Zinc alloy die casting is a kind of precision casting method, which uses high pressure to force the metal to melt hydraulically into the metal mold with complex shape. It is a precision casting method. Zinc alloy die casting is a process used in many industries now. In the process of zinc alloy die casting, polishing will also be used. The function of polishing is OK. It has good casting performance. It can die cast precision parts with complex shape and thin wall, and the casting surface is smooth. This is also what many customers need, so let's learn about it. What are the common polishing methods for zinc alloy die casting?

1. Mechanical polishing

The mechanical polishing used is a polishing method to remove the protruding part of the workpiece surface to obtain a smooth surface by cutting or plastic deformation of the data surface. In the polishing liquid containing abrasive, it is tightly pressed on the machined surface of the workpiece for high-speed rotation. Ra0.008 can be reached by using this technology μ The surface roughness of M is better than that of various polishing methods. Mechanical polishing is the method to be used in mold polishing.

2. Chemical polishing

Chemical polishing is to make the micro convex part of the surface dissolve preferentially than the concave part in the chemical medium, and then get the smooth surface. This method can polish the workpieces with messy shape, and can polish many workpieces together with high efficiency. The surface roughness obtained by chemical polishing is generally RA10 μ m。

3. Electrolytic polishing

The basic principle of electropolishing is the same as that of chemical polishing, that is, by selectively dissolving the slender protruding part on the surface of the data to make the surface smooth. Compared with chemical polishing, it can eliminate the influence of cathode reaction, and the effect is better.

4. Ultrasonic polishing

Ultrasonic polishing is a processing method that uses the East-West section for ultrasonic vibration to polish brittle and hard data through abrasive suspension. The workpiece is put into the abrasive suspension and placed in the ultrasonic field together. Relying on the ultrasonic vibration effect, the abrasive is ground and polished on the surface of the workpiece. The micro force of ultrasonic machining is small and will not cause workpiece deformation, but it is difficult to make tooling and equipment.

5. Fluid polishing

Fluid polishing relies on the moving liquid and its abrasive particles to wash the surface of the workpiece to achieve the purpose of polishing. Hydrodynamic grinding is driven by hydraulic pressure. The medium is mainly made of special compounds (polymer like substances) with good flowability under low pressure and mixed with abrasives. The abrasives can be silicon carbide powder.

6. Magnetic abrasive polishing

Magnetic abrasive polishing is to use magnetic abrasive to form abrasive brush under the effect of magnetic field to grind the workpiece. This method has high processing efficiency, good quality and simple control of processing conditions. The surface roughness can reach RA 0.1 by selecting appropriate abrasives μ m。