• Latest from Material Handling

    © HexcelPack
    Forging Buyers 2122 Promo
    April 26, 2022
    BvL Oberflächentechnik
    0 1021 Forg Bv L Niagara 800
    OTEC Präzisionsfinish GmbH
    Otec Stream Finishing Machine 800
    Dillon Manufacturing
    Np Dillon Fast Trac Jaw Nuts1 800
    Verti-Lift
    Verti Lift Double Wide Lifts 800
    Verti-Lift
    Verti Lift Lift Tablew Turntable 800
    FILL GmbH
    Fill Wheel Predeburring Deburring 800
    Monaghan Tooling Group
    Mtg Id Burnishing Grouped 1540
    SW GmbH
    00 Ba722machine

    Determining sheer tonnage

    Oct. 27, 2004
    Q: What is the formula for determining sheer tonnage?
    A: As a general rule, the tonnage is about 60-65% of the ultimate strength of the steel being cut. For example, if it is a 1035 steel and has ultimate strength of 120 ksi (60 tpsi), then the shear tonnage for a 4-in.-square bar is 16 in. 2 times 36 to 39 tons, or 600 to 625 tons to shear the bar. This is for a partially supported bar (behind the shear blade).

    There are ways to reduce the tonnages via a "knick break" system but this can lead to excessive bar end distortions. For elongated forgings this is not a problem, but for upst forging or for short billets, this alternative is not good.

    I recommend that you contact Ajax for data on shear tonnages various cross corner, round, and squarecut shear cuts. As I recall, they have tables for their bar shears.

    H. James Henning answers forgers' technical and operational questions. For more than 40 years he held key technical positions in the forging industry, most recently as director of technology for the Forging Industry Association. He is president of Henning Education Services, Columbus, OH, specializing in customized education and training in forging technologies.

    Send questions to

    ASK JIM
    c/o FORGING
    1300 E. 9th St.
    Cleveland, OH
    44114-1503
    Or e-mail: [email protected]
    About the Author

    H. James Henning

    In all, Jim spent 44 years as a technician, engineer, and supervisor in the forging industry prior to his retirement, including nine years as technical director of the Forging Industry Assn.

    Upon his retirement from FIA in 1996, Jim formed Henning Educational Services Inc. There, he filled a problem-solving role for forgers and other manufacturers seeking solutions to process and organizational issues. He shared his expertise on hot, cold, and warm forging, on tool design principles, process and equipment selection, and productivity and quality improvements.