There are many forms of stamping dies, which can generally be classified according to the following main characteristics: 1. According to the process nature, stamping dies are classified (1) to separate materials along closed or open contour lines. Such as blanking die, punching die, cutting die, cutting die, trimming die, cutting die, etc. (2) Bending the die makes the blank or other blanks bend and deform along a straight line (bending line), thus obtaining a die with a certain angle and shape. (3) Drawing die is a die that makes the blank of sheet metal into an open hollow part or further changes the shape and size of the hollow part. (4) The forming die is a die for directly copying and forming a blank or semi-finished workpiece according to the shapes of the male die and the female die, and the material itself only produces local plastic deformation. Such as expanding die, necking die, flaring die, wavy forming die, flanging die, shaping die, etc. 2. Classify (1) single process dies according to the degree of process combination. In one stroke of the printing machine, only one stamping process is completed. (2) The compound die has only one station, and in one stroke of the press, two or more stamping processes are completed at the same station at the same time. (3) The progressive die (also called the continuous die) has two or more stations in the feeding direction of the blank, and in one stroke of the press, two or more stamping processes are continuously completed at different stations. 3. According to the deformation characteristics of materials, typical die structures are classified: Figure 1. 1.2 is a single-process blanking die with guide posts and guide sleeves. It consists of an upper die and a lower die. The upper die consists of a die handle 5, an upper die holder 3, a guide sleeve 2, a punch 10, a backing plate 8, a fixing plate 7, a discharging plate 14, screws, pins and other parts. The lower die consists of lower die holder 17, guide post 1, female die1,guide plate 15, support plate 18, screws, pins and other parts. The upper die is installed on the slider of the press through the die handle 5, and moves up and down with the slider, so it is called the movable part. The lower die is fixed on the workbench of the press through the lower die seat, so it is also called a fixed part. Usually, the mold consists of two parts: one is the process part, which directly participates in the completion of the process and is in direct contact with the blank, including working parts, positioning parts, unloading parts and pressing parts. One kind is structural parts, which do not directly participate in the completion of the process, nor directly contact with the blank, but only play the role of ensuring the completion of the mold process, or improve the mold function, including guide parts, fasteners, standard parts and other parts, as shown in table 1. 1.3. It should be pointed out that not all stamping dies must have the above six parts, especially single-process dies, but the working part and the necessary fixed part are indispensable.