The Frictional Mechanism on Surface of Metals Plastically Deformed : 3rd Report, Effects of the Bulk Plastic Deformation on the Frictional Shear Stress

概要

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Using the two-dimensional drawing-type friction testing machine reported in the 2nd report, the experiments on aluminium sheets have been first carried out. The following have been concluded. (1) The frictional shear stress τ_f on the blank-holder surface is proportional to a real contact pressure Pr in every lubricant. This is similar to that obtained on the sheet metal drawing and the U-bending reported previously. After all it has been concluded that τ_f is not influenced by the plastic deformation but by Pr only, on the frictional surface where the apparent surface area does not increase. (2) The values of τ_f on the die surface are always larger than those on the blank-holder surface. It has been found newly that τ_f is influenced by an increase of the apparent surface area besides Pr, on the die surface. (3) Variations of τ_f on both the blank-holder and the die surface correspond consistently to variations of the appearance of the frictional surfaces. (4) Consequently, it has been concluded that the bulk plastic deformation influences mainly the frictional mechanism through an increase of apparent surface area.
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