Other Polishing Methods For Plastic Molds

Fluid polishing

Fluid polishing relies on high-speed flowing liquid and abrasive particles carried by it to wash the surface of the workpiece to achieve the purpose of polishing. Common methods are: abrasive jet processing, liquid jet processing, hydrodynamic grinding, etc. Hydrodynamic grinding is driven by hydraulic pressure, so that the liquid medium carrying abrasive particles flows back and forth across the workpiece surface at high speed. The medium is mainly made of special compounds (polymer-like substances) that flow through under low pressure and mixed with abrasives. The abrasives can be silicon carbide powder.

Magnetic grinding and polishing

Magnetic grinding and polishing is the use of magnetic abrasives to form abrasive brushes under the action of a magnetic field to grind workpieces. This method has high processing efficiency, good quality, easy control of processing conditions, and good working conditions. With a suitable abrasive, the surface roughness can reach Ra0.1μm. 2 Mechanical polishing based on this method The polishing in plastic mold processing is very different from the surface polishing required in other industries. Strictly speaking, the polishing of the mold should be called mirror processing. It not only has high requirements for polishing itself, but also has high standards for surface flatness, smoothness and geometric accuracy. Surface polishing generally requires only a shiny surface. The standard of mirror processing is divided into four levels: AO = Ra0.008μm, A1 = Ra0.016μm, A3 = Ra0.032μm, A4 = Ra0.063μm. It is difficult to precisely control the geometric accuracy of the part due to methods such as electrolytic polishing and fluid polishing. However, the surface quality of chemical polishing, ultrasonic polishing, magnetic abrasive polishing and other methods can not meet the requirements, so the mirror surface processing of precision molds is mainly mechanical polishing.

Basic procedures

In order to obtain high-quality polishing results, the most important thing is to have high-quality polishing tools and accessories such as whetstone, sandpaper and diamond abrasive paste. The choice of polishing program depends on the surface condition after the previous processing, such as machining, EDM, grinding and so on.

Post time: Apr-07-2021