Design Rules For Sheet Metal Stamping

The rule of thumb in stamping design is to leave a minimum of 1 1 2 times material thickness between trimmed or perforated features.

Design rules for sheet metal stamping.

When designing parts for laser cutting one should not make holes smaller than the thickness of the material. Punch equipment mold and raw materials. 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. Relief height is generally kept greater than two times of sheet thickness plus bend radius.

The drawbar radius should be a minimum of 20 millimeters. While it would be possible to include this offset in my 3d models i decided to incorporate it later on in the process. 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. When the metal sheet folded or bent the metal around the bend is deformed and stretched.

Also the stretching and compression of forming can distort holes adjacent to a form or bend. 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. Because sheet metal parts are manufactured from a single sheet of metal the part must maintain a uniform wall thickness. 3 stamping is done by equipment and molds.

Sheet metal parts with a minimum of 0 9mm to 20mm in thickness can be manufactured. 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. The bend allowance is defined as the added length to the actual leg lengths of the part in order to develop a flat pattern. As this happens it gains a small amount of total length in the stamped part.

Holes are best kept at least 2 times material thickness beyond the radius of a formed feature. Extrude hole size position guidelines creating an extruded hole using a punching process requires extreme pressure force. Why manufacturing and component design teams don t collaborate on each job is inexplicable. It is always better to specify hole diameters that are greater than the sheet s thickness t.

Bend relief is provided at the end of bending edge in sheet metal design to avoid any crack tearing in the corner. This could be a single stage operation where every. It needs three elements. A distance of 16 to 20 millimeters from the draw bead usually is sufficient for aluminum stampings.