Patent US3952179A successfully refreshed from Google Patents.
US3952179A
Expired / Lapsed
US
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Rotary cutting die and method for its production
Assignee: Boeing North American Inc
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Filing: 1975-02-06
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Granted: 1976-04-20
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Expires: 1995-02-06
Abstract
Abstract An improved rotary cutting die and method of producing it are disclosed wherein a cylindrical die blank or support has a weld bead applied on its peripheral surface in a configuration corresponding to the design of the product to be formed. The weld bead is then ground to provide a working surface spaced a predetermined distance radially above the die blank surface whereupon the weld bead is electrical discharge machined to form the required cutting edges coincident with said working surface.
Inventors
- 👤 Kenneth Vincent Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:57
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/28; B23P15/40; B23P15/406; B23H; B23H9/00; B26; B26F; B26F1/00; B26F1/38; B26F1/44; B26F1/384; B26F2001/4472
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
The method of making a rotary cutting die for converting sheet material into die cut and creased products comprising the steps of: providing a die blank cylinder having a diameter less than a predetermined reference diameter, applying a weld bead to the peripheral surface of the die blank cylinder in a predetermined configuration to increase the effective diameter of the die blank cylinder beyond the reference diameter, removing a portion of the weld bead to form a uniform working surface thereon having a diameter equal to said reference diameter, and electrical discharge machining said weld bead to form a cutting edge coincident with said working surface.
Claim 2
Independent Claim
106 words
The method of making a rotary cutting die for converting sheet material into die cut and creased products comprising the steps of: providing a die blank cylinder having a diameter less than a predetermined reference diameter, applying a weld bead to the peripheral surface of the die blank cylinder in a predetermined configuration to increase the effective diameter of the die blank cylinder beyond the reference diameter, removing a portion of the weld bead to form a uniform working surface thereon having a diameter equal to said reference diameter, and electrical discharge machining said weld bead to form a cutting edge coincident with said working surface.
Claim 3
Dependent Claim
32 words
The method as set forth in claim 1, wherein the electrical discharge machining is preceded by the step of forming a negative electrode having a groove therein corresponding to said predetermined configuration.
Claim 4
Dependent Claim
58 words
The method as set forth in claim 1 wherein the electrical discharge machining consists of the steps of first electrical discharge machining the weld bead with a rough cut electrode to rapidly remove the excess weld bead material and then electrical discharge machining the weld bead a second time with a finishing electrode to form the cutting edge.
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) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |