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US3709014A
Expired / Lapsed
US
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Press for hydrostatic extrusion
Assignee: ABB Norden Holding AB
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Filing: 1971-04-28
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Granted: 1973-01-09
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Expires: 1991-04-28
Abstract
Abstract A press for hydrostatic extrusion includes a press stand and a high pressure cylinder displaceable in the stand. A punch is mounted for movement into the high pressure cylinder to produce the extrusion pressure therein. The billet and die are positioned by a manipulating arrangement between the open end of the high pressure cylinder and a die support, and the cylinder is moved over the billet and die. Pressure fluid is then introduced through the die support and die into the pressure chamber, flow of the fluid out of the chamber being prevented by a valve arrangement or by seating of the billet against the die. The punch is then advanced into the pressure cylinder to produce extrusion.
Inventors
- 👤 T Landa
- 👤 P Syvakari
- 👤 E Westman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:08
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/007
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
205 words
Press for hydrostatic extrusion comprising a press stand, a pressure chamber which is formed by a high pressure cylinder open at one end displaceable in the press stand, a die support at one end of the press stand, a die insertable between the open end of the cylinder and the die support and having an opening to shape a product, a punch projecting into the other end of the cylinder to generate a pressure in a pressure medium enclosed in the pressure chamber necessary for extrusion of a billet, means for operating the pressure-generating punch and the high pressure cylinder, a mechanism for positioning a billet and the die between the open end of the high pressure cylinder and the die support, and a billet holder in the cylinder to hold the billet against the die before the extrusion process, in which the press is provided with insertable and removable means for injecting pressure medium into the pressure chamber through the die support for filling the pressure chamber and placing it under pressure before increasing the pressure to extrusion level by inserting the pressuregenerating punch, and with means to prevent pressure medium from escaping from the pressure chamber while the injection means is being removed.
Claim 2
Dependent Claim
205 words
Press for hydrostatic extrusion comprising a press stand, a pressure chamber which is formed by a high pressure cylinder open at one end displaceable in the press stand, a die support at one end of the press stand, a die insertable between the open end of the cylinder and the die support and having an opening to shape a product, a punch projecting into the other end of the cylinder to generate a pressure in a pressure medium enclosed in the pressure chamber necessary for extrusion of a billet, means for operating the pressure-generating punch and the high pressure cylinder, a mechanism for positioning a billet and the die between the open end of the high pressure cylinder and the die support, and a billet holder in the cylinder to hold the billet against the die before the extrusion process, in which the press is provided with insertable and removable means for injecting pressure medium into the pressure chamber through the die support for filling the pressure chamber and placing it under pressure before increasing the pressure to extrusion level by inserting the pressuregenerating punch, and with means to prevent pressure medium from escaping from the pressure chamber while the injection means is being removed.
Claim 3
Dependent Claim
38 words
Press according to claim 1, in which the means to prevent escape of pressure medium includes a surface on the die engageable with the front part of the billet to form a valve means sealing against the seat.
Claim 4
Dependent Claim
44 words
Press according to claim 1, in which the means to prevent escape of pressure medium includes a valve means in which the die support forms the valve seat and the die is movable with respect to the die support and seals against the seat.
Claim 5
Dependent Claim
42 words
Press according to claim 1, which includes a billet holder which is axially movable in the high pressure cylinder and which centers the billet at its inner end and a spring engaging the billet holder to press the billet against the die.
Claim 6
Dependent Claim
65 words
Press according to claim 1, in which a high pressure seal is provided between the high pressure cylinder and the punch unit, the means for operating the high pressure cylinder and the punch includes means to keep the punch always inserted so far into the high pressure cylinder that its front end is always inside the high pressure seal between the punch and the cylinder.
Claim 7
Independent Claim
146 words
A method of operating a press for hydrostatic extrusion which comprises a press stand, a pressure chamber which is formed by a high pressure cylinder open at one end displaceable in the press stand, a die support at one end of the press stand, and a punch projecting into the cylinder to generate a pressure in a pressure medium enclosed in the pressure chamber necessary for extrusion of a billet, which method comprises inserting a billet and a die between the open end of the high pressure cylinder and the die support, advancing the high pressure cylinder over the billet and the die, injecting pressure medium into the pressure chamber through the die support for filling the pressure chamber and placing it under pressure while preventing pressure medium from escaping from the pressure chamber and increasing the pressure to extrusion level by advancing the pressure-generating punch.
Claim 8
Independent Claim
146 words
A method of operating a press for hydrostatic extrusion which comprises a press stand, a pressure chamber which is formed by a high pressure cylinder open at one end displaceable in the press stand, a die support at one end of the press stand, and a punch projecting into the cylinder to generate a pressure in a pressure medium enclosed in the pressure chamber necessary for extrusion of a billet, which method comprises inserting a billet and a die between the open end of the high pressure cylinder and the die support, advancing the high pressure cylinder over the billet and the die, injecting pressure medium into the pressure chamber through the die support for filling the pressure chamber and placing it under pressure while preventing pressure medium from escaping from the pressure chamber and increasing the pressure to extrusion level by advancing the pressure-generating punch.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |