1. Steel factor of round blade            Steel is the decisive factor of the quality of the mold, the choice of reasonable steel is the top priority, which is why some precision molds focus on the use of cemented carbide materials. The criteria for selecting steel are:            Requirements for injection molding materials            Different steels should be selected for different plastics, such as high polishing requirements, corrosion resistance requirements, etc;            Price            Considering the cost factor of the die, the material corresponding to the die life should be selected to avoid waste; the service life of P20 material is generally around 300000; 2738 material is no problem at 500000, H13 / 2344 is usually more than 800000, the use of cemented carbide material can be selected according to the situation;            surface treatment            Die surface treatment is also very important. Nitriding can enhance the surface hardness of steel and effectively prolong the life of the die; electroplating can effectively modify the die steel; for some plastic parts which need high brightness and corrosion resistance, electroplating can be used to enhance and improve the properties of steel.            2. Structural design factors            The mature mold structure not only takes into account the product material properties, shrinkage, molding temperature, elastic tensile deformation coefficient, but also takes into account the cooling water path and the speed of opening and closing the mold. Reasonable die structure can effectively prolong the die life and ensure the smooth production of the mold, improve efficiency and reduce cost.            3. Mold processing factors            Sharp tools make good work. The reasonable process arrangement can speed up the production cycle, shorten the processing time and effectively save the cost. And more importantly, reasonable processing can ensure the stability of the mold in the production process and prolong its life. Some processing errors will lead to mold welding, no matter how good the welding is, it is a kind of loss to the mold; in addition, poor processing may affect the mold action, reduce the mold life, and cause the mold to crack or even break in the production process. For the production and processing of cemented carbide mold, a rigorous and pragmatic attitude is especially needed to ensure every process detail            4. Standard parts            Although the standard parts of mold do not directly participate in the molding, they control the operation of the whole mold. Good standard parts should be wear-resistant, hard enough, high precision, not deformation. Especially under the requirement of service life, the standard parts such as tungsten steel punching needle play a key role in improving the quality of the die itself