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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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