First we must start with the k factor.
Sheet metal bend radius table.
This punch and die set would be mounted in a press.
Sheet metal bend radii.
Refer to the first column to choose your material thickness.
The minimum bend radius data shown in these charts is measured to the inside of the bend.
In fact the manufacturer s bending knives usually have a rounded corner of 0 3 and a small number of bending knives have a rounded corner of 0 5.
The bending angle is 90 sheet thickness 5 mm and the inside radius is 6 mm.
Since commercial sheet metal bending can be done with less concern for stresses caused during forming operation the radius can be near zero for thin sheet metal.
Where necessary 5052 h32 may be bent to 1t and 6061 t6 to 1 1 2t.
You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.
Bend radii minimum bend sizes.
An air bend force chart or force chart breaks down a number of key components of sheet metal bending in an easy to reference format.
Consider what minimum bend size you require only consider lines that meet your minimum bend requirement.
The data in the above table is the preferred data and is for reference only.
Therefore the bending inner radius of our sheet metal parts is basically 0 2.
Being able to read a bend force chart is crucial for any brake press operator and sheet metal engineer.
The bend radius of a sheet metal design will be based on the wall thickness of the part and the tooling that is available in house.
Refer to table s for your choice of material.
Use this document to choose values that are both manufacturable and meet your needs.
You may choose any bend radius on this line s.
A section view of a typical punch and die set used to create sheet metal bends.
The material thickness will be measured in decimal form not by the gauge number.
We want to know the final length of the detail.
If these guidelines are not followed more research and or some form of analysis may be requried.
If you have multiple options optimize your choice.
The bend radii listed are standard minimum if manufacturing for aircraft and aerospace applications.
The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.
Preferred recommended 90 degree bend radii for various sheet metals.
Figure 2 shows us a typical punch and die set used to bend sheet metal.
It is most economical to use a single bend radius throughout the design but if necessary you can utilize multiple radii.
Another way to determine the k factor is by following the rule of thumb.
