During the bending of sheet metal material around the bend tends to stretch and deform.
Sheet metal bend relief cut.
A 1 degree tolerance on all bend angles.
D relief ratio part thickness the bend region is represented by the dark gray area of the diagram.
The value of the relief ratio must be between 0 05 and 2 0.
4 forming near holes when a bend is made too close to a hole the hole may become deformed.
The distance d is determined by the following equation.
You are also able to select to extend the bend relief in the opposite direction in the case of a flange for example illustrations below.
Preventing tearing and part deformation during the bending process.
Bends in sheet metal are manufactured using sheet metal brakes.
In general a minimum bend relief is equal to the material thickness plus the inside bend radius.
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Choose the relief type in the sheet metal relief menu.
If it is ok for the metal to rip the minimum bend relief is zero.
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The width of the relief should be a material thickness or greater preferably a material thickness 1 64.
Click a tool button on the sm relief toolbar.
Click the relief drop down button in sheet metal modify panel on the ribbon and select a relief type.
One benefit of a bend relief is that it makes the part easier to produce.
The bigger the bend relief the easier it is to align over the end of the tooling.
Though bend relief lengths and widths vary between projects they all share a common goal.
When designing parts for laser cutting one should not make holes smaller than the thickness of the material.
To choose the desired relief type do one of the following.
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To eliminate this a bend relief is added so the edge of the sheet metal is perpendicular to the bend.
Sheet metal parts with a minimum of 0 9mm to 20mm in thickness can be manufactured.
The higher the value the larger the size of the relief cut added during insertion of bends.
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Figure c shows a bend relief cut into the part again the depth of the relief should be greater than the radius of the bend.
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.
