Die casting and polishing process: mechanical polishing: refers to the use of physical methods, such as cutting, grinding, the surface plastic deformation occurs, the surface of the convex part fill concave part, so as to reduce and smooth the surface roughness, improve the surface roughness. Mechanical polishing and lead to the destruction of the metal surface crystal and metamorphism, produce plastic deformation layer, microstructure change due to local heating. Electrolytic polishing, electrolytic polishing is the use of chemical reaction in DIN screw plug electrolytic polishing for anode, insoluble metal cathode immersed in the electrolytic cell. By direct current (dc), dissolving anode oxidation, the oxidation of the surface to disappear, restore luster. Chemical polishing, chemical polishing is the chemical etching under special conditions. It is to control the dissolution of surface, the surface micro convex part of the preferential dissolution, so as to achieve the purpose of the surface smooth and bright.
Why there are spots when die casting and polishing? It may be a silica or the formation of oxidation. The solution is simple, with fresh ones. From the mold release agent. Perhaps, we spray too much mold release agent. Release agent of organic Magnetic Drain Plug matter content is too high. Under the hot melt temperature, reduction of some of these organic carbon, others become organic polymer. A mixture of these carbon molecules and polymers, formed in the casting, is included in the surface layer, namely we see in the dark.
Die casting refers to the pure or alloy by casting equipment and devices. Is generally will be heated to a liquid or alloy with sand mold and metal mold casting into the cavity, get all sorts of shapes and sizes of car radiator cap parts or metal parts, commonly known as die casting.