Sheet Metal Bend Relief Guidelines

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

Sheet metal bend relief guidelines.

Sheet metal bending should be as perpendicular as possible to the direction of the metal fiber. When the sheet metal bend is parallel to the direction of the fiber of the metal material cracks are likely to occur at the bend of the sheet metal and the bending strength is low and it is easy to break as shown in the following figure. This is an example of dfm guidelines for sheetmetal fabrication. Minimum center to center distance between two holes in sheet.

Design for manufacturability sheet metal guidelines bends for the ease of manufacturing multiple bends on the same plane should occur in the same direction. Hole to form distance from hole to form to avoid hole distortion place holes no less than 2 5. Avoid large sheet metal parts with small bent flanges. If it is ok for the metal to rip the minimum bend relief is zero.

In low carbon steel sheet metal the minimum radius of a bend should be one half the material thickness or 0 80 mm. Minimum distance between hole slot edge to bend edge is recommended to avoid metal. Grain structure in the metal sheet is critical for avoiding cracks in sheet metal parts with lugs or tabs that are cut on. For the ease of manufacturing multiple bends on the same plane should occur in the same direction.

Bends that are in the same plane need to be designed in the same direction to avoid part re orientation to save both money and time. Bend relief provide bend relief along l shaped features width 2 t and depth t r edge bulging restrictive tolerances on v bends may result in edge bulging provide bend relief accordingly. Bend relief and collars near pierced areas strengthen sheet metal parts. To eliminate this a bend relief is added so the edge of the sheet metal is perpendicular to the bend.

Sheet metal design guidelines. Sheet metal bend brakes are used to bend material into the parts desired geometry. Avoid large sheet metal parts with small bent flanges. Bends should be toleranced plus or minus one half degree at a location adjacent to the bends.

Center to center distance between two holes.