To repetitively perform burring on a pipe material of a small diameter or metal material with high accuracy.
A burring device 1 is configured by containing a burring punch 5, a ball plunger 8 holding the burring punch 5 on the spot, and a burring die 5 clamping one side of a pipe material P by a clamp part 41 when the burring punch 5 slides to accept the burring punch 5 in an acceptance space 42 in a case 6. A series of burring processes of making the burring die 4 clamp one side of the pipe material P by moving it by a mechanism of a grooved cam by a leading end part 71 of a die shifter 7, downward sliding the burring punch 5 held by the ball plunger 8 on an inclined sliding surface 211a of a leading end part 211 of a cam lever 21 to form a punched hole, and raising a leading end part 31 of a punch pusher 3 to make it penetrate the burring die 4 and the punched hole to push the burring punch 5 back to its original position, is performed.
| JPH09308919A | 1997-12-02 | |||
| JPH10193000A | 1998-07-28 | |||
| JPH0899133A | 1996-04-16 | |||
| JPS63196319U | 1988-12-16 |
Shinichi Fukuda
Kyosuke Kato
Next Patent: MECHANISM FOR PREVENTING MOVEMENT OF LIGHT BEAM SAFETY DEVICE