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                            A brief description of the polishing method of aluminum die casting
The surface technology of aluminum die casting parts is rich and varied, and polishing treatment is only one of them, but it is an important process to improve the quality of aluminum die casting parts. Mastering the reasonable polishing method can improve the quality and performance of aluminum  die casting parts, and thus improve the quality of aluminum alloy die casting products.
Regarding the polishing of the workpiece, in addition to the conventional mechanical polishing and chemical polishing, there are technologies such as electrolytic polishing, ultrasonic polishing, fluid polishing, magnetic polishing, and medium electric spark ultrasonic composite polishing. The basic principle of electrolytic polishing of aluminum alloy die-casting parts is the same as that of chemical polishing, mainly relying on selectively dissolving tiny protruding portions on the surface of the material to make the surface smooth. Compared with chemical polishing, it can eliminate the influence of the cathode reaction and has a good effect.
Ultrasonic polishing of aluminum alloy die-casting parts is a processing method of polishing brittle hard materials by abrasive suspension by ultrasonic vibration of the tool section. The workpiece is placed in an abrasive suspension and placed together in an ultrasonic field, and the abrasive is ground and polished on the surface of the workpiece by the action of ultrasonic waves.
The fluid polishing technology of aluminum alloy die-casting parts relies on the flowing liquid and the abrasive particles carried by it to wash the surface of the workpiece for polishing. Hydrodynamic grinding is driven by hydraulics. The medium is mainly made of a special compound that flows at a lower pressure and is incorporated into an abrasive. The abrasive can be made of silicon carbide powder.
Magnetic grinding and polishing is also one of the polishing techniques involved in the processing of aluminum alloy die-casting parts. The magnetic abrasive is used to form an abrasive brush under the action of a magnetic field to grind the workpiece. This method has high processing efficiency, good quality and easy control of processing conditions. With a suitable abrasive, the surface roughness of the machine can be achieved up to 0.1 μm.

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