CN1872448A - Method for manufacturing oil pipe in external upset - Google Patents
Method for manufacturing oil pipe in external upset Download PDFInfo
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- CN1872448A CN1872448A CN 200510026302 CN200510026302A CN1872448A CN 1872448 A CN1872448 A CN 1872448A CN 200510026302 CN200510026302 CN 200510026302 CN 200510026302 A CN200510026302 A CN 200510026302A CN 1872448 A CN1872448 A CN 1872448A
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Abstract
A method for manufacturing the externally thickened oil pipe by forge deformation includes such steps as controlling the wall thickness of raw pipe, controlling the size of internal shaping tool (punching head), controlling the shaping size of external shaping tool (thickening mould), heating pipe end to 1100-1250 deg.C, and forging.
Description
Technical field
The present invention relates to the manufacture method of oil pipe, particularly the manufacture method of API standard external upset tubing.
Background technology
Adopt the method for end upsetting to increase the pipe end wall thickness in the API standard, formed the heavy wall tubing series of products with the be threaded bonding strength of part of raising, see API Spec 5CT table E.27 with table C.27.The method of traditional production external upset tubing has two kinds; One is twice heating, secondary thickening moulding; The 2nd, once heat secondary thickening moulding.
The process for upsetting flow process of method one is: adopt intermediate frequency induction heating device or slot-type furnace, divide several stations that the hot rolled seamless steel tube pipe end is heated to 1050 ℃～1250 ℃; The pipe material that pipe end heats is sent into the die cavity clamping, follow drift upset pipe material forward, metal is out of shape in the die cavity of die cavity and the formation of drift upset face, reach the size of an external upset (EU), at this moment, the external upset (EU) length of pipe end is longer than finished product thickening length, and thickening place external diameter is littler than finished product thickening external diameter; Deliver on the sharpening machine iron scale and defective reconditioning are fallen after the pipe end cooling of thickening; Pipe material through once thickening reheats, and sends into the secondary deformation die cavity, relies on the upset effect of drift to carry out secondary deformation, and the reconditioning pipe end is out of shape muscle and blemish and iron scale subsequently, reaches the pipe end size of API standard external upset tubing.This thickening method quality of production is good, be difficult for producing the pipe end blemish, but consumes energy is many, and the production cycle is long, the production cost height.
The process for upsetting flow process of method two is: adopt heater that pipe end is heated to 1050 ℃～1250 ℃ through multistation, the pipe material that subsequently pipe end is heated is sent into and once is out of shape the die cavity clamping, drift is upset pipe material forward, after being out of shape, pipe end reaches the size of an external upset (EU) in die cavity, at this moment, the external upset (EU) length of pipe end is longer than finished product thickening length, and thickening place external diameter is littler than finished product thickening external diameter; Once the pipe material of thickening is sent into the secondary deformation die cavity rapidly then, rely on the upset of drift to act on continuation distortion in the secondary deformation die cavity, deliver to reconditioning pipe end distortion muscle and blemish and iron scale on the sharpening machine subsequently, reach the pipe end size of API standard external upset tubing.This thickening method only need heat once, and energy resource consumption reduces, and production cost descends, and secondary deformation is finished in one-period, and production efficiency obviously improves; But the temperature during the secondary upsetting deformation obviously descends, and metal flow is relatively poor, is easy to generate blemish, need thicken again and reprocess, and after the appearance thickening was finished sometimes, drift was held tightly and can't be withdrawed from; For the thickening machine that adopts the upset drift, the relative positional accuracy that once is out of shape die cavity and secondary deformation die cavity requires height, and precision is difficult to keep; And mould is of a great variety.
In order to pursue high efficiency, each manufacturer is testing always and is once heating one-time formed production technology, but be difficult to solve the quality problems under the large deformation ratio, for example, API standard 2-3/8 " specification, its body nominal outside diameter is 60.32mm; wall thickness is 4.83mm; the minimum tube material wall thickness that the API standard allows is 4.23mm, and the maximum outside diameter of upset end is 67.48mm, the forging deformation ratio during its thickening can reach [(67.48-60.32)/2+4.83]/4.23=2.08.Table 1 has been listed the deformation ratio of heavy wall tubing regular size in the API standard, and as shown in Table 1, its deformation ratio is all greater than 1.8, big like this metal forging deformation ratio, the easy unstability of system during distortion, metal flow be difficulty relatively, the upset end that is difficult to obtain to have good quality.When Co., Ltd of Baogang Stocks Trading Co. introduces the oil pressure thickening machine from Germany, think on the data that M/D company provides, the forging deformation ratio of thickening during technological design should be not more than 1.5, be that wall thickness behind the upsetting deformation is no more than 1.5 divided by original wall thickness, otherwise be easy to generate unstable phenomenon, and show pit, drum type in often occurring, drift is also held tightly easily and can't be withdrawed from.Up to the present, also there is not ripe once heating one-shot forming thickening method with the supporting output of hydraulic pressure thickening machine.
Summary of the invention
The objective of the invention is to propose a kind of pipe end forming method of external upset tubing, both can guarantee once to thicken moulding after external upset tubing once heats, can obtain stable end upsetting quality again.
For achieving the above object, technical solution of the present invention is,
Key of the present invention is a control forging deformation ratio, at first is the wall thickness dimension of control valve material, avoids wall thickness on the limit inferior of API standard of tolerance; Next is shaping jig---the size of drift in the control, and the mean outside diameter size Control of the size section upper punch of requirement participation distortion is in the upper deviation of pipe material nominal bore diameter; Be to control outer shaping jig compact dimensions at last at the maximum upset end external diameter of API, and with due regard to small reconditioning quality; By the control of control of aforementioned tube material and shaping jig, in the API critical field, reduce the wall thickness of upset end, reduce the forging deformation ratio one time, for realizing that once heating one-shot forming provides the necessary size condition.
Simultaneously, too much abnormal quality occurs, the present invention proposes the tapering of the inner punch deformation section of proper range, make drift also participate in the radial compression of metal, guarantee the flowability of metal for fear of one-shot forming thickening process; If excessive, can cause in drift and the pipe table frictional force big, drift is reduced service life significantly; Too small meeting causes metal flow not smooth, table pit defect in causing.In addition, the present invention proposes by regulating the cooling of heated perimeter or pipe end to set up thermograde, the metal plastic deformation characteristics of large deformation ratio when adapting to one-shot forming, promptly the pipe end heating-up temperature that shortens part wants high, to guarantee that metal plasticity is good in its deformation process; And the temperature of crassitude intermediate belt section after beginning is low, to guarantee higher relatively intensity, slows down the flow of metal of this part, metal convex phenomenon occurs with the interior table of avoiding thickening intermediate zone back, back.
The manufacture method of a kind of external upset tubing of the present invention, it comprises the steps:
1) wall thickness dimension of control valve material, the original wall thickness (D-d)/2 of pipe material be controlled at-more than 7.5%, D is the pipe nominal outside diameter, d is a nominal bore diameter, than API standard-12.5% require highly by 5%, reduce the forging deformation ratio by improving original wall thickness;
2) shaping jig---the size of drift in the control, the average diameter (d of inner punch deformation section
3+ d
2)/2 be controlled at the upper deviation+0.15 of pipe nominal bore diameter d～+ 3mm; Internal diameter swells to some extent when making thickening, thereby has reduced the wall thickness of upset end, reaches the purpose that reduces the forging deformation ratio;
3) the outer shaping jig compact dimensions of control thickening, outer shaping jig---the inside diameter D of external upset (EU) mould
1Be controlled at the maximum upset end outer diameter D of API standard
4MAXAdd within 0～0.4mm reconditioning quality, i.e. D
1≤ D
4MAX+ (0～0.4mm); To guarantee the bonding strength of extra strong pipe, the pipe end internal diameter amount of swelling should guarantee that the wall thickness of upset end satisfies the API standard-required, and promptly wall thickness deviation must not be lower than-12.5%; To reduce the end upsetting amount, reduce the forging deformation ratio.
4) heating of pipe blank, pipe end shortens 1100～1250 ℃ of part heating-up temperatures, to guarantee the plasticity of this part metals, its easy deformation is flow to thicken the position, table pit in avoiding; Temperature after the crassitude intermediate belt section begins shortens low 30～150 ℃ of part than pipe end; To slow down the flow of metal of this part, metal convex phenomenon appears in the interior table of avoiding thickening intermediate zone back, back; The two temperature difference can be cooled off and realizes by controlling effective heated length and/or adjustment end.
5) deformation processing is with pipe forging deformation in shaping jig.
Further, described moulding is a cone with inner punch deformation section L, and its engineering tapering T is 1/300～1/50; Its effect is the radial plastic deformation that promotes metal, and the interior table pit defect when avoiding large deformation than the forging thickening can prevent the violent friction of table generation in drift and the pipe simultaneously.
The method of the external upset tubing of hydraulic pressure thickening machine production both at home and abroad generally adopts twice heating at present, secondary thickening moulding, and rhythm of production is very slow, and consumes energy is many, the production cost height; Also there is producer to adopt and once heats secondary thickening moulding process, but very high to equipment precision requirement, be difficult to be fit to stable mass ground and produce; It is one-time formed that indivedual producers also have employing once to heat, its major technique characteristics are: pipe material size is controlled with reference to the API standard, the mould design designs according to nominal outside diameter, the wall thickness dimension of pipe, only stipulate heating-up temperature and heated length during technology controlling and process in the thickening process, do not had clear and definite thermograde control.By this production technology, API oil pipe wall thickness forging ratio is all greater than 1.80, but the surface quality of upset end is relatively poor, and the inner surface of upset end is prone to pit defect, and qualification rate is not very high, first-time qualification rate about 85%, and the follow-up reconditioning of needs is saved or is done over again.
Beneficial effect of the present invention
The present invention dwindles the dimensional tolerance of pipe material, and the mean outside diameter size Control of drift limits outer shaping jig compact dimensions simultaneously, thereby controls the forging deformation ratio effectively in the upper deviation of pipe material nominal bore diameter.Simultaneously according to the deformation extent requirement of pipe end different parts, set up that pipe end shortens that the part heating-up temperature is wanted height and the temperature low thermograde of crassitude intermediate belt section after beginning, thereby guaranteed the surface quality of large deformation than the metal plastic deformation of situation.By the technology of the present invention production, API oil pipe wall thickness forging ratio is all less than 1.75, and the thickening surface quality reaches standard-required, and the product first-time qualification rate can reach more than 99%.
The API heavy wall tubing that the present invention produces can be realized once heating and once thicken moulding, and its forging deformation is smaller, and the upset end quality is good, and the qualification rate height is suitable for producing in enormous quantities; Its production efficiency height, production cost is low; Each upset end only heats once, and the energy of consumption is less; The lubricant use amount of using in the one-shot forming obviously reduces, and has reduced the pollution of production scene.
Description of drawings
Fig. 1 is a heavy wall tubing pipe end schematic diagram of the present invention;
Fig. 2 is thickening shaping jig of the present invention---an inner punch partial schematic diagram.
The specific embodiment
Further specify the present invention below in conjunction with drawings and Examples.
Referring to Fig. 1, Fig. 1 is a heavy wall tubing pipe end schematic diagram of the present invention, and dotted portion is original pipe end, and wherein D is the pipe tolerance outer diameter, and d is a nominal bore diameter, D
4Be upset end external diameter, L
EUBe upset end length, La is the length of intermediate zone end point to the thickening pipe end, L
WBe the shortening length behind the end upsetting, L
ABe the length of intermediate zone end point to the preceding original pipe end of thickening, L
A=La+L
W, L
VBe the length of intermediate zone starting point to original pipe end.Fig. 2 thickeies shaping jig for the present invention---the inner punch partial schematic diagram, and the deformation section of participation moulding when wherein L is for thickening, T is the tapering of inner punch, d
3Be the big footpath of deformation section, d
2Path for deformation section.
Embodiment
1. API standard heavy wall tubing, specification is 73.02mm * 5.51mm, nominal bore diameter d is 62mm, according to the API standard, the minimum wall thickness (MINI W.) of this specification is 4.82mm, and its upset end external diameter is 78.59 (0 ,+1.59) mm, thickening back as internal diameter are pressed nominal bore diameter and external diameter is pressed maximum outside diameter 80.18mm calculating, and then its maximum forging deformation ratio can reach 1.88.Adopting design of the present invention, the supplied materials wall thickness is controlled at-and more than 7.5%, promptly minimum wall thickness (MINI W.) is controlled at 5.10mm, the big footpath d of inner punch deformation section L
3With path d
2Mean value be 63mm, the internal diameter of external upset (EU) mould is designed to the maximum upset end external diameter 80.18 of API standard and adds the 0.4mm reconditioning quality, i.e. 80.58mm, the forging deformation ratio of this moment has only 1.72, has reduced the forging deformation ratio effectively; Inner punch deformation section tapering is 1/150, can promote metal flow, the generation of table pit in effectively suppressing; During thickening,, make the metal temperature of shortening amount part reach 1100～1250 ℃ by controlling effective heated length, adjustment end cooling etc., higher 30～150 ℃ than the metal temperature behind the crassitude intermediate belt position.The heavy wall tubing production qualification rate of above-mentioned design reaches more than 99%, can satisfy requirement of mass production; And above-mentioned pipe is tested according to the API standard, and its internal pressure strength and bonding strength all satisfy the requirement of API standard performance.
2. API standard heavy wall tubing, specification is 88.9mm * 6.45mm, nominal bore diameter d is 76mm, according to the API standard, the minimum wall thickness (MINI W.) of this specification is 5.64mm, and its upset end external diameter is 95.25 (0 ,+1.59) mm, thickening back as internal diameter are pressed nominal bore diameter and external diameter is pressed maximum outside diameter 96.84mm calculating, and then its maximum forging deformation ratio can reach 1.85.Adopt design of the present invention, the supplied materials wall thickness is controlled at-more than 7.5%, be that minimum wall thickness (MINI W.) is controlled at 5.97mm, the big footpath of inner punch deformation section and the mean value of path are 76.2mm, the internal diameter of external upset (EU) mould is designed to the maximum upset end external diameter 96.84 of API standard and adds the 0.4mm reconditioning quality, be 97.2mm, the forging deformation ratio of this moment has only 1.78, has reduced the forging deformation ratio effectively; Inner punch deformation section tapering is 1/160, can promote metal flow, the vexed car problem of the generation of table pit and " embracing drift " in effectively suppressing; During thickening,, make the metal temperature of shortening amount part reach 1100～1250 ℃ by controlling effective heated length, adjustment end cooling etc., higher 30～150 ℃ than the metal temperature behind the crassitude intermediate belt position.The heavy wall tubing production qualification rate of above-mentioned design reaches more than 99.5%, can satisfy requirement of mass production; And above-mentioned pipe is tested according to the API standard, and its internal pressure strength and bonding strength all satisfy the requirement of API standard performance.
Claims (2)
1. the manufacture method of an external upset tubing, it comprises the steps:
1) wall thickness dimension of control valve material, the original wall thickness (D-d)/2 of pipe material are controlled at that nominal wall thickness-more than 7.5%, D is the pipe nominal outside diameter, and d is a nominal bore diameter;
2) shaping jig---the size of drift in the control, the average diameter (d of inner punch deformation section
3+ d
2)/2 be controlled at the upper deviation+0.15 of pipe nominal bore diameter d～+ 3mm;
3) the outer shaping jig compact dimensions of control thickening, outer shaping jig---the inside diameter D of external upset (EU) mould
1Be controlled at the maximum upset end outer diameter D of API standard
4MAXAdd within 0～0.4mm reconditioning quality, i.e. D
1≤ D
4MAX+ (0～0.4mm);
4) heating of pipe blank, pipe end shortens 1100～1250 ℃ of part heating-up temperatures; Temperature after the crassitude intermediate belt section begins shortens low 30～150 ℃ of part than pipe end;
5) deformation processing is with pipe forging deformation in shaping jig.
2. the manufacture method of external upset tubing as claimed in claim 1 is characterized in that, described moulding is a cone with inner punch deformation section L, and its engineering tapering T is 1/300～1/50.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100263027A CN100391648C (en) | 2005-05-30 | 2005-05-30 | Method for manufacturing oil pipe in external upset |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100263027A CN100391648C (en) | 2005-05-30 | 2005-05-30 | Method for manufacturing oil pipe in external upset |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1872448A true CN1872448A (en) | 2006-12-06 |
| CN100391648C CN100391648C (en) | 2008-06-04 |
Family
ID=37483141
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100263027A Active CN100391648C (en) | 2005-05-30 | 2005-05-30 | Method for manufacturing oil pipe in external upset |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143669A (en) * | 2012-12-28 | 2013-06-12 | 南通永大管业股份有限公司 | External upsetting method for oil well pipe and oil well pipe manufactured by using external upsetting method |
| CN106378405A (en) * | 2016-11-30 | 2017-02-08 | 河南兴华机械制造有限公司 | Forging and thickening process for end part of pipe body with equal wall thickness |
| CN112676507A (en) * | 2020-12-30 | 2021-04-20 | 天津钢管制造有限公司 | Pipe end thickening and upsetting method suitable for pipeline pipe |
| CN113070438A (en) * | 2021-04-06 | 2021-07-06 | 江阴雷特斯钻具有限公司 | Thickening die and thickening method for drill rod in double-arm drill rod |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174651A (en) * | 2014-07-11 | 2014-12-03 | 太仓新宝谊钢管制造有限公司 | Stainless steel pipe thickening process |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63149038A (en) * | 1986-12-15 | 1988-06-21 | Nippon Steel Corp | Method for working steel pipe end part by outer upsetting press |
| US5184495A (en) * | 1991-12-03 | 1993-02-09 | Prideco, Inc. | Method of internally and externally upsetting the end of a metal tube |
| US5379625A (en) * | 1993-10-20 | 1995-01-10 | Hale; John | Method and apparatus for upsetting the ends of steel pipe |
| US5517843A (en) * | 1994-03-16 | 1996-05-21 | Shaw Industries, Ltd. | Method for making upset ends on metal pipe and resulting product |
| CN1042305C (en) * | 1995-07-11 | 1999-03-03 | 华中理工大学 | Forming technology for hollow sucker rod and mould thereof |
-
2005
- 2005-05-30 CN CNB2005100263027A patent/CN100391648C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103143669A (en) * | 2012-12-28 | 2013-06-12 | 南通永大管业股份有限公司 | External upsetting method for oil well pipe and oil well pipe manufactured by using external upsetting method |
| CN103143669B (en) * | 2012-12-28 | 2015-09-30 | 南通永大管业股份有限公司 | Oil well pipe external upset (EU) method and the oil well pipe using the method to manufacture |
| CN106378405A (en) * | 2016-11-30 | 2017-02-08 | 河南兴华机械制造有限公司 | Forging and thickening process for end part of pipe body with equal wall thickness |
| CN112676507A (en) * | 2020-12-30 | 2021-04-20 | 天津钢管制造有限公司 | Pipe end thickening and upsetting method suitable for pipeline pipe |
| CN113070438A (en) * | 2021-04-06 | 2021-07-06 | 江阴雷特斯钻具有限公司 | Thickening die and thickening method for drill rod in double-arm drill rod |
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| Publication number | Publication date |
|---|---|
| CN100391648C (en) | 2008-06-04 |
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