Bend Sheet Metal More Than 90 Degrees

Geometry of tooling imposes a minimum bend dimension.

Bend sheet metal more than 90 degrees.

The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. Also wiping die employed in edge bending must have a pressure pad. 0 017453 x 90 x 0 020 0 33 x 0 024 0 0438558984 inch bend allowance. In fact press brakes are more flexible and can bend certain parts that the folder just cannot do.

For instance 0 062 in thick cold rolled steel will bottom once the punch nose is 0 074 to 0 078 in. However if folder radii do not work for you we can manufacture parts using our press brakes. The bend attains 90 degrees at a point in the die space that s about 20 percent the material thickness as measured from the bottom of the v die. With this free online tool we quickly get the sheet metal bend deduction and therefore the sheet metal blank initial flat length from the finished part measurements.

Figure 1 however keep in mind that this design works best for bends that have an inside bend radius that is equal to or less than 1x metal thickness. To achieve a 90 degree bend you must overbend the material past the desired bend angle and allow it to return to the desired shape with the springback. You only have to insert interior angle flange lengths k factor inside radius and material thickness. Bending a brittle metal beyond its limits could cause the metal to snap and break.

From there we can calculate the k factor and the bend deduction. We will start by calculating the bend allowance. This helps greatly with such common angles as springback is not a problem any more. The diagram shows one such mechanism.

Edge bending gives a good mechanical advantage when forming a bend. Keep in mind that some metals are more brittle than others. 90 degrees bend angle. The most common method is with 2 rolls but there are also options with one roll.

For bend angles larger than 90 and generally when a and b are dimensioned from the tangent of the bend to the edge the outside setback is independent from the bend angle. Rotary benders can also bend sharper corners than 90 degrees. However angles greater than 90 degrees will require more complex equipment capable of some horizontal force delivery. Therefore the bend allowance added to the flange lengths is equal to the total flat.

After bending the sheet we need to do some measurements as shown in figure 2. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. Cells on the right will output the desired values. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.