第43卷第2期 Vol. 43No. 2
假压技木
FORGING & STAMPING TECHNOLOGY
大尺寸三维曲面件多点分段成形技术彭赫力12，于亚平，李明哲3，李中权",2
2018年2月 Feb.2018
（1.上海航天精密机械研究所，上海201600；2.上海金属材料近净成形工程技术研究中心，上海201600；
3.吉林大学无模成形技术开发中心，吉林长春130022）
限元模型，闸述了多点分段成形流程，得到了双曲率凸面件多点分段成形和回弹结果。通过数值模拟分析了成形方向和过渡区长度对成形质量的影响，结果表明：从小端开始成形可以获得光顺的曲面和均匀的等效应变；过渡区长度越大，成形件表
验证了数值模拟的有效性和多点分段成形技术的实用性，
关键词：大尺寸：三维曲面件；多点成形；分段成形；数值模拟 DOI: 10. 13330/j. issn. 1000-3940. 2018. 02. 006
中图分类号：TG306
文献标识码：A
文章编号：1000-3940（2018）02-0029-05
Multi-point sectionalformingtechnologyforthreedimensional surface
parts with large size
Peng Heli'-, Yu Yaping', Li Mingzhe', Li Zhongquan'?
(1. Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China;
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3. Dieless Forming Technology Center, Jilin University, Changchun 130022, China)
Abstract : The principle of multi-point sectional forming for three dimensional surface parts with large size was introduced, and the materi-al property parameters of aluminum alloy LF6 were tested. Then, the finite element model of multi-point sectional forming for double cur-vature convex part was built, the simulated procedure was elaborated, and the forming results and springhack results of double curvature convex part for multi-point sectional forming were acquired. Furthermore, the influences of forming direction and transitional length on the foming quality were analyzed by numerical simulation. The results show that the smooth surface and uniform equivalent strain can be got by forming from the small end. However, the larger the transitional length is, the better the surface aceuracy and uniform strain are, and the strain distribution is more uniform. Finally, the multi-point sectional forming experiment of double curvature convex part with large size was carried out, and the experiment part with good shape contour and surface accuracy was obtained. Thus, the validity of numerical simulation results and the practicability of multi-point sectional forming technology were verified.
Key words : large size; three dimensional surface parts; multi-point foming; sectional forming; numerical simulation
航天是一项具有国际竞争性的事业，其发展水平代表若一个国家的综合国力和科技水平。运载火前是航天的重要组成部分，是开发宇审空间资源、发展空闻科学技术的重要手段和工具，直接体现个国家航天技术的先进性
运载火箭箭体结构主要由推进剂贮箱、铆接舱收稿日期：20170812；修订日期：20171030
基金项目：上海市青年科技启明星计划项目（16QB1400800）
作者简介：影辨力（1986-），男，博士，高级工程师 E-mail: phl12616040811@ 126. com
通讯作者：李中权（1964-），男，学士，博士生导师万方整据al：lizhongquan401@163.com
段、整流罩等部分构成。推进剂贮箱由箱底和筒段组成，其中箱底呈椭球曲面，由多个瓜瓣和顶盖拼焊而成。近年来，世界航天强国纷纷启动重型运载火箭研制计划。目前，中国也在加紧研制直径达@10m的重型运载火箭，其瓜瓣尺寸将远远大于现役运载火箭瓜瓣尺寸。航空航天领域大尺寸三维曲面件成形的主要方式有拉深成形、蝠变成形和喷丸成形等，传统刚模拉深工艺简单，所需设备尺寸与吨位大、模具制造成本高；蝠变成形单件模具简单，成形效率低；喷丸成形柔性程度高、表面存在凹坑、后续机加工工作量大。因此，需要寻找新的柔性化成形方法来实现超大尺寸三维曲面件成形。