Forming Mechanism of Folding Defect within Closed Die Forming Car Steering Knuckle

Abstract:

Steering knuckle is the key part of vehicle steering system. The forming technology combined closed die pre-forging with open finish-forging has some advantages such as higher material utilization ratio and lower forming forces and so on. While simulating the closed die extrusion forming process of car steering knuckle, folding defect emerges on the contact area of Branch I and lower punch in the lateral extrusion process. The forming mechanism of the folding defect is studied by numerical simulations and experiments, which mainly consider the influence of lower punch shape and size, extrusion speed and friction conditions to folding length. The results show that the main factors that affect folding defects are the lower punch shape and size. Keywords: steering knuckle, folding defect, closed die forming, numerical simulation, experiment study

• Periodical: Materials Science Forum (Volumes 704-705)
• Pages: 240-244
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.704-705.240
• Online since: December 2011
• Authors: De Ying Zhao, Lian Dong Zhang, Li Na Sun
• Keywords: Closed Die Forming, Experiment Study, Folding Defect, Numerical Simulation, Steering Knuckle

References

[1] MianYi Chen: Machinist Metal Forming Vol. 8 (2001), p.3.

[2] GongPing Wang and GuanHua Shi: Special Casting & Nonferrous Alloys Vol. 7 (2007), p.538.

[3] G. Hirt, R. Cremer, T. Witulski and H. -C. Tinius: Materials & Design Vol. 18 (1997), p.315.

[4] Sang-Yong Lee, Se-Il Oh. J. Mater. Process. Technol. Vol. 130-131 (2002), p.587.

[5] JianHua Gou: Machinist Metal Forming Vol. 7 (2004), p.66.

[6] ZhiShe Dong: Forming & Stamping technology Vol. 6 (2000), p.9.

[7] DeYing Zhao, LianDong Zhang, HuiXue Sun1 and LiNa Sun: Advanced Materials Research Vol. 97-101 (2010), p.3060.