Gm Global Technolgoy Operations, Inc.

Darrell W Rebman

Paul Edward Krajewski

William R Rodgers

Mike M Ghiran

Spyros Pete Mellas

Kevin R Marks

Howard W Cox

Terry Andrew Kent

Michael H Lovell

David H Shea

Thomas W McClure

Tiffanie E Coe

William Parker

John Collins

A method and system for forming a part from a workpiece including a hollow portion, using a mandrel and a conventional press such as a stamping press includes filling the hollow portion of the workpiece with a mandrel material and transforming the mandrel material to form a mandrel. The mandrel material is removable from the formed part and may be recycled to form a mandrel for another workpiece.

Internal mandrel and method

A tool adapted to form and method of forming a tapped hole within a workpiece in a single pass, includes a piercing section operable to punch a pilot hole in and produce a slug attached to the workpiece, and a tapping section operable to form a female thread along the periphery of the hole, and more preferably, an extruding section operable to push workpiece material away from the exterior surface defined thereby, an expanding section operable to expand the diameter of the hole, a sealing section operable to seal the hole during a hydroforming process, and a burnishing section operable to further expand and treat the periphery of the hole prior to tapping.

Tool for and method of forming at tapped hole in a single pass

Growing community of inventors

Kimball Township, MI, United States of America

Darrell W Rebman