Use covering: Etching is widely used in all integrated circuit lead frame and other fields, e.g. fluorescent display screen, guard net, precise filter, encoder raster, micro-electrode, mask plate, integrated circuit cover, kinescope shade mask, SMT, tin-paste net press plate. Technical advantage: 1. The technology of etching changes the traditional ways of matching the metal parts by using of lathe and pressing; 2. Etching can be used in machining full range of plane parts of metal, alloy, stainless steel, from the micro-filter screen of big area used in conventional industry to the micro-part almost invisible to human’s eyes; 3. It can machine the concavo-convex metal products according to the drawing like character, figure, complicated circularity, design, etc; 4. Etching can also be used in all kinds of perforated parts of close arbitrary form.