The concepts mentioned above are all books. In actual production, drawing refers to the process of first drawing and then trimming, with blank holder, so that the sheet metal flows fully and is not easy to wrinkle, and it is used for large-scale panels after drawing, while forming refers to the process of first trimming and then drawing, which is calculated according to the shape of the part, and then blanking and drawing. This has the advantage of saving materials, but it is easy to wrinkle and is generally used for thick materials. . .