As we all know, plastic mold plastic processing industry and supporting the plastic molding machine, plastic products, in order to give the complete configuration and the exact size of the tool. In the production of the plastic mold process, in order to further improve its quality, we often need to be polished. Here we will simply introduce some common polishing method under plastic mold.
1, mechanical polishing
Mechanical polishing is by cutting the surface of the material or plastic deformation to get rid of surface projection smooth surface polishing method generally used Whetstone, wool wheel, sandpaper, mainly manual, requiring high surface quality can be Superfinishing throwing method. Superfinishing is cast using a special abrasive in polishing liquid containing abrasive, and pressed against the surface of the workpiece to be machined, high speed rotary motion. Using this technique can achieve ra0,008μm surface roughness, a variety of methods of polishing the surface roughness of the best. The optical lens mold often use this method. Mechanical polishing is the main method of polishing a mold.
2, the chemical polishing
Chemical polishing the surface of the material to make microscopic protruding part in the chemical medium priority than the concave portion is dissolved, resulting in a smooth surface. The method may be polishing the complex shape of the workpiece can be polished at the same time a lot of artifacts, and high efficiency. The surface roughness is generally obtained by chemical polishing ra10μm.
3, electropolishing
Electrolytic polishing and chemical polishing the same basic principles, namely the surface by selective dissolution small projecting portion so that the surface is smooth. Compared with chemical polishing, which can eliminate the influence of the cathodic reaction, the better.
4, ultrasonic polishing
Polishing tools is the use of ultrasound as ultrasonic vibration section, a processing method of polishing hard brittle material by abrasive suspension. The workpiece into the abrasive suspension and placed in an ultrasonic field together, relying on the role of ultrasonic oscillations, so that the abrasive surface of the workpiece grinding and polishing. Ultrasonic machining macroscopic force is small, it does not cause deformation of the workpiece, but the tooling fabrication and installation more difficult.
5, fluid polishing
Hydrofinish rely flowing liquid and carries abrasive scouring workpiece surface to achieve the purpose of polishing. Fluid energy mill is driven by a hydraulic medium used mainly in the lower pressure flowing through good special compound (polymer-like substance) and incorporated into the abrasive, abrasive silicon carbide powder can be used.
6, magnetic polishing
Magnetic abrasive polishing abrasive is formed by a magnetic abrasive brush in the magnetic field on the workpiece grinding. This method of high efficiency, good quality, easy to control processing conditions. Using a suitable abrasive machining surface roughness can be achieved ra0,1μm.
7, EDM ultrasonic composite polishing
In order to improve the surface roughness of the polishing rate than 1,6μm ra of the workpiece, ultrasonic pulses with a dedicated high-frequency narrow pulse peak current of the power supply polishing compound, and the effect of the electric pulse ultrasonic vibration while etching the surface of the workpiece, the rapid reduce the surface roughness, which molds the roughened surface by turning, milling, EDM wire cutting and other processing after polishing effect is obvious, very effective.
