Claims
- 1. A method of making an electrode for cutting a catalytic converter substrate die comprising:
- cutting spaced apart holes through an electrode block with spaced apart cutting elements;
- threading an electrical discharge machining wire through each hole in the electrode block;
- moving the wire in a continuous path to cut an open cell through the block, said open cell defined by cell walls, wherein adjacent walls converge at a rounded corner and wherein the rounded corner has a thickness greater than either of the adjacent cell walls.
- 2. A method as set forth in claim 1 further comprising providing a border of electrode block material surrounding the electrode cell walls.
- 3. A method as set forth in claim 1 wherein said electrode block material comprises a copper-tungsten alloy.
- 4. A method as set forth in claim 1 wherein cutting elements comprise a carbide material.
- 5. A method as set forth in claim 1 wherein said cutting elements are tubular shaped.
- 6. A method as set forth in claim 4 wherein said cutting elements are tubular shaped.
- 7. A method of making a ceramic catalytic converter substrate comprising:
- providing an electrode having a cutting surface formed by a plurality of cell walls converging at rounded corners;
- cutting an extrusion grid in a die with said electrode surface;
- providing a feedhole in said die communicating with said grid in the die formed by the electrode surface;
- extruding a ceramic material through the feedhole and the grid of the extrusion die to form an extruded substrate having a plurality of open cells defined by adjacent walls converging in a rounded corner wherein the rounded corner has a thickness greater than either of the adjacent walls; and
- hardening the extruded substrate.
- 8. A method as set forth in claim 7 wherein each cell has a feedhole connected to a corner of the cell.
- 9. A method as set forth in claim 7 wherein the feedhole is connected to every other cell.
Parent Case Info
This is a division of application Ser. No. 08/573,778 filed on 18 Dec. 1995, pending.
US Referenced Citations (15)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2143445 |
Feb 1985 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
573778 |
Dec 1995 |
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