Coordinate measuring machines are widely used in modern manufacturing as one of the most powerful measurement instruments to ensure high-quality mechanical products. However, a computer-aided inspection planning system would improve inspection effectiveness and reduce costs. The system aims to automate the several steps involved in dimensional inspection planning: interpret a part design (geometry and tolerance specifications), select inspection devices and sensors, define detailed inspection sequence, and generate numerical control code for the machine. Touch-probe selection is a critical decisional step. Reasoning on geometrical constraints, an automatic system has to define orientation, and structure and dimensions of the touch probe most suitable to inspect a part. To determine geometrical constraints, it is necessary to reason on the solid model of the part. An approach based on form features extracted from the solid model is possible. In the present work, we define a taxonomy of form features to solve inspection problems, and discuss implementation of a graphical user interface that selects form features from a boundary solid model of a part. The system, based on C++ object-oriented programming and ACIS Geometric Modeler, deals with nonrotational parts. It is also equipped with a feature verification module to control human selection.

Form-feature selection in Computer-Aided Inspection Planning

POLINI, Wilma;
1998

Abstract

Coordinate measuring machines are widely used in modern manufacturing as one of the most powerful measurement instruments to ensure high-quality mechanical products. However, a computer-aided inspection planning system would improve inspection effectiveness and reduce costs. The system aims to automate the several steps involved in dimensional inspection planning: interpret a part design (geometry and tolerance specifications), select inspection devices and sensors, define detailed inspection sequence, and generate numerical control code for the machine. Touch-probe selection is a critical decisional step. Reasoning on geometrical constraints, an automatic system has to define orientation, and structure and dimensions of the touch probe most suitable to inspect a part. To determine geometrical constraints, it is necessary to reason on the solid model of the part. An approach based on form features extracted from the solid model is possible. In the present work, we define a taxonomy of form features to solve inspection problems, and discuss implementation of a graphical user interface that selects form features from a boundary solid model of a part. The system, based on C++ object-oriented programming and ACIS Geometric Modeler, deals with nonrotational parts. It is also equipped with a feature verification module to control human selection.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11580/7579
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