Transactions of Materials and Heat Treatment

Title：Influence of roller number on quality of cylinder parts in roll extrusion forming

Authors： Sun Hao1 Zhang Baohong1 Li Xubin1 Zhang Zhimin1 Duan Zhiyong2

Unit： 1. Precision Forming Center School of Materials Science and Engineering North Central University Taiyuan 030000 China 2. Xinxiang Temet Thermal Control Technology Co. Ltd. Xinxiang 453000 China

KeyWords： roll extrusion forming rotary curved shape cylinder parts roller burr

ClassificationCode：TG335；TG376.2

year,vol(issue):pagenumber：2019,44(5):73-81

Abstract：

In order to study the influence of roller number on the surface quality of cylinder parts with rotary curved shape, the roll extrusion forming processes with two rollers, three rollers and four rollers were simulated by software Deform3D. The results show that with the increasing of roller number, in the same plane, the distance between roller edge and circular arc center of groove becomes shorter, the speed of roller edge is closer to the speed of circular arc center of groove, the metal deformation is more synchronous, and the deformation is more uniform. After the first roll extrusion with two rollers, the mouth of workpiece is extremely uneven, and the metal fills the flash groove and then flows into the roll gap to form a thin flash edge, which is folded during shaping. However, the roll extrusion with three rollers and four rollers are relatively flat, the metal does not fill the groove and does not flow into the roll gap. After the second roll extrusion with three rollers and four rollers, folding and cracking do not appear. During the roll extrusion with three rollers, the metal flows into the flash groove with the least volume, 〖JP3〗so the length of workpiece is the longest after roll extrusion. With the increasing of roller number, the radial force acting on rollers tends to decrease, and the force acting on four rollers is the smallest.

Funds：

国家自然科学基金资助项目 (51775519)；中北大学科研创新团队支持计划资助（201601）

作者简介：孙豪（1991-），男，硕士研究生 Email：sunhaoyuni@163.com 通讯作者：张宝红（1971-），男，博士，教授 Email：zhangbh@nuc.edu.cn

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