Abstract
This paper proposes a method for analyzing geometrical characteristics, especially for improvement of manufacturing machining process. The definition of the geometrical characteristics in the GPS (Geometrical Product Specifications) standard defined as ISO 1101 are the value of difference from geometrically correct points, lines and planes as the datum, and it is aggregated property of multiple factors. This aggregated property of the geometrical characteristics is for conformity evaluation of the product functional requirement, and may not be appropriate to use for the improvement the manufacturing process. The geometrical characteristics have resolution structure and/or hierarchical structure. To elusive the causal mechanism and their relationship, and to use the causal mechanism for improvement of the manufacturing process, the geometrical characteristics should be resolved on their coordinate position, or should be observed the hierarchical structure. And as the first step, observation of the actual shape of the feature is also useful to analyze. Through the case study, this paper proposes the efficient procedure of process analysis of the geometrical characteristics.
