1. Mould steel performance and quality
The decisive factor of steel quality, choosing the right mold steel is the top priority. For example, when the injection molding materials are different, the corresponding mold steel materials will not be the same, such as high polishing requirements, corrosion resistance requirements, etc.; plastic mold steel generally has a life of about 300,000 P20 mold steel, and 1.2738 mold steel 500,000 is no problem. , H13 die steel and 1.2344 die steel are usually above 800,000-1 million, which can be selected according to the situation. This is the top priority in determining the life of plastic molds.
2. Surface treatment of mold steel
The surface treatment of the mold steel is also very important. Nitriding can enhance the surface hardness of the steel and effectively extend the life of the mold; electroplating can effectively modify the mold steel, and some plastic parts that require high brightness and corrosion resistance can be enhanced by electroplating. And improve the performance of steel.
3. The structure design of the mold
The mature mold structure not only considers the product material properties, shrinkage rate, molding temperature, elastic tensile deformation coefficient, etc., but also considers the cooling water circuit and the speed of mold opening and closing. A reasonable mold structure can effectively extend the life of the mold and ensure the smooth production of the mold. Improve efficiency and reduce costs.
4. Mold processing and technology
If a worker wants to do well, he must first sharpen his tools. The arrangement of the plastic mold process is particularly important. A reasonable process arrangement can speed up the production cycle, shorten the processing time, and effectively save costs. And more importantly, accurate and reasonable processing can ensure the stability of the mold in the production process and prolong the life. Some processing errors will cause mold welding, no matter how good the welding is, it is a loss to the mold; in addition, poor processing may also affect the mold operation, reduce the mold life, and cause the plastic mold to pull during the production process. Crack or even break.
5. Standard parts
It is the shortest piece of wood that determines the capacity of the bucket. Everyone understands this principle, but it is often not noticed when doing it. The same is true for molds. Although standard parts are not directly involved in forming, they control the operation of the entire mold. Good standard parts should be wear-resistant, hard enough, high precision, and not suitable for deformation.
6. Butt bump or fly mold
The confrontation mainly relies on the experience of the mold fitter. The seemingly simple job is the most technical job. The main focus of complex molds is this effort. The flat mold is the simplest, as long as the fractal surface does not have flashing, it is basically fine. For example, auto parts molds are very troublesome, not only the fractal surface is relatively irregular, but also often includes multiple sliders and top blocks. At the same time, other problems of the mold can be improved and perfected through the collision. So it is a comprehensive job.
7. Polished or dermatoglyph
The polishing of the mold is the last link in the manufacture of the mold. Polishing is directly reflected on the plastic parts, so this is the most superficial work. Polishing can also help and supplement the action of the mold, especially for demolding. Often the production of some molds is not smooth because of improper lighting, excessive resistance, difficulty in demolding, and even whitening and cracking.
8. Plastic mold assembly
Mold assembly is just like assembling a machine. Every component and every screw cannot be wrong, otherwise the consequences will be very serious, from the slightest to the product defect, affecting the production, and the other to completely damaging the mold and causing scrap. Therefore, the assembly work must be very meticulous. During the assembly process, pay special attention to the cleaning of the mold, especially the waterway and screw holes. The iron filings must be blown out, otherwise the customer will be very angry.
9. Mold hot runner system
This actually has the least impact on mold quality, because hot runners are generally designated by customers, especially some large customers. Well-known foreign brands are very good in quality and after-sales service, so there is generally no problem in quality. It's just that the quality of some domestic hot runners is quite different. In order to save costs and strive for price advantages, individual small companies use unreliable heating and conduction accessories, which are prone to problems. The main problem of cold runner is how to ensure the balance of injection molding, gate size, injection pressure and so on.
10. Cooling water circuit
Anyone who has mold experience knows how important cooling is to a mold. Due to the increase in prices and human wages, when mass production of products, the profit brought by every second of the injection cycle is unimaginable. However, while accelerating the production cycle, the temperature of the mold will rise. If it is not effectively controlled, the mold will be too hot to form, and even cause the mold to deform and fail. Therefore, a good waterway design is particularly important, including the arrangement density, diameter, interconnection of the waterway, and so on.
11. Mold maintenance
Maintenance is one of the important factors in the service life of the mold, so every time the mold is used, a comprehensive maintenance must be carried out, especially the rust prevention of the forming part and the rust prevention of the main moving parts. The mold is more or less due to the production process. It will be exposed to water, especially water or sweat stains on the mold during installation or disassembly. Therefore, the mold must be dry when the shutdown period is long. After cleaning the mold, it must be brushed with protective oil or anti-rust oil.
