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Mold polishing has two purposes

2020-10-29 11:15:50

 

     Mold polishing has two purposes:


     1. Increase the smoothness of the mold, so that the surface of the mold product is smooth, beautiful and beautiful.


     2. The mold can be easily demolded, so that the plastic will not be stuck on the mold and cannot be taken off.


    Here is an introduction to the 6 processing methods commonly used for mold polishing:


     1. Mechanical polishing Mechanical polishing is a polishing method that relies on the plastic deformation of the surface of the cutting material to remove the polished protrusions to obtain a smooth surface. Generally, wool wheels, sandpaper, abrasive belts, nylon wheels, etc. are used. Manual operation is the main method. Special parts such as For the surface of the revolving body, auxiliary tools such as turntable can be used, and the method of ultra-precision polishing can be used for the surface quality requirements. Ultra-precision polishing is an abrasive tool specially made with abrasives. In a polishing liquid containing abrasives, it is pressed against the surface of the workpiece for high-speed rotation. Optical lens molds often use this method.


     2. Fluid polishing Fluid polishing relies on high-speed flowing liquid and the abrasive particles carried by it to wash the surface of the workpiece to achieve the purpose of polishing. Common methods include: abrasive emery jet processing, liquid jet processing, hydrodynamic grinding and so on. Hydrodynamic grinding is driven by hydraulic pressure to make the liquid medium carrying abrasive particles flow back and forth across the surface of the workpiece at high speed. The medium is mainly made of special compounds with good flowability under lower pressure and mixed with abrasives. The abrasives can be made of silicon carbide powder.


    3. Electrolytic polishing The basic principle of electrolytic polishing is the same as that of chemical polishing. At a certain temperature, voltage and current density, the tiny protrusions on the surface of the workpiece will first dissolve and gradually become a smooth and shiny surface. Compared with chemical polishing, the effect of cathode reaction can be eliminated, and the effect is better.


     4. Ultrasonic polishing Put the workpiece in the abrasive suspension and put it in the ultrasonic field together, relying on the oscillation effect of the ultrasonic, so that the abrasive is ground and polished on the surface of the workpiece. Ultrasonic machining has a small macroscopic force and will not cause deformation of the workpiece, but it is difficult to manufacture and install tooling. Ultrasonic processing can be combined with chemical or electrochemical methods. On the basis of solution corrosion and electrolysis, ultrasonic vibration is applied to stir the solution, so that the dissolved products on the surface of the workpiece are separated, and the corrosion or electrolyte near the surface is uniform. The cavitation effect of ultrasonic waves in the liquid can also inhibit the corrosion process, which is conducive to surface brightening.


    5. Chemical polishing Chemical polishing is to make the surface microscopic convex part of the material in the chemical medium dissolve preferentially than the concave part, so as to obtain a smooth surface. The main advantage of this method is that it does not require complex equipment, can polish workpieces with complex shapes, and can polish many workpieces at the same time, with high efficiency. The core problem of chemical polishing is the preparation of polishing liquid.


     6. Magnetic grinding and polishing Magnetic grinding and polishing is to use magnetic abrasives to form abrasive brushes 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 suitable abrasives, the surface roughness can reach Ra0.1μm


昆山希桦机械有限公司

    

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