Ngk Insulators, Inc.

Ngk Industries, Ltd.

Mitsuaki Watanabe

Satoru Inoue

Masayoshi Nakane

A method of inspecting a die having slits of narrow widths and a number of rear apertures communicating with the slits for forming honeycomb structures is able to inspect roughness distributions on inner surfaces of the rear apertures of the die. The method includes steps of irradiating diffused light beams onto an end face of the die on a side of the slits, detecting intensities of light beams arrived at an end face of the die on a side of the rear apertures by irregularly reflecting at inner surfaces of the rear apertures by the use of photosensitive device such as sensitized paper arranged at the end face of the die on the side of the rear apertures, and finally determining roughness distributions of the inner surfaces of the number of rear apertures with the aid of bright and dark portions on the photosensitive device.

Method of inspecting die for forming honeycomb structure

An extrusion-forming jig for extruding a ceramic batch to regulate a sectional shape and external dimensions of a honeycomb structure is formed by the extrusion. The jig includes electric discharge coating layers on surfaces of the jig contacting the ceramic batch. The electric discharge coating layers are made of a cemented carbide such as tungsten carbide. The jig is able to be used for many hours without necessitating replacement.

Growing community of inventors

Inazawa, Japan

Mitsuaki Watanabe