US4413406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing amorphous metal into packets by bonding with low melting point material
Assignee: General Electric Co
•
Filing: 1981-03-19
•
Granted: 1983-11-08
•
Expires: 2001-03-19
Abstract
Abstract A method for forming cores for an electrical transformer is disclosed. Also disclosed are the cores made from such a method. In one embodiment an amorphous metal core has relatively thick superimposed laminations comprised of relatively thin amorphous metal sheets. The amorphous metal sheets are heated and bonded together by a metallic bonding agent to form relatively thick amorphous metal packets for the superimposed laminations of the core. The heating and bonding of the amorphous metal sheets reduce the mechanical stresses normally induced into the amorphous metal during the fabrication process. In another embodiment a hybrid core has superimposed laminations certain of which comprise sheets of non-crystalline amorphous metal and one or more sheets of crystalline silicon steel metal.
Inventors
- 👤 Moreland P. Bennett
- 👤 Donald E. Ballard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:23
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/25; B; B32; B32B; B32B37/00; B32B37/12; B32B37/1284; B32B37/1292; H01F41/00; H01F41/02; H01F41/0206; H01F41/0213; H01F41/0226; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49078
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
237 words
A method of forming an amorphous metal core for an electromagnetic device having relatively thick superimposed amorphous metal laminations comprised of a plurality of superimposed relatively thin amorphous metal sheets, said method comprising the steps of: (a) providing a plurality of amorphous metal sheets of extended length and positioning said sheets adjacent each other so that immediately-adjacent sheets have confronting surfaces; (b) applying to at least one confronting surface of each pair of immediately-adjacent sheets a deposit of metallic material having a melting temperature within the range of 50° to 350° C.; (c) bringing together said plurality of amorphous metal sheets into a composite sheet having a thickness corresponding to the approximate thickness of one of said laminations; (d) applying heat to said composite sheet so as to elevate its temperature to a value greater than the melting temperature of said deposit but less than the critical temperature of the amorphous metal sheets which would otherwise cause the amorphous metal to make a transition from its non-crystalline state to its crystalline state; (e) allowing sufficient cooling of said composite sheet to cause the deposit to solidify and bond together the sheets of said composite sheet; (f) cutting said composite sheet transversely of its length into packets of predetermined lengths corresponding to the desired lengths of said amorphous metal laminations, and; (g) arranging said packets into said superimposed laminations having a desired shape for said amorphous metal core.
Claim 2
Independent Claim
237 words
A method of forming an amorphous metal core for an electromagnetic device having relatively thick superimposed amorphous metal laminations comprised of a plurality of superimposed relatively thin amorphous metal sheets, said method comprising the steps of: (a) providing a plurality of amorphous metal sheets of extended length and positioning said sheets adjacent each other so that immediately-adjacent sheets have confronting surfaces; (b) applying to at least one confronting surface of each pair of immediately-adjacent sheets a deposit of metallic material having a melting temperature within the range of 50° to 350° C.; (c) bringing together said plurality of amorphous metal sheets into a composite sheet having a thickness corresponding to the approximate thickness of one of said laminations; (d) applying heat to said composite sheet so as to elevate its temperature to a value greater than the melting temperature of said deposit but less than the critical temperature of the amorphous metal sheets which would otherwise cause the amorphous metal to make a transition from its non-crystalline state to its crystalline state; (e) allowing sufficient cooling of said composite sheet to cause the deposit to solidify and bond together the sheets of said composite sheet; (f) cutting said composite sheet transversely of its length into packets of predetermined lengths corresponding to the desired lengths of said amorphous metal laminations, and; (g) arranging said packets into said superimposed laminations having a desired shape for said amorphous metal core.
Claim 3
Dependent Claim
35 words
The method of claim 1 in which said composite sheet is subjected to a compressive force to cause spreading of said deposit of metallic material thereby facilitating bonding together the sheets of said composite sheet.
Claim 4
Dependent Claim
23 words
The method of claim 1 in which cutting of said composite sheet is effected while said composite sheet is at an elevated temperature.
Claim 5
Dependent Claim
25 words
A method according to claim 1 wherein said packets are arranged into said superimposed laminations by positioning the packets to form a stacked type core.
Claim 6
Dependent Claim
32 words
A method according to claim 4 wherein said sheets are arranged into a staggered configuration when brought together to form said composite sheet so that the sheets in said packets are staggered.
Claim 7
Dependent Claim
27 words
A method according to claim 1 wherein said packets are arranged into said superimposed laminations by wrapping the packets about a mandrel to form a wound-type core.
Claim 8
Dependent Claim
35 words
A method according to claim 6 wherein the amorphous metal sheets forming each packet are subjected to a heating operation that unbonds the sheets from each other prior to wrapping the packets about said mandrel.
Claim 9
Dependent Claim
37 words
A method according to claim 7 wherein the amorphous metal sheets forming each packet are arranged into a staggered configuration when brought together to form said composite sheet so that the sheets in said packets are staggered.
Claim 10
Dependent Claim
49 words
A method according to claim 7 wherein the packets that are wrapped about said mandrel are subjected to forces so as to change the shape of the packets from the form of the mandrel to a form desired for the final shape of the superimposed laminations of the core.
Claim 11
Dependent Claim
56 words
A method according to claim 8 wherein the packets that are wrapped about said mandrel having sheets arranged in a staggered configuration are subjected to forces so as to change the shape of the packets from the form of the mandrel to a form desired for the final shape of the superimposed laminations of the core.
Claim 12
Dependent Claim
30 words
A method according to claim 9 wherein the superimposed laminations are further subjected to an annealing step so as to reduce the stresses in the sheets contained in the core.
Claim 13
Dependent Claim
30 words
A method according to claim 10 wherein the superimposed laminations are further subjected to an annealing step so as to reduce the stresses in the sheets contained in the core.
Claim 14
Dependent Claim
30 words
A method according to claim 6 wherein the superimposed laminations are further subjected to an annealing step so as to reduce the stresses in the sheets contained in the core.
Claim 15
Dependent Claim
30 words
A method according to claim 4 wherein the superimposed laminations are further subjected to an annealing step so as to reduce the stresses in the sheets contained in the core.
Claim 16
Dependent Claim
28 words
A method according to claim 5 wherein the superimposed laminations are further subjected to an annelaing step to reduce the stresses in the sheet contained in the core.
Claim 17
Dependent Claim
74 words
The method of any one of claims 1 through 8 in which: (a) at least one sheet of crystalline steel is included within said composite sheet in a position immediately-adjacent one or more amorphous metal sheets and is bonded to said immediately-adjacent amorphous metal sheet or sheets, and (b) the crystalline sheet is cut by the cutting step of (f) of claim 1 so that the packets include a section of said crystalline sheet.
References Cited (Backward Citations)
US2334131A
Cited
US2479325A
Cited
US3043000A
Cited
US3550266A
Cited
US4155397A
Cited
US4288773A
Cited
US4219355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |