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Seven ways to easily finish “mirror processing”

What is mirror finishing?

Mirror processing means that the processed surface can reflect the image like a mirror, which has achieved very good surface quality of the workpiece. Mirror processing can not only create a high “appearance 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. Polishing mirror processing technology is mainly used to reduce the surface roughness of the workpiece. When selecting the polishing process method for metal workpiece, different methods can be selected according to different needs. The following are several common methods of polishing mirror processing technology.

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 convex part after polishing. It generally uses oilstone strip, wool wheel, sandpaper, etc. it is mainly manual operation. For special parts such as revolving body surface, auxiliary tools such as turntable can be used. For those with high surface quality requirements, ultra precision polishing method can be used. Ultra precision lapping and polishing is a kind of special abrasive tool. In the lapping and polishing fluid containing abrasive, it is pressed tightly on the machined surface of the workpiece to rotate at high speed. The surface roughness ra0.008 can be achieved by using this technology μ m. It is the highest of all kinds of polishing methods, which is often used in optical lens mold.
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Chemical polishing 

Chemical polishing is to make the micro protruding part of the material surface dissolve preferentially than the concave part in the chemical medium, so as to obtain a smooth surface. The main advantage of this method is that it does not need complex equipment, can polish complex shape workpiece, can polish many workpieces at the same time, high efficiency. The key problem of chemical polishing is the preparation of polishing solution. The surface roughness obtained by chemical polishing is generally 10 μ m。
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The basic principle of electropolishing is the same as that of chemical polishing, that is, to make the surface smooth by selectively dissolving the tiny protrusions on the surface of the material. Compared with chemical polishing, the effect of cathode reaction can be eliminated and the effect is better. The electrochemical polishing process is divided into two steps: (1) macro leveling, dissolution products diffuse into the electrolyte, the surface roughness of the material decreases, and RA > 1 μ m。( 2) The surface brightness is improved and RA < 1 μ m 。
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Haokeneng mirror processing equipment

As a new polishing process, it has unique advantages in many kinds of metal parts processing. It can replace the traditional grinding machine, rolling, boring, honing, polishing machine, abrasive belt machine and other metal surface finishing equipment and technology; So that the metal workpiece high finish processing becomes easy. Hooke can not only polish, but also bring a lot of additional benefits: it can improve the surface finish of the workpiece by more than 3 levels (the roughness Ra value can easily reach below 0.2); The surface microhardness of the workpiece is increased by more than 20%; And greatly improve the surface wear resistance and corrosion resistance of the workpiece. Hokkener can be used to deal with all kinds of stainless steel and other metal workpieces.
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Ultrasonic polishing

The workpiece is put into the abrasive suspension and placed together in the ultrasonic field, and the abrasive is ground and polished on the workpiece surface by the ultrasonic oscillation. The macro force of ultrasonic machining is small, which will not cause the deformation of the workpiece, 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 to separate the dissolved products from the surface of the workpiece, and the corrosion or electrolyte near the surface is uniform; The cavitation effect of ultrasonic in liquid can also inhibit the corrosion process, which is conducive to the surface lighting.

Fluid polishing

Fluid polishing relies on the high-speed flow of liquid and abrasive particles to wash the workpiece surface to achieve the purpose of polishing. The common methods are abrasive jet machining, liquid jet machining, hydrodynamic grinding and so on. Hydrodynamic grinding is driven by hydraulic pressure, which makes the liquid medium with abrasive particles flow through the workpiece surface at high speed. The medium is mainly made of special compound (polymer like substance) with good flow property under low pressure and mixed with abrasive. The abrasive can be silicon carbide powder.

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Magnetic abrasive polishing

Magnetic abrasive polishing is to use magnetic abrasive to form abrasive brush under the action of magnetic field to grind workpiece. This method has the advantages of high efficiency, good quality, easy control of processing conditions and good working conditions. The surface roughness can reach ra0.1 with suitable abrasives μ m 。 Polishing in plastic mold processing is very different from surface polishing required by 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 requires only a bright surface. The standard of mirror finishing is divided into four levels: Ao = ra0.008 μ m,A1=Ra0.016 μ m,A3=Ra0.032 μ m,A4=Ra0.063 μ m. Because it is difficult to accurately control the geometric accuracy of parts by electropolishing, fluid polishing and other methods, and the surface quality of chemical polishing, ultrasonic polishing, magnetic polishing and other methods can not meet the requirements, so the mirror machining of precision mold is mainly mechanical polishing.

Source: China Flange Manufacturer – Yaang Pipe Industry (

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

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