Flat Hem Formula for Sheet metal

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  • Rusman Siringoringo
    Member
    Post count: 0
    #13738 |

    I will know tonnage formula for making flat hem for sheet metal if that has to do with the plate thickness and length of the product that will be in the flat hem.
    Example: we will flat hem the plate with thickness about 1.5 mm and length of the plate 2,200 mm.
    How many tonnage we needed?

    Thank you very much for your help.

    deyner azañedo
    Member
    Post count: 5
    #13791 |

    I saw the next table in https://en.wikipedia.org/wiki/Hemming_and_seaming based on Benson, Steve D. (1997), Press brake technology: a guide to precision sheet metal bending

    Tons per meter requirement for hemming cold-rolled steel and stainless steel

    Material Open hem Closed hem
    thickness
    [mm]
    0.6 9 23
    0.8 12 32
    1.0 15 40
    1.2 17 50
    1.6 24 63
    2.0 30 80
    2.6 55 90
    3.2 70 100
    4.5 105 200

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