Fabrication of Saddle-Shaped Surfaces by Flame Forming Process

Document Type : Research Paper

Authors

Department of Mechanical Engineering, Arak University of Technology, Arak, Iran

10.22099/ijmf.2020.36586.1150

Abstract

The flame forming process is widely used to manufacture ship hull plates. The saddle-shaped surfaces have different curvatures in perpendicular angles of planes and the manufacturers face an anti-clastic curvature. In this article, the manufacturing of saddle-shaped surfaces utilizing the flame forming process is investigated. The spiral irradiating scheme is used for forming. In order to study the effects of process parameters (pitch of spiral path, number of irradiation passes, and the movement pattern (In-to-Out or Out-to-In)), several experiments have been carried out. Determining the effect of process parameters for fabrication of this type of sheet leads to the precise manufacturing with reduced costs and lower production time. After the implementation of the experiments, the displacement of the sheet is measured and the saddle-shaped surfaces are manufactured successfully by the spiral irradiating scheme. The final part has large deformations and the curvature can be clearly observed. The deformation of the saddle-shaped surface is noticeably increased by reducing the spiral path pitch (110% increase in height of the center point of the sheet). Also, it is proved that the Out-to-In spiral path movement pattern leads to larger deformations than In-to-Out ones. Besides, the deformations of manufactured saddle-shaped surfaces are increased by increasing the number of spiral passes.

Keywords


[1] K.U. Odumodu, D. Shuvra, Forceless forming with laser, In: Proceedings of the 1996 ASME international mechanical engineering congress and exposition Atlanta, GA, USA. Advanced materials: development, characterization processing, and mechanical behavior. New York: ASME (1996) 169-170.
[2] A. Moshaiov, R. Latorre R, Temperature distribution during plate bending by torch flame heating, Journal of Ship Research 29 (1985) 1-11.
[3] A. Moshaiov, W. S. Vorus, The mechanics of the flame bending process: theory and applications, Journal of Ship Research 31 (1987) 269-81.
[4] J. G. Shin, A. Moshaiov, Modified strip model for analyzing the line-heating method-Part 1: elastic plates, Journal of Ship Research 35 (1991) 172-182.
[5] A. Moshaiov, J. G. Shin, Modified strip model for analyzing the line-heating method-Part 2: thermo-elastic–plastic plates, Journal of Ship Research 35 (1991) 266-275.
[6] Y. Ueda Y, H. Murakawa, A. M. Rashwan, R. Kamichika, M. Ishiyama, J. Ogama, Development of computer-aided process planning system for plate bending by line heating (report 4)-decision making on heating conditions, location, and direction, Journal of Welding Research Institute 22 (1993) 305-313.
[7] K. Ueda K, H. Murakawa, A. Rashwan, Y. Okumoto, R. Kamichika, Development of computer-aided process planning system for plate bending by line heating (report 1)-relation between final form of plate and inherent strain, Journal of Ship Production 10 (1994) 59-67.
[8] J. G. Shin, J. H.  Lee, W. D. Kim W. D, A numerical simulation of line heating process for plate forming, Practical Design of Ships and Mobile Units (PRADS) 2 (1995) 1447-1458.
[9] H. B. Clausen, Plate forming by line heating, Ph.D. thesis, Technical University of Denmark, Copenhagen, Denmark (2000).
[10] M. Ishiyama, Y. Tango, M. Shirai M, An automatic system for line heating bending processing method utilizing FEM application, 10th International Conference on Computer Applications in Shipbuilding (ICCAS), Cambridge, USA, (1999) 419-436.
[11] G. Yu, R. J. Anderson, T. Maekawa, N. M. Patrikalakis, Efficient simulation of shell forming by line heating, Journal of Mechanical Sciences 43 (2001) 2349-2370.
[12] C. D. Jang, S. C. Moon, An algorithm to determine heating lines for plate forming by line heating method, Journal of Ship Production 14 (1998) 238-245.
[13] A. Moshaiov, W. S. Vorus, The Mechanics of the flame bending process: theory and applications, Journal of Ship Research 31 (1987) 269-281.
[14] A. Moshaiov, J. G. Shin, Modified strip model for analyzing the line heating method-Part 2: thermo-elastic-plastic plates, Journal of Ship Research 35 (1991) 266-275.
[15] Z. Shao, J. Jiang, J. Lin, Feasibility study on direct flame impingement heating applied for the solution heat treatment, forming and cold die quenching technique, Journal of Manufacturing Processes 36 (2018) 398-404.
[16] S. J. Hemmati, M. A. Niazi, M. Maarefat, R. Naghdabadi, Thermo-elastic-plastic analysis of plate forming process by flame bending method, Journal of Computational Methods in Engineering 24 (2006) 159-170.
[17] F. P. Incropera, D. P. DeWitt, T. L. Bergman, A. S. Lavine, Introduction to Heat Transfer, 5th Edition, Wiley, New Jersey, (2006).