Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1995-03-27
1997-07-29
Bryant, David P.
Metal working
Method of mechanical manufacture
Assembling or joining
2853825, B21D 3904
Patent
active
056511736
ABSTRACT:
A method of forming a collar backed doubly upset tubing end includes positioning the collar on the tube, gripping the tube in a die and finally positioning the collar coplanar with the die and with a preferred length of tube extending axially beyond the coplanar collar and die faces. The tube end is axially impacted by a frustoconical punch forcing the tube end axially toward the collar while allowing a tube portion intermediate the tube end and the collar to expand radially outwardly. The tube end is then axially impacted for a second and final time with a recessed flat punch to flatten the tube end. Apparatus for performing the method as well as the product produced thereby are also disclosed.
REFERENCES:
patent: 2545930 (1951-03-01), Richardson
patent: 4980961 (1991-01-01), Caudill
patent: 5283951 (1994-02-01), Davenport et al.
Roy William B.
Steffen Terry E.
Turner Laral E.
Vigar Brad A.
Bryant David P.
Rickert Roger M.
Whitley Products, Inc.
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