Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Plural or complex apparatus
Patent
1994-11-14
1996-05-21
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Plural or complex apparatus
72318, 72356, 72370, 723421, B21D 4102
Patent
active
055178430
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: 4845972 (1989-07-01), Takeuchi et al.
patent: 5184495 (1993-02-01), Chunn
patent: 5379625 (1995-01-01), Hale
Crane Daniel C.
Shaw Industries Ltd.
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