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A STUDY ON HOT WORKING AND FRICTIONAL BEHAVIOUR OF 6082 ALUMINIUM ALLOY DURING HOT FORMING USING PRESSURE TESTS AND FINITE ELEMENT SIMULATION

Babak Barooghi Bonab ; Young researchers and elite club, Ilkhchi branch, Islamic Azad university, Ilkhchi, Iran
Mohammad Hossein Sadeghi ; Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
Hamed Halimi Khosrowshahi ; Young researchers and elite club, Ilkhchi branch, Islamic Azad university, Ilkhchi, Iran
Amir Amiri ; Faculty of Engineering, Islamic Azad university- North Tehran branch, Teheran, Iran

Sažetak

Numerous variables affect the process of metal forming in which friction is the most important variable. Friction has effect on the material flow and the force required for metal forming. It is necessary to have the exact amount of the coefficient of friction in order to determine the amount and effect of the friction. In this paper, the ring compression test is used to determine the shear friction coefficient in hot working processes and the pressure test of cylindrical specimens is utilized to specify the hot working behaviour of 6082 aluminium alloy. The variation of the internal diameter of the ring during deformation is dependent of the shear friction coefficient, so it can be a criterion for determining this coefficient. Graphite, Teflon and Mica sheets are chosen as lubricants. Friction calibration curves are plotted using the finite element simulation to compare these results with the results obtained from the tests. Shear coefficients are obtained for every lubrication case. The results demonstrate that the best lubrication case of the hot working of 6082 aluminium alloy is achieved when the shear friction coefficient of m=0.32 is used whereas the value of m=0.69 is obtained in the case when no lubricant is used.

Ključne riječi

friction; hot working; ring pressure test; 6082 aluminium alloy

Hrčak ID:

138264

URI

https://hrcak.srce.hr/138264

Datum izdavanja:

17.4.2015.

Posjeta: 1.676 *