Design Rules For Sheet Metal Stamping

Because sheet metal parts are manufactured from a single sheet of metal the part must maintain a uniform wall thickness.

Design rules for sheet metal stamping. 2 the objects of stamping processing are all sheets so it is also called sheet metal stamping. Stamping design guidelines jonathan zhang 2 stamping design guideline stamping includes a variety of sheet metal forming manufacturing processes using a machine press or stamping press the processes including punching blanking embossing bending forming drawing flanging and coining. It needs three elements. Why manufacturing and component design teams don t collaborate on each job is inexplicable.

Punch equipment mold and raw materials. 3 stamping is done by equipment and molds. The drawbar radius should be a minimum of 20 millimeters. The die radius should be nine times the sheet thickness along the straight sides and nine to 12 times the sheet thickness in the corners.

The rule of thumb in stamping design is to leave a minimum of 1 1 2 times material thickness between trimmed or perforated features. In a sheet metal design specifying hole sizes locations and their alignment is critical. 1 stamping is carried out at room temperature that is it does not require heating so it is called cold stamping. When the metal sheet folded or bent the metal around the bend is deformed and stretched.

Since the sheet metal has thickness of 019 inches there must be a gap between the two dies that allows the sheet metal to fit during the stamping process. The bend allowance is defined as the added length to the actual leg lengths of the part in order to develop a flat pattern. When the manufacturing team and component design team work together the result is the best design for manufacturing and sometimes a component stamping cost savings of as much as 50 percent. It is always better to specify hole diameters that are greater than the sheet s thickness t.

Also the stretching and compression of forming can distort holes adjacent to a form or bend. Holes are best kept at least 2 times material thickness beyond the radius of a formed feature. As this happens it gains a small amount of total length in the stamped part. Sheet metal parts with a minimum of 0 9mm to 20mm in thickness can be manufactured.

While it would be possible to include this offset in my 3d models i decided to incorporate it later on in the process. Extrude hole size position guidelines creating an extruded hole using a punching process requires extreme pressure force. When designing parts for laser cutting one should not make holes smaller than the thickness of the material. Relief height is generally kept greater than two times of sheet thickness plus bend radius.