What are the types of metal stamping and drawing parts?
stamping equipment is used for drawing and forming of products, including drawing, redrawing, reverse drawing and thinning.
Drawing processing: Using the platen device and the punching force of the punch, part or all of the flat plate is pulled into the cavity of the female die to form a bottomed container. The sidewall of the container is processed parallel to the drawing direction, and the deep drawing processing of conical (or pyramidal) containers, hemispherical containers, and parabolic containers also includes expansion processing.
Re-drawing: For deep-drawn products that cannot be completed by one-time drawing, the formed product needs to be re-drawn to increase the depth of the formed container.
Reverse drawing processing: The drawing workpiece of the previous process is reversely drawn, and the inner side of the workpiece becomes the outer side, making its outer diameter smaller.
Thinning and drawing processing: The forming container is squeezed into the concave mold cavity slightly smaller than the outer diameter of the container through the punching machine, so that the outer diameter of the bottomed container is smaller and the wall thickness is thinner, which not only eliminates the wall thickness deviation, but also makes the container surface smooth. .
1. Cylinder drawing
Drawing of cylindrical products with flanges (flanges). The flange and the bottom are both plane shapes, the side wall of the cylinder is axisymmetric, the deformation is evenly distributed on the same circumference, and the blank on the flange is deep-drawing deformation.
2. Elliptical drawing process
The deformation of the blank on the flange is tensile deformation, but the deformation amount and deformation ratio change correspondingly along the contour shape. The greater the curvature, the greater the plastic deformation of the blank; conversely, the smaller the curvature, the smaller the plastic deformation of the blank.
3. Rectangular drawing process
A low rectangular piece formed by one stretch. During stretching, the tensile resistance at the rounded corners of the flange deformation zone is greater than that at the straight edge, and the degree of deformation at the rounded corner is greater than that at the straight edge.
4. Yamagata drawing process
When the side wall of the stamping part is inclined, the side wall is suspended during the stamping process, and the mold is not attached until the end of forming. The deformation characteristics of different parts of the sidewall during the forming process are not exactly the same.