COMBINATION-ACTION DIE SET FOR DRAWING CYLINDRICAL BODIES Russian patent published in 1997 - IPC

FIELD: plastic metal working, namely reversing deep drawing of cylinder bodies from sheet materials. SUBSTANCE: die set includes upper and lower plates, blanking die, blanking punch-die for first drawing stage, punch-die for first and second drawing stages, punch-die for second and third drawing stages, punch for third drawing stage, three holders, power cylinder with two pistons subjected to action, for example of air, punch holder with stem. Working members are mounted on lower plate in different levels. Pistons of power cylinder are telescopic ones. Outer piston engages with first holder, inner piston - with third holder. Die set is provided with four threaded pins arranged on upper plate and mutually spaced by 90 degrees with possibility of engaging with said blanking die for adjusting pressure of second holder and correcting its position. EFFECT: possibility of multiple reversing drawing, manufacture of large-depth parts by one stroke of press with use of one die set. 5 dwg