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Sheet metal shell design should have good use and necessary protective facilities, so that the equipment is easy to operate, install and repair, and use it safely and reliable. For example, in the design of the sheet metal shell of the machine, its structure and layout should be reasonable. The overall design should conform to ergonomics, human -computer interaction design humane, fully consider various safety hazards, and ensure that the equipment operation is safe, reliable, and comfortable. Furthermore, sheet metal shells should be convenient for production, assembly, debugging and packaging. Generally speaking, the six steps of sheet metal shell processing are: drawing design, laser processing or (CNC stamping), bending, welding molding, electrostatic powder or (liquid paint), packaging shipment. In the design of sheet metal shells, the effects of material process, processing process, and production costs should be examined, so that the design meets the process requirements, the structure assembly is easy, the product is easy to debug and packaged, and the feasibility, practicality and economy of design drawings are guaranteed sex.