Patent ID: 8973420
Filing Date: 2015-03-10
Classification: B21D

Abstract:
1. A corrugated fin manufacturing apparatus for forming a corrugated fin with a plurality of ribs from a plate member made of metal, the corrugated fin manufacturing apparatus comprising: a lower mold; an upper mold capable of moving toward and away from the lower mold; a die provided on the lower mold and including a concave; a machining punch that is inserted into the concave of the die to form a rib when the upper mold and the lower mold are closed, wherein the machining punch is shaped so that when the machining punch enters the concave of the die, the machining punch does not cause resistance to drawing in of a part of the plate member that is present outside the concave of the die and has not been machined into ribs, the machining punch having an upper portion where a first energizing member is provided a mounting portion that is formed on the die upstream of the concave in a conveying direction of the plate member and on which the part of the plate member that has not been machined into ribs is mounted; and a flat punch having a solid rectangular configuration that is separated from the machining punch and provided upstream of the machining punch in the conveying direction of the plate member and having an upper portion where a second energizing member is provided, wherein when a rib is being formed by the machining punch and the concave of the die, the flat punch which moves independently of the machining punch does not cause resistance to drawing in of the part of the plate member that has not been machined into ribs during formation of a rib, and wherein the flat punch starts to move toward the mounting portion of the die after formation of a rib by the machine punch to press down the part of the plate member that has not been machined into ribs and, in combination with the mounting portion, to press and flatten the part of the plate member that has not been machined into ribs.