Patent US4212189A successfully refreshed from Google Patents.
US4212189A
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Tool for isothermal forging
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1978-08-08
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Granted: 1980-07-15
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Expires: 1998-08-08
Abstract
Abstract A tool for isothermal forging is disclosed. The tool consists of two die halves, at least one of which consists of an assembly of individual components whose side facing the workpiece is provided with a thin electrically insulating layer. The assembly of the die half from individual components occurs following forming of the components by casting and/or forging, and machining of the formed components. The forming of the die halves from separate components makes it possible to adapt the components of the die half to the particular working conditions in an optimum manner. The provision of an insulating layer on the individual components reduces the risk of local welding and nonuniform temperature distribution during inductive heating.
Inventors
- 👤 Walter Fuchs
- 👤 Gernot H. Gessinger
- 👤 Roland Kunzli
- 👤 Erwin Schonfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:20
CPC Classifications
B; B21; B21J; B21J13/00; B21J13/02; B21K; B21K5/00; B21K5/20; B23; B23P; B23P15/00; B23P15/24
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
59 words
Tool for isothermal forging, consisting of two die halves, at least one of which is divided at least once, characterised in that the divided die half is assembled from individual components, of which at least those individual components which face the workpiece to be forged are provided with a thin, electrically insulating layer on at least their contact surfaces.
Claim 2
Dependent Claim
59 words
Tool for isothermal forging, consisting of two die halves, at least one of which is divided at least once, characterised in that the divided die half is assembled from individual components, of which at least those individual components which face the workpiece to be forged are provided with a thin, electrically insulating layer on at least their contact surfaces.
Claim 3
Dependent Claim
50 words
Tool according to claim 1, characterised in that the electrically insulating layer consists of a mixture of at least one from the group consisting of Al 2 O 3 , MgO, SiO 2 , CeO 2 or Y 2 O 3 and has a thickness of 0.01 to 500 μ.
Claim 4
Dependent Claim
21 words
Tool according to claim 1, characterised in that the individual components of the divided die half consist of the same material.
Claim 5
Dependent Claim
44 words
Tool according to claim 1, characterised in that the components which face the workpiece to be forged consist of a material having a higher hot strength and a higher wear resistance than that of the components facing away from the workpiece to be forged.
Claim 6
Dependent Claim
27 words
Tool according to claim 4, characterised in that the components of the divided die half, which face the workpiece to be forged, consist of a molybdenum alloy.
Claim 7
Dependent Claim
22 words
Tool according to claim 5, characterised in that the molybdenum alloy contains 0.4-0.55% of Ti, 0.06-0.12% of Zr and 0.01-0.04% of C.
Claim 8
Dependent Claim
22 words
Tool according to claim 5, characterised in that the molybdenum alloy contains 1.0-1.4% of Ti, 0.25-0.35% of Zr and 0.07-0.13% of C.
Claim 9
Dependent Claim
19 words
Tool according to claim 5, characterised in that the molybdenum alloy contains 1.0-1.12% of Hf and 0.06-0.0675% of C.
Claim 10
Dependent Claim
29 words
Tool according to claim 4, characterised in that the components of the divided die half, which face the workpiece to be forged, consist of a high-temperature resistant nickel alloy.
Claim 11
Dependent Claim
62 words
Tool according to claim 9, characterised in that the nickel alloy contains 0.16 to 0.20% of C, 9 to 11% of Cr, 14 to 16% of Co, 2.6 to 3.5% of Mo, 4.2 to 5.0% of Ti, 5 to 6% of Al, 0.012 to 0.014% of B, 0.05 to 0.07% of Zr and 0.9 to 1.1% of V, the remainder being Ni.
Claim 12
Dependent Claim
57 words
Tool according to claim 9, characterised in that the nickel alloy contains 0.04 to 0.06% of C, 11 to 13% of Cr, 4 to 5% of Mo, 1.8 to 2.2% of Nb, 0.5 to 0.7% of Ti, 5.5 to 6.4% of Al, 0.008 to 0.012% of B and 0.08 to 0.12% of Zr, the remainder being Ni.
Claim 13
Dependent Claim
29 words
Tool according to claim 4, characterised in that, the components of the divided die half, which face away from the workpiece to be forged, consist of a nickel alloy.
Claim 14
Dependent Claim
47 words
Tool according to claim 12, characterised in that the nickel alloy contains 0.13 to 0.17% of C, 14 to 16% of Cr, 14 to 16% of Co, 3 to 4% of Mo, 3.5 to 4.5% of Ti and 4.5 to 5.5% of Al, the remainder being Ni.
Claim 15
Dependent Claim
62 words
Tool according to claim 12, characterised in that the nickel alloy contains 0.04 to 0.06% of C, 0.13 to 0.17% of Mn, 0.25 to 0.35% of Si, 20 to 24% of Cr, 8 to 10% of Mo, 3.5 to 4.5% of Nb, 2.5 to 3.5% of Fe, 0.18 to 0.22% of Ti and 0.18 to 0.22% of Al, the remainder being Ni.
Claim 16
Dependent Claim
30 words
Tool according to claim 4, characterised in that the components of the divided die half, which face away from the workpiece to be forged, consist of a stainless austenitic steel.
Claim 17
Dependent Claim
74 words
Tool according to claim 15, characterised in that the stainless austenitic steel contains a maximum of 0.1% of C, a maximum of 1% of Si, a maximum of 2.0% of Mn, a maximum of 0.045% of P, a maximum of 0.030% of S, 17 to 19% of Cr, 9 to 11.5% of Ni, a minimum of (5×% of C)% of Ti and a minimum of (8×% of C)% of Nb, the remainder being Fe.
Claim 18
Dependent Claim
30 words
Tool according to claim 4, characterised in that the components of the divided die half, which face away from the workpiece to be forged, consist of a stainless ferritic steel.
Claim 19
Dependent Claim
77 words
Tool according to claim 17, characterised in that the stainless ferritic steel contains 0.2 to 0.26% of C, 0.1 to 0.5% of Si, 0.3 to 0.8% of Mn, a maximum of 0.035% of P, a maximum of 0.035% of S, 11 to 12.5% of Cr, 0.3 to 0.8% of Ni, 0.8 to 1.2% of Mo, 0.25 to 0.35% of V, a maximum of 0.6% of W and a maximum of 0.05% of Nb, the remainder being Fe.
Claim 20
Dependent Claim
39 words
Tool according to claim 4, characterised in that the components of the divided die half, which face away from the workpiece to be forged, consist of a hot-work tool steel from the group consisting of Cr/W, Cr/Mo and Cr/Ni.
Claim 21
Dependent Claim
43 words
Tool according to claim 19, characterised in that the hot-work tool steel contains 0.35 to 0.45% of C, 0.8 to 1.2% of Si, 5.0 to 5.5% of Cr, 1.2 to 1.6% of Mo and 0.8 to 1.2% of V, the remainder being Fe.
Claim 22
Dependent Claim
28 words
Tool according to claim 1, characterised in that at least a part of the individual components of the divided die half consists of segment-like pieces of identical shape.
Claim 23
Dependent Claim
33 words
Tool for isothermal forging according to claim 1, in which at least those individual components which face the workpiece to be forged are provided with a thin, electrically insulating layer on all sides.
Claim 24
Dependent Claim
28 words
Tool according to claim 1 characterised in that at least a part of the individual components of the divided die half consists of segment-like pieces of different shape.
Claim 25
Dependent Claim
12 words
Tool according to claim 21 or 23 having flanks which extend radially.
Claim 26
Dependent Claim
12 words
Tool according to claim 21 or 23 having flanks which extend obliquely.
Claim 27
Dependent Claim
14 words
Tool according to claim 21 or 23 having flanks which extend in an arc.
Claim 28
Dependent Claim
88 words
A process for the production of a tool for isothermal forging, said tool comprising two die halves, at least one of which is divided at least once, the portions of said tool which face the workpiece being provided with a thin electrically insulating layer, said process comprising the steps of: forming individual components of each said at least one die half by casting and/or forging; machining said components; forming said insulating layer on said components; and assembling each said at least one die half from said individual components.
Claim 29
Dependent Claim
88 words
A process for the production of a tool for isothermal forging, said tool comprising two die halves, at least one of which is divided at least once, the portions of said tool which face the workpiece being provided with a thin electrically insulating layer, said process comprising the steps of: forming individual components of each said at least one die half by casting and/or forging; machining said components; forming said insulating layer on said components; and assembling each said at least one die half from said individual components.
Claim 30
Dependent Claim
40 words
Process according to claim 27, characterised in that the components which face the workpiece to be forged are individually subjected to fine finishing by grinding and are then provided with an electrically insulating layer which is 0.01 to 500μ thick.
Claim 31
Dependent Claim
31 words
Process according to claim 27, characterised in that the parts of the die halves are brought into the raw shape by forging and are converted into the final form by machining.
Claim 32
Dependent Claim
40 words
Process according to claim 27, characterised in that the components which face the workpiece to be forged are individually subjected to fine finishing by polishing and are then provided with an electrically insulating layer which is 0.01 to 500μ thick.
Claim 33
Dependent Claim
17 words
Process according to claim 28 or 30 in which the electrically insulating layer is applied by plasma-spraying.
Claim 34
Dependent Claim
17 words
Process according to claim 28 or 30 in which the electrically insulating layer is applied by flame-spraying.
Claim 35
Dependent Claim
18 words
Process according to claim 28 or 30 in which the electrically insulating layer is applied by cathode sputtering.
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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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |