If the mold unit value is high, it will be included in the fixed assets account, and the "production tool mold" can be set in the level 2 account. The main reason for manufacturing rapid tooling is to test and verify the components in the prototype development stage of new product development. Although other hand board manufacturing processes such as 3D printing, CNC or replica can usually achieve faster and cheaper hand boards, fast tools can also be used to test production parameters.

In this way, engineers and designers can get many loopholes that have not been noticed before, and implement redesign or other measures to prevent problems in parts. There are many other reasons for choosing rapid tooling. All industrial developed countries attach great importance to the development of mold manufacturing industry, not only because the mold industry accounts for a high proportion in the machinery industry of various countries, but also because the mold industry provides important processing tools and technical support for the development and application of new technologies and new products.

Therefore, t * is the relaxation time, which decreases with the increase of temperature. η The viscosity decreases with the increase of temperature. Using the temperature dependence of the relaxation time of polymer delaying high elastic deformation, the polymer semi-finished products (tubes, hollow profiles, etc.) are rapidly deformed near TF above the polymer glass transition temperature, and then remain deformed.

The shape stability of Dalian hollow molding product is better. Compressed air is introduced into one end of the pipe, and micropores are opened on the pipe wall at the other end. The parison of injection molding is usually taken out after cooling, reheated above Tg before blow molding, quickly moved into the mold, and blown with compressed air. The parison expands, separates from the metal pipe and adheres to the mold wall for molding and cooling.

Dalian hollow molding