US3807012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a composite roller for hot and cold rolling
Assignee: Fagersta AB
•
Filing: 1972-11-13
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Granted: 1974-04-30
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Expires: 1992-11-13
Abstract
Abstract A method for making a roller for hot and cold rolling by placing at least the radial inner portion of a hard metal ring in a mold cavity, heating the mold cavity and the hard metal ring and casting therearound, at least at the inner part of the radial sides of the inner ring, an annular hub of ferrous alloy. After casting, the hub and the hard metal ring are cooled, the hub shrinking more than the hard metal ring so as to exert compression forces thereagainst to hold the same in place.
Inventors
- 👤 K Loqvist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:13
CPC Classifications
B; B21; B21B; B21B27/00; B21B27/02; B21B27/03; B21B27/035; B23; B23P; B23P17/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49544; Y10T29/49547; Y10T29/49549; Y10T29/49552; Y10T29/4956; Y10T29/49563; Y10T29/4998; Y10T29/49988
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
128 words
A method of making a roller for hot and cold rolling comprising the steps of: providing a hard metal ring, the crosssection of which decreases radially outwardly, positioning this ring with at least its radial inner part located in an annular mold cavity, heating the mold and the hard metal ring, and while they are heated filling the mold with a molten ferrous alloy material such that the ferrous alloy is formed into an annular hub, the outermost part of which fits tightly against the outwardly converging sides of the inner part of the hard metal ring, and cooling the ferrous alloy and the hard metal ring slowly such that the ferrous alloy hub shrinks against the hard metal ring to exert compressive forces thereagainst without becoming brittle.
Claim 2
Independent Claim
128 words
A method of making a roller for hot and cold rolling comprising the steps of: providing a hard metal ring, the crosssection of which decreases radially outwardly, positioning this ring with at least its radial inner part located in an annular mold cavity, heating the mold and the hard metal ring, and while they are heated filling the mold with a molten ferrous alloy material such that the ferrous alloy is formed into an annular hub, the outermost part of which fits tightly against the outwardly converging sides of the inner part of the hard metal ring, and cooling the ferrous alloy and the hard metal ring slowly such that the ferrous alloy hub shrinks against the hard metal ring to exert compressive forces thereagainst without becoming brittle.
Claim 3
Dependent Claim
26 words
The method of claim 1, including the steps of heating the mold with the hard metal ring positioned therein before adding the molten ferrous alloy material.
Claim 4
Dependent Claim
34 words
The method of claim 1, wherein during cooling, an annular cleft is formed between the hard metal ring and the hub and including the steps of filling this space with a suitable supporting material.
Claim 5
Dependent Claim
23 words
The method of claim 1, wherein the hard metal ring and the mold cavity are heated to a temperature of approximately 600* C.
Claim 6
Dependent Claim
27 words
A method according to claim 1, wherein the said cooling step comprises adding heat to the hard metal ring while cooling the inner portion of the hub.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |