Grinding and polishing machine manufacturers tell you to auto-polish The polishing method of the machine:
The alternating polishing method is a general term for the entire polishing process in which several polishing processes are alternately performed. It is commonly used in multi-component alloys and processes for multi-component alloys and processes requiring high polishing requirements for polishing surface roughness. For example, in the electropolishing of certain alloy parts, a coating layer on the surface of the part that seriously hinders electropolishing is sometimes formed, but the process roughness requirements of the polishing surface have not yet been reached. This requires a mechanical polishing in the middle of the electropolishing process to remove the cover layer formed during the electropolishing process and then perform electropolishing. This entire process of "electropolishing - mechanical polishing - electropolishing" is an example of an alternating polishing process.
Alternative polishing methods can be alternated once or multiple times. It is also not limited to the two polishing processes to be alternated. If necessary, a plurality of polishing processes may be alternately used for polishing until the polished surface reaches the process requirements.
It should be noted that the cover layer formed on the polished surface during the above electropolishing process does not have to be mechanically polished by polishing. Removal can also be removed by other simpler methods that do not seem to have a polishing effect. Chemical leaching is a highly efficient and rapid film removal method. For example, in the electroplating of a plate-shaped molybdenum article in a phosphoric acid-sulfuric acid-water mixed electrolyte, a blue-violet coating layer is quickly formed on the surface of the article. This layer rapidly thickens as the electropolishing process progresses, causing the electrolysis current to decrease rapidly. . When the electrolysis current is reduced to 1/3 to 1/5 or less of the original current, it will be basically stabilized. This is where the electropolishing process is almost stopped or lost. Removing the part and removing the blue-violet coating on the surface will reveal that the roughness of the polished surface does not meet the process requirements and needs to be polished. However, if the purple coating on the surface of the molybdenum part is not removed, electropolishing cannot be performed. This purple film can be removed by wiping with a wet cloth or by diluting with a dilute aqueous solution such as sodium hydroxide for several minutes.
Automatic Ultrasonic Polishing of Automatic Polishing Machines
; electrochemical ultrasonic polishing, referred to as electrolytic ultrasonic polishing. It is a combined polishing process of electropolishing and ultrasonic polishing. The comparative process test of Xi'an Institute of Technology in China proves that this combination polishing process obviously improves the polishing effect of single-use electropolishing or single-use ultrasonic polishing, and the polished surface has only a very light gray film, which is better than electric polishing. The thick film formed is much lighter. If after the composite polishing, the electrolytic circuit is turned off and polished by ultrasonic polishing for several seconds, the oxide film can be completely removed to obtain a smooth and bright surface.
The combination of electrolytic and ultrasonic polishing can achieve significant polishing results due to:
; The end of the special tool for ultrasonic polishing can remove the oxide film at the peak of the surface of the workpiece in time and accelerate the electropolishing reaction. However, it is not necessary to increase the voltage or current of the electropolishing, and the polishing surface can still be in the passivation region.
Ultrasonic polishing in a special electrolyte will produce high-frequency alternating hydraulic shock and cavitation at the end of the tool. Speed up the polishing process.
The ultrasonic wave produces a strong mechanical agitation effect on the electrolyte, so that the electrolyte is always in the process of the entire electrolytic ultrasonic combined polishing process. Stable state. There is no polarization, and the electrical parameters of the polishing operation are not affected, so the polishing effect can be improved and improved.
Electro-ultrasonic composite polishing method, which can quickly polish the surface of rough parts to Ra0.4υm, is a potential The new polishing processing technology is still further improved and perfected.
Electrical spark ultrasonic composite polishing method, an innovation of polishing technology in the 1980s, is Beijing Institute of Electrical Processing A prominent contribution to the smooth processing of superhard materials and their parts.
Polycrystalline diamond is one of the superhard materials because of its abundant resources, low cost, and hardness up to 4.9×102Pa The wear resistance exceeds that of natural diamond, and is widely used in various industries such as automobile, aerospace, aviation and geology, and is suitable for manufacturing cutting tools, wire drawing dies and petroleum geological drill bits. The electric spark ultrasonic composite polishing method is an ideal process technology for solving the surface polishing process of such a super-hard part formed by electric discharge machining. High work efficiency and good quality, with considerable social and economic benefits.
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