US 5,350,547 AGranted

Method of retrieving conditions for molding using expert system

AssigneeKabushiki Kaisha Komatsu Seisakusho

InventorsHiroyoshi Yamaguchi, Shuji Murai, Tatsuo Mimura

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Abstract

An expert system for retrieving molding conditions, in which a statistical technique is added to the functions of the conventional expert system, causes of defects are inferred from the records of countermeasures taken and inputted defect occurrence situation, conditions for temporary molding are obtained while repeating test molding, qualitative defects are extracted from defects occurred, a boundary of a region in which defects occur is determined with decision analysis of qualitative defects extracted with the use of the record of countermeasures as above, a condition for molding to eliminate the qualitative defects is determined on the basis of the boundary of region of defects occurrence, quantitative defects are extracted from defects occurred, and molding conditions for eliminating the quantitative defects are determined by performing analysis of variance depending on design of experiment with the quantitative defects extracted from the record of countermeasures, whereby the frequency of experiment is greatly reduced in executing statistical technique, countermeasures to a plurality of defects causing mutual actions are taken readily, and reliability of molding conditions to be obtained is increased.

Claims6

Dependent claims

A method of molding an article wherein molding conditions are determined using an expert system comprising:

a first process for inferring causes of a molding defect from countermeasure records and inputted defect occurrence situation data and for determining molding conditions through repetitive trial molding;
a second process for extracting qualitative defect data from the defect occurrence situation data, performing decision analysis over the extracted qualitative defects with use of the countermeasure records to determine a boundary of a defect occurrence region, and determining molding conditions for removal of the qualitative defects on the basis of the defect occurrence region boundary;
a third process of extracting quantitative defects from the defect occurrence situation data, executing analysis of variance based on design of experiments with respect to the extracted quantitative defects with use of the countermeasure records, and determining molding conditions for removal of the quantitative defects on the basis of the analysis of variance, the third process being performed after the completion of the second process;
and
molding an article using the molding conditions for removal of the qualitative defects determined in the second process and the molding conditions for removal of the quantitative defects determined in the third process.

2 more elements

Dependencies are inferred from the claim text.