Mold, known as the "mother of industry" title. It is mainly through the change of the physical state of the formed material to complete the processing of the object shape. Mold is not done well, the problems are all in these ten!
1. Die steel
Steel is the decisive factor of mold quality, and the most important thing is to choose a reasonable steel. The specifications for steel selection are:
① requirements for injection molding materials: different plastics should be made of different steels, such as the requirements for high polishing, corrosion resistance, etc;
② price - steel is good enough, not the more expensive the better; considering the cost elements of the mold, the mold steel should choose the materials corresponding to the mold life to avoid unnecessary waste; the life of ordinary P20 is about 300000; 2738 life is 500000, no problem, H13 / 2344 is generally more than 800000-1 million, which can be selected according to the situation;
③ heat treatment. The surface treatment of mold is also very important. Nitriding can strengthen the surface hardness of steel and extend the service life of die; electroplating can stop the modification of die steel. Electroplating can be applied to some plastic parts requiring high brightness and corrosion resistance to strengthen and improve the function of steel.
2. Structural design
The efficient mold structure not only considers the material characteristics of the product - shortening rate, molding temperature, elastic tensile deformation coefficient, but also considers the cooling water path, opening and closing speed, etc. Reasonable mold structure can extend mold life and ensure smooth production of mold, improve power and reduce cost.
3. Mold processing
Sharp tools make good work. The layout of mold technology is particularly important. Reasonable layout of technology can accelerate the production cycle, shorten the processing time, and save money. Moreover, more importantly, fine and reasonable processing can ensure the stability and extended life of the mold in the production process. Some processing 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 action, reduce the mold life, and cause the mold to crack or even break in the production process.
The capacity of the bucket is determined by the short root wood. We all know this truth, but when we do it, we often fail to notice it. The mould is the same. Although the standard parts are not directly involved in the forming, they control the operation of the whole mould. Good standard parts should be wear-resistant, hard enough, high precision and not be deformed. There is a big difference in the price of standard parts of different brands, so don't haggle over the price of making molds. Kill to kill, and your molds will drop to the public from gallop.
5. Collision (flying mold)
The experience of the die fitter, seemingly simple work, is the work with technical content.
This is the main focus of complex mold. The flat die is simple and the fractal surface only needs no flash and fracture difference. Like auto parts mold is very difficult, not only fractal surface is more irregular, and often contains a number of slider, top block.
Together, after the collision, it can also improve and perfect other problems of the mold, so it is a comprehensive operation.
6. Polishing / Dermatoglyphics
Mold polishing is an important part of mold manufacturing. Polishing is directly reflected on the plastic parts, so this is a very face-saving operation. Polishing can also play an auxiliary and supplementary role in mold movement, especially in demoulding. Often some mold production is not smooth, is due to the polishing is not in place, resistance is too large, difficult demoulding, and even top white, top crack and so on.
7. Mold installation
Mold installation is the same as assembly machine. Every part and screw can't make mistakes. Otherwise, the result will be quite serious. Light will lead to product defects, affect production, heavy will completely damage the mold, constitute scrap. Therefore, the installation work must be very meticulous.
During the installation process, especially pay attention to the cleaning of the mold, especially the waterways and screw holes. Be sure to blow the iron chips inside, otherwise the customer will be very angry.
8. Warm channel or cold channel
In fact, this has little impact on the quality of the mold, because the warm runner is generally requested by customers, especially some big customers. Foreign well-known brands, whether in quality or after-sales service, are very good, so the quality of the general will not be a problem, while some of the domestic warm runner is very different in quality. In order to save money and strive for price advantage, some small enterprises are prone to problems by using unreliable heating and conduction accessories.
The main problem of cold runner is how to ensure the injection balance, gate size, injection pressure and so on.
9. Cooling water circuit
People who have experience in mold know how important cooling is to a mold. Due to the increase of price and labor wage, the profit of every second of injection cycle reduction in mass production is unimaginable. However, the acceleration of production cycle will lead to the rise of mold temperature. If there is no useful control, the mold will be too hot to be formed, or even lead to mold deformation failure and scrap. Therefore, excellent water design is particularly important, including the layout density, diameter, connection between each other and so on.
10. Mold maintenance
Mold maintenance is mainly in the production process of maintenance and self-care.
Mold is like a car. If we don't use it for a long time and don't take care of it, it may lead to die scrapping. Therefore, every time the mold is used, we should stop taking care of it comprehensively, especially the rust prevention of forming parts and main action parts. Since the mold needs to be connected with water in the production process, there may be water on the mold during the installation or disassembly process, so it is necessary to ensure the monotony of the mold, and then brush a layer of oil for maintenance.
The above are the related contents of the top ten reasons why Jinan mold manufacturer failed to do a good job for you. To learn more, please visit the website: http://www.ok9868.com