US3782159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isostatic working process
Assignee: Peugeot & Renault
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Filing: 1972-06-16
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Granted: 1974-01-01
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Expires: 1992-06-16
Abstract
Abstract The invention relates to a process for the working of pieces of metal by high-pressure isostatic die-stamping. After insertion of the ingot 1 covered with plastic material 2 into the pressure chamber 3 whose walls are constituted by collars 4 and 5 and the floor by the bottom die 6 mounted on the base 7 of the press, the top die 8 is lowered as indicated in FIG. 2, its surface 9 containing the upper shaping impression. During its re-ascent, the top die 8 takes with it the covering 2 and the article 1, which remains adhering to the top die owing to the fact that its die-stamping seam tightly overlaps the residue of covering material 2 in the clearance 11 between the dies 9 and 6.
Inventors
- 👤 C Martinet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:15
CPC Classifications
B; B21; B21J; B21J5/00; B21K; B21K1/00; B21K1/76; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4981
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
A process for isostatic pressure molding of deformable materials in a compression chamber having first and second relatively movable stamping dies, comprising the steps of: covering a workpiece-blank with a plastic material to form an ingot having dimensions which are smaller than the corresponding dimensions of said compression chamber, said plastic covering material being selected to have a plasticity which, in combination with the clearance between said first die and said chamber, produces an extrusion pressure corresponding to the desired isostatic pressure for shaping said workpiece-blank; introducing said ingot into said chamber and covering said chamber to sandwich said ingot between said first and second stamping dies in said chamber; driving one of said dies toward the other die to exert pressure on said ingot to remove said plastic covering material from said workpiece-blank and to deform said workpiece-blank; extruding said plastic covering material outwardly of said chamber between the walls of said first die and said compression chamber; and removing the stamped workpiece and extruded covering material from said chamber.
Claim 2
Dependent Claim
171 words
A process for isostatic pressure molding of deformable materials in a compression chamber having first and second relatively movable stamping dies, comprising the steps of: covering a workpiece-blank with a plastic material to form an ingot having dimensions which are smaller than the corresponding dimensions of said compression chamber, said plastic covering material being selected to have a plasticity which, in combination with the clearance between said first die and said chamber, produces an extrusion pressure corresponding to the desired isostatic pressure for shaping said workpiece-blank; introducing said ingot into said chamber and covering said chamber to sandwich said ingot between said first and second stamping dies in said chamber; driving one of said dies toward the other die to exert pressure on said ingot to remove said plastic covering material from said workpiece-blank and to deform said workpiece-blank; extruding said plastic covering material outwardly of said chamber between the walls of said first die and said compression chamber; and removing the stamped workpiece and extruded covering material from said chamber.
Claim 3
Dependent Claim
34 words
A process as claimed in claim 1, in which the extrusion cross-section between said first die and said compression chamber is varied in order to vary correlatively the isostatic pressure in the compression chamber.
Claim 4
Dependent Claim
22 words
A process as claimed in claim 1, in which the first die is provided with variations of cross-section, decreasing towards its end.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 1, in which the first die is provided with longitudinal ribs ensuring its centering without play in the compression chamber.
Claim 6
Dependent Claim
27 words
A process as claimed in claim 1, in which the stamped workpiece and the extruded covering material remain adhering to the first die during the withdrawal thereof.
Claim 7
Dependent Claim
40 words
A process as claimed in claim 5, in which a removal plate ensures the separation from the first die of the extruded covering material and of the stamped workpiece, said material and said workpiece being collected by said removal tray.
Claim 8
Dependent Claim
28 words
A process as claimed in claim 6, in which said removal tray ensures simultaneously the delivery of the next pre-covered workpiece and its insertion into the compression chamber.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |