公开(公告)号：JP2001293535A

公开(公告)日：2001-10-23

申请号：JP2001115179

申请日：2001-04-13

Applicant: EMHART INC

Inventor： MAUER DIETER ,  REINHORUTO OTSUPEE

IPC: B23P19/04 ,  B21J15/02 ,  B21J15/50 ,  B23K9/00 ,  B23K9/20 ,  B23K11/00 ,  B23K20/12 ,  B25B27/02

Abstract: PROBLEM TO BE SOLVED: To provide a method to dismount a punch rivet mounted to a working piece without damaging the working piece. SOLUTION: In a method to dismount the punch rivet in which an upper die side to drive a punch rivet and a lower die side facing it to bite-in to a working piece are arranged, further peripheral biting-in edges are respectively arranged to the lower die side and the upper die side, a pin is arranged at a state an end face of the pin is arranged on the upper side die side biting-in edge, energy is supplied through the pin, a contact region between the pin and the upper die side biting-in edge 10 is heated up to a melting temperature of the region, after the contact region is cooled, the pin is pulled out against the pressure of a member abutted on the working piece, the punch rive pulled out from the working piece during this process is pulled out.

公开(公告)号：JPH1190853A

公开(公告)日：1999-04-06

申请号：JP17249998

申请日：1998-06-19

Applicant: EMHART INC

Inventor： DEIITAA MAUERU ,  REINHORUTO OTSUPEE

IPC: B23P19/04 ,  B21J15/02 ,  B21J15/50 ,  B23K9/00 ,  B23K9/20 ,  B23K11/00 ,  B23K20/12 ,  B25B27/02

Abstract: PROBLEM TO BE SOLVED: To improve workability by putting the tip of a pin on a male die end, heating a formed contact region with the energy fed through the pin, cooling it, retracting the pin in the opposite direction to the pressing pressure, and extracting a punch rivet from a workpiece. SOLUTION: A lug 20 at the tip of a pin 18 is coupled with the recess 21 of a male die end 15. The pin 18 is lifted for several msec to generate an arc, and both surfaces are fused and welded in a contact region 30. The pin 18 is lowered to the fused portion to cool it, and a strong junction is formed. A pad member 22 is mounted on the metal sheet 12 of a workpiece, then the pin 18 is pulled to remove a punch rivet 14 from the rivet junction. Metal sheets 12, 13 are not deformed at least in the region near the pad member 22 during this process. When the punch rivet 14 is completely removed, two metal sheets 12, 13 are separated from each other, and the punch rivet 14 is stuck to the pin 18.