Denso Corporation

Yasushi Miyamura

Tomio Sugiyama

Satoru Yamaguchi

Hiromi Katou

Kazuo Matsubara

Hiromi Inada

Kouji Hori

In a method of detecting defects generated in a honeycomb structural body, both end sections of the honeycomb structural body is sealed along a flowing direction of exhaust gas. Air is supplied in the flowing direction of the exhaust gas from one end section to the other end section of the honeycomb structural body. Microphones are arranged at outer periphery of the honeycomb structural body and detect sounds of air leaking from a skin layer of the honeycomb structural body. A judgment step judges whether or not defects such as holes having not less than a predetermined diameter and cracks are generated on the basis of a magnitude of the detected sounds of the leaking air.

Method of detecting defects in honeycomb structural body

A method of holding a dried honeycomb structure, which is a honeycomb structure after a drying process and before a firing process, when a ceramic honeycomb structure in which bulkheads forming a number of cells are disposed in the form of a honeycomb is manufactured with a manufacturing method including a extruding process, the drying process, and the firing process. A chuckhaving a plurality of clawsis used and the plurality of clawsare allowed to come into contact with an outer peripheryof the dried honeycomb structureso that the direction of the pressure F applied to the dried honeycomb structureby the claws is substantially parallel with the bulkheads.

Method of holding a dried honeycomb structure

Growing community of inventors

Mie-ken, Japan

Yasushi Miyamura