Method of inspecting die for forming honeycomb structure

Details Method of inspecting die for forming honeycomb structure Method of inspecting die for forming honeycomb structure

1990-03-01

1991-01-29

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356237, 356241, G01N 2188

Patent

active

049888870

ABSTRACT:
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.

REFERENCES:
patent: 4145714 (1979-03-01), MacDonald et al.
patent: 4560273 (1985-12-01), Ando et al.
patent: 4806774 (1989-02-01), Lin et al.

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