Determination of parameters of the clearance with consideration to elastic deformations in various schemes of hydroextrusion

Abstract

Abstract The scheme of all-around (triaxial) compression of the deformable material in the deformation center is the most favorable and desirable scheme from the point of view of giving the material high values of its physical and mechanical properties. The intention to bring real technological processes closer to implementation of this scheme led to development of range of technologies for processing meterials with a high-pressure fluid and, in particular, hydroextrusion of materials. The hydroextrusion process in the most comprehensive way meets the requirement of all-around compression scheme of material when it this material is compressed in the hydrodynamic friction mode, which stable nature of flow depends on flow rate of a working fluid entering through the annular clearance between the plunger and the chamber. The flow rate is determined by pressure differential and the parameters of the clearance itself. Therefore, there is a need for analytical study of clearance parameters for various hydraulic extrusion schemes. This article analyzes the work motion pattern of an uncompacted plunger in a solid container and for hydroextrusion with an uncompressed shank. For these hydroextrusion schemes the mathematical equations are proposed in order to determine the parameters of the clearance, taking into account the elastic deformations of the container and the plunger (shank).