Patent US3740990A successfully refreshed from Google Patents.
US3740990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawing die assembly with integral cooling system in die housing
Assignee: Institut Metallurgii Zeleza Imeni
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Filing: 1971-02-16
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Granted: 1973-06-26
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Expires: 1991-02-16
Abstract
Abstract A pressure drawing die designed for drawing wires, rods and tubes made of materials having varied mechanical properties, whereby use is made of the effect of hydrodynamic friction. The drawing die incorporates a system of dies with a pressure sleeve with hydrodynamic action. A cooling system is built into the drawing-die body or housing. The inlet portion of the pressure sleeve extends outside the body through the orifice in a pressure nut. Between dies a seal in a form of labyrinths and metal powders is provided. The working dies are provided with metal jackets which separate the die core from the pressure mounting.
Inventors
- 👤 S Piaskowski
- 👤 A Godyn
- 👤 I Lacheta
- 👤 A Szczepanik
- 👤 E Zglobicki
- 👤 R Lyzwinski
- 👤 T Prajsnar
- 👤 J Rulinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:23
CPC Classifications
B; B21; B21C; B21C3/00; B21C3/02; B21C3/12; B21C3/14
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
177 words
A drawing die comprising a housing formed with a unitary tubular housing body provided integrally with an axially extending annular coolant channel, and means for passing a fluid through said channel to cool the interior wall of said housing body; a pair of dies axially aligned along said housing body and collectively cooled thereby, said channel axially spanning both said dies and at least partly surrounding same; a pressure sleeve ahead of said dies and axially aligned therewith, said pressure sleeve having an annular shoulder; a centering sleeve in contact with said wall and said dies and coaxially nested therewith for conducting heat between said body and said dies, said clamping sleeve and said wall having complementary tapers away from said shoulder; and a clamping nut threaded onto an end of said housing leading in the direction of drawing, said clamping nut having an axial orifice and bearing upon said shoulder in the direction of taper of said wall, said pressure sleeve having an axially extending portion traversing said orifice, said dies being in axially abutting engagement.
Claim 2
Dependent Claim
177 words
A drawing die comprising a housing formed with a unitary tubular housing body provided integrally with an axially extending annular coolant channel, and means for passing a fluid through said channel to cool the interior wall of said housing body; a pair of dies axially aligned along said housing body and collectively cooled thereby, said channel axially spanning both said dies and at least partly surrounding same; a pressure sleeve ahead of said dies and axially aligned therewith, said pressure sleeve having an annular shoulder; a centering sleeve in contact with said wall and said dies and coaxially nested therewith for conducting heat between said body and said dies, said clamping sleeve and said wall having complementary tapers away from said shoulder; and a clamping nut threaded onto an end of said housing leading in the direction of drawing, said clamping nut having an axial orifice and bearing upon said shoulder in the direction of taper of said wall, said pressure sleeve having an axially extending portion traversing said orifice, said dies being in axially abutting engagement.
Claim 3
Dependent Claim
19 words
The assembly defined in claim 1, further comprising a metal annular seal between said dies and said pressure sleeve.
Claim 4
Dependent Claim
14 words
The assembly defined in claim 2 wherein said seal is composed of metal powder.
Claim 5
Dependent Claim
51 words
The assembly defined in claim 1 wherein said housing includes a jacket surrounding said housing body and defining an annular compartment therein, respective ducts connected with said jacket for leading a cooling fluid to and removing the cooling fluid from said compartment, and a rib in said compartment partitioning the same.
Claim 6
Dependent Claim
64 words
The assembly defined in claim 4 wherein at least one of said dies has a sintered carbide body, a metal jacket surrounding and receiving said sintered carbide body, and a clamping sleeve receiving said metal jacket and said sintered carbide body within said housing body, the height of said metal jacket being between 1.0 and 1.4 times the height of said sintered carbide body.
Claim 7
Dependent Claim
18 words
The assembly defined in claim 5 wherein said dies and said pressure sleeve are formed with co-operating labyrinths.
Claim 8
Dependent Claim
20 words
The assembly defined in claim 6 wherein said sintered carbide body only has the die reduction angles and calibrating bore.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |