Bend length 0 010 0 25mm.
Dimensioning sheet metal bends.
Upon close examination of the bends we find that the sheet metal stretches on the outer surface and that the inside surface seems to shrink.
Form height to thickness ratio to determine the minimum form height for sheet metal use the following formula.
5 edge distortion an exaggerated example of edge deformation is pictured in figure a below.
Use the minimum bend dimension values in the charts below for your minimum closeness of cutout to a bend.
The basics of applying bend functions the fabricator november 2012 by steve benson explains it in detail.
These dimensions may seem helpful but after your manufacturer makes bend deductions based on their capabilities and other bending factors your dimensions will become unusable.
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.
Press brake bend length 0 010 0 25mm per bend for controlled dimension.
Avoid large sheet metal parts with small bent flanges.
As one who daily works with sheet metal design and fabrication use outside flange lengths for several reasons.
A 1 degree tolerance on all bend angles.
Minimum sheet metal flange bend length 3 x sheet thickness bend radius.
This is a common occurrence when manufacturers receive a sheet metal layout dimensioned in the flat pattern.
Sheet metal stretches when it bends is an oversimplification.
Bends on the same plane should occur in the same direction.
Refer to the chart for values for folder as well as various press brake tooling combinations.
Folder bend length 0 010 0 25mm per bend for controlled dimension.
It shall be equal to three times of sheet thickness plus bend radius.
No worries of forgetting a material thickness along the way 3.
Bends in sheet metal are manufactured using sheet metal brakes.
Bends specified as angles may be toleranced at plus or minus one half.
Geometry of tooling imposes a minimum bend dimension.
Minimum sheet metal flange bend length is required to avoid cracks in the bending area.
Figure 3 because the bend line shifts after forming the edge to inside surface dimension will be greater than the edge to bend line dimension.
Sheet metal parts with a minimum of 0 9mm to 20mm in thickness can be manufactured.
When designing parts for laser cutting one should not make holes smaller than the thickness of the material.
The diagram shows one such mechanism.
Bend angle 1 degree.
