artificial intelligence;  computer-aided design;  prototypes;  Design Law

The prototype-based design method is studied, and considering the complexity of mechanical design, a five-tuple expression model of prototype is proposed, namely prototype mockup, attributes, joiners, transformation rules, and prototype flags. Graphic elements are introduced into the model, so that the expression of the prototype contains a wealth of information; The prototype-based design process is proposed, that is, starting from a simple design goal, through the design requirements decomposer, the information about the constraints of the design target is output to the design prototype inference machine 1, the prototype inference machine 1 selects the appropriate design prototype from the prototype library, and translates it into a prototype drawing, and sends it to the prototype inference machine 2, and the prototype inference machine 2 evaluates the refined prototype cases, makes necessary improvements and modifications, and produces design results. In this way, the design is carried out layer by layer, and the amount of information transmitted is increasing, which solves the problem of intelligent CAD technology