Optimization of the blank holder force in cup drawing

• Autorzy: Gharib H. , Wifi A. S. , Younan M. , Nassef A.
• Języki publikacji: EN

Abstrakty

EN

Purpose: Develop an optimization strategy for the cup drawing process in order to produce a defect free deep drawn cup. Design/methodology/approach: An optimization strategy for the blank holder force (BHF) scheme is proposed which searches for the BHF scheme that minimizes the maximum punch force and avoids process limits. This strategy is applied to the linearly varying BHF scheme and compared to the constant BHF. Findings: The optimized linear BHF scheme resulted in an improved cup forming when compared to that produced by the constant BHF scheme. The BHF scheme is optimized for different cases of drawing ratios and die coefficients of friction in order to analyze the nature of the optimum linear BHF scheme. It was found that the slope of the linear BHF scheme increases with the increase in the drawing ratio in a linear manner. Also, the intercept of the function showed a nearly linear variation with the drawing ratio. A general equation is deduced for the optimum blank holder force at any drawing ratio for the cup under study. Research limitations/implications: The proposed optimization strategy can be applied to BHF schemes other than the linear one, and with different objectives. In this scheme, the objective has been the minimization of the maximum punch load. Other objectives like minimum punch work may be implemented. Practical implications: The proposed optimization strategy can be applied to any deep drawn part if an analytical or numerical model is available for this part. Originality/value: The research presented in this paper offers a new optimization strategy which can be useful in controlling the process parameters to produce a defect free deep drawn part using optimum process conditions.

Słowa kluczowe

EN

numerical techniques; computational mechanics; plastic forming; cup drawing; blank holder force optimization

PL

techniki numeryczne; mechanika obliczeniowa; formowanie plastyczne; obróbka plastyczna; optymalizacja

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 18, nr 1-2
• Strony: 291--294
• Opis fizyczny: Bibliogr. 15 poz., rys., wykr

Twórcy

autor

Gharib H.

• Mechanical Engineering Department, The American University in Cairo, 113 Kasr el Aini Street, Cairo 11511, Egypt

autor

Wifi A. S.

• Mechanical Engineering Department, The American University in Cairo, 113 Kasr el Aini Street, Cairo 11511, Egypt

autor

Younan M.

• Mechanical Engineering Department, The American University in Cairo, 113 Kasr el Aini Street, Cairo 11511, Egypt

autor

Nassef A.

• Mechanical Engineering Department, The American University in Cairo, 113 Kasr el Aini Street, Cairo 11511, Egypt

Bibliografia

• [1] S. Thiruvarudchelvan, W. Lewis.: Deep drawing with Blank Holder Force Approximately Proportional to the Punch Force, Transactions of the ASME, Journal of Engineering for Industry, 112 (3), 278-285.
• [2] S. Thiruvarudchelvan, N.H. Loh.: (1994). Deep Drawing of Cylindrical Cups with Friction-actuated Blank Holding. Journal of Materials Processing Technology, 40, 343-358.
• [3] J. Cao, M.C. Boyc.: (1995). Optimization of Sheet Metal Forming Processes by Instability Analysis and Control. Proceedings of the Fifth International Conference on Numerical Methods in Industrial Forming Processes - Numiform 95, Balkema, Rotterdam, 675-679.
• [4] Z.Q. Sheng, S. Jirathearanat, T. Altan.: (2004, April). Adaptive FEM simulation for prediction of variable blank holder force in conical cup drawing. International Journal of Machine Tools and Manufacture, 44 (5), 487-494.
• [5] R.Di. Lorenzo, L. Fratini, F. Micari.: (1999), Optimal blankholder force path in sheet metal forming processes: an AI based design procedure, Annals of CIRP, 48 (1), 231-234.
• [6] M.M. Moshksar, A. Zamanian.: (1996). Optimization of the Tool Geometry in the Deep Drawing of Aluminum. Journal of Materials Processing Technology, 72, 363-370.
• [7] M.T. Browne, M.T Hillery.: (2001). Optimizing the Variables when Deep-Drawing C.R.1 Cups. Journal of Materials Processing Technology, 136, 64-71.
• [8] M. Colgan, J. Monaghan.: (2003). Deep drawing process: Analysis and experiment. Journal of Materials Processing Technology, 132 (1-3), 35-41.
• [9] H. Gharib, A.S. Wifi, M. Younan, and A. Nassef, An Analytical Incremental Model for the Analysis of the Cup Drawing. Proceedings of the 14th International Scientific Conference on "Achievements in Mechanical and Materials Engineering AMME'2006, Wisla, 2006,
• [10] H.H. Gharib.: (2004). Analysis of the Cup Drawing Process and Optimization of the Blank Holder Force. M.Sc. thesis, The American University in Cairo, Cairo, Egypt.
• [11] N. Kawai.: (1961). Critical Conditions of Wrinkling in Deep Drawing of Sheet Metals. Bulletin of JSME, 4, 169-192.
• [12] Z. Marciniak, J.L. Duncan.: (1992). Mechanics of Sheet Metal Forming. Great Britain: Edward Arnold.
• [13] M.A. Ahmetoglu, A. Coremans, G.L. Kinzel, T. Altan.: (1993). Improving Drawability by Using Variable Blank Holder Force and Pressure in Deep Drawing of Round and Non-Symmetric Parts. SAE Special Publications, 944, Sheet Metal and Stamping Symposium, pp. 113-120.
• [14] D. Goldberg.: (1989). Genetic Algorithms in Search, Optimization and Machine Learning.
• [15] M.J. Saran, E. Schedin, A. Samuelsson, A. Melander, C. Gustafsson.: (1990). Numerical and Experimental Investigations of Deep Drawing of Metal Sheets. Journal of Engineering for Industry, Transactions of the ASME, 112 (3) 272-277.