What are the types of drawing process

(1) Panel stretching 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 technology
The outer flange part of the metal plate blank is reduced and the inner flange part is elongated by curved surface stretch forming, which becomes a hollow stamping method with curved surface shape of non straight wall and non flat bottom.
(3) Edge drawing process
The flange of the products drawn in the previous process is processed by angular re drawing, which requires good plasticity of the material.
(4) Deep drawing process
The drawing workpiece 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 cylinder wall in 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
It is a kind of re stretching that the workpiece processed by drawing in the previous process is reverse stretched. 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.