Abstract
Abstract A low-speed hot-ring compression test has been proposed to be helpful in classifying the tribological performances of lubricants in hot forging of steel under severe conditions. In this previous work, we used calibration curves with considering heat transfer between the air and the hot work, the die and the hot work; however, without considering contact time and compression velocity. This calibration curves were insufficient to evaluate the frictional coefficient between the die and the work. To use more precise values of the frictional coefficients, we updated calibration curves with considering heat transfer between a die and lubricant, a lubricant and a work, air and a work by an experiment and a FEM analysis. It was found that the frictional coefficient between a die and a work was underestimated without considering heat transfer and velocity of the press.
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