RUGGED SHAPE FORMING METHOD IN METAL PLATE MATERIAL FOR HEAT EXCHANGER HAVING RUGGED SHAPE FOR CONTROLLING FLOW OF HEAT EXCHANGING MEDIUM

摘要

PROBLEM TO BE SOLVED: To remove friction between a punch and a plate stock and to prevent local thin wall phenomena by applying a large instantaneous current to an electromagnetic forming oil, pressing plate stock for a plate to a die with a magnetic repulsing force and forming a rugged shape for controlling the flow of a heat exchanging medium to the raw plate. ;SOLUTION: A projecting part 11a is integrally formed and provided in the zone arranging the raw plate 6 of one side surface of a flat plate coil 11 in correspondence to each groove part 9a of the die 7. The plate stock 6 and the coil 11 are separated in the zone between projecting part 11a and at the same time the plate stock 6 and the coil 11 are arranged in the proximate state the zone of the projecting part 11a by providing the flat plate coil 11 with these projecting parts 11a. By this way, a strong electromagnetic force in the zone of projecting part 11a and a weaker electromagnetic force than it in the zone between the projecting part 11a are respectively influenced to the plate stock 6, and the strong electromagnetic force is influenced to a required part with such a local strength.;COPYRIGHT: (C)1998,JPO