Plastic injection mold polishing technology
Contents
1. What is plastic injection mold polishing technology?
2. Plastic injection mold polishing technology tool
What is plastic injection mold polishing technology?
Plastic injection mold polishing technology is very important for plastic injection mold manufacturing. It has a great impact on the quality of plastic injection molds. It helps to obtain a beautiful surface and smooth ejection. Plastic injection mold polishing generally uses oilstone, sandpaper, polishing paste, etc. to polish the cavity surface of the plastic injection mold, so that the working surface of the plastic injection mold is as bright as a mirror. It is called mirror processing of plastic injection molds. Plastic injection mold polishing has two purposes; one is to increase the finish of the plastic injection mold, so that the surface of the product from the mold is smooth, beautiful, and beautiful; the other is to make the plastic injection mold easy to demold, so that the plastic does not stick to the plastic injection mold, cannot be removed.
Polishing is a very important process in the manufacturing process of plastic injection molds. With the increasing use of plastic products, the appearance quality of plastic products is getting higher and higher. Therefore, the quality of mirror processing of plastic injection molds should be improved accordingly, especially for mirrors and high-gloss and high-gloss surfaces, which require higher roughness of the working surface of the plastic injection mold, and therefore higher requirements for polishing. Polishing not only increases the aesthetics of the workpiece, but also improves the corrosion resistance and wear resistance of the material surface. It also facilitates subsequent injection processing, such as making plastic products easy to demold and shortening the production injection cycle time.
The plastic injection mold polishing technology is a polishing method that cuts and plastically deforms the surface of the material to remove the polished protrusions to obtain a smooth surface. Whetstone strips, wool wheels, sandpaper, etc. are generally used, mainly relying on manual operations. Special parts such as the surface of the rotating body can use auxiliary tools such as turntables, and super-finishing methods can be used for high-quality surfaces. Ultra-precision grinding and polishing uses a special grinding tool, in a grinding and polishing liquid containing abrasives, tightly pressed on the surface of the workpiece to be processed for high-speed rotation. Using this technology, the surface roughness of Ra0.008um can be reached, which is the highest among various polishing methods. This method is often used in plastic injection molds for optical lenses. The plastic injection mold polishing technology in plastic injection mold processing is very different from the surface polishing required by other industries. Strictly speaking, the polishing technology of plastic injection molds should be called mirror processing of plastic injection molds. It not only has high requirements for polishing itself, but also has high standards for the surface finish, smoothness and geometric accuracy of the working surface of the plastic injection mold. Surface polishing generally only requires a bright surface. Due to electrolytic polishing, it is difficult to accurately control the geometric accuracy of parts, fluid polishing, etc., while the surface quality of chemical polishing, ultrasonic polishing, magnetic abrasive polishing and other methods cannot meet the requirements.
Plastic injection mold polishing technology tool
Selection of tool materials
Sanding with sandpaper requires the use of soft wooden or bamboo sticks. When polishing round or spherical surfaces, the use of cork sticks can better match the curvature of the round and spherical surfaces; while the harder wooden sticks are suitable for polishing flat surfaces. The ends of the wooden strips are trimmed to keep the shape consistent with the surface of the steel sheet, which can prevent the deep corners of the wooden strips (or bamboo strips) from contacting the surface of the steel sheets and cause deep scratches.
Selection of polishing direction and cleaning of polishing surface
When changing to a different type of sandpaper, the polishing direction should be changed 50°~45° from the previous polishing direction for polishing, so that the striped shadows left by the previous type can be distinguished from the polished sandpaper. For parting plastic injection molds, the final polishing pattern should be consistent with the ejection direction of the plastic part. Before changing different types of sandpaper, you need to carefully wipe the polished surface of the plastic injection mold with a cleaning solution such as alcohol or cotton balls. The polishing paste of the previous process is not allowed to enter the next process, especially the fine polishing stage. When changing from sandpaper polishing to diamond paste polishing, the cleaning process becomes particularly important. Before continuing the mirror processing of plastic injection molds, all particles and kerosene must be thoroughly cleaned.
Defects that may occur during polishing and their solutions
When grinding and polishing, not only the work surface needs to be cleaned, but the hands of workers must also be carefully cleaned; each time the plastic injection mold polishing technology should not be too long, the shorter the time, the better. There will be over-polishing, orange peel and pitting. In order to obtain high-quality polishing results, avoid using polishing methods and tools that are prone to heat. For example, the heat generated during the polishing process and excessive polishing force will cause orange peel, or the impurities in the material will separate from the metal structure during the polishing process, forming pitting corrosion. The solution is to increase the surface hardness of the polishing material, use soft polishing tools, high-quality alloy steel; use appropriate force during polishing, and complete the polishing in the shortest time. When the mirror processing of plastic injection molds is stopped, it is important to ensure that the surface of the workpiece is clean and carefully remove all abrasives and lubricants. At the same time, the surface of the working surface of the plastic injection mold should be sprayed with a layer of anti-rust coating of the plastic injection mold.
At Pubo, we are a plastic injection molding manufacturer with many years of business experience, helping customers complete all the work from prototype development to production. If you need an experienced partner, please contact us immediately.
Tags: Plastic injection mold polishing technology, the working surface of the plastic injection mold, mirror processing of plastic injection mold
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