Piercing method and piercing apparatus using hydroforming...

Details Piercing method and piercing apparatus using hydroforming... Piercing method and piercing apparatus using hydroforming...

2011-08-23

2011-08-23

Jones, David B (Department: 3725)

Metal deforming

By application of fluent medium, or energy field

With cutting

C072S058000, C072S061000, C029S421100, C029S515000, C029S522100

Reexamination Certificate

active

08001819

ABSTRACT:
The present invention was made with the object of eliminating the short pipe member when attaching a bolting nut to a hydroformed part, preventing an increase in the difficulty of hydroforming for attaching the nut, extending the nut length so as to enable sufficient strength at the time of bolting, and enabling application even to thin wall hydroformed parts and comprises inserting a metal pipe into a split mold having a pierce punch able to be moved perpendicular to an axis of the inserted metal pipe or in a slanted direction, having a front part narrower than a center part, and having around the front part a nut having an inside diameter larger than an outside diameter of the front part and smaller than an outside diameter of the center part; hydroforming it; then making the pierce punch advance to pierce part of the hydroformed part and pushing the nut by a center part arranged behind the nut and embedding the nut in the metal pipe.

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International Search Report dated Dec. 25, 2007 issued in corresponding PCT Application No. PCT/JP2007/071360.
Canadian Office Action in Canadian Application No. 2,667,269 dated Jul. 9, 2010.
Office action issued Mar. 28, 2011 in the counterpart Canadian Application No. 2,667269.

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