What are the types of stamping and stretching process

The types of stamping process are as follows:
(1) According to the finished products, the stamping process can be roughly divided into separation process and forming process (bending, drawing, forming) according to the finished products.
(2) According to the temperature of stamping: according to the temperature of stamping, there are cold stamping and hot stamping. This depends on the strength, plasticity, thickness, deformation degree and equipment capacity of the material, and the original heat treatment state and final service condition of the material should be considered.
(2) According to the structure of stamping die: die is a tool to separate or deform sheet metal. It is composed of upper die and lower die. According to die structure, the process can be divided into simple stamping, continuous stamping and compound stamping.
The types of drawing process are as follows:
(1) Panel drawing process: the panel is a sheet metal stamping part with complex surface shape. In the drawing process, the blank deformation is complex, and its forming property is not simple drawing forming, but composite forming of drawing and bulging at the same time.
(2) Curved surface forming process: curved surface stretch forming makes the outer flange part of the metal plate blank shrink and the inner flange part elongates, which becomes a hollow stamping forming method with non straight wall and non flat bottom curved surface shape.
(3) Edge drawing process: the flange part of the product drawn in the previous process is re stretched, which requires good plasticity of the material.
(4) Deep drawing process: the drawing of workpieces beyond the limit of drawing processing needs more than two times of stretching. The products that have been drawn in the depth direction of the front station are re stretched in the depth direction.
(5) Thinning drawing process: different from normal drawing, thinning drawing is mainly to change the thickness of the drawing part wall during the drawing process. The gap between punch and die is less than the thickness of blank, and the straight wall of blank is under large uniform compressive stress when passing through the gap. When the wall thickness becomes thinner in the drawing process, the deviation of vessel wall thickness is eliminated, the smoothness of vessel surface is increased, and the precision and strength are improved.
(6) Reverse drawing process: reverse drawing is a kind of re stretching of the workpiece processed by drawing in the previous process. The reverse drawing method can increase the radial tensile stress, which can achieve good results in preventing wrinkling, and may also improve the tensile coefficient of re stretching.