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Connection rod and method for production thereof

A technology of connecting rods and rods, which is applied in the field of producing such connecting rods, can solve the problems of increasing production costs and difficulty in obtaining the depth of cross-sectional contours, etc.

Inactive Publication Date: 2006-07-26
阿特拉斯·科普科塞科罗克股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Satisfactory case hardening of internal threads has been found to be problematic due to the difficulty in obtaining a consistent profile depth
For subterranean drilling, it is preferable to have case hardened internal threads for this purpose, which makes it necessary to case harden the entire connecting rod, thereby increasing production costs

Method used

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  • Connection rod and method for production thereof
  • Connection rod and method for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] figure 1 The connecting rod 1 shown comprises a central section 2 formed from a hot-rolled round bar with a through hole 3 in the centre. The rod 1 includes an external thread 4 at one end and an end 6 including an internal thread 5 at the opposite end.

[0016] The connecting rods 1 of this structure can in principle be connected indefinitely by screwing the external thread 4 into the internal thread of another rod.

[0017] from figure 1 It is obvious that the end 6 with the internal thread 5 is formed of a different material than the rest of the rod 1 . Conversely, the externally threaded rod ends consist of the same hot-rolled rod as the connecting rod middle section 2.

[0018] According to the invention, therefore, the end 6 with the internal thread 5 consists of a material which is different from the material of said middle section 2 and which has been specially heat-treated in a manner different from that of said middle section. 2, which is then joined to th...

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PUM

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Abstract

The present invention relates to a connection rod (1) for rock drilling comprising a first rod part (2) which has an external thread (4) provided at one end thereof, wherein the end of the rod opposite to said one end includes an end portion (6) which carries an internal thread (5), wherein the end portion (6) is joined to the first rod part (2) by friction welding and wherein the end portion (6) has been heat treated prior to being joined to said first rod part (2). The invention also relates to a method of producing such a connection rod.

Description

technical field [0001] This invention relates to connecting rods of the type used in underground and surface drilling in rock drilling operations. The invention also relates to a method of producing such a connecting rod. Background technique [0002] When drilling rock, a connecting rod or an extension is used between the drill bit and the shank extension so that a hole of the required depth can be drilled. Connecting rods are connected to the bit and shank adapters with threaded casing joints and interconnected. [0003] The connecting rods are produced in different lengths from one another, typically up to about 3 m in length for underground boreholes and up to about 6 m in length for surface boreholes. A typical connecting rod will have an external thread on one end and an internal thread on the other end. The connecting rod is straight between the two threaded ends. [0004] For ground drilling, the connecting rods used are usually in the form of hot rolled hollow r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/02E21B17/042
CPCE21B17/0426B23K20/12
Inventor L·努德费尔特
Owner 阿特拉斯·科普科塞科罗克股份公司