Sheet Metal Bend Relief

To eliminate this a bend relief is added so the edge of the sheet metal is perpendicular to the bend.

Sheet metal bend relief.

To create a relief locally you can select one or two hard edges one or two bends or a bend and a hard edge. The selected items can be a 3d solid with sheet metal features a face or a hard edge of the solid. Grain structure in the metal sheet is critical for avoiding cracks in sheet metal parts with lugs or tabs that are cut on. If a 3d solid is selected the command recognizes the places where corner or bend reliefs are needed and creates them automatically.

Extrude hole size position guidelines. Use the minimum bend dimension values in the charts below for your minimum closeness of cutout to a bend. In general a minimum bend relief is equal to the material thickness plus the inside bend radius. Though bend relief lengths and widths vary between projects they all share a common goal.

Avoid large sheet metal parts with small bent flanges. Bend relief synchronous sheet metal is pretty cool even cooler than just normal synchronous modeling if you ll excuse that word. Keeping the bend radius consistent will also make parts more cost effective. Bend relief in sheet metal bend bend relief is provided at the end of bending edge in sheet metal design to avoid any crack tearing in the corner.

Sheet metal bend brakes are used to bend material into the parts desired geometry. 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. In low carbon steel sheet metal the minimum radius of a bend should be one half the material thickness or 0 80 mm 0 03 inch whichever is larger. 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.

Refer to the chart for values for folder as well as various press brake tooling combinations. In sheet metal a bend relief is an incision cut along the sides of a planned bend. When sheet metal makes a transition from a bend to a flat surface or to another bend it tends to rip and tear. Bend relief and collars near pierced areas strengthen sheet metal parts.

The diagram shows one such mechanism. Bends specified as angles may be toleranced at plus or minus one half degree at a location adjacent to the bends. 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. Geometry of tooling imposes a minimum bend dimension.