Some Reasons For Decreased Service Time Of
Dies For Al Hot Extrusion
Author(s)
P. Fajfar, P. Panjan, G. Kugler & M. Terčelj
Abstract
In this contribution some important reasons for decreased service time of
selected nitrided and coated dies for Al extrusion are explained. The influences
of contact pressure, length of bearing surface, nitriding conditions and of the
preparation of inlet edge of bearing surface at PVD CrN coating were studied.
Laboratory tests of the wear at lower and increased contact pressure and an
analysis of the wear on industrial dies were carried out. The die design and the
flow of the extruded material should lead to a decrease of the contact pressure on
the bearing surface. Two different modes of the initial wear progress on the area
at the exit edge of the bearing surface were observed. Despite good adhesional
and other relevant characteristics of CrN coating, the analysis revealed that
inappropriate construction of the initial edge of the die bearing surface in
combination with the maintenance of the die seems to be the main reasons for a
considerably decreased service time of these dies as expected.
Keywords: Al hot extrusion, nitrided dies, Cr coatings, service time, wear
analysis.
Keywords
Keywords: Al hot extrusion, nitrided dies, Cr coatings, service time, wear
analysis.
Related Book
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