Extrusion tool design technology

The subject of the research is the technology of computer - aided design of an extrusion tool, in particular, an extrusion die and a power screw of an extruder for processing viscous - plastic compressible media. The calculation scheme of the deformation zone in the design of an extrusion die is given, an algorithm and a fragment of calculations of its geometric parameters are offered. For a screw with a rectangular channel profile, the distribution of shear stresses is shown, an algorithm and an example of calculating the geometric parameters of the screw channel are proposed. The considered design technology is based on a theoretical model that relates the rheological properties and tribotechnical characteristics of the processed material with the geometric parameters of the extrusion tool. Examples of designs of the forming head and the power screw of the extruder, designed on the basis of the performed calculations, are shown. The results of the work can be useful in the development of specialized CAD for parts and assemblies of extrusion equipment.