CN111421044A - Preparation process of low-strength base pipe composite elastic liner pipe and composite pipe - Google Patents
Preparation process of low-strength base pipe composite elastic liner pipe and composite pipe Download PDFInfo
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- CN111421044A CN111421044A CN202010289032.3A CN202010289032A CN111421044A CN 111421044 A CN111421044 A CN 111421044A CN 202010289032 A CN202010289032 A CN 202010289032A CN 111421044 A CN111421044 A CN 111421044A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
- B21C3/02—Dies; Selection of material therefor; Cleaning thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention relates to a pipe preparation process of a low-strength base pipe composite elastic liner pipe and a composite pipe, and belongs to the technical field of composite pipe preparation. The preparation process comprises the following steps: firstly, a cold deformation process is adopted to act on the inner wall of a liner tube, so that the diameter of the liner tube is expanded, and the liner tube is attached to the inner wall of a base tube; and then acting on the outer wall of the base pipe by adopting a cold deformation process to reduce the diameter of the base pipe to obtain the composite pipe. The composite pipe prepared by the application has higher clamping strength and can meet the use requirement.
Description
Technical Field
The invention relates to the technical field of composite pipe preparation, in particular to a pipe preparation process of a low-strength base pipe composite elastic liner pipe and a composite pipe.
Background
The bimetal composite pipe is a composite material pipeline composed of two metals, a base pipe on the outer surface is composed of a high-strength material, typical materials are high-strength pipeline steel such as X52 and X65, the liner pipe material in the bimetal composite pipe is composed of corrosion-resistant alloy materials such as 316L and N08825, and the two pipes have good mechanical property and corrosion resistance after being nested.
The metal composite pipe is prepared by adopting a hot expansion and cold contraction composite process and a hot penetration caterpillar composite process in the prior art, for example, the caterpillar metal composite pipe manufacturing process disclosed in the Chinese patent application publication No. CN 106140864A, and has the advantages of being capable of being realized on a steel rolling production line of a steel mill, not needing to add equipment, being simple to manufacture, low in cost and convenient to popularize.
However, the inventor finds that the bi-metal composite pipe using the dual-phase steel as the lining pipe is prepared by using a mechanical compounding process, and has the problems that ① dual-phase steel has high strength, the yield strength of the bi-phase steel is 400-550 MPa and is usually more than 2 times of 316L stainless steel, the plasticity of ② dual-phase steel is poor, the plastic elongation is only 15-25 percent and is only 40-60 percent of 316L stainless steel, and therefore, when the dual-phase steel composite pipe is prepared by using a method for changing the lining pipe by adopting water pressure, rolling, explosion, drawing and the like, after the processing is finished, the lining pipe of the composite pipe is difficult to be compounded with the base pipe, a large gap still exists between the lining pipe and the base pipe, a good compounding effect cannot be achieved, the product performance is poor, and the.
Disclosure of Invention
Aiming at the problems, the application mainly aims to enable the prepared composite pipe to meet the use requirement and have enough high clamping strength, and develops a pipe preparation process of a low-strength base pipe composite elastic liner pipe and the composite pipe.
The technical scheme for solving the problems is as follows:
the preparation process of the pipe with the low-strength base pipe and the composite elastic liner pipe comprises the following steps:
firstly, a cold deformation process is adopted to act on the inner wall of a liner tube, so that the diameter of the liner tube is expanded, and the liner tube is attached to the inner wall of a base tube;
and then acting on the outer wall of the base pipe by adopting a cold deformation process to reduce the diameter of the base pipe to obtain the composite pipe.
So-called liner pipes, i.e. pipes located inside in composite pipes; the base pipe is a pipe fitting located on the outer side in the composite pipe, and the base pipe is coated on the outer side surface of the liner pipe to form the composite pipe.
The invention enhances the bonding strength of the liner tube and the base tube by respectively aiming at the preparation processes of the liner tube and the base tube by cold deformation twice, so that the clamping strength of the finished composite tube meets the use requirement.
Specifically, the elastic liner tube is often low in plasticity, and after the cold deformation process is expanded, the elastic liner tube is usually kept in an elastic deformation stage, namely, the rebound phenomenon is likely to occur, so that a gap is formed between the elastic liner tube and the inner wall of the base tube, the base tube with low strength is subjected to cold deformation reducing treatment, and pressure is applied from outside to inside to reduce the diameter so as to eliminate the gap between the liner tube and the base tube, so that the composite effect of the elastic liner tube meets the use requirement.
Preferably, the preparation process comprises the following steps:
① nesting, namely nesting the liner inside the base pipe;
② water pressure compounding, namely performing primary attaching operation on the outer wall of the liner tube and the inner wall of the base tube through water pressure to prepare a primary compound tube;
③ primary cutting and welding, namely, partially cutting off the end part of the primary composite pipe and welding the cut end part;
④, cold drawing, namely, cold drawing the primary composite pipe obtained in the step ③ to obtain a secondary composite pipe;
⑤ secondary cutting and welding, wherein the end of the secondary composite pipe is partially cut off and the cut end is welded;
⑥, rounding and fine boring, namely rounding and fine boring the secondary composite pipe obtained in the step ⑤ to obtain the composite pipe.
Specifically, the elasticity bushing pipe still probably has the resilience phenomenon after the water pressure is compound, leads to appearing the gap between the inner wall of its and parent tube, consequently, after first excision welding step, need carry out cold drawing to first compound tubular product, outside-in is exerted pressure and is carried out the reducing in order to eliminate the gap between bushing pipe and the parent tube, makes its compound effect reach operation requirement.
Preferably, in step ④, the primary composite pipe is subjected to cold drawing and then straightened to obtain a secondary composite pipe.
Preferably, in step ⑤, the cut end portion is subjected to a build-up welding process.
From the microscopic view, a certain gap is formed between two layers of the mechanical composite pipe, and in order to prevent external water vapor or impurities from entering between two layers of metal in the future, the end part needs to be sealed, and the mode generally adopted is seal welding or surfacing welding.
The sealing welding has the advantages of rapidness and the defects that the inner diameter can not be controlled for subsequent machining, and the reverse side of the molten pool is a heat affected zone which is in contact with the used fluid and has adverse effect on the corrosion prevention effect in the future.
The surfacing welding has the advantages that the surfacing welding with a certain length is beneficial to cutting and repairing of on-site butt joint, can facilitate subsequent internal boring machining to obtain a smaller range of internal diameter tolerance, and after two-layer welding, the second layer of welding seam is minimally diluted by a base body and is in contact with fluid in the future, so that the surfacing welding has better corrosion resistance.
Preferably, after the step ⑥, the method further includes a step ⑦ of detecting that the composite pipe obtained in the step ⑥ is detected and demagnetized to obtain a finished composite pipe.
The detecting step may comprise X-ray detection, ultrasonic detection or liquid penetration detection.
Preferably, the liner tube is made of a material having a plastic elongation of less than 25%.
Further preferably, the liner tube is made of a dual-phase steel material, and can be low-alloy dual-phase steel, medium-alloy dual-phase steel, high-alloy dual-phase steel, or super dual-phase steel.
Preferably, the base pipe is made of a material with yield strength less than 450 MPa.
When the yield strength of the base pipe is too high, the base pipe is not easy to deform in the cold drawing stage, and the gap between the base pipe and the liner pipe is not easy to compound, so that the performance of the finished composite pipe is influenced.
Further preferably, the base pipe is a carbon steel pipe, and can be made of 10 # steel, 15 # steel, 20# steel or 25 # steel.
Preferably, in step ②, the liner tube has a deformation of no more than 5.0% and a diameter reduction of no more than 4.0 mm.
For the elastic liner tube, the plasticity is often lower, when the deformation and the reducing quantity exceed a certain value, the elastic deformation is easy to be converted into the plastic deformation, the mechanical property of the elastic liner tube can be reduced in different degrees, the subsequent cold drawing operation is not facilitated, and the quality of the finished composite tube can be reduced.
Preferably, in step ③, the soldering is performed with the same solder as the substrate tube, or with a solder close to the substrate tube, so that the solder and the substrate tube material are fused as soon as possible, and the soldering effect is better.
Preferably, in step ④, the deformation of the substrate tube is not more than 2.5% and the diameter reduction is not more than 4mm during the cold drawing process.
In the cold drawing process, when the deformation or the diameter reduction of the base pipe exceeds a certain value, the performance of the base pipe is easy to change greatly, and the performance of the composite pipe is reduced.
The composite pipe is prepared by adopting the preparation process in any one of the technical schemes, and the clamping force strength of the composite pipe is greater than 0.8 MPa.
In summary, the embodiment of the present application has the following beneficial effects:
1) according to the embodiment of the application, the gaps between the liner tube and the base tube in the composite tube of the low-plasticity liner tube are eliminated through two cold deformation treatments aiming at the diameter expansion of the liner tube and the diameter reduction of the base tube, so that the combination state of the liner tube and the base tube is excellent, and the clamping strength of the composite tube finished product meets the use requirement.
2) Furthermore, the embodiment of the application expands the diameter by acting on the inner diameter of the liner tube by adopting a hydraulic composite method, and reduces the diameter by acting on the outer diameter of the base tube by adopting a cold drawing method, so that gaps between the liner tube and the base tube in the composite tube of the low-plasticity liner tube are eliminated, the combination state of the composite tube is excellent, and the clamping strength of the finished composite tube meets the use requirement.
3) The preparation process is particularly suitable for preparing the composite pipe with the dual-phase steel as the liner pipe and the carbon steel as the base pipe, and the clamping strength of the dual-phase steel composite pipe prepared in the corresponding embodiment is detected according to a method for testing the clamping force of GB/T31940-.
Drawings
FIG. 1 is a schematic view showing the operation flow in the hydraulic compounding step;
FIG. 2 is a schematic cross-sectional structure of a cold drawing process;
FIG. 3 is a schematic view showing the operation in the cold drawing step;
in the figure, 1-hydraulic mould, 2-cold drawing mould, 3-base pipe, 4-liner pipe, 5-high pressure water body and 6-lubricating layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. The embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive step, are within the scope of the present invention.
The present invention will be described in detail below by way of examples with reference to the accompanying drawings.
Example 1, the liner tube of the composite tube adopts a 00Cr23Ni4N dual-phase steel tube, the base tube adopts 20# or L245 steel grade, and the preparation process of the composite tube comprises the following steps:
firstly, mechanical expanding is carried out, a mold combination is adopted, the inner wall of a liner tube 4 rotates and advances, so that the liner tube 4 is simultaneously or locally expanded and is attached to the inner surface of a base tube 3, pressure is further increased or a rotary mold with larger size is followed, so that the liner tube 4 and the base tube 3 are simultaneously further deformed, and after the rotary head mold is processed, the base tube 3 rebounds to generate a composite effect;
then, acting on the outer surface of the base pipe 3 in a cold rolling or combined cold rolling extrusion mode to enable the base pipe to generate plastic deformation to a certain degree and reduce the diameter to obtain a composite pipe;
and (4) detecting and demagnetizing the composite pipe to obtain the finished composite pipe.
The clamping strength of the composite tube is detected to reach more than 0.8MPa by adopting a GB/T31940-.
Example 2 referring to fig. 1 and 2, a liner tube of a composite pipe adopts a steel tube of 00Cr22Ni5Mo3N bidirectional steel, and a base tube adopts a steel tube of No. 20 steel, and the preparation process of the composite pipe comprises the following steps of nesting ①, namely embedding the bidirectional steel liner tube 4 into the No. 20 steel base tube 3;
② hydraulic compounding, namely filling a high-pressure water body 5 into the liner tube 4 by adopting a hydraulic process in the hydraulic mould 1, and performing primary laminating operation on the outer wall of the liner tube 4 and the inner wall of the base tube 3 to prepare a primary composite tube, wherein the deformation of the liner tube is less than or equal to 5%, and the outer diameter is increased by about 4 mm;
③ primary cutting and welding, cutting the pipe end and the deformed part of the pipe end due to water pressure of the primary composite pipe by 10cm respectively, and welding the cut end with welding wire special for dual-phase steel;
④ cold drawing, namely, cold drawing the primary composite pipe obtained in the step ③ by a cold drawing die 2, smearing a lubricating layer 6 formed by suspension lubricant on the outer wall of the base pipe 3 in the drawing process, wherein the deformation of the base pipe 3 is less than or equal to 1.5 percent, the outer diameter is reduced by about 1mm, and straightening is carried out after cold drawing to obtain a secondary composite pipe;
⑤ performing secondary cutting and welding, namely, respectively welding the pipe end and the pipe tail of the secondary composite pipe by 5cm after the pipe end and the pipe tail are deformed by drawing, and performing surfacing welding on the cut end part;
⑥, rounding and fine boring, namely rounding and fine boring the secondary composite pipe obtained in the step ⑤ to obtain a composite pipe;
⑦, performing whole pipe nondestructive testing, demagnetization and finished product inspection on the composite pipe obtained in the step ⑥ to obtain a finished product composite pipe.
The clamping strength of the composite tube is detected to reach 1.0MPa by adopting a GB/T31940-.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The preparation process of the pipe with the low-strength base pipe and the composite elastic liner pipe is characterized by comprising the following steps of:
firstly, a cold deformation process is adopted to act on the inner wall of a liner tube, so that the diameter of the liner tube is expanded, and the liner tube is attached to the inner wall of a base tube;
and then acting on the outer wall of the base pipe by adopting a cold deformation process to reduce the diameter of the base pipe to obtain the composite pipe.
2. The process for preparing a low strength basepipe composite elastic liner pipe according to claim 1, comprising the steps of:
① nesting, namely nesting the liner inside the base pipe;
② water pressure compounding, namely performing primary attaching operation on the outer wall of the liner tube and the inner wall of the base tube through water pressure to prepare a primary compound tube;
③ primary cutting and welding, namely, partially cutting off the end part of the primary composite pipe and welding the cut end part;
④, cold drawing, namely, cold drawing the primary composite pipe obtained in the step ③ to obtain a secondary composite pipe;
⑤ secondary cutting and welding, wherein the end of the secondary composite pipe is partially cut off and the cut end is welded;
⑥, rounding and fine boring, namely rounding and fine boring the secondary composite pipe obtained in the step ⑤ to obtain the composite pipe.
3. The process for preparing the tubular product of the composite elastic liner tube with the low-strength base tube as claimed in claim 2, wherein in the step ④, the primary composite tubular product is straightened after being subjected to cold drawing treatment to obtain the secondary composite tubular product.
4. The process for preparing the low-strength base pipe composite elastic liner pipe according to claim 2, wherein in the step ⑤, the cut end part is subjected to surfacing treatment.
5. The process for preparing a tubular product with a low-strength base pipe and a composite elastic liner pipe according to claim 2, wherein the process further comprises a step ⑦ of detecting and demagnetizing the composite tubular product obtained in the step ⑥ after the step ⑥ to obtain a finished composite tubular product.
6. The process for preparing a low strength basepipe composite elastic liner pipe according to claim 2, wherein: the liner is made of a material having a plastic elongation of less than 25%.
7. The process for preparing a low strength basepipe composite elastic liner pipe according to claim 2 or 6, wherein the process comprises the following steps: the base pipe is made of a material with yield strength less than 450 MPa.
8. The process of claim 6, wherein in step ②, the liner tube has a deformation of no more than 5.0% and a diameter reduction of no more than 6.0 mm.
9. The process of claim 7, wherein in step ④, the deformation of the basepipe is no more than 2.5% and the reduction is no more than 4mm during the cold drawing process.
10. Compound tubular product, its characterized in that: the material is prepared by the preparation process of any one of claims 1-9, and the clamping strength of the material is greater than 0.8 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010289032.3A CN111421044A (en) | 2020-04-14 | 2020-04-14 | Preparation process of low-strength base pipe composite elastic liner pipe and composite pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010289032.3A CN111421044A (en) | 2020-04-14 | 2020-04-14 | Preparation process of low-strength base pipe composite elastic liner pipe and composite pipe |
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| CN111421044A true CN111421044A (en) | 2020-07-17 |
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| CN202010289032.3A Pending CN111421044A (en) | 2020-04-14 | 2020-04-14 | Preparation process of low-strength base pipe composite elastic liner pipe and composite pipe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113414364A (en) * | 2021-06-21 | 2021-09-21 | 山西昌达盛精密铸造有限公司 | Solid-state double-metal inner wall wear-resistant material conveying circular pipe and preparation method thereof |
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| CN105135070A (en) * | 2015-08-17 | 2015-12-09 | 葫芦岛金属复合材料有限公司 | Method for manufacturing explosion-expansion internal-wrapping composite pipe |
| CN107143703A (en) * | 2017-05-27 | 2017-09-08 | 中国石油天然气集团公司 | The mechanical composite tube and its manufacture method of a kind of nickel-base alloy of liner 825 |
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2020
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2767797Y (en) * | 2004-11-25 | 2006-03-29 | 娄树清 | Double layer metal composite pipe |
| JP2008240128A (en) * | 2007-03-29 | 2008-10-09 | Kobelco & Materials Copper Tube Inc | Copper alloy tube |
| CN101670383A (en) * | 2009-07-20 | 2010-03-17 | 大连合生科技开发有限公司 | Method for manufacturing inner covered stainless steel compound steel pipe |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113414364A (en) * | 2021-06-21 | 2021-09-21 | 山西昌达盛精密铸造有限公司 | Solid-state double-metal inner wall wear-resistant material conveying circular pipe and preparation method thereof |
| CN113414364B (en) * | 2021-06-21 | 2023-03-21 | 山西昌达盛精密铸造有限公司 | Solid-state double-metal inner wall wear-resistant material conveying circular pipe and preparation method thereof |
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Application publication date: 20200717 |