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The work is aimed at the manufacturing process improvement of one-piece products by the deformation of plastic via the means of preliminary shaping of blanks before assembly. The shaped form of a workpiece provides the process of forming the workpiece according to the open piercing scheme with the formation of an annular gap with a minimum barrel-shaped side surface without sinking at the stage of rod penetration, and the localization of deformation only in the embedded part of the rod at the stage of the rod upsetting when the walls limit the form change of the side surface. Using simulation modelling in the QForm software package, they performed the studies of cylindrical image shape change with open piercing for various ratios of the workpiece and the rod geometric dimensions, as well as the studies of the rod end shape change. The main regularities of cylindrical specimen shape change were obtained as the result of the piercing. The fundamental feature of the blank shape change with open piercing is the likelihood of a closed annular gap formed between the lateral surface of the rod and the resulting cavity in the blank. The piercing continually
goes with the formation of sinking at the end of the workpiece from the side of the rod penetration. On the basis of the research carried out, mathematical models of workpiece shaping is created, which allow to take into account the unevenness of deformation during assembly and guarantee the adequate quality of the obtained a one-piece product with the deviation of geometric parameters within the range of precise hot forging.
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