Study And Development On A CAD System For Refrigerating Heat-exchange Equipments Based On UG

Design method of heat-exchange equipments in thermal power system mainly depend on traditional experience and manual calculation. This old method could hardly meet the market need and the tendency of high efficiency and complication for its low efficiency and long period. This paper aims at solving the above problems, analyzes the characteristics of heat-exchange equipments and makes use of UG/Open API module to carry out the secondary development to NX software. A CAD system that runs through the whole design process of heat-exchange equipments is developed and the author is in charge of mechanical design module, virtual assembly module and resource management module.In mechanical design module, the parametric modeling method of the parts has been summarized. The method has been used to establish and control part templates with expressions to get the needed parts. By defining assembly constraint relations between parts the automatic assembly of refrigerating heat-exchanger has realized based on the new parts. Also, the expression and storage of the assembly constraint relations has been researched.In virtual assembly module, the static & dynamic interference and assembly sequence planning has been studied based on dynamic interference. The intention of static interference is to check the interference between the parametric parts when assembly. A dynamic interference method has been presented, which is based on boundary extrusion, turn the through many discrete points to simulate dynamic interference to continuous interference on movement locus, decrease the computation and improve the efficiency. The assembly sequence can obtained based on this method.In resource management module, the author completes the classified and management of complicated design data of parameters, templates and instances in the CAD system. Personalized interfaces have been made, through the interfaces to manage and search the data. This system ran successfully through testing in Dalian Refrigeration Company Limited. The running results indicate that this system could improve the design efficiency of heat-exchange equipments. Also the system has good practicability and conveniences. The company's design responding ability has been improved.