DIE FOR EXTRUSION MOLDING, PRODUCTION METHOD FOR DIE FOR EXTRUSION MOLDING, AND PRODUCTION METHOD FOR HONEYCOMB STRUCTURE

摘要

The die for extrusion molding of the present invention includes: a first face; a second face formed opposite the first face; a raw material supply section with a first through hole that extends from the first face toward the second face; and a molding section with a second through hole that extends from the second face toward the first face so as to communicate with the first through hole, wherein the die is obtainable through the steps of: machining a material of the die to form the material into a predetermined shape and to form a machining-affected layer on the inner wall surface of the second through hole in the molding section; forming an oxidized layer by heating the machining-affected layer to oxidize the layer so as to convert the machining-affected layer into an oxidized layer; removing the oxidized layer so that a treated surface is formed; and nitriding the treated surface by ion implantation to form a nitride layer.