US4235583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion die and method for making same
Assignee: Motors Liquidation Co
•
Filing: 1978-03-23
•
Granted: 1980-11-25
•
Expires: 1998-03-23
Abstract
Abstract A method is provided for forming an extrusion die of the type used to form a ceramic monolith having thin walls defining a multiplicity of parallel tubular passageways with at least about 100 passageways per square inch, the die having a feed face and a discharge face, the feed face having a plurality of feed holes extending partially through said die and interconnecting with a network of grid slots in the discharge portion of said die formed by a plurality of grid pins which define the slot width and the wall thickness, shape and size of said passageways. The method involves the steps of forming the width of the slots larger than the desired wall thickness of the passageways, and metal plating the slot defining surfaces of the grid pins to obtain the slot width corresponding to the desired wall thickness. Plating is accomplished by the electroless plating technique using a metal selected from the group consisting of nickel, chromium, cobalt and cobalt-nickel. The resulting die has a substantially uniform coating of wear resistant metal which is strippable for replating and continued die use.
Inventors
- 👤 James R. Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:02
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/24; B23P15/243; B28; B28B; B28B3/00; B28B3/20; B28B3/26; B28B3/2663; B28B3/269; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/11; B29L; B29L2031/00; B29L2031/60; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/933; Y10S428/9335; Y10S428/936; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49888; Y10T29/4998; Y10T29/49982
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
In a method for forming an extrusion die of the type used to form a ceramic monolith having thin walls defining a multiplicity of parallel tubular passageways with at least about 100 passageways per square inch, said die having a feed face and a discharge face, said feed face having a plurality of feed holes extending partially through said die and interconnecting with a network of grid slots in the discharge portion of said die formed by a plurality of grid pins which define the said slot width and the wall thickness, shape and size of said passageways, the invention comprising the steps of forming the width of said slots larger than the desired wall thickness of said monolith passageways, and metal plating the slot defining surfaces of said grid pins to obtain the slot width corresponding to said desired wall thickness, said plating being accomplished by electroless plating of a metal selected from the group consisting of nickel, chromium, cobalt and cobalt-nickel, to form a substantially uniform coating having good wear resistance and being strippable for replating and continued die use.
Claim 2
Dependent Claim
182 words
In a method for forming an extrusion die of the type used to form a ceramic monolith having thin walls defining a multiplicity of parallel tubular passageways with at least about 100 passageways per square inch, said die having a feed face and a discharge face, said feed face having a plurality of feed holes extending partially through said die and interconnecting with a network of grid slots in the discharge portion of said die formed by a plurality of grid pins which define the said slot width and the wall thickness, shape and size of said passageways, the invention comprising the steps of forming the width of said slots larger than the desired wall thickness of said monolith passageways, and metal plating the slot defining surfaces of said grid pins to obtain the slot width corresponding to said desired wall thickness, said plating being accomplished by electroless plating of a metal selected from the group consisting of nickel, chromium, cobalt and cobalt-nickel, to form a substantially uniform coating having good wear resistance and being strippable for replating and continued die use.
Claim 3
Dependent Claim
13 words
In a method as set forth in claim 1, the metal being nickel.
Claim 4
Dependent Claim
20 words
In a method as set forth in claim 1, said plated slot width being as small as about 0.004 inches.
Claim 5
Dependent Claim
129 words
In a metal extrusion die for forming a thin wall ceramic monolith having at least 100 passageways per square inch, wherein said die is provided with a feed face and a discharge face, said feed face having a plurality of feed holes extending partially through said die and interconnecting with a network of grid slots in the discharge portion of said die formed by a plurality of closely spaced apart grid pins defining the slot width and the wall thickness, shape and size of said passageways, the improvement comprising the slot defining surfaces of said pins having a coating of an electroless plated metal selected from the group consisting of nickel, chromium, cobalt and cobalt-nickel, said coating being wear resistant and removable for enabling replating and continued die use.
Claim 6
Dependent Claim
129 words
In a metal extrusion die for forming a thin wall ceramic monolith having at least 100 passageways per square inch, wherein said die is provided with a feed face and a discharge face, said feed face having a plurality of feed holes extending partially through said die and interconnecting with a network of grid slots in the discharge portion of said die formed by a plurality of closely spaced apart grid pins defining the slot width and the wall thickness, shape and size of said passageways, the improvement comprising the slot defining surfaces of said pins having a coating of an electroless plated metal selected from the group consisting of nickel, chromium, cobalt and cobalt-nickel, said coating being wear resistant and removable for enabling replating and continued die use.
Claim 7
Dependent Claim
11 words
A die in accordance with claim 4, the metal being nickel.
Claim 8
Dependent Claim
17 words
A die in accordance with claim 4, the slot width being as small as about 0.004 inches.
References Cited (Backward Citations)
US1310509A
Cited
GB222190A
Cited
US1817680A
Cited
US1944758A
Cited
US2412698A
Cited
US2494970A
Cited
US2532283A
Cited
US2588421A
Cited
US2997783A
Cited
US2882759A
Cited
US3038420A
Cited
US3174183A
Cited
US3156950A
Cited
US3373751A
Cited
US3339588A
Cited
US3251316A
Cited
US3433049A
Cited
US3566642A
Cited
US3606665A
Cited
US3824196A
Cited
US3905743A
Cited
US3837783A
Cited
US3877272A
Cited
US3938925A
Cited
US4118456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |