Hydrotapping power unit

Details Hydrotapping power unit Hydrotapping power unit

2005-07-12

2005-07-12

Jones, David B. (Department: 3725)

Metal deforming

By application of fluent medium, or energy field

With cutting

C072S056000, C083S053000, C083S054000, C029S421100

Reexamination Certificate

active

06915672

ABSTRACT:
A hydrotapping power unit is disclosed that is operable to position and hold a hydrotapping tool in a home position adjacent a part while the part is being hydroformed in a die cavity, to then advance the tool to pierce a hole in the hydroformed part while the part remains in the die cavity and under pressure and then continue to advance the tool to inwardly extrude the part about the hole, to then further advance while also rotating the tool so that the tool is fed at a feed rate equal to the thread pitch of the tool to thereby form a thread in the pierced hole, and finally to retract while also rotating the tool but in the reverse direction and at the same feed rate to release the tool from the threaded hole. The power unit performing these operations includes a linearly moveable shaft for holding the tool, a powered device for rotating the shaft, a powered device for linearly moving the shaft, and a lead screw connection between the latter powered device and the shaft having a thread pitch equal to that of the tool.

REFERENCES:
patent: 3919871 (1975-11-01), Andrasev et al.
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patent: 5398533 (1995-03-01), Shimanovski et al.
patent: 5737952 (1998-04-01), Baumann et al.
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patent: 6442820 (2002-09-01), Mason
patent: 6591648 (2003-07-01), Ash et al.
patent: 6681611 (2004-01-01), Haag et al.

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