Mold Polishing

How to polish a good mold?

Plastic mold polishing near me. In the process of diversification and high grade development of industrial products, how to improve the die quality, which directly affects the product quality, is an important task. In the process of plastic molds manufacturing, smooth machining and mirror machining after shape machining are called surface grinding and polishing of parts, which is an important process to improve plastic molds quality. Mastering reasonable polishing method can improve die quality and service life, and then improve product quality.

A) Normal ways to polish

a) Mechanical polishing is a polishing method to remove the protruding part of the surface of the workpiece to obtain smooth surface by cutting or plastic deformation of the surface of the material. Oil and stone strips, woolen wheels, sandpaper and so on are generally used to operate by hand. The method of ultra-fine polishing can be used for high surface quality requirements. Ultra-fine polishing is a special grinding tool. In the abrasive solution, it is pressed on the machined surface of the workpiece and rotates at high speed. The surface roughness of ra0.008 μ m can be achieved by using this technique, and the surface roughness is the best among all kinds of polishing methods. This method is often used in optical lens mold. Mechanical polishing is the main method of die polishing.

b) Chemical polishing is the preferential dissolution of the microscopic protruding part of the surface in the chemical medium, so that the smooth surface can be obtained. This method can polish complex workpiece, can polish many workpiece at the same time, the efficiency is high. The surface roughness obtained by chemical polishing is generally ra10 μ m.

c) The basic principle of electrolytic polishing is the same as that of chemical polishing, that is, the surface is smooth by selectively dissolving the surface. Compared with chemical polishing, it can eliminate the effect of cathode reaction, and the effect is better.

d) Ultrasonic polishing is a kind of machining method which uses tool section as ultrasonic vibration and polishing brittle hard material by abrasive suspension. The workpiece is put into the abrasive suspension and placed together in the ultrasonic wave field, and the abrasive is ground and polished on the surface of the workpiece by the vibration of ultrasonic wave. Ultrasonic machining has little macro force and will not cause workpiece deformation, but it is difficult to make and install tools.

e) Fluid polishing depends on flowing liquid and its abrasive particles to wash the surface of workpiece to achieve the purpose of polishing. Hydrodynamic grinding is driven by hydraulic pressure. The medium is mainly made of special compound (polymer material) with good flow performance at low pressure and mixed with abrasive. The abrasive can be made of silicon carbide powder.

f) Magnetic grinding and polishing is to use magnetic abrasive to form abrasive brush under the action of magnetic field to grind the workpiece. This method has the advantages of high processing efficiency, good quality and easy control of processing conditions. With suitable abrasive, the surface roughness can reach ra0.1 μ m.

g) In order to improve the polishing speed of workpiece with ra of more than 1.6 μ m, ultrasonic wave and special pulse power supply with high frequency narrow pulse and high peak current are used for compound polishing. The corrosion of ultrasonic vibration and electric pulse acts on the surface of the workpiece at the same time, and the surface roughness of the workpiece is reduced rapidly, which is very effective for polishing the rough surface of the die machined by turning, milling, EDM and wire cutting.