If a piece of material is bent too tightly problems can occur.
Minimum radius sheet metal bends.
Minimum inside bend radius for sheet metal recommended inside bend radius for sheet metal parts should be equal to material thickness.
The bend radii listed are standard minimum if manufacturing for aircraft and aerospace applications.
Thick grade 350 and 400 may have a minimum bend radius of 2 5 times the material thickness when transverse bending while longitudinal bending may require a minimum bend radius that s 3 75 times the material thickness see figure 1.
Let s say i have a 2 mm thick sheet and i want to bend it.
Bend radii minimum bend sizes.
Bend radii and minimum bends are limited to certain values or ranges which are determined by the equipment and tooling combinations available to the manufacturer.
Each and every bend in a piece of sheet metal has a certain minimum internal radius that needs to be taken into account when planning the design of a sheet metal form.
Bends specified as angles may be toleranced at plus or minus one half degree at a location adjacent to the bends.
It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.
I can now see that the minimum flange length is 8 5 mm for such a bend so i have to keep it in mind when designing.
Layout method sheet metal stretches when it bends is an oversimplification.
Commonly used bends include v bend z bend offset bend and hemming bend etc.
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.
Use this document to choose values that are both manufacturable and meet your needs.
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.
The minimum bend radius data shown in these charts is measured to the inside of the bend.
The problem with bending too tightly.
Curls the minimum radius is two times the.
Crca inside bend radius equal to 0 65 times of sheet thickness is also enough.
To keep it simple i also use a 2 mm inside radius.
It is most economical to use a single bend radius throughout the.
Bending is a stamping process that uses pressure to force the material to plastically deform.
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.
But for harder materials e g.
In steel between 0 5 and 0 8 in.
Thereby forming a certain angle and curvature shape.
For bent sheet metal variation in the raw material thickness increases the recommended precision to 0 010 in.