عنوان مقاله [English]
Friction is one of the most effective parameters in the forging process, which its analysis is needed. Efficient lubrication is best way in controlling friction and wear in this process. Because of the low cost of lubrication in comparison with the reductions that it creates in cost, testing the lubricants is important in forging. One of the best ways of testing the lubricant is the ring compression test, which with finite element method, the friction coefficient is calculated. In this research the effect of mixed graphite in water and also the effect of the amount of graphite in the lubricant in the reduction of friction was calculated using the ring test. Effect of the lubricant was easily recognized in the final dimensions of the specimens in result of the reduced friction this was seen in the changing of sticking friction to sliding friction. Nevertheless, the changes in the amount of graphite in water did not have a great effect on the reduction of the friction coefficient. Furthermore, after viewing differences in the friction coefficients calculated by the means of finite element analysis ABAQUS software and the frictional calibration curves, it was concluded that the sole calibration curves could not be used for hot working conditions.