Preparation method of vibration and noise reduction bimetal composite pipe

Abstract

The invention discloses a preparation method of a vibration and noise reduction bimetal composite pipe, relates to the field of metal pipe processing, and aims to solve the problem of poor vibration and noise reduction performance of a traditional composite pipe. The preparation method comprises the steps that a composite pipe blank is provided and sequentially comprises a titanium alloy pipe and a stainless steel pipe from outside to inside, the titanium alloy pipe and the stainless steel pipe are fixed through a base, and an annular columnar filling cavity is defined by the titanium alloy pipe, the stainless steel pipe and the base; the filling cavity is filled with metal particle materials, the metal particle materials are compacted through a pressing block, and the open end of the filling cavity is sealed and welded through a cover plate; hot rolling is conducted on the composite pipe blank, and a first composite pipe blank sequentially comprising a titanium alloy layer, a porous metal layer and a stainless steel layer from outside to inside is obtained; and cutting off the pipe section of the base and the cover plate to obtain the composite pipe. And the porous metal layer formed by the metal particle material has good energy absorption performance and excellent sound insulation and heat insulation performance, so that the prepared bimetal composite pipe finally achieves the purposes of vibration and noise reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of metal pipe processing, and particularly relates to a preparation method of a vibration and noise reduction bimetallic composite pipe. Background Art

[0002] The mature production methods of composite pipes mainly include rolling composite, explosive composite, and surfacing composite, etc. The existing bimetallic composite pipes usually adopt direct socket rolling of two metal pipes with different materials, so that the metals of adjacent two materials form metallurgical bonding to obtain a composite pipe. Although this traditional composite pipe has high strength and good mechanical properties, its vibration and noise reduction performance is poor. Although plastic pipes have certain vibration reduction performance, they are inferior to metal pipes in terms of high temperature and high pressure resistance. And some existing vibration and noise reduction technologies, such as wrapping sound insulation materials outside the pipe and installing vibration reduction brackets, etc., often can only achieve partial noise reduction effect 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 purpose of the present invention is to provide a preparation method of a vibration and noise reduction bimetallic composite pipe for improving the vibration and noise reduction performance of the composite pipe.

[0004] In order to achieve the above purpose, the present invention provides the following technical solutions: A preparation method of a vibration and noise reduction bimetallic composite pipe, comprising: Providing a composite pipe blank, the composite pipe blank sequentially includes a titanium alloy pipe and a stainless steel pipe from outside to inside, one ends of the titanium alloy pipe and the stainless steel pipe are fixed by a base, and a ring-shaped columnar filling cavity is formed among the titanium alloy pipe, the stainless steel pipe and the base; Filling metal particle materials into the filling cavity and compacting the metal particle materials by a pressing block; Using a cover plate to seal and weld the open end of the filling cavity; Performing hot rolling on the composite pipe blank to obtain a first composite pipe blank, the first composite pipe blank sequentially includes a titanium alloy layer, a porous metal layer and a stainless steel layer from outside to inside; Removing the pipe sections where the base and the cover plate of the first composite pipe blank are located to obtain a titanium alloy / stainless steel bimetallic composite pipe.

[0005] Optionally, in the above preparation method of the vibration and noise reduction bimetallic composite pipe, the metal particle materials include one or more of hollow metal balls, solid metal balls, and metal chips.

[0006] Optionally, in the above preparation method of the vibration and noise reduction bimetallic composite pipe, the particle size of the metal particle materials is 1 mm to 5 mm; The materials of the metal particles include one or more of steel, aluminum, and copper.

[0007] Optionally, in the method for preparing the vibration damping and noise reduction bimetallic composite pipe, after providing a composite pipe blank and before filling the filling cavity with metal particle material, the preparation method further includes: Shot peening, high-pressure cleaning, drying and grinding are performed on the inner surface of the titanium alloy pipe and the outer surface of the stainless steel pipe until fresh metal is exposed.

[0008] Optionally, in the method for preparing the vibration damping and noise reduction bimetallic composite pipe, before filling the filling cavity with metal particle material, the preparation method further includes: The metal particle material is degreased, cleaned and dried to remove the surface oil and oxide layer of the metal particle material.

[0009] Optionally, in the method for preparing the vibration damping and noise reduction bimetallic composite pipe, after sealing and welding the open end of the filling cavity and before hot rolling the composite pipe blank, the preparation method further includes: evacuating the sealed filling cavity.

[0010] Optionally, in the method for preparing the vibration damping and noise reduction bimetallic composite pipe, hot rolling the composite pipe blank to obtain a first composite pipe blank includes: Putting the composite pipe blank into a heating furnace and heating it to 1000°C - 1200°C, and holding it for 15 min - 25 min to complete the heating of the composite pipe blank; Descaling the heated composite pipe blank; Rolling the descaled composite pipe blank to reach the target wall thickness to obtain a first composite pipe blank.

[0011] Optionally, in the method for preparing the vibration damping and noise reduction bimetallic composite pipe, filling the filling cavity with metal particle material and compacting the metal particle material by a pressing block includes: Adding a release agent into the filling cavity, and the release agent covers the surface of the base; Filling the filling cavity with metal particle material, and compacting the metal particle material under a working pressure of 300 MPa - 400 MPa by a pressing block, and repeatedly adding metal particle material and compacting it for multiple times; When the distance between the surface of the filled metal particle material and the open end of the filling cavity is 30 mm - 40 mm, adding the release agent again until the filling cavity is full; Removing the pipe sections where the base and the cover plate of the first composite pipe blank are located includes: Removing the pipe sections where the base and the cover plate of the first composite pipe blank are located, and removing the release agent.

[0012] Optionally, in the method for preparing the vibration damping and noise reduction bimetallic composite pipe, after removing the pipe sections where the base and the cover plate of the first composite pipe blank are located, the preparation method further includes: leveling, straightening, sizing and surface treatment of the first composite pipe blank.

[0013] Optionally, in the preparation method of the vibration and noise reduction bimetallic composite pipe described above, the wall thickness of the filling cavity in the radial direction is 4 mm to 6 mm.

[0014] The wall thickness of the titanium alloy pipe, the wall thickness of the stainless steel pipe, and the wall thickness of the filling cavity in the radial direction are the same.

[0015] Compared with the prior art, when adopting the above technical solution, first place the titanium alloy pipe and the stainless steel pipe from outside to inside in sequence to form a composite pipe blank, fix one end of the titanium alloy pipe and the stainless steel pipe through the base, so that an annular columnar filling cavity is formed between the titanium alloy pipe, the stainless steel pipe and the base, then fill the filling cavity with metal particle materials, compact the metal particle materials through a pressing block, seal and weld the open end of the filling cavity, and perform hot rolling on the composite pipe blank to obtain a first composite pipe blank including a titanium alloy layer, a porous metal layer and a stainless steel layer from outside to inside in sequence. Finally, cut off the pipe sections where the base and the cover plate are located from the first composite pipe blank to obtain the titanium alloy / stainless steel bimetallic composite pipe. Compared with the traditional composite pipe that reduces vibration and noise by wrapping sound insulation materials outside and installing vibration reduction brackets, etc., in this application, by filling the metal particle materials into the filling cavity and then performing processes such as seal welding and hot rolling, the metal particle materials form a porous metal layer. The honeycomb-shaped lattice formed between the metal particle materials after processing by the porous metal layer as the core layer of the composite pipe has the advantages of light weight, high strength, good energy absorption performance, excellent heat absorption and sound insulation performance, good corrosion resistance, etc., so as to achieve the purpose of vibration and noise reduction while having excellent mechanical properties of the ordinary bimetallic composite pipe. Description of the Drawings

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings: Figure 1 It is a process flow chart of a preparation method of a vibration and noise reduction bimetallic composite pipe provided in an embodiment of the present invention; Figure 2 It is a structural diagram of a composite pipe blank in a preparation method of a vibration and noise reduction bimetallic composite pipe provided in an embodiment of the present invention; Figure 3 It is a schematic structural diagram of step S200 in a preparation method of a vibration and noise reduction bimetallic composite pipe provided in an embodiment of the present invention; Figure 4 It is a schematic cross-sectional structural diagram of a first composite pipe blank in a preparation method of a vibration and noise reduction bimetallic composite pipe provided in an embodiment of the present invention; Figure 5 It is a schematic structural diagram of step S300 in a preparation method of a vibration and noise reduction bimetallic composite pipe provided in an embodiment of the present invention.

[0017] Reference numerals: 1 - Composite tube blank; 11 - Titanium alloy tube; 12 - Stainless steel tube; 13 - Base; 14 - Filling cavity; 2 - Press block; 3 - Metal particulate material; 4 - First composite tube blank; 41 - Titanium alloy layer; 42 - Porous metal layer; 43 - Stainless steel layer; 5 - Three - roll mill; 51 - Roll; 52 - Mandrel; 6 - Die. Detailed implementation manners

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be 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 used to limit the present invention.

[0019] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can 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 can be directly connected to the other element or indirectly connected to the other element.

[0020] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. "Several" means one or more unless otherwise specifically defined.

[0021] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.

[0022] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Such asFigures 1-5 As shown in the figure, a preparation method of a vibration damping and noise reduction bimetallic composite pipe provided by an embodiment of the present invention includes: Step S100: Provide a composite pipe blank 1, which sequentially includes a titanium alloy pipe 11 and a stainless steel pipe 12 from outside to inside. One end of the titanium alloy pipe 11 and the stainless steel pipe 12 is fixed by a base 13, and a ring-shaped columnar filling cavity 14 is formed between the titanium alloy pipe 11, the stainless steel pipe 12 and the base 13; Step S200: Fill the filling cavity 14 with a metal particle material 3, and compact the metal particle material 3 by a pressing block 2; Step S300: Use a cover plate to seal and weld the open end of the filling cavity 14; wherein, during the process of compacting the metal particle material 3 by the pressing block 2, it is necessary to continuously fill and fill the filling cavity 14 with the metal particle material 3 until there is no height gap along the axial direction of the composite pipe blank 1 between the surface of the metal particle material 3 and the open end of the filling cavity 14 when the pressing block 2 presses the metal particle material 3 downward. At this time, the open end of the filling cavity 14 is sealed and welded by the cover plate.

[0024] As Figure 1 and Figure 2 shown, during the process of compacting the metal particle material 3 by the pressing block 2 through the above steps, the composite pipe blank 1 needs to be placed in a mold 6. The mold 6 is a columnar box structure with an opening at one end for placing the composite pipe blank 1, and the inner wall diameter D1 of the columnar box structure is equal to the outer diameter D2 of the composite pipe blank 1. During the compacting process, the inner wall of the columnar box structure uniformly contacts the outer wall of the composite pipe blank 1, which can provide a relatively uniform binding force to prevent the metal particle material 3 in the composite pipe blank 1 from expanding radially outward along the pipe wall and causing the pipe wall to deform.

[0025] Step S400: Hot-roll the composite pipe blank 1 to obtain a first composite pipe blank 4, which sequentially includes a titanium alloy layer 41, a porous metal layer 42 and a stainless steel layer 43 from outside to inside; wherein, good metallurgical bonding is formed between the titanium alloy layer 41, the porous metal layer 42 and the stainless steel layer 43 through hot rolling.

[0026] Step S500: Remove the pipe sections where the base 13 and the cover plate of the first composite pipe blank 4 are located to obtain a titanium alloy / stainless steel bimetallic composite pipe.

[0027] Specifically, when implemented, as Figure 1As shown in the figure, first, the titanium alloy tube 11 and the stainless steel tube 12 are placed from outside to inside in sequence to form a composite tube blank 1. One end of the titanium alloy tube 11 and the stainless steel tube 12 is fixed by a base 13, so that an annular columnar filling cavity 14 is formed among the titanium alloy tube 11, the stainless steel tube 12 and the base 13. Then, a metal particle material 3 is filled into the filling cavity 14, the metal particle material 3 is compacted by a pressing block 2, and the opening end of the filling cavity 14 is sealed by welding. 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 outside to inside in sequence. Finally, the tube sections where the base 13 and the cover plate are located are cut off from the first composite tube blank 4 to obtain a titanium alloy / stainless steel bimetal composite tube. Compared with the method of directly rolling and compounding two metal tubes with different materials sleeved together during the rolling process, in this application, by filling the metal particle material 3 into the filling cavity 14 and then performing processes such as sealing by welding and hot rolling, the metal particle material 3 forms a porous metal layer 42. The honeycomb-shaped lattice formed among the metal particle materials 3 after processing with the porous metal layer 42 as the core layer of the composite tube has the advantages of light weight, high strength, good energy absorption performance, excellent heat absorption and sound insulation performance, and good corrosion resistance. Therefore, while having excellent mechanical properties of ordinary bimetal composite tubes, the purpose of vibration reduction and noise reduction is achieved.

[0028] As Figure 2 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 lengths L1 of both the titanium alloy tube 11 and the stainless steel tube 12 are 200 mm, and the wall thicknesses of both the titanium alloy tube 11 and the stainless steel tube 12 are 5 mm. The base 13 made of stainless steel is used for welding and fixing. Among them, the height L2 of the base 13 along the axial direction of the composite tube blank 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 blank 1 is 2 mm. As long as the connection strength between the base 13 and the titanium alloy tube 11 and the stainless steel tube 12 is sufficient, that is, the wall thickness d of the formed composite tube blank 1 is 15 mm, the inner diameter is 50 mm, and the length is 202 mm to form the composite tube blank 1; the metal particle material 3 is put into the filling cavity 14, and the metal particle material 3 is compacted by the pressing block 2. After reaching the target density, the opening end of the filling cavity 14 is sealed by welding; the composite tube blank 1 is hot-rolled to obtain a finished 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 bimetal composite tube. Of course, the base 13 can also be made of other metal materials.

[0029] It should be noted that since the metal particle material 3 has a certain particle size and there are pores between adjacent metal particle materials 3, the porous metal layer 42 formed after filling the metal particle material 3 into the filling cavity 14 through 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 pipe, consists of multiple honeycomb-shaped cells. This structure enables the material to have high strength and stiffness even with a relatively light weight, and has a higher specific strength and specific stiffness compared to traditional solid metal materials, being able to withstand larger loads at a lower weight cost. When subjected to external force impacts, 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 endow it with a certain permeability. The porous structure inside the honeycomb metal structure can effectively block the propagation of sound waves and heat. Sound waves are reflected and absorbed multiple times within the cells, and heat conduction is also difficult due to the air layer within the cells, providing good sound insulation and heat insulation effects and ensuring the structural strength of the titanium alloy / stainless steel bimetallic composite pipe.

[0030] Specifically, in this embodiment, the metal particle material 3 includes one or more of hollow metal balls, solid metal balls, and metal chips. That is, the metal particle material 3 can only use hollow metal balls, solid metal balls, or metal chips. The metal particle material 3 can also use a mixture of hollow metal balls and solid metal balls, a mixture of hollow metal balls and metal chips, a mixture of solid metal balls and metal chips. The metal particle material 3 can also use a mixture of hollow metal balls, solid metal balls, and metal chips simultaneously. Exemplarily, the metal chips can be steel chips, iron chips, or other metal particle materials 3. Since there are turning chips, milling chips, drilling chips, etc. during the machining process of the composite pipe, which are inevitable in machining, in the prior art, these iron, steel chips and other waste residues are usually recycled by melting in a furnace, resulting in waste of metal materials. And in the preparation of traditional composite pipes, directly rolling and compounding two pipes of different materials requires a large rolling force. However, in this application, by filling the waste residues as the metal particle material 3 into the filling cavity 14 and then performing processes such as sealing welding and hot rolling, the porous metal layer 42 formed by the metal particle material 3 is metallurgically bonded to the titanium alloy layer 41 and the stainless steel layer 43. Using the metal waste residues generated during the processing of the composite pipe as the material for preparing the composite pipe, thus avoiding waste of metal materials. And both metal balls and metal chips can form a honeycomb metal structure, ensuring the connection strength between the titanium alloy pipe 11 and the stainless steel pipe 12 without the need for a large rolling force, facilitating processing, improving the processing quality of the composite pipe, and reducing the manufacturing cost of the bimetallic composite pipe. Among them, since the particle size of the metal chips is smaller than that of the metal balls, the voids of the porous metal layer 42 formed by the metal chips after processing are smaller than those of the porous metal layer 42 formed by the metal balls after processing.

[0031] Specifically, in this embodiment, the particle size of the metal particle material 3 is 1 mm to 5 mm. Exemplarily, the particle size of the metal particle material 3 can be 1 mm, 1.5 mm, 3 mm, 4 mm, 5 mm, etc. Preferably, the particle size of the metal particle material 3 is 1 mm. The operator can flexibly select the particle size of the metal particle material 3 to be filled according to the processing requirements, so that the composite pipe can bear a larger load at a smaller weight cost through the porous metal layer 42 compared with the traditional solid metal material, and has higher strength and stiffness. Among them, the material of the metal particle material 3 includes one or more of steel, aluminum, and copper. That is, the material of the metal particle material 3 can only use steel, aluminum, or copper. The material of the metal particle material 3 can also use a mixture of steel and aluminum, a mixture of steel and copper, a mixture of aluminum and copper. The material of the metal particle material 3 can also use a mixture of steel, aluminum, and copper at the same time. Of course, the material of the metal particle material 3 is not limited to the metals listed in this solution.

[0032] In some embodiments, after providing a composite pipe blank 1 in step S100 and before filling the metal particle material 3 into the filling cavity 14 in step S200, the preparation method further includes: shot peening, high-pressure cleaning, drying, and polishing the inner surface of the titanium alloy pipe 11 and the outer surface of the stainless steel pipe 12 until fresh metal is exposed. The operator can use a polishing device to perform shot peening, high-pressure cleaning, drying, and polishing on the oxide scale on the surface of the titanium alloy pipe 11 and the stainless steel pipe 12 in the composite pipe blank 1. The exposed fresh metal can ensure the connection strength between the titanium alloy pipe 11 and the stainless steel pipe 12 and the filled metal particle material 3.

[0033] Further, in this embodiment, before filling the metal particle material 3 into the filling cavity 14 in step S200, the preparation method further includes: degreasing, cleaning, and drying the metal particle material 3 to remove the surface oil and oxide layer of the metal particle material 3. Through this step, a good bonding effect is achieved between adjacent metal particle materials 3, so as to ensure good structural stability and reliability between the formed porous metal layer 42 and the titanium alloy layer 41 and the stainless steel layer 43.

[0034] In some embodiments, after welding the open end of the filling cavity 14 in step S200 and before hot rolling the composite pipe blank 1 in step S300, the preparation method further includes: evacuating the sealed filling cavity 14. The operator compacts the filled metal particle material 3 through the pressing block 2. After reaching the specified density, the open end of the filling cavity 14 is welded. A hole for evacuating can be reserved during welding. When the sealed filling cavity 14 is evacuated, the hole is then blocked to prevent the metal particle material 3 in the filling cavity 14 from being oxidized when heated at high temperature.

[0035] Specifically, in this embodiment, the hot rolling of the composite tube blank 1 in step S400 to obtain the first composite tube blank 4 includes: Step S401: Put the composite tube blank 1 into a heating furnace and heat it to 1000°C - 1200°C, and keep it warm for 15 min - 25 min to complete the heating of the composite tube blank 1; Step S402: Remove phosphorus from the heated composite tube blank 1; Step S403: Roll the phosphorus-removed composite tube blank 1 to reach the target wall thickness to obtain the first composite tube blank 4.

[0036] As Figure 5 shown, the first composite tube blank 4 is obtained through the above steps S401 - S403. Preferably, the heating temperature is 1200°C and the holding time is 20 min. When the heating temperature is greater than 1000°C and the holding time is greater than 15 min, the material of the composite tube blank 1 can be heated evenly, having good workability and facilitating the subsequent rolling work by the three-roll mill 5. Among them, 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 roll 51 to reach the target wall thickness, and then the first composite tube blank 4 can be obtained; when the heating temperature is less than 1200°C and the holding time is less than 25 min, it can avoid overheating and affecting the toughness of the material of the composite tube blank 1, reducing the waste of resources in the preparation process; removing phosphorus from the composite tube blank 1 before rolling can improve the surface quality and finish of the composite tube blank 1, preventing the scale from being pressed into by the roll 51 during rolling, resulting in defects such as surface unevenness, peeling, and cracks on the finished product.

[0037] In some embodiments, filling the metal particle material 3 into the filling cavity 14 and compacting the metal particle material 3 by the pressing block 2 in step S200 includes: Step S201: Add a release agent into the filling cavity 14, and the release agent covers the surface of the base 13; wherein, the covering thickness of the release agent on the surface of the base 13 is 30 mm - 40 mm. Exemplarily, the covering thickness of the release agent on the surface of the base 13 can be 30 mm, 33 mm, 35 mm, 38 mm, 40 mm, etc., as long as it is ensured that the covering thickness of the release agent can effectively separate the base 13 from the metal particle material 3 and prevent adhesion.

[0038] Step S202: Fill the metal particle material 3 into the filling cavity 14, and compact the metal particle material 3 under a working pressure of 300 MPa to 400 MPa by the pressing block 2. Add the metal particle material 3 and compact it repeatedly for multiple times. Among them, the working pressure of the pressing block 2 can be 300 MPa, 350 MPa, 380 MPa, 400 MPa, etc. If the working pressure of the pressing block 2 is less than 300 MPa, the pressure is too small, the metal particle material 3 is not compacted tightly, there are large voids, the material filling is not dense, and there are large cavities in the material formed by hot rolling. There are large voids 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 pressing block 2 is greater than 400 MPa, the pressure is too large, the metal particle material 3 is filled too densely, and it is not easy to form a honeycomb-like porous metal layer 42 after hot rolling. Therefore, considering that the metal particle material 3 is compacted tightly and can form a honeycomb-like porous metal layer 42, the working pressure of the pressing block 2 is selected to be 300 MPa to 400 MPa.

[0039] Step S203: When the distance between the surface of the filled metal particle material 3 and the open end of the filling cavity 14 is 30 mm to 40 mm, add the release agent again until the filling cavity 14 is full. Among them, the distance between the surface of the filled metal particle material 3 and the open end of the filling cavity 14 can be 30 mm, 33 mm, 35 mm, 40 mm, etc., as long as it is ensured that the filling thickness of the release agent can effectively separate the cover plate and the metal particle material 3 without adhesion.

[0040] Through the above steps, after the composite tube blank 1 undergoes processes such as sealing welding and hot rolling, the release agent does not combine with the base 13, the cover plate, and the metal particle material 3 in the composite tube blank 1 during processes such as hot rolling. No combination is formed between the base 13 and the metal particle material 3 and between the cover plate and the metal particle material 3. Therefore, the base 13 and the cover plate can be conveniently disassembled through the release agent, without the need for processes such as cutting, reducing the material wear at both ends of the composite tube blank 1 and facilitating the operation. Among them, the release agent can be graphite or other release materials, as long as it is ensured that the material of the release agent can separate the base 13 and the cover plate from the metal particle material 3 and does not participate in the combination.

[0041] Further, in this embodiment, removing the tube sections where the base 13 and the cover plate of the first composite tube blank 4 are located in step S500 includes: removing the tube sections where the base 13 and the cover plate of the first composite tube blank 4 are located and removing the release agent. Through this step, it is convenient to remove the tube sections where the base 13 and the cover plate are located. Since the material of the release agent does not adhere to the honeycomb metal structure, the operator can directly remove the structure at the release agent to obtain a titanium alloy / stainless steel bimetallic composite tube, which is convenient for operation.

[0042] In this embodiment, after removing the base 13 and the pipe section where the cover plate of the first composite pipe blank 4 are removed in step S500, the preparation method further includes: leveling, straightening, sizing and surface treatment of the first composite pipe blank 4. Through the finishing processes such as leveling, straightening, sizing and surface treatment in this step, the surface of the composite pipe can be ensured to be flat and smooth, so as to improve the appearance flatness and corrosion resistance of the titanium alloy / stainless steel bimetal composite pipe.

[0043] As Figure 4 shown, specifically, in this embodiment, the wall thickness of the filling cavity 14 in the radial direction is 4 mm to 6 mm. Exemplarily, the wall thickness L3 of the filling cavity 14 in the radial direction can be 4 mm, 4.5 mm, 5 mm, 6 mm, etc. Preferably, the wall thickness L3 of the filling cavity 14 in the radial direction is 5 mm. The wall thickness L3 of the filling cavity 14 in the radial direction is greater than 4 mm, so that there is sufficient bonding strength between the porous metal layer 42 obtained after hot rolling and the titanium alloy layer 41 and the stainless steel layer 43; the wall thickness L3 of the filling cavity 14 in the radial direction is less than 6 mm, avoiding deformation of the titanium alloy / stainless steel bimetal composite pipe when it is impacted by external force due to the too large wall thickness of the porous metal layer 42, and ensuring that the titanium alloy / stainless steel bimetal composite pipe has sufficient structural strength.

[0044] Specifically, in this embodiment, the wall thickness of the titanium alloy pipe 11, the wall thickness of the stainless steel pipe 12 and the wall thickness of the filling cavity 14 in the radial direction are the same. The operator can flexibly control the thickness ratio of the titanium alloy layer 41, the porous metal layer 42 and the stainless steel layer 43 according to the production requirements, ensuring the stability of the structure and reducing the production and manufacturing cost of the titanium alloy / stainless steel bimetal composite pipe.

[0045] In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0046] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A preparation method of a vibration and noise reduction bimetallic composite pipe, characterized in that, Comprising: Providing a composite tube blank, the composite tube blank sequentially comprising a titanium alloy tube and a stainless steel tube from outside to inside, one ends of the titanium alloy tube and the stainless steel tube being fixed by a base, and an annular columnar filling cavity being formed among the titanium alloy tube, the stainless steel tube and the base; Filling metal particulate material into the filling cavity, and compacting the metal particulate material by a pressing block; Using a cover plate to seal and weld the open end of the filling cavity; Performing hot rolling on the composite tube blank to obtain a first composite tube blank, the first composite tube blank sequentially comprising a titanium alloy layer, a porous metal layer and a stainless steel layer from outside to inside; Removing the tube sections where the base and the cover plate of the first composite tube blank are located to obtain a titanium alloy / stainless steel bimetal composite tube.

2. The preparation method of the vibration damping and noise reduction bimetallic composite pipe according to claim 1, characterized in that The metal particulate material includes one or more of hollow metal balls, solid metal balls and metal chips.

3. The preparation method of the vibration damping and noise reduction bimetal composite pipe according to claim 1, characterized in that, The particle size of the metal particulate material is 1 mm to 5 mm; The material of the metal particulate material includes one or more of steel, aluminum and copper.

4. The preparation method of the vibration damping and noise reduction bimetallic composite pipe according to claim 1, characterized in that After providing the composite tube blank and before filling the metal particulate material into the filling cavity, the preparation method further includes: Performing shot peening, high-pressure cleaning, drying treatment and grinding on the inner surface of the titanium alloy tube and the outer surface of the stainless steel tube until fresh metal is exposed.

5. The preparation method of the vibration damping and noise reduction bimetal composite pipe according to claim 1, characterized in that, Before filling the metal particulate material into the filling cavity, the preparation method further includes: Performing degreasing, cleaning and drying on the metal particulate material to remove the surface oil and oxide layer of the metal particulate material.

6. The preparation method of the vibration damping and noise reduction bimetal composite pipe according to claim 1, characterized in that, After sealing and welding the open end of the filling cavity and before performing hot rolling on the composite tube blank, the preparation method further includes: evacuating the sealed filling cavity.

7. The preparation method of the vibration and noise reduction bimetallic composite pipe according to any one of claims 1-6, characterized in that, Performing hot rolling on the composite tube blank to obtain a first composite tube blank, including: Placing the composite tube blank in a heating furnace and heating it to 1000°C to 1200°C, and holding for 15 min to 25 min to complete the heating of the composite tube blank; Performing descaling on the heated composite tube blank; Rolling the descaled composite tube blank to a target wall thickness to obtain the first composite tube blank.

8. The preparation method of the vibration damping and noise reduction bimetallic composite pipe according to any one of claims 1-6, characterized in that, Filling metal particulate material into the filling cavity, and compacting the metal particulate material by a pressing block, including: Adding a release agent into the filling cavity, the release agent covering the surface of the base; Filling the metal particulate material into the filling cavity, and compacting the metal particulate material under a working pressure of 300 MPa to 400 MPa by a pressing block, and performing multiple repeated additions of the metal particulate material and compacting; When the distance between the surface of the filled metal particulate 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; Removing the tube sections where the base and the cover plate of the first composite tube blank are located, including: Removing the tube sections where the base and the cover plate of the first composite tube blank are located, and removing the release agent.

9. The preparation method of the vibration damping and noise reduction bimetallic composite pipe according to any one of claims 1-6, characterized in that, After removing the tube sections where the base and the cover plate of the first composite tube blank are located, the preparation method further includes: performing leveling, straightening, sizing and surface treatment on the first composite tube blank.

10. The preparation method of the vibration damping and noise reduction bimetallic composite pipe according to any one of claims 1-6, 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 in the radial direction are the same.

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