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            Forming
             
            Forming Practice
              
              Forming Radius (R) /
            Plate Thickness (t)
            @ 60o & 90o
            Die Opening (W) /
            Plate Thickness (t)
            @ 60o
            Die Opening (W) /
            Plate Thickness (t)
            @ 90o
            GRADE Transverse
            to the rolling
            direction R/t
            Parallel to
            the rolling
            direction R/t
            Transverse
            W/t
            Parallel
            W/t
            Transverse
            W/t
            Parallel
            W/t
            A36/44W 2.0 2.5 7.0 8.5 12.0 12.5
            50W/572-50 2.5 3.0 7.5 8.5 12.5 13.5
            HS 100 2.0 3.0 7.0 8.5 13.0 13.5
            HS 400 3.0 4.0 8.5 10.0 13.5 14.0
            HS 500 10.0 12.0 16.0 18.0    
            For bending to 90o  in V-die die opening should "match" top tool radius to prevent impression in the plate.
            Bending Force

            V-die and rollerbending are almost equivalent from a forming point of view. Increasing the die opening decreases the required bending force, but increases the springback. When forming to a 90o angle in a V-die, the value of the formula W/t - (1.4 x R/t) should be greater than 9 to prevent impression in the plate.

            An example:
            Bending a typical 3/8" thick HS 100 plate with a W/t of 12.0 for forming transverse to the rolling direction, and an R/t recommended at 2 for a 90o bend, the formula shows.
            Required bending force for rollerbending and V-die is calculated according to the following formula:
            Bending Forces Needed in a Press Brake - Tons
            THICKNESS WIDTH HS 100 HS 400 HS 500
            1/2" 96" 420 540 560
            1/2" 48" 210 270 280
            3/4" 96" 625 800 840
            3/4" 48" 310 400 420
            Bending force may vary due to die and shoulder design, surface condition and lubrication.
            The springback for different steel grades are illustrated in the table below. To compensate, overbending is necessary.
            Typical Springback for Minimum Recommended Die Width Opening
            GRADE RM P.S.I. SPRINGBACK
            A572-50 80,000 3 - 5o
            HS 100 125,000 6 - 10o
            HS 400 181,000 9 - 13o
            HS 500 225,000 13 - 16o
            Copyright © 2014 High Strength Plates & Profiles Inc. Legal Notice   Accessibility Policy Site designed & maintained by Graphiti Designs.

             

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