Sheet Metal Bend Relief Guidelines

Sheet metal parts with a minimum of 0 9mm to 20mm in thickness can be manufactured.

Sheet metal bend relief guidelines.

When the radius is less than recommended this can cause material flow problems in soft material and fracturing in hard material. Geometry of tooling imposes a minimum bend dimension. Therefore exceptions can be there for complex features design. Bends in sheet metal are manufactured using sheet metal brakes.

Bending is a stamping process that uses pressure to force the material to plastically deform. Bend radius as a rule inside bend radius should be equal to material thickness. Commonly used bends include v bend z bend offset bend and hemming bend etc. This helps in delivering the product at low cost and faster timelines.

Thereby forming a certain angle and curvature shape. Grain structure in the metal sheet is critical for avoiding cracks in sheet metal parts with lugs or tabs that are cut on. The flange which does not have relief will result in a greater amount of distortion or tearing of the adjacent material. Bends should be toleranced plus or minus one half degree at a location adjacent to the bends.

When designing parts for laser cutting one should not make holes smaller than the thickness of the material. As per sheet metal design thumb rules the depth of bend relief should be greater than or equal to the inside bend radius of the bend and the width of the bend relief should be the same as the sheet metal thickness or more. For the ease of manufacturing multiple bends on the same plane should occur in the same direction. The diagram shows one such mechanism.

Continuing our focus on sheet metal forming this issue of dfm guidebook focuses on design guidelines for bend relief parameters distance between holes and bends and offset bend material when a bend is made close to an edge. Following all sheet metal design guidelines is very difficult in the complex part. In low carbon steel sheet metal the minimum radius of a bend should be one half the material thickness or 0 80 mm. Sheet metal design guidelines are followed to design quality sheet metal enclosures.

Avoid large sheet metal parts with small bent flanges. Bend relief when a bend is made close to an edge the material may tear unless bend relief is given. Use the minimum bend dimension values in the charts below for your minimum closeness of cutout to a bend. The sheet metal bending height should be at least 2 times the thickness of the sheet metal plus the bending radius that is h 2t r.

Bend relief and collars near pierced areas strengthen sheet metal parts. If you design sheet metal parts you may know that bend relief is a notch cut made into the. Refer to the chart for values for folder as well as various press brake tooling combinations. A 1 degree tolerance on all bend angles.

Design for manufacturability sheet metal guidelines bends for the ease of manufacturing multiple bends on the same plane should occur in the same direction.