US3751957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Press for hydrostatic extrusion of tubes
Assignee: ABB Norden Holding AB
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Filing: 1972-02-10
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Granted: 1973-08-14
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Expires: 1992-02-10
Abstract
Abstract A press for hydrostatic extrusion of tubes has a pressure chamber containing a pressure generating fluid and a spacer element arranged in the cylinder with a mandrel axially fixed at its inner end by the spacer tube. The mandrel has a point part cooperating with the die in the cylinder. This point part of the die has a smaller cross-section than the rear part of the die, which rear part is secured to a support from which it is separate. The joint between the support and the inner end of the die is sealed. The pressure exerted by the pressure fluid on the larger part of the mandrel in a direction away from the die is greater than the frictional force between the billet being extruded and the point of the mandrel.
Inventors
- 👤 J Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:37
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/007
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
Press for hydrostatic extrusion of tubes, having a pressure chamber containing a high-pressure cylinder, a pressuregenerating punch insertable in the cylinder, a die arranged in the cylinder, a spacer element arranged in the cylinder and a mandrel axially fixed at its inner end by the spacer element, the mandrel having a point part cooperating with the die to form a gap in which a tubular billet is shaped to a tube when it is subjected to an all-sided hydrostatic pressure, the part of the mandrel projecting into the die having a smaller cross-section than the rear part, and a support member separate from the mandrel, the inner end of the mandrel abutting the support member, and means sealing such abutting inner end in a liquidtight manner with respect to said support member.
Claim 2
Dependent Claim
132 words
Press for hydrostatic extrusion of tubes, having a pressure chamber containing a high-pressure cylinder, a pressuregenerating punch insertable in the cylinder, a die arranged in the cylinder, a spacer element arranged in the cylinder and a mandrel axially fixed at its inner end by the spacer element, the mandrel having a point part cooperating with the die to form a gap in which a tubular billet is shaped to a tube when it is subjected to an all-sided hydrostatic pressure, the part of the mandrel projecting into the die having a smaller cross-section than the rear part, and a support member separate from the mandrel, the inner end of the mandrel abutting the support member, and means sealing such abutting inner end in a liquidtight manner with respect to said support member.
Claim 3
Dependent Claim
32 words
Press according to claim 1, in which the inner end of the mandrel has a larger cross-section than the point part and said support includes a plate resting on the spacer element.
Claim 4
Dependent Claim
14 words
Press according to claim 2, in which the mandrel has a conical rear part.
Claim 5
Dependent Claim
25 words
Press according to claim 2, in which the side of the plate facing the die is shaped with a guide surface to center the mandrel.
Claim 6
Dependent Claim
24 words
Press according to claim 4, in which said sealing means comprises an annular seal arranged to seal between the mandrel and the guide surface.
Claim 7
Dependent Claim
16 words
Press according to claim 3, which includes mechanical retaining members securing the mandrel to the plate.
Claim 8
Dependent Claim
15 words
Press according to claim 1, in which the mandrel is conical adjacent the front part.
Claim 9
Dependent Claim
39 words
Press according to claim 1, in which the point portion has a smaller cross-section than a following part and means are provided sealing the point of the mandrel in a liquid-tight manner to the following part of the mandrel.
Claim 10
Dependent Claim
35 words
Press according to claim 8, including a sleeve bridging the joint between the point part and the following part of the mandrel, said sealing means sealing said sleeve to both said parts of the mandrel.
Claim 11
Dependent Claim
23 words
Press according to claim 9, in which said sleeve has grooves therein and said sealing means comprises rings in grooves in the sleeve.
Claim 12
Dependent Claim
18 words
Press according to claim 1, in which the mandrel is provided with a drainage channel extenDing longitudinally therethrough.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |