2. The operating temperature of the three types of precision machining abrasives, cold work, plastic and hot work, is quite different from the operating temperature of the cemented carbide mold, so the heat resistance requirements of the original injection molding machine parts materials are quite different. 2. The product quality has high precision requirements and low roughness value requirements. The selected raw materials should ensure that the molds have good drilling, grinding and polishing characteristics in terms of ingredients and materials, and have good specifications after they are made into abrasive tools. Look reliability or high precision with low roughness values. 3. The material of the commodity is a metal composite material or a non-metallic material. For different raw materials, the deformation immunity and operating temperature are quite different, and the standards in the work of abrasive tools are quite different. Large, the selected mold material is very different. The key components of abrasive tools can be divided into working parts and auxiliary parts. The former one immediately touches the raw materials for production and processing, and the latter one is required to improve the performance of the raw materials. For example, the strength, wear resistance, heat resistance, etc. of the position (profile or blade) in the working position of the convex and cavity during operation are high; the non-working position of the mold manufacturing position can be moderately reduced, but a certain strong ductility must be ensured. For the auxiliary parts of the abrasive tool, including standard parts, guiding parts, etc., the materials can be selected according to their characteristics.