Method of manufacturing extrusion die for extruding honeycomb structural body
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United States of America Patent
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Mar 17, 1998
Grant Date -
N/A
app pub date -
Aug 8, 1996
filing date -
Aug 21, 1995
priority date (Note) -
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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.
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