Application of numerical techniques to the analysis of strains in the drawing process

Abstract

For two variants of the drawing process of solid round profiles (α = 6°C, RO/Rk = 1.136, m = 0.15 and α = 4°C, RO/Rk = 1.192, m = 0.15) the effective strain distribution εj and the coordinate grid distortion are presented and compared. The results presented have been obtained theoretically using FEM and experimentally by means of the coordinate grid method. Based on the programme which simulates the drawing process of solid round profiles the distribution of the ε̇rz strain‐rate tensor component, the effective strainrate εj and the die pressure distributions on the metal‐die contact surface were presented. Exact description of the experiments carried out has also been presented. Investigations of strain distribution were done on copper specimens. Results were presented as three dimensional graphs. This helps to make a detailed analysis of changes occurring in the deformation zone for some of the quantities considered. Comparing effective strain distribution εj and grid distortions it follows that experimental data agree with theoretical calculations. Differences occur after the metal exits from the die.The presented results of theoretical considerations and experimental investigations help to state that the programme constructed, while based on the FEM, simulated the drawing process of solid round profiles accurately.