Duplex pipe end working method

Details Duplex pipe end working method Duplex pipe end working method

2005-05-24

2005-05-24

Hong, John C. (Department: 3726)

Metal working

Method of mechanical manufacture

Shaping one-piece blank by removing material

C029S557000, C029S558000, C029S417000, C083S054000

Reexamination Certificate

active

06895652

ABSTRACT:
A duplex pipe (10) is cut with a cutting tool (30), for cutting connecting ribs (13) from the end face of the duplex pipe (10) which is held with an outer pipe (11) chucked (rib cutting step). The duplex pipe (10) is cut from the end face of the duplex pipe (10) up to the portion thereof corresponding to the exposed length of the inner pipe (12) to thereby form a slit (21) in the outer pipe (11) and connecting ribs (13) (slit forming step). The cutting tool (30) has a guide hole (31) into which the inner pipe (12) can be inserted while guiding the inner pipe outer peripheral surface (12a), a cutting device (32) for cutting the connecting ribs (13), and a guide pin (33) which can be inserted into the inner pipe (12) while guiding the inner pipe inner peripheral surface (12b).

REFERENCES:
patent: 4070043 (1978-01-01), Becker
patent: 4890865 (1990-01-01), Hosono et al.
patent: 5547231 (1996-08-01), Sharp
patent: 2 367 975 (1978-05-01), None
patent: 63-150106 (1998-06-01), None
patent: WO 9835178 (1998-08-01), None

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