US3979815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of shaping sheet metal of inferior formability
Assignee: Nissan Motor Co Ltd
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Filing: 1975-07-11
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Granted: 1976-09-14
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Expires: 1995-07-11
Abstract
Abstract In regard to sheet metals of inferior formability as typified by titanium alloys, each end face of a blank is covered with a cover plate of a metal which surpasses the blank material in formability, and the covered blank is subjected to a usual shaping operation in which the steps of heating the blank and pressing the heated blank are cycled a plurality of times, so that the blank can be protected against contamination attributable to exposure of the hot blank to the atmosphere and hence saved from having a large margin in the thickness thereof. A lubricant layer is preferably formed between the blank and each cover plate for a further improvement on the formability.
Inventors
- 👤 Megumi Nakanose
- 👤 Tsuneo Kakimi
- 👤 Michiyoshi Shiraishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:29
CPC Classifications
B; B21; B21D; B21D26/00; B21D26/02; B21D26/053; B21D26/055; B21D22/00; B21D22/20; Y; Y10; Y10S; Y10S29/00; Y10S29/045; Y10S428/00; Y10S428/922; Y10S428/923; Y10T; Y10T29/00; Y10T29/49; Y10T29/49805; Y10T29/4981; Y10T428/00; Y10T428/12; Y10T428/12229; Y10T428/12271; Y10T428/12292; Y10T428/12306; Y10T428/12319; Y10T428/12326; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12556; Y10T428/12597; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31906
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
171 words
A method of shaping a sheet metal of a comparatively inferior formability, comprising the steps of: enclosing a blank of the sheet metal in an air-tight sealed holder of another metal surpassing the sheet metal in formability, said holder including a top plate and a bottom plate arranged parallel to the top and bottom end faces respectively of said blank, said holder also including a frame surrounding the side of said blank and connecting said top and bottom plates, said frame having a height greater than the thickness of said blank and a cross-sectional area larger than the end face area of said blank to thereby have a space in said holder around said blank; filling said space with a filler capable of being in a liquid phase at least at an elevated temperature; heating the assembly of said holder, blank, and filler to a temperature above said elevated temperature; and exerting a load on said top plate of the heated assembly so that said load is transmitted to said blank.
Claim 2
Independent Claim
171 words
A method of shaping a sheet metal of a comparatively inferior formability, comprising the steps of: enclosing a blank of the sheet metal in an air-tight sealed holder of another metal surpassing the sheet metal in formability, said holder including a top plate and a bottom plate arranged parallel to the top and bottom end faces respectively of said blank, said holder also including a frame surrounding the side of said blank and connecting said top and bottom plates, said frame having a height greater than the thickness of said blank and a cross-sectional area larger than the end face area of said blank to thereby have a space in said holder around said blank; filling said space with a filler capable of being in a liquid phase at least at an elevated temperature; heating the assembly of said holder, blank, and filler to a temperature above said elevated temperature; and exerting a load on said top plate of the heated assembly so that said load is transmitted to said blank.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1 wherein said another metal is selected from the group consisting of mild steels and stainless steels.
Claim 4
Dependent Claim
20 words
A method as claimed in claim 1 wherein said filler is selected from the group consisting of oils and fats.
Claim 5
Dependent Claim
26 words
A method as claimed in claim 1 wherein said filler is selected from the group consisting of tin, lead, aluminum, zinc, their mixtures and their alloys.
Claim 6
Dependent Claim
14 words
A method as claimed in claim 1 wherein said filler is a chloride glass.
Claim 7
Dependent Claim
19 words
A method as claimed in claim 1 wherein said bottom plate has a larger thickness than said top plate.
Claim 8
Dependent Claim
27 words
A method as claimed in claim 1 wherein said top and bottom plates and the outer side of said frame are similar in contour to said blank.
Claim 9
Dependent Claim
16 words
A method as claimed in claim 1 wherein said sheet metal blank is a titanium alloy.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |