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US3698220A
Expired / Lapsed
US
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Press for hot hydrostatic extrusion
Assignee: ABB Norden Holding AB
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Filing: 1971-05-20
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Granted: 1972-10-17
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Expires: 1991-05-20
Abstract
Abstract A press for hot hydrostatic extrusion of a billet, has a stand, a pressure chamber axially movable in the stand to engage a die mounted in one end against a die support carried by the stand, a punch slidable in the pressure chamber to raise a pressure medium in the pressure chamber to extrusion pressure, and a billet holder slidable in the chamber for pressing the billet against the die during sliding movement of the pressure chamber to closing position. In order to prevent contact between the die support and the die until extrusion is about to begin, with consequent cooling of the billet which interferes with the extrusion, an annular canted spring is arranged in a groove in the face of the die support opposite the die so as to prevent contact therebetween during closing movement of the pressure chamber.
Inventors
- 👤 Jan Nilsson
- 👤 Hans Larker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:22
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/007
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
Press for hydrostatic extrusion comprising a press stAnd, having a die support carried thereby, a high pressure cylinder displaceable axially in the press stand constituting a pressure chamber, a die slidable in between the cylinder and the die support, a pressure-generating punch slidable in the cylinder to generate a pressure necessary for extrusion in a pressure medium enclosed in the pressure chamber and surrounding a billet to be extruded, and a billet holder axially displaceable in the cylinder to retain the billet and the die during a part of the closing movement of the pressure chamber by pressing the billet and the die towards the die support, spring means operatively engaged with the die and the die support to keep the die and die support separated from each other when the die and the billet are held during the closing movement of the pressure chamber until the pressure on the billet exceeds a predetermined amount.
Claim 2
Dependent Claim
155 words
Press for hydrostatic extrusion comprising a press stAnd, having a die support carried thereby, a high pressure cylinder displaceable axially in the press stand constituting a pressure chamber, a die slidable in between the cylinder and the die support, a pressure-generating punch slidable in the cylinder to generate a pressure necessary for extrusion in a pressure medium enclosed in the pressure chamber and surrounding a billet to be extruded, and a billet holder axially displaceable in the cylinder to retain the billet and the die during a part of the closing movement of the pressure chamber by pressing the billet and the die towards the die support, spring means operatively engaged with the die and the die support to keep the die and die support separated from each other when the die and the billet are held during the closing movement of the pressure chamber until the pressure on the billet exceeds a predetermined amount.
Claim 3
Dependent Claim
18 words
Press according to claim 1, in which the spring means comprises an annular spring of the canted type.
Claim 4
Dependent Claim
45 words
Press according to claim 2, in which one of the die supports has an annular groove therein facing the die, said die having a depth which is at least equal to the thickness of the spring material, the annular spring being positioned in said groove.
References Cited (Backward Citations)
US3531965A
Cited
US3563075A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |