초록 ▼

A ceramic catalytic converter is made by first creating an electrode by cutting space apart holes through an electrode block, threading an electrode wire through each hole in the block and performing wire cutting electrical discharge machining to form a cutting surface with a plurality of cell walls

A ceramic catalytic converter is made by first creating an electrode by cutting space apart holes through an electrode block, threading an electrode wire through each hole in the block and performing wire cutting electrical discharge machining to form a cutting surface with a plurality of cell walls converging at rounded corners. The electrode is used to cut an extrusion die, a feedhole is provided in the die (preferably connected to a corner of the cell), and ceramic material is extruded through the extrusion die to form an extruded substrate having a plurality of open cells defined by adjacent walls converging in a rounded corner to form the ceramic catalytic converter. The rounded corner cell walls allows a more uniform deposit of washcoat and precious metals and reduces the amount of precious metals necessary in the ceramic catalytic converter.

대표청구항 ▼

[ What is claimed is:] [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;mo

[ What is claimed is:] [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.