Pipes and tubular conduits – Combined – With end structure
Patent
1995-11-24
1998-04-28
Brinson, Patrick
Pipes and tubular conduits
Combined
With end structure
138177, 72318, F16L 902, B21D 4102
Patent
active
057433011
ABSTRACT:
A method for making an internal upset (20A) on metal drill pipe (10) having a transition section (24A) with a curved inner periphery (28A) of a concave curvature extending continuously between the central portion (12) of the pipe (10) and the increased thickness end section (22A) and formed from a radius (R2). An external upset (20) is first formed in forging steps as shown in FIGS. 2 and 4 by radially expanding and squeezing the end of pipe (10). Then the final forging step radially contracts the external upset (20) to form the internal upset (20A) as shown in FIGS. 3 and 5. The finished internal upset 20A as shown in FIG. 7 has a transition section 24A with an inner peripheral curved surface 28A formed from a radius (R2). The forging steps are performed with a single heating of the metal drill time in a minimum of time preferably within around one (1) minute but in any event less than around two (2) minutes.
REFERENCES:
patent: 1935742 (1933-11-01), Hager
patent: 2313116 (1943-03-01), Babcock
patent: 4100781 (1978-07-01), Zawacki et al.
patent: 4845972 (1989-07-01), Takeuchi et al.
patent: 5184495 (1993-02-01), Chunn
patent: 5361846 (1994-11-01), Carlin et al.
patent: 5375449 (1994-12-01), Bononi
patent: 5379625 (1995-01-01), Hale
Brinson Patrick
Shaw Industries Ltd.
LandOfFree
Metal pipe having upset ends does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Metal pipe having upset ends, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Metal pipe having upset ends will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1524470