METHOD FOR MAKING FLANGED SLEEVE Russian patent published in 2002 - IPC

FIELD: plastic metal working, possibly manufacture of parts such as flanged sleeves with stepped cavity by cold die forging. SUBSTANCE: method comprises steps of cutting off initial blank, aligning its ends and making small-diameter stepped cylindrical portion by direct extrusion process; rounding along radius joining surface of above mentioned portion of blank with its cylindrical large- diameter portion; forming inner cavity in blank by extrusion and forming flange by upsetting; simultaneously at forming flange sizing along depth extruded inner cavity for subsequent formation of small-diameter inner cavity by extrusion; punching hole for threading it. EFFECT: enhanced quality of parts, improved strength of tool. 1 dwg