管壁螺纹槽渐进成形的变形与缺陷分析  

Thread Grooving Deformation and Defect Analysis of Thin-Walled Tubes During Incremental Forming

作　　者：唐浩兴 杨帆[1] 路胜海 刘龙琴 周银 郑宇[1] 温彤[1] TANG Haoxing;YANG Fan;LU Shenghai;LIU Longqin;ZHOU Yin;ZHENG Yu;WEN Tong(Chongqing University,Chongqing 400044,China;HBIS Group Co.,Ltd.,Shijiazhuang 050023,China)

机构地区：[1]重庆大学,重庆400044 [2]河钢集团有限公司,石家庄050023

出　　处：《航空制造技术》2022年第10期89-93,共5页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(51575066);重庆市基础研究与前沿探索专项(cstc2020jcyj–msxmX0420)。

摘　　要：基于单点渐进成形原理,以外径38mm、壁厚1mm的Al6061管为对象,应用物理试验和数值模拟方法研究了管壁螺纹槽渐进成形的变形特点、壁厚分布及回弹现象。利用Glock铰链模型分析了壁厚变化规律,探讨了槽深度、间距和进给量等对回弹的影响。结果表明,该渐进成形工艺可实现薄壁管螺纹槽的柔性加工,实际成形的槽间距参数与设计误差在6%以内;随着槽深度增加,管壁减薄加剧,但螺纹槽内壁厚由于变形的“铰链”效应,底部反而可能增厚;管壁回弹量随着螺纹槽深度和工具头单次进给量增加而增大,其中单次进给量为0.25mm,比1.5mm时的回弹量减少约40.2%。此外,较小槽间距(Δl)可使临近材料反复变形并提高结构的局部刚度,有抑制回弹的作用,其中Δl=10mm比Δl=50mm时管壁回弹量减小约38.5%。According to the principle of single-point incremental forming,experiment and numerical simulation were employed to study the deformation features,thickness distribution and springback during incremental thread grooving on thin-wall tubes,where Al6061 tubes with outer diameter of 38mm and thickness of 1mm were used.The wall thickness variation was discussed by using Glock’s hinge model,and the effects of groove depth,spacing and feed rate on springback were clarified.Results show that incremental tube grooving on tubular parts can meet the demand of flexible manufacturing,and the errors of groove spacing between the experiment and expectation are within 6%.With the groove depth increasing,wall thinning intensifies,but due to the hinge effect the bottom wall thickness may increase.The springback of tube wall increases with a deeper groove and a larger single step size of tool head,the springback decreases about 40.2% when the single step size is 0.25mm compared with 1.5mm.In addition,the materials near the grooves may deform repeatedly and the local structural stiffness will improve under a small groove spacing(Δl),which can inhibit springback,the springback decreases about 38.5%whenΔl is 10mm compared with 50mm.

关 键 词：渐进成形 薄壁管 螺纹槽 变形 回弹 

分 类 号：TG306[金属学及工艺—金属压力加工]