Mold polishing method
The method of mold polishing is as follows:
Mechanical polishing
Mechanical cutting, polishing is to rely on material surface plastic deformation after removed by polishing the convex part of the smooth surface polishing method, commonly used article oil stone, wool wheel, abrasive paper, etc., with manual operation is given priority to, special components such as surface of solid of revolution, can use tools such as turntable, high surface quality can be used over lapping method.Ultra-fine grinding and polishing is the use of special grinding tools, in the grinding and polishing liquid containing abrasive, compact pressure on the workpiece is processed on the surface, for high-speed rotary movement.Surface roughness of Ra0.008 m can be achieved with this technique, which is the highest among all polishing methods.This method is often used in optical lens moulds.
Chemical polishing
Chemical polishing is to allow the material in the chemical medium surface micro convex part of the concave part of the solution priority, so as to get a smooth surface.The main advantage of this method is that it does not need complex equipment, can polish the workpiece with complex shape, can polish many workpieces at the same time, high efficiency.The key problem of chemical polishing is the preparation of polishing fluid.The surface roughness obtained by chemical polishing is generally 10 m.
Electrolytic polishing
The basic principle of electropolishing is the same as that of chemical polishing, that is, by selectively dissolving tiny protrusions on the surface of materials to make the surface smooth.Compared with chemical polishing, the effect of cathode reaction can be eliminated.The electrochemical polishing process is divided into two steps: (1) diffusion of the macroscopic leveling product to the electrolyte, reduction of the material surface geometric roughness, Ra>1 m.The low-light flat anode polarization, surface brightness, Ra<1 m.
Ultrasonic polishing
The workpiece is placed in the suspension of the abrasive and placed in the ultrasonic field together.The macroscopic force of ultrasonic machining is small, which will not cause the workpiece deformation.Ultrasonic machining may be combined with chemical or electrochemical methods.On the basis of solution corrosion and electrolysis, ultrasonic vibration stirring solution is applied to make the surface of workpiece dissolute and corrosion or electrolyte near the surface even.Ultrasonic cavitation in the liquid can also inhibit the corrosion process, conducive to surface lighting.
Fluid polishing
Fluid polishing relies on high-speed liquid and abrasive particles carried by it to wash the surface of workpiece to achieve the purpose of polishing.Common methods are: abrasive jet machining, liquid jet machining, hydrodynamic grinding, etc.Hydrodynamic grinding is driven by hydraulic pressure, so that the liquid medium carrying abrasive particles reciprocates through the workpiece surface at high speed.The medium is mainly made of special compound (polymer substance) with good flowability under low pressure and mixed with abrasive, which can be made of silicon carbide powder.
Magnetic grinding and polishing
Magnetic grinding and polishing is the use of magnetic abrasive in the magnetic field under the action of the formation of abrasive brush on the workpiece grinding.This method has high processing efficiency, good quality, easy control of processing conditions and good working conditions.The surface roughness can be up to 0.1 m with suitable abrasive.2 mechanical polishing based on this method in the processing of plastic mold said polishing and other industries require the surface polishing is very different, strictly speaking, the mold polishing should be called mirror processing.It has high requirements not only for polishing itself but also for surface smoothness, smoothness and geometric accuracy.Surface polishing generally requires only a bright surface can be.Mirror processing standard is divided into four levels: AO = Ra0.008 microns, A1 = Ra0.016 microns, A3 = Ra0.032 microns, A4 = Ra0.063 microns, such as electrolytic polishing, fluid polishing methods are difficult to control parts of geometry accuracy, precision and chemical polishing, ultrasonic polishing, magnetic abrasive polishing methods, such as surface quality can not meet the requirements, so the precision mould mirror processing is given priority to with mechanical polishing.
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