Heat transfer member and method for manufacturing same

A method for manufacturing a heat transfer member comprising the step of:

• subjecting a material to be worked, which is made of a metallic thin sheet, to a press forming utilizing a press-forming device to form a heat transfer member for a heat exchanger, said heat transfer member having a prescribed shape, said heat transfer member having on at least one portion thereof a heat transfer face that has opposite surfaces, which are to come into contact with heat exchange fluids, respectively;
• wherein:
• said press-forming device comprises a pair of main molds for forming the heat transfer face on a prescribed portion of the material to be worked, which is to be conveyed in a single feeding direction, two pairs of first auxiliary molds, which are disposed on upstream and downstream sides of the pair of main molds in the feeding direction of the material to be worked, so as to be exchangeable, and two pairs of second auxiliary molds, which are disposed on opposite sides of said pair of main molds in a perpendicular direction to said feeding direction, so as to be exchangeable;
• a plurality of portions of the material to be worked is subjected to the press forming utilizing at least one pair of said pair of main molds and said two pairs of first auxiliary molds to form the heat transfer member having a plurality of press-formed portions in a prescribed pattern;
• and
• said press forming device carries out applying simultaneously the press forming to the material to be worked within a prescribed area starting from one end thereof, with a use of said pair of main molds and one of said two pairs of first auxiliary molds, while keeping another of said two pairs of first auxiliary molds in a non-contacting state with the material to be worked.