锻压技术

闭挤式精冲直齿轮时塌角的形成与控制

英文标题：Forming and control of collapse angle for the closed-extruding fine-blanking spur gear

作者：吕琳马一龙刘潞周邓明

单位：重庆理工大学

分类号：TG381

出版年,卷(期):页码：2015,40(3):32-35

摘要：

为了研究闭挤式精冲直齿轮时产生塌角的原因，通过有限元模拟和网格实验的方法，分析了闭挤式精冲直齿轮齿顶端和齿根端材料的流动特点，研究了精冲过程中的反顶力、分流降压腔和外环填充率对塌角成形的影响规律。结果表明：由于摩擦力引起的材料流动不均匀而导致直齿轮塌角的出现。塌角高度与反顶力、坯料外环填充率成反比，和分流降压腔成正比关系。因此，在闭挤式精冲过程中，适当增加挤压反顶力和坯料外环填充率大小，减小坯料分流降压腔尺寸可以有效减小塌角高度。

To study the reason of collapse angle formed in fine-blanking spur gear, the characteristics of material flow in the tooth top and tooth root of the spur gear were analyzed by finite element simulation and grid experiment. The influences of the counterforce, bypass reducing pressure chamber and outer ring filling rate on the forming collapse angle in the process of the closed-extruding fine-blanking were investigated. The result shows that the unevenness of the material flow caused by friction results in the occurrence of collapse angle. The collapse angle height is inversely proportional to the counterforce and the outer ring filling rate, and is proportional to the bypass reducing pressure chamber. Therefore, to increase counterforce and the outer ring filling rate, and to decrease the size of the bypass reducing pressure chamber can reduce the collapse angle height effectively in the process of closed-extruding fine-blanking spur gear.

基金项目：

国家自然科学基金资助项目（51375521）；重庆市模具技术重点实验室开放课题基金资助项目（MT201502）

吕琳（1968-），女，硕士，教授通讯作者：马一龙（1989-），男，硕士研究生

参考文献：

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