A method for preparing a composite pipe, the composite pipe itself, and an apparatus for processing the composite pipe.

Abstract

This invention provides a method for preparing a composite pipe, a composite pipe, and a processing apparatus for a composite pipe, relating to the field of composite pipe technology. It addresses the problem that existing bimetallic composite pipes only possess compressive strength and cannot simultaneously achieve vibration reduction and sound absorption performance, resulting in a limited range of applications. The method for preparing the composite pipe includes: providing a metal pipe, a hollow sphere, and a metal substrate; the melting point of both the metal pipe and the hollow sphere is greater than the melting point of the metal substrate; melting the metal substrate to obtain a liquid metal substrate; centrifugally casting the liquid metal substrate and the hollow sphere into a rotating metal pipe, so that the liquid metal substrate and the hollow sphere are located on the inner wall of the metal pipe to obtain a composite structure with a hollow sphere; and cooling the composite structure with the hollow sphere to solidify the liquid metal substrate and obtain a composite pipe with a hollow sphere.

Description

Technical Field

[0001] This invention relates to the field of composite pipe technology, and in particular to a method for preparing a composite pipe, a composite pipe, and a processing apparatus for a composite pipe. Background Technology

[0002] Bimetallic composite pipe is a type of pipe made by combining two different metal materials through a special process. It is widely used in oil fields, chemical plants, power plants, and other industrial sectors. With the continuous development of modern industry, especially in high-end equipment and extreme working conditions, higher performance requirements are being placed on bimetallic composite pipes.

[0003] Currently, bimetallic composite pipes only possess compressive strength, but existing bimetallic composite pipes cannot simultaneously achieve vibration reduction and sound absorption performance, resulting in a limited range of applications for bimetallic composite pipes. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing a composite pipe, a composite pipe, and a processing device for a composite pipe, which can take into account both vibration reduction and sound absorption and compressive strength, thereby expanding the application range of composite pipes.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a method for preparing a composite tube. The method for preparing the composite tube includes:

[0007] Metal tubes, hollow spheres, and metal substrates are provided; the melting points of the metal tubes and hollow spheres are both greater than the melting point of the metal substrates.

[0008] Melt the metal substrate to obtain a liquid metal substrate;

[0009] Centrifugal casting is used to inject liquid metal substrate and hollow sphere into a rotating metal tube, so that the liquid metal substrate and hollow sphere are located on the inner wall of the metal tube and a composite structure with hollow sphere is obtained.

[0010] The composite structure with hollow spheres is cooled to solidify the liquid metal substrate and obtain a composite tube with hollow spheres.

[0011] In the method for preparing the composite tube provided by this invention, since the melting points of both the metal tube and the hollow sphere are greater than those of the metal substrate, neither the hollow sphere nor the metal tube will melt when the liquid metal substrate and the hollow sphere are injected into the rotating metal tube, thus ensuring the original shape of the hollow sphere and the metal tube. Furthermore, the composite structure with the hollow sphere is subjected to a cooling treatment to solidify the liquid metal substrate and obtain the composite tube with the hollow sphere. Compared to the prior art method of directly mechanically joining two metal tubes together to form a composite tube, the composite tube produced by the method provided by this invention has a higher interface bonding strength, reduces or eliminates the probability of delamination failure, and extends the service life of the composite tube. Furthermore, since the composite tube includes a metal tube and a solidified metal substrate, and since all solid metals have compressive strength, the composite tube also possesses compressive strength. Because the composite tube includes a hollow sphere, which can dissipate energy due to its unique cavity structure, the composite tube exhibits excellent sound absorption and energy absorption properties. In summary, the composite pipe manufactured using the method provided by this invention combines vibration reduction and sound absorption with compressive strength, thus expanding the application range of the composite pipe.

[0012] In one implementation, the liquid metal substrate and the hollow sphere are metallurgically bonded to the metal tube; and / or, the metal tube is made of a different material than the metal substrate; and / or, the metal substrate is made of a lightweight metal.

[0013] In one implementation, the density of the hollow sphere is greater than the density of the liquid metal substrate; in the composite tube, the hollow sphere is located close to the inner wall of the metal tube.

[0014] In one implementation, the method for preparing the composite tube further includes, prior to centrifugal casting of the liquid metal substrate and the hollow sphere into a rotating metal tube:

[0015] The metal tube is fixed in a mold with a cavity and then heated to obtain a metal tube with a preset temperature.

[0016] Drive the mold and the metal tube with a preset temperature to rotate;

[0017] The preset temperature is greater than or equal to 0.6Tm and less than or equal to 0.8Tm; Tm represents the melting point temperature of the metal tube.

[0018] Secondly, the present invention also provides a composite tube, which is prepared using the composite tube preparation method described in the above technical solution. The composite tube comprises a metal tube and an inner liner tube. The inner liner tube is fitted inside the metal tube and comprises a metal substrate and a hollow sphere.

[0019] The composite tube provided by this invention comprises a metal tube and a metal substrate, and since all solid metals possess compressive strength, the composite tube also possesses compressive strength. Furthermore, because the composite tube includes a hollow sphere, the hollow sphere, with its unique cavity structure, can dissipate energy, thus the composite tube exhibits excellent sound absorption and energy absorption properties. In summary, the composite tube of this invention combines vibration reduction and sound absorption with compressive strength, expanding the application range of composite tubes.

[0020] Thirdly, the present invention also provides a processing apparatus for composite pipes, applied to the method for preparing some composite pipes described in the above-mentioned technical solutions. The processing apparatus for composite pipes includes: a mold, a base, a heating element, a clamping assembly, and a driving assembly. Along the axial direction of the mold, the mold has a cavity extending through it; the cavity is used to accommodate a metal pipe and / or a composite pipe. The base is used to support the mold; the clamping assembly is disposed on the mold and located within the cavity, and is used to clamp and fix the metal pipe located within the cavity; the driving assembly is used to drive the mold to rotate.

[0021] The composite pipe processing device provided by this invention has a simple structure and is easy to manufacture and use.

[0022] In one implementation, the processing device for the composite pipe further includes a heating element disposed on the mold.

[0023] In one implementation, the clamping component includes:

[0024] The first clamping unit is sleeved inside the mold, and the outer wall of the first clamping unit abuts against the inner wall of the mold; the first clamping unit is used to limit the axial movement of the metal tube and / or composite tube.

[0025] The second clamping unit is arranged opposite to the first clamping unit in a direction perpendicular to the mold axis; the end of the second clamping unit opposite to the first clamping unit moves toward or away from the first clamping unit to clamp and fix or release the metal tube located in the cavity.

[0026] Along the axial direction of the mold, the mold includes a first end and a second end opposite to each other; two clamping assemblies are located at the first end and the second end, respectively;

[0027] The second clamping unit included in the clamping assembly near the first end is detachably connected to the mold via a connecting assembly;

[0028] The second clamping unit, which is included in the clamping assembly near the second end, is securely connected to the inner wall of the mold.

[0029] In one implementation, the first clamping unit includes:

[0030] An annular connector is fitted inside the mold, with the outer wall of the annular connector abutting against the inner wall of the mold.

[0031] An annular limiting component is fitted inside an annular connecting component; the thickness of the annular limiting component is greater than the thickness of the annular connecting component, and the annular limiting component is used to limit the axial movement of the metal tube and / or composite tube; the thickness direction of the annular limiting component and the thickness direction of the annular connecting component are both perpendicular to the axial direction of the mold; the width of the annular connecting component is greater than the width of the annular limiting component, and the width direction of the annular connecting component and the width direction of the annular limiting component are both consistent with the axial direction of the mold.

[0032] The second clamping unit includes:

[0033] The driving component has a telescopic rod;

[0034] The clamping element is connected to the free end of the telescopic rod; the driving element is used to drive the clamping element to move closer to or away from the first clamping unit to clamp and fix or release the metal tube.

[0035] A groove is formed on the outer side wall of the first end of the mold; the connecting assembly includes:

[0036] The load-bearing component has a load-bearing surface;

[0037] The first connector is disposed on the bearing surface and engages with the groove.

[0038] The second connector is disposed on the bearing surface and is spaced apart from the first connector; the width of the second connector is greater than the width of the first connector; the width direction of the second connector and the width direction of the first connector are both perpendicular to the axial direction of the mold; the driving component is connected to the side of the second connector closest to the first connector.

[0039] In one implementation, the processing apparatus for the composite tube further includes a telescopic blocking assembly; the telescopic blocking assembly includes a receiving member and a telescopic blocking member. The receiving member has a receiving space and is connected to the side of the drive member opposite to the clamping member. Along the axial direction of the mold, the receiving member has an open end and a closed end. A first end of the telescopic blocking member is connected to the side of the clamping member, and a second end of the telescopic blocking member passes through the open end and is connected to the closed end. When the drive member drives the clamping member closer to or away from the first clamping unit, the telescopic blocking member extends or retracts. The telescopic blocking member, located outside the receiving member, is situated between the second clamping unit and the metal substrate. Attached Figure Description

[0040] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0041] Figure 1 This is a cross-sectional view of the composite pipe in an embodiment of the present invention;

[0042] Figure 2This is a side view of the composite tube in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the processing device for composite pipes in an embodiment of the present invention;

[0044] Figure 4 This is a cross-sectional view of a portion of the composite pipe processing device before assembly in an embodiment of the present invention.

[0045] Figure 5 As described in the embodiments of the present invention Figure 4 Enlarged schematic diagram of part of the structure;

[0046] Figure 6 This is a cross-sectional view of a portion of the structure of the composite pipe processing device in an embodiment of the present invention;

[0047] Figure 7 As described in the embodiments of the present invention Figure 6 Enlarged diagram of the middle section structure Figure 1 ;

[0048] Figure 8 As described in the embodiments of the present invention Figure 6 Enlarged diagram of the middle section structure Figure 2 ;

[0049] Figure 9 As described in the embodiments of the present invention Figure 8 Enlarged schematic diagram of the middle section structure;

[0050] Figure 10 This is a cross-sectional view of a portion of the structure of the composite pipe processing device in an embodiment of the present invention when a composite pipe is present.

[0051] Figure 11 As described in the embodiments of the present invention Figure 10 Enlarged diagram of the middle section structure Figure 1 ;

[0052] Figure 12 As described in the embodiments of the present invention Figure 10 Enlarged diagram of the middle section structure Figure 2 ;

[0053] Figure 13 This is a schematic diagram of the structure of the first clamping unit in an embodiment of the present invention;

[0054] Figure 14 This is a three-dimensional cross-sectional view of the connecting component in an embodiment of the present invention.

[0055] Figure label:

[0056] 1-Metal tube; 2-Inner liner tube; 20-Hollow sphere; 21-Metal substrate; 3-Mold; 30-Cavity; 31-Groove; 4-Base; 40-Bearing seat; 41-Bracket; 42-Rotating component; 5-Heating component; 6-Clamping assembly; 60-First clamping unit; 600-Annular connector; 601-Annular limiting component; 61-Second clamping unit; 610-Driver; 6100-Telescopic rod; 611-Clamping component; 7-Drive assembly; 8-Connecting assembly; 80-Bearing component; 81-First connector; 82-Second connector; 90-Telescopic blocking assembly; 900-Storage component; 901-Telescopic blocking component; 91-Casting ladle. Detailed Implementation

[0057] To facilitate a clear description of the technical solutions in the embodiments of the present invention, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. For example, the first threshold and the second threshold are merely used to distinguish different thresholds and do not limit their order. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that the terms "first" and "second" are not necessarily different.

[0058] It should be noted that in this invention, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0059] In this invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple.

[0060] To address the aforementioned technical problems, embodiments of the present invention provide a method for preparing a composite pipe, a composite pipe, and a processing apparatus for the composite pipe.

[0061] In a first aspect, the present invention provides a method for preparing a composite tube. The method for preparing the composite tube includes:

[0062] Step 101: See Figure 1 and Figure 2 The system provides a metal tube 1, a hollow sphere 20, and a metal substrate 21; the melting point of the metal tube 1 and the melting point of the hollow sphere 20 are both greater than the melting point of the metal substrate 21.

[0063] As one possible implementation, the material of the metal tube 1 is different from that of the metal substrate 21. In this case, the composite tube can possess the properties of different metal materials, further expanding the application range of the composite tube.

[0064] As one possible implementation, the metal tube 1 can be made of stainless steel, carbon steel, or titanium alloy. The material of the metal tube 1 is not specifically limited here, as long as it meets the actual requirements. When the metal tube 1 is made of stainless steel, the composite tube exhibits excellent compressive strength.

[0065] The aforementioned metal substrate 21 is made of a lightweight metal, which makes the composite pipe relatively light. For example, the metal substrate 21 can be made of aluminum, magnesium, or any material that meets the actual requirements. When the metal substrate 21 is made of aluminum, the composite pipe has corrosion resistance and salt and alkali resistance.

[0066] As one possible implementation, step 102: see Figure 1 and Figure 2 After providing the metal tube 1, the hollow sphere 20 and the metal substrate 21, the metal tube 1 and the hollow sphere 20 are surface treated to remove their surface oxides and contaminants.

[0067] For example, flap wheels and sandpaper are used to polish the inner surface of the metal tube 1 and the outer surface of the hollow sphere 20, respectively, to remove surface oxides and contaminants.

[0068] Step 103: Melt the metal substrate 21 to obtain a liquid metal substrate;

[0069] For example, a metal substrate 21 is placed in a melting furnace and heated to a target temperature, which is higher than the melting point of the metal substrate 21, so that the metal substrate 21 is completely melted, thereby obtaining a liquid metal substrate. Further, after obtaining the liquid metal substrate, it is kept at a certain temperature for a certain period of time to ensure that the liquid metal substrate has good fluidity and casting effect. For example, the difference between the target temperature and the melting point of the metal substrate 21 is greater than or equal to 50°C and less than or equal to 100°C. For example, the difference can be 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, or 100°C, etc.

[0070] Step 104: See Figure 1 and Figure 2 Centrifugal casting is used to inject liquid metal substrate and hollow sphere 20 into a rotating metal tube 1, so that the liquid metal substrate and hollow sphere 20 are located on the inner wall of the metal tube 1 and a composite structure with hollow sphere 20 is obtained.

[0071] For example, the drive motor is started, causing the metal tube 1 to rotate. Liquid metal substrate from the melting furnace is poured into the casting ladle 91 and mixed with the hollow spheres 20. Then, the liquid metal substrate and hollow spheres 20 are injected into the rotating metal tube 1 through the casting channel. During the rotation of the metal tube 1, the liquid metal substrate and hollow spheres 20 are evenly distributed on the inner wall of the metal tube 1 by centrifugal force. As one possible implementation, the liquid metal substrate and hollow spheres 20 form a metallurgical bond with the metal tube 1. Compared to the prior art method of directly mechanically joining two metal tubes 1 together to form a composite tube, this metallurgical bonding ensures superior performance of the composite tube, resulting in higher interfacial bonding strength, reducing or eliminating the probability of delamination failure, and extending the service life of the composite tube.

[0072] The material of the hollow sphere 20 is not specifically limited here, as long as it meets the actual requirements. For example, the hollow sphere 20 can be made of stainless steel, steel, etc.

[0073] As one possible implementation, the centrifugal force of the hollow sphere 20 is greater than that of the liquid metal substrate. In this case, the hollow sphere 20 is close to the inner wall of the metal tube 1, and there are no hollow spheres 20 distributed in the composite tube away from the metal tube 1. Based on this, the unevenness of the inner wall of the composite tube caused by the distribution of hollow spheres 20 can be avoided, thus ensuring the smoothness of the inner wall surface of the composite tube and guaranteeing the surface quality of the inner wall of the composite tube. Furthermore, the liquid metal substrate that solidifies later forms a complete layer, namely the inner wall layer of the composite tube.

[0074] In some embodiments, the density of the hollow sphere 20 is greater than the density of the liquid metal substrate.

[0075] Step 105: See Figure 1 and Figure 2 The composite structure with hollow spheres 20 is subjected to a cooling treatment to solidify the liquid metal substrate and obtain a composite tube with hollow spheres 20. The cooling method can be set according to the actual situation and is not specifically limited here.

[0076] As one possible implementation, after obtaining the composite tube with hollow sphere 20, the method for preparing the composite tube further includes:

[0077] After the temperature of the composite tube drops to the set temperature, the rotation of the composite tube is stopped, and then the composite tube is cut to obtain a complete composite tube.

[0078] For example, after the composite tube has completely cooled down, the drive motor is turned off to stop rotating, and then the clamping portions at both ends of the composite tube are cut off to obtain a complete composite tube.

[0079] As one possible implementation, the method for preparing the composite tube further includes, prior to centrifugal casting of the liquid metal substrate and the hollow sphere 20 into the rotating metal tube 1:

[0080] The metal tube 1 is fixed in the mold 3 with cavity 30, and the metal tube 1 is heated to obtain the metal tube 1 with a preset temperature.

[0081] Drive the mold 3 and the metal tube 1 with a preset temperature to rotate.

[0082] The preset temperature can be determined based on the melting point of the metal tube 1 or other influencing factors. In some embodiments, the preset temperature is greater than or equal to 0.6Tm and less than or equal to 0.8Tm; Tm represents the melting point temperature of the metal tube 1; for example, the preset temperature can be 0.6Tm, 0.63Tm, 0.65Tm, 0.7Tm, 0.73Tm, 0.75Tm, 0.78Tm, or 0.8Tm, etc.

[0083] If the temperature of the outer metal tube 1 in the composite tube is too low, the temperature of the liquid metal substrate will drop rapidly when it is injected into the metal tube 1, making diffusion of the liquid metal substrate difficult. Therefore, the metal tube 1 is heated before centrifugal casting. When the temperature of the metal tube 1 is at the preset temperature, the mutual diffusion efficiency between metals is higher, which facilitates the bonding of the liquid metal substrate with the solid metal tube.

[0084] It should be noted that there are various ways to heat the metal tube 1. For example, an induction heating coil can be installed inside the mold 3 to electromagnetically heat the metal tube 1. Alternatively, the mold 3 and the metal tube 1 can be placed in a heating chamber and heated simultaneously.

[0085] Since the metal tube 1 is fixed inside the mold 3 with cavity 30, when the mold 3 and the metal tube 1 with preset temperature are driven to rotate, the rotation speed of the mold 3 and the rotation speed of the metal tube 1 with preset temperature are equal. Under these circumstances, the liquid metal substrate and hollow sphere 20 are evenly distributed during centrifugal casting, so that the diameter of the composite tube obtained is basically the same or completely the same at all points, and the inner wall surface of the composite tube is flat, ensuring the quality of the inner wall surface of the composite tube.

[0086] See Figure 1 and Figure 2In the method for preparing the composite tube provided in this embodiment of the invention, since the melting point of the metal tube 1 and the hollow sphere 20 are both greater than the melting point of the metal substrate 21, neither the hollow sphere 20 nor the metal tube 1 will melt when the liquid metal substrate and the hollow sphere 20 are injected into the rotating metal tube 1, thus ensuring the original shape of the hollow sphere 20 and the metal tube 1. Furthermore, the composite structure with the hollow sphere 20 is subjected to a cooling treatment to solidify the liquid metal substrate and obtain the composite tube with the hollow sphere 20. Compared with the prior art method of directly mechanically joining two metal tubes 1 together to form a composite tube, the composite tube produced by the method provided in this embodiment of the invention has higher interfacial bonding strength, reduces or eliminates the probability of composite tube delamination failure, and extends the service life of the composite tube. Furthermore, since the composite tube includes the metal tube 1 and the solidified metal substrate 21, and since all solid metals have compressive strength, the composite tube has compressive strength. Especially when the metal pipe 1 is stainless steel or carbon steel, and the metal substrate 21 is made of a lightweight metal, the dissimilar solid metals possess advantages such as high strength, good toughness, light weight, corrosion resistance, and salt and alkali resistance. Therefore, the composite pipe manufactured using the method provided in this embodiment of the invention also possesses the aforementioned advantages. Since the composite pipe includes a hollow sphere 20, which dissipates energy due to its unique cavity 30 structure, the composite pipe exhibits excellent sound absorption and energy absorption properties. In summary, the composite pipe manufactured using the method provided in this embodiment of the invention not only combines vibration reduction and sound absorption with high strength and high toughness in its comprehensive mechanical properties, but also maintains excellent service performance in extreme environments such as high pressure, low temperature, high salt, and corrosion, expanding the application range of the composite pipe and enabling its engineering applications in a wide temperature range. In other words, the composite pipe manufactured using the method provided in this embodiment of the invention combines vibration reduction and sound absorption with excellent compressive and shear strength, corrosion resistance, and high stability. Based on this, it can meet the requirements for vibration attenuation under dynamic loads. Furthermore, the method provided in this embodiment of the invention achieves solid-liquid metallurgical bonding of different metal materials through centrifugal casting. Under the action of centrifugal force, the hollow spheres 20 are distributed near the inner wall of the metal tube 1, ensuring the surface quality of the inner wall of the composite tube and effectively solving the problem of poor performance and surface quality of the composite tube.

[0087] Secondly, embodiments of the present invention also provide a composite tube, which is prepared using the composite tube preparation method described in the above technical solution. See also Figure 1 and Figure 2 The aforementioned composite pipe includes a metal pipe 1 and an inner liner pipe 2. The inner liner pipe 2 is fitted inside the metal pipe 1, and the inner liner pipe 2 includes a metal substrate 21 and a hollow sphere 20. It should be noted that the metal substrate 21 here is the cooled liquid metal substrate mentioned in the first aspect.

[0088] See Figure 1 and Figure 2In the composite tube provided in this embodiment of the invention, since the composite tube includes a metal tube 1 and a metal substrate 21, and since all solid metals have compressive strength, the composite tube also possesses compressive strength. Furthermore, since the composite tube includes a hollow sphere 20, and the unique cavity 30 structure of the hollow sphere 20 can dissipate energy, the composite tube exhibits excellent sound absorption and energy absorption properties. In summary, the composite tube in this embodiment of the invention combines vibration reduction and sound absorption performance with compressive and shear strength, thus expanding the applicability of the composite tube.

[0089] As one possible implementation, see Figure 1 and Figure 2 Metal tube 1 and inner lining tube 2 are bonded together through interface metallurgy.

[0090] Compared to the existing technology of directly mechanically joining two metal tubes together to form a composite tube, the use of interfacial metallurgical bonding ensures that the composite tube has excellent performance, resulting in higher interfacial bonding strength, reducing or eliminating the probability of delamination failure, and extending the service life of the composite tube.

[0091] See Figure 1 and Figure 2 As one possible implementation, the hollow spheres 20 are located close to the inner wall of the metal tube 1, while no hollow spheres 20 are distributed in the composite tube at locations far from the metal tube 1. Based on this, the unevenness of the inner wall of the composite tube caused by the distribution of hollow spheres 20 can be avoided, thus ensuring a smooth inner wall surface and guaranteeing the quality of the inner wall surface of the composite tube.

[0092] As one possible implementation, the material of the metal tube 1 is different from that of the metal substrate 21. In this case, the composite tube can possess the properties of different metal materials, further expanding the application range of the composite tube.

[0093] As one possible implementation, the metal tube 1 can be made of stainless steel, carbon steel, or titanium alloy. The material of the metal tube 1 is not specifically limited here, as long as it meets the actual requirements. When the metal tube 1 is made of stainless steel, the composite tube exhibits excellent compressive strength.

[0094] The aforementioned metal substrate 21 is made of a lightweight metal, which makes the composite pipe relatively light. For example, the metal substrate 21 can be made of aluminum, magnesium, or any material that meets the actual requirements. When the metal substrate 21 is made of aluminum, the composite pipe has corrosion resistance and salt and alkali resistance.

[0095] As described above, when the metal tube 1 is made of stainless steel or carbon steel and the metal substrate 21 is made of a lightweight metal, the dissimilar solid metals possess advantages such as high strength, good toughness, light weight, corrosion resistance, and salt and alkali resistance. Furthermore, since the composite tube includes a hollow sphere 20, which dissipates energy due to its unique cavity 30 structure, the composite tube exhibits excellent sound absorption and energy absorption properties. In summary, the composite tube manufactured using the method provided in this embodiment of the invention combines vibration reduction and sound absorption, lightweight, high strength and toughness, corrosion resistance, and salt and alkali resistance, thus expanding the application range of the composite tube.

[0096] Thirdly, the present invention also provides a processing apparatus for composite pipes, which is applied to the method for preparing some of the composite pipes described in the first aspect. See also Figures 3 to 14 The processing device for the composite pipe includes: a mold 3, a base 4, a heating element 5, a clamping assembly 6, and a driving assembly 7. Along the axial direction A of the mold 3, the mold 3 has a cavity 30 extending through it; the cavity 30 is used to accommodate the metal pipe 1 and / or the composite pipe. The base 4 supports the mold 3; the clamping assembly 6 is disposed on the mold 3 and located within the cavity 30, and is used to clamp and fix the metal pipe 1 located within the cavity 30; the driving assembly 7 is used to drive the mold 3 to rotate. The composite pipe processing device provided in this embodiment of the invention has a simple structure and is easy to manufacture and use.

[0097] See Figures 3 to 14 Since the clamping assembly 6 is used to clamp and fix the metal tube 1 located in the cavity 30, when the driving assembly 7 drives the mold 3 to rotate and thus drives the metal tube 1 located in the mold 3 to rotate, the rotation speed of the mold 3 and the rotation speed of the metal tube 1 are equal. Under this condition, the liquid metal substrate and the hollow sphere 20 are evenly distributed during centrifugal casting, so that the diameter of the composite tube obtained is basically the same or completely the same at all points, making the inner wall surface of the composite tube flat and ensuring the quality of the inner wall surface of the composite tube.

[0098] As one possible implementation, see Figure 5 and Figure 7 The clamping assembly 6 includes: a first clamping unit 60 and a second clamping unit 61.

[0099] See Figure 5 , Figure 7 , Figure 8 , Figure 11 and Figure 12 The first clamping unit 60 is sleeved inside the mold 3. The first clamping unit 60 is located in the cavity 30. The outer wall of the first clamping unit 60 abuts against the inner wall of the mold 3. The first clamping unit 60 is used to limit the axial movement of the metal tube 1 and / or the composite tube.

[0100] See Figures 7 to 12Along direction B, perpendicular to the axial direction of mold 3, a first clamping unit 60 and a second clamping unit 61 are arranged opposite each other. One end of the second clamping unit 61 opposite to the first clamping unit 60 moves towards or away from the first clamping unit 60 to clamp and fix or release the metal tube 1 located within the cavity 30. In this case, the second clamping unit 61 can be used to limit the radial movement of the metal tube 1. Furthermore, the clamping assembly 6 can be applied to metal tubes 1 of different thicknesses, and thus to the manufacture of composite tubes of different thicknesses.

[0101] See Figures 6 to 8 Along the axial direction A of the mold 3, the mold 3 includes a first end and a second end opposite to each other; two clamping assemblies 6 are located at the first end and the second end respectively. Among them, the second clamping unit 61 included in the clamping assembly 6 near the first end is detachably connected to the mold 3 through the connecting assembly 8; the second clamping unit 61 included in the clamping assembly 6 near the second end is fastened to the inner wall of the mold 3.

[0102] See Figures 4 to 12 For example, when the first end of the mold 3 is the entry end of the metal tube 1, in actual use, the connecting assembly 8 is first removed from the mold 3. Since the second clamping unit 61 included in the clamping assembly 6 near the first end is detachably connected to the mold 3 through the connecting assembly 8, at the same time as the connecting assembly 8 is removed, the second clamping unit 61 included in the clamping assembly 6 near the first end is also moved out of the cavity 30 of the mold 3, leaving space for the metal tube 1 to enter the cavity 30 of the mold 3. Since the second clamping unit 61 included in the clamping assembly 6 near the second end is firmly connected to the inner wall of the mold 3, the first clamping unit 60 and the second clamping unit 61 included in the clamping assembly 6 near the second end are fixed in place in the cavity 30. Next, after the metal tube 1 enters the cavity 30 through the first end of the mold 3, the clamping assembly 6 near the second end clamps and fixes one end of the metal tube 1. Next, the assembled connecting component 8 and the clamping component 6 near the first end are installed on the mold 3, and the clamping component 6 near the first end clamps and fixes the other end of the metal tube 1.

[0103] See Figure 7 , Figure 8 and Figure 13In one optional embodiment, the first clamping unit 60 includes an annular connector 600 and an annular limiting member 601. The annular connector 600 is fitted inside the mold 3, with its outer wall abutting against the inner wall of the mold 3. The annular limiting member 601 is fitted inside the annular connector 600; the thickness D1 of the annular limiting member 601 is greater than the thickness D2 of the annular connector 600, and the annular limiting member 601 is used to limit the axial movement of the metal tube 1 and / or composite tube; the thickness direction of both the annular limiting member 601 and the annular connector 600 is perpendicular to the axial direction A of the mold 3. The width W1 of the annular connector 600 is greater than the width W2 of the annular limiting member 601, and the width direction of both the annular connector 600 and the annular limiting member 601 is aligned with the axial direction A of the mold 3.

[0104] See Figures 10 to 13 In actual use, the end of the metal tube 1 abuts against the annular limiting member 601, and part of the outer wall of the metal tube 1 abuts against the inner wall of the annular connector 600. It should be noted that the annular connector 600 and the annular limiting member 601 can be integrally formed or assembled separately. The material and dimensions of the annular connector 600 and the annular limiting member 601 can be set according to the actual situation. The shape of the annular connector 600 and the annular limiting member 601 is set according to the shape of the metal tube 1 and the shape of the inner wall of the mold 3. For example, the cross-sections of the annular connector 600, the annular limiting member 601, the metal tube 1, and the mold 3 are all circular. It should be noted that the aforementioned annulus is not limited to a circular annulus; it can also be a square annulus, a five-ring annulus, or other irregularly shaped annulus.

[0105] See Figures 7 to 13 When the above technical solution is adopted, since the thickness of the annular limiting member 601 is greater than the thickness of the annular connecting member 600, when the metal tube 1 is located between the two annular limiting members 601 distributed along the axial direction of the mold 3, the metal tube 1 is confined between the two annular limiting members 601, that is, the axial movement of the metal tube 1 is limited. Furthermore, since the annular connecting member 600 has a certain thickness and its width is greater than the width of the annular limiting member 601, the annular connecting member 600 separates the metal tube 1 from the inner wall of the mold 3. At this time, the outer wall of the metal tube 1 is exposed to the air in the cavity 30 of the mold 3. During the subsequent rotation of the metal tube 1, the air in the cavity 30 of the mold 3 is also rotating, and the air velocity is high. Especially when the liquid metal substrate needs to be cooled and solidified after casting, the rotating mold 3 has a high air velocity, which can accelerate the cooling efficiency of the liquid metal substrate, thereby improving the preparation efficiency of the composite tube.

[0106] See Figure 7 and Figure 8In one alternative embodiment, the second clamping unit 61 includes a drive member 610 and a clamping member 611. The drive member 610 has a telescopic rod 6100, the free end of which is connected to the clamping member 611. The drive member 610 drives the telescopic rod 6100 to move, causing the clamping member 611 to move closer to or further away from the first clamping unit 60, thereby clamping and fixing or releasing the metal tube 1.

[0107] For example, the clamping member 611 can be a clamping plate, and the material of the clamping plate can be set according to the actual situation. The driving member 610 can be a hydraulic driving member or a pneumatic driving member, and the driving source of the driving member 610 can be a hydraulic cylinder or a pneumatic cylinder. The telescopic rod 6100 can be a piston rod.

[0108] See Figure 4 , Figure 5 , Figure 7 and Figure 14 In one optional embodiment, a groove 31 is formed on the outer side wall of the first end of the mold 3. The connecting assembly 8 includes: a carrier 80, a first connector 81, and a second connector 82. The carrier 80 has a bearing surface; the first connector 81 is disposed on the bearing surface and is used to engage with the groove 31. The second connector 82 is disposed on the bearing surface, along the axial direction A of the mold 3, the second connector 82 is located on one side of the first connector 81, and the second connector 82 and the first connector 81 are spaced apart; the width W3 of the second connector 82 is greater than the width W4 of the first connector 81, this arrangement can reserve space for the later installation of the second clamping unit 61 and prevent the first connector 81 from interfering with the normal operation of the second clamping unit 61. The width direction of the second connector 82 and the width direction of the first connector 81 are both perpendicular to the axial direction A of the mold 3; the driving member 610 is connected to the side of the second connector 82 closest to the first connector 81. For example, the side of the drive member 610 is connected to the side of the second connector 82 that is close to the first connector 81 and faces the cavity 30.

[0109] It should be noted that the aforementioned support member 80, first connector 81, and second connector 82 can be integrally formed or assembled separately. The shape and size of the support member 80, first connector 81, and second connector 82 can be set according to actual conditions. For example, the support member 80 can be a ring-shaped support member or a semi-ring-shaped support member. The first connector 81 is a ring-shaped first connector or a semi-ring-shaped first connector. The second connector 82 is a ring-shaped second connector or a semi-ring-shaped second connector. It should be noted that the ring shape mentioned throughout can be circular, square, pentagonal, or other irregularly shaped. Furthermore, the thickness of the second connector 82 is greater than the thickness of the first connector 81, and the thickness direction of both the second connector 82 and the first connector 81 is consistent with the axial direction of the mold 3.

[0110] See Figures 7 to 12 As one possible implementation, the processing apparatus for the composite pipe further includes a telescopic blocking assembly 90. The telescopic blocking assembly 90 includes a receiving member 900 and a telescopic blocking member 901. The receiving member 900 has a receiving space and is connected to the side of the drive member 610 opposite to the clamping member 611. Along the axial direction A of the mold 3, the receiving member 900 has opposing open ends and closed ends. For example, as... Figure 9 As shown, the outer wall of the storage component 900 is fastened to the side of the drive component 610 that is away from the clamping component 611, and the open end of the storage component 900 faces the interior of the cavity 30 of the mold 3.

[0111] See Figures 7 to 12 The first end of the telescopic blocking member 901 is connected to the side of the clamping member 611, and the second end of the telescopic blocking member 901 passes through the open end and connects to the closed end. When the driving member 610 drives the clamping member 611 to move closer to or away from the first clamping unit 60, the telescopic blocking member 901 extends or retracts. The telescopic blocking member 901, located outside the receiving member 900, is situated between the second clamping unit 61 and the metal substrate 21. Specifically, the telescopic blocking member 901, located outside the receiving member 900, is situated between the second clamping unit 61 and the inner liner tube 2.

[0112] See Figure 11 and Figure 12 When the above technical solution is adopted, when liquid metal substrate and hollow sphere 20 are injected into the outer tube, the telescopic blocking component 90 is used to block the second clamping unit 61 from the liquid metal substrate and hollow sphere 20, so as to avoid the second clamping unit 61 being damaged by the flowing liquid metal substrate and hollow sphere 20. Specifically, the metal tube 1, the first clamping unit 60, the telescopic blocking component 90, and the inner wall of the mold 3 enclose the second clamping unit 61, preventing the second clamping unit 61 from coming into contact with the flowing liquid metal substrate and hollow sphere 20.

[0113] See Figure 7 and Figure 9For example, before the driving member 610 drives the clamping member 611 closer to the first clamping unit 60, the telescopic blocking member 901 is in a retracted state. When the driving member 610 drives the clamping member 611 closer to the first clamping unit 60, the telescopic blocking member 901 gradually extends to increase its overall size, thus protecting the second clamping unit 61. When the driving member 610 drives the clamping member 611 away from the first clamping unit 60, the telescopic blocking member 901 gradually retracts, returning to its original state. It should be noted that whether the telescopic blocking member 901 extends or retracts, the changed length of the telescopic blocking member 901 located on the side of the second clamping unit 61 is always equal to the changed height of the second clamping unit 61, and the height direction of the second clamping unit 61 is consistent with the extension and retraction direction of the telescopic rod 6100.

[0114] In some embodiments, when the telescopic blocking member 901 is an L-shaped baffle structure, the L-shaped baffle structure and the clamping member 611 move synchronously in telescopic motion. In the initial state, the L-shaped baffle structure consists of stacked baffles. As the stacked baffles gradually unfold, the total length of the L-shaped baffle structure gradually increases.

[0115] For example, when the telescopic rod 6100 moves the clamping member 611 closer to the first clamping unit 60, the height of the second clamping unit 61 increases. If the length of the fully extended baffle included by the telescopic blocking member 901 located outside the storage member 900 (i.e. the telescopic blocking member 901 originally located on one side of the second clamping unit 61) is equal to the height of the changed second clamping unit 61, then the telescopic blocking member 901 located inside the storage member 900 may not be extended or may be partially extended.

[0116] If the length of the fully extended baffle included in the telescopic blocking member 901 located outside the storage member 900 is less than the height of the modified second clamping unit 61, then the telescopic blocking member 901 located inside the storage member 900 is extended to compensate for the original telescopic blocking member 901 located on one side of the second clamping unit 61, so that the length of the extended telescopic blocking member 901 located on one side of the second clamping unit 61 is equal to the height of the modified second clamping unit 61.

[0117] When the telescopic rod 6100 moves the clamping member 611 away from the first clamping unit 60, the height of the second clamping unit 61 decreases, and the baffle included in the telescopic blocking member 901 returns to its original overlapping or folded state, so that the length of the telescopic blocking member 901 located on one side of the second clamping unit 61 is equal to the height of the changed second clamping unit 61.

[0118] In some embodiments, see Figure 9 The aforementioned telescopic blocking component 901 is an L-shaped telescopic blocking component. The material of the telescopic blocking component 901 can be flexible steel, carbon fiber fabric, etc.

[0119] As one possible implementation, see Figures 3 to 14 The composite tube processing apparatus further includes a heating element 5 disposed on the mold 3. In this case, the composite tube processing apparatus is applied to all the composite tube preparation methods described in the first aspect.

[0120] In one alternative embodiment, the heating element 5 can be disposed on the outer wall of the mold 3, on the inner wall of the mold 3, or between the outer and inner walls of the mold 3 (i.e., embedded in the solid portion of the mold 3). The location of the heating element 5 can be selected according to actual conditions and is not specifically limited here. See also Figure 5 and Figure 11 In this embodiment of the invention, the heating element 5 is disposed between the outer wall and the inner wall of the mold 3 and close to the cavity 30, which facilitates better heating of the metal tube 1 and improves heating efficiency.

[0121] In some embodiments, the heating element 5 may be an induction heating coil.

[0122] As one possible implementation, see Figure 3 The processing apparatus for the composite pipe also includes a casting ladle 91, which has a casting channel. The casting ladle 91 is used to melt the solid metal substrate 21 and to hold and contain the liquid metal substrate and the hollow sphere 20. In actual use, the liquid metal substrate and the hollow sphere 20 are injected into the rotating metal pipe 1 through the casting channel.

[0123] As one possible implementation, see Figure 3 The aforementioned base 4 includes: a support 40, brackets 41, and rotating members 42. Four brackets 41 are spaced apart on the support 40, and four rotating members 42 are correspondingly disposed on the four brackets 41, with each rotating member 42 rotating relative to the bracket 41. The specific connection method between the rotating members 42 and the brackets 41 is not specifically limited here. The mold 3 is rotatably disposed among the four rotating members 42. A drive assembly 7 is poweredly connected to one of the rotating members 42, driving the rotating member 42 to rotate, thereby causing the mold 3 to rotate. The other three rotating members 42 are driven members, rotating along with the mold 3. For example, the drive assembly 7 can be a drive motor, and the rotating members 42 can be rotating wheels.

[0124] The following describes the specific process of preparing composite tubes using a composite tube processing device, taking one possible implementation as an example. It should be understood that the following description is for comprehension only and is not intended to limit the specific implementation.

[0125] Step 101: See Figures 1 to 14 It provides a metal tube 1, a hollow sphere 20, and a metal substrate 21;

[0126] Among them, metal tube 1 is a seamless 304 stainless steel tube with an outer diameter of 200mm, a wall thickness of 5mm, and a length of 500mm. Hollow sphere 20 is a 304 stainless steel hollow sphere with an outer diameter of 4mm and a wall thickness of 0.5mm. There are 100 hollow spheres 20. 6061 aluminum alloy is selected as the metal substrate 21. Specifically, the metal substrate 21 has a volume of 2824... Aluminum ingots.

[0127] Step 102: See Figures 1 to 14 The metal tube 1 and the hollow sphere 20 are surface treated to remove oxides and contaminants from their surfaces.

[0128] For example, flap wheels and sandpaper are used to polish the inner surface of a 304 stainless steel seamless tube and the outer surface of a stainless steel hollow sphere, respectively, to remove surface oxides and contaminants.

[0129] Step 103: See Figures 1 to 14 The processed 304 stainless steel seamless tube is installed between two first clamping units 60, and then the second clamping unit 61 is activated to fix the 304 stainless steel seamless tube in the mold 3; the processed 304 stainless steel hollow sphere is placed in the casting ladle 91.

[0130] See Figures 1 to 14 Specifically, when the first end of the mold 3 is the entry end of the metal tube 1, in actual use, the connecting assembly 8 is first removed from the mold 3. Since the second clamping unit 61 included in the clamping assembly 6 near the first end is detachably connected to the mold 3 through the connecting assembly 8, the second clamping unit 61 included in the clamping assembly 6 near the first end is also moved out of the cavity 30 of the mold 3 at the same time as the connecting assembly 8 is removed, leaving space for the metal tube 1 to enter the cavity 30 of the mold 3. Since the second clamping unit 61 included in the clamping assembly 6 near the second end is firmly connected to the inner wall of the mold 3, the first clamping unit 60 and the second clamping unit 61 included in the clamping assembly 6 near the second end are fixed in place in the cavity 30. Next, after the metal tube 1 enters the cavity 30 through the first end of the mold 3, the driving member 610 drives the clamping member 611 to approach the first clamping unit 60, thereby clamping and fixing one end of the metal tube 1 by the clamping assembly 6 near the second end. Next, the connecting component 8 and the clamping component 6 near the first end are installed on the mold 3. The clamping component 611 is driven to move closer to the first clamping unit 60 by the driving component 610, so that the clamping component 6 near the first end clamps and fixes the other end of the metal tube 1.

[0131] Step 104: [The volume is 2824] The aluminum ingots are placed in a melting furnace and heated to 750°C to completely melt them and hold at that temperature for 20 minutes to ensure good fluidity and casting performance.

[0132] Step 105: Activate the induction heating coil installed inside the mold 3 to perform electromagnetic induction heating on the 304 stainless steel seamless tube, heating the 304 stainless steel seamless tube to 800℃.

[0133] Step 106: Start the drive motor, which rotates the mold 3 and the 304 stainless steel seamless tube via the base 4. Pour the molten aluminum from the melting furnace into the casting ladle 91 and mix it with the 304 stainless steel hollow spheres. Then, pour the molten aluminum and 304 stainless steel hollow spheres into the rotating 304 stainless steel seamless tube through the casting channel. During the rotation of the 304 stainless steel seamless tube, the molten aluminum and 304 stainless steel hollow spheres are evenly distributed on the inner wall of the 304 stainless steel seamless tube by centrifugal force, forming a metallurgical bond with the 304 stainless steel seamless tube. The 304 stainless steel hollow spheres are located close to the inner wall of the 304 stainless steel seamless tube, while there are no hollow spheres 20 distributed in the composite tube away from the 304 stainless steel seamless tube.

[0134] Step 107: After casting is completed, turn off the induction heating coil, ensuring that mold 3 continues to rotate. The inner aluminum layer gradually cools and solidifies, forming a stable composite tube. After the composite tube has completely cooled, turn off the drive motor to stop rotation, close the second clamping unit 61, and remove the composite tube from mold 3. Then, cut off the clamping portions at both ends of the composite tube to obtain a complete 304 stainless steel / 6061 aluminum alloy bimetallic hollow sphere composite tube.

[0135] Although the invention has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made therein without departing from the spirit and scope of the invention. Accordingly, this specification and drawings are merely exemplary descriptions of the invention as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. Clearly, those skilled in the art can make various alterations and modifications to the invention without departing from its spirit and scope. Thus, if such modifications and modifications of the invention fall within the scope of the claims and their equivalents, the invention is also intended to include such modifications and modifications.

Claims

1. A processing apparatus for composite pipes, characterized in that, The processing apparatus for the composite pipe includes: A mold, having a cavity extending through the mold along its axial direction; the cavity is used to accommodate the metal tube and / or the composite tube; A base is used to support the mold; a clamping assembly is disposed on the mold and located within the cavity; the clamping assembly is used to clamp and fix the metal tube located within the cavity; A drive assembly for driving the mold to rotate; The clamping assembly includes: A first clamping unit is sleeved inside the mold, and the outer wall of the first clamping unit abuts against the inner wall of the mold; the first clamping unit is used to limit the axial movement of the metal tube and / or the composite tube; The second clamping unit is arranged opposite to the first clamping unit in a direction perpendicular to the axial direction of the mold; the end of the second clamping unit opposite to the first clamping unit moves toward or away from the first clamping unit to clamp and fix or release the metal tube located in the cavity; Along the axial direction of the mold, the mold includes a first end and a second end opposite to each other; the two clamping assemblies are respectively located at the first end and the second end; The second clamping unit included in the clamping assembly near the first end is detachably connected to the mold via a connecting assembly; The second clamping unit included in the clamping assembly near the second end is fastened to the inner wall of the mold; The first clamping unit includes: An annular connector is fitted inside the mold, with the outer wall of the annular connector abutting against the inner wall of the mold. An annular limiting member is fitted inside the annular connecting member; the thickness of the annular limiting member is greater than the thickness of the annular connecting member, and the annular limiting member is used to limit the axial movement of the metal tube and / or the composite tube; the thickness direction of the annular limiting member and the thickness direction of the annular connecting member are both perpendicular to the axial direction of the mold; the width of the annular connecting member is greater than the width of the annular limiting member, and the width direction of the annular connecting member and the width direction of the annular limiting member are both consistent with the axial direction of the mold; The second clamping unit includes: The driving component has a telescopic rod; A clamping member is provided, with the free end of the telescopic rod connected to the clamping member; the driving member is used to drive the clamping member to move closer to or away from the first clamping unit, so as to clamp and fix or release the metal tube. A groove is formed on the outer side wall of the first end of the mold; the connecting assembly includes: The load-bearing component has a load-bearing surface; A first connector is disposed on the bearing surface and engages with the groove. A second connector is disposed on the bearing surface and spaced apart from the first connector; the width of the second connector is greater than the width of the first connector; the width direction of the second connector and the width direction of the first connector are both perpendicular to the axial direction of the mold; the driving member is connected to the side of the second connector closest to the first connector. The processing device for the composite pipe also includes: a telescopic blocking assembly; The telescopic blocking assembly includes: A storage component having a receiving space; the storage component is connected to the side of the drive component opposite to the clamping component; along the axial direction of the mold, the storage component has opposing open ends and closed ends; A telescopic blocking member, the first end of which is connected to the side of the clamping member, and the second end of which passes through the open end and is connected to the closed end; when the driving member drives the clamping member to move closer to or away from the first clamping unit, the telescopic blocking member extends or shortens; the telescopic blocking member located outside the storage member is located between the second clamping unit and the metal substrate.

2. The processing apparatus for composite pipes according to claim 1, characterized in that, The processing apparatus for the composite pipe also includes: A heating element is provided on the mold.

3. A method for preparing a composite tube, characterized in that, Using the processing apparatus for the composite tube according to claim 1 or 2, the method for preparing the composite tube includes: A metal tube, a hollow sphere, and a metal substrate are provided; the melting point of the metal tube and the melting point of the hollow sphere are both greater than the melting point of the metal substrate. The metal substrate is melted to obtain a liquid metal substrate; Centrifugal casting is used to inject the liquid metal substrate and the hollow sphere into the rotating metal tube, so that the liquid metal substrate and the hollow sphere are located on the inner wall of the metal tube and a composite structure with hollow sphere is obtained. The composite structure with hollow spheres is subjected to a cooling treatment to solidify the liquid metal substrate and obtain a composite tube with hollow spheres. The density of the hollow sphere is greater than the density of the liquid metal substrate; in the composite tube, the hollow sphere is close to the inner wall of the metal tube.

4. The method for preparing the composite tube according to claim 3, characterized in that, The liquid metal substrate and the hollow sphere form a metallurgical bond with the metal tube; And / or, the material of the metal tube is different from the material of the metal substrate; And / or, the metal substrate is made of a lightweight metal.

5. The method for preparing the composite tube according to claim 3, characterized in that, The method for preparing the composite tube, before injecting the liquid metal substrate and the hollow sphere into the rotating metal tube using centrifugal casting, further includes: The metal tube is fixed in a mold with a cavity, and the metal tube is heated to obtain a metal tube with a preset temperature. Drive the mold and the metal tube with a preset temperature to rotate; The preset temperature is greater than or equal to 0.6Tm and less than or equal to 0.8Tm; Tm represents the melting point temperature of the metal tube.

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