Metal Bending Projects
Metal Fabrication Bending is a manufacturing process that produces a U-shape, V-shape, or channel shape along a straight axis in materials. Commonly used equipment includes box and pan brakes, brake presses, and other specialized machine presses. Typical products that are made like this are boxes such as electrical enclosures and manufacturing parts.
In press brake forming, a workpiece is positioned over the die block and the die block presses the sheet to form a shape. Usually bending has to overcome both tensile stresses and compressive stresses. When bending is done, the residual stresses cause the material to spring back towards its original position, so the sheet must be over-bent to achieve the proper bend angle. The amount of spring back is dependent on the material, and the type of form. When sheet metal is bent, it stretches in length. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend. The bend radius refers to the inside radius. The formed bend radius is dependent upon the dies used, the material properties, and the material thickness.
These factors are put into consideration whenever we do metal-bending jobs.
- The flat length of the sheet
- Bend allowance
- Bend deduction
- Inside bend radius
- Material thickness
- Distance from inside face to the neutral line
- The bend angle in degrees (the angle through which the material is bent)
Parts usually are lightweight with good mechanical properties. In other cases, some process variants are sensitive to variations in material properties. For instance, differences in spring-back have a direct influence on the resulting bend angle. To mitigate this, various methods for in-process control have been developed and we have calculations we use depending upon the type of material and bend radius.