| 摘要 |
PURPOSE:To perform smoothly and surely deburring and to maintain the accuracy of a product by providing a change to the height of a blade for cutting burr to disperse cutting load and determining the point where the rolling down force of a blanking die acts on the inside lateral face of both side members in the upper part. CONSTITUTION:A cutting blade 1 is changed alternately in the height of its edge (into a rugged shape) so that cutting load is dispersed by starting cutting of a burr B first from a high edge 3 then shifting the cutting to a lower edge 4. When a forging A is rolled down by a blanking die 2, the rolling force is acted on the inside slope (e) of both side members (d) in the upper part of the forging A so as to allow a small clearance (c) to remain between the bottom end of the die 2 and the intermediate member (a) surface of the forging A. More specifically, the rolling down force of the die 2 is acted on the slope (e) to bring the deformation behavior toward opening of both side parts (b) of the forging A toward the inside. The cutting load for the bur is thus made small and in addition the disadvantage in the prior art that the members (b) of the forging A tends to deform for opening is eliminated. |
