New process design for reduction of springback by forming with alternating blank draw-in
New process design for reduction of springback by forming with alternating blank draw-in
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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
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Liewald
中科院分区：
文献类型：
--
作者：
Radonjic;Liewald
超高强度钢 (UHSS) 在提高乘客安全性和减轻车辆总重方面为车身制造提供了绝佳的机会。然而，在形成这种金属板材时，回弹是一个严重的问题。在此背景下，斯图加特大学金属成形研究所 (IFU) 开发了一种可显着减少回弹的新方法。这种方法的独特之处在于在拉深过程中交替拉入毛坯。本文展示了有关刀具半径对此类交替毛坯拉入成形回弹的影响的研究结果。在这些研究中，使用了 DP 980 级超高强度钢板。首先，使用仿真代码 LS-Dyna 对帽槽零件几何形状进行有限元 (FE) 分析。为了尽可能准确地描述模拟中的材料行为，提供了额外的测试来确定弹性模量的应变水平相关变化以及所用板材的包辛格效应参数。初步模拟结果表明，使用较小的刀具半径通常会导致交替毛坯拉深成形时回弹量减少。为了验证这些模拟结果，使用与模拟相同的几何和技术参数进行了实验工作。随后，利用光学测量系统GOM ATOS 5M对实验中出现的零件形状偏差进行了测量。最后将模拟结果与实验结果进行了比较，发现具有令人满意的一致性。
Ultra-high-strength steels (UHSS) offer exceptional opportunities in car body manufacturing regarding the improvement of passenger safety as well as the reduction of total vehicle weight. However, springback represents a serious problem when forming such sheet metal materials. In this context, a new approach that can be used for significant reduction of springback was developed at Institute for Metal Forming, University of Stuttgart (IFU). The uniqueness of this approach is the alternating draw-in of blank during the deep drawing process. This paper shows research results regarding the influence of tool radii on springback by forming with an alternating blank draw-in of this kind. In these investigations, an ultra-high-strength steel sheet of the grade DP 980 was used. Firstly, a finite element (FE) analysis was conducted for a hat channel part geometry using the simulation code LS-Dyna. In order to describe the material behaviour in simulation as exactly as possible, additional tests were provided for determining the strain level dependent change of the elastic modulus as well as Bauschinger effect parameters of the used sheet material. Initial simulation results showed that use of smaller tool radii generally lead to reduced springback amount when forming with alternating blank draw-in. In order to validate these simulation results, experimental work was carried out with the same geometrical and technological parameters as in simulation. Afterwards, the part shape deviations occurred in the experiments were measured by using the optical measurement system GOM ATOS 5M. At the end, the simulation results were compared with the experimentally obtained results and a satisfying consistency was found.
DOI：
10.1088/1757-899x/159/1/012028
发表时间：
2016
期刊：
IOP Conference Series: Materials Science and Engineering
影响因子：
--
作者：
Radonjic;Liewald
通讯作者：
Liewald
DOI：
10.4028/www.scientific.net/amr.1018.277
发表时间：
2014
期刊：
Advanced Materials Research
影响因子：
--
作者：
Annika Weinschenk;W. Volk
通讯作者：
W. Volk