锻压技术

内斜齿轮冷挤压成形工艺方案

英文标题：Cold extrusion forming process of internal helical gear

作者：冯文杰刘吉陈莹莹周凤

单位：重庆理工大学

分类号：TG376

出版年,卷(期):页码：2019,44(4):95-100

摘要：

首先对内斜齿轮的几何特点进行分析，并针对内斜齿轮在冷挤压成形时存在的成形力过大、成形质量差、挤压件脱模困难等技术难点，提出了采用浮动凸模的工艺方案。利用有限元软件 DEFORM-3D，对空心坯料冷挤压工艺进行数值模拟分析,分别研究了坯料内孔直径、入模半角和定径带长度对挤压成形载荷和性能的影响。研究结果表明：当坯料内孔直径尺寸为Φ72.5 mm、入模半角选取45°、定径带长度为20 mm时，内斜齿轮齿形充填均匀，齿形饱满，成形载荷也相对较小。采用浮动凸模的工艺进行内斜齿轮冷挤压成形工艺试验，证明了该工艺方案的可行性和数值模拟结果的正确性。

Firstly，the geometric characteristics of internal helical gear were analyzed, and a process scheme with floating punch was proposed for the technical difficulties in cold extrusion forming of internal helical gears，such as excessive forming force，poor forming quality and difficult demolding of extruded parts. Then, the cold extrusion process of hollow billet was simulated by finite element software DEFORM-3D，and the influences of the inner hole diameter of billet，the half angle into mold and the length of sizing belt on the extrusion forming load and properties were studied, respectively. The results show that when the inner hole diameter of billet is Φ72.5 mm，the half angle into mold is 45°，and the length of sizing belt is 20 mm，the internal helical gear is uniformly filled，the tooth shape is full，and the forming load is relatively small. Thus, the cold extrusion forming experiment of internal helical gear with floating punch shows the feasibility of the process scheme and the correctness of the numerical simulation results.

基金项目：

重庆市科委资助项目 (cstc2014yykfA60001);重庆市教委科学技术研究资助项目(KJ1400944)

冯文杰(1964-)，男，硕士，教授 E-mail：wjfeng@cqut.edu.cn 通讯作者：刘吉(1994-)，男，硕士研究生 E-mail：1908721652@qq.com

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