(For more on this, see “How an air bend turns sharp” on Perfect bend: Specified inside bend radius that’s between 63 percent and 125 percent of the material thickness.įor accurate bend calculations, relieved die widths must be measured by the A dimension. Sharp bend: Specified inside bend radius that is generally 63 percent or less of the material thickness of 60-KSI cold-rolled steel. Note that all measurement values-including material thickness, radius, punch nose diameter, and die width-are in inches unless otherwise specified. I’m calling this the “Grand Unifying Theory” of radius, bend deduction, and die selection, and ultimately it may help you make your bend calculations more accurate than ever.įor this final installment, I’ll review the definitions and bring you through the entire process, from calculating springback to incorporating the bend function calculations. Instead of the traditional terms such as radius and profound-radius bends, we’re using some new terminology. For the past few months I’ve detailed a new way of predicting the inside bend radius.
