Transactions of Materials and Heat Treatment

Title：Optimization on rotary forging process of hollow gear shaft based on Forge

Authors： Zhou Zhiming Luo Tianxing Zhou Kunfeng Tu Jian Huang Weijiu Wang Hongchuan Luo Rong Fang Feisong Cao Minmin

Unit： Chongqing University of Technology Jiangsu Chongqing Jianshe Industry (Group) Co. Ltd.

KeyWords： hollow gear shaft rotary forging orthogonal test microstructure microhardness Forge

ClassificationCode：TG174

year,vol(issue):pagenumber：2018,43(4):27-32

Abstract：

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.

Funds：

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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