锻压技术

基于Forge的空心齿轮轴毛坯旋锻工艺优化

英文标题：Optimization on rotary forging process of hollow gear shaft based on Forge

作者：周志明罗天星周昆凤涂黄伟九

分类号：TG174

出版年,卷(期):页码：2018,43(4):27-32

摘要：

通过设计正交试验，利用Forge仿真分析，获得空心齿轮轴旋锻成形的优化工艺参数组合，并对试制样件进行了显微组织和显微硬度的物理检验。通过正交试验获得的最终优化方案为：坯料的初始温度为830 ℃，轴向相对送进量为0.05 mm，坯料转速为76 r·min-1，锤头径向压下量为2 mm，锤头径向速度为7.5 mm·s-1。物理检验表明：随着变形量的增加，空心齿轮轴的晶粒越细化，从表层向内晶粒细化先增强后逐渐减弱；旋锻成形使空心齿轮轴获得了纤维组织，提高了致密性；由于第2台阶处径向截面的变形比第1台阶处大，所以第2台阶处的表面显微硬度比第1台阶处大。

The optimum process parameters of rotary forging for hollow gear shaft were obtained by orthogonal test design based on Forge simulation analysis, and the microstructure and microhardness of trial samples were examined by physical examination. The final optimization scheme was obtained by orthogonal test with the initial temperature of billet of 830 ℃, the relative axial feeding of 0.05 mm,the rotation rate of billet of 76 r·min-1, the hammer radial reduction of 2 mm and the hammer radial velocity of 7.5 mm·s-1. The physical examination shows that the grain size of hollow gear shaft becomes more refined with the increasing of deformation, and the grain refinement becomes stronger and then decreases from the surface to the inside. Furthermore, the rotary forging makes the hollow gear shaft obtain fibrous microstructure to improve the compactness. As the deformation in radial section of the second step is larger than that of the first step, the surface microhardness of the second step is greater than that of the first step.

基金项目：

重庆市科技计划重点项目（cstc2018jszx-cyz0542);重庆市第八届“科慧杯”资助项目（08112017）；重庆市巴南区科研基金项目（2015TJ08）

周志明（1976-），男，博士，教授；E-mail：zhouzhiming@cqut.edu.cn

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