US3797101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making die castings having multi-layer coated surfaces
Assignee: Farley Inc
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Filing: 1972-11-27
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Granted: 1974-03-19
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Expires: 1992-11-27
Abstract
Abstract This invention relates to a method for producing coated die castings, for example, die cast cylinders or housings for rotary or reciprocating internal combustion engines. The method is particularly directed to the production of a casting having a multiple layer coating wherein the layer exposed to the working surface of the cylinder or housing is of a material which will provide a very hard, wear resistant layer, and the underlayer, between the die casting and the wear resistant layer is of a softer, less expensive, highly adherent and physically strong material.
Inventors
- 👤 A Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:20
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/0009; F; F02; F02B; F02B53/00; F02B2053/005; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49982; Y10T29/49984; Y10T29/49988; Y10T29/49989
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A method for producing a die casting which comprises applying to a die casting core a relatively thin hard metal coating having a rough and pitted exposed surface, applying to the hard metal coating, and into interlocking engagement with the rough and pitted surface thereof, a relatively thicker backing coating of a metal which is strong, highly adherent, and softer than said hard metal having a rough and pitted exposed surface, positioning the coated core in a die, introducing under die casting pressure a metal having a lower melting temperature than that of either of the coatings into the die and into interlocking engagement with the rough and pitted surface of the metal coating on the core, solidifying the introduced metal, and separating the core from the hard metal layer whereby the interior of the die casting exhibits the hard wear resistant character of the thin initial coating.
Claim 2
Independent Claim
148 words
A method for producing a die casting which comprises applying to a die casting core a relatively thin hard metal coating having a rough and pitted exposed surface, applying to the hard metal coating, and into interlocking engagement with the rough and pitted surface thereof, a relatively thicker backing coating of a metal which is strong, highly adherent, and softer than said hard metal having a rough and pitted exposed surface, positioning the coated core in a die, introducing under die casting pressure a metal having a lower melting temperature than that of either of the coatings into the die and into interlocking engagement with the rough and pitted surface of the metal coating on the core, solidifying the introduced metal, and separating the core from the hard metal layer whereby the interior of the die casting exhibits the hard wear resistant character of the thin initial coating.
Claim 3
Dependent Claim
88 words
A method as claimed in claim 1 wherein the thickness of the hard metal coating on the core is controlled to one sufficiently thin that absent the metal backing coating, a given compressive force applied thereto when the finished casting is heated causes separation of the hard metal coating and the die cast metal, and the thickness of the metal backing coating is controlled to one at which the given compressive force applied to the hard metal layer when the finished casting is heated does not cause separation.
Claim 4
Dependent Claim
31 words
A method as claimed in claim 1 wherein a dry particulate release agent is applied to the die casting core prior to application thereto of the layer of a hard metal.
Claim 5
Dependent Claim
33 words
A method as claimed in claim 1 wherein a metal coating is applied to the die casting core as a separation layer prior to application thereto of the layer of a hard metal.
Claim 6
Dependent Claim
47 words
A method as claimed in claim 1 wherein a thin coating of a metal is first applied to the die casting core, said metal having a lower melting temperature than that of the hard metal, and the hard metal coating is then applied to the metal coating.
Claim 7
Dependent Claim
38 words
A method as claimed in claim 5 wherein, after separation of the core from the casting, the metal coating that was first applied to the core is removed by a machining operation to expose the hard metal coating.
Claim 8
Dependent Claim
38 words
A method as claimed in claim 4 wherein, after separation of the core from the casting, the metal coating that was first applied to the core is removed by a machining operation to expose the hard metal coating.
References Cited (Backward Citations)
US2074007A
Cited
US3099869A
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US3083424A
Cited
US3401736A
Cited
US3433284A
Cited
US3689986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |