The metal plate is called sheet metal fabrication. For example, the use of sheets to make chimneys, iron buckets, oil tanks, ventilation pipes, elbow size heads, round places, funnel shapes, etc., the main process is shear, bending buckle edge, bending molding, welding, riveting, etc., need a certain geometric knowledge. Sheet metal parts are thin plate hardware, that is, can be processed by stamping, bending, stretching and other means of parts, a general definition is the thickness of the same parts in the process of processing. The corresponding is casting parts, forging parts, machining parts, and so on.

