US3628370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Die assembly
Assignee: Carmet Co
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Filing: 1969-10-08
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Granted: 1971-12-21
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Expires: 1989-10-08
Abstract
Abstract A die assembly for use in forming operations such as hot extruding wherein the forming insert is frustoconical in shape and is cold-pressed into a sleeved support casing with the major base facing the exit side of the assembly and is supported under axial load by a backer bushing affixed to the support casing.
Inventors
- 👤 William H Phillips Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:26
CPC Classifications
B; B21; B21C; B21C25/00; B21C25/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
201 words
A die assembly for use in extrusion operations comprising a ceramic die body having a sloping outer peripheral surface defining a frustum which has a major base at one end of larger area than a minor base at its other end, the material to be extruded being forced against said minor base, a die opening extending axially through said die body, a metallic sleeve surrounding and in compressive engagement with said die body and having a sloping inner peripheral surface complementary to the sloping outer surface of the die body, said sleeve having a sloping outer peripheral surface which slopes in the same direction as its inner peripheral surface such that the radial thickness of said sleeve is essentially constant along its axial length, the end surface of said sleeve of larger diameter being essentially coplanar with said major base of the die body, casing means having a bore therethrough with a sloping peripheral surface which receives said sleeve and die body, and backer bushing means in engagement with said major base of the die body and said larger-diameter end surface of the sleeve for supporting the sleeve and die body against the axial forces induced thereon during an extrusion operation.
Claim 2
Dependent Claim
201 words
A die assembly for use in extrusion operations comprising a ceramic die body having a sloping outer peripheral surface defining a frustum which has a major base at one end of larger area than a minor base at its other end, the material to be extruded being forced against said minor base, a die opening extending axially through said die body, a metallic sleeve surrounding and in compressive engagement with said die body and having a sloping inner peripheral surface complementary to the sloping outer surface of the die body, said sleeve having a sloping outer peripheral surface which slopes in the same direction as its inner peripheral surface such that the radial thickness of said sleeve is essentially constant along its axial length, the end surface of said sleeve of larger diameter being essentially coplanar with said major base of the die body, casing means having a bore therethrough with a sloping peripheral surface which receives said sleeve and die body, and backer bushing means in engagement with said major base of the die body and said larger-diameter end surface of the sleeve for supporting the sleeve and die body against the axial forces induced thereon during an extrusion operation.
Claim 3
Dependent Claim
12 words
The die assembly of claim 1 wherein said die body is frustoconical.
Claim 4
Dependent Claim
39 words
The die assembly of claim 2 wherein the slope of the peripheral surface of said bore in the casing means is equal to the slope of the die body and the slope of the peripheral surfaces of said sleeve.
Claim 5
Dependent Claim
29 words
The die assembly of claim 3 wherein said die body is interference fit in said sleeve at least 0.004 inch per inch of the outside diameter of said insert.
Claim 6
Dependent Claim
52 words
The die assembly of claim 1 wherein said sleeve is mounted into the casing means with sufficient interference fit to withstand the tangential tensile stresses induced by the die body and of sufficient compression to counteract the difference in coefficients of expansion of the die body, the sleeve and the casing means.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |