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Title:
OIL WELL PIPE SCREW JOINT, AND THREADING METHOD AND APPARATUS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2000/006937
Kind Code:
A1
Abstract:
An oil well pipe screw joint having a load surface whose load flank angle is negative, wherein at a position where the load surface is bisected in the direction of the height of the male threads, the load flank angle is changed such that the upper load flank angle is smaller than the lower one; and a threading method and an apparatus therefor, wherein, in cutting threads for an oil well pipe screw joint having a load surface whose flank angle on one side is negative by using a chaser having a cutting edge corresponding to the thread shape in question, a plurality of chasers having many kinds of cutting edge shapes successively assigned thereto which are to be used from the start to the end of thread cutting are attached to a single rotary body so that a single thread can be cut by one revolution of the rotary body.

Inventors:
Yamaguchi, Masao (Chita Works Kawasaki Steel Corporation 1, Kawasakicho 1-chome Handa-shi Aichi, 475-8611, JP)
Application Number:
PCT/JP1999/004081
Publication Date:
February 10, 2000
Filing Date:
July 29, 1999
Export Citation:
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Assignee:
KAWASAKI STEEL CORPORATION (1-28, Kitahonmachi-dori 1-chome Chuo-ku Kobe-shi Hyogo, 651-0075, JP)
Yamaguchi, Masao (Chita Works Kawasaki Steel Corporation 1, Kawasakicho 1-chome Handa-shi Aichi, 475-8611, JP)
International Classes:
B23G1/22; B23G1/32; F16L15/06; (IPC1-7): F16L15/04; B23G1/22
Foreign References:
JPH09119564A
US5348350A
JPS60157583A
JPH05277829A
Other References:
See also references of EP 1020674A1
Attorney, Agent or Firm:
Ochiai, Kenichiro (Kawasaki Steel Corporation Tokyo Head Office Hibiya Kokusai Building 2-3, Uchisaiwaicho 2-chome, Chiyoda-ku Tokyo, 100-0011, JP)
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