Metal extrusion process and extrusion press
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United States of America Patent
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Mar 25, 1997
Grant Date -
N/A
app pub date -
May 6, 1994
filing date -
May 6, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A process for extrusion of a metal billet placed in a container delimiting a housing for the billet. One end of the container is closed by a closing bottom and the other end by a dummy block. Before extrusion, the billet is pre-compressed in order to apply it against the inner face of the housing. At the start of the pre-compression, a limited play is maintained between the closing bottom and the corresponding end of the container, preventing the container from approaching the closing bottom during pre-compression so as to allow evacuation of air contained between the billet and the inner housing face during expansion of the billet.
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