Investigation of internal flow occurring during a square-diamond rolling pass, using plasticine:as a model material

Abstract

Changes in the cross-section of high-quality steel bar by rolling between grooved rolls have been based on experience rather than on precise methods, due to lack of information on the effects of changing the shape of a material by the rolling process. In this paper the authors analyse the internal flow of the material as it changes its cross-sectional shape, using plasticine to simulate the steel. By means off low analysis, the variations in spread, elongation, and strain in the bar are determined and the principal forces having an influence on these factors are observed. Possible reasons for the appearance of defects are suggested and a simple test is describedfor the evaluation of the ‘tearing’ limits, due to shear forces, that the plasticine can withstand and these values are compared with the experimental rolling results.