This is referred to as the 20 percent rule. What am I doing wrong in my figuring? I would like to know so that if we get any other material that we do not usually do, I can have some sort of a baseline for figuring the radius formed without wasting material to find it.Īnswer: Your findings are correct: 18 percent of the die opening is approximately equal to the inside bend radius. I have since used test pieces to get my numbers dialed in. This is not so it seems that it is more like 18 percent. Editor’s note: This chart is for illustration purposes only for the mechanical properties of your material, refer to material property data from the material supplier.īasing the radius factor on the tensile strength of the aluminum in relation to cold-rolled steel, my radius factor should be around 13.5 to 15 percent of the V-die opening. Series 2xxx and 7xxx are extremely strong and difficult to form. The information in this chart reveals that the best series for press brake forming are 3xxx, 5xxx, and 6xxx.
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