A study of optimum die-design in the heading process with two blows. Part 2: Use of finite-element analysis

Abstract

A method of examining the optimum die-condition in the double-blow heading process by the use of the rigid-plastic finite-element analysis is discussed. The metal flow in the double-blow heading process is observed by the distortions of an inscribed grid. The possibility of surface fracture in the double-blow heading process is assessed by means of the hoop-stress distribution on the free surface. The application of a criterion for ductile fracture to the double-blow heading process is attempted. The possibility of internal fracture in the double-blow heading process is evaluated from the effective-strain distribution and the distorted grid patterns. The relationship between the tool life of the finish forming die and the die-condition in the double-blow heading process is investigated.