Method of analyzing factors affecting product quality and adjusting molding conditions for injection molding machine

摘要

A method of analyzing factors affecting the product quality performs adjustment of molding conditions for an injection molding machine. Data effective to discriminate the product quality is properly selected, and molding conditions for eliminating a molding abnormality are easily determined for an appropriate adjustment of the molding conditions. First and second principal component axes are defined by obtaining correlation coefficients indicating correlations of variations of plural conditions related to an injection molding operation, and performing a principal component analysis. Points representing dispersion of various conditions with respect to each principal component axis, are plotted on a rectangular coordinate system. The characteristic of variation tendency of data of the various conditions is synthetically evaluated on the basis of the first and second principal components which are most affecting the variation of data of the various conditions. The selection of the detected data for discriminating the product quality and the molding conditions to be adjusted is made easy, so that the discrimination of the product quality and adjustment of the molding conditions are simplified.