US 12,436,074 B2
Method for searching for statistics correlated with strength of pillar-shaped honeycomb formed body after firing, and method for predicting whether or not pillar-shaped honeycomb formed body after firing having predetermined design specifications can be obtained
Shota Uno, Nagoya (JP); and Hiroshi Ninomiya, Nagoya (JP)
Assigned to NGK INSULATORS, LTD., Nagoya (JP)
Filed by NGK Insulators, Ltd., Nagoya (JP)
Filed on Dec. 19, 2022, as Appl. No. 18/067,814.
Claims priority of application No. 2022-019081 (JP), filed on Feb. 9, 2022.
Prior Publication US 2023/0251172 A1, Aug. 10, 2023
Int. Cl. G01N 33/38 (2006.01); G01N 3/00 (2006.01); G01N 3/06 (2006.01); G01N 3/62 (2006.01)
CPC G01N 3/62 (2013.01) [G01N 3/068 (2013.01); G01N 2203/021 (2013.01); G01N 2203/0266 (2013.01); G01N 2203/0647 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for searching for statistics correlated with a strength of a pillar-shaped honeycomb formed body after firing having predetermined design specifications, the pillar-shaped honeycomb formed body comprising a pillar-shaped honeycomb structure portion having an outer peripheral side wall and partition walls disposed on an inner peripheral side of the outer peripheral side wall and partitioning a plurality of polygonal cells forming flow paths from a first end surface to a second end surface, the method comprising:
a step A of preparing a plurality of pillar-shaped honeycomb formed bodies before firing for preparing pillar-shaped honeycomb formed bodies after firing having predetermined design specifications;
for each of the plurality of pillar-shaped honeycomb formed bodies before firing prepared in the step A, a step B of measuring two or more parameters, which are measurable by observing at least one of the first end surface or the second end surface, for 90% or more of the polygonal cells excluding partial cells at the outermost periphery, and calculating two or more statistics for each parameter measured;
a step C of firing each of the plurality of pillar-shaped honeycomb formed bodies before firing prepared in the step A under predetermined conditions to prepare a plurality of pillar-shaped honeycomb formed bodies after firing;
a step D of evaluating a correlation between the two or more statistics calculated in the step B for each parameter and the strength of the plurality of pillar-shaped honeycomb formed bodies after firing prepared in the step C; and
a step E of determining a statistic having the highest correlation with the strength of the pillar-shaped honeycomb formed bodies after firing having the predetermined design specifications from among the two or more statistics based on a result of the step D.