| 摘要 |
PROBLEM TO BE SOLVED: To provide a burring processing method and its apparatus capable of improving accuracy of a material to be burring-processed by extending the travel volume of a burring punch when the burring processing is executed by arranging the burring punch inside the material to be processed such as a pipe or the like and capable of applying a press machine belonging to general purpose machines. SOLUTION: A punch holder 23 which can be inserted into the inside of the material to be processed 1 is provided, and the burring punch 25 is provided in the punch holder 23 so that the burring punch is movable in the diameter direction of the material to be processed 1 and the burring processing section 25b can be protruded from the punch holder 23. In the opposite side against the burring processing section 25b in the burring punch 25, a pressing pin 21 to press and move the burring punch 25 is provided, and in the burring processing section 25b side, an energizing mechanism A to energize the burring processing section 25b of the burring punch 25 protruded from the punch holder 23 to the punch holder 23 side is provided.
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