Double-action extrusion press
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United States of America Patent
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Nov 8, 2016
Grant Date -
Jul 23, 2015
app pub date -
Jul 5, 2013
filing date -
Sep 12, 2012
priority date (Note) -
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Abstract
A double-action extrusion press obtains a tubular product, wherein the pressure-receiving surface area of a cylinder chamber on the side from which hydraulic oil is discharged from a container cylinder and the pressure-receiving surface area on the rod-side chamber of a piercer cylinder are set to be the same when a container moves in the extrusion direction, and the cylinder chamber on the side from which hydraulic oil is discharged from the container cylinder and the rod-side chamber of the piercer cylinder are connected by an oil pressure conduit and are in communication with each other when a billet is extruded from the extrusion stem after piercing has been completed.
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