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Polishing treatment of plastic mold

With the wide range of plastic products, such as daily necessities and beverage packaging containers, etc., the appearance of the need to often require the surface of plastic mold cavity to achieve the level of mirror polished. The production of optical lenses, laser disc mould on surface roughness requirements are very high, so the polishing requirements are high. Polishing not only increases the appearance of the workpiece, but also can improve the material surface of the corrosion resistance, wear resistance, but also can make the mold has other advantages, such as making plastic products easy to release, reduce production injection cycle, etc.. So polishing is a very important process in the production of plastic mold.
At present, there are several methods of polishing:
1.1 mechanical polishing
Mechanical polishing by cutting, surface plastic deformation was removed after polishing and convex smooth surface polishing method, the general use of oilstone, wool wheel, sand paper, mainly manual, special parts such as rotary table surface, can use auxiliary tools such as high surface quality requirements can be used method ultra precision polishing. The ultra precision polishing is a special abrasive tool, which is used to make the high speed rotating movement in the process of grinding and polishing with the abrasive. Using this technique, the surface roughness of Ra0.008 M can be reached, and the highest of all kinds of polishing methods are achieved. This method is often used in optical lens die.
1.2 chemical polishing
Chemical polishing is to make the material in the chemical medium of the surface of the micro convex part of the concave part of the preferential dissolution, so as to get smooth surface. The main advantage of this method is that it does not require complex equipment, and can be polished to a complex workpiece, which can simultaneously polishing a lot of work, the efficiency is high. The core of chemical polishing is the preparation of polishing liquid. The surface roughness obtained by chemical polishing is generally 10 m.
1.3 electrolytic polishing
The basic principle of electrolytic polishing and chemical polishing the same, that is, by selective dissolution of the material surface micro convex part, so that the surface smooth. Compared with chemical polishing, it can eliminate the influence of the cathode, the effect is good. Electrochemical polishing process is divided into two steps:
(1) the macro leveling dissolved product diffusion to the electrolyte, the material surface geometric roughness decreased, Ra>1 M.
(2) the low level of the level of the anode polarization, the surface brightness increase, Ra<1 M.
1.4 ultrasonic polishing
Put the workpiece in the abrasive suspension and put it in the ultrasonic field, and depend on the vibration of ultrasonic, so that the abrasive in the workpiece surface grinding and polishing. The ultrasonic machining is small, will not cause the distortion of the workpiece, but it is difficult to manufacture and install. Ultrasonic processing can be combined with chemical or electrochemical methods. Based on the solution of corrosion, electrolysis, and ultrasonic vibration mixing solution, dissolving the product from the surface of the workpiece, near the surface of the electrolyte corrosion or uniform; ultrasonic cavitation in the liquid can also inhibit the corrosion process for surface light lighting.
1.5 fluid polishing
Fluid polishing is to achieve the purpose of polishing the surface of the workpiece with high speed liquid and its carrying. Commonly used methods are: abrasive jet machining, liquid injection processing, fluid power grinding, etc.. The fluid power is driven by hydraulic pressure, which makes the liquid medium with abrasive grains high speed reciprocating flow through the surface of the workpiece. The medium is mainly used in the low pressure flow of a good special compound (polymer material) and mixed with abrasive, abrasive can be used in silicon carbide powder.
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