Method of manufacturing extrusion die for extruding honeycomb st

Details Method of manufacturing extrusion die for extruding honeycomb st Method of manufacturing extrusion die for extruding honeycomb st

1996-08-08

1998-03-17

Valentine, Donald R.

Electrolysis: processes, compositions used therein, and methods

Electrolytic erosion of a workpiece for shape or surface...

205646, 205660, 205665, 205672, B23H 914, B23H 300

Patent

active

057282862

ABSTRACT:
A method of manufacturing an extrusion die for extruding a honeycomb structural body is disclosed. The extrusion die has a plurality of forming channels which have a shape in a traverse cross section corresponding to that of the honeycomb structural body and have a predetermined depth from a front side of the extrusion die toward a back side, and a plurality of opening holes for feeding raw materials which have a cylindrical shape extending independently from the back side toward the front side and are arranged at a cross portion and/or a straight portion of the forming channels in such a manner that each opening hole is opened and connected to the cross portion and/or straight portion of the forming channels. The method includes the steps of, inserting, into the cross portion of the forming channels, an electrode having a circular shape in a traverse cross section and a length corresponding to the depth of the forming channel, and performing an electrolytic machining by using the electrode so as to make a corner portion of a cell surrounded by the forming channels an arcuate shape in a traverse cross section.

REFERENCES:
patent: 5320721 (1994-06-01), Peters
patent: 5322599 (1994-06-01), Peters
patent: 5402692 (1995-04-01), Bennett
patent: 5507925 (1996-04-01), Brew

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