US4386971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing a finished component from an Ni/Ti or Ni/Ti/Cu memory alloy
Assignee: BBC BROWN BOVERI & COMPANY Ltd
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Filing: 1982-03-03
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Granted: 1983-06-07
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Expires: 2002-03-03
Abstract
Abstract Finished components made from Ni/Ti or Ni/Ti/Cu memory alloys can be manufactured by isothermal or quasi-isothermal ("hot die") working of sections of semifinished product, and by subsequent additional cold-working in the temperature region of the martensitic transformation by flow-turning, tapering, necking, ironing or spinning, it being possible to dispense, completely or at least to a large extent, with an additional machining operation of the metal-cutting type. Manufacture of complicated connecting elements, using the memory effect, for connecting rods, tubes, plates, etc.
Inventors
- 👤 Keith Melton
- 👤 Olivier Mercier
- 👤 Gunther Schroder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:37
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/006
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
A process for manufacturing a finished component from an Ni/Ti or Ni/Ti/Cu memory alloy which comprises processing semifinished product in the form of rod or wire, through several working steps, in the hot state and in the cold state, wherein a blank, in the form of a section of semifinished product, is initially subjected to a hot-working operation in the temperature range from 500° to 1,300° C., while simultaneously maintaining a die temperature within the temperature range of the blank and 250° C., and wherein a workpiece, which has been shaped in this way, is cooled and is subjected to a further cold-working operation, at a temperature below the martensitic transformation point.
Claim 2
Dependent Claim
112 words
A process for manufacturing a finished component from an Ni/Ti or Ni/Ti/Cu memory alloy which comprises processing semifinished product in the form of rod or wire, through several working steps, in the hot state and in the cold state, wherein a blank, in the form of a section of semifinished product, is initially subjected to a hot-working operation in the temperature range from 500° to 1,300° C., while simultaneously maintaining a die temperature within the temperature range of the blank and 250° C., and wherein a workpiece, which has been shaped in this way, is cooled and is subjected to a further cold-working operation, at a temperature below the martensitic transformation point.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, wherein the hot-working operation is carried out isothermally, at a constant workpiece and die temperature.
Claim 4
Dependent Claim
42 words
A process as claimed in claim 1, wherein the hot-working operation is carried out with a hot die, in such a manner that the temperature difference between the workpiece and the die does not exceed 500° C. during the entire working operation.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1, wherein the hot-working operation is a hot-pressing operation, or a hot-extrusion operation.
Claim 6
Dependent Claim
36 words
A process as claimed in claim 1, wherein the cold-working operation, which must be carried out below the martensitic transformation point, is a reduction of the wall thickness of the workpiece, by flow-turning, or by ironing.
Claim 7
Dependent Claim
36 words
A process as claimed in claim 1, wherein the cold-working operation, which must be carried out below the martensitic transformation point, is a reduction of an external dimension of the workpiece, by tapering, necking, or spinning.
Claim 8
Dependent Claim
33 words
A process as claimed in claim 1, wherein the cold-working operation, which must be carried out below the martensitic transformation point, is an enlargement of an external dimension, by spinning or bulge forming.
Claim 9
Dependent Claim
31 words
A process as claimed in claim 1, wherein the cold-working operation, which must be carried out below the martensitic transformation point, is an enlargement of an internal dimension, by bulge forming.
Claim 10
Dependent Claim
56 words
A process as claimed in claim 1, wherein the workpiece possesses a base or an internal partition, which is perforated, by means of a punching tool, or which is drilled, by means of a cutting tool, in the cold state, or in the hot state, before the workpiece is cooled to below the martensitic transformation point.
Claim 11
Dependent Claim
29 words
A process as claimed in any one of claim 1 to claim 9, wherein a rotationally symmetrical connecting element is produced as the workpiece, said element having circular cross-sections.
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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |