US4392397A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a drawing die
Assignee: US Philips Corp
•
Filing: 1980-06-19
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Granted: 1983-07-12
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Expires: 2000-06-19
Abstract
Abstract The disclosure relates to the manufacture of wire-drawing dies. The disclosure provides a method for securing a core in a metal housing. The method begins with the clamping of an annulus, consisting of a hardenable metal alloy, around a cylindrical core consisting of a material such as polycrystalline diamond or boron nitride. The core is clamped so as to produce a permanent, radially compressive stress therein. The core-annulus combination is secured in a metal housing of a conventional shape.
Inventors
- 👤 Adrianus R. C. Engelfriet
- 👤 Adriaan J. G. Op Het Veld
- 👤 Theodorus J. P. Van Vucht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:58
CPC Classifications
B; B21; B21C; B21C3/00; B21C3/02; B21C3/025; B21C3/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A method of producing a wire-drawing die comprising the steps of: providing a metal annulus having a bore; and clamping a core directly in the bore of the annulus, said core consisting of a hard, wear-resistant material; characterized in that: the annulus consists of a metal alloy which can be strengthened by a heat treatment; and the method further comprises the step of increasing the ulitmate strength of the annulus by a heat treatment, while clamping the core therein.
Claim 2
Independent Claim
79 words
A method of producing a wire-drawing die comprising the steps of: providing a metal annulus having a bore; and clamping a core directly in the bore of the annulus, said core consisting of a hard, wear-resistant material; characterized in that: the annulus consists of a metal alloy which can be strengthened by a heat treatment; and the method further comprises the step of increasing the ulitmate strength of the annulus by a heat treatment, while clamping the core therein.
Claim 3
Dependent Claim
28 words
A method of producing a wire-drawing die as claimed in claim 1, characterized in that the core consists of polycrystalline diamond, polycrystalline cubic boron nitride, or mixtures thereof.
Claim 4
Dependent Claim
24 words
A method of producing a wire-drawing die as claimed in claim 2, characterized in that the annulus consists of a precipitation hardenable copper alloy.
Claim 5
Dependent Claim
37 words
A method of producing a wire-drawing die as claimed in claim 3, characterized in that the method further comprises the steps of: securing the annulus in a metal housing; and cutting a drawing passage through the core.
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US2256912A
Cited
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US4129052A
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US4144739A
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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) | 1986-07-11 | 1987-01-10 | 1987-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-11 | 1991-01-10 | 1991-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-11 | 1995-01-10 | 1995-07-12 | $7700.00 | Window Closed / Lapsed |