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

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.
今天,汽车行业面临着越来越多的环境法规以及对乘客安全标准要求的不断提高的挑战。为了达到汽车工业的这些要求,人们把重点放在了通过使用轻质材料和较小厚度的金属板材来减轻汽车车身重量上。这种趋势导致越来越多的人使用超高强度钢(UHSS)来制造汽车车身零部件。车身结构件通常采用拉深或拉深的方法制造。当零件在成形过程后从模腔中取出时,应力松弛恰好在零件中达到适当的应力平衡状态。这种应力松弛的结果是,成形零件和参考几何图形之间会出现回弹或某些偏差。在这种情况下可能会出现不同类型的回弹:角度改变、侧壁卷曲、半径改变以及扭转或扭转。当用UHSS成形车身结构件时,可以预期回弹量极高。在现有技术中,存在一些基于机械和几何的方法,这些方法已经显示出降低回弹的某些可能性。然而,超高速钢零件回弹补偿的方法直到现在才被开发出来,本研究的动机在于缺乏这样一种方法来补偿超高速钢零件成形时的回弹。为了成功地开发这样一种回弹补偿方法,首先必须定义成形后的作用应力之间的相关性,从而导致零件形状偏差或回弹。所提到的依赖关系应该用数学函数来描述。了解零件中产生的应力和由此产生的回弹之间的这种相关性后,将定义一种基于应力的回弹补偿方法。首先,要开发的补偿方法将基于在新的成形过程中使用交替的毛坯拉深的专用应力叠加,然后,如果必要,通过改变同一工具中某些零件区域的零件横截面尺寸。所需的零件横截面修改将通过相应的拉伸来提供,而不需要毛坯拉深,或者通过使用后成形来减小拉深。

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
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
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
  • DOI:
    10.1016/j.promfg.2019.02.129
  • 发表时间:
    2019
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Radonjic;Liewald
  • 通讯作者:
    Liewald
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Professor Dr.-Ing. Mathias Liewald其他文献

Professor Dr.-Ing. Mathias Liewald的其他文献

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{{ truncateString('Professor Dr.-Ing. Mathias Liewald', 18)}}的其他基金

Development of a process for the two-stage production of gears
齿轮两阶段生产工艺的开发
  • 批准号:
    443284947
  • 财政年份:
    2020
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Production and characterization of complex folded cellular structures made of sheet metal
由金属板材制成的复杂折叠蜂窝结构的生产和表征
  • 批准号:
    427257349
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Production of bead-shaped parts by cold extrusion of semi-finished products fabricated by composite hot extrusion
复合材料热挤压制造的半成品冷挤压生产珠状零件
  • 批准号:
    404239924
  • 财政年份:
    2018
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Integration of functional elements in sheet metal components through deep-drawn double blanks
通过深拉双毛坯将功能元件集成到钣金部件中
  • 批准号:
    362037730
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Manufacturing of metal-ceramic Interpenetrating Phase Composites using semi-solid forming
利用半固态成型制造金属陶瓷互穿相复合材料
  • 批准号:
    392513301
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Hybrid interaction during and after thixoforging of multi material systems
多材料系统触变锻造期间和之后的混合相互作用
  • 批准号:
    313885700
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Joining of metal and fibre components based on the semi-solid forming process
基于半固态成型工艺的金属和纤维部件的连接
  • 批准号:
    271949384
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Process combination of lateral extrusion and shear forming with straight tool motion to manufacture crankshaft-like components
将横向挤压和剪切成型与直线工具运动相结合的工艺组合来制造曲轴类部件
  • 批准号:
    276963522
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
New methodology of springback compensation for Advanced High Strength Steels based on geometrical modifications
基于几何修改的先进高强度钢回弹补偿新方法
  • 批准号:
    267134330
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Development of a layered composite material with one-sided stiffeners and thin damping layer and characterization of its formability
一种具有单面加强筋和薄阻尼层的层状复合材料的开发及其成形性能表征
  • 批准号:
    262424410
  • 财政年份:
    2014
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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