CN112090983A - Method for increasing adhesion of lining bimetal composite pipe - Google Patents
Method for increasing adhesion of lining bimetal composite pipe Download PDFInfo
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- CN112090983A CN112090983A CN202010922560.8A CN202010922560A CN112090983A CN 112090983 A CN112090983 A CN 112090983A CN 202010922560 A CN202010922560 A CN 202010922560A CN 112090983 A CN112090983 A CN 112090983A
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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
- 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
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/154—Making multi-wall tubes
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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
- 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
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/156—Making tubes with wall irregularities
- B21C37/158—Protrusions, e.g. dimples
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Abstract
The invention discloses a method for increasing the adhesive force of a lining bimetal composite pipe, which ensures that an inner pipe can be embedded into an outer pipe in the cold rolling composite process of the inner pipe and the outer pipe by drawing a groove structure on an inner hole of the outer pipe, thereby enhancing the composite force of the inner pipe and the outer pipe, improving the anti-torsion torque moment of the inner pipe and the outer pipe, and preventing the inner pipe and the outer pipe from rotating relatively in the subsequent machining process. The method effectively enhances the composite strength between the inner pipe and the outer pipe, thereby preventing the problem of relative rotation position of the inner pipe and the outer pipe in the subsequent machining process of the composite pipe, ensuring the inner hole machining quality of the inner pipe and further ensuring the quality of the produced hydraulic jack cylinder barrel.
Description
Technical Field
The invention belongs to the technical field of composite metal pipe production, and particularly relates to a method for increasing the adhesive force of a lining bimetal composite pipe.
Background
With the attention of people to environmental protection, safety and sanitation and the requirement of society on sustainable development, the inherent defects of mineral oil and high-water-base hydraulic fluid as working media are gradually revealed, so that the development of the traditional hydraulic transmission system faces a severe test, and people naturally think of water, namely the clean green working media. Since the 90 s in the 20 th century, environmental protection strategies of countries in the world present a new green strategy trend, which brings unprecedented development opportunities for hydraulic transmission technology.
The coal mine hydraulic support mainly comprises metal structural members such as a top beam and a base, hydraulic cylinders such as an upright post and a jack, and various hydraulic valves, wherein in order to adapt to the working property of emulsion and ensure the corrosion resistance of the hydraulic cylinders, the surfaces of components are required to be subjected to electroplating treatment, and a large amount of pollutants are generated in the electroplating treatment process, so that the surrounding environment is seriously polluted. And when each mining cycle is unloaded, the emulsion is discharged into a goaf, and the emulsion also seriously pollutes the water quality and the ecological environment of a water source around a mine.
The hydraulic transmission refers to hydraulic transmission which takes natural water, seawater, tap water of a treatment plant and the like without any additive as working media, the water is a clean green medium without pollution and low in cost, and the hydraulic transmission can ensure the production safety of a coal mine; the water has the advantages of safety, economy, stability, no harm to human bodies and the like. However, water lacks lubricity, has low viscosity, and easily corrodes metals. The stainless steel lined double-metal composite pipe not only solves the problem of the water medium of the hydraulic cylinder, but also solves the problem of electroplating pollution.
Lining a bimetal composite pipe: the outer pipe is also hardened and tempered by using a common hydraulic cylinder material 27SiMn (the yield strength is more than Q650) of a coal mine hydraulic support, the inner pipe is made of stainless steel (321, duplex stainless steel 22 Cr or 25 Cr, LC80-2507 and the like), an inner hole is directly scraped and rolled, and the inner hole of a finished cylinder barrel is not required to be plated with chrome; the support has the advantages of high strength, good toughness, impact resistance, corrosion resistance, simplified processing and the like. It will become the most ideal renewal product of the existing hydraulic support series.
If the lining bimetal composite pipe is used as a fluid pipe, the adhesion force of an inner pipe and an outer pipe does not have any problem, but when the lining bimetal composite pipe is used as a hydraulic cylinder, because the inner pipe needs to be honed or scraped and rolled after being compounded, in the machining process of the composite pipe, the outer pipe is usually clamped, and then a machining tool carries out machining on the inner pipe, and the following problems exist in the machining process at present:
because the inner tube and the outer tube are simply compounded, the direct bonding force of the inner tube and the outer tube is not enough, and in the machining process, because the inner tube of the composite tube needs to bear radial rotation machining moment, the inner tube and the outer tube are easy to rotate relatively, so that the inner tube and the outer tube cannot be machined normally, and the machining quality and the machining efficiency are seriously influenced.
Disclosure of Invention
The invention aims to provide a method and a method for increasing the adhesion force of a lining bimetal composite pipe, which solve the problem that the inner pipe and the outer pipe in the existing composite pipe generate relative rotation in the machining process of the pipe machine in the composite pipe due to insufficient bonding force, and the inner pipe is embedded in a composite mode, so that the composite pipe can bear the same machining torque as the outer pipe, relative rotation displacement cannot be generated due to cutting, the torque borne by the inner pipe and the outer pipe reaches 100N.m, and finally the normal machining process of the composite pipe is ensured, and the composite pipe can be stably used as a cylinder barrel of a hydraulic jack.
In order to achieve the technical features, the invention is realized as follows: a method of increasing the adhesion of a lined bimetallic composite pipe, comprising the steps of:
the method comprises the following steps: selecting blank pipes made of proper materials as an outer pipe and an inner pipe according to the use requirements of the hydraulic jack cylinder barrel to be produced so as to meet the requirement of subsequent composite use;
step two: performing primary quality detection on the outer pipe and the inner pipe;
step three: cold drawing and grooving the inner hole of the outer tube by using a grooving die, and further drawing a plurality of groove structures which are arranged along the axial direction of the inner hole of the outer tube;
step four: modulating the outer pipe;
step five: the prepared outer tube is processed by removing a clamping head, and then is sequentially subjected to acid cleaning, cleaning and neutralizing, phosphorizing and saponification surface treatment, wherein the treatment time of each process is 15-40 minutes;
step six: carrying out shot blasting treatment on the inner hole of the outer pipe, and generating uniformly distributed concave-convex structures on the inner surface of the outer pipe;
step seven: sleeving an inner pipe into an inner hole of an outer pipe;
step eight: performing composite cold rolling;
step nine: stress removal;
step ten: and (6) straightening treatment.
The overall requirement of the selection of the raw pipe in the step I is to ensure that the produced hydraulic jack cylinder barrel has high precision, high strength, weldability, corrosion resistance and wear resistance.
The blank pipe of the external pipe in the first step is 27SiMn or Q690;
the blank pipe of the inner pipe is made of stainless steel 321, duplex stainless steel 22 Cr or 25 Cr, LC 80-2507.
And in the second step, the surface quality of the outer tube and the inner tube blank tube for cold drawing is detected according to the requirements of GB/T8162, and the defects of pores, cracks, rolling and folding, scabbing and delamination are avoided.
In the fourth step, the specific modulation treatment process comprises the steps of quenching at 920 ℃ and tempering at 500-600 ℃ so that the hardness of the outer tube substrate is controlled at 230-260 HBW; the yield strength is more than 650 MPa.
And in the sixth step, after the outer pipe is subjected to shot blasting, the depth of the concave-convex structure on the inner surface of the outer pipe is 0.2-0.5 mm.
And the specific process in the step eight comprises the steps of carrying out composite cold rolling on the inner pipe and the outer pipe, and controlling the cold rolling quantity to be 0.3-1.0 mm.
After the straightening treatment in the step ten, the size indexes of the final cold-drawn composite steel pipe are obtained as follows:
dimensional accuracy: IT9-IT 14;
roundness of an inner hole: less than 0.2 mm;
straightness accuracy: 0.3-0.6 mm/m;
roughness of the inner and outer surfaces: r1.6-6.3;
hardness of the matrix: HB 240-280.
After the straightening treatment in the step ten, the mechanical property indexes of the final cold-drawn composite steel pipe are obtained as follows:
the tensile strength of the outer pipe is more than or equal to 800MPa, the yield strength is more than or equal to 650MPa, the elongation after fracture is more than or equal to 16%, the reduction of area is more than or equal to 45%, and the impact energy AKV2 (+ 20 ℃) is more than or equal to 39J;
the tensile strength of the inner tube is more than or equal to 862MPa, and the yield strength is more than or equal to 759 MPa.
In the third step, the cross section of the groove structure is rectangular, triangular or arc-shaped, and the groove depth of the groove structure is at least 0.3 mm.
The invention has the following beneficial effects:
1. by adopting the compounding method, the compounding strength between the inner pipe and the outer pipe is effectively enhanced, the problem that the inner pipe and the outer pipe rotate relatively in the subsequent machining process of the compound pipe is further prevented, the inner hole machining quality of the inner pipe is ensured, and the quality of the produced hydraulic jack cylinder barrel is further ensured.
2. The groove structure is pulled out of the inner hole of the outer pipe, so that the inner pipe can be embedded into the outer pipe in the cold rolling compounding process of the inner pipe and the outer pipe, the compounding force of the inner pipe and the outer pipe is enhanced, the anti-torsion torque of the inner pipe and the outer pipe is improved, and the inner pipe and the outer pipe are prevented from rotating relatively in the subsequent machining process.
3. Through carrying out shot blasting treatment in the hole of outer tube, make its inboard wall produce concave-convex structure, can further guarantee at the composite in-process, effective compound between outer tube and the inner tube has strengthened both compound forces, has improved both antitorque turning moments.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a cross-sectional view of the outer tube of the present invention after it has been grooved.
FIG. 2 is a cross-sectional view of the outer tube of the present invention after peening.
Fig. 3 is a main sectional view of the outer tube of the present invention.
Fig. 4 is a front sectional view of the inner tube of the present invention.
Fig. 5 is a cross-sectional view of the present invention after the inner tube and the outer sleeve have been applied.
Fig. 6 is a front view of the product after final compounding of the present invention.
Fig. 7 is a cross-sectional view of the present invention after the innerduct and the outer appearance have been composited.
In the figure: outer tube 1, groove structure 2, concave-convex structure 3, inner tube 4.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in fig. 1-7, a method of increasing the adhesion of a lined bimetallic composite pipe includes the following:
the method comprises the following steps: selecting blank pipes made of proper materials as the outer pipe 1 and the inner pipe 4 according to the use requirements of the hydraulic jack cylinder barrel to be produced so as to meet the follow-up composite use;
step two: performing primary quality detection on the outer pipe 1 and the inner pipe 4;
step three: carrying out cold drawing and groove drawing on the inner hole of the outer tube 1 by adopting a groove drawing die, and further drawing and drawing a plurality of groove structures 2 which are arranged along the axial direction of the inner hole of the outer tube 1;
step four: carrying out modulation treatment on the outer tube 1;
step five: the prepared outer tube 1 is processed by removing a clamping head, and then is sequentially processed by acid cleaning, cleaning and neutralizing, phosphorizing and saponifying surface treatment, wherein the processing time of each process is 15-40 minutes;
step six: carrying out shot blasting treatment on an inner hole of the outer tube 1, and generating uniformly distributed concave-convex structures 3 on the inner surface of the outer tube;
step seven: a sleeve process, namely sleeving the inner pipe 4 into the inner hole of the outer pipe 1;
step eight: performing composite cold rolling;
step nine: stress removal;
step ten: straightening treatment;
step eleven: delivering to a client, and honing, machining and assembling the inner hole of the inner pipe 4 of the cold-drawn composite pipe subsequently.
The overall requirement of the selection of the raw pipe in the step I is to ensure that the produced hydraulic jack cylinder barrel has high precision, high strength, weldability, corrosion resistance and wear resistance.
In the first step, the blank pipe of the outer pipe 1 is 27SiMn or Q690;
the blank pipe of the inner pipe 4 is made of stainless steel 321, duplex stainless steel 22 Cr or 25 Cr, LC 80-2507.
And in the second step, the surface quality of the blank pipes of the outer pipe 1 and the inner pipe 4 for cold drawing is detected according to the requirement of GB/T8162, and the defects of pores, cracks, rolling fracture, scabbing and delamination are avoided.
In the fourth step, the specific modulation treatment process comprises the steps of quenching at 920 ℃ and tempering at 500-600 ℃ so that the hardness of the matrix of the outer tube 1 is controlled at 230-260 HBW; the yield strength is more than 650 MPa.
In the sixth step, after the shot blasting is performed on the outer tube 1, the depth of the inner surface concave-convex structure 3 is 0.2 to 0.5 mm.
And the specific process in the step eight comprises the steps of carrying out composite cold rolling on the inner pipe 4 and the outer pipe 1, and controlling the cold rolling quantity to be 0.3-1.0 mm.
After the straightening treatment in the step ten, the size indexes of the final cold-drawn composite steel pipe are obtained as follows:
dimensional accuracy: IT9-IT 14;
roundness of an inner hole: less than 0.2 mm;
straightness accuracy: 0.3-0.6 mm/m;
roughness of the inner and outer surfaces: r1.6-6.3;
hardness of the matrix: HB 240-280.
After the straightening treatment in the step ten, the mechanical property indexes of the final cold-drawn composite steel pipe are obtained as follows:
the tensile strength of the outer pipe is more than or equal to 800MPa, the yield strength is more than or equal to 650MPa, the elongation after fracture is more than or equal to 16%, the reduction of area is more than or equal to 45%, and the impact energy AKV2 (+ 20 ℃) is more than or equal to 39J;
the tensile strength of the inner tube is more than or equal to 862MPa, and the yield strength is more than or equal to 759 MPa.
In the third step, the cross section of the groove structure 2 is rectangular, triangular or arc-shaped, and the groove depth of the groove structure 2 is at least 0.3 mm.
Example 2:
in this embodiment, the implementation steps of Φ 194 × Φ 160(15+2) are selected:
the method comprises the following steps: selecting blank pipes made of proper materials as the outer pipe 1 and the inner pipe 4 according to the use requirements of the hydraulic jack cylinder barrel to be produced so as to meet the follow-up composite use;
selecting the outer tube blank tube: 27SiMn or Q690 with specification phi of 203 multiplied by 16 multiplied by 6300 mm;
inner pipe blank pipe: 321 stainless steel, 22 Cr or 25 Cr duplex stainless steel, LC80-2507, specification phi 168 multiplied by 2 multiplied by 6000 mm;
step two: performing primary quality detection on the outer pipe 1 and the inner pipe 4; the surface quality of the outer tube and the inner tube blank tube for cold drawing is detected according to the requirement of GB/T8162, and the defects of air holes, cracks, rolling, scars, separation layers and the like are avoided;
step three: carrying out cold drawing and groove drawing on the inner hole of the outer tube 1 by adopting a groove drawing die, and further drawing and drawing a plurality of groove structures 2 which are arranged along the axial direction of the inner hole of the outer tube 1; further changing the outer tube to phi 203 multiplied by 16mm and the groove depth to 0.3 mm;
step four: carrying out modulation treatment on the outer tube 1; quenching at 920 ℃, tempering at 500 ℃, and controlling the hardness of the matrix at 230 HBW; the yield strength is more than 650 MPa;
step five: the prepared outer tube 1 is processed by removing a clamping head, and then is sequentially processed by acid cleaning, cleaning and neutralizing, phosphorizing and saponifying surface treatment, wherein the processing time of each process is 15-40 minutes;
step six: carrying out shot blasting treatment on an inner hole of the outer tube 1, and generating uniformly distributed concave-convex structures 3 on the inner surface of the outer tube; the depth of the concave-convex structure 3 is 0.2-0.5 mm;
step seven: sleeving a phi 168 multiplied by 2 inner tube 4 into an inner hole of a phi 203 multiplied by 16 outer tube 1;
step eight: performing composite cold rolling; carrying out composite cold rolling on phi 194 multiplied by phi 159 (15.5+2), and controlling the cold rolling quantity to be about 0.3-1.0 mm;
step nine: stress removal;
step ten: straightening treatment;
the indexes of the final cold-drawn steel pipe are as follows:
dimensional accuracy: IT9-IT 14;
roundness of an inner hole: less than 0.2 mm;
straightness accuracy: 0.3-0.6 mm/m;
roughness of the inner and outer surfaces: r1.6-6.3;
hardness of the matrix: HB 240-280;
the mechanical property indexes are as follows:
the tensile strength of the outer pipe is more than or equal to 800MPa, the yield strength is more than or equal to 650MPa, the elongation after fracture is more than or equal to 16%, the reduction of area is more than or equal to 45%, and the impact energy AKV2 (+ 20 ℃) is more than or equal to 39J;
the tensile strength of the inner tube is more than or equal to 862MPa, and the yield strength is more than or equal to 759 MPa;
step eleven: delivering to a client, and honing, machining and assembling the inner hole of the inner pipe 4 of the cold-drawn composite pipe subsequently.
Through the process, the inner hole of the produced composite pipe does not need to be electroplated.
Claims (10)
1. A method for increasing the adhesion of a lining bimetal composite pipe is characterized by comprising the following steps:
the method comprises the following steps: selecting blank pipes made of proper materials as an outer pipe (1) and an inner pipe (4) according to the use requirements of the hydraulic jack cylinder barrel to be produced so as to meet the requirement of subsequent composite use;
step two: performing primary quality detection on the outer pipe (1) and the inner pipe (4);
step three: carrying out cold drawing and groove drawing on the inner hole of the outer tube (1) by adopting a groove drawing die, and further drawing and drawing a plurality of groove structures (2) which are arranged along the axial direction of the inner hole of the outer tube (1);
step four: the outer tube (1) is subjected to modulation treatment;
step five: the outer tube (1) after modulation is processed by removing a clamping head, and then is sequentially processed by acid cleaning, cleaning and neutralizing, phosphorizing and saponifying surface treatment, wherein the processing time of each process is 15-40 minutes;
step six: carrying out shot blasting treatment on an inner hole of the outer pipe (1), and generating uniformly distributed concave-convex structures (3) on the inner surface of the outer pipe;
step seven: a sleeve process, namely sleeving the inner pipe (4) into an inner hole of the outer pipe (1);
step eight: performing composite cold rolling;
step nine: stress removal;
step ten: and (6) straightening treatment.
2. The method of increasing the adhesion of a lined bimetallic composite pipe as in claim 1, wherein: the overall requirement of the selection of the raw pipe in the step I is to ensure that the produced hydraulic jack cylinder barrel has high precision, high strength, weldability, corrosion resistance and wear resistance.
3. A method of increasing the adhesion of a lined bimetallic composite pipe according to claim 1 or 2, characterized in that: the blank pipe of the external pipe (1) in the first step is 27SiMn or Q690;
the blank pipe of the inner pipe (4) is made of stainless steel 321, duplex stainless steel 22 Cr or 25 Cr, LC 80-2507.
4. The method of increasing the adhesion of a lined bimetallic composite pipe as in claim 1, wherein: and in the second step, the surface quality of the blank pipes of the outer pipe (1) and the inner pipe (4) for cold drawing is detected according to the requirements of GB/T8162, and the defects of pores, cracks, rolling fracture, scabbing and delamination are avoided.
5. The method of increasing the adhesion of a lined bimetallic composite pipe as in claim 1, wherein: in the fourth step, the specific modulation treatment process comprises the steps of quenching at 920 ℃ and tempering at 500-600 ℃ so that the hardness of the matrix of the outer tube (1) is controlled at 230-260 HBW; the yield strength is more than 650 MPa.
6. The method of increasing the adhesion of a lined bimetallic composite pipe as in claim 1, wherein: in the sixth step, after the outer tube (1) is shot-blasted, the depth of the inner surface concave-convex structure (3) is 0.2-0.5 mm.
7. The method of increasing the adhesion of a lined bimetallic composite pipe as in claim 1, wherein: and the specific process in the step eight comprises the steps of carrying out composite cold rolling on the inner pipe (4) and the outer pipe (1), and controlling the cold rolling quantity to be 0.3-1.0 mm.
8. The method of increasing the adhesion of a lined bimetallic composite pipe as in claim 1, wherein: after the straightening treatment in the step ten, the size indexes of the final cold-drawn composite steel pipe are obtained as follows:
dimensional accuracy: IT9-IT 14;
roundness of an inner hole: less than 0.2 mm;
straightness accuracy: 0.3-0.6 mm/m;
roughness of the inner and outer surfaces: r1.6-6.3;
hardness of the matrix: HB 240-280.
9. The method of increasing the adhesion of a lined bimetallic composite pipe as in claim 1, wherein: after the straightening treatment in the step ten, the mechanical property indexes of the final cold-drawn composite steel pipe are obtained as follows:
the tensile strength of the outer pipe is more than or equal to 800MPa, the yield strength is more than or equal to 650MPa, the elongation after fracture is more than or equal to 16%, the reduction of area is more than or equal to 45%, and the impact energy AKV2 (+ 20 ℃) is more than or equal to 39J;
the tensile strength of the inner tube is more than or equal to 862MPa, and the yield strength is more than or equal to 759 MPa.
10. The method of increasing the adhesion of a lined bimetallic composite pipe as in claim 1, wherein: in the third step, the cross section of the groove structure (2) is rectangular, triangular or arc-shaped, and the groove depth of the groove structure (2) is at least 0.3 mm.
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| CN202010922560.8A CN112090983A (en) | 2020-09-04 | 2020-09-04 | Method for increasing adhesion of lining bimetal composite pipe |
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| CN202010922560.8A CN112090983A (en) | 2020-09-04 | 2020-09-04 | Method for increasing adhesion of lining bimetal composite pipe |
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| CN1320493A (en) * | 2001-05-18 | 2001-11-07 | 祁国臣 | Manufacturing method of high-bonding-force bimetal composite pipe |
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| CN204397638U (en) * | 2015-01-05 | 2015-06-17 | 西安科技大学 | A kind of contour peening device of composite bimetal pipe |
| CN108973105A (en) * | 2018-08-16 | 2018-12-11 | 宜昌中南精密钢管有限公司 | A kind of forming frock and method of inner liner stainless steel multiple tube |
| CN208427786U (en) * | 2018-05-16 | 2019-01-25 | 王志坚 | Axis hole kerve tooling |
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2020
- 2020-09-04 CN CN202010922560.8A patent/CN112090983A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320493A (en) * | 2001-05-18 | 2001-11-07 | 祁国臣 | Manufacturing method of high-bonding-force bimetal composite pipe |
| CN102278541A (en) * | 2011-07-15 | 2011-12-14 | 宜昌中南精密钢管有限公司 | Bimetallic composite pipe and preparation method |
| CN202510850U (en) * | 2012-02-29 | 2012-10-31 | 江苏银环精密钢管股份有限公司 | Bimetallic clad pipe |
| CN103465173A (en) * | 2013-09-29 | 2013-12-25 | 东莞市丹佛斯节能科技有限公司 | Shot blasting process of heat dissipation inner container and shot blasting device thereof |
| CN204397638U (en) * | 2015-01-05 | 2015-06-17 | 西安科技大学 | A kind of contour peening device of composite bimetal pipe |
| CN208427786U (en) * | 2018-05-16 | 2019-01-25 | 王志坚 | Axis hole kerve tooling |
| CN108973105A (en) * | 2018-08-16 | 2018-12-11 | 宜昌中南精密钢管有限公司 | A kind of forming frock and method of inner liner stainless steel multiple tube |
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