Mold manufacturing process is a complex process, from design, processing, assembly, commissioning and other steps, and finally to really put into use, in the whole life cycle, the main factors affecting the quality of the mold are the following ten aspects:
1. Mold steel
Several kinds of common steel
Steel is a decisive factor in the quality of the mold, choose a reasonable steel is the most important. The criteria for selecting steel are
① the requirements of the injection material - different plastics to use different steel, such as the requirements of high polish, corrosion resistance requirements, etc..
② price - steel performance is good, not the more expensive the better; taking into account the cost factors of the mold, mold steel should be used and mold life of the corresponding materials to avoid unnecessary waste; general P20 life of about 300,000; 2738, 500,000 no problem, H13/2344 usually in the 800,000-1,000,000 or more, you can choose according to the situation.
③ Heat treatment. The surface treatment of the mold is also very important. Nitriding - can enhance the surface hardness of steel, effectively extend the life of the mold; electroplating - can effectively modify the mold steel, for some need high brightness and corrosion-resistant plastic parts can use electroplating to enhance and improve the performance of steel
Structure design of pipe fittings
Mature mold structure not only takes into account the product material properties - shrinkage rate, molding temperature, elastic tensile deformation coefficient, etc., but also takes into account the cooling water circuit, the speed of opening and closing the mold, etc. A reasonable mold structure can effectively prolong the mold life and ensure the smooth production of the mold. Improve efficiency and reduce cost.
If you want to do a good job, you must first make a good tool. The arrangement of the mold process is especially important. A reasonable process arrangement can speed up the production cycle, shorten the processing time and effectively save the cost. And more importantly, accurate and reasonable processing can ensure the stability and extend the 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 also affect the mold action, reduce the mold life, resulting in the mold in the production process of pulling crack or even broken.
4. Standard parts
What determines the capacity of the bucket is the lowest one bar. We all understand this truth, but often do not notice when doing. The same goes for the mold. Although the standard parts are not directly involved in the molding, they control the operation of the whole mold. Good standard parts should be able to wear-resistant, hard enough, high precision, and should not be deformed. Different brands of standard parts price difference is very big, so do not just kill the price of the mold, kill to kill, your mold from Mercedes-Benz straight down to the public.
5. touch (flying mold)
The clash relies on the experience of mold pliers, seemingly simple work is the most technical work. Complex mold mainly depends on this kung fu. Flat mold is the most simple, fractal surface as long as there is no flying edge break difference basic on OK. Like auto parts mold is very troublesome, not only the fractal surface is more irregular, and often includes more than one slider, top block. At the same time, other problems of the mold can be improved and perfected through clashing. So it is a comprehensive work.
The polishing of the mold is the last part of the manufacture of the mold. Polishing reflects directly on the plastic parts, so it is a most face-saving work. Polishing can also help and complement the action of the mold, especially for the mold release is very meaningful. Often some mold production is not smooth is because the polishing is not in place, too much resistance, difficult to take off the mold, and even top white, top crack, etc..
7. Mold assembly
Mold assembly is like assembling a machine, each part, each screw can not be wrong, otherwise the consequences will be quite serious, the light will lead to product defects, affecting production, serious damage to the mold, resulting in scrap. So the assembly work must be very careful. Assembly process especially to pay attention to the clean work of the mold, especially the waterway, screw holes, must blow clean inside the iron chips, otherwise the customer is very angry.
8. Hot runner or cold runner
This actually has the least impact on the quality of the mold, because the hot runner is generally the brand specified by the customer, especially some large customers. Foreign well-known brands whether in the quality or after-sales service are very in place, so the quality of the general will not have problems. Just some of the domestic hot runner is a big difference in quality. Individual small enterprises in order to save costs, to fight for price advantages, with some unreliable heating and conduction accessories, it is easy to have problems. The main problem of cold runner is how to ensure the balance of injection, gate size, injection pressure and so on.
9. Cooling water circuit
Anyone who has experience in molds knows how important cooling is to a mold. Due to the increase of price and labor wage, when mass production of products, the profit brought by not reducing one second of injection cycle is unimaginable. But speed up the production cycle at the same time will be the rise of mold temperature, if not effectively controlled, it will make the mold too hot to mold, or even lead to mold deformation failure scrap. So the excellent waterway design is especially important, including the waterway layout density, diameter, the link between each other and so on.
Mold maintenance is mainly the maintenance and repair in the production process. Mold is just like a car, if it is not used for a long time and not maintained, it may lead to the scrapping of the mold. So every time after the use of the mold should be a comprehensive maintenance, especially the molding part of the rust prevention, the main action parts of the rust prevention. Because the mold has to receive water during the production process, there may be sleep on the mold during the installation or disassembly process, so make sure the mold is dry, and then brush a layer of oil to protect it.