CN102189189B - High-precision thermal expanding method for high-strength steel pipes - Google Patents
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- CN102189189B CN102189189B CN 201110095139 CN201110095139A CN102189189B CN 102189189 B CN102189189 B CN 102189189B CN 201110095139 CN201110095139 CN 201110095139 CN 201110095139 A CN201110095139 A CN 201110095139A CN 102189189 B CN102189189 B CN 102189189B
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Abstract
The invention discloses a high-precision thermal expanding method for high-strength steel pipes. The method comprises the processing steps of preparation of an expanding machine, furnace heating, thermal expanding, external furnace cooling and stripping. The steel pipes to be expanded are charged into a heating furnace and heated to the temperature of between 600 and 800 DEG C, wherein according to the steel pipes, the tensile strength sigma b is between 1,640 and 2,100MPa, the yielding strength sigma 0.2 is 1,400 to 1,950MPa, the wall thickness is 1 to 10 millimeters, the steel pipes are made of different materials, and the inside diameters of the steel pipes are conical or cylindrical; after expanding, the steel pipes are processed into the high-precision steel pipes, the roundness of which is less than or equal to 0.4 millimeter and the linearity of which is less than or equal to 0.6 millimeters per meter; and the method overcomes the defect that the normal temperature expanding process cannot meet the high-precision expanding requirements of the high-strength steel pipes. The method is suitable for expanding various high-strength steel pipes with different chemical components. The expanded high-strength steel pipes produced by using the method are widely applied in the fields of petroleum and natural gas delivery, aerospace and military affairs.
Description
Technical field
The present invention relates to the hot-working field, be specifically related to a kind of high accuracy thermal expansion method of high tensile steel tube.
Background technology
Expanding machine is at normal temperatures mainly for delivery of hole enlargement school shape and the destressing of the ERW of oil, natural gas.Along with the arrival of China's thing, north and south oil gas big link, submerged pipeline, ore pulp pipeline upsurge in construction, the hole enlargement technology obtains the utmost point as one of operation important in the ERW production and uses widely.Yet other improves along with the steel tubing quality and grade, the increase, particularly Aero-Space of steel pipe thickness and military field be to σ under the room temperature condition
b〉=1640MPa, σ
0.2The hole enlargement of the ultra high strength alloy steel steel pipe of 〉=1400MPa, the normal temperature expanding technology can not satisfy instructions for use.And Aero-Space and military field are also very strict to the required precision of steel pipe, and the normal temperature expanding technology more can not meet the demands.
Summary of the invention
In order to solve the problems of the technologies described above, to the invention provides a kind of use expanding machine and heating furnace and carry out hot-working, the high accuracy thermal expansion method of the high tensile steel tube that procedure of processing is succinct.
The technical scheme that the present invention solves the problems of the technologies described above is: a kind of high accuracy thermal expansion method of high tensile steel tube, and its procedure of processing is:
(1), prepare expanding machine: the graphite spraying emulsion is as lubricant and parting compound on the outer module of expanding machine, and outer module is made by GH4500 material or GH2135 material;
(2), heating in the stove: with tensile strength sigma
bBe 1640MPa～2100MPa, yield strength σ
0.2For 1400MPa～1950MPa and wall thickness 1mm～10mm treat the hole enlargement steel pipe heating furnace of packing into, then in heating furnace, be filled with argon gas, then with Medium frequency induction coil Fast Heating steel pipe to 600 ℃～800 ℃, and under this temperature, be incubated 1～3 minute;
(3), thermal expansion: open Compaction of Heating Furnace Door, with expanding machine reach, the outer module of the expanding machine that has sprayed the graphite emulsion is inserted the steel pipe inner chamber, the operation expanding machine makes outer module motion and extruding steel pipe inner wall, and the steel pipe type that rises carries out thermal expansion;
(4), stove cools off outward: outer module rises after the type hole enlargement, expanding machine retreats, and the state when outer module keeps rising by the type hole enlargement withdraws from from heating furnace with steel pipe, outer module is with the steel pipe air cooling, and the type hole enlargement state that rises in process air cooler between the outer module of maintenance and the steel pipe;
(5), the demoulding: to normal temperature, the operation expanding machine is retracted outer module to outer module with the steel pipe air cooling, break away from steel pipe, the graphite emulsion has guaranteed the smooth demoulding of steel pipe as lubricant and parting compound, precision behind the pipe expanding is: circularity≤0.4mm, linearity≤0.6mm/m.
Technical scheme of the present invention has overcome the defective that high accuracy hole enlargement that the normal temperature expanding technology can not satisfy high tensile steel tube requires.
The beneficial effect that the present invention produces compared to existing technology:
1, the present invention has obviously improved circularity and the linearity of steel pipe, has reached high-precision requirement.
2, the tensile strength sigma of the high tensile steel tube of the present invention's energy hole enlargement
bBe 1640 MPa～2100MPa, yield strength σ
0.2Be 1400MPa～1950MPa, wall thickness 1mm～10mm has opened up the new range of application of hole enlargement high tensile steel tube.
3, the present invention can for the high tensile steel tube hole enlargement with tapering, increase the scope of application with the tapering steel pipe.
4, the high strength after the hole enlargement, high precision steel tube are in Aero-Space and military field, and oil and natural gas conveying aspect all will play an important role.
5, diameter enlarging method of the present invention is succinctly practical, and processing cost is low.
The present invention is applicable to the hole enlargement of the different various high tensile steel tubes of chemical composition.
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Description of drawings
Fig. 1 is functional-block diagram of the present invention.
Fig. 2 is that illustration is implemented in the hole enlargement of the high tensile steel tube of 4 kinds of unlike materials of the present invention.
The specific embodiment
Referring to accompanying drawing 1, a kind of high accuracy thermal expansion method of high tensile steel tube, its procedure of processing is:
(1), prepares expanding machine: become emulsion state with running water dilution graphite, the graphite emulsion is packed in the fluid reservoir of spray gun, spray gun connects the compressed air of 0.3～0.6 MPa, with the automatic or manual spray gun vaporific spraying is carried out on the outer module surface of expanding machine, gun traffic is 40～60 milliliters/second; The graphite spraying emulsion is as lubricant and parting compound on the outer module of expanding machine, and outer module is by GH 4500 materials or GH 2135 material manufacturings.The expanding machine setting in orbit, and is convenient mobile.
(2), heating in the stove: with tensile strength sigma
bBe 1640～2100 MPa, yield strength σ
0.2Be 1400 MPa～1950 MPa, wall thickness is 1mm～10mm, circularity≤5.0mm, linearity≤3.0mm/m treats the hole enlargement steel pipe heating furnace of packing into, then in heating furnace, be filled with argon gas, kept 5～10 minutes, then with Medium frequency induction coil Fast Heating steel pipe to 600 ℃～800 ℃, and under this temperature, be incubated 1～3 minute, the steel pipe in the heating furnace is heated evenly.Be filled with argon gas in the heating furnace, reduced the air concentration in the heating furnace, the oxidation that has occured when having reduced the steel pipe heating.
(3), thermal expansion: open Compaction of Heating Furnace Door, with expanding machine reach, the outer module of the expanding machine that has sprayed the graphite emulsion is inserted the steel pipe inner chamber, the operation expanding machine makes outer module motion and extruding steel pipe inner wall, and the steel pipe type that rises carries out thermal expansion.When thermal expansion, the graphite emulsion forms one deck coating as lubricant between steel pipe and outer module, prevents from wearing and tearing occuring between steel pipe and the outer module and cohering.
(4), stove cools off outward: outer module rises after the type hole enlargement, expanding machine retreats, and the state when outer module keeps rising by the type hole enlargement withdraws from from heating furnace with steel pipe, outer module is with the steel pipe air cooling, and the type hole enlargement state that rises in process air cooler between the outer module of maintenance and the steel pipe.In the pressurize during to normal temperature of steel pipe air cooling, hole enlargement place can be out of shape.
(5), the demoulding: to normal temperature, the operation expanding machine is retracted outer module to outer module with the steel pipe air cooling, break away from steel pipe, the graphite emulsion has guaranteed the smooth demoulding of steel pipe as lubricant and parting compound, precision behind the pipe expanding is: circularity≤0.4mm, linearity≤0.6mm/m; Then transport the steel pipe of finishing hole enlargement with the adapter dolly.
σ
0.2Be 1600MPa, wall thickness is 5mm, pipe diameter φ 395.7mm, length 970mm, circularity≤4.6mm, linearity≤2.6mm/m.
Manual spray gun is to the outer module surface uniform graphite spraying emulsion of expanding machine; Send the pipe dolly that steel pipe is sent into heating furnace, applying argon gas is after 10 minutes, and the 2500Hz heating in medium frequency to 200 ℃, be incubated 5 minutes, the impurity such as removal water vapour and greasy dirt in the room temperature heating 3 minutes.Quickly heated up to 700 ℃ in 4～6 minutes, be incubated stopped heating after 2 minutes, open movable Compaction of Heating Furnace Door, heating furnace will be moved up into before the expanding machine, outer module is inserted steel pipe, and the type that rises expands internal diameter to φ 398mm, and then outer module keeps rising type hole enlargement steel pipe state, withdraw from from heating furnace together, air cooling is to normal temperature.Then outer module is retracted, and breaks away from steel pipe, adopts roller type to take over dolly and is sent from.After testing, behind the T250 pipe expanding, pipe diameter is φ 397.8mm, and enlarging rate is 0.53%, circularity≤0.4mm, linearity≤0.6mm/m.
The external Modular surface graphite spraying of manual spray gun emulsion; Send the pipe dolly that steel pipe is sent into heating furnace, applying argon gas is after 10 minutes, and 3000 Hz heating in medium frequency to 200 ℃, be incubateds 4 minutes in the room temperature heating 2 minutes, and the impurity such as removal water vapour and greasy dirt quickly heated up to 800 ℃ in 5～6 minutes, were incubated 2 minutes, stopped heating.Open movable Compaction of Heating Furnace Door, move up into heating furnace before the expanding machine after, outer module is inserted steel pipe, the type that rises expands internal diameter to microcephaly φ 395.4mm, major part φ 432.4mm, outer module keeps rising type hole enlargement steel pipe state, withdraws from from heating furnace together, air cooling is to normal temperature.Outer module is retracted, and is separated from steel pipe, adopts roller type to take over dolly and is sent from.After testing, internal diameter is microcephaly φ 395.1mm after the hole enlargement of T300 conical steel pipe, and major part φ 432.1mm, enlarging rate are 0.47 ~ 0.51%, circularity≤0.4mm, linearity≤0.6mm/m.
The external Modular surface graphite spraying breast of manual spray gun; Send the pipe dolly that steel pipe is sent into heating furnace, applying argon gas is after 10 minutes, and 2000 Hz heating in medium frequency to 200 ℃, be incubateds 8 minutes, the impurity such as removal water vapour and greasy dirt in the room temperature heating 4 minutes.Quickly heat up to 750 ℃ in 7 minutes, be incubated 2 minutes, stopped heating.Open movable Compaction of Heating Furnace Door, move up into heating furnace before the expanding machine after, outer module is inserted steel pipe, the type that rises expands internal diameter to microcephaly φ 423mm, major part φ 458.1mm.Outer module keeps rising type hole enlargement steel pipe state, withdraws from from heating furnace together, and air cooling is to normal temperature and pressurize.Outer module is retracted, and is separated from steel pipe, adopts roller type to take over dolly and is sent from.After testing, internal diameter is after the conical steel pipe hole enlargement of 16Co14Ni10Cr2Mo: microcephaly φ 422.8mm, major part φ 457.8mm, enlarging rate are 0.55 ~ 0.62%, circularity≤0.4mm, linearity≤0.6mm/m.
Referring to Fig. 2, Fig. 2 is that illustration is implemented in the hole enlargement of the high tensile steel tube of 4 kinds of unlike materials of the present invention, and the material of steel pipe is respectively 18Ni (200), 18Ni (250), 18Ni (300) and G99, their tensile strength sigma
bBetween 1640MPa～2100MPa, yield strength σ
0.2Between 1400MPa～1950MPa, wall thickness is in 1mm～10mm scope, and after testing, they have all reached circularity≤0.4mm, the high-precision requirement of linearity≤0.6mm/m after hole enlargement.
Claims (1)
1. the high accuracy thermal expansion method of a high tensile steel tube, it is characterized in that: its procedure of processing is:
(1), prepare expanding machine: the graphite spraying emulsion is as lubricant and parting compound on the outer module of expanding machine, and outer module is made by GH4500 material or GH2135 material;
(2), heating in the stove: with tensile strength sigma
bBe 1640MPa～2100MPa, yield strength σ
0.2Be 1400MPa～1950MPa and wall thickness 1mm～10mm, circularity≤5.0mm, linearity≤3.0mm/m treats the hole enlargement steel pipe heating furnace of packing into, then is filled with argon gas in heating furnace, then with Medium frequency induction coil Fast Heating steel pipe to 600 ℃～800 ℃, and under this temperature, be incubated 1～3 minute;
(3), thermal expansion: open Compaction of Heating Furnace Door, with expanding machine reach, the outer module of the expanding machine that has sprayed the graphite emulsion is inserted the steel pipe inner chamber, the operation expanding machine makes outer module motion and extruding steel pipe inner wall, and the steel pipe type that rises carries out thermal expansion;
(4), stove cools off outward: outer module rises after the type hole enlargement, expanding machine retreats, and the state when outer module keeps rising by the type hole enlargement withdraws from from heating furnace with steel pipe, outer module is with the steel pipe air cooling, and the type state that rises in process air cooler between the outer module of maintenance and the steel pipe;
(5), the demoulding: to normal temperature, the operation expanding machine is retracted outer module to outer module with the steel pipe air cooling, break away from steel pipe, the graphite emulsion has guaranteed the smooth demoulding of steel pipe as lubricant and parting compound, precision behind the pipe expanding is: circularity≤0.4mm, linearity≤0.6mm/m.
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| CN102489593B (en) * | 2011-11-24 | 2014-04-02 | 贵州安大航空锻造有限责任公司 | Hot bulge forming method for aluminum-alloy flash buttwelding ring components |
| CN102489598B (en) * | 2011-11-24 | 2014-04-02 | 贵州安大航空锻造有限责任公司 | Thermal bulging process for special-shaped bearing steel rolled ring workpieces |
| CN102489597B (en) * | 2011-11-24 | 2014-04-02 | 贵州安大航空锻造有限责任公司 | Hot bulging method for rectangular bearing steel rolled ring |
| CN104550516B (en) * | 2014-12-15 | 2016-07-06 | 南京航空航天大学 | The cold expanding method for aligning of steel pipe |
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| JPS62156031A (en) * | 1985-12-26 | 1987-07-11 | Kawasaki Steel Corp | Production of metallic tube having connection part |
| CN1093444C (en) * | 1999-07-23 | 2002-10-30 | 广州南方管道有限公司 | Process for expanding end of large diameter thick wall steel pipe |
| CN1954933A (en) * | 2005-10-26 | 2007-05-02 | 竭国忠 | Equipment and method for manufacturing metal large diameter equal wall thickness slit elbow and expanding tube by thermal push |
| CN101468364A (en) * | 2007-12-29 | 2009-07-01 | 付朋 | Thermal expansion machine for producing stainless steel tube |
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Effective date of registration: 20190606 Address after: 411300 East of Lianhua Road and South of Xinyang Road, Shaoshan High-tech Industrial Development Zone, Xiangtan City, Hunan Province Patentee after: Xiangtan Huajin Heavy Loading Co.,Ltd. Address before: 411300 Shaoshan High-tech Industrial Development Zone, Xiangtan City, Hunan Province Patentee before: XIANGTAN HUAJIN TECHNOLOGY CO.,LTD. |
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Address after: 411300 East of Lianhua Road and South of Xinyang Road, Shaoshan High-tech Industrial Development Zone, Xiangtan City, Hunan Province Patentee after: Xiangtan Huajin Heavy Equipment Technology Co.,Ltd. Address before: 411300 East of Lianhua Road and South of Xinyang Road, Shaoshan High-tech Industrial Development Zone, Xiangtan City, Hunan Province Patentee before: Xiangtan Huajin Heavy Loading Co.,Ltd. |
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