Sheet metal chassis is the key protective structure of the equipment, sheet metal chassis assembly with more parts, standard parts of complex types, different structures and other characteristics, at present also more manual visual inspection method Jinze assembly quality, it is difficult to meet the needs of high-volume industrial production testing. Therefore, to realize the quality evaluation of the assembly of standard parts of sheet metal chassis, pattern recognition is the key.

Image classification is based on the observation and learning of known samples, to achieve the prediction of unknown samples, in the process of sheet metal chassis assembly quality inspection, the whole process with the participation of technical personnel, is very suitable for the use of image classification pattern recognition method to achieve.

According to the above mentioned contents, we assemble the sheet metal chassis assembly process according to the standard parts and components in accordance with the specified technical requirements, after debugging and inspection to make it a qualified product. Each assembly position on the sheet metal chassis should be assembled on the standard parts of the model, appearance, etc. have prescribed technical requirements. There are different standard parts on the sheet metal chassis, in the process of quality inspection, the assembly test results of each assembly position can be summarized as correct assembly, misassembly and leakage of assembly in these three cases. Among them (1) correct assembly refers to the assembly position, can be assembled in accordance with the technical requirements of the correct sheet metal chassis standard parts; (2) mis-assembly refers to the assembly position, the assembled sheet metal chassis standard parts type is incorrect or the quality of the assembly is unqualified; (3) leakage of the assembly refers to the assembly position, not loaded on the correct sheet metal chassis standard parts.

Sheet metal parts is sheet metal processed products, we live everywhere can not be separated from the sheet metal parts. Sheet metal parts are made by filament power winding, laser cutting, heavy-duty machining, metal bonding, metal drawing, plasma cutting, precision welding, roll forming, sheet metal bending, die forging, water jet cutting.

A foreign professional journal of a definition of sheet metal can be defined as: sheet metal is for sheet metal (usually below 6mm) a comprehensive cold process, including shearing, punching/cutting/compounding, folding, welding, riveting, splicing, molding (such as car body) and so on. Its distinctive feature is the consistent thickness of the same part.

Sheet metal characteristics edit
Sheet metal parts are characterized by light weight, high strength, conductivity (able to be used for electromagnetic shielding), low cost, and good performance in mass production, etc. They are widely used in the fields of electronics and electrical appliances, communications, automotive industry, and medical devices, for example, sheet metal parts are an essential part of the computer chassis, cell phones, and MP3s.

As the application of sheet metal is becoming more and more widespread, the design of sheet metal parts has become a very important part of the product development process, mechanical engineers must be skilled in the design of sheet metal parts, making the design of the sheet metal to meet the functionality of the product and the appearance of the requirements of the product, but also to make the stamping die manufacturing is simple and low-cost.