Do you know how to do the polishing of aluminum alloy die casting?
Die-casting mechanical polishing of aluminum alloy is a polishing method which relies on the cutting and plastic deformation of the material surface to remove the polished convex part and obtain a smooth surface. Generally use whetstone rod, wool wheel, sandpaper, etc., mainly manual operation. The superfinishing method can be used for high surface quality requirements. The superfinishing method uses special abrasives to rotate at high speeds on the machined surface of the aluminum alloy die cast by pressing in a polishing fluid containing abrasives.
1. Mechanical polishing
Aluminum alloy die-castingMechanical polishing is a polishing method that relies on the cutting and plastic deformation of the material surface to remove the polished bulge and obtain a smooth surface. Generally, it uses an oilstone stick, wool wheel, sandpaper, etc., mainly manual operation. The ultra precision polishing method can be used for high surface quality requirements. The ultra precision polishing uses special abrasive tools to rotate at high speed on the machined surface of aluminum alloy die castings under the pressure of polishing liquid containing abrasive p>
2. Chemical polishing
Chemical polishing of aluminum alloy die castings is to make aluminum alloy die castings dissolve preferentially in the chemical medium than the surface recesses, so as to obtain a smooth surface. The main advantage of this method is that it does not need complex equipment, and it can polish aluminum alloy die castings with complex shapes, and multiple aluminum alloy die castings can be polished at the same time, with high efficiency. The core problem of chemical polishing is the preparation of polishing solution, and the surface roughness obtained by chemical polishing is generally tens of microns p>
3. Electrolytic polishing
The basic principle of electrolytic polishing for aluminum alloy die castings is the same as that of chemical polishing. That is, the surface of die castings is made smooth by selectively dissolving the small protrusions on the surface. Compared with chemical polishing, it can eliminate the influence of cathodic reaction and has better effect p>
4. Ultrasonic polishing
Place aluminum alloy die castings in the abrasive suspension, put them together in the ultrasonic field, and polish the surface of aluminum alloy die castings on the abrasive by means of ultrasonic vibration. Ultrasonic machining has small macroscopic stress, which will not cause deformation of aluminum alloy die castings, but it is difficult to make and install tooling. Ultrasonic machining can be combined with chemical or electrochemical methods. On the basis of solution corrosion and electrolysis, ultrasonic vibration is used to stir the solution. The dissolved products on the surface of aluminum alloy die castings are separated, and the corrosion or electrolyte near the surface is uniform; The cavitation effect of ultrasonic wave in liquid can also inhibit the corrosion process, which is beneficial to the surface brightness p>
5. Fluid polishing
Fluid polishing of aluminum alloy die-casting is to clean the surface of aluminum alloy die-casting parts by relying on high-speed liquid and its abrasive particles, so as to achieve the purpose of polishing. Common methods include abrasive jet machining, liquid jet machining, hydraulic grinding, etc. Hydraulic grinding is driven by hydraulic pressure to make the liquid medium carrying abrasive particles flow back and forth on the surface of aluminum alloy die castings at a high speed. The medium is mainly made of special compound (polymer like material) mixed abrasives with good fluidity under low pressure. As an abrasive, silicon carbide powder can be used p>
6. Magnetic abrasive polishing
Magnetic abrasive polishing is to use magnetic abrasive to form a brush under the action of magnetic field to grind aluminum alloy die castings. This method has high processing efficiency, good quality, easy control of processing conditions, and good working conditions. With proper abrasive, the surface roughness can reach Ra0.1 μ m。 p>