锻压技术

辊轮数量对辊挤成形筒体件质量的影响

英文标题：Influence of roller number on quality of cylinder parts in roll extrusion forming

作者：孙豪张宝红李旭斌张治民段志勇

单位：1.中北大学材料科学与工程学院精密成形中心山西太原 030000 2.新乡市特美特热控技术股份有限公司河南新乡453000

分类号：TG335；TG376.2

出版年,卷(期):页码：2019,44(5):73-81

摘要：

为研究辊轮数量对曲线回转外形筒体件辊挤成形表面质量的影响，利用Deform3D软件，对二辊、三辊和四辊辊挤成形进行了数值模拟。模拟结果表明，随辊轮数量增加，在同一平面内，辊边距型槽圆弧中心距离变短，辊边与型槽圆弧中心线速度更接近，金属变形更同步，变形更均匀。第1道次辊挤成形后，二辊辊挤工件口部极不平整，金属充满飞边槽后流入辊缝形成薄飞边，整形时出现折叠;三辊和四辊辊挤件口部较为平整，金属没有充满型槽，也没有流入辊缝。第2道次辊挤整形后，三辊、四辊辊挤工件未出现折叠、裂纹等缺陷。三辊辊挤时，金属流入飞边槽体积最少，故辊挤后工件长度最长。随着辊轮数量的增加，辊轮所受径向力呈减小的趋势，四辊受力最小。

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.

基金项目：

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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