The basic principle of deep drawing die
Deep drawing is a cold stamping process that uses a die to draw a flat blank or a semi-finished blank into an open hollow part.
The shapes of the products that can be made by the deep drawing process are: cylindrical, doorway, spherical, conical, rectangular and other various irregular opening hollow parts.
Combining the deep drawing process with other stamping processes can produce parts with complex shapes, such as the blanking and deep drawing composite die that combines the blanking process and the deep drawing process.
The common deep drawing products in daily life are:
Rotary parts: such as enamel washbasin, aluminum pot.
Square parts: such as lunch boxes, automobile fuel tanks
Complex parts: such as automotive panels.
Drawing die structure
The thinning and deep drawing die thinning and deep drawing is different from the general deep drawing. The diameter of the workpiece changes little during the thinning and deep drawing, and the thickness of the bottom of the workpiece basically does not change, but the side wall thickness of the workpiece is thinned during the deep drawing, and the height of the workpiece is corresponding Increase. For the form of the thinning and deep drawing die, see
Drawing die structure
1. Mold for the first deep drawing process (Table 1)
2. Dies for the subsequent deep drawing process (Table 2)
3. The reverse drawing die draws the process parts in the opposite direction of the previous process, which is called reverse drawing. Reverse drawing turns the inner wall of the process part outward, the contact surface between the process part and the die is large, and the material flow resistance is also large, so the binder ring is not needed. Figure 1 is an example of reverse deep drawing. Figure 2 shows the reverse drawing die. The outer diameter of the die is smaller than the inner diameter of the process part, so the drawing coefficient of the reverse drawing should not be too large. If it is too large, the wall thickness of the die will be too thin and the strength will be insufficient.
4. Thinning drawing die thinning drawing is different from general drawing
, the diameter of the workpiece changes little during thinning and deep drawing, and the thickness of the bottom of the workpiece basically does not change, but the side wall thickness of the workpiece is thinned during deep drawing, and the height of the workpiece increases accordingly. The form of the thinning and deep drawing die is shown in Table 3. The form of the thinning and deep drawing punch is shown in Table 4.
Figure 3 shows the thinning and deep drawing die. When the punch punches down, it passes through the concave die (two pieces) to perform secondary thinning and deep drawing on the blank. Remove from the mold.
TAGS: structure form design thinning
