Stamping process can be divided into separation process and forming process (bending, drawing and forming). The separation process is to separate the stamping part from the blank along a certain contour line in the stamping process, and the quality of the separation section of the stamping part should also meet certain requirements; the forming process is to make the stamping blank produce plastic deformation without damage, and transform it into the required shape of the finished product, and also meet the requirements of dimensional tolerance.

According to the stamping temperature, there are cold stamping and hot stamping. It depends on the strength, plasticity, thickness, deformation degree and equipment capacity of the material. At the same time, the original heat treatment state and final use conditions of the material should be considered.

1. Cold stamping metal processing at room temperature, generally applicable to the thickness of less than 4mm billet. The utility model has the advantages of no heating, no oxygen skin, good surface quality, convenient operation and low cost. The disadvantage is that there is work hardening phenomenon, which makes the metal lose the ability of further deformation. Cold stamping requires uniform thickness and small fluctuation range of blank, smooth surface, no spot, no scratch, etc.

2. Hot stamping the metal to a certain temperature range of stamping processing method. The advantages are that the internal stress can be eliminated, the work hardening can be avoided, the plasticity of the material can be increased, the deformation resistance can be reduced, and the power consumption of the equipment can be reduced. (source: China Machinery Network)

1. Die structure: die is a tool to separate or deform sheet metal. A typical die structure is shown in Figure 3 & mdash; 17, which is composed of upper die and lower die. The handle of the upper die is fixed on the sliding block of the press, and moves up and down with the sliding block, while the lower die is fixed on the worktable of the press.

Punch and die are the working parts in the die which deform or separate the blank. They are fixed on the upper template and the lower template respectively by pressing plate. The upper and lower templates are respectively equipped with guide sleeves and guide pillars to guide the punch and die alignment. The guide plate and the positioning pin are used to control the feeding direction and length of the blank respectively. The function of the discharge plate is to make the workpiece or blank come out of the punch after stamping.

2. Classification of die

Stamping die is indispensable in stamping production. Stamping die can be divided into simple die, continuous die and compound die.

(1) Simple die simple die is a die that only completes one process in one stroke of the punch. Figure 3 & mdash; 17 is a simple die for blanking or punching, and the assembly diagram of the simple die is shown in Figure 3-18. When working, the strip is fed along the two guide plates 9 on the die until it touches the locating pin 10. When the punch is pressed down, the parts (or scraps) will go into the hole of the die, and the strip will clamp the punch and move up with the punch. When the strip touches the discharge plate 8 (fixed on the die), it is pushed down so that the strip continues to feed between the guides. Repeat the above action and rush down the second part.

(2) In one stroke of a continuous punch press, a die that completes several stamping processes at different parts of the die at the same time is called a continuous die, as shown in Figure 3 & mdash; 19. When working, the positioning pin 2 is aligned with the pre punched positioning hole, the upper die moves downward, the punch 1 is used for blanking, and the punch 4 is used for punching. When the upper die returns, the discharge plate 6 pushes the waste from the punch. At this time, feed the blank 7 forward and perform the second blanking. The feeding distance is controlled by the stop pin.

(3) A compound die, which completes several stamping processes at the same part of the die in one stroke, is called a compound die, as shown in Figure 3 & mdash; 20. The most important feature of the compound die is that there is a male and female die 1 in the die. The outer circle of the punch is the cutting edge of the blanking punch, and the inner hole is the drawing die. When the slider moves downward with the punch, the strip first falls in punch 1 and blanking die 4. The blanking part is supported by the drawing punch 2 in the lower die. When the slider continues to move downward, the die moves downward to carry out drawing. The ejector 5 and the discharger 3 push the drawing part 9 out of the die in the return stroke of the slider. Compound die is suitable for stamping parts with large output and high precision.