Mechanical polishing is cutting, the surface plastic deformation of the material removes the polishing method of the smooth surface to obtain a smooth surface, generally uses the oil stone strip, wool wheel, sandpaper, etc., the main manual operation, special parts such as revolving the surface, Use the auxiliary tool such as turndomness, and the surface quality requirements can be used as a method of penetrating. Super-research throwing is a special abrasive tool, in a polishing liquid containing abrasive, is tight on the surface of the workpiece, performs high speed rotation. This technique can reach the surface roughness of Ra0.008um, which is the highest in various polishing methods. This method is often used in optical lens molds.
2. Chemical polishing
Chemical polishing is to allow the material to be prioruously dissolved in a portion of the surface microscopic surface in the chemical medium, thereby obtaining a smooth surface. The main advantage of this approach is that there is no need for complex devices, and the shape of the complex workpiece can be polished, and many workpieces can be polished, high efficiency. The core problem of chemical polishing is a preparation of polishing fluid. The surface roughness obtained by chemical polishing is generally 10 um.
3. Electrolysis polishing
The basic principle of electrolysis polishing is the same as that of chemical polishing, that is, the surface of the selective dissolved material surface is smooth, so that the surface is smooth. Compared with chemical polishing, it can eliminate the impact of the cathode reaction, and the effect is better. Electrochemical polishing process is divided into two steps:
(1) Macro-flat solubility is diffused into the electrolyte, and the surface geometric rough is decreased, Ra> 1 um.
(2) The micro-light is extremely polarized, and the surface light is increased, Ra <1um.
4. Ultrasonic polishing
The workpiece is placed in an abrasive suspension and placed together in an ultrasonic field, and the oscillating action of ultrasonic waves is placed on the surface of the workpiece surface. Ultrasonic machining macroscopic is small, which does not cause deformation of the workpiece, but tool making and installation is difficult. Ultrasonic machining can be combined with chemical or electrochemical methods. On the basis of corrosion and electrolysis, an ultrasonic vibration stirred solution is applied, and the surface dissolution product is removed from the surface of the workpiece, and the corrosion or electrolyte in the surface is uniform; the cavitation of ultrasonic waves can inhibit the corrosion process in the liquid, which is conducive to surface light brightness.
5. Fluid polishing
Fluid polishing is the purpose of relying on the surface of the high-speed flow and the surface of the grinding workpiece thereof. Common methods include: abrasive injection processing, liquid injection processing, fluid power grinding, and the like. The fluid power grinding is driven by hydraulic pressure, so that the liquid medium carrying abrasive grains is rehabilized by the surface of the workpiece. The medium is mainly made of special compounds (polymerized substances) that have flowed abutment under lower pressure and is made of abrasive, and the abrasive can employ silicon carbide powder.
6. Magnetic gear polishing
Magnetism grinding is to form an abrasive brush under magnetic field using magnetic abrasives to grind the workpiece. This method has high processing efficiency, good quality, easy processing conditions, good working conditions. With a suitable abrasive, the surface roughness can reach Ra0.1um.
The polishing of the plastic mold processing is very different from the surface polished surfaces required in other industries. Strictly, the polishing of the mold should be called mirror processing. It not only has high requirements for polishing itself and has high standards on surface flatness, smoothness, and geometric accuracy. Surface polishing is generally only required to obtain a bright surface. The standard of mirror processing is divided into four levels: AO = Ra0.008L M, A1 = Ra0.016um, A3 = Ra0.032um, A4 = Ra0.063um, due to electrolysis polishing, fluid polishing, etc., it is difficult to accurately control the geometric accuracy of the part Degree, and chemical polishing, ultrasonic polishing, magnetism polishing, etc. The surface quality of polishing and other methods can not reach the requirements, so the mirror processing of precision molds is mainly mechanical polishing.
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