US3848453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Die for shaping metals
Assignee: Rio Tinto Switzerland AG
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Filing: 1973-09-05
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Granted: 1974-11-19
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Expires: 1993-09-05
Abstract
Abstract A die for metal shaping operations such as impact drawing comprises, held in at least one collar, a working ring inside a stress ring and having a smaller radial cross-section than the stress ring. The modulus of elasticity of the working ring is greater than that of the stress ring which is in turn greater than that of tempered steel. The stress ring can be of a calcinated or cast metal carbide and a layer of ductile material may be interposed between the working and stress rings, or between the stress ring and a collar, or both.
Inventors
- 👤 J Hardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:02
CPC Classifications
B; B21; B21J; B21J13/00; B21J13/02; B21C; B21C25/00; B21C3/00; B21D; B21D37/00; B21D37/02; B21D37/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A die for metal shaping operations in general and impact drawing in particular comprising a working ring of metal carbide, a coaxial stress ring of metal carbide closely surrounding and radially supporting said working ring and a coaxial steel collar closely surrounding and radially supporting said stress ring, the radial thickness of said working ring being less than that of said stress ring, the modulus of elasticity of said working ring being greater than that of said stress ring and the modulus of elasticity of said stress ring being greater than that of said collar.
Claim 2
Dependent Claim
95 words
A die for metal shaping operations in general and impact drawing in particular comprising a working ring of metal carbide, a coaxial stress ring of metal carbide closely surrounding and radially supporting said working ring and a coaxial steel collar closely surrounding and radially supporting said stress ring, the radial thickness of said working ring being less than that of said stress ring, the modulus of elasticity of said working ring being greater than that of said stress ring and the modulus of elasticity of said stress ring being greater than that of said collar.
Claim 3
Dependent Claim
94 words
A die according to claim 1, in which the thickness of the working ring is at most equal to the product of the ratio E2 sigma 1/E1 sigma 2 multiplied by the thickness of the stress ring, where E1 is the modulus of elasticity of the working ring, E2 is the modulus of elasticity of the stress ring, sigma 1 is the resistance of the working ring to alternating flexural loads and sigma 2 is the resistance of the stress ring to alternating flexural loads, and where sigma 2 is greater than sigma 1.
Claim 4
Dependent Claim
43 words
A die according to claim 1, in which at least one of the interengaging surfaces of the working ring and the stress ring is cladded with a layer of ductile and easily machined material to provide a more perfect contact between said rings.
Claim 5
Dependent Claim
38 words
A die according to claim 1, in which the working ring has a modulus of elasticity of between 30,000 and 65,000 kg/mm2 and the stress ring has a modulus of elasticity of between 28,000 and 55, 000 kg/mm2.
Claim 6
Dependent Claim
93 words
A die according to claim 4, in which thickness of the working ring is at most equal to the product of the ratio E2 sigma 1/E1 sigma 2 multiplied by the thickness of the stress ring, where E1 is the modulus of elasticity of the working ring, E2 is the modulus of elasticity of the stress ring, sigma 1 is the resistance of the working ring to alternating flexural loads and sigma 2 is the resistance of the stress ring to alternating flexural loads, and where sigma 2 is greater than sigma 1.
Claim 7
Dependent Claim
44 words
A die according to claim 4, in which the working ring has a resistance to alternating flexural loads of approximately 46 kg/mm2 for 106 cycles and the stress ring has a resistance to alternating flexural loads of at least 50 kg/mm2 for 106 cycles.
Claim 8
Dependent Claim
15 words
A die according to claim 4, in which the working ring is calcinated metal carbide.
Claim 9
Dependent Claim
15 words
A die according to claim 7, in which the stress ring is cast metal carbide.
Claim 10
Dependent Claim
102 words
A die for metal shaping operationS in general and impact drawing in particular comprising a working ring, a coaxial stress ring closely surrounding and radially supporting the working ring and a coaxial steel collar closely surrounding and radially supporting the stress ring, the radial thickness of the working ring being less than that of the stress ring, the modulus of elasticity of the working ring is greater than that of the stress ring, the modulus of elasticity of the working ring is between 30,000 and 65,000 kg/mm2 and the modulus of elasticity of the stress ring is between 28,000 and 55,000 kg/mm2.
Claim 11
Dependent Claim
102 words
A die for metal shaping operationS in general and impact drawing in particular comprising a working ring, a coaxial stress ring closely surrounding and radially supporting the working ring and a coaxial steel collar closely surrounding and radially supporting the stress ring, the radial thickness of the working ring being less than that of the stress ring, the modulus of elasticity of the working ring is greater than that of the stress ring, the modulus of elasticity of the working ring is between 30,000 and 65,000 kg/mm2 and the modulus of elasticity of the stress ring is between 28,000 and 55,000 kg/mm2.
Claim 12
Dependent Claim
94 words
A die according to claim 9, in which the thickness of the working ring is at most equal to the product of the relation E2 sigma 1/E1 sigma 2 multiplied by the thickness of the stress ring where E1 is the modulus of elasticity of the working ring, E2 is the modulus of elasticity of the stress ring, sigma 1 is the resistance of the working ring to alternating flexural loads and sigma 2 is the resistance of the stress ring to alternating flexural loads, and where sigma 2 is greater than sigma 1.
Claim 13
Dependent Claim
21 words
A die according to claim 9, comprising a layer of ductile material interposed between the working ring and the stress ring.
Claim 14
Dependent Claim
44 words
A die according to claim 9, in which the working ring has a resistance to alternating flexural loads of approximately 46 kg/mm2 for 106 cycles and the stress ring has a resistance to alternating flexural loads of at least 10 kg/mm2 for 106 cycles.
References Cited (Backward Citations)
US3628370A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |