Patent US3747384A successfully refreshed from Google Patents.
US3747384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined method of area reduction
Assignee: ABB Norden Holding AB
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Filing: 1972-03-09
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Granted: 1973-07-24
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Expires: 1992-03-09
Abstract
Abstract In the hydrostatic extrusion of a body through an opening, such as a die opening, the hydrostatic extrusion is begun by raising the pressure of the pressure fluid to a predetermined amount, and thereafter while continuing such pressure applying a tensile force to a portion of the body which is beyond the opening. The portion extending through the die may be preformed, or may be formed by the starting of hydrostatic extrusion. The end of the billet which engages the die is formed with double conicity.
Inventors
- 👤 J Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:22
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/007
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A method for reducing the area of a body which is to be passed through an opening of less cross-section than that of the body, said method being a combination of hydrostatically extruding the body through the opening and applying a tensile force for pulling said body through said opening, which comprises starting the extrusion as hYdrostatic extrusion only to extrude a minor part of the body through the opening, thereafter applying tensile means upon the extruded part of the body, thereafter increasing the extrusion pressure to a certain value and thereafter applying a tensile force to obtain a movement of the body through the opening with area reduction.
Claim 2
Independent Claim
109 words
A method for reducing the area of a body which is to be passed through an opening of less cross-section than that of the body, said method being a combination of hydrostatically extruding the body through the opening and applying a tensile force for pulling said body through said opening, which comprises starting the extrusion as hYdrostatic extrusion only to extrude a minor part of the body through the opening, thereafter applying tensile means upon the extruded part of the body, thereafter increasing the extrusion pressure to a certain value and thereafter applying a tensile force to obtain a movement of the body through the opening with area reduction.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1, in which the body has a double conical point at the front end.
Claim 4
Dependent Claim
34 words
A method as claimed in claim 1, which comprises maintaining the hydrostatic extrusion pressure substantially constant after exertion of the tensile force begins and varying the tensile force to control the rate of extrusion.
Claim 5
Dependent Claim
15 words
A method as claimed in claim 1, which comprises maintaining the tensile force substantially constant.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |