Bend relief and collars near pierced areas strengthen sheet-metal parts. If the hole is near a bend, make sure the hole is outside of the bend radius. Product designs begin with CAD files and in order to get the sheet metal parts or products you desire; those CAD files should follow specific sheet metal design guidelines. Also known as press braking, flanging, die bending, folding and edging, this method is used to deform a material to an angular shape.. Bend relief refers to an indentation that designers should make on sheet metal designs so that the bending process is simple during manufacturing. Other components are often mounted or clamped to them. Existing components were FEM-analysed and Commonly used bends include V-bend, Z-bend offset bend and hemming bend etc.. Bending Height. The force must exceed the material’s yield strength to achieve a plastic deformation. Thereby forming a certain angle and curvature shape. Placing a bend too close to a hole for example can result in fractures or deformed pieces during the sheet metal fabrication . Sheet Metal Bend Radius. Hole spacing: Spacing between holes or between a hole and a boundary should be at least twice the sheet thickness. The problem definition included producing guidelines regarding the two manufacturing methods of sheet metal: bending and pressing. Grain structure in the metal sheet is critical for avoiding cracks in sheet-metal parts with lugs or tabs that are cut on three sides and bent in or out. ... from a single sheet of metal. As a general practice, relief is provided to the flange for ease of bending operation. Bend Relief. SHOW NAVIGATION << >> About Bend Relief Bend relief helps control the sheet metal material behavior and prevents unwanted deformation. 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. To eliminate this, a bend relief is added so the edge of the sheet metal is perpendicular to the bend. If it is OK for the metal to rip, the minimum bend relief is zero. The second important number when creating sheet metal designs is the bend radius value. The flange which does not have relief will result in a greater amount of distortion or tearing of the adjacent material. The minumum flange length is based on the die used to bend. Bending is a stamping process that uses pressure to force the material to plastically deform. This is done through the application of force on a workpiece. However for typical parts meant to be cost effective and easily produced the following tips should be useful. When sheet metal makes a transition from a bend to a flat surface, or to another bend, it tends to tear depending on the geometry of the boundary. 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. In general, a minimum bend relief is equal to the material thickness plus the inside bend radius. Bending is one of the most common sheet metal fabrication operations. A section view of a typical punch and die set used to create sheet metal bends. For example, an unrelieved bend might not represent the accurate, real life model you need due to material stretching. Sheet-metal brakes bend sheets into a part’s desired geometry. Bends are the most typical feature of sheet metal parts and can be formed by a variety of methods and machines which negate the absolute need for some of the below tips. The bend radius of a sheet metal design will be based on the wall thickness of the part and the tooling that is available in house. Makes bend easier to produce, Eliminates burrs and sharp points, Bend Relief. Benefits of Bend Relief. 5 Basic Factors in Sheet Metal Design for Manufacturability 1. The guidelines were designed to aid, mainly novice, design engineers in early stages of component development. One benefit of a bend relief is that it makes the part easier to produce. Below are some tips and guidelines for designing sheet-metal parts. Bends. Figure 2.
2020 sheet metal bend relief guidelines