Study on Non-Symmetric Extrusion and Drawing
Using the upper bound theory, an analytical method has been newly developed in order to investigate the extrusion and/or the drawing processes of rods, bars and wires with various kinds of non-symmetric cross-sections. In this analysis, generalized formulas of the kinematically admissible velocity field of the material in the die are newly presented and the mathematical procedures to simulate deformation of the material and to calculate the total power of deformation in the process are developed.
The power requirements, the extrusion pressure and/or drawing stress, the optimal die length and the dead zone angle have been successfully calculated regarding the processes from round, square and rectangular billets to rods, bars and wires with square, rectangular, hexagonal, L-type, T-type, H-type and flower-type cross-sections. By this method, it becomes possible to make systematic investigation into many aspects and characteristics of the non-symmetric extrusion and/or drawing and to predict the optimal shape and dimension of the die for the required product.
Unable to display preview. Download preview PDF.
- V. NAPGAL and T. ALTAN, Proc. 3rd North Amer. Metalworking Res. Conf., (1975) p.26–40.Google Scholar
- B. AVITZUR et. al., Proc. 20th Int. Mach, Tool Des. Res. Conf., (1979) p.149–156.Google Scholar
- S. HOSHINO and J. S. CUNASEKERA, Proc. 21st Int. Mach. Tool Des. Res. Conf., (1980) p.97–105.Google Scholar