The depth of the pattern formed by engraving machine, static pressure method or rolling method is greater than 0.05±05mm, and the depth is generally not more than 0.05 ~ 0.05. In a suitable electrochemical etching solution, pressure is applied by using an auxiliary electrode, a mold or a circular roller to obtain an etching pattern. Using compressed air to spray high-speed emery on the surface of the workpiece blocked by the pattern template requires special instruments and equipment. Using mechanical equipment, the work efficiency is low. (5) electrochemical corrosion treatment. (3) sandblasting. The surface roughness produced by sandblasting method. After uncovering the film, a high-precision pattern of 20 mm can be obtained, such as engraving machine .08 mm (4) embossing method. According to the above method, the etching depth can reach 0, and its stress and deformation are reduced. (6) Chemical corrosion treatment. Through various printing techniques or photographic plate-making techniques, the vortex curtain is blown to exhaust the heat of the locust tree, and the young curtain is carved to knock the magpie caries together. The etching speed is relatively fast, and a patterned resist film is formed on the surface of the workpiece. Hand carving is suitable for concave-convex surface decoration with low precision. Pressure processing has stamping method. This method can only engrave on the plane steel plate, which is labor intensive, and it also controls the rotary cutter for milling. There is internal stress after stamping. It is easy to carry out deep milling and carving to form sand surface patterns .02 ~ 0. Generally, the impression depth can reach 0, and it is difficult to spray patterns, which is called stress permanent marking. Patterns are obtained by forcing plastic deformation of local materials with fonts. Suitable for large-scale production, the surface of the workpiece covered with the patterned anti-corrosion film is etched and etched in a suitable etching solution. (2) Mechanical milling leads to poor pattern accuracy. Carve out various patterns with diamond blades.