Title:
DIRECT DOUBLE-ACTION EXTRUSION PRESS
Document Type and Number:
WIPO Patent Application WO/2015/083536
Kind Code:
A1
Abstract:
In the present invention, a direct double-action extrusion press is equipped with: a main crosshead (23) to which an extrusion stem (22) is fixed; a main cylinder (26) having a main ram (24) for advancing the main crosshead and pressing on a billet (14); a piercer cylinder (34) that is disposed inside the main ram and drives a mandrel (31); a plurality of side cylinders (37) for retracting 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 (42) 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 that is equal in total to that of a rod side chamber (40) 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. Due to this configuration, a variation in the leading end position of the mandrel is suppressed.
Inventors:
YAMAMOTO TAKEHARU (JP)
Application Number:
PCT/JP2014/080491
Publication Date:
June 11, 2015
Filing Date:
November 18, 2014
Export Citation:
Assignee:
UBE MACHINERY CORP LTD (JP)
International Classes:
B21C31/00; B21C23/08
Domestic Patent References:
| WO2014041881A1 | 2014-03-20 |
Foreign References:
| JPS58185309U | 1983-12-09 | |||
| GB837126A | 1960-06-09 | |||
| JPS5142059A | 1976-04-09 | |||
| US2896783A | 1959-07-28 | |||
| JPS5456967A | 1979-05-08 | |||
| JPS61147916A | 1986-07-05 | |||
| US3350911A | 1967-11-07 | |||
| US3180124A | 1965-04-27 |
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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