ASPECTS REGARDING THE INFLUENCE OF EXTERNAL FRICTION CONDITIONS ON MATERIALS FORMABILITY

Mariana POP, Dan FRUNZA

Abstract


The aim of the paper is to present the influence of friction conditions on the flow of material in the processes of plastic formation of metals. Insufficient knowledge of the interface between the material and the forming tools is a factor for which the phenomenon of friction is not fully known. Due to friction the deformation of the material occurs unevenly. The non-uniformity of the deformation is greater the more the friction is accentuated. In order to determine the influence of the friction state on the material flow, experiments were performed for: the determination by the ring method of the friction coefficients in the case of three types of friction states; determination of the influence of the deformation energy on the formability of the material depending on the coefficient of friction at the surface of the sample-tools.

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