Research on Multi-Steps Tube-Compression of Thin-Wall Parts with Variable Diameter by Viscous Pressure Forming

Abstract:

Tube-compression is one of the usual forming methods for variable diameter parts. Due to the influence of compression instability, buckling and wrinkling are prone to occur in tube-compression process, especially for the thin-wall parts, which restricts the diameter reduction ratio limit. In this paper, the viscous pressure forming (VPF) method is proposed for the problems in tube-compression. Utilizing the mechanical property and easily achieved loading mode of viscous medium, the buckling in the tube-compression process can be delayed and wrinkles caused by buckling can be eliminated, so as to increase the diameter reduction ratio limit. The multi-steps forming can divide the large total deformation into much small deformation, thus the small deformation can be controlled in the range of buckling and wrinkling. The process has the more ability to improve material’s forming capability than one-step forming. The deformation of the multi-steps tube-compression process by VPF is analyzed by finite element method (FEM). The variation of length-to-diameter and wall thickness after each step forming has influence on the next step compression. This forming method can also be used in tube-compression of high strength materials and can realize precise plastic forming of parts with high strength, thin-wall and large diameter variation ratio.

• Periodical: Advanced Materials Research (Volumes 264-265)
• Pages: 260-265
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.264-265.260
• Online since: June 2011
• Authors: Zhong Jin Wang, Ji Guang Li, Hai Lan Gong
• Keywords: Numerical Simulation, Tube-Compression, Variable Diameter Parts, Viscous Medium Pressure Forming

References

[1] LI Heng, YANG He, ZHAN Mei. A Review of the Research on Wrinkling in Thin-Walled Parts Plastic Forming Processes. Mechanical Science and Technology. 2004, 23(7): 837~842.

[2] GAO Tie-jun, WANG Zhong-jin, SONG Hui. Inner and outer pressure forming of 1Cr18Ni9Ti thin-walled part with variable diameter sections. Journal of Plasticity Engineering. 2006, 13(3): 40~43.

[3] ZHU Yong-wei, XU Jia-wen. Design of Feed Parameters about Electrochemical Machining Integral Components with Special-shaped Curved Surface. Aviation Precision Manufacturing Technology. 2005, 41(3): 31~34.

[4] YU Hai-ping, LI Chun-feng. Finite element analysis of free expansion of aluminum alloy tube under magnetic pressure. Trans. Nonferrous Met. Soc. China. 2005, 15(5): 1040~1044.

[5] WANG Xiaosong, YUAN Shijian, WANG Zhongren. Reaearch on wrinkling behavior in the hydroforming. Acta Metallurgica Sinica. 2003, 39(12): 1276~1280.

[6] C. T. F. Ross, J. Etheridge. The buckling and vibration of tube-stiffened axisymmetric shells under external hydrostatic pressure. 2000, (27): 1373~1390.

DOI: 10.1016/s0029-8018(99)00047-5

[7] Yoichi Murakoshi, Masaharu Takahashi, Toshio Sano. Inside bead forming of aluminum tube by electro-magnetic forming. Journal of Materials Processing Technology. 1998, (80-81): 695~699.

DOI: 10.1016/s0924-0136(98)00217-9

[8] WANG Zhongjin, WANG Zhongren. Study on Effect Factors of Strain Rate in Viscous Pressure Forming. Journal of Plasticity Engineering. 1999, 6(3): 46~48.

[9] Z. J. Wang, J.G. Liu, X. Y. Wang, Z. Y. Hu, B. Guo. Viscous Pressure Forming(VPF): State-of-the-Art and Future Trends. Journal of Materials Processing Technology. 2004, 151: 80~87.

DOI: 10.1016/j.jmatprotec.2004.04.010

[10] FANG Kunfang, HUANG Ying. Mechanical Engineering Material Application Manual. Publishing House of the Northeast University. 1995: 246-266, 911-924.