In the mold manufacturing process, smooth processing and mirror processing after shape processing are called surface grinding and polishing of parts, which is an important process to improve the quality of the mold. Mastering a reasonable polishing method can improve mold quality and service life, thereby improving product quality.
Mechanical polishing is a polishing method that removes the convex surface of the surface of the workpiece by cutting or plastically deforming the surface of the material to obtain a smooth surface. Generally, oil stone strips, wool wheels, sandpaper, etc. are used, which are mainly manual operations, and the surface quality requirements are high. Super fine grinding method. Ultra-fine grinding and polishing is a special-purpose grinding tool. In the polishing liquid containing abrasive, it is pressed against the machined surface to perform high-speed rotary motion. With this technology, a surface roughness of Ra0.008 μm can be achieved, which is the best surface roughness in various polishing methods. This method is often used in optical lens molds. Mechanical polishing is the main method of mold polishing.
2. Chemical polishing
Chemical polishing is a process in which a material in a chemical medium causes a slightly convex portion of the surface to preferentially dissolve, thereby obtaining a smooth surface. The method can polish a workpiece with a complicated shape and can polish many workpieces at the same time with high efficiency. The surface roughness obtained by chemical polishing is generally Ra10 μm.
The basic principle of electropolishing is the same as chemical polishing, which is to selectively dissolve the surface of the material to make the surface smooth. Compared with chemical polishing, it can eliminate the influence of the cathode reaction and has a good effect.