| 摘要 |
PROBLEM TO BE SOLVED: To provide a burring die device capable of burring a plate with different thickness or different diameter of a prepared hole without changing a die. SOLUTION: An upper die 2 and a lower die 3 are constituted by a plurality of kinds of burring dies 4 and burring punches 12 according to the thickness of a plate 7 to be burred and the diameter of the prepared hole 7a, and at least one of the burring die 4 and the burring punch 12 is switched to the burring position O between the upper die 2 and the lower die 3 by a switching means. The prepared hole 7a can be burred without changing the die by switching the burring die 4 and the burring punch 12 according to the thickness and the diameter to the burring position O by the switching means 13 when the thickness of the plate 7 to be barred and the diameter of the prepared hole 7a are changed, and thus, the step-up time can be considerably shortened, the rate of operation of a machine is improved, and the productivity is improved thereby.
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