Direct double-action extrusion press
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United States of America Patent
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Jul 25, 2017
Issued Date -
N/A
app pub date -
Nov 18, 2014
filing date -
Dec 4, 2013
priority date (Note) -
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Abstract
A direct double-action extrusion press includes a main crosshead to which an extrusion stem is fixed; a main cylinder having a main ram that advances the main crosshead and pressing on a billet; a piercer cylinder disposed inside the main ram and drives a mandrel; a plurality of side cylinders that retracts the main ram via the main crosshead; and a hydraulic circuit for supplying hydraulic oil to the main cylinder, the piercer cylinder, and the side cylinders. Cylinder chambers of the plurality of side cylinders on a side where the hydraulic oil is discharged when the main crosshead is advancing have a pressure-receiving area equal in total to that of a rod side chamber of the piercer cylinder. During billet extrusion, the hydraulic circuit causes fluid communication through the rod side chamber of the piercer cylinder and each cylinder chamber of the plurality of side cylinders on the side where the hydraulic oil is discharged.
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