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An engineering technique has been developed that makes it possible to determine the power regimes of the process of crimping a tubular billet in a conical die, taking into account the effect of deformation conditions. The influence of the geometric parameters of the workpiece and tool, the crimping coefficient and non-contact deformation on the axial stress of the crimping process is studied. The main factors influencing the limiting values ​​of the workpiece crimping factor are established. Calculations are performed for the crimping process performed on an open circuit (without stop block), taking into account the friction and hardening of the material. The obtained results are in good agreement with the known experimental data and can be used in the development of the processes of crimping of pipe billets.

The work balance method was used to study the effect of the indenter diameter on the indentation size effect when measuring Brinell hardness. It is shown that the main criterion for the indentation size effect is the specific work of plastic deformation when an indenter is introduced. The conditions of indentation are established to ensure the smallest deviation of the actual hardness value from the true one. The results of the study can be used in determining the mechanical characteristics of materials and in the practice of metal forming processes.

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