CALCULATION OF DRAWING FORCE FOR NON-MANDREL PIPEDRAWING PROCESS——SOLUTION BY FUNCTION BALANCING METHOD IN EXTREME VALUE PRINCIPLE

The incremental function of metal mass point displacement vs strain in the deformation zone in non-mandrel pipe-drawing operation have been determined via the function balancing method in extreme value principle and the math simulator for the drawing force established in the energy principle.Supported by a comparison with the result of experimental cold-drawing operation ofsteel tubes, it is concluded that more accurate data can be obtained with the calculation method presented in the article.