METHOD OF FORMING CAVITY IN PARTS Russian patent published in 1997 - IPC

FIELD: plastic metal working. SUBSTANCE: method involves supplying liquid in preliminarily formed cavity of preliminarily cut blank and closing cavity filled by liquid with tool that presses out final cavity during the whole process of making cavity; providing oil buffer between deformed metal and tool. Deformed metal yielding in zone of oil buffer occurs in mode of liquid friction lowering non-uniformity of deformation in its zone and providing maintenance of metal ductility. That is at the same specific pressure on tool deformation degree of blank increases or reduces at the same deformation specific pressure onto tool. EFFECT: enhanced efficiency. 3 cl, 3 dwg