Metal sheet metal processing is called sheet metal processing. For example, using sheet metal to make chimneys, iron barrels, oil tanks and kettles, ventilation pipes, large and small elbows, circular areas, funnel-shaped areas, etc. The main processes include cutting, bending, forming, welding, riveting, etc., which require a certain amount of geometric knowledge. Sheet metal parts are sheet metal hardware parts that can be processed through stamping, bending, stretching, and other methods. A general definition is a part whose thickness remains unchanged during the processing. Correspondingly, they are cast parts, forged parts, machined parts, etc.