METHOD FOR MANUFACTURE OF FLANGED FLAT BENT TANK TRUCK BOTTOM Russian patent published in 2000 - IPC

FIELD: production of means of transportation, in particular, tank trucks with box-shaped section. SUBSTANCE: method involves dividing the process of manufacture of tank truck bottom into two separate processes: preliminary bending of sheet blank in roll-type sheet bending machine for producing flat bent billet, with subsequent flanging of billet in die on crank press; moving billet relative to punch by forcing convex surface of punch against concave surface of billet to obtain flanged and gaged rim of billet with flattened corrugations in closed gap between die and punch. Flanging of billet requires small slide stroke (less than 100 mm), so crank press with slide stroke of 315 mm is sufficient for efficient process. EFFECT: increased efficiency and reduced production cost. 4 dwg