Springback compensation by stress superposition in forming of ultra high-strength steel sheets

超高强度钢板成形中的应力叠加回弹补偿

基本信息

批准号：
396455913
负责人：
Professor Dr.-Ing. Mathias Liewald
金额：
--
依托单位：
Institut für Umformtechnik (IFU)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/396455913?language=en
关键词：
Springback compensation stress superposition forming

项目摘要

Today, the automotive industry is challenged by increasing environmental regulations as well as the continuous enhancement of the standard requirements regarding passengers safety. In order to achieve these requirements in car industry, the focus has been put on the reduction of car body weight through the use of lightweight materials as well as sheet metals with smaller thicknesses. Such tendencies lead to the increased use of ultra-high-strength steels (UHSS) for manufacturing of car body components. The structural car body components usually are manufactured by stretching or deep drawing. When the part is taken out of the die cavity after the forming process, a stress relaxation happens to reach a state of appropriate stress balance in the part. As a result of this stress relaxation, the springback or certain deviation between the formed part and the reference geometry occurs. Different kinds of springback can arise in this case: angle change, sidewall curl, radii change, and torsion or twisting. When forming car body structural parts from UHSS, an extremely high amount of springback can be expected. In state of the art exist some mechanically and geometrically based approaches which have shown certain possibilities for springback reduction. However, a methodology for springback compensation by parts manufactured from UHSS has not been developed until now.The motivation of this research results from the lack of such a methodology to compensate the springback when forming the parts from UHSS. For a successful development of such a kind of methodology for springback compensation, firstly, a dependency between the acting stresses after the forming and consequently caused part shape deviations or springback must be defined. The mentioned dependency should be described by a mathematical function. With the knowledge of this dependency between the stresses caused in the part and, therefore, occurred springback, a methodology for stress based springback compensation will be defined. Firstly, the compensation methodology to be developed will be based on dedicated stress superposition during the novel forming process with an alternating blank draw-in, and afterwards, if necessary, by changing the part cross-section size in certain part areas in the same tool. The required modification of the parts cross-sections will be provided by corresponding stretching without blank draw-in or by reduction of the drawing depth using back forming.

如今，通过增加环境法规以及对乘客安全的标准要求的持续增强，汽车行业受到挑战。为了在汽车行业达到这些要求，重点是通过使用轻质材料以及厚度较小的金属来减轻汽车体重。这种趋势导致超高强度钢（UHSS）的使用增加，用于制造汽车车身组件。结构性汽车车身组件通常是通过拉伸或深图制造的。当成型过程后，将零件从模具腔中取出时，压力放松就达到了零件中适当的应力平衡状态。由于这种压力放松，出现了形成的部分与参考几何形状之间的回弹或某些偏差。在这种情况下，可能会出现不同种类的回弹：角度变化，侧壁卷曲，半径变化，扭转或扭曲。当从UHSS形成汽车车身结构部件时，可以预期会有极高的弹回。在艺术的状态下，基于机械和几何的方法存在，这些方法表明了减少春回的某些可能性。但是，直到现在，尚未开发一种从UHSS制造的零件来进行回弹补偿的方法。这项研究的动机是由于缺乏这种方法来补偿从UHSS组成零件时补偿弹回的方法。为了成功地开发这种用于回弹补偿的方法，首先，必须定义形成后的表演应力与导致部分形状偏差或浮回的依赖性。提到的依赖性应通过数学函数描述。随着对零件引起的应力之间的这种依赖性的了解，因此发生了回避，将定义基于压力的弹回补偿方法。首先，要开发的补偿方法将基于在新颖的过程中使用交替的空白绘制过程中的专用应力叠加，并在必要时通过更改同一工具中某些部分区域的零件横截面大小。所需的零件横截面的修改将通过相应的拉伸而无需空白绘制或使用背面形成减少图形深度。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Kompensationsstrategien von Rückfederungseffekten beim Umformen von hochfesten Stahlblechwerkstoffen

高强度钢板材料成形时回弹效应的补偿策略

DOI：
10.18419/opus-11070
发表时间：
2020
期刊：
影响因子：
0
作者：
Radonjic
通讯作者：
Radonjic

Compensating the springback of ultra-high-strength steel parts by specific stress superposition during sheet metal forming

通过板料成形过程中比应力叠加补偿超高强钢零件的回弹

DOI：
10.1088/1757-899x/1157/1/012037
发表时间：
2021
期刊：
IOP Conference Series: Materials Science and Engineering
影响因子：
0
作者：
Radonjic;Liewald
通讯作者：
Liewald

Enhanced accuracy in springback prediction for multistage sheet metal forming processes

提高多级钣金成型工艺回弹预测的准确性

DOI：
10.1007/978-3-662-60417-5_11
发表时间：
2019
期刊：
Production at the leading edge of technology
影响因子：
0
作者：
Briesenick;Liewald;Radonjic;Karadogan
通讯作者：
Karadogan

Prediction and reduction of springback in 3D hat shape forming of AHSS

DOI：
10.1016/j.promfg.2018.07.296
发表时间：
2018-01-01
期刊：
PROCEEDINGS OF THE 17TH INTERNATIONAL CONFERENCE ON METAL FORMING METAL FORMING 2018
影响因子：
0
作者：
Konzack, Stefan;Radonjic, Ranko;Altan, Taylan
通讯作者：
Altan, Taylan

New process design for reduction of springback by forming with alternating blank draw-in

通过交替毛坯拉深成形减少回弹的新工艺设计