Effects of extrusion variables on temperature distribution in axisymmetric extrusion process
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Date
2007-09-01
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Publisher
International Journal of Mechanical Sciences
Abstract
A numerical method was developed to simulate the non-steady-state temperature distributions during forward extrusion process. The
velocity, strain rates, and strain fields within the deformation zones during extrusion were obtained, using upper bound method of
analysis to obtain internal heat generations coupled to the necessary heat transfer conduction equations. The computer program written
in C++ language essentially simulates the extrusion process and takes into account extrusion variables such as material properties,
friction conditions, extrusion velocity, extrusion ratio, die preheat temperature, billet height, percentage reduction in area, and die land
length. The effects of billet height and percentage reduction in area on the temperature distributions within the dead metal zone give good
agreements with experimental results. It is found that the higher the billet’s heights and higher the percentages reduction in areas, the
higher the temperature rises during the extrusion process. The die land zone shows increasing temperature rise with increasing friction
coefficient, while increasing friction coefficient has no effect on the dead zone temperature. Also, increasing speed of deformation shows
an increasing dead zone temperature rise than a more gradual die land temperature rise. It can be stated that the extrusion temperature
increases proportionally to the increase of the container temperature.
Description
Staff Publication
Keywords
Billet height, % reduction in area, Dead metal zone, Die land zone, Temperature distribution, Ram travel