Results of calculation of pressure distribution along the gap for the hydrostatic extrusion scheme with an uncompressed shank

Hydrostatic extrusion implemented in the fluid friction regime creates the most favorable stress state of the billet in the deformation zone, which ensures its improved mechanical properties: increased yield strength and strength with a high margin of plasticity, and greater uniformity. In order to implement the fluid friction regime throughout the entire process, a hydrostatic extrusion scheme with an uncompressed shank is proposed with the working chamber structurally divided into two cavities – radial and axial ones, and process design schemes are developed. The paper presents the results of calculation of pressure distribution along the shank for this scheme with regard to non-isothermal fluid flow in a thin annular gap, their graphical interpretation (pressure distribution diagrams along the shank at pressure drops ΔP), and data analysis. The pressure calculation results obtained can be used to determine the gap along the shank with regard to elastic deformation of the working chamber walls and the shank, and to adjust the calculation of other process parameters.