CN104128386B - A kind of device of high-pressure liquid jet Plastic Forming composite bimetal pipe and technique - Google Patents
A kind of device of high-pressure liquid jet Plastic Forming composite bimetal pipe and technique Download PDFInfo
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- CN104128386B CN104128386B CN201410373292.3A CN201410373292A CN104128386B CN 104128386 B CN104128386 B CN 104128386B CN 201410373292 A CN201410373292 A CN 201410373292A CN 104128386 B CN104128386 B CN 104128386B
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Abstract
A kind of device of high-pressure liquid jet Plastic Forming composite bimetal pipe and technique, device comprises multiple tube horizontally moving device, the base of multiple tube horizontally moving device is provided with high-pressure liquid jet device and whirligig, whirligig can be rotated by energizes high-pressure liquid injection apparatus, in the steel outer tube of multiple tube and stainless steel, pipe is fixed on multiple tube bracing or strutting arrangement after being clamped by composite pipe clamping device, multiple tube bracing or strutting arrangement and oil-water collecting device are all connected on multiple tube horizontally moving device, and can realize moving horizontally under the effect of multiple tube horizontally moving device, during work, the hydraulic oil aqueous mixtures that rotates be injected in can in the stainless steel of moving linearly pipe inwall on, make it produce plastic deformation and produce certain elastic deformation on steel outer tube, thus inner and outer pipes is combined closely form the composite bimetal pipe of good quality.
Description
Technical field
The invention belongs to composite bimetal pipe forming technique field, especially relate to a kind of device and technique of high-pressure liquid jet Plastic Forming composite bimetal pipe.
Background technology
Growing along with world energy sources demand, exploitation of oil-gas field is gradually to deep-well, high corrosive environment future development, and use corrosion resistant alloy multiple tube to be solve the comparatively safe and economic effective means of oil-gas pipeline corrosion problem, for improving the corrosion resistance of steel pipe, composite bimetal pipe material arises at the historic moment.With traditional single metal material ratio, composite bimetal pipe material has high strength, high rigidity, the performance such as corrosion-resistant, result of use is excellent, conveying gas-liquid mixture is had wide practical use, so international, domestic market all starts to vigorously promote the use, and achieves good practical application effect now.
Composite bimetal pipe is made up of two kinds of different metal pipe materials: a kind of tubing is interior, and outside, formed by various distortion and interconnection technique between tube layer and combine closely, during by External Force Acting, inside and outside tubing is out of shape another kind of tubing simultaneously and interface is not separated.At present, home and abroad dual-metal clad steel pipe technique achieves and develops on a large scale very much, and particularly the national development such as Japan, the U.S., Britain, Russia is very fast.Main employing have the methods such as nested type, welded type, outer cladding formula, laser cladding compound, explosion type compound.Along with the development of China Petroleum, the Larger Engineering Projects such as transfering natural gas from the west to the east are constantly carried out, and the demand of composite bimetal pipe is huge, have good market prospects.But China's composite bimetal pipe is started late, in current industry, technology still depends on developed countries prior art, comparatively lacks for products innovation technology.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of device and technique of high-pressure liquid jet Plastic Forming composite bimetal pipe, the composite bimetal pipe of function admirable can be prepared by this building mortion.
In order to achieve the above object, the present invention takes following technical scheme:
A kind of device of high-pressure liquid jet Plastic Forming composite bimetal pipe, comprise multiple tube horizontally moving device 1, the base of multiple tube horizontally moving device 1 is provided with high-pressure liquid jet device 2 and whirligig 3, whirligig 3 energizes high-pressure liquid injection apparatus 2 is rotated, in the steel outer tube 71 of multiple tube 7 and stainless steel, pipe 72 is fixed on multiple tube bracing or strutting arrangement 5 after being clamped by composite pipe clamping device 4, multiple tube bracing or strutting arrangement 5 and fluid collection device 6 are all connected on multiple tube horizontally moving device 1, and can realize moving horizontally under the effect of multiple tube horizontally moving device 1.
Described multiple tube horizontally moving device 1 comprises base 10, base 10 lower end is processed with oil pocket 100 and oil pocket hole 101, base 10 is equipped with the first motor 11, the output shaft of the first motor 11 is connected with shaft coupling 12, the other end of shaft coupling 12 is connected with leading screw 13, the other end of leading screw 13 is equipped with screw lead supporting device 16, screw lead supporting device 16 is connected on base 10, leading screw 13 is equipped with feed screw nut 15, attaching nut's moving platform 14 outside feed screw nut 15, the both sides of nut moving platform 14 are fixed with guide rail slide block 18, guide rail slide block 18 and guide rail 17 coordinate, guide rail 17 is fixed on base 10.
Described high-pressure liquid jet device 2 comprises chicksan 20, one end of chicksan 20 passes into high-voltage high-speed liquid, the other end is threaded connection on swivelling pipe 22, swivelling pipe 22 one end is supported on base 10 by clutch shaft bearing 21, the other end of swivelling pipe 22 is threaded connection part 23 and links together with steel pipe 24, the other end of steel pipe 24 is threaded connection part 23 and links together with high-pressure liquid jet pipe 25, the outside of high-pressure liquid jet pipe 25 has been threaded connection binding nut 26, the outside of binding nut 26 is combined with support set 27, the outside of support set 27 is combined with not containing the second bearing 29 of bearing outer ring, the both sides of the second bearing 29 are first circlips 28.
Described whirligig 3 comprises the motor mounting plate 300 be connected on base 10, the second motor 301 motor mounting plate 300 is equipped with, the output shaft of the second motor 301 is connected with the first belt wheel 305, there is the axle end baffle plate 303 for carrying out axial location to the first belt wheel 305 end of the output shaft of the second motor 301, first belt wheel 305 is connected with the second belt wheel 309 by Timing Belt 306, second belt wheel 309 is connected on swivelling pipe 22 by the second key 307, there are sleeve 310 and the second circlip 308 for carrying out axial location to the second belt wheel 309 in the both sides of the second belt wheel 309.
Described composite pipe clamping device 4 comprises clamping ring 41, clamping ring 41 outside is evenly equipped with second bolt 42 of more than three, during work, by tightening the clamping action that the second bolt 42 realizes pipe 72 in steel outer tube 71 and stainless steel, and clamping ring 41 and the place contacted with the second bolt 42 outside steel outer tube 71 are all milled with platform in local.
A technique for high-pressure liquid jet Plastic Forming composite bimetal pipe, comprises the following steps:
1) composite bimetal pipe clamping, the place that screwed hole on the steel outer tube 71 of multiple tube 7 and the clamping ring 41 of composite pipe clamping device 4 is relative is milled with the platform that radius is a bit larger tham tapped bore, the place of simultaneously opening screwed hole in the outside of clamping ring 41 is also milled with platform, utilizes and carries out clamping at outside uniform the second bolt 42 pairs of steel pipes 81 of clamping ring 41 and stainless steel tube 82;
2) porch to the chicksan 20 of high-pressure liquid jet device 2 passes into highly pressurised liquid, this highly pressurised liquid will flow through swivelling pipe 22, the inwall of length-adjustable steel pipe and the rear high velocity jet pipe 72 in stainless steel of high-pressure liquid jet pipe 25 make it produce local plastic deformation, and elastic deformation is produced on steel outer tube 71, then AEI After End of Injection, generation is combined closely by injected place, the liquid completing injection will flow under the influence of gravity in fluid collection device 6, and flow in the oil pocket 100 of base 10 by the flexible pipe of fluid collection device 6, oil pocket hole 101 eventually through base 10 is discharged, can be recycled after filtering,
3) whirligig 3 is opened, rotated by whirligig 3 driven rotary pipe 22, swivelling pipe 22 one end connects chicksan 20 and realizes rotating freely, the steel pipe that other end connecting length is adjustable and high-pressure liquid jet pipe 25, then energizes high-pressure Liquid inject pipe 25 rotates, until the liquid flowing through high-pressure liquid jet pipe 25 pipe 72 and steel outer tube 71 will produce the uniform plastic deformation of circle and an elastic deformation in stainless steel;
4) multiple tube horizontally moving device 1 is opened, multiple tube bracing or strutting arrangement 5 moving linearly is driven by multiple tube horizontally moving device 1, and then drive pipe 72 and steel outer tube 71 moving linearly in the stainless steel that clamped by composite pipe clamping device 4, until the next one entering pipe 72 and steel outer tube 71 in stainless steel position to be formed;
5) repeat to open pipe 72 and steel outer tube 71 in whirligig 3 and multiple tube horizontally moving device 1 pair of stainless steel and carry out the progressive and axial progressive combined shaping of circumference, until complete the progressive plastic combined shaping of whole multiple tube, and the final multiple tube 7 forming good quality.
Relative to prior art, the invention provides a kind of device and technique of high-pressure liquid jet Plastic Forming composite bimetal pipe, the inwall spraying pipe in composite bimetal pipe that can to realize highly pressurised liquid evenly, at a high speed by this device make it produce plastic deformation, and certain elastic deformation is produced on the outer tube of composite bimetal pipe, thus inner and outer pipes is combined closely and forms the high composite bimetal pipe of quality, in addition, the present invention also has the following advantages:
1, in the present invention, the steel pipe length of high-pressure liquid jet device can be regulated by the number of control threaded connector joint steel pipe quantity, thus can realize the high-pressure liquid jet Plastic Forming for different length multiple tube;
2, in the present invention, by changing the high-pressure liquid jet pipe of different openings size, the high-pressure liquid jet Plastic Forming for different tube diameters multiple tube can be realized.
3, structure is simple, operating aspect, forming efficiency are high.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the A direction view of multiple tube horizontally moving device 1 in Fig. 1.
Fig. 3 be in Fig. 2 multiple tube horizontally moving device at the partial sectional view at B-B place.
Fig. 4 is the partial enlarged view of high-pressure liquid jet pipe 25.
Fig. 5 is the structural representation of high-pressure liquid jet device 2.
Fig. 6 is the zoomed-in view of whirligig 3.
Fig. 7 is the schematic diagram of composite pipe clamping device 4, and wherein scheming a is the partial enlarged view of composite pipe clamping device 4, figure b be composite pipe clamping device 4 C-C to sectional view.
Partial enlarged view when Fig. 8 is the shaping of multiple tube high compactibility.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
With reference to Fig. 1, a kind of device of high-pressure liquid jet Plastic Forming composite bimetal pipe, comprise multiple tube horizontally moving device 1, the base of multiple tube horizontally moving device 1 is provided with high-pressure liquid jet device 2 and whirligig 3, whirligig 3 energizes high-pressure liquid injection apparatus 2 is rotated, in the steel outer tube 71 of multiple tube 7 and stainless steel, pipe 72 is fixed on multiple tube bracing or strutting arrangement 5 after being clamped by composite pipe clamping device 4, multiple tube bracing or strutting arrangement 5 and fluid collection device 6 are all connected on multiple tube horizontally moving device 1, and can realize moving horizontally under the effect of multiple tube horizontally moving device 1.
With reference to Fig. 1, Fig. 2 and Fig. 3, described multiple tube horizontally moving device 1 comprises base 10, base 10 lower end is processed with oil pocket 100 and oil pocket hole 101, base 10 is equipped with the first motor 11, the output shaft of the first motor 11 is connected with shaft coupling 12, the other end of shaft coupling 12 is connected with leading screw 13, the other end of leading screw 13 is equipped with screw lead supporting device 16, screw lead supporting device 16 is connected on base 10, leading screw 13 is equipped with feed screw nut 15, attaching nut's moving platform 14 outside feed screw nut 15, the both sides of nut moving platform 14 are fixed with guide rail slide block 18, guide rail slide block 18 and guide rail 17 coordinate, guide rail 17 is fixed on base 10.
With reference to Fig. 4 and Fig. 5, described high-pressure liquid jet device 2 comprises chicksan 20, one end of chicksan 20 passes into high-voltage high-speed liquid, the other end is threaded connection on swivelling pipe 22, swivelling pipe 22 one end is supported on base 10 by clutch shaft bearing 21, the other end of swivelling pipe 22 is threaded connection part 23 and links together with steel pipe 24, the other end of steel pipe 24 is threaded connection part 23 and links together with high-pressure liquid jet pipe 25, the outside of high-pressure liquid jet pipe 25 has been threaded connection binding nut 26, the outside of binding nut 26 is combined with support set 27, the outside of support set 27 is combined with not containing the second bearing 29 of bearing outer ring, the both sides of the second bearing 29 are first circlips 28.
With reference to Fig. 6, described whirligig 3 comprises the motor mounting plate 300 be connected on base 10, the second motor 301 motor mounting plate 300 is equipped with, the output shaft of the second motor 301 is connected with the first belt wheel 305 by the first key 302, there is the axle end baffle plate 303 for carrying out axial location to the first belt wheel 305 end of the output shaft of the second motor 301, and axle end baffle plate 303 is undertaken fastening by the first bolt 304, first belt wheel 305 is connected with the second belt wheel 309 by Timing Belt 306, second belt wheel 309 is connected on swivelling pipe 22 by the second key 307, there are sleeve 310 and the second circlip 308 for carrying out axial location to the second belt wheel 309 in the both sides of the second belt wheel 309.
With reference to Fig. 7, described whirligig 3 comprises the motor mounting plate 300 be connected on base 10, the second motor 301 motor mounting plate 300 is equipped with, the output shaft of the second motor 301 is connected with the first belt wheel 305 by the first key 302, there is the axle end baffle plate 303 for carrying out axial location to the first belt wheel 305 end of the output shaft of the second motor 301, and axle end baffle plate 303 is undertaken fastening by the first bolt 304, first belt wheel 305 is connected with the second belt wheel 309 by Timing Belt 306, second belt wheel 309 is connected on swivelling pipe 22 by the second key 307, there are sleeve 310 and the second circlip 308 for carrying out axial location to the second belt wheel 309 in the both sides of the second belt wheel 309.
A technique for high-pressure liquid jet Plastic Forming composite bimetal pipe, comprises the following steps:
1) with reference to Fig. 1, Fig. 7 and Fig. 8, composite bimetal pipe clamping, the place that screwed hole on the steel outer tube 71 of multiple tube 7 and the clamping ring 41 of composite pipe clamping device 4 is relative is milled with the platform that radius is a bit larger tham tapped bore, the place of simultaneously opening screwed hole in the outside of clamping ring 41 is also milled with platform, utilizes and carries out clamping at outside uniform 6 the second bolts, the 42 pairs of steel pipes 81 of clamping ring 41 and stainless steel tube 82;
2) with reference to Fig. 1 and Fig. 4, porch to the chicksan 20 of high-pressure liquid jet device 2 passes into the liquid of high-voltage high-speed, this high-voltage high-speed liquid will flow through swivelling pipe 22, the inwall being injected in pipe 72 in stainless steel after length-adjustable steel pipe and high-pressure liquid jet pipe 25 make it produce local plastic deformation, and elastic deformation is produced on steel outer tube 71, then AEI After End of Injection, generation is combined closely by injected place, the liquid completing injection will flow under the influence of gravity in fluid collection device 6, and flow in the oil pocket 100 of base 10 by the flexible pipe of fluid collection device 6, oil pocket hole 101 eventually through base 10 is discharged, can be recycled after filtering,
3) with reference to Fig. 1, Fig. 6, Fig. 4 and Fig. 8, open whirligig 3, rotated by whirligig 3 driven rotary pipe 22, swivelling pipe 22 one end connects chicksan 20 and realizes rotating freely, the steel pipe that other end connecting length is adjustable and high-pressure liquid jet pipe 25, then energizes high-pressure Liquid inject pipe 25 rotates, until the liquid flowing through high-pressure liquid jet pipe 25 pipe 72 and steel outer tube 71 will produce the uniform plastic deformation of circle and an elastic deformation in stainless steel;
4) with reference to Fig. 1, Fig. 2 and Fig. 8, open multiple tube horizontally moving device 1, multiple tube bracing or strutting arrangement 5 moving linearly is driven by multiple tube horizontally moving device 1, and then drive pipe 72 and steel outer tube 71 moving linearly in the stainless steel that clamped by composite pipe clamping device 4, until the next one entering pipe 72 and steel outer tube 71 in stainless steel position to be formed;
5) with reference to Fig. 1, repeat to open pipe 72 and steel outer tube 71 in whirligig 3 and multiple tube horizontally moving device 1 pair of stainless steel and carry out the progressive and axial progressive combined shaping of circumference, until complete the progressive plastic combined shaping of whole multiple tube, and the final multiple tube 7 forming good quality.
The length-adjustable principle of the steel pipe of high-pressure liquid jet device is: with reference to Fig. 4, one end of steel pipe 24 is threaded connection part 23 and links together with swivelling pipe 2, the other end of steel pipe 24 is threaded connection part 23 and links together with high-pressure liquid jet pipe 25, therefore the quantity by increasing or reduce steel pipe 24 and threaded connector 23 realizes the adjustment of the length of the steel pipe of high-pressure liquid jet device.
The operation principle of whirligig 3 is: with reference to Fig. 1 and Fig. 6, the rotary motion of the second motor 301 is converted to the rotary motion of swivelling pipe 22 by the belt wheel transmission system be made up of the first belt wheel 305, Timing Belt 306 and the second belt wheel 309, and the diameter of the first belt wheel 305 is less than the diameter of the second belt wheel 309, and then being rotated in deceleration of high-pressure liquid jet pipe 25 can be realized.
The operation principle of multiple tube horizontally moving device 1 is: with reference to Fig. 1, Fig. 2 and Fig. 3, the rotary motion of the first motor 11 is converted to the rectilinear motion of nut moving platform 14 by the screw nut device be made up of shaft coupling 12, leading screw 13, feed screw nut 15 and bearing spider 16, and the direction of the rectilinear motion of nut moving platform 14 is subject to the restriction of guide rail slide block 18 along guide rail 17 movement that be connected with it, the rectilinear motion of nut moving platform 14 will drive moving horizontally of multiple tube.
Claims (2)
1. the device of a high-pressure liquid jet Plastic Forming composite bimetal pipe, comprise multiple tube horizontally moving device (1), it is characterized in that: the base of multiple tube horizontally moving device (1) is provided with high-pressure liquid jet device (2) and whirligig (3), whirligig (3) energizes high-pressure liquid injection apparatus (2) is rotated, the steel outer tube (71) of multiple tube (7) and stainless steel interior pipe (72) are fixed on multiple tube bracing or strutting arrangement (5) after composite pipe clamping device (4) clamping, multiple tube bracing or strutting arrangement (5) and fluid collection device (6) are all connected on multiple tube horizontally moving device (1), and realization can move horizontally under the effect of multiple tube horizontally moving device (1),
Described multiple tube horizontally moving device (1) comprises base (10), base (10) lower end is processed with oil pocket (100) and oil pocket hole (101), base (10) is equipped with the first motor (11), the output shaft of the first motor (11) is connected with shaft coupling (12), the other end of shaft coupling (12) is connected with leading screw (13), the other end of leading screw (13) is equipped with screw lead supporting device (16), screw lead supporting device (16) is connected on base (10), leading screw (13) is equipped with feed screw nut (15), feed screw nut (15) outside attaching nut's moving platform (14), the both sides of nut moving platform (14) are fixed with guide rail slide block (18), guide rail slide block (18) and guide rail (17) coordinate, guide rail (17) is fixed on base (10),
Described high-pressure liquid jet device (2) comprises chicksan (20), one end of chicksan (20) passes into high-voltage high-speed liquid, the other end is threaded connection on swivelling pipe (22), swivelling pipe (22) one end is supported on base (10) by clutch shaft bearing (21), the other end of swivelling pipe (22) is threaded connection part (23) and links together with steel pipe (24), the other end of steel pipe (24) is threaded connection part (23) and links together with high-pressure liquid jet pipe (25), the outside of high-pressure liquid jet pipe (25) has been threaded connection binding nut (26), the outside of binding nut (26) is combined with support set (27), the outside of support set (27) is combined with not containing second bearing (29) of bearing outer ring, the both sides of the second bearing (29) are the first circlip (28),
Described whirligig (3) comprises the motor mounting plate (300) be connected on base (10), the second motor (301) motor mounting plate (300) is equipped with, the output shaft of the second motor (301) is connected with the first belt wheel (305), there is the axle end baffle plate (303) for carrying out axial location to the first belt wheel (305) end of the output shaft of the second motor (301), first belt wheel (305) is connected with the second belt wheel (309) by Timing Belt (306), second belt wheel (309) is connected on swivelling pipe (22) by the second key (307), there are sleeve (310) and the second circlip (308) for carrying out axial location to the second belt wheel (309) in the both sides of the second belt wheel (309),
Described composite pipe clamping device (4) comprises clamping ring (41), clamping ring (41) outside is evenly equipped with second bolt (42) of more than three, during work, realize steel outer tube (71) and the interior clamping action of managing (72) of stainless steel by tightening the second bolt (42), and the place that clamping ring (41) and steel outer tube (71) outside contact with the second bolt (42) is all milled with platform in local.
2. the forming technology of device according to claim 1, is characterized in that, comprises the following steps:
1) composite bimetal pipe clamping, the place that screwed hole on the steel outer tube (71) of multiple tube (7) and the clamping ring (41) of composite pipe clamping device (4) is relative is milled with the platform that radius is a bit larger tham tapped bore, the place of simultaneously opening screwed hole in the outside of clamping ring (41) is also milled with platform, utilizes and carries out clamping at outside uniform the second bolt (42) of clamping ring (41) to steel pipe (81) and stainless steel tube (82);
2) liquid of high-voltage high-speed is passed into the porch of the chicksan (20) of high-pressure liquid jet device (2), this high-voltage high-speed liquid will flow through swivelling pipe (22), the inwall being injected in pipe (72) in stainless steel after length-adjustable steel pipe and high-pressure liquid jet pipe (25) make it produce local plastic deformation, and elastic deformation is produced on steel outer tube (71), then AEI After End of Injection, generation is combined closely by injected place, the liquid completing injection will flow under the influence of gravity in fluid collection device (6), and flow in the oil pocket (100) of base (10) by the flexible pipe of fluid collection device (6), oil pocket hole (101) eventually through base (10) is discharged, can be recycled after filtering,
3) whirligig (3) is opened, rotated by whirligig (3) driven rotary pipe (22), swivelling pipe (22) one end connects chicksan (20) and realizes rotating freely, the steel pipe that other end connecting length is adjustable and high-pressure liquid jet pipe (25), then energizes high-pressure Liquid inject pipe (25) rotates, until the liquid flowing through high-pressure liquid jet pipe (25) will manage (72) in stainless steel and uniform plastic deformation and elastic deformation are enclosed in the upper generation one of steel outer tube (71);
4) multiple tube horizontally moving device (1) is opened, multiple tube bracing or strutting arrangement (5) moving linearly is driven by multiple tube horizontally moving device (1), and then drive the interior pipe of stainless steel (72) and steel outer tube (71) moving linearly that are clamped by composite pipe clamping device (4), until enter the next one position to be formed of pipe (72) and steel outer tube (71) in stainless steel;
5) repeat to open whirligig (3) and multiple tube horizontally moving device (1) carries out the progressive and axial progressive combined shaping of circumference to pipe (72) and steel outer tube (71) in stainless steel, until complete the progressive plastic combined shaping of whole multiple tube, and finally form multiple tube (7).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410373292.3A CN104128386B (en) | 2014-07-31 | 2014-07-31 | A kind of device of high-pressure liquid jet Plastic Forming composite bimetal pipe and technique |
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| CN201410373292.3A CN104128386B (en) | 2014-07-31 | 2014-07-31 | A kind of device of high-pressure liquid jet Plastic Forming composite bimetal pipe and technique |
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| CN104128386A CN104128386A (en) | 2014-11-05 |
| CN104128386B true CN104128386B (en) | 2015-12-02 |
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| CN201410373292.3A Expired - Fee Related CN104128386B (en) | 2014-07-31 | 2014-07-31 | A kind of device of high-pressure liquid jet Plastic Forming composite bimetal pipe and technique |
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| CN108890263B (en) * | 2018-08-22 | 2024-02-23 | 江苏众信绿色管业科技有限公司 | Equipment for assembling steel lining composite pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57130790A (en) * | 1981-02-04 | 1982-08-13 | Kawasaki Heavy Ind Ltd | Method and apparatus for manufacturing double tube |
| US4449281A (en) * | 1982-03-16 | 1984-05-22 | Kawasaki Jukogyo Kabushiki Kaisha | Method of producing multiple-wall, composite tubular structures |
| JPS62101328A (en) * | 1985-10-30 | 1987-05-11 | Kawasaki Heavy Ind Ltd | Double pipe producing method |
| CN1215914C (en) * | 2002-09-14 | 2005-08-24 | 大庆油田创业金属防腐有限公司 | Technical method for hardness adhibition wall of steel and stainless steel liner tube |
| ITRA20080010A1 (en) * | 2008-03-05 | 2009-09-06 | Be Ca Engineering Societa Coop | METHOD AND MEANS FOR THE IMPLEMENTATION OF BIMETAL TUBES. |
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