CN101108456B - Cold rolling technique of stone oil tool joint thread - Google Patents
Cold rolling technique of stone oil tool joint thread Download PDFInfo
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- CN101108456B CN101108456B CN 200710130835 CN200710130835A CN101108456B CN 101108456 B CN101108456 B CN 101108456B CN 200710130835 CN200710130835 CN 200710130835 CN 200710130835 A CN200710130835 A CN 200710130835A CN 101108456 B CN101108456 B CN 101108456B
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- thread
- cold rolling
- cold
- tool joint
- cold breakdown
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Abstract
The invention discloses a cold rolling process for the thread of a petroleum drill rod joint. After the thread of the drill rod joint is cut on a CNC lathe, a cold rolling device is used for rolling automatically the bottom of the thread. The cold rolling device is provided with a pressure gauge connected with a cold roller. The pressure is controlled to be 6.75 to 6.95 MPa by the pressure gauge during the cold rolling, so as to ensure the depth change of the before and after the cold rolling is 0.025 to 0.038 mm. The invention has standard operation and reasonable process, can effectively remove and reduce the stress concentration at the bottom of the thread of the joint, improve the anti-fatigue and anti-wear performances of the thread, and meet the use requirement of the drill rod, and is especially efficient for any double-step joint of high strength and bearing high torque.
Description
Technical field
The present invention relates to a kind of metalwork cold rolling technique of stone, especially for the cold rolling technique of stone of oil tool joint thread root spreading.
Background technology
Have internal thread or external screw thread on the joint of petroleum drill rod, because there is the geometry of sudden change in the bottom of thread, and arc transition is less, this place can produce the stress concentration phenomenon in process.For tool joint, especially high strength double step joint is bearing the concentrated and generation fatigue failure of stress under the situation of high moment of torsion, and the screw thread anti-wear performance is not good enough in addition, causes scrapping of drilling rod.
Summary of the invention
The technical problem that the present invention will solve provides a kind of working specification, can effectively improve screw thread fatigue resistance and anti-wear performance, guarantees the cold rolling technique of stone oil tool joint thread of drilling rod instructions for use.
Technical scheme of the present invention is: behind the screw thread that processes tool joint on the numerically controlled lathe, utilize cold breakdown device double thread bottom to carry out automatic spreading; Improvements are that the Pressure gauge that is connected with the cold breakdown wheel is housed in the said cold breakdown device; Pressure during through Pressure gauge control cold breakdown is 6.75～6.95MPa, is changed to 0.025～0.038mm with the depth of thread before and after guaranteeing cold breakdown.
For externally threaded roll extrusion in the male joint, the cold breakdown wheel is accomplished roll extrusion by numerical control program from the big small end of holding of screw thread automatically; For the roll extrusion of internal thread in the female joint, the cold breakdown wheel is automatically accomplished roll extrusion from the small end of screw thread to big end by numerical control program.
The Pressure gauge of the present invention through being provided with in the cold breakdown device; The general lever Pressure gauge that adopts; Also available electron formula pressure display unit, the pressure when accurately controlling cold breakdown is 6.75～6.95MPa, and selects the roller of different size according to different screw types; On numerically controlled lathe, carry out the spreading of the bottom of thread automatically, accomplish cold breakdown processing.The variation of in batches measuring the depth of thread before and after the cold breakdown guarantees that its change in depth is 0.025～0.038mm.Above parameter is controlled in evidence, and internal stress can effectively eliminated or reduce to the bottom of thread after spreading, improves the screw thread fatigue resistance, can improve bottom of thread surface roughness simultaneously, strengthens thread surface hardness, improves the anti-wear performance of screw thread.The present invention has also further stipulated the feed mode of roll extrusion internal and external screw thread, helps standard operation, raises the efficiency, and guarantees crudy.
Adopt tool joint antifatigue, wear resistance after the present invention processes good, can bear high moment of torsion, guarantee the oil drill rocker instructions for use.
The specific embodiment
Further specify the present invention through embodiment below.
Example one: behind the external screw thread that processes tool joint (male joint) on the numerically controlled lathe, measure the depth of thread, convert truning fixture into the cold breakdown device subsequently; Be provided with Pressure gauge in this cold breakdown device, according to the code requirement of AP1 (American Petroleum Institute (API)), screw type is V-0.038SST in this example; Should select the instrument number cold breakdown wheel for TDD4485 for use, this roller is installed on the cold breakdown device, roller is connected with Pressure gauge through lever; Adjust the cold breakdown device then the big bottom of roller and external screw thread portion is contacted, pressurization gradually is when the Pressure gauge indicated pressure is 6.88MPa; Start the numerically controlled lathe self-acting feed, accomplish the automatic cold breakdown processing of roller, measure the depth of thread again from the big end of screw thread to small end; The depth of thread changes between 0.025～0.038mm before and after the cold breakdown, and it is qualified to process.
Example two: the cold breakdown of internal thread that for screw type is the tool joint (female joint) of V-0.038SST; Select instrument number cold breakdown wheel for use for TDD4486; According to the step of example one, adjustment pressure is 6.90MPa, accomplishes the automatic cold breakdown processing of roller from the screw thread small end to big end.
Claims (1)
1. cold rolling technique of stone oil tool joint thread; Behind the screw thread that processes tool joint on the numerically controlled lathe, utilize cold breakdown device double thread bottom to carry out automatic spreading; It is characterized in that being equipped with in the said cold breakdown device Pressure gauge that is connected with the cold breakdown wheel; Pressure during through Pressure gauge control cold breakdown is 6.75～6.95MPa, is changed to 0.025～0.038mm with the depth of thread before and after guaranteeing cold breakdown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710130835 CN101108456B (en) | 2007-08-24 | 2007-08-24 | Cold rolling technique of stone oil tool joint thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710130835 CN101108456B (en) | 2007-08-24 | 2007-08-24 | Cold rolling technique of stone oil tool joint thread |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101108456A CN101108456A (en) | 2008-01-23 |
| CN101108456B true CN101108456B (en) | 2012-12-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710130835 Active CN101108456B (en) | 2007-08-24 | 2007-08-24 | Cold rolling technique of stone oil tool joint thread |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101108456B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118689A (en) * | 2019-06-25 | 2019-08-13 | 上海海隆石油管材研究所 | A kind of hydrogen sulfide production test cold rolling four-point bending sample |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4479306A (en) * | 1982-06-07 | 1984-10-30 | Oil Technology Services | Process of manufacturing and using gauges for verifying threads of tubular members |
| CN2386906Y (en) * | 1999-07-01 | 2000-07-12 | 刘晏廷 | Cold rolled screw machine |
| CN1507546A (en) * | 2001-03-19 | 2004-06-23 | 住友金属工业株式会社 | Method of manufacturing threaded joint for oil well pipe |
| CN2626645Y (en) * | 2003-07-18 | 2004-07-21 | 张有龙 | Equal strength rib peeling and rolling external thread mechanism for steel bar with rib |
| CN2644070Y (en) * | 2003-08-19 | 2004-09-29 | 扬动股份有限公司 | Tapping device with depth controlling function |
-
2007
- 2007-08-24 CN CN 200710130835 patent/CN101108456B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4479306A (en) * | 1982-06-07 | 1984-10-30 | Oil Technology Services | Process of manufacturing and using gauges for verifying threads of tubular members |
| CN2386906Y (en) * | 1999-07-01 | 2000-07-12 | 刘晏廷 | Cold rolled screw machine |
| CN1507546A (en) * | 2001-03-19 | 2004-06-23 | 住友金属工业株式会社 | Method of manufacturing threaded joint for oil well pipe |
| CN2626645Y (en) * | 2003-07-18 | 2004-07-21 | 张有龙 | Equal strength rib peeling and rolling external thread mechanism for steel bar with rib |
| CN2644070Y (en) * | 2003-08-19 | 2004-09-29 | 扬动股份有限公司 | Tapping device with depth controlling function |
Non-Patent Citations (2)
| Title |
|---|
| 张建诺.冷滚压工艺在加工钻具螺纹上的应用.《石油矿场机械》.1988,第17卷(第4期),8-11. * |
| 齐会萍,李永堂,付建华.螺纹件冷滚压工艺力学分析及数值模拟.《山西冶金》.2008,第31卷(第112期),9-12. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101108456A (en) | 2008-01-23 |
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