Patent ID: 6321584
Filing Date: 2001-11-27
Classification: B21D,Y10T

Abstract:
A method for making a folded fin of a heat sink, comprising the steps of:a) preparing a metal plate;b) clamping the metal plate by a first, a second and a third forming jigs in an initial position, the second forming jig being located between the first and the third forming jigs and being equidistant from the first and the third forming jigs, each forming jig including upper and lower jig portions, the lower jig portion of the second forming jig having a tapered end;c) actuating the second forming jig to move upwardly and horizontally toward the first forming jig and the third forming jig to move horizontally toward the first forming jig to a second position where a portion of the metal plate between the first and the third forming jigs has been bent into a pair of symmetrically inclined sections; andd) actuating the lower jig portion of the second forming jig to move downwardly away from the metal plate while the pair of sections are inclined, and to move the third forming jig and the upper jig portion of the second forming jig toward the first forming jig to a final position where the pair of symmetrically inclined sections of the metal plate between the forming jigs has been bent double thereby forming a folded fin.