of finite element model and optimization process to provide guidance for the practical production of valve.

基金项目：

淄博市校城融合发展计划项目 (2018ZBXC037)

陈磊(1997-)，男，硕士研究生 E-mail：gtchenlei@163.com 通讯作者：王宗申 (1986-)，男，博士，讲师 E-mail：wangzsh@sdut.edu.cn

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