Patent ID: 6651332
Filing Date: 2003-11-25
Classification: B21D,B23K,B23P,F28D,F28F,Y10T

Abstract:
A method for manufacturing a heat transfer member comprising the steps of: subjecting elongated materials to be worked, which are made of metallic thin sheets, to a continuous press forming utilizing a plurality of press-forming devices to form heat transfer faces each having a prescribed shape, while transferring the materials in a prescribed feeding direction, which is in parallel with a longitudinal direction of the materials; and welding two materials, which have been subjected to the press forming, of said elongated materials together utilizing a welding device to form a heat transfer member having substantially a tubular shape, wherein: said method further comprising the steps of: forming flat members each having a prescribed width on longitudinally extending opposite edge portions of said materials to be worked so as to make a difference in level from a longitudinally extending central portion thereof by means of each of said press-forming devices; placing the two materials one upon another so that the flat members of the two materials come into contact with each other, while holding said flat members of the two materials and transferring the two materials, which have been placed one upon another without causing deviation of the heat transfer face, to a next step with a use of a transferring device, which is provided after said press-forming devices; and temporarily securing the flat members of the two materials, which have been placed one upon another, at a plurality of positions, and then, welding continuously and longitudinally said flat members on inner sides, defining the sides in between the edge portions and the temporarily secured positions, in a transverse direction relative to temporarily secured positions to combine the two materials together, with a use of said welding device, thereby forming the heat transfer member having the tubular shape and opposite opening ends in a longitudinal direction.