Kurgu Planlama ve Modüler Aparat Tasarımında Unsur Kullanımı (pdf)

iiABSTRACTThe purpose of this research is to develop a system and a methodology thatallows the integration of product design with process planning. The task is achievedthrough an integrated CAD - set-up planning - fixture planning. The system consist ofthree major modules, namely, feature extraction and recognition, set-up planning andfixture planning. These modules are linked to a commercial CAD software.The manufacturing information of a part required for set-up and fixture planningis extracted from the 3D geometric model, thereby both geometric and non-geometricattributes of a part can be obtained. Some of the features are extracted and the others arerecognized from a feature based model of a part. Tolerance and geometric relationshipsbetween manufacturing features are taken into account in order to obtain the sequence offeatures using precedence matrix algorithm.Tool approach directions of features are used to group of features into set-ups.An optimisation approach is developed to find the optimal plans from all the feasiblefeature sequences. The criteria used is the minimum number of set-ups.Fixture planning is an important part of CAPP which is the link between designand manufacturing in a CIM environment. Rules are defined for support, locator andclamp placement based on these and a number of other commonly accepted machiningpractices. Fixture configuration are produced for every set-up using modular fixtureelements. In order to verify the fixture configurations, machining operations aresimulated on a finite element model. The model is analyzed respect to tool movementand chip removal. The proposed analysis model determines the clamping forces requiredto maintain the equilibrium of the workpiece during the process of machining.Keywords: feature-based model, manufacturing features, feature extraction, set-up planning,fixture, fixturing, computer aided fixture planning, automatic fixture configuration,dynamic analyis of fixtures.