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Thread joint, inserted unit, unit having internal thread and method for making thread joint

A technology of threaded joints and internal threads, which is applied in the field of manufacturing threaded joints and can solve problems such as short service life of joints

Inactive Publication Date: 2002-11-27
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result of hardening, cracks and fatigue develop in these areas during drilling, and as a result, the service life of the joint becomes relatively short

Method used

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  • Thread joint, inserted unit, unit having internal thread and method for making thread joint
  • Thread joint, inserted unit, unit having internal thread and method for making thread joint
  • Thread joint, inserted unit, unit having internal thread and method for making thread joint

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Embodiment Construction

[0018] The drill rod 10 for percussion drilling shown in Figures 1, 2A and 2B is provided with a casing-shaped part or an internally threaded part 11 which, according to the invention, has at one end a casing-shaped part or an internally threaded part 11 with Internal thread 12. The internally threaded part 11 forms an integral part of the drill rod 10 . At the other end, the drill pipe 10 is formed with a socket joint or male part 13 which, according to the invention, has an external thread 14 . The drill pipe also has a through flushing channel 15 through which a flushing medium, usually air or water, flows. The bottom of internally threaded part 11 forms an annular abutment surface 16, when two drill rods 10 are installed, this annular abutment surface is used for abutting against the corresponding circular abutment of the free end of the shank 13 of another drill rod. Joint surface17.

[0019] Figure 4 with Figures 5A-5D An end view of the male part is shown along w...

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PUM

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Abstract

A thread joint for percussive drilling equipment includes first and second percussive drill string components, the first component including a spigot. An external thread is formed on the spigot, and an internal thread is formed on the second component. Each of the internal and external threads includes an end section gradually transforming into a full thread section. The end section includes a pair of flanks, and the full thread section also includes a pair of flanks. Both flanks of the end section have a different profile than the corresponding flanks of the full thread section.

Description

technical field [0001] The present invention relates to a threaded joint, a plug-in component, an internally threaded component and a method of manufacturing a threaded joint. Background technique [0002] In existing threaded joints between two components of rock drilling rigs for percussion drilling one typically employs cut external and internal threads, see eg SE-B-649,602. In the manufacture of such external threads, a steel blank is formed which comprises a thicker portion whose end is connected to a clearance surface or empty sipe of smaller diameter to receive at least part of the threading tool, and Attached to a generally conical free end. Next, the infeed and lateral feed of the tool is coordinated with the rotational movement of the thicker part to form the thread in the conventional manner in at least one pass. Due to the geometry of the empty sipe and the free end surface, sharp edges are formed at the entry and exit of the thread. Corresponding sharp edges ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/042
CPCE21B17/0426
Inventor 佩尔-奥洛夫·利耶布兰德乌尔班·奥尔松
Owner SANDVIK INTELLECTUAL PROPERTY AB