Sheet Metal Bend Relief Guidelines

Sheet metal design guidelines.

Sheet metal bend relief guidelines.

Grain structure in the metal sheet is critical for avoiding cracks in sheet metal parts with lugs or tabs that are cut on. Minimum distance between hole slot edge to bend edge is recommended to avoid metal. For the ease of manufacturing multiple bends on the same plane should occur in the same direction. Avoid large sheet metal parts with small bent flanges.

In low carbon steel sheet metal the minimum radius of a bend should be one half the material thickness or 0 80 mm. In general a minimum bend relief is equal to the material thickness plus the inside bend radius. Sheet metal bend brakes are used to bend material into the parts desired geometry. If it is ok for the metal to rip the minimum bend relief is zero.

How to design good sheet metal parts hole slot distance from bend edge. Center to center distance between two holes. Design for manufacturability sheet metal guidelines bends for the ease of manufacturing multiple bends on the same plane should occur in the same direction. Bend relief and collars near pierced areas strengthen sheet metal parts.

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. 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. Avoid large sheet metal parts with small bent flanges. One benefit of a bend relief is that it makes the part easier to produce.

Keeping the bend radius consistent will also make parts more cost effective. Minimum center to center distance between two holes in sheet. Hole to form distance from hole to form to avoid hole distortion place holes no less than 2 5. 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.

Sheet metal bending should be as perpendicular as possible to the direction of the metal fiber.