METHOD OF MAKING HOLLOW PRODUCTS WITH INNER PROFILE AND APPARATUS FOR PERFORMING THE SAME Russian patent published in 1997 - IPC

FIELD: plastic metal working, namely, technique and equipment for extruding articles with complex inner profile. SUBSTANCE: hollow product is made by pressing out extrudate from solid round blank through shaped die. Profiling of product is realized on outer surface of extrudate whose outer surface is in the form of two halves of product joined by bridge. When pressing out process is over and bridge is removed, said halves are rigidly joined along their profiled surfaces. Apparatus for making hollow products includes container with liquid mounted on foundation. Movable ram and cone die are arranged in container. Calibrating hole of die is double-orifice one. Two mutually opposite surfaces of hole are shaped. Orifices of die hole are mutually joined by through groove. EFFECT: enhanced efficiency of method, improved design of apparatus. 3 cl, 3 dwg