Etching method of metal sign: that is, a technological method to process metal parts through photochemical reaction and etching. The etching method of metal signboard makes full use of the current advanced computer-aided design technology to make the pattern to be processed into a thin film, and then copies the thin film pattern to the surface of metal material through photochemical reaction to form a protected metal part pattern on the surface of metal material, and then etches the unprotected metal material to produce metal parts. Compared with the traditional mechanical punching method, the etching method of metal signs has the advantages of short production cycle (generally, products can be manufactured in three days) and convenient and quick size modification; Mechanical stamping method must have high-precision stamping equipment and die processing equipment, and the development cycle needs 2 to 3 months. Due to the particularity of etching method, the complexity of parts has nothing to do with machining difficulty; Relatively speaking, mechanical punching often increases the manufacturing difficulty when dealing with complex parts, and some of them can't even be processed. Etching method only needs to design and manufacture thin films (photosensitive glue, etc.). ), and the new product development cost is low; The metal parts manufactured by etching method have no burr, do not change the magnetic characteristics of the material, and the flatness of the products after marking treatment has not changed at all. Etching method is suitable for processing large-batch, multi-variety and large-plane thin metal materials and surface decoration (semi-corrosion) of metal products, and acrylic is also suitable for single-piece and small-batch proofing. Now it is applied to various integrated circuit lead frames and fluorescent display screen arrays, grids, precision filters, encoder gratings, microelectrodes, mask plates, integrated circuit cover plates, kinescope shadow masks, surface mount (SMT) solder paste screen printing plates and other products. With the improvement of the etching process, the improvement of design level and the update of process equipment, the precision of etched products will reach a higher level and the application market will be broader.