Air Bending Force Chart for Press Brake Tonnage Calculation

If you decide to purchase press brakes from China, below air bending force chart will be helpful for you to calculate press brakes tonnage. The data in the table is based on 1-meter mild steel plate.

Air bending force chart

The given data has been calculated based upon bending material with a tensile strength of δb=420 MPa over a length of 1m.

Air Bending Force Chart

V6810121618202432354050606380100120130140150160180190200230260
b4.5578.51213151723252835434557718592100105115130135140160180
r11.21.622.52.833.555.5689.5101215.519212324.5262830323640

0.5

2.5
0.874.8
1.01186
1.21297
1.515128
2.0231613129.5
2.52622201511
3.03024161412
4.04431282318
5.05347433125
6.061453634
8.08869654736
101108060474339
12120907165585550
1614012511510595818071
181481351251101009580
2014013012011090

The internal radius R corresponds to approximate 16% of the die opening V.

Recommended die opening V for air bending:

Material thickness         t 0.5~2.5mm3~8mm9~10mm>12mm
Die opening          V    6 × t  8 × t10 × t12 × t

Bending force for aluminum and stainless steel is:

Alu

δb=300 MPaF=F(chart)× 0.65
S.Sδb=700 MPa

F=F(chart)× 1.6

Air bending force calculation formula for press brake tonnage determination (approximation):

F(chart)=  65 × t2 / V ( Ton)

 

>> You can also check out The Ultimate Guide to Press Brake (2018 Updated) to fully understand things about press brake.

2018-01-17T10:36:25+00:00 Bending|

2 Comments

  1. Gurpreet Sngh March 25, 2018 at 11:54 pm - Reply

    please explain how to calculate bending tonnage in case of HR sheet with 6 mm thickness x 150 mm width at 90 degree angle

    • MachineMfg March 26, 2018 at 8:50 am - Reply

      that depends cause different steel grade has different tensile strength. Therefore the calculated result will be different.

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