Investigation of the Effect on the Efficiency of Hot Die Forging Operations Cutting Off and Heating Blanks from Rolled Round Bar

Hot die forging is one of the main technological processes for the forgings production with high performance properties for subsequent, as a rule, machining. One of the most important hot forming process efficiency indicator is its metal consumption, which is determined by the utilization of the metal (the ratio of the finished part mass to the mass of the blank from which this part is made). The value of the metal utilization coefficient depends on a number of interrelated indicators that determine the metal loss during the technological manufacturing operations of the finished part: manufacturing a bar of a given diameter with a certain accuracy, cutting of blank of a given length, heating the blank, stamping of the forging and its mechanical processing. The article proposes a methodology that establishes the influence of the accuracy rolled bar parameters, the blank cutting method, and the heating method on metal losses during hot stamping operations of round forgings on crank presses. The proposed mathematical model and computer program, developed on its basis, allows us to evaluate the effect of metal losses associated with the accuracy of the manufacture of the bar, the operations of cutting and heating the blank, on the metal loss in the manufacture of forgings.