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Magnetic grinding and polishing
Magnetic grinding and polishing uses magnetic abrasives to form an abrasive brush under the action of a magnetic field to grind the workpiece. This method has high processing efficiency, good quality, easy control of processing conditions, and good working conditions. Using appropriate abrasives, the surface roughness can reach Ra0.1 μm.
The polishing mentioned in plastic mold processing is very different from the surface polishing required in other industries. Strictly speaking, the polishing of molds should be called mirror processing. It not only has high requirements for the polishing itself but also has high standards for surface flatness, smoothness and geometric accuracy. Surface polishing generally only requires obtaining a bright surface. The standards for mirror processing are divided into four levels: AO=Ra0.008 μm, A1=Ra0.016 μm, A3=Ra0.032 μm, A4=Ra0.063 μm. Due to the difficulty of electrolytic polishing, fluid polishing and other methods It is difficult to precisely control the geometric accuracy of parts, and the surface quality of chemical polishing, ultrasonic polishing, magnetic grinding and polishing methods cannot meet the requirements, so the mirror processing of precision molds is still mainly based on mechanical polishing.
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