A Numerical Method for Estimating the Temperature Distributions in Extrusion Through Conical Dies

[+] Author and Article Information
T. Altan

Plastics Department, E. I. du Pont de Nemours & Company, Wilmington, Del.

S. Kobayashi

University of California, Berkeley, Calif.

J. Eng. Ind 90(1), 107-118 (Feb 01, 1968) (12 pages) doi:10.1115/1.3604584 History: Received February 28, 1967; Online August 25, 2011


A numerical method was developed to predict the local temperatures in the billet and in the tooling before the extrusion starts. The method was further extended for calculating the nonsteady-state temperature distributions during extrusion. The necessary velocity, strain rate, and strain fields were obtained from a visioplaslicity experiment. Heat generation and conduction were approximated in two consecutive steps taking place during equal time increments Δt. The temperature dependencies of the flow stress and of the thermal constants of the billet and the tool materials were taken into account, and the entire procedure was programmed in FORTRAN IV to facilitate its general use for analyzing extrusions with different extrusion ratios, materials, die angles, ram speeds, and friction conditions.

Copyright © 1968 by ASME
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