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The Polishing Methods for Metal Workpieces

Views: 101     Author: Site Editor     Publish Time: 2021-07-03      Origin: Site

Generally speaking, polishing refers to the use of mechanical, chemical or electrochemical effects to reduce the surface roughness of the workpiece to obtain a bright and smooth surface. It is the use of polishing power tools and abrasive particles or other polishing media to modify the surface of the workpiece. Of course, the small power tools are often used such as rotary tools with right bits, electric stone grinder or grinding power tools etc. during the process.


We know that polishing can not only improve the dimensional accuracy or geometric accuracy of the workpiece, but also can obtain a smooth surface or mirror gloss. Sometimes it is also used to eliminate gloss. Usually a polishing wheel is used as a common use polishing power tool. The polishing wheel is generally made of multiple layers of canvas, felt or leather. The two sides are clamped by metal circular plates, and the rim is coated with a polishing agent that is uniformly mixed with micronized abrasives and grease. Here we will talk about several polishing methods for metal workpieces.


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Ultrasonic polishing


The workpiece is placed in an abrasive suspension and placed in an ultrasonic field, which depends on the vibration of the ultrasonic wave, which can manufacture abrasive grinding and polishing on the surface of the workpiece. Ultrasonic processing has low strength and will not cause deformation of the workpiece, but it is difficult to produce molds.


Usually ultrasonic treatment can be combined with chemical or electrochemical methods. At the root of solution corrosion and electrolysis, people use ultrasonic vibration to stir the solution to separate the dissolved products on the surface of the workpiece, and average corrosion or electrolyte on the left side of the surface. Ultrasonic cavitation in the liquid can also inhibit the corrosion process and facilitate the appearance of light.


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Electrolytic polishing


Its advantages are long mirror gloss, stable process, low pollution, low cost and good corrosion resistance. Its disadvantages are strong anti-pollution ability, large investment in one-time processing equipment, large and complex parts require tooling and auxiliary electrodes, and large-scale production also requires cooling equipment. It is suitable for mass production, and is mainly used for high-end products, export products, and durable goods. Its processing technology is stable and the operation is relatively simple.


The basic principle of electrolytic polishing is similar to chemical polishing, that is, the appearance of selectively dissolved substances is small and prominent, which can make the appearance smooth. Compared with chemical polishing, the cathode reflection effect is obvious and the effect is better.


Mechanical polishing


Mechanical polishing refers to a polishing method that obtains a smooth surface through cutting and plastic deformation of the material surface, which mainly depends on various power tools such as electrical rotary 

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