The Frictional Mechanism on Surface of Metals Plastically Deformed : 2nd Report, Design and Calibration of Drawing-type Friction Testing Machine and Some Preliminary Experiments

概要

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In order to make clear the effects of the bulk plastic deformation on the frictional mechanism, a two-dimensional drawing-type friction testing machine has been designed and made. Using this Apparatus, it is possible to measure simultaneously and continuously the frictional and normal forces on both metal surfaces of the die side and the blank-holder side during the process. The apparent surface area of metal increases notably on the die side only, although the microscopic surface texture varies notably on both the sides. It has been confirmed by a calibration of the measuring devices that all the forces shown above can be precisely measured without mutual interference. Some preliminary experiments on aluminium and copper sheets have been carried out by this apparatus. As the result, it has been found that the frictional coefficients on the die surface are larger than those on the blank-holder surface.
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