There are many types of plastic mold steels, and they are also very wide. From the price point of view, there are between ten yuan and several hundred yuan. There are imported and domestic ones, so their quality, characteristics and use environment are all Not the same, so the service life is very different. In addition, the plastic mold steel starts to calculate the service life when it starts to be produced after the mold is made. The mold manufacturing is put into use after the steps of design, processing, assembly, debugging, etc., so the design of the processing personnel in the mold processing process. The difference in level and manufacturing process, the service life of the mold will also be greatly affected. The following analysis of the factors affecting the service life of the injection mold.
Quality of mol steel
The decisive factor in the quality of steel, the choice of the right mold steel is the top priority. For example, different injection molding materials, the corresponding mold steel will not be the same, such as high polishing requirements, corrosion resistance requirements. In addition, the different quality of the place of production will be different. Generally, the life of the P20 die steel produced by the big factory is about 300,000 times, the 1.2738 die steel is about 500,000 times, and the H13 die steel and the 1.2344 die steel are usually one million times. Left and right, you can choose to use large or small steel materials according to the situation.
Steel surface treatment
The surface treatment of mold steel is also very important. Nitriding can enhance the surface hardness of steel and effectively extend the life of the mold. Electroplating can effectively modify the mold steel. For some plastic parts that require high brightness and corrosion resistance, they can be strengthened by electroplating. And improve the performance of steel.
Structural 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 passage, the speed of opening and closing the mold, and the like. Reasonable mold structure can effectively extend the life of the mold and ensure the smooth production of the mold. Improve efficiency and reduce costs.
Mold processing technology
If a worker wants to do something good, he must first sharpen his tools. The arrangement of plastic mold technology is particularly important. Reasonable process arrangement can speed up the production cycle, shorten the processing time and save costs. And more importantly, accurate and reasonable processing can ensure the stability and longevity of the mold during the production process. Some machining errors will lead to mold welding, no matter how good the welding is, it is a loss to the mold; in addition, poor processing may affect the mold movement, reduce the mold life, and cause the plastic mold to appear in the production process. Cracked or even broken.
The board that determines the capacity of the bucket is the shortest piece of wood. This is understood by everyone, but it is often not noticed when doing it. The mold is also the same. Although the standard parts of the mold parts are not directly involved in the molding, they control the operation of the whole mold. The standard parts with excellent quality should have the characteristics of being wear-resistant, hard enough, high precision and unsuitable for deformation.
Mold hot runner system
This actually has the least impact on the quality of the mold, because the hot runners are generally branded by customers, especially some large customers. Well-known foreign brands do very well in quality and after-sales service, so there is generally no problem in quality. However, some domestic hot runners have a very different quality. In order to save costs, individual small enterprises strive for price advantages, and with some unreliable heating and conduction accessories, problems are easy to occur. The main problem with cold runners is how to ensure the balance of injection molding, gate size, injection pressure and so on.
Anyone with experience in mold knows how important cooling is to a mold. Due to the increase in prices and labor wages, it is unthinkable to reduce the profit from the one-second injection cycle when mass-producing products. However, when the production cycle is accelerated, the temperature of the mold will rise. If it is not effectively controlled, the mold will be too hot to be formed, and even the mold deformation will be scrapped. Therefore, excellent waterway design is particularly important, including the arrangement density of waterways, diameters, links between each other, and so on.
Maintenance is one of the important factors in the service life of the mold, so every time the mold is used, it must be fully maintained, especially the rust prevention of the molded part, the rust prevention of the main action parts, and the mold is more or less due to the production process. Water will be exposed to the mold, especially during the installation or disassembly process. Therefore, the mold must be dried when the deactivation period is long. After cleaning the mold, it is necessary to brush the protective oil or anti-rust oil.
Simple plastic mold steel is set according to the use and grade and order requirements before refining. Regardless of the subsequent series processing and human factors, the theoretical service life of plastic mold steel is 250,000 to 800,000 times, medium plastic mold steel. 80 to 1 million times, good brand plastic mold steel and patent steel will exceed 150 molds, or even higher.