Drawing coefficient refers to the ratio of the workpiece diameter after drawing to the workpiece diameter before drawing. The minimum tensile coefficient of ultimate tension.

Factors: mechanical properties of materials; The relative thickness of the blank; Geometric parameters of drawing die; Drawing conditions.

Deep drawing is a cold stamping process that draws a flat blank or semi-finished blank into an open hollow part by using a die. The product shapes that can be made by deep drawing process are: cylindrical, door-shaped, spherical, conical, rectangular and other irregular open hollow parts.

The drawing process can be combined with other stamping processes to manufacture parts with complex shapes, such as blanking and drawing compound dies.

Common deep-drawing products in daily life are: rotating parts, such as enamel washbasin and aluminum pot. Square parts: such as lunch boxes and car fuel tanks. Complex parts: such as automobile panels.

Extended data

Analysis of coordinate grid test method. During deep drawing, the blank of the middle plate is first pressed by the blank holder, and the punch goes down, forcing the material (flange part) below the blank holder to plastically deform and flow into the gap between the punch and the die to form a cylindrical side wall. Observing the grid after deep drawing, it is found that the bottom grid remains basically unchanged and the pipe wall changes greatly.

1, concentric circles with equal original compartments form circumferential lines with equal length and increased spacing, and the closer to the cylinder mouth, the greater the spacing. 2. The original equally-graded radiation lines become equally-spaced vertical parallel lines.

2, the original index is equal to radiate into vertical parallel lines, and the spacing is equal.

3. The flange material undergoes radial elongation deformation and tangential compression deformation.

Summary: The deformation of deep drawing materials mainly occurs in the flange part, and the process of deep drawing deformation is essentially a process in which the material at the flange is plastically deformed under the action of radial tensile stress and tangential compressive stress, and the flange is continuously shrunk and transformed into the cylinder wall, and this deformation degree is the largest at the outermost edge of the flange.