WIT Press


Improved Method For Better Temperature Assessment In The Contact Of Die Bearing Surface With Profile Surface In Aluminium Hot Extrusion

Price

Free (open access)

Paper DOI

10.2495/HT040141

Volume

46

Pages

15

Published

2004

Size

2,112 kb

Author(s)

R. Turk, M. Terčelj, P. Fajfar & G. Kugler

Abstract

The paper presents an improved technique of temperature measurement on the bearing surface of industrial die during hot extrusion of aluminium and an assessment of the heat transfer coefficient from the extruding profile on the bearing surface. The measurement was carried out by using a method of split die and three thermocouples (incorporation of the K type and welded at distances from 0.18 to 1.32 mm from the bearing surface) with high measuring accuracy. Extrusion exit speeds were increased to the extent that Mg2Si, with a known melting point, started to melt on the extruded profile. This state was determined by the phenomenon of oscillations of the measured temperature of the nearest two thermocouples and by the phenomenon

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