The unfolded sheet metal work piece is a plan view (2D) based on the part drawing (3D). The following editor will introduce the precautions of the sheet metal work piece in detail. 1. The unfolding method should be suitable to facilitate the saving of materials and processability. The unfolded drawing of the sheet metal processing part is a plan view (2D) based on the part drawing (3D). The following editor will introduce the precautions of the sheet metal processing part in detail. 1. The unfolding method should be suitable, and it should be convenient to save materials and processability