Can anyone recommend information on the minimum bend radii for rotary draw bending ASTM A-36 steel angle
Can anyone recommend information on the minimum bend radii for forming ASTM A-36 steel angle profiles using the rotary draw bend method with the leg in?
Specifically, I am looking to cold form either 3/4″ x 3/4″ x 3/16″ or 1″ x 1″ x 3/16″ ASTM A-36 steel angle about the smallest radii, with the leg facing in topwards the die, that is reasonably possible. The bender is a Pines rotary bender. Not sure of the specific model, but model can be determined if neccessary.
ASTM A36 [1] steel has an elongation at break of 21% for 3/16″ plate. You want to make sure that the elongation in you bend does not exceed this number otherwise you will get failure.
For the 3/4″ part the minimum radius would be approximately 3.6″ and fro the 1″ angle the minimum radius would be approximately 4 3/4″. This assumes that the neutral axis of the bend is approximately the inside radius.
Niel