EVALUATION OF THE INFLUENCE OF THE GEOMETRIC CHARACTERISTICS OF BACK-EXTRACTION OF PIPE BLANKS ON PRODUCT QUALITY
One of the highly efficient ways to extrude hollow parts with variable wall thickness is extrusion. The article considers the operation of manufacturing bushings with variable wall thickness along the height. Simulation of this process was performed, during which the influence of the geometric characteristics of the process and contact friction on the damage of the workpiece material was established. A regression assessment ofpower regimes and damage parameters was performed. Expressions derived on the basis of a regression study are obtained, which make it possible to determine the strength and damageability of the workpiece material. The resulting dependences of the influence of reduction, friction and taper angles of the tool on damageability are obtained.