US3818578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of casting and working a billet having a plurality of openings therein
Assignee: Cryomagnetics Corp
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Filing: 1971-09-24
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Granted: 1974-06-25
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Expires: 1991-09-24
Abstract
Abstract A plurality of rods are assembled in a predetermined configuration to form a core which is surrounded by a molten matrix metal within a heated crucible. The temperature of the thusly charged crucible''s upper portion is maintained above the matrix metal''s melting point. In this respect, as the heat is applied to the top of the melt, the crucible is maintained in a hot environment while the bottom of the crucible is centrally chilled. In this manner the charge is solidified from the bottom toward the top so that the solidification progresses upwardly and outwardly in a conical pattern. After the controlled solidification is completed the casting is separated from the crucible to form a cored extrusion billet. In one embodiment the rods are separated from the casting and the resulting open holes are filled with superconductive material to form a composite superconductor extrusion billet. In another embodiment the rods themselves are made of a superconductive material so as to eliminate the step of separating the rods from the casting.
Inventors
- 👤 J Raymond
- 👤 C Whetstone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:21
CPC Classifications
H; H01; H01B; H01B12/00; H01B12/02; H01B12/10; H10; H10N; H10N60/00; H10N60/01; H10N60/0128; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/912; Y10S505/913; Y10S505/915; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014; Y10T29/4998; Y10T29/49988
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
171 words
A method of making a cast billet having a plurality of openings therein and suitable for use in forming a composite superconductor, said method comprising the steps of: creating a melt of matrix metal in a form; locating an array of preheated hole-shaping removable rods in said melt of matrix metal in a form such that the melt envelopes the array of rods; sensing the temperature of said form at predetermined points running from the bottom to the top thereof; controlling the solidification of said melt of matrix metal from the bottom of said form toward the top thereof in accordance with said sensed temperature in a manner such that said solidification progresses upwardly in the pattern of a cone so as to eliminate undesired voids and casting defects, and obtain a nonporous uniform billet; separating the solidified matrix metal and said array of rods from said form to provide a cast billet suitable for manufacturing into a composite superconductor product; and, working said cast billet to reduce its cross section.
Claim 2
Independent Claim
171 words
A method of making a cast billet having a plurality of openings therein and suitable for use in forming a composite superconductor, said method comprising the steps of: creating a melt of matrix metal in a form; locating an array of preheated hole-shaping removable rods in said melt of matrix metal in a form such that the melt envelopes the array of rods; sensing the temperature of said form at predetermined points running from the bottom to the top thereof; controlling the solidification of said melt of matrix metal from the bottom of said form toward the top thereof in accordance with said sensed temperature in a manner such that said solidification progresses upwardly in the pattern of a cone so as to eliminate undesired voids and casting defects, and obtain a nonporous uniform billet; separating the solidified matrix metal and said array of rods from said form to provide a cast billet suitable for manufacturing into a composite superconductor product; and, working said cast billet to reduce its cross section.
Claim 3
Dependent Claim
76 words
The method of claim 1 including the steps of: separating said array of rods from said matrix metal subsequent to separating said solidified matrix metal and said array of rods from said form to leave open holes in said cast billet and prior to working said cast billet to reduce its cross section; and, working said extrusion billet to form a slender elongate product subsequent to the working of said billet to Reduce its cross section.
Claim 4
Dependent Claim
96 words
The method of claim 1 wherein said controlled solidification includes the steps of: cooling the melt of molten matrix metal at the bottom while: i. maintaining said form in a hot environment above the melting point of said molten matrix metal; and, ii. heating said form at the top of said melt to maintain the temperature thereof above the melting point of said molten matrix metal until the top of said melt solidifies; and, working said extrusion billet for form a slender elongate product subsequent to the working of said billet to reduce its cross section.
Claim 5
Dependent Claim
30 words
The method of claim 1 including the step of adding to said melt an alloy material in a predetermind amount corresponding to a predetermined resistivity ratio of the resulting product.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |