Several Polishing Methods For Pneumatic Polishing Machines
Several Polishing Methods for Pneumatic Polishing Machines
Pneumatic polishing machine is mainly on the surface of the object grinding and polishing, polished solder joints, surface roughness, mirror polishing and other treatment. Widely used in machine tools, automobile manufacturing, shipbuilding, furniture and other industries. The main polishing methods are magnetic grinding and polishing, mechanical polishing, chemical polishing, electrolytic polishing, ultrasonic polishing, fluid polishing. The specific methods are described below:
First, magnetic grinding and polishing
Magnetic grinding and polishing is the use of magnetic abrasive in the field under the action of the formation of abrasive brush, the workpiece grinding. This method of processing high efficiency, good quality, easy to control the processing conditions, good working conditions. With a suitable abrasive, the surface roughness can reach Ra0.1 μ m.
Second, mechanical polishing
Mechanical polishing is to rely on cutting, plastic deformation of the surface to remove the polished polished surface and get a smooth surface of the polishing method, the general use of oil stone, wool wheel, sandpaper, etc., mainly to manual operation, special parts such as the surface of the rotor can be The use of turntable and other auxiliary tools, high surface quality requirements can be used super-fine grinding method. Ultra-fine grinding is the use of special abrasive, containing abrasive in the polishing liquid, the workpiece in the workpiece surface, for high-speed rotary motion. Using this technology can achieve Ra0.008 μ m surface roughness, is the highest of a variety of polishing methods. Optical lens molds often use this method.
Third, chemical polishing
Chemical polishing is to let the material in the chemical medium in the surface of the micro-protruding part of the concave part of the priority to dissolve, resulting in a smooth surface. The main advantage of this method is the need for complex equipment, you can polish the shape of the complex parts, you can polish a lot of workpieces, high efficiency. The core problem of chemical polishing is the preparation of the polishing solution. Chemical polishing results in a surface roughness of typically 10 μ m.
Fourth, electrolytic polishing
The basic principle of electrolytic polishing and chemical polishing the same, that is, by selectively dissolving the surface of the material slightly protruding part of the surface smooth. Compared with the chemical polishing, can eliminate the impact of the cathode reaction, the effect is better. The electrochemical polishing process is divided into two steps:
(1) macroscopic leveling of the dissolved product to the electrolyte diffusion, the material surface roughness decreased, Ra> 1 μ m.
(2) Smoothing Anodic polarization, surface brightness increased, Ra <1 μ m.
Fifth, ultrasonic polishing
Place the workpiece in the abrasive suspension and place it in the ultrasonic field together, relying on the oscillating effect of the ultrasonic wave to grind the abrasive on the surface of the workpiece. Ultrasonic processing of small macro, will not cause deformation of the workpiece, but the tooling production and installation more difficult. Ultrasonic processing can be combined with chemical or electrochemical methods. On the basis of corrosion and electrolysis of the solution, the ultrasonic vibration stirring solution is applied to separate the dissolution products on the surface of the workpiece, and the corrosion or electrolyte in the vicinity of the surface is uniform. The cavitation effect of the ultrasonic wave in the liquid can also inhibit the corrosion process and facilitate the brightening of the surface.
Six, fluid polishing
Fluid polishing is to rely on high-speed flow of liquid and carry the abrasive particles to wash the surface of the workpiece to achieve the purpose of polishing. Common methods are: abrasive jet processing, liquid jet processing, hydrodynamic grinding and so on. Fluid power grinding is driven by the hydraulic, so that the liquid medium carrying abrasive high-speed reciprocating flow through the workpiece surface. The medium is mainly made with a special compound (polymer-like substance) with good flowability at lower pressure and mixed with abrasive. The abrasive can be made of silicon carbide powder.
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