(1) subtractive design molding method: applicable to the design and production of simple small product models, in fact, it is to take the omission, cutting, etc., in one or a few of the basic geometric form of the design and processing, so as to obtain the shape of the new geometry. This type of design can be easily molded clay, oil clay, gypsum, rigid foam and other materials, manual methods of cutting, sculpture, filing, planing, scraping molding.
(2) additive design molding method: this type of model design and production of medium-sized products, such as washing machines, refrigerators, air conditioners, motors, machine tools and so on. Additive molding is a block method of some of the basic shape of the geometry of the block to take the stacking collocation to become a new modeling entity. More polyethylene resin plastic profiles, but also can be used wood, turn soil, oil clay, plaster, rigid foam to produce.
(3) mixed design molding method: a comprehensive design molding method, through the addition, subtraction or a variety of molding of the combination, complementary to the completion of the larger product model. Such as large machine tools, automobiles, ships, missiles, airplanes, satellites and so on. Generally appropriate to use wood, plastic profiles, metal alloy materials as the main material production.