The induction and summary of the process theory of sheet metal parts help to improve the ability of the craftsmen to apply Sheet Metal Processing, and is conducive to designing a more optimized process flow and processing plan. Under the premise that the existing equipment processing capacity and product structure are basically finalized, it is the main responsibility of the sheet metal craftsmen to optimize the structure from the process point of view, based on the dynamic balance and flexible coordination of production, and formulate the optimal process method. Sheet metal parts have the characteristics of their own thin and easy to shape, and can be formed into various shapes of parts. With the application of welding, assembly, riveting and other processes, the possibility of multi-structure of the product is given. At the same time, these characteristics also make the sheet metal parts more or less deformed during processing. These deformations make the size or shape of the entire component change, causing quality problems. However, the production process of sheet metal parts has its inherent laws. For the same type of products, according to the existing equipment, manpower, etc., the processing sequence can be flexibly adjusted to give a reasonable processing technology. Therefore, choosing the correct process route is an effective measure to prevent and solve this type of problem. The formulation of the process route must combine the shape of the product and the existing processing equipment of the company, in order to meet the product quality requirements as the premise, and ultimately maximize the economic benefits. The formulation of the general process route can follow the following principles: meet the product quality requirements; the product process route is economical; provide optimization for subsequent processes; and facilitate processing. Technicians‘ consideration of quality comes from the grasp of the functionality and appearance of the product structure, as well as the proficiency in the processing capacity of the equipment. Considering the cumulative error matching relationship of the whole machine, optimizing the product processing method to reduce the processing difficulty, and setting a relatively stable process route during mass production are the three directions to be considered in the process preparation. The cumulative error matching is a comprehensive reflection of the cumulative tolerance of the product itself in the assembly. During the process analysis, the corresponding tolerance distribution should be made to ensure that the cumulative error is within the controllable range. The optimization of the processing method lies in the adjustment of the processing sequence or the improvement of the process. The general process plan is: the shape of the cutting machine blanking punch and the four corners of the inner hole folding machine bending and welding. Such a process plan saves time and effort, but if mass production hedges the damage of the bed tool will be exacerbated, greatly increasing the maintenance cost of the machine tool. In addition, if there is a slight problem with the programming program, it will cause irreparable losses. The processing technology of sheet metal parts is a more complex issue. The basic principles of general sheet metal parts process setting are to find out the basic method of process setting. In short, as an engineer, you should establish a cost concept, integrate costs into the process, and look at the process of process setting from an overall perspective.