Patent ID: 8905747
Filing Date: 2014-12-09
Classification: B21D,B22D,B29C

Abstract:
1. A punch pin for use in removing a film flash formed at the inside of a flange portion of a casting part, moving toward and away from the casting part, comprising: a supporting base; and a processing portion supported by the supporting base, wherein the processing portion comprises: wherein one of the supporting base and the processing portion has a cylindrical portion and the other has a hollow cylindrical portion, whereby the cylindrical portion is slidably inserted into the hollow cylindrical portion, separated from each other by a biasing member, and further comprising a rotation mechanism for rotating the processing portion around the supporting base when the punch pin approaches the casting part to press the film flash, the rotating is actuated by the same power source as to press the film flash, the flange of the cutting edge portion contacts the flange portion of the casting part, the supporting base and the processing portion are each pressed against the biasing member and the cylindrical portion slides into the hollow cylindrical portion, whereby the grooves remove leaned flashes, which are remained parts of the periphery of the film flash attached to the inside of the flange portion.