A Study on the Warm Forging-Flaring Process of Brass Tube

Abstract:

At present, quite a lot of enterprises, small or medium-sized, are engaged in developing the various necessaries of livelihood. And, the forming processes are generally adopted for the methods of parts manufacture. Though various forming technology progress rather well, but the warm working process often cannot obtain fine finished products in the process of manufacturing. The warm working process still needs more adequate techniques. This study is focused on the analyzing of the warm forging-flaring process of brass tube, and the improving of the die design and the working procedures. In this paper, two sets of forging and flaring die are designed for experimental works. The results of simulation are compared with the experiments, the formability of brass tube showed a good agreement. Therefore, we suggest a multi-pass of forging process instead of single-pass process. The stress distributions and loading history in forming processes are also assessed in details. The method used in this study is available in the relative warm forming processes and die design. It is helpful to increase the additional value of products and promote the level of competition in manufacturing industry.

• Periodical: Advanced Materials Research (Volume 939)
• Pages: 524-529
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.939.524
• Online since: May 2014
• Authors: Chun Ho Liu*, A Cheng Wang, Cheng Han Lee, You Min Huang
• Keywords: Die Design, Flaring, Forging, Warm Working

References

[1] B. P. P. A. Gouveia, J. M. C. Rodrigues and P. A. F. Martins, Fracture predicting in bulk metal forming, Int. J. Mech. Sci. 38(4) (1996) 361-372.

DOI: 10.1016/0020-7403(95)00069-0

[2] D. Vilotic, N. Chikanova and S. Alexandrov, Disc upsetting between spherical dies and its application to the determination of forming limit curves, J. Strain Anal. 34(1) (1999) 17-22.

DOI: 10.1243/0309324991513588

[3] Y. H. Lu et al., Study of ductile fracture and preform design of upsetting process using adaptive network fuzzy inference system, J. Mater. Process. Technol. 140 (2003) 576-582.

DOI: 10.1016/s0924-0136(03)00795-7

[4] C. H. Liu, A. C. Wang, Y. S. Chen and C. M. Wang, The coupled thermo-mechanical analysis in the upsetting process by the dynamic FEM, J. Mater. Process. Technol. 201 (2008) 37-42.

DOI: 10.1016/j.jmatprotec.2007.11.174

[5] K. Kitazawa, Criteria for outward curling of tubes, ASME, J. Eng. Ind. 115(4) (1993) 466-471.

DOI: 10.1115/1.2901791

[6] H. Yang and S. Li, Process optimization of the inverting-forming of thin-walled tubes with radius dies, J. Mater. Process. Technol. 52 (1995) 489-495.

DOI: 10.1016/0924-0136(94)01621-7

[7] Y. H. Lu, Study of tube flaring ratio and strain rate in the tube flaring process, Finite Elem. Anal. Des. 40 (2004) 305-318.

DOI: 10.1016/s0168-874x(03)00049-0

[8] J. O. Hallquist, LS-DYNA® Theory Manual, LSTC, Livermore, (2006).

[9] C. H. Lee, An analysis of manufacturing process of different thicknesses copper pipes, Master Thesis, National Taiwan University of Science and Technology, Taiwan, 2009 (in Chinese).