What Are The Polishing Methods Commonly Used In Aluminum Profile Die Casting?
1, mechanical polishing
Mechanical polishing is to rely on cutting, the 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., to manual operation, the surface quality requirements can be used super Grinding method. Ultra-fine grinding is the use of special abrasive, containing abrasive in the research and polishing liquid, pressed in the Aluminum Profile die casting surface is machined for high-speed rotary motion. With this technique, the surface roughness of Ra0.008μ m can be achieved, which is the highest among the various polishing methods. Optical lens molds often use this method.
2, chemical polishing
Chemical polishing is to make Aluminum Profile die castings 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 complex Aluminum Profile die casting, you can polish a lot of Aluminum Profile die casting, high efficiency. The core issue of chemical polishing is the preparation of the polishing solution. The surface roughness obtained by chemical polishing is generally 10 μ m.
3, 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 parts, Aluminum Profile surface to 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, Aluminum Profile die casting surface roughness decreased, Ra> 1 μ m.
(2) Smoothing Anodic polarization, surface brightness increased, Ra <1 μ m.
4, ultrasonic polishing
The Aluminum Profile die casting into the abrasive suspension and placed together in the ultrasonic field, relying on the role of ultrasonic oscillation, the abrasive in the Aluminum Profile casting surface grinding and polishing. Ultrasonic processing of small macro, will not cause deformation of Aluminum Profile die casting, but the tooling production and installation more difficult. Ultrasonic processing can be combined with chemical or electrochemical methods. In the solution corrosion, electrolysis, and then the application of ultrasonic vibration stirring solution, so that the surface of aluminum die casting product dissociation, near the surface of the corrosion or electrolyte uniform; ultrasonic cavitation in the liquid can also inhibit the corrosion process, conducive to the surface Brightened.
5, fluid polishing
Fluid polishing is to rely on high-speed flow of liquid and carry the abrasive grain erosion Aluminum Profile casting surface 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 Aluminum Profile die casting 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.
6, magnetic grinding and polishing
Magnetic grinding and polishing is the use of magnetic abrasive in the magnetic field under the action of the formation of abrasive brush, Aluminum Profile casting die casting. This method of processing high efficiency, good quality, easy to control the processing conditions, good working conditions. With the appropriate abrasive, the surface roughness can reach Ra0.1 μ m.