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Plasma quenching method of screw threads of petroleum drilling tools

A plasma and oil drilling technology, applied in the field of ion quenching, can solve the problems of limiting the popularization and application of laser surface quenching technology, unsatisfactory anti-sticking effect, expensive equipment, etc., and achieves wide processing range, stable working performance and long service life. Effect

Active Publication Date: 2011-08-10
HENAN SHENLONG GASOLINEEUM DRILLING TOOLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, copper plating and phosphating treatment are carried out on the thread and sealing shoulder of the drill tool joint at present, and the anti-sticking effect is not ideal.
Laser hardening technology is adopted, but because the technology is not yet mature, the threaded part is easily deformed after treatment, the surface of the part needs to be blackened before treatment, and the whole set of equipment is expensive, these problems limit the promotion and application of laser surface hardening technology in the machinery manufacturing industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: processing NC26-35 screw thread, comprises the following steps:

[0018] (1) Conical surface outside the vehicle

[0019] The operator clamps the oil drilling tool workpiece on the CNC pipe thread lathe, measures the runout of the outer circle ≤ 0.3mm at the front and rear chucks of the bedside box, and then clamps it. Adjust the machine speed to 130 rpm, flat end face, and turn 1:6 The outer conical surface and shoulder surface to the size of the drawing;

[0020] (2) CNC car external thread

[0021] After entering the NC26 external thread numerical control programming program, the external thread is machined, and the external thread parameters are detected by the thread parameter measuring instrument. After passing the shoulder chamfering, the guaranteed size is Φ82.9±0.4, and the buckle head is trimmed;

[0022] (3) Plasma beam quenching

[0023] The operator wears special protective glasses, and then adjusts the nozzle of the quenching gun to be flu...

Embodiment 2

[0030] Embodiment 2: processing NC46-65 screw thread, comprises the following steps:

[0031] (1) Conical surface outside the vehicle

[0032] The operator clamps the oil drilling tool workpiece on the CNC pipe thread lathe, measures the runout of the outer circle ≤ 0.3mm at the front and rear chucks of the bedside box, and then clamps it, adjusts the machine speed to 90 rpm, flat end face, and finish turning 1: 6 Outer conical surface and shoulder surface to the size of the drawing;

[0033] (2) CNC car external thread

[0034] After entering the NC46 external thread numerical control programming program, the external thread is machined, and the external thread parameters are detected by the thread parameter measuring instrument. After passing the shoulder chamfering, the guaranteed size is Φ154.8±0.4, and the buckle head is trimmed;

[0035] (3) Plasma beam quenching

[0036] The operator wears special protective glasses, and then adjusts the nozzle of the quenching gun t...

Embodiment 3

[0043] Embodiment 3: processing 8 5 / 8REG, comprises the following steps:

[0044] (1) Conical surface outside the vehicle

[0045] The operator clamps the oil drilling tool workpiece on the CNC pipe thread lathe, measures the runout of the outer circle at the front and rear chucks of the bedside box ≤ 0.3mm, and then clamps it. Adjust the machine speed to 90 rpm, flat end face, and turn 1:4 The outer conical surface and shoulder surface to the size of the drawing;

[0046] (2) CNC car external thread

[0047]After entering the 85 / 8REG external thread CNC programming program, the external thread is machined, and the external thread parameters are detected by the thread parameter measuring instrument. After passing the shoulder chamfering, the guaranteed size is Φ266.7±0.4, and the buckle head is trimmed;

[0048] (3) Plasma beam quenching

[0049] The operator wears special protective glasses, and then adjusts the nozzle of the quenching gun to be flush with the central axis...

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PUM

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Abstract

The invention discloses a plasma quenching method of screw threads of petroleum drilling tools, wherein American Iron and Steel Institute AISI4145H steel is subjected to external thread plasma beam quenching and internal thread circular bead surface plasma beam quenching respectively after procedures of blank alignment, turning, drilling, slack quenching and cutting thread. The method has workingprocedures as follows: a workpiece is held on a machine tool and the nozzle of a quenching gun is well adjusted to be parallel and level to the central axis of the screw threads of the drilling tool so as to ensure the distance from the nozzle of the quenching gun to the crest of external threads or the circular bead surface of internal threads; the air pressure of an argon bottle and a power supply of a plasma quenching generator are turned on one after another to keep a certain air pressure and electric current; and the rotating speed of the main shaft of the machine tool is adjusted to longitudinally or horizontally move a quenching gun according to the size of the workpiece so as to keep the scanning speed for quenching. The hardness of the external thread surface and the internal circular bead surface, treated by the method, is increased by 80 percent, resistance to wear thereof is improved by 5 times and fatigue endurance thereof is enhanced by 10 times. A surface protection layer integrally improves the strength of a thread bearing surface to better bear the impact of the alternating load of 'stretching-compression' during well drilling, thereby effectively solving the worldwide problem of the thread gluing of the drilling tool.

Description

technical field [0001] The patent of the invention relates to a plasma quenching method for threads of oil drilling tools, which is applied to the thread processing of drilling tools such as oil, natural gas and coal bed methane. Background technique [0002] At present, in oil drilling and other industries, oil drilling tools are generally made of AISI4145H steel from the American Iron and Steel Institute. chemical, painting and packaging etc. For oil drilling tools produced by this method, part of the drilling tool threads often fail due to adhesion and cannot be undone during the drilling process, and sometimes have to adopt the method of gas cutting, which not only causes the drilling tools to be scrapped, but also seriously affects the drilling. progress, resulting in certain economic losses. The reason for the damage of the thread of the drilling tool was analyzed, and it was found that the surface hardness layer and insufficient wear resistance were caused. That is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/06C21D9/00
Inventor 张建刚张清明牛战波
Owner HENAN SHENLONG GASOLINEEUM DRILLING TOOLS