METHOD OF PRODUCING THIN-WALL CASES Russian patent published in 2012 - IPC B21C37/18 

FIELD: process engineering.

SUBSTANCE: proposed method comprises rolling metal foil into branch pipe with zone of overshoot, feeding it into external rigging by directed action of pulsed magnetic field and welding biller edges along generating line. Edge welding stabilisation, edges overshoot amount, production of thin-wall shells from foil without thinning of walls is ensured by rolling extra branch pipe, identical to first one. Both branch pipes are fitted concentrically in external rigging to make overshoot zone of first branch pipe displaced relative to that of second one, and fed into external rigging by pulsed magnetic field, while welding of every branch pipe is performed separately in the same rigging but by different inductor.

EFFECT: expanded performances and higher reliability.

3 dwg