Crimping a heat sink, the heat sink-integrated power module, a method of manufacturing a crimping heat sink, and method for producing a unitary heat sink power module

Crimping heat sink has an outer peripheral portion (3a, 3s), fins sandwiching crimping portion having a bifurcated shape (4) first fin insertion groove (5) and the second fin insertion groove (5) is formed a base (3), a first fin (1) which is fixed with a caulking portion to the first fin insertion groove of the fin base (3), the crimping portion to the second fin insertion groove of the fin base (3) using a second fin which is fixed (1) and has openings (2a), and a peripheral portion and the panel placed on the (3a) (2) of the fin base (3). The thickness of the outer peripheral portion (3a, 3s) is smaller than the thickness of the fin base (3).