Several Common Polishing Methods for Plastic Molds

As we all know, plastic molds are tools that match plastic molding machines in the plastic processing industry and give plastic products a complete configuration and accurate size. In the process of making plastic molds, in order to further improve its quality, we often need to perform polishing. Let's briefly introduce several common polishing methods for plastic molds.

1. Mechanical polishing

Mechanical polishing is a polishing method that removes the protruding parts of the workpiece surface by cutting or plastic deformation of the material surface to obtain a smooth surface. Generally, oilstone strips, wool wheels, sandpaper, etc. are used, and manual operation is the main method. For high surface quality requirements, ultra-fine grinding and polishing can be used. Ultra-fine grinding and polishing uses specially manufactured grinding tools, which are pressed tightly on the processed surface of the workpiece in a grinding and polishing liquid containing abrasives and rotate at high speed. This technology can achieve a surface roughness of ra0.008μm, which is the best surface roughness among various polishing methods. Optical lens molds often use this method. Mechanical polishing is the main method of mold polishing.

2. Chemical polishing

Chemical polishing is a material that allows the microscopic protruding parts of the surface to dissolve preferentially over the concave parts in a chemical medium, thereby obtaining a smooth surface. This method can polish workpieces with complex shapes and can polish many workpieces at the same time with high efficiency. The surface roughness obtained by chemical polishing is generally ra10μm.

3. Electrolytic polishing

The basic principle of electrolytic polishing is the same as that of chemical polishing, that is, it selectively dissolves the tiny protrusions on the surface of the material to make the surface smooth. Compared with chemical polishing, it can eliminate the influence of cathode reaction and has better effect.

4. Ultrasonic polishing

Ultrasonic polishing is a processing method that uses ultrasonic vibration of the tool section to polish brittle and hard materials through abrasive suspension. The workpiece is placed in the abrasive suspension and placed in the ultrasonic field together. Relying on the oscillation of the ultrasonic wave, the abrasive is ground and polished on the surface of the workpiece. Ultrasonic processing has small macroscopic force and will not cause deformation of the workpiece, but the tooling is difficult to make and install.

6. Magnetic grinding and polishing

Magnetic grinding and polishing is to use magnetic abrasives to form abrasive brushes under the action of magnetic field to grind the workpiece. This method has high processing efficiency, good quality, and easy to control processing conditions. With suitable abrasives, the surface roughness of the processed surface can reach ra0.1μm.

7. Electrospark ultrasonic composite polishing

In order to increase the polishing speed of workpieces with surface roughness ra above 1.6μm, ultrasonic waves and a special high-frequency narrow pulse high-peak current pulse power supply are used for composite polishing. The ultrasonic vibration and electric pulse corrosion act on the workpiece surface at the same time, quickly reducing its surface roughness. This has a significant polishing effect on the rough surface of the mold after turning, milling, electrospark and wire cutting, and is very effective.

Qingdao Xueyu Molding Products Co., Ltd. is mainly engaged in the design and manufacturing of injection molds, injection molding and secondary processing (spraying, pad printing, ultrasonic welding, stamping), etc. For more information about plastic mold, please contact us.

Website: www.xyzmould.com

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