Several ways to realize mirror processing

Mirror machining means that the machined surface can reflect the image like a mirror, which has reached a very good surface quality of the workpiece. Mirror machining can not only create a high “face value” for the product, but also reduce the notch effect and prolong the fatigue life of the workpiece. It is of great significance in many assembly and sealing structures. The polishing mirror processing technology is mainly used to reduce the surface roughness of the workpiece. When selecting the polishing process method for the metal workpiece, different methods can be selected according to different needs. The following are several common methods of polishing mirror processing technology.

 

1. Mechanical Polishing Mechanical polishing is a polishing method to get a smooth surface by cutting and plastic deformation of the material surface to remove the polished convex parts. Generally, oilstone strips, wool wheels, sandpaper, etc. are used, and manual operation is the main method. For special parts such as the surface of a revolving body, auxiliary tools such as a turntable can be used. If the surface quality is high, the method of ultra-precision grinding and polishing can be used. Ultra-precision grinding and polishing is to use a special abrasive tool, which is pressed tightly on the machined surface of the workpiece in the grinding and polishing liquid containing abrasive, and makes a high-speed rotating motion. The surface roughness of Ra0.008μm can be achieved by this technology, which is the highest among all kinds of polishing methods. This method is often used in optical lens molds.

2. Chemical Polishing Chemical polishing is to make the micro-protruding part of the surface of the material dissolve preferentially over the concave part in the chemical medium, thus obtaining a smooth surface. The main advantage of this method is that it does not need complex equipment, can polish workpieces with complex shapes, can polish many workpieces at the same time, and has high efficiency. The core problem of chemical polishing is the preparation of polishing solution. The surface roughness obtained by chemical polishing is generally 10 μ m.

3. Electrolytic Polishing The basic principle of electrolytic polishing is the same as that of chemical polishing, that is, the surface is smooth by selectively dissolving tiny protrusions on the surface of the material. Compared with chemical polishing, it can eliminate the influence of cathode reaction and has better effect. The electrochemical polishing process is divided into two steps: (1) Macroscopically leveling the diffusion of dissolved products into the electrolyte, and the geometric roughness of the material surface decreases, with Ra > 1 μ m.. (2) The anode polarization is smoothed by low light level, and the surface brightness is improved, with Ra < 1 μ m..

4. Haokeneng Mirror Processing Equipment

As a new polishing process, it has unique advantages in processing many kinds of metal parts. It can replace the traditional grinding machine, rolling, boring and rolling, honing, polishing machine, abrasive belt machine and other metal surface finishing equipment and processes; So that high-finish machining of metal workpieces becomes a piece of cake. Hawke can not only polish, but also bring many additional benefits: it can improve the surface smoothness of the machined workpiece by more than 3 grades (the roughness Ra value can easily reach below 0.2); And the surface microhardness of the workpiece is improved by more than 20%; And the surface wear resistance and corrosion resistance of the workpiece are greatly improved. Haokeneng can be used to process all kinds of stainless steel and other metal workpieces.

5. Ultrasonic Polishing: Put the workpiece into the abrasive suspension and put it in the ultrasonic field together, and grind and polish the abrasive on the surface of the workpiece by the oscillation of the ultrasonic wave. Ultrasonic machining has small macroscopic force and will not cause workpiece deformation, but it is difficult to make and install the tooling. Ultrasonic machining can be combined with chemical or electrochemical methods. On the basis of solution corrosion and electrolysis, ultrasonic vibration is applied to stir the solution, so that the dissolved products on the surface of the workpiece are separated and the corrosion or electrolyte near the surface is uniform; The cavitation of ultrasonic wave in liquid can also inhibit the corrosion process, which is beneficial to surface brightening.

6. Fluid polishing Fluid polishing relies on the high-speed flowing liquid and the abrasive particles it carries to scour the surface of the workpiece to achieve the purpose of polishing. Commonly used methods include abrasive jet machining, liquid jet machining, hydrodynamic grinding and so on. Hydrodynamic grinding is driven by hydraulic pressure, which makes the liquid medium carrying abrasive particles flow across the workpiece surface at high speed. The medium is mainly made of a special compound (polymer-like substance) with good fluidity at low pressure and doped with abrasive, and the abrasive can be silicon carbide powder.

7. Mirror polishing mirror, magnetic grinding polishing magnetic grinding polishing is to use magnetic abrasive to form an abrasive brush under the action of magnetic field to grind the workpiece. This method has the advantages of high processing efficiency, good quality, easy control of processing conditions and good working conditions. With proper abrasive, the surface roughness can reach Ra0.1μm m.. Polishing in plastic mold processing is very different from surface polishing required in other industries. Strictly speaking, mold polishing should be called mirror processing. It not only has high requirements for polishing itself, but also has high standards for surface flatness, smoothness and geometric accuracy. Surface polishing generally only requires obtaining a bright surface. The standard of mirror machining is divided into four levels: ao = Ra 0.008 μ m, A1 = Ra 0.016 μ m, A3 = Ra 0.032 μ m, A4 = Ra 0.063 μ m. Because it is difficult to accurately control the geometric accuracy of parts by electrolytic polishing, fluid polishing and other methods, and the surface quality of chemical polishing, ultrasonic polishing and magnetic grinding polishing can not meet the requirements, the mirror machining of precision molds is mainly mechanical polishing.

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