METHOD FOR MAKING HOLLOW BLANKS OF HIGH-STRENGTH MATERIALS Russian patent published in 2003 - IPC

FIELD: rolled stock production, namely plastic metal working, processes for making parts in machine engineering. SUBSTANCE: method comprises steps of heating blank, piercing it to sleeve, rolling out in helical rolling mill, sizing on mandrel at expanding by inner diameter by 3 -10%; shaping inner thickened portion between ends of two mandrels inserted to tube from different sides; rotary reducing at deformation degree consisting 0.5 -0.7 of percentage elongation value for used material; spinning at basing upon inner stop for making inner thickened portion and outer profile; heat treatment between two operations of reduction on austenite mandrel with thermic setting by inner diameter due to difference of heat expansion of mandrel and part. EFFECT: possibility for making high-accuracy shaped rolled blanks of high-strength materials. 2 cl, 5 dwg