GREEN HONEYCOMB MOLDING DEFECT EXAMINATION METHOD, GREEN HONEYCOMB STRUCTURE MANUFACTURING METHOD, AND GREEN HONEYCOMB MOLDING DEFECT EXAMINATION DEVICE

摘要

Disclosed is a method of examining defects in a green honeycomb molding having partition walls which form a plurality of flow channels extending in parallel with one another, and sealing portions which close the upper ends of some of the plurality of flow channels and the lower ends of the rest flow channels. The method includes a step of applying pressure to the lower ends of the plurality of flow channels using gas, and a step of visualizing the distribution of gas refractive indexes near the upper ends of the plurality of flow channels.

主权项

1. A method of examining defects in a green honeycomb molding having partition walls which form a plurality of flow channels extending in parallel with one another, and sealing portions which close one end of some of the plurality of flow channels and the other end of the rest of the plurality of flow channels, the method comprising:
a step of applying pressure to one end of the plurality of flow channels using gas; a step of acquiring a plurality of first direction images visualizing the distribution of refractive indexes of gas near the other end of the plurality of flow channels from a first direction intersecting the axis of the plurality of flow channels at different times; a step of acquiring a plurality of second direction images visualizing the distribution of refractive indexes of gas near the other end of the plurality of flow channels from a second direction intersecting the axis of the plurality of flow channels and intersecting the first direction at different times; a step of selecting an image having a largest number of jet flows of gas discharged from the other end of the plurality of flow channels of the green honeycomb molding in the plurality of first direction images; a step of selecting an image having a largest number of jet flows of gas discharged from the other end of the plurality of flow channels of the green honeycomb molding in the plurality of second direction images; and a step of acquiring information relating to the positions of the jet flows in the selected two images.