Sheet Metal Form Relief

In general a minimum bend relief is equal to the material thickness plus the inside bend radius.

Sheet metal form relief. Corner relief feature maintains the form and size of this cut. For example if you make a partial flange as above using all the defaults the software makes relief cuts at the end of the bends as shown to the right. When sheet metal makes a transition from a bend to a flat surface or to another bend it tends to rip and tear. The distance d is determined by the following equation.

If you move the flange to the inside of the part the. To eliminate this a bend relief is added so the edge of the sheet metal is perpendicular to the bend. This cut is needed to prevent unwanted material deformation during bending of the sheet metal part. 3d cad files are converted into machine code which controls a machine to precisely cut and form the sheets into the final part.

The distance d represents the width of the rectangular or obround relief cut and the depth by which the side of the rectangular or obround relief cut extends past the bend region. Grain structure in the metal sheet is critical for avoiding cracks in sheet metal parts with lugs or tabs that are cut on. Bend relief and collars near pierced areas strengthen sheet metal parts. D relief ratio part thickness the bend region is represented by the dark gray area of the diagram.