Method and apparatus for forming a threaded hole in a...

Details Method and apparatus for forming a threaded hole in a... Method and apparatus for forming a threaded hole in a...

2005-08-23

2005-08-23

Jones, David (Department: 3725)

Metal deforming

By application of fluent medium, or energy field

With cutting

C072S370270, C083S054000, C029S421100

Reexamination Certificate

active

06931901

ABSTRACT:
Method and apparatus are disclosed wherein a required threaded hole is formed in a hydroformed part with a single tool while the part remains in a hydroforming die cavity. In forming the threaded hole, a hole is first pierced in the wall of the part and then an annular region of the part extending about the hole is extruded inwardly to form an integral tubular neck defining a hole of predetermined depth. The hole is then expanded in a sizing operation to a diameter determined by the required thread to be formed therein by material displacement and the required thread is then formed in the wall of the hole in a material displacing manner.

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