The tribological state test in metal forming processes using experiment and modelling

• Autorzy: Jurkovic, M. , Jurkovic, Z. , Buljan, S.
• Języki publikacji: EN

Abstrakty

EN

Purpose: of this paper is test of the tribological state in metal forming processes with main aims the determination of state on the tool contact surface (contact stresses and friction coefficient) friction coefficient modelling and simulation and to present the original method of defining contact stresses tf and pn and coefficient of contact friction m. Design/methodology/approach: of this research is review of contact stresses determination methods, general principles of stochastic modelling, experimental friction test and modelling, examples tribological state test and simulaton by deep drawing and drawing processes. Main achievement are: original experimental identification of contact stresses, original experimental of tools for measurement of contact stresses, mathematical model for defining the tribological state. Application methods of this research are: experimental, tribological state test in forming processes by means of experiment and modelling, statistical and direct contact stresses determining method. Findings: experimental and stochastic modelling of tribological parameters of the forming processes and verification of mathematical model. The tribological state test is performed on the basis of experimental investigations and stochastic modelling. Research limitations/implications: modelling and optimization of tool geometry and selection of optimal lubricators, development experimental methods in the determination of contact stresses, etc. Practical implications: Results of investigations in processing conditions show that the desired effects can be achieved: increased durability of tools 20-40%, reduced stagnation time in the machining process 20-30%, increase on the productivity of the forming process 15-30% and less energy consumption up to 15%. Originality/value: of this paper is obtained original mathematical model for defining coefficient contact friction and contact temperature on the contact surface of tool. Also, is obtained original experimental tool for measurement of contact stresses.

Słowa kluczowe

PL

kształtowanie plastyczne; głębokie tłoczenie; czujnik

EN

plastic forming; deep drawing; tribological state; sensor tool

• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 18, nr 1-2
• Strony: 383--386
• Opis fizyczny: Bibliogr. 15 poz., rys., tab., wykr.

Twórcy

autor

Jurkovic, M.

• Department of Industrial Engineering and Management, Faculty of Engineering, University of Rijeka, Vukovarska 58, HR-51000 Rijeka, Croatia

autor

Jurkovic, Z.

• Department of Industrial Engineering and Management, Faculty of Engineering, University of Rijeka, Vukovarska 58, HR-51000 Rijeka, Croatia,

autor

Buljan, S.

• Federal Ministry of Energy, Mining and Industry, Adema Buca 34, BA-88000 Mostar, Bosnia and Herzegovina

Bibliografia

• [1] M. Jurkovic. Dž. Tufekcic. Stochastic modelling and simulation of tribological parameters in cold drawing process. Proceedings of the 6 th International Conference on Technnology of Plasticity - ICTP ́99. Nuremberg. 1999. 1781-1786.
• [2] M. Jurkovic. A. Hriesik. Z. Jurkovic. I. Vitez. Modelling of tribological parameters in process of cold drawing and selection of optimal lubricators. Metallurgy 37(1998)3. 159-163.
• [3] M. Jurkovic. Research of tribological parameters in the process of drawing and selection of optimal lubricators. Faculty of Engineering. University of Rijeka. Engineering Review 16 (1996) 37-42.
• [4] M. Jurkovic. Mathematical modelling and optimization of machining processes. Faculty of Engineering. University of Rijeka. 1999. (in Croatian).
• [5] Z. Jurkovic. Modelling and simulation of tool loading by machining process. Master thesis. Faculty of Engineering. University of Rijeka. 2002. (in Croatian).
• [6] A. Westeneng. Modeling of contact and friction in deep drawing processes. PhD thesis. University of Twente. 2001.
• [7] C. Tuncer. T. A. Dean. Surface stress measurement techniques in metal forming. International Journal of Machine Tools & Manufacture 28 (1988) 417-428.
• [8] M. Jurkovic. Band cross section geometry in the function of thermo-mechanical factors and stress state of cold forming processes. PhD thesis. Faculty of Mechanical Engineering. University of Banja Luka. 1981.
• [9] M. Jurkovic. Z. Jurkovic. Direct determining of stress and friction coefficient on the contact surface of tool and workpiece. Proceedings of the 1st International Conference on Industrial Tools - ICIT ́97. Maribor. 1997. 127-132.
• [10] Z. Jurkovic. M. Jurkovic. Modelling and optimization of the tool geometry for deep drawing of sheet metal. Metallurgy 39(2000)4. 231-236.
• [11] C. Nyahumwa. J. Jeswiet. A friction sensor for sheet metal rolling. Annals of the CIRP. 40(1991)1. 231-235.
• [12] M. Tisza. T. Fülöp. A general overview of tribology of sheet metal forming. Journal for Technology of Plasticity 26 (2001)2. 11-26.
• [13] M. Sulonen. P. Eskola. A reliable method for measuring the friction coefficient in sheet metal forming. Meeting of IDDRG. Tokyo. 1981.
• [14] J.A. Schey. Tribology in metalworking: friction. Lubrication and wear. ASM. (1983). Metals Park. Ohio.
• [15] M. Stefanoviü. S. Aleksandroviü. The significance of the change of contact pressure in blank-holder zone in deep drawing. Proceedings of the Balkantrib ́99. Kragujevac. 1999. 249-256.