16.
    发明专利
    未知

    公开(公告)号:DE19726104A1

    公开(公告)日:1998-12-24

    申请号:DE19726104

    申请日:1997-06-19

    Applicant: EMHART INC

    Abstract: Process for removing punch rivets set into a workpiece with an upper die side which drives the punch rivet and an opposing lower die side penetrating into the workpiece, the punch rivet being provided with a peripheral cutting edge on the lower die side and the upper die side respectively, wherein a pin is placed with its end face on the upper die-side cutting edge, which pin heats the contact region of pin and cutting edge up to a fusing temperature in the contact region by supplying energy through the pin, whereupon after cooling of the contact region the pin is withdrawn counter to the pressure of an abutment resting on the workpiece while entraining the punch rivet withdrawn from the workpiece in the process.

    17.
    发明专利
    未知

    公开(公告)号:DE19701780A1

    公开(公告)日:1998-07-23

    申请号:DE19701780

    申请日:1997-01-20

    Applicant: EMHART INC

    Abstract: A punch rivet (1) has a cutting edge (6) which is arranged on the end face of its rivet shank (2) and is formed in the cutting region by an outer face (5) extending parallel to the axis and a conical inner face (4) of the rivet shank (2). The outer face (5) extends continuously parallel to the axis over the entire rivet shank (2) and the punch rivet (1) is provided with the same cutting edges (6, 7) on either side in an axially symmetrical design in the form of a tube.

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