Influence of a modified drawing process on the resulting residual stress state of cold drawn wire

Influence of a modified drawing process on the resulting residual stress state of cold drawn wire
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改进的拉拔工艺对冷拔线材残余应力状态的影响

DOI:
10.1051/matecconf/201819004004
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Bergmann
Bergmann
中科院分区:
--
文献类型:
--
作者:
Baumann;Selbmann;Brömmelhoff;Kräusel;Landgrebe;Bergmann

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扭力杆用于汽车工程以及其他工业应用。这种元件是由冷拔的线材弯曲而产生的。在传统的拉丝工艺中,拉伸残余应力发生在线材表面附近。由于在有限的装配空间中需要较小的弯曲半径,因此由于成形性降低而导致部件失效。额外的操作,如热处理或喷丸处理是必要的,以影响线材的残余应力和提高扭棒的动态稳定性。研究的目的是减少金属丝表面附近的拉伸残余应力,以消除加工步骤,提高成形性。因此,在分层挤压的基础上,开发了一种改进拉深模几何形状的成形技术。采用有限元模拟的方法,研究了钢合金拉丝后单元几何形状、单元个数和工艺修改对残余应力的影响。对结果进行了评价,并与传统拉丝工艺进行了比较。此外,还概述了实验测试装置的设计要求以及利用x射线衍射测量残余应力的方法。
Torsion bars are used in automotive engineering as well as in other industrial applications. Such elements are produced by bending cold drawn wires. In conventional drawing processes tensile residual stresses occur near the surface of the wire. Small bending radii, which are required in limited assembly spaces, result in component failure due to reduced formability. Additional operations such as heat treatment or shot peening are necessary to influence the residual stress of the wire and to improve the dynamic stability of the torsion bar. The aim of the research is to reduce tensile residual stresses near the surface of the wire in order to eliminate process steps and to enhance formability. Therefore, a forming technology is developed by using a modified drawing die geometry on the basis of gradation extrusion. Finite element simulation is used to investigate the influences of element geometry, number of elements and process modification on the resulting residual stresses after wire drawing of a steel alloy. The results are evaluated and compared with the conventional wire drawing process. Furthermore, the requirements for the design of an experimental test device will be outlined as well as the measurement of the residual stresses by using X-ray diffraction.
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