Pipe with vertical pre-deformation structure and production method thereof

Abstract

The invention relates to a pipe with a vertical pre-deformation structure and a production method of the pipe. The pipe comprises an outer pipe; an inner tube; the reinforcing ribs are connected with the outer pipe and the inner pipe, the inner pipe located between every two adjacent reinforcing ribs is punched to be in an arc shape, and the top of the arc shape is tightly attached to the outer pipe. Compared with the prior art, the pressure bearing degree of the pipe is increased, the thickness of the pipe is reduced, and pipe materials are saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipe materials, and particularly relates to a pipe with a vertical pre-deformation structure and a production method thereof. Background Art

[0002] In the modern construction industry, aluminum alloy is a very common material and can be made into various items for use. Among them, aluminum alloy pipes are used the most, which can replace other pipes for use and improve the use efficiency. The main reason for using aluminum alloy pipes during use is that they have good performance and can improve the use effect during use.

[0003] There are mainly several characteristics of aluminum alloy pipes.

[0004] First, it has extremely high strength and can prevent damage when collided with other objects during use. Aluminum alloy pipes have extremely high strength. Compared with ordinary steel pipes, they are not easily damaged, which can improve the use efficiency and extend the service life.

[0005] Second, during the production process, it has undergone various chemical material tests and can reduce the occurrence of corrosion by chemical elements during use. It can resist the corrosion of various chemical elements during use and increase the use time during use.

[0006] Third, during use, due to its extremely high strength, it will not deform during use. It can be used anywhere and improve the adaptability to the use environment.

[0007] However, for conventional thick-walled solid pipes, when there is internal hydraulic pressure, the tensile force on the pipe wall is distributed in a gradient and the performance potential of the material cannot be fully exerted. And in order to increase the pressure-bearing degree, the pipe thickness is often increased.

[0008] CN107289204A discloses an array-type pre-deformed double-layer mechanical pipe and its outer pipe and lining pipe. The outer wall of the lining pipe is closely attached to the inner wall of the outer pipe, and there are multiple non-fitting plastic deformations between the outer wall of the lining pipe and the inner wall of the outer pipe. The plastic deformations are arranged on the surface of the lining pipe and are recessed downward towards the center of the lining pipe. The position of the plastic deformation is the critical defect position of the lining pipe, and the critical defect is an artificially defect arranged periodically. However, this application only enhances the thickness of the outer pipe, and the deformed part of the lining pipe is far from the outer pipe and is not completely attached to the outer pipe. The formed pre-deformation structure only solves the problem that the lining thickness of the double-layer pipe does not need to be increased. Summary of the Invention

[0009] The object of the present invention is to overcome the defects of the above-mentioned prior art and provide a pipe with a vertical pre-deformation structure and its production method.

[0010] The object of the present invention can be achieved by the following technical solutions:

[0011] The first aspect of the present invention provides a pipe with a vertical pre-deformation structure, including:

[0012] An outer pipe;

[0013] An inner pipe; and

[0014] A number of reinforcing ribs connecting the outer pipe and the inner pipe, and the inner pipe between two adjacent reinforcing ribs is pressed into an arc shape, and the top of the arc shape is in close contact with the outer pipe.

[0015] Further, the reinforcing ribs are evenly arranged between the outer pipe and the inner pipe.

[0016] Further, the reinforcing rib is rectangular, one end of which abuts against the outer pipe, the other end of which abuts against the inner pipe, the reinforcing rib is perpendicular to the outer pipe and the inner pipe, and its extension line passes through the center of the inner pipe.

[0017] Further, the material of the reinforcing rib is a metal material.

[0018] Further, the materials of the outer pipe and the inner pipe are both metal materials.

[0019] Further, the tensile strength of the outer pipe is greater than that of the inner pipe, the tensile strength of the reinforcing rib is greater than that of the inner pipe, and the toughness of the inner pipe is greater than that of the outer pipe.

[0020] Further, the ratio of the thickness of the reinforcing rib to the inner diameter of the outer pipe is 40:1 - 60:1.

[0021] Furthermore, the material of the outer pipe is selected from one or more of 7075T6 aluminum alloy, 7A04 T6 aluminum alloy or other high-strength aluminum alloys.

[0022] Furthermore, the material of the inner pipe is selected from one or more of 7475 aluminum alloy, 7050 aluminum alloy or 7175 aluminum alloy.

[0023] Preferably, the material of the outer pipe is 7075T6 aluminum alloy.

[0024] Preferably, the material of the inner pipe is 7475 aluminum alloy.

[0025] Preferably, the material of the reinforcing rib is 7075T6 aluminum alloy.

[0026] Preferably, the ratio of the thickness of the reinforcing rib to the inner diameter of the outer tube is 50:1.

[0027] The second aspect of the present invention provides a production method of a pipe with a vertical pre-deformation structure, including the following steps:

[0028] S1: Prepare a prefabricated rigid tooling that matches the outer tube according to the shape and size of the outer tube;

[0029] S2: Assemble the inner tube, the outer tube, and the reinforcing rib and place the outer tube in the prefabricated rigid tooling, where the outer tube is in close contact with the prefabricated rigid tooling;

[0030] S3: Perform a uniform primary hydraulic pressure along the circumferential direction of the inner tube. The pressure of the primary hydraulic pressure is 50 - 80 MPa, and the time of the primary hydraulic pressure is 20 - 40 min;

[0031] S4: Then perform a uniform secondary hydraulic pressure along the circumferential direction of the inner tube. The pressure of the secondary hydraulic pressure increases by 20% - 40%. The time of the secondary hydraulic pressure is 25 - 45 min. Continuously increase the number of hydraulic pressure times consistent with the pressure of the secondary hydraulic pressure until the inner tube between two adjacent reinforcing ribs is in an arc shape and the top of the arc shape is in close contact with the outer tube, and the interval between two adjacent secondary hydraulic pressures is 0.5 - 3 min.

[0032] Preferably, the time of the primary hydraulic pressure is 30 min.

[0033] Preferably, the pressure of the primary hydraulic pressure is 70 MPa.

[0034] Preferably, the pressure of the secondary hydraulic pressure increases by 40%.

[0035] Preferably, the time of the secondary hydraulic pressure is 30 min.

[0036] Preferably, the interval between two adjacent numbers of secondary hydraulic pressure times is 1 min.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] (1) The inner tube of this pipe is attached to the outer tube through the reinforcing rib, thereby improving the overall hydraulic stamping resistance of the pipe, having good airtightness, and expanding the application range of the pipe.

[0039] (2) This pipe can increase the overall hydraulic stamping resistance of the pipe without increasing the thickness, reduce the material usage of the pipe, and save costs. Description of the Drawings

[0040] Figure 1 It is a schematic cross-sectional view of this pipe in Example 1.

[0041] Figure 2Schematic cross-sectional view of the pipe without pre-deformation in Example 1.

[0042] Figure 3 Schematic flow chart of the production process of the pipe in Example 2.

[0043] 1 - Outer pipe, 2 - Inner pipe, 3 - Reinforcing rib. Detailed implementation mode

[0044] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and gives a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0045] In the technical solution of the present invention, components such as component models, material names, connection structures, control methods, etc. that are not clearly described are regarded as common technical features disclosed in the prior art.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0047] In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined. In addition, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a bolt connection or a welding connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] In order to increase the pressure-bearing capacity of the pipe, reduce the pipe thickness, and save pipe materials, the present invention provides a pipe with a vertical pre-deformation structure, and its structure can be seen in Figure 1 and Figure 2 as shown, including:

[0049] Outer pipe 1;

[0050] Inner pipe 2; and

[0051] A number of reinforcing ribs 3 connecting the outer pipe 1 and the inner pipe 2, and the inner pipe 2 between two adjacent reinforcing ribs 3 is pressed into an arc shape, and the top of the arc shape is in close contact with the outer pipe 1.

[0052] In some specific embodiments, please refer to again Figure 1 and Figure 2 As shown, the reinforcing ribs 3 are uniformly arranged between the outer tube 1 and the inner tube 2.

[0053] In some specific embodiments, please refer to again Figure 1 and Figure 2 As shown, the reinforcing rib 3 is rectangular, one end of which abuts against the outer tube 1 and the other end abuts against the inner tube 2. The reinforcing rib 3 is perpendicular to the outer tube 1 and the inner tube 2 and its extension line passes through the center of the inner tube 2.

[0054] In some specific embodiments, please refer to again Figure 1 and Figure 2 As shown, the material of the reinforcing rib 3 is a metallic material.

[0055] In some specific embodiments, please refer to again Figure 1 and Figure 2 As shown, the materials of both the outer tube 1 and the inner tube 2 are metallic materials.

[0056] In some specific embodiments, please refer to again Figure 1 and Figure 2 As shown, the tensile strength of the outer tube 1 is greater than that of the inner tube 2, the tensile strength of the reinforcing rib 3 is greater than that of the inner tube 2, and the toughness of the inner tube 2 is greater than that of the outer tube 1.

[0057] In some specific embodiments, please refer to again Figure 1 and Figure 2 As shown, the ratio of the thickness of the reinforcing rib 3 to the inner diameter of the outer tube 1 is 40:1 - 60:1.

[0058] In more specific embodiments, please refer to again Figure 1 and Figure 2 As shown, the material of the outer tube 1 is selected from one or more of 7075T6 aluminum alloy, 7A04 T6 aluminum alloy or other high-strength aluminum alloys.

[0059] In more specific embodiments, please refer to again Figure 1 and Figure 2 As shown, the material of the inner tube 2 is selected from one or more of 7475 aluminum alloy, 7050 aluminum alloy or 7175 aluminum alloy.

[0060] The present invention also provides a production method for a pipe with a vertical pre-deformation structure. The steps are shown in Figure 3 and include the following steps:

[0061] S1: Prepare a prefabricated rigid tooling that matches the outer tube 1 according to the shape and size of the outer tube 1;

[0062] S2: Assemble the inner tube 2, the outer tube 1, and the reinforcing rib 3, and place the outer tube 1 in a prefabricated rigid tooling, where the outer tube 1 is in close contact with the prefabricated rigid tooling.

[0063] S3: Perform a uniform primary hydraulic pressure along the circumferential direction of the inner tube 2. The pressure of the primary hydraulic pressure is 50 - 80 MPa, and the time of the primary hydraulic pressure is 20 - 40 min.

[0064] S4: Then perform a uniform secondary hydraulic pressure along the circumferential direction of the inner tube 2. The pressure of the secondary hydraulic pressure increases by 20% - 40%. The time of the secondary hydraulic pressure is 25 - 45 min. Continuously increase the number of hydraulic pressure times consistent with the pressure of the secondary hydraulic pressure until the inner tube 2 between two adjacent reinforcing ribs 3 is in an arc shape and the top of the arc shape is in close contact with the outer tube 1, and the interval between two adjacent secondary hydraulic pressures is 0.5 - 3 min.

[0065] Each of the above embodiments can be implemented independently, or can be combined in any pair or more combinations.

[0066] The above embodiments will be described in more detail below with reference to specific embodiments.

[0067] Embodiment 1

[0068] See Figure 1 In order to increase the pressure-bearing degree of the pipe, reduce the pipe thickness, and save pipe materials, this embodiment provides a pipe with a vertical pre-deformation structure.

[0069] Figure 2 This is a schematic cross-sectional view of this pipe. This pipe includes an outer tube 1 and an inner tube 2 connected to the outer tube through a reinforcing rib 3.

[0070] Wherein, one end of the reinforcing rib 3 abuts against the outer tube 1, and the other end abuts against the inner tube 2. The material of the reinforcing rib 3 is 7075T6 aluminum alloy. The reinforcing rib 3 is in a regular rectangular shape, and the strength of the reinforcing rib 3 is greater than that of the inner tube 2 to ensure that no deformation occurs during the pre-deformation of the inner tube 2.

[0071] The inner tube 2 is attached to the outer tube 1 by stamping. The attachment part is the inner tube 2 between two adjacent reinforcing ribs 3. This part is in an arc shape and the top of its arc shape is attached to the outer tube 1.

[0072] Wherein, the material of the outer tube 1 is 7075T6 aluminum alloy, and the material of the inner tube is 7475 aluminum alloy.

[0073] In this embodiment, the inner diameter of the outer tube 1 is 300 mm, the thickness is 2 mm, and the thickness of the reinforcing rib 3 is 6 mm.

[0074] Comparative Example 1

[0075] This comparative example provides a pipe without vertical pre-deformation structure, see Figure 2 As described above, the inner diameter and thickness of the outer tube and the thickness of the reinforcing ribs in this comparative example are arranged in the same manner as those in Example 1.

[0076] Comparative Example 2

[0077] This comparative example provides a structure with only one layer of pipes, and the pipes have the same inner diameter and thickness as the outer pipe 1 in Example 1, and are made of 7075T6 aluminum alloy.

[0078] Comparative Example 3

[0079] This comparative example provides a structure with only one layer of pipes, and the pipes have the same thickness and length as the pipes in Example 1, and are made of 7475 aluminum alloy.

[0080] Pressure test:

[0081] See also Figure 1 , for pipes without vertical pre-deformation and see Figure 2 , static pressure test is performed on the vertical pre-deformed pipes together, wherein the static pressure test is as follows: firstly, the pipes in Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3 are filled with clean industrial water, the test water temperature is 15°C, and then the pipes are pressurized to 87.5MPa with a water pump. The air must be completely removed before pressurization, otherwise it will cause unstable pressure. The exhaust can be carried out through the valve installed at the highest point of the container. At the beginning of pressurization, the exhaust valve is opened one by one to exhaust the air outward until water is seen. Pressurization is carried out for 30 minutes

[0082] Test results:

[0083] The final result of Example 1 was that no water leakage was observed for 30 minutes;

[0084] The final result of comparative example 1 was 15min water leakage;

[0085] The final result of comparative example 2 was water leakage for 10 minutes;

[0086] The final result of Comparative Example 3 was water leakage for 8 minutes.

[0087] analyze:

[0088] It is found from the test that the pipe in Example 1 has good air tightness and strong hydraulic pressure resistance.

[0089] Example 2

[0090] See also Figure 3 As shown, this embodiment provides a method for producing a pipe with a vertical pre-deformation structure in Embodiment 1, comprising the following steps:

[0091] S1: Prepare a prefabricated rigid tooling that matches the shape and dimensions of the outer tube 1 according to the shape and dimensions of the outer tube 1.

[0092] S2: Assemble the inner tube 2, the outer tube 1, and the reinforcing rib 3 and place the outer tube 1 in the prefabricated rigid tooling, where the outer tube 1 is in close contact with the prefabricated rigid tooling.

[0093] S3: Perform a uniform primary hydraulic pressure along the circumferential direction of the inner tube 2. The pressure of the primary hydraulic pressure is 70 MPa, and the time of the primary hydraulic pressure is 30 min.

[0094] S4: Then perform a uniform secondary hydraulic pressure along the circumferential direction of the inner tube 2. The pressure of the secondary hydraulic pressure increases by 20% - 40%. The time of the secondary hydraulic pressure is 30 min. Continuously increase the number of hydraulic pressure times consistent with the pressure of the secondary hydraulic pressure until the inner tube 2 between two adjacent reinforcing ribs 3 is in an arc shape and the top of the arc shape is in close contact with the outer tube 1, and the interval between two adjacent secondary hydraulic pressures is 1 min.

[0095] The above description of the embodiments is to facilitate the understanding and use of the invention by those of ordinary skill in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A pipe with a vertical pre-deformation structure, characterized in that, Comprising: Outer tube (1); Inner tube (2); And A number of reinforcing ribs (3) connecting the outer tube (1) and the inner tube (2), and the inner tube (2) between two adjacent reinforcing ribs (3) is pressed into an arc shape and the top of the arc shape is in close contact with the outer tube (1).

2. The pipe with a vertical pre-deformation structure according to claim 1, characterized in that, The reinforcing ribs (3) are evenly arranged between the outer tube (1) and the inner tube (2).

3. The pipe with a vertical pre-deformation structure according to claim 1, characterized in that, The reinforcing rib (3) is rectangular and one end thereof abuts against the outer tube (1), the other end thereof abuts against the inner tube (2), the reinforcing rib (3) is perpendicular to the outer tube (1) and the inner tube (2) and its extension line passes through the center of the inner tube (2).

4. The pipe with a vertical pre-deformation structure according to claim 1, characterized in that, The material of the reinforcing rib (3) is a metallic material.

5. The pipe with a vertical pre-deformation structure according to claim 1, characterized in that, The materials of the outer tube (1) and the inner tube (2) are both metallic materials.

6. The pipe with a vertical pre-deformation structure according to claim 5, characterized in that, The material of the outer tube (1) is selected from one or more of 7075T6 aluminum alloy, 7A04 T6 aluminum alloy or other high-strength aluminum alloys.

7. The pipe with a vertical pre-deformation structure according to claim 5, characterized in that, The material of the inner tube (2) is selected from one or more of 7475 aluminum alloy, 7050 aluminum alloy or 7175 aluminum alloy.

8. The pipe with a vertical pre-deformation structure according to claim 1, characterized in that, The tensile strength of the outer tube (1) is greater than the tensile strength of the inner tube (2), the tensile strength of the reinforcing rib (3) is greater than the tensile strength of the inner tube (2), and the toughness of the inner tube (2) is greater than the toughness of the outer tube (1).

9. The pipe with a vertical pre-deformation structure according to claim 1, characterized in that, The ratio of the thickness of the reinforcing rib (3) to the inner diameter of the outer tube (1) is 40:1 - 60:

1.

10. A production method of the pipe with a vertical pre-deformation structure according to any one of claims 1-9, characterized in that, Including the following steps: S1: According to the shape and size of the outer tube (1), prepare a prefabricated rigid tooling matching the outer tube (1); S2: Assemble the inner tube (2), the outer tube (1) and the reinforcing ribs (3) and place the outer tube (1) in the prefabricated rigid tooling, wherein the outer tube (1) is in close contact with the prefabricated rigid tooling; S3: Perform a uniform primary hydraulic pressure along the circumferential direction of the inner tube (2), the pressure of the primary hydraulic pressure is 50 - 80 MPa, and the time of the primary hydraulic pressure is 20 - 40 min; S4: Then perform a uniform secondary hydraulic pressure along the circumferential direction of the inner tube (2), the pressure of the secondary hydraulic pressure increases by 20% - 40%, the time of the secondary hydraulic pressure is 25 - 45 min, and continuously increase the number of hydraulic pressure times consistent with the pressure of the secondary hydraulic pressure until the inner tube (2) between two adjacent reinforcing ribs (3) is in an arc shape and the top of the arc shape is in close contact with the outer tube (1), and the interval between two adjacent secondary hydraulic pressures is 0.5 - 3 min.

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