Preparation method of bimetallic composite pipe for vibration reduction and noise reduction

Abstract

The present invention discloses a method for preparing a vibration-damping and noise-reducing bimetallic composite pipe, which relates to the field of metal pipe processing and aims to solve the problem of poor vibration-damping and noise-reducing performance of traditional composite pipes. The preparation method comprises: providing a composite pipe blank, which is a titanium alloy pipe and a stainless steel pipe from the outside to the inside, and the two are fixed by a base, and an annular columnar filling cavity is formed between the titanium alloy pipe, the stainless steel pipe and the base; filling the filling cavity with metal granular material, compacting the metal granular material by a pressing block, and sealing the open end of the filling cavity with a cover plate; hot rolling the composite pipe blank to obtain a first composite pipe blank which is a titanium alloy layer, a porous metal layer and a stainless steel layer from the outside to the inside; and cutting off the pipe section where the base and the cover plate are located to obtain a composite pipe. The porous metal layer formed by the metal granular material has good energy absorption performance and excellent sound insulation and heat insulation performance, so that the prepared bimetallic composite pipe can ultimately achieve the purpose of vibration reduction and noise reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of metal pipe processing, and in particular to a method for preparing a vibration-damping and noise-reducing bimetallic composite pipe. Background Art

[0002] The mature production methods of composite pipes mainly include rolling composite, explosive composite and surfacing composite. Existing bimetallic composite pipes usually use two metal pipes of different materials to directly socket and roll them, so that the two adjacent metals form a metallurgical bond to obtain a composite pipe. Although this traditional composite pipe has high strength and good mechanical properties, it has poor vibration and noise reduction performance. Although plastic pipes have certain vibration reduction performance, they are not as good as metal pipes in terms of high temperature resistance and high pressure resistance. Some existing vibration and noise reduction technologies, such as wrapping sound insulation materials on the outside of the pipe and installing vibration reduction brackets, often can only achieve partial noise reduction effects and cannot solve the fundamental problem. Therefore, it is necessary to develop a new type of composite pipe material and structure to achieve better vibration and noise reduction performance. Summary of the Invention

[0003] The object of the present invention is to provide a method for preparing a vibration-damping and noise-reducing bimetallic composite pipe, so as to improve the vibration-damping and noise-reducing performance of the composite pipe.

[0004] In order to achieve the above object, the present invention provides the following technical solution: a method for preparing a vibration-damping and noise-reducing bimetallic composite pipe, comprising:

[0005] A composite tube blank is provided, which includes a titanium alloy tube and a stainless steel tube in sequence from the outside to the inside. One end of the titanium alloy tube and the stainless steel tube are fixed by a base, and an annular columnar filling cavity is formed between the titanium alloy tube, the stainless steel tube and the base.

[0006] Filling the filling cavity with metal granular material and compacting the metal granular material by pressing the briquette;

[0007] Use a cover plate to seal the open end of the filling cavity;

[0008] Hot rolling the composite tube blank to obtain a first composite tube blank, wherein the first composite tube blank comprises, from the outside to the inside, a titanium alloy layer, a porous metal layer, and a stainless steel layer;

[0009] The base and the cover of the first composite tube are removed to obtain a titanium alloy / stainless steel bimetallic composite tube.

[0010] Optionally, in the above-mentioned method for preparing the vibration-damping and noise-reducing bimetallic composite tube, the metal particle material includes one or more of hollow metal balls, solid metal balls, and metal chips.

[0011] Optionally, in the above-mentioned method for preparing the vibration-damping and noise-reducing bimetallic composite tube, the particle size of the metal particle material is 1 mm to 5 mm;

[0012] The material of the metal particles includes one or more of steel, aluminum, and copper.

[0013] Optionally, in the above-mentioned method for preparing the vibration-damping and noise-reducing bimetallic composite tube, after providing a composite tube blank and before filling the filling cavity with the metal granular material, the preparation method further comprises:

[0014] The inner surface of the titanium alloy tube and the outer surface of the stainless steel tube are shot blasted, high-pressure cleaned, dried and polished until fresh metal is exposed.

[0015] Optionally, in the above-mentioned method for preparing the vibration-damping and noise-reducing bimetallic composite tube, before filling the metal granular material into the filling cavity, the preparation method further comprises:

[0016] The metal particle material is degreased, cleaned and dried to remove the surface oil and oxidation layer of the metal particle material.

[0017] Optionally, in the above-mentioned method for preparing the vibration-damping and noise-reducing bimetallic composite tube, after sealing the open end of the filling cavity and before hot-rolling the composite tube blank, the method further comprises: evacuating the sealed filling cavity.

[0018] Optionally, in the above-mentioned method for preparing the vibration-damping and noise-reducing bimetallic composite tube, hot rolling the composite tube blank to obtain a first composite tube blank comprises:

[0019] Place the composite tube blank in a heating furnace and heat it to 1000℃~1200℃, and keep it warm for 15min~25min to complete the heating of the composite tube blank;

[0020] Dephosphorizing the heated composite tube blank;

[0021] The dephosphorized composite tube billet is rolled to reach a target wall thickness to obtain a first composite tube billet.

[0022] Optionally, in the above-mentioned method for preparing the vibration-damping and noise-reducing bimetallic composite tube, filling the filling cavity with metal granular material and compacting the metal granular material by briquetting includes:

[0023] adding a release agent into the filling cavity, the release agent covering the surface of the base;

[0024] Fill the filling cavity with metal granules, and compact the metal granules at a working pressure of 300MPa~400MPa through briquetting. Repeat the addition and compaction of metal granules for many times;

[0025] When the distance between the surface of the filled metal particles and the opening of the filling cavity is 30mm to 40mm, add the release agent again until the filling cavity is full.

[0026] Removing the base and cover plate of the first composite tube blank includes:

[0027] The base and the pipe section where the cover plate of the first composite pipe blank are located are removed, and the release agent is also removed.

[0028] Optionally, in the above-mentioned method for preparing the vibration-damping and noise-reducing bimetallic composite tube, after removing the tube section where the base and cover plate of the first composite tube blank are located, the method further comprises: flattening and straightening, sizing, and surface treating the first composite tube blank.

[0029] Optionally, in the above-mentioned method for preparing the vibration-damping and noise-reducing bimetallic composite tube, the wall thickness of the filling cavity along the radial direction is 4 mm to 6 mm.

[0030] The wall thickness of the titanium alloy tube, the wall thickness of the stainless steel tube and the wall thickness of the filling cavity along the radial direction are the same.

[0031] Compared with the prior art, when the above technical solution is adopted, the titanium alloy tube and the stainless steel tube are first placed in sequence from the outside to the inside to form a composite tube blank, and one end of the titanium alloy tube and the stainless steel tube are fixed by the base, so that an annular columnar filling cavity is formed between the titanium alloy tube, the stainless steel tube and the base, and then the metal granular material is filled into the filling cavity, and the metal granular material is compacted by a pressing block, and the open end of the filling cavity is sealed and welded, and the composite tube blank is hot rolled to obtain a first composite tube blank including a titanium alloy layer, a porous metal layer and a stainless steel layer from the outside to the inside, and finally the tube section where the base and the cover plate are located is cut off from the first composite tube blank to obtain a titanium alloy. / Stainless steel bimetallic composite pipe, compared with the traditional composite pipe by wrapping the outside with sound insulation material, installing vibration-damping brackets, etc. to reduce vibration and noise, this application fills the metal granular material into the filling cavity, and then performs sealing welding, hot rolling and other processes to make the metal granular material form a porous metal layer. The porous metal layer serves as the core layer of the composite pipe. The honeycomb-like pores formed between the metal granular materials after processing have the advantages of light weight and high strength, good energy absorption performance, excellent heat absorption and sound insulation performance, good corrosion resistance, etc., thereby achieving the purpose of reducing vibration and noise while having the excellent mechanical properties of ordinary bimetallic composite pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 This is a process flow chart of a method for preparing a vibration-damping and noise-reducing bimetallic composite pipe provided in an embodiment of the present invention;

[0034] Figure 2 This is a structural diagram of a composite tube blank in a method for preparing a vibration-damping and noise-reducing bimetallic composite tube provided in an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the structure of step S200 in a method for preparing a vibration-damping and noise-reducing bimetallic composite tube provided in an embodiment of the present invention;

[0036] Figure 4 Schematic diagram of the cross-sectional structure of a first composite tube blank in a method for preparing a vibration-damping and noise-reducing bimetallic composite tube provided in an embodiment of the present invention;

[0037] Figure 5 Schematic diagram of the structure of step S300 in a method for preparing a vibration-damping and noise-reducing bimetallic composite tube provided in an embodiment of the present invention.

[0038] Reference numerals:

[0039] 1-composite tube blank; 11-titanium alloy tube; 12-stainless steel tube; 13-base; 14-filling cavity; 2-pressing block; 3-metal granular material; 4-first composite tube blank; 41-titanium alloy layer; 42-porous metal layer; 43-stainless steel layer; 5-three-roll mill; 51-roller; 52-core rod; 6-mold. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined. "Several" means one or more, unless otherwise specifically defined.

[0043] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and may encompass internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] like Figure 1-Figure 5 As shown, an embodiment of the present invention provides a method for preparing a vibration-damping and noise-reducing bimetallic composite pipe, comprising:

[0046] Step S100: providing a composite tube blank 1. The composite tube blank 1 includes, from the outside to the inside, a titanium alloy tube 11 and a stainless steel tube 12. One end of the titanium alloy tube 11 and the stainless steel tube 12 are fixed by a base 13. An annular cylindrical filling cavity 14 is formed between the titanium alloy tube 11, the stainless steel tube 12, and the base 13.

[0047] Step S200 , filling the filling cavity 14 with metal granular material 3 and compacting the metal granular material 3 with the pressing block 2 ;

[0048] In step S300, the open end of the filling cavity 14 is sealed and welded using a cover plate; wherein, in the process of compacting the metal granular material 3 by the pressing block 2, the metal granular material 3 needs to be continuously filled and filled into the filling cavity 14 until the pressing block 2 squeezes the metal granular material 3 downward, and there is no longer a height gap between the surface of the metal granular material 3 and the open end of the filling cavity 14 along the axial direction of the composite tube blank 1. At this time, the open end of the filling cavity 14 is sealed and welded using the cover plate.

[0049] like Figure 1 and Figure 2As shown, in the process of compacting the metal granular material 3 through the pressing block 2 through the above steps, the composite tube blank 1 needs to be placed in the mold 6, wherein the mold 6 is a cylindrical box structure, and one end of the cylindrical box structure has an opening, the opening is used to place the composite tube blank 1, and the inner wall diameter D1 of the cylindrical box structure is equal to the outer diameter D2 of the composite tube blank 1. During the compaction process, the inner wall of the cylindrical box structure is in uniform contact with the outer wall of the composite tube blank 1, and can provide a relatively uniform restraining force to avoid the metal granular material 3 in the composite tube blank 1 from being subjected to radial outward expansion along the tube wall during the compaction process, causing deformation of the tube wall.

[0050] In step S400, the composite tube blank 1 is hot rolled to obtain a first composite tube blank 4. The first composite tube blank 4 includes, from the outside to the inside, a titanium alloy layer 41, a porous metal layer 42, and a stainless steel layer 43. A good metallurgical bond is formed between the titanium alloy layer 41, the porous metal layer 42, and the stainless steel layer 43 by hot rolling.

[0051] Step S500 : removing the base 13 and the pipe section where the cover plate is located of the first composite tube blank 4 to obtain a titanium alloy / stainless steel bimetallic composite tube.

[0052] When implementing it specifically, Figure 1 As shown, the titanium alloy tube 11 and the stainless steel tube 12 are placed in sequence from the outside to the inside to form a composite tube blank 1, and one end of the titanium alloy tube 11 and the stainless steel tube 12 are fixed by the base 13, so that an annular columnar filling cavity 14 is formed between the titanium alloy tube 11, the stainless steel tube 12 and the base 13, and then the metal granular material 3 is filled into the filling cavity 14, and the metal granular material 3 is compacted by the pressing block 2, and the open end of the filling cavity 14 is sealed and welded, and the composite tube blank 1 is hot rolled to obtain a first composite tube blank 4 including a titanium alloy layer 41, a porous metal layer 42 and a stainless steel layer 43 from the outside to the inside, and finally the first composite tube blank 4 is cut off from the tube section where the base 13 and the cover plate are located. , to obtain a titanium alloy / stainless steel bimetallic composite tube. Compared with the method of directly rolling and compounding two metal tubes of different materials after sleeve connection during the rolling process, the present application forms a porous metal layer 42 of the metal granular material 3 by filling the filling cavity 14 with metal granular material 3 and then performing sealing welding, hot rolling and other processes. The porous metal layer 42 serves as the core layer of the composite tube. The honeycomb-shaped pores formed between the metal granular materials 3 after processing have the advantages of light weight and high strength, good energy absorption performance, excellent heat absorption and sound insulation performance, good corrosion resistance, etc., thereby achieving the purpose of vibration reduction and noise reduction while having the excellent mechanical properties of ordinary bimetallic composite tubes.

[0053] like Figure 2As shown, for example, the inner diameter of the titanium alloy tube 11 can be 60 mm, the inner diameter of the stainless steel tube 12 can be 50 mm, the tube length L1 of the titanium alloy tube 11 and the stainless steel tube 12 are both 200 mm, the wall thickness of the titanium alloy tube 11 and the stainless steel tube 12 are both 5 mm, and they are welded and fixed using a base 13 made of stainless steel, wherein the height L2 of the base 13 along the axial direction of the composite tube 1 can be 2 mm to 4 mm. Of course, the height L2 of the base 13 can be 2 mm, 2.5 mm, 3 mm, 4 mm, etc. Preferably, the height L2 of the base 13 along the axial direction of the composite tube 1 is 2 mm. It is sufficient to ensure sufficient connection strength between the base 13 and the titanium alloy tube 11 and the stainless steel tube 12, that is, the wall thickness d of the composite tube blank 1 is 15 mm, the inner diameter is 50 mm, and the length is 202 mm, so as to form the composite tube blank 1; the metal granular material 3 is placed in the filling cavity 14, and the metal granular material 3 is compacted by the pressing block 2. After reaching the target density, the open end of the filling cavity 14 is sealed and welded; the composite tube blank 1 is hot-rolled to obtain a finished product wall thickness of 10 mm for the first composite tube blank 4; finally, the tube section where the base 13 is located is cut off from the first composite tube blank 4 to obtain a titanium alloy / stainless steel bimetallic composite tube. Of course, the base 13 can also be made of other metal materials.

[0054] It should be noted that, since the metal granular material 3 has a certain particle size, there are pores between adjacent metal granular materials 3. Therefore, the porous metal layer 42 formed after the metal granular material 3 is filled into the filling cavity 14 and subjected to processes such as compaction, sealing welding, and hot rolling is a honeycomb metal structure. The honeycomb metal structure, as the core layer of the composite tube, is composed of a plurality of honeycomb cells. This structure enables the material to have high strength and rigidity while being light in weight. Compared with traditional solid metal materials, it has higher specific strength and specific rigidity and can withstand larger loads at a lower weight cost. When subjected to external force impact, the honeycomb cells of the honeycomb metal structure will deform and collapse, thereby absorbing a large amount of energy. The porous characteristics of the honeycomb metal structure give it a certain degree of permeability. The porous structure inside the honeycomb metal structure can effectively prevent the propagation of sound waves and heat. Sound waves are reflected and absorbed multiple times in the cells, and heat is difficult to conduct due to the air layer in the cells, providing good sound insulation and heat insulation effects, ensuring the structural strength of the titanium alloy / stainless steel bimetallic composite tube.

[0055] Specifically, in this embodiment, the metal granular material 3 includes one or more of hollow metal balls, solid metal balls, and metal chips. Specifically, the metal granular material 3 may be solely hollow metal balls, solid metal balls, or metal chips. Alternatively, the metal granular material 3 may be a mixture of hollow metal balls and solid metal balls, a mixture of hollow metal balls and metal chips, or a mixture of solid metal balls and metal chips. Furthermore, the metal granular material 3 may be a mixture of all three materials: hollow metal balls, solid metal balls, and metal chips. For example, the metal chips may be steel chips, iron chips, or other metal granular materials 3. Since turning chips, milling chips, drilling chips, etc. are present in the machining process of composite pipes, which are inevitable in machining, these iron, steel chips and other waste slags are usually recycled by melting in the existing technology, which results in the problem of waste of metal materials. In addition, in the preparation of traditional composite pipes, directly rolling and compounding two pipes of different materials requires a large rolling force. However, the present application uses waste slag as metal granular material 3 to fill the filling cavity 14, and then performs sealing welding, hot rolling and other processes to make the porous metal layer 42 formed by the metal granular material 3 metallurgically bonded with the titanium alloy layer 41 and the stainless steel layer 43. The metal waste slag generated during the composite pipe processing is used as the material for the preparation of the composite pipe, thereby avoiding the waste of metal materials. The metal balls and metal chips can form a honeycomb metal structure, and the connection strength between the titanium alloy tube 11 and the stainless steel tube 12 can be guaranteed without a large rolling force, which facilitates processing, improves the processing quality of the composite pipe, and reduces the manufacturing cost of the bimetallic composite pipe. Since the particle size of the metal chips is smaller than that of the metal balls, the voids in the porous metal layer 42 formed by the metal chips after processing are smaller than the voids in the porous metal layer 42 formed by the metal balls after processing.

[0056] Specifically, in this embodiment, the particle size of the metal granular material 3 is 1 mm to 5 mm. Exemplarily, the particle size of the metal granular material 3 can be 1 mm, 1.5 mm, 3 mm, 4 mm, 5 mm, etc. Preferably, the particle size of the metal granular material 3 is 1 mm. The operator can flexibly select the particle size of the metal granular material 3 to be filled according to the processing requirements, so that the composite pipe can withstand a larger load at a lower weight cost through the porous metal layer 42 compared to traditional solid metal materials, and has higher strength and rigidity. Among them, the material of the metal granular material 3 includes one or more of steel, aluminum, and copper. That is, the material of the metal granular material 3 can be only steel, aluminum, or copper. The material of the metal granular material 3 can also be a mixture of steel and aluminum, a mixture of steel and copper, or a mixture of aluminum and copper. The material of the metal granular material 3 can also be a mixture of steel, aluminum, and copper. Of course, the material of the metal granular material 3 is not limited to the metals listed in this solution.

[0057] In some embodiments, after providing a composite tube blank 1 in step S100 and before filling the filling cavity 14 with the metal granular material 3 in step S200, the preparation method further includes: shot blasting, high-pressure cleaning, drying, and polishing the inner surface of the titanium alloy tube 11 and the outer surface of the stainless steel tube 12 until fresh metal is exposed. The operator can use polishing equipment to shot blast, high-pressure clean, dry, and polish the oxide scale on the surface of the titanium alloy tube 11 and the surface of the stainless steel tube 12 in the composite tube blank 1. The exposed fresh metal can ensure the connection strength between the titanium alloy tube 11 and the stainless steel tube 12 and the filled metal granular material 3.

[0058] Furthermore, in this embodiment, before filling the filling cavity 14 with the metal granular material 3 in step S200, the preparation method further includes degreasing, cleaning, and drying the metal granular material 3 to remove surface oil and oxide layers. This step ensures that adjacent metal granular materials 3 are well bonded together, thereby ensuring good structural stability and reliability between the formed porous metal layer 42 and the titanium alloy layer 41 and stainless steel layer 43.

[0059] In some embodiments, after sealing the open end of the filling cavity 14 in step S200 and before hot rolling the composite tube 1 in step S300, the preparation method further includes: evacuating the sealed filling cavity 14. The operator compacts the filled metal granular material 3 using the briquetting 2 to achieve a specified density, and then seals the open end of the filling cavity 14. During the sealing process, a hole for evacuation may be reserved. After the sealed filling cavity 14 is evacuated to a vacuum, the hole is sealed to prevent oxidation of the metal granular material 3 in the filling cavity 14 when heated at high temperatures.

[0060] Specifically, in this embodiment, hot rolling the composite tube blank 1 in step S400 to obtain the first composite tube blank 4 includes:

[0061] Step S401: Place the composite tube blank 1 in a heating furnace and heat it to 1000° C. to 1200° C., and keep it at this temperature for 15 to 25 minutes to complete the heating of the composite tube blank 1;

[0062] Step S402, dephosphorizing the heated composite tube 1;

[0063] In step S403 , the dephosphorized composite tube blank 1 is rolled to reach a target wall thickness to obtain a first composite tube blank 4 .

[0064] like Figure 5As shown, the first composite tube blank 4 is obtained through the above steps S401 to S403. Preferably, the heating temperature is 1200°C and the holding time is 20 minutes. The heating temperature is greater than 1000°C and the holding time is greater than 15 minutes, so that the material of the composite tube blank 1 can be heated evenly and has good processability, which is convenient for subsequent rolling by the three-roll mill 5. After the mandrel 52 of the three-roll mill 5 passes through the center of the composite tube blank 1, the composite tube blank 1 is rolled by the roller 51 to reach the target wall thickness, and the first composite tube blank 4 can be obtained; the heating temperature is less than 1200°C and the holding time is less than 25 minutes, both of which can avoid excessive heating affecting the toughness of the composite tube blank 1 material and reduce the waste of resources in the preparation process; the composite tube blank 1 is dephosphorized before rolling to improve the surface quality and smoothness of the composite tube blank 1, and prevent the iron oxide scale from being pressed into the roller 51 during the rolling process, causing defects such as concave and convex marks, shedding, and cracks on the surface of the finished product.

[0065] In some embodiments, filling the filling cavity 14 with the metal granular material 3 and compacting the metal granular material 3 with the pressing block 2 in step S200 includes:

[0066] In step S201, an isolation agent is added into the filling cavity 14, and the isolation agent covers the surface of the base 13; wherein, the thickness of the isolation agent covering the surface of the base 13 is 30 mm to 40 mm. Exemplarily, the thickness of the isolation agent covering the surface of the base 13 can be 30 mm, 33 mm, 35 mm, 38 mm, 40 mm, etc., as long as the covering thickness of the isolation agent can effectively separate the base 13 from the metal granular material 3 so that they do not adhere to each other.

[0067] In step S202, metal granular material 3 is filled into the filling cavity 14, and the metal granular material 3 is compacted at a working pressure of 300 MPa to 400 MPa through the briquetting 2, and the metal granular material 3 is repeatedly added and compacted; wherein, the working pressure of the briquetting 2 can be 300 MPa, 350 MPa, 380 MPa, 400 MPa, etc. If the working pressure of the briquetting 2 is less than 300 MPa, the pressure is too small, the metal granular material 3 is not compacted tightly, the gap is large, the material filling is not dense, the material formed by hot rolling has a large cavity, and there is a large gap in the combination with the titanium alloy tube 11 and the stainless steel tube 12, which affects the structural strength, and the working efficiency of the compaction process is low; if the working pressure of the briquetting 2 is greater than 400 MPa, the pressure is too high, the metal granular material 3 is filled too densely, and it is not easy to form a honeycomb-shaped porous metal layer 42 after hot rolling. Therefore, considering that the metal granular material 3 is compacted tightly and can form a honeycomb-shaped porous metal layer 42 , the working pressure of the briquetting 2 is selected to be 300 MPa to 400 MPa.

[0068] In step S203, when the distance between the surface of the filled metal granular material 3 and the opening end of the filling cavity 14 is 30 mm to 40 mm, release agent is added again until the filling cavity 14 is completely filled. The distance between the surface of the filled metal granular material 3 and the opening end of the filling cavity 14 can be 30 mm, 33 mm, 35 mm, 40 mm, etc., as long as the filling thickness of the release agent can effectively separate the cover plate and the metal granular material 3 and prevent adhesion.

[0069] Through the above steps, after the composite tube 1 undergoes sealing welding, hot rolling, and other processes, the release agent does not bond with the base 13, cover plate, and metal granular material 3 in the composite tube 1 during the hot rolling process, thereby preventing the base 13 from bonding to the metal granular material 3, and the cover plate from bonding to the metal granular material 3. Therefore, the release agent facilitates the removal of the base 13 and cover plate, eliminating the need for cutting and other processes, reducing wear on the ends of the composite tube 1 and facilitating operation. The release agent can be made of graphite or other insulating materials, as long as the release agent's material can isolate the base 13 and cover plate from the metal granular material 3 and prevent them from bonding.

[0070] Furthermore, in this embodiment, removing the base 13 and cover plate sections of the first composite tube 4 in step S500 includes removing the base 13 and cover plate sections of the first composite tube 4 and removing the release agent. This step facilitates removal of the base 13 and cover plate sections. Because the release agent is not adhered to the honeycomb metal structure, the operator can directly remove the structure at the release agent site to obtain the titanium alloy / stainless steel bimetallic composite tube, facilitating operation.

[0071] In this embodiment, after removing the base 13 and the cover plate section of the first composite tube 4 in step S500, the preparation method further includes flattening, straightening, sizing, and surface treating the first composite tube 4. These finishing steps ensure a flat and smooth surface, thereby improving the smoothness and corrosion resistance of the titanium alloy / stainless steel bimetallic composite tube.

[0072] like Figure 4As shown, specifically, in this embodiment, the radial wall thickness of the filling cavity 14 is 4 mm to 6 mm. Exemplarily, the radial wall thickness L3 of the filling cavity 14 can be 4 mm, 4.5 mm, 5 mm, 6 mm, etc. Preferably, the radial wall thickness L3 of the filling cavity 14 is 5 mm. The radial wall thickness L3 of the filling cavity 14 is greater than 4 mm, so that the porous metal layer 42 obtained after hot rolling has sufficient bonding strength with the titanium alloy layer 41 and the stainless steel layer 43; the radial wall thickness L3 of the filling cavity 14 is less than 6 mm, so as to avoid deformation of the titanium alloy / stainless steel bimetallic composite tube when subjected to external force due to excessive wall thickness of the porous metal layer 42, thereby ensuring that the titanium alloy / stainless steel bimetallic composite tube has sufficient structural strength.

[0073] Specifically, in this embodiment, the wall thickness of the titanium alloy tube 11, the wall thickness of the stainless steel tube 12, and the radial wall thickness of the filling cavity 14 are the same. Operators can flexibly control the thickness ratios of the titanium alloy layer 41, the porous metal layer 42, and the stainless steel layer 43 based on production requirements, ensuring structural stability and reducing the production cost of the titanium alloy / stainless steel bimetallic composite tube.

[0074] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for preparing a vibration-damping and noise-reducing bimetallic composite pipe, characterized in that: include: A composite tube blank is provided, wherein the composite tube blank includes a titanium alloy tube and a stainless steel tube in sequence from the outside to the inside, one end of the titanium alloy tube and the stainless steel tube are fixed by a base, and an annular columnar filling cavity is formed between the titanium alloy tube, the stainless steel tube and the base; adding a release agent into the filling cavity, wherein the release agent covers the surface of the base; Filling the filling cavity with metal granular material, wherein the metal granular material includes one or more of hollow metal balls, solid metal balls, and metal chips, and compacting the metal granular material at a working pressure of 300 MPa to 400 MPa by briquetting, and repeatedly adding and compacting the metal granular material; When the distance between the surface of the filled metal granular material and the open end of the filling cavity is 30 mm to 40 mm, adding the release agent again until the filling cavity is filled; Using a cover plate to seal the open end of the filling cavity; Hot rolling the composite tube blank to obtain a first composite tube blank, the first composite tube blank comprising, from the outside to the inside, a titanium alloy layer, a porous metal layer, and a stainless steel layer; the porous metal layer serving as the core layer of the first composite tube blank forms a honeycomb-like pore structure between the metal granular materials after processing; The base and the pipe section where the cover plate of the first composite tube blank are located are removed, and the release agent is removed to obtain a titanium alloy / stainless steel bimetallic composite tube.

2. The method for preparing a vibration-damping and noise-reducing bimetallic composite pipe according to claim 1, characterized in that: The particle size of the metal granular material is 1 mm to 5 mm; The material of the metal particle material includes one or more of steel, aluminum, and copper.

3. The method for preparing a vibration-damping and noise-reducing bimetallic composite pipe according to claim 1, characterized in that: After providing a composite tube blank and before filling the filling cavity with metal granular material, the preparation method further includes: The inner surface of the titanium alloy tube and the outer surface of the stainless steel tube are shot blasted, high-pressure cleaned, dried and polished until fresh metal is exposed.

4. The method for preparing a vibration-damping and noise-reducing bimetallic composite pipe according to claim 1, characterized in that: Before filling the filling cavity with metal granular material, the preparation method further includes: The metal particle material is degreased, cleaned, and dried to remove surface oil and oxidation layer of the metal particle material.

5. The method for preparing the vibration-damping and noise-reducing bimetallic composite pipe according to claim 1, characterized in that: After sealing the open end of the filling cavity and before hot rolling the composite tube blank, the preparation method further comprises: evacuating the sealed filling cavity.

6. The method for preparing a vibration-damping and noise-reducing bimetallic composite pipe according to any one of claims 1 to 5, characterized in that: The hot rolling of the composite tube blank to obtain a first composite tube blank comprises: The composite tube blank is placed in a heating furnace and heated to 1000° C. to 1200° C., and kept warm for 15 min to 25 min to complete the heating of the composite tube blank; Dephosphorizing the heated composite tube blank; The dephosphorized composite tube blank is rolled to reach a target wall thickness to obtain the first composite tube blank.

7. The method for preparing a vibration-damping and noise-reducing bimetallic composite pipe according to any one of claims 1 to 5, characterized in that: After removing the base and the tube section where the cover plate of the first composite tube blank are located, the preparation method further comprises: flattening, straightening, sizing and surface treating the first composite tube blank.

8. The method for preparing a vibration-damping and noise-reducing bimetallic composite pipe according to any one of claims 1 to 5, characterized in that: The wall thickness of the filling cavity in the radial direction is 4 mm to 6 mm; The wall thickness of the titanium alloy tube, the wall thickness of the stainless steel tube, and the wall thickness of the filling cavity along the radial direction are the same.

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