Research On CAD System For Automatic Bicycle Assembly

Bicycle manufacturing enterprises face great problems in designing and management under pressure of bicycle configurations diversification and customers'individualized requirements. Regulating designing method, promoting creativity and improving designing efficiency to cater for market demand fleetly has been a key problem for enterprises'development. Applying designing experience and criterions to bicycle CAD system to solve key problems such as bicycle-frame designing, parts management and automatic assembly and provide top-quality products for customers have been bicycle enterprises'urgent affairs.Based on investigation into application actuality of CAD systems and manufacturing problems in bicycle enterprises, this thesis analyzes key problems in bicycle CAD systems like assembly and management of parts systematically and provides corresponding solutions for them. On the basis of analyzing advanced designing techniques inland and abroad, this thesis established a UG based CAD system for bicycle automatic assembly, and the system includes open-architecture 3D parts database, parts database editing tools and automatic assembly modules. Key theories and technologies applied in the system such as parameterized modeling of 3D parts, establishing of open-architecture database, dynamic adding and off-line edition of parts, assembly interface model and automatic matching algorithm, automatic assembly of parts and assembly rationality inspection are expounded in this thesis.The system regulated bicycle-designing flow and actualized many key functions like dynamic expansion of parts database, off-line edition of parts, automatic assembly of parts and rationality inspection of assembly. Application of the system improved efficiency and reliability of parts automatic assembly in bicycle designing and promoted enterprises'designing ability and informationization level. Development methods and flow of the system can also be references for congeneric solutions.