Process sequence design in cold extrusion to form an axisymmetric shell body

Abstract

The multi-stage cold extrusion process to produce a steel axisymmetric shell body is investigated for process sequence design by using the finite element method. The main design goal is to obtain the optimum process sequence which can produce the required part most economically. The established process sequence is simulated and design criteria are examined. Based on the results of preliminary simulation, two strategies for improving the sequence are derived for the type of preform. Using the approach taken with a plate preform, the finished product of a shell body is produced in three operations and two annealing treatments while the conventional sequence consists of five forming operations and four annealing treatments. The final design of the improved sequence is achieved by controlling process parameters and through creative punch design based on the finite element simulations.