Study On Subdivision Application In Product With Complex Surface Design For Quality-controlling In Manufacture

To meet aesthetic requirements or functional requirements in design, product with complex surface could be applied in many industry fields, such as automobile, airplane, household appliances and so on. The gap between design model and machining model brings many troubles in fast, effective and precise transition process from design to manufacture. Design, machining and measurement of complex surface become keys to improve product quality. For many obvious advantages of subdivision in Computer Aided Design (CAD) field, such as arbitrary topology, continuity, flexible expression and fast calculation, features of complex surface could be kept in iteration till constructing rough machining model or fine machining model. The machining quality could be improved and the period from design to manufacture be reduced a lot. Study on subdivision application in product with complex surface design for quality-controlling in manufacture would promote developments in product with complex surface design industry.Main achievements and contributions in study were shown as follows:1. With advanced theories from CAD/CAM, based on the characteristics of intelligent Numerical Control (NC) machining, theory on complex surface design for quality-controlling in manufacture, transferred information about complex surface from design model to machining model by subdivision with re-mesh planning and iteration planning, built up an concept of design for quality-controlling.2. As for technologies for complex surface design for quality-controlling in manufacture, the keys are the transition algorithm from rough design surface to subdivision surface and the transition algorithm from subdivision surface to machining surface to solve problems, geometric features obtaining, controlling parameters selection and quality evaluation on subdivision surface, in re-mesh planning and iteration planning. The aim at fast and effective transition from complex surface design model to quality-required machining model was achieved.3,By self developed software for spiral bevel gear / product with complex surface design and machining by Visual C++ 6.0, stability and reliability of design for quality–controlling algorithm was proved.4,In design and machining of spiral bevel gear, the representation of product with complex surface, design for quality-controlling was taken to keep consistency and machinability of machining surface with design surface. The tooth construction algorithm, combined with geometric model and experience in shop, reduced the dependence on machining parameters input, enlarged product scale and types. The error compensation algorithm for five- axis and four–axis spiral bevel gear machining tools could guarantee the precision of machining tooth surface.