Secondary Development Of 3d Mechanical Cad System And Fan Design

With the rapid development of our country' s manufacturing and the promotion of application of CAD systems in various manufacturing fields,This require CAD technology can satisfy all kinds of users' requirement. But mainstream CAD softwares as commercial all-purpose flat, isn' t, good for idiographic speciality, can't satisfy the demand. Therefore, the question of Secondary development about CAD software become one of the tasks that we must settle for during the application of CAD systems. This accelerated CAD and Secondary development technology' s development.This thesis is based on the science and technology project of GANSU province - THE INTELLIGENT DATABASE SYSTEM OF MECHANICAL CAD. Some topic are discussed and researched.In the first place, the development of CAD technology, the application of CAD systems in manufacturing fields, the status of fan technology and the application of CAD systems in fan's design have been briefly introduced. The secondary development about mechanical CAD system that's technology foundation and meaning has been explained.Secondly, the hardware and the software demand about The secondary development and The fundamental must be followed during developing of software project have been introduced in detail. At the same time the reason that microcomputer and Solidworks system have been choosed as hardware and software flat has analyzed, And Visual C++6.0 has been choosed as development tool. Database technology has been used in the project.Thirdly, taked the the development of bearing standard library as a example, introduced at large the process of software development, and the keystone, the difficulty. Emphasized that how to input the data from database, how to protract 3-D graphics makeing use of the part's parameters. Be based fan' s similar theory, the same style and the different types, the fans' corresponding dimension is proportional, the fans' corresponding angle is equal. At first, we protract a fan as a model, when an other fan being designed, we can amend a little base on the model, the course of amend has been done by programme, this way is a new idea and flexible, the development is not very difficulty, it has very good applied value.Finally, Standard for the Exchange of Product Model Data(STEP)has been introduced and preliminary research, as the primarily direction of this question for discussion for the future.