The Development On CAD/CAPP System Of The Spur Cylindric Gear Of Involute In 457 Rear Bridge Of Automobile

With the developing of modernize of industry at top speed,the automobile's market is getting stronger day by day,so that the function and structure of product and the cycle of the renew and replace of product are forced to getting better.Design is the soul of the product.So that,we must accept the modernize method of design; spread and apply the CAD/CAPP technology;improve the ability of innovation on product to accord with requirement of society's development.This thesis is based on research about the CAD/CAPP technology.On the basis of basic design theory of spur cylindric gear of involute, the system is developed in VB language on the AutoCAD 2004 platform.This system can be divided into two sub-systems:gear CAD system, gear CAPP system.According to the design conditions decided by the designer and the inputted parameter,with a good interface of man-machine conversation, the CAD system can do some design of the structure dimension of the gear. At the same time the designed parameter can be corrected when it is necessarily.After that the designed parameter from the system can automatically be transmitted so that the gear fitting parts drawings could be drawn.This may upgrade the designing quality of the gear and the efficiency of the gear drawing.In addition,the CAD system includes some more utility modules,such as module of gear calculation of error of gear profile, module of gear measurement, module of looking up nation standard of gear.According to the design route of the spur cylindric gear's process,this system can be divided into 2 modules :the module of the information inputting of spur cylindric gear part ,the module of the process parameters design.In this system ,the geometry model of spur cylindric gear part can be created according to the information from the module of the information inputting ;then,the process parameters can be calculated or determined based on geometry model and CAPP function;At the same time,the technological documentation for production which will be printed can be created as well so as to direct practice.