PURPOSE: To form a fin collar part whose thickness is uniform, by constituting a shank part of a punch which is inserted into a die, of a flexible member, and making a hole of the die coincide easily with the center of the punch, in a metallic die for manufacturing a fin.
CONSTITUTION: With regard to a base material 1 which is set between a squeezing die 20 and a stripper plate 22, a fin collar part 16 is subjected to burring and squeezing simultaneously by a squeezing punch 24. The pierced margin of a prepared hole is raised by the first shoulder 24a of the squeezing punch 24, and the base material 1 and the squeezing punch 24 are brought into linear contact and are squeezed by the second shoulder 24b, namely, the maximum diameter part of the punch 24, by which an intermediate thin part of the finger collar is formed. In this process, if the hole of the squeezing die 20 is shifted from the center of the squeezing punch 24, since a shank 25 is flexible, it is guided to the hole of the squeezing die 20 so that both the centers are aligned naturally.
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YAMAUCHI TAKETOSHI
IMAIZUMI YUTAKA
HATADA TOSHIO
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