A vibration and noise reduction composite pipe and a preparation method thereof

Abstract

The present application belongs to the technical field of deep-sea vibration and noise reduction shell, and particularly relates to a vibration and noise reduction composite pipe and a preparation method thereof. The vibration and noise reduction composite pipe comprises an outer layer, an intermediate layer and an inner layer which are sequentially sleeved together. The outer layer is a carbon fiber resin composite material pipe. The inner layer is a 316L stainless steel pipe. The intermediate layer is arranged between the outer layer and the inner layer and comprises a micro-perforated aluminum pipe, a Venus flower basket structure and a perforated aluminum pipe which are sequentially sleeved from outside to inside. Graphene epoxy resin is filled between the micro-perforated aluminum pipe and the Venus flower basket structure and between the Venus flower basket structure and the perforated aluminum pipe. The application of the Venus flower basket structure and the micro-perforated aluminum pipe significantly improves the broadband sound absorption and noise reduction effect, especially in low-frequency noise absorption. Compared with the traditional honeycomb structure, the present application has obvious advantages. The intermediate layer of the present application can absorb sound waves in the frequency range of 50-5000 Hz, and the low-frequency absorption efficiency is improved by 40%.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of deep-sea vibration and noise reduction function shell, and particularly relates to a vibration and noise reduction composite pipe and a preparation method thereof. BACKGROUND

[0002] With the exhaustion of onshore and coastal resources, the focus of the marine engineering field gradually shifts from the coastal area to the deep-sea field. The rapid development of deep-sea equipment makes it possible to develop and utilize deep-sea resources on a large scale. In deep-sea equipment, the core components of deep-sea hydraulic power need to be protected by a shell. However, the complex environment of deep sea, such as high pressure, low temperature and high salt, especially the huge underwater pressure, poses great challenges to the design and research of deep-sea pressure-resistant shells.

[0003] Traditional deep-sea pressure-resistant shells are mostly made of single metal materials such as high-strength aluminum alloy and titanium alloy, which have problems such as large volume-weight ratio, easy corrosion and poor low-frequency noise absorption performance. With the advantages of low density, high strength, high specific modulus, fatigue resistance, corrosion resistance and good designability, composite materials make it possible to be used in the design of deep-sea functional shells. Therefore, how to design a functional shell with high strength, corrosion resistance, vibration and noise absorption performance, and ensure the normal operation of the deep-sea hydraulic actuator functional shell in a high-pressure and noisy environment, has become a problem to be solved. SUMMARY

[0004] The application provides a vibration and noise reduction composite pipe and a preparation method thereof.

[0005] To achieve the above purpose, the application adopts the following technical scheme:

[0006] A vibration and noise reduction composite pipe, comprising an outer layer, an intermediate layer and an inner layer which are sequentially sleeved together.

[0007] The outer layer is a carbon fiber epoxy resin composite material pipe.

[0008] The inner layer is a 316L stainless steel pipe.

[0009] The intermediate layer is arranged between the outer layer and the inner layer and comprises a micro-perforated aluminum pipe, a Venus flower basket structure and a perforated aluminum pipe which are sequentially sleeved from outside to inside, and the micro-perforated aluminum pipe and the Venus flower basket structure and the Venus flower basket structure and the perforated aluminum pipe are filled with graphene epoxy resin.

[0010] Further, the density of the outer layer is 1.7-1.9 g / cm3, the thickness is 4-6 mm, and the mass fraction of the epoxy resin is 20%-30%.

[0011] The density of the inner layer is 7.8-8.1 g / cm3, and the thickness is 2-4 mm.

[0012] Further, the micro-perforated aluminum tube and the perforated aluminum tube of the intermediate layer are both made of 6061-T6 aluminum alloy;

[0013] The micro-perforated aluminum tube has a wall thickness of 0.5-1.5 mm, an isosceles right triangle hole shape, an oblique side length of 0.3-0.5 mm, a hole center distance of 2.1-2.3 mm, and a perforation rate of 0.60%-0.70%;

[0014] The Venus flower basket structure has an outer diameter of 98-102 mm and a wall thickness of 1.0-2.0 mm;

[0015] The perforated aluminum tube has a wall thickness of 0.5-1.5 mm, a circular hole shape, a hole diameter of 2.0-3.0 mm, a hole center distance of 4.0-5.0 mm, and a perforation rate of 23%-24%.

[0016] Further, the micro-perforated aluminum tube is provided with two layers, and the micro-holes on the two layers of the micro-perforated aluminum tube are arranged in a staggered manner.

[0017] A preparation method of a vibration and noise reduction composite pipe, comprising the following steps:

[0018] S1, intermediate layer preparation, specifically comprising:

[0019] S11, micro-perforated aluminum tube preparation, comprising:

[0020] S111, using a fiber laser cutting machine to process a 6061-T6 aluminum alloy plate, adopting a skip cutting path to avoid heat accumulation, and monitoring the cutting temperature through an infrared thermal imager to ensure that the cutting temperature is less than 150℃;

[0021] S112, after cutting, the 6061-T6 aluminum alloy plate is subjected to ultrasonic cleaning;

[0022] S113, then the cutting marks on the 6061-T6 aluminum alloy plate are removed through a glass bead sandblasting process;

[0023] S114, the treated 6061-T6 aluminum alloy plate is coiled, and laser positioning is used to ensure that the joints are aligned;

[0024] S115, the coiled 6061-T6 aluminum alloy plate is welded by using a TIG welding process;

[0025] S116, the welded 6061-T6 aluminum alloy plate is subjected to roundness correction and straightness correction to obtain a micro-perforated aluminum tube;

[0026] S12, Venus flower basket structure preparation, comprising:

[0027] S121, printing adhesive strip: using EW-100A alkali-free plain glass cloth as the substrate, using polyimide as the core strip adhesive, forming a glue strip structure with a cell side length of 2.75 mm by means of screen printing; set the width of the glue strip structure to 1.5 mm, the printing speed to 2 m / min, and dry and cure at 80℃±5℃ after printing;

[0028] S122, superposition and curing: superimpose the EW-100A alkali-free plain glass cloth after printing the adhesive strip for 20 layers, and place it in a hot press tank for pressure curing; the pressure curing pressure is 0.5 MPa, the temperature is 120℃, and the time is 2h;

[0029] S123, cell stretching and impregnation: using a stretching machine to perform shaping treatment on the cured superimposed layer, and then filling polyimide resin through a three-time impregnation process to obtain a preform, controlling the mass fraction of polyimide resin to be 30%±2%, and precisely slicing the impregnated preform to make the thickness of the preform 1.0-2.0 mm;

[0030] S124, mold forming: placing the precisely sliced preform in a tubular metal mold, applying a pressure of 1 MPa and curing at 180℃ for 3h to complete the preparation of the Venus flower basket structure;

[0031] S13, preparation of perforated aluminum pipe, including:

[0032] S131, using a numerical control punch to punch the 6061-T6 aluminum alloy plate, setting the single-sided gap of the punch to be 5%-8% of the thickness of the 6061-T6 aluminum alloy plate, and the punching path to spread from the center outward, and then removing burrs with 0.1-0.3 mm ceramic particles after punching;

[0033] S132, curling the punched 6061-T6 aluminum alloy plate, and ensuring the joint alignment through laser positioning;

[0034] S133, using MIG welding process to weld the curled 6061-T6 aluminum alloy plate, and performing heat dissipation treatment on the 6061-T6 aluminum alloy plate during welding to ensure that the temperature is lower than 148.9℃;

[0035] S134, correcting the roundness and straightness of the welded 6061-T6 aluminum alloy plate to obtain a perforated aluminum pipe;

[0036] S14, intermediate layer assembly,

[0037] S141, alignment and fixation: accurately aligning the micro-perforated aluminum pipe, the Venus flower basket structure and the perforated aluminum pipe, and reserving a gap of 0.1-0.2 mm between the micro-perforated aluminum pipe and the Venus flower basket structure and between the Venus flower basket structure and the perforated aluminum pipe;

[0038] S142, resin filling: graphene epoxy resin is injected into the gap at a filling speed of 15 mL / min under a vacuum degree of 0.095 MPa;

[0039] S143, curing process: stepwise temperature rising curing is performed under a pressure of 0.5 MPa, specifically, 80 DEG C for 2 h and 120 DEG C for 1 h, so as to ensure the crosslinking density and interface bonding strength of the graphene epoxy resin; during the curing process, the porosity in the gap between the micro-perforated aluminum pipe and the Venus flower basket structure and between the Venus flower basket structure and the perforated aluminum pipe is controlled to be in the range of 5% to 10% by adjusting the vacuum degree and the filling speed; if the porosity is greater than 15%, secondary resin filling is performed at a filling speed of 5 mL / min to fill the residual pores and improve the structural density, so as to ensure that the porosity in the gap between the micro-perforated aluminum pipe and the Venus flower basket structure and between the Venus flower basket structure and the perforated aluminum pipe is in the range of 5% to 10%, thereby obtaining the intermediate layer.

[0040] S2, the outer layer and the micro-perforated aluminum pipe of the intermediate layer are connected by using a laser connection process, and the perforated aluminum pipe of the intermediate layer and the inner layer are welded together by using an explosive welding process, thereby obtaining the vibration and noise reduction composite pipe.

[0041] Compared with the prior art, the present application has the following advantages:

[0042] The vibration and noise reduction performance is improved: the present application significantly improves the broadband sound absorption and noise reduction effect by using the Venus flower basket structure and the micro-perforated aluminum pipe, especially in the low-frequency noise absorption aspect, which has obvious advantages compared with the traditional honeycomb structure; the intermediate layer of the present application can absorb sound waves in the frequency range of 50 to 5000 Hz, and the low-frequency absorption efficiency is improved by 40%; the present application adopts a multilayer composite structure of an outer layer, an intermediate layer and an inner layer, each layer of material and structure is designed for specific functions, which is scientific in theory and has superiority in vibration and noise reduction.

[0043] The anti-pressure and anti-corrosion performance is improved: the high strength characteristics of the carbon fiber resin composite pipe and the 316L stainless steel pipe are used, so that the application performs well when bearing the high pressure environment of the seabed, and the risk of pipeline deformation and damage is reduced; the material of the carbon fiber resin composite pipe is selected as carbon fiber T700s, which has high strength, low density, excellent corrosion resistance and fatigue resistance, and compared with traditional metal materials such as steel or aluminum alloy, the structural integrity and durability are significantly improved; the 316L stainless steel has excellent corrosion resistance and tensile strength, which can effectively resist the corrosion of salt water and chloride in the marine environment, and at the same time reduce the risk of deformation and damage of the composite pipe; the outer layer of carbon fiber resin composite pipe and the inner layer of 316L stainless steel pipe cooperate, the pressure strength reaches 50MPa, and the service life is prolonged by 50%; the middle layer adopts micro-perforated aluminum pipe, Venus flower basket structure and perforated aluminum pipe, the high strength and impact resistance of glass cloth are combined with aluminum alloy, and the anti-aging and durability of the composite pipe are further enhanced.

[0044] Lightweight design: the outer layer of the application is a carbon fiber resin composite pipe, and the low density characteristics of the carbon fiber resin composite pipe reduce the total weight of the composite pipe, and reduce the installation and maintenance difficulty of the submarine pipeline, and the density of the carbon fiber resin composite pipe is lower than that of metal, and the overall weight is reduced by more than 30%. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 It is a structure diagram of the vibration and noise reduction composite pipe of the application;

[0046] Figure 2 It is a surface structure diagram of the micro-perforated aluminum pipe in the application;

[0047] Figure 3 It is a surface structure diagram of the Venus flower basket structure in the application;

[0048] Figure 4 It is a surface structure diagram of the perforated aluminum pipe in the application;

[0049] In the figure, the outer layer 1, the micro-perforated aluminum pipe 2, the Venus flower basket structure 3, the perforated aluminum pipe 4, and the inner layer 5. DETAILED DESCRIPTION

[0050] In order to further illustrate the technical scheme of the application, the application will be further described below through examples. Example 1

[0051] As shown in Figures 1 to 4 , a vibration and noise reduction composite pipe, comprising an outer layer 1, a middle layer and an inner layer 5 which are sequentially sleeved together;

[0052] The outer layer 1 is a carbon fiber epoxy resin composite pipe, the density of the outer layer 1 is 1.7 g / cm3, the thickness is 4 mm, and the mass fraction of the epoxy resin is 20%;

[0053] The inner layer 5 is a 316L stainless steel pipe, the density of the inner layer 5 is 7.8 g / cm3, and the thickness is 2 mm;

[0054] The intermediate layer is arranged between the outer layer 1 and the inner layer 5, and includes a micro-perforated aluminum pipe 2, a Venus flower basket structure 3 and a perforated aluminum pipe 4 which are sequentially sleeved from outside to inside, and the micro-perforated aluminum pipe 2 and the Venus flower basket structure 3 and the perforated aluminum pipe 4 are filled with graphene epoxy resin; the micro-perforated aluminum pipe 2 and the perforated aluminum pipe 4 of the intermediate layer are both made of 6061-T6 aluminum alloy; the wall thickness of the micro-perforated aluminum pipe 2 is 0.5 mm, the hole shape is an isosceles right triangle, the hypotenuse length is 0.3 mm, the hole center distance is 2.3 mm, and the perforation rate is 0.60%; the outer diameter of the Venus flower basket structure 3 is 98 mm, and the wall thickness is 1.0 mm; the wall thickness of the perforated aluminum pipe 4 is 0.5 mm, the hole shape is a circle, the hole diameter is 2.0 mm, the hole center distance is 5.0 mm, and the perforation rate is 23%.

[0055] A preparation method of a vibration and noise reduction composite pipe, comprising the following steps:

[0056] S1, intermediate layer preparation, specifically comprising:

[0057] S11, micro-perforated aluminum pipe 2 preparation, comprising:

[0058] S111, using a fiber laser cutting machine to process a 6061-T6 aluminum alloy plate, adopting a skip cutting path to avoid heat accumulation, and monitoring the cutting temperature through an infrared thermal imager to ensure that the cutting temperature is less than 150℃;

[0059] S112, after cutting, the 6061-T6 aluminum alloy plate is subjected to ultrasonic cleaning;

[0060] S113, then the cutting marks on the 6061-T6 aluminum alloy plate are removed through a glass bead sandblasting process;

[0061] S114, the treated 6061-T6 aluminum alloy plate is rolled, and laser positioning is used to ensure that the joints are aligned;

[0062] S115, the rolled 6061-T6 aluminum alloy plate is welded by using a TIG welding process;

[0063] S116, the welded 6061-T6 aluminum alloy plate is subjected to roundness correction and straightness correction to obtain the micro-perforated aluminum pipe 2;

[0064] S12, Venus flower basket structure 3 preparation, comprising:

[0065] S121, printing adhesive tape: using EW-100A alkali-free plain glass cloth as the substrate, using polyimide as the core strip adhesive, forming an adhesive tape structure with a cell side length of 2.75 mm by means of screen printing; set the width of the adhesive tape structure to 1.5 mm, the printing speed to 2 m / min, and dry and cure at 80℃±5℃ after printing;

[0066] S122, superimposition and curing: superimpose the EW-100A alkali-free plain glass cloth after printing the adhesive tape for 20 layers, and place it in a hot press tank for pressure curing, with a pressure of 0.5 MPa, a temperature of 120℃, and a time of 2h;

[0067] S123, cell stretching and impregnation: use a stretching machine to perform shaping treatment on the cured superimposed layer, and then fill the polyimide resin through a three-time impregnation process to obtain a preform, control the mass fraction of the polyimide resin to be 30%±2%, and perform precision slicing on the impregnated preform to make the thickness of the preform 1.0 mm;

[0068] S124, mold forming: place the precision sliced preform in a tubular metal mold, apply a pressure of 1 MPa and cure at 180℃ for 3h to complete the preparation of the Venus flower basket structure 3;

[0069] S13, preparation of perforated aluminum pipe 4, comprising:

[0070] S131, use a numerical control punch to punch the 6061-T6 aluminum alloy plate, set the single-sided gap of the punch to be 5% of the thickness of the 6061-T6 aluminum alloy plate, and the punching path to spread from the center outward, and then use 0.1mm ceramic particles to vibrate to remove burrs after punching;

[0071] S132, curl the punched 6061-T6 aluminum alloy plate, and ensure that the seams are aligned through laser positioning;

[0072] S133, use MIG welding process to weld the curled 6061-T6 aluminum alloy plate, and perform heat dissipation treatment on the 6061-T6 aluminum alloy plate during welding to ensure that the temperature is lower than 148.9℃;

[0073] S134, correct the roundness and straightness of the welded 6061-T6 aluminum alloy plate to obtain the perforated aluminum pipe 4;

[0074] S14, intermediate layer assembly,

[0075] S141, bit fixing: accurately align the micro-perforated aluminum pipe 2, the Venus flower basket structure 3 and the perforated aluminum pipe 4, and leave a gap of 0.1mm between the micro-perforated aluminum pipe 2 and the Venus flower basket structure 3, and between the Venus flower basket structure 3 and the perforated aluminum pipe 4;

[0076] S142, resin filling: under the condition of vacuum degree 0.095MPa, inject graphene epoxy resin into the gap at a filling speed of 15mL / min;

[0077] S143, curing process: under the pressure of 0.5MPa, perform stepwise temperature rising curing, specifically: 80℃ curing for 2h, 120℃ curing for 1h, ensure the crosslinking density and interface bonding strength of graphene epoxy resin, and during the curing process, adjust the vacuum degree and filling speed to control the porosity in the gap between the micro-perforated aluminum pipe 2 and the Venus flower basket structure 3, and between the Venus flower basket structure 3 and the perforated aluminum pipe 4 within the range of 5%~10%, if the porosity >10%, then perform secondary resin filling at a filling speed of 5mL / min to fill the residual pores and improve the structural density, ensure the porosity in the gap between the micro-perforated aluminum pipe 2 and the Venus flower basket structure 3, and between the Venus flower basket structure 3 and the perforated aluminum pipe 4 within the range of 5%~10%, and obtain the intermediate layer;

[0078] S2, use laser connection process to connect the outer layer 1 and the micro-perforated aluminum pipe 2 of the intermediate layer, and use explosive welding process to weld the perforated aluminum pipe 4 of the intermediate layer and the inner layer 5 together, and obtain the vibration and noise reduction composite pipe. Example 2

[0079] As shown in Figures 1 to 4 , a vibration and noise reduction composite pipe, comprising an outer layer 1, an intermediate layer and an inner layer 5 which are sequentially sleeved together;

[0080] The outer layer 1 is a carbon fiber epoxy resin composite material pipe, the density of the outer layer 1 is 1.8g / cm³, the thickness is 5mm, and the mass fraction of epoxy resin is 25%;

[0081] The inner layer 5 is a 316L stainless steel pipe, the density of the inner layer 5 is 8.0g / cm³, and the thickness is 3mm;

[0082] The intermediate layer is arranged between the outer layer 1 and the inner layer 5, and comprises a micro-perforated aluminum pipe 2, a Venus flower basket structure 3 and a perforated aluminum pipe 4 which are sequentially sleeved from outside to inside, and the micro-perforated aluminum pipe 2 and the Venus flower basket structure 3 and the perforated aluminum pipe 4 are filled with graphene epoxy resin; the micro-perforated aluminum pipe 2 and the perforated aluminum pipe 4 of the intermediate layer are both made of 6061-T6 aluminum alloy; the wall thickness of the micro-perforated aluminum pipe 2 is 1.0 mm, the hole shape is an isosceles right triangle, the hypotenuse length is 0.4 mm, and the hole center distance is 2.2 mm; the micro-perforated aluminum pipe 2 is provided with two layers, and the micro-holes on the two layers of the micro-perforated aluminum pipe 2 are arranged in a staggered manner; the perforation rate is 0.65%; the outer diameter of the Venus flower basket structure 3 is 100 mm, and the wall thickness is 1.5 mm; the wall thickness of the perforated aluminum pipe 4 is 1.0 mm, the hole shape is a circle, the hole diameter is 2.5 mm, the hole center distance is 4.5 mm, and the perforation rate is 23.5%.

[0083] A preparation method of a vibration and noise reduction composite pipe, comprising the following steps:

[0084] S1, preparation of an intermediate layer, specifically comprising:

[0085] S11, preparation of a micro-perforated aluminum pipe 2, comprising:

[0086] S111, using a fiber laser cutting machine to process a 6061-T6 aluminum alloy plate, adopting a skip cutting path to avoid heat accumulation, and monitoring the cutting temperature through an infrared thermal imager to ensure that the cutting temperature is less than 150℃;

[0087] S112, after cutting, the 6061-T6 aluminum alloy plate is subjected to ultrasonic cleaning;

[0088] S113, then the cutting marks on the 6061-T6 aluminum alloy plate are removed through a glass bead sandblasting process;

[0089] S114, the treated 6061-T6 aluminum alloy plate is rolled, and laser positioning is used to ensure that the joints are aligned;

[0090] S115, the rolled 6061-T6 aluminum alloy plate is welded by using a TIG welding process;

[0091] S116, the welded 6061-T6 aluminum alloy plate is subjected to roundness correction and straightness correction to obtain the micro-perforated aluminum pipe 2;

[0092] S12, preparation of a Venus flower basket structure 3, comprising:

[0093] S121, printing adhesive strip: using EW-100A alkali-free plain glass cloth as the substrate, polyimide as the core strip adhesive, forming a glue strip structure with a cell side length of 2.75 mm by means of screen printing; set the width of the glue strip structure to 1.5 mm, the printing speed to 2 m / min, and dry and cure at 80℃±5℃ after printing;

[0094] S122, superposition and curing: superimpose the EW-100A alkali-free plain glass cloth after printing the adhesive strip for 20 layers, and place it in a hot press tank for pressure curing; the pressure curing pressure is 0.5 MPa, the temperature is 120℃, and the time is 2h;

[0095] S123, cell stretching and impregnation: using a stretching machine to perform shaping treatment on the cured superimposed layer, and then filling polyimide resin through a three-time impregnation process to obtain a preform, controlling the mass fraction of polyimide resin to be 30%±2%, and precisely slicing the impregnated preform to make the thickness of the preform 1.5 mm;

[0096] S124, mold forming: placing the precisely sliced preform in a tubular metal mold, applying a pressure of 1 MPa and curing at 180℃ for 3h to complete the preparation of the Venus flower basket structure 3;

[0097] S13, preparation of perforated aluminum pipe 4, including:

[0098] S131, using a numerical control punch to punch the 6061-T6 aluminum alloy plate, setting the single-sided gap of the punch to 7% of the thickness of the 6061-T6 aluminum alloy plate, and the punching path spreads outward from the center; after punching, use 0.2mm ceramic particles to vibrate to remove burrs;

[0099] S132, curling the punched 6061-T6 aluminum alloy plate, and ensuring the joint alignment through laser positioning;

[0100] S133, using MIG welding process to weld the curled 6061-T6 aluminum alloy plate, and performing heat dissipation treatment on the 6061-T6 aluminum alloy plate during welding to ensure that the temperature is lower than 148.9℃;

[0101] S134, correcting the roundness and straightness of the welded 6061-T6 aluminum alloy plate to obtain a perforated aluminum pipe 4;

[0102] S14, intermediate layer assembly,

[0103] S141, alignment and fixation: accurately aligning the micro-perforated aluminum pipe 2, the Venus flower basket structure 3 and the perforated aluminum pipe 4, and reserving a gap of 0.15mm between the micro-perforated aluminum pipe 2 and the Venus flower basket structure 3, and between the Venus flower basket structure 3 and the perforated aluminum pipe 4;

[0104] S142, resin filling: graphene epoxy resin is injected into the gap at a filling speed of 15 mL / min under a vacuum degree of 0.095 MPa;

[0105] S143, curing process: stepwise temperature rising curing is performed under a pressure of 0.5 MPa, specifically, 80°C for 2 h and 120°C for 1 h, to ensure the crosslinking density and interface bonding strength of the graphene epoxy resin; during the curing process, the porosity in the gap between the micro-perforated aluminum pipe 2 and the Venus flower basket structure 3 and between the Venus flower basket structure 3 and the perforated aluminum pipe 4 is controlled to be within the range of 5% to 10% by adjusting the vacuum degree and the filling speed; if the porosity > 13%, secondary resin filling is performed at a filling speed of 5 mL / min to fill the residual pores and improve the structural density, so that the porosity in the gap between the micro-perforated aluminum pipe 2 and the Venus flower basket structure 3 and between the Venus flower basket structure 3 and the perforated aluminum pipe 4 is within the range of 5% to 10%, to obtain the intermediate layer;

[0106] S2, the outer layer 1 is connected with the micro-perforated aluminum pipe 2 of the intermediate layer by using a laser connection process, and the perforated aluminum pipe 4 of the intermediate layer is welded with the inner layer 5 by using an explosive welding process, to obtain the vibration and noise reduction composite pipe. Example 3

[0107] As shown in Figures 1 to 4 , a vibration and noise reduction composite pipe includes an outer layer 1, an intermediate layer, and an inner layer 5 which are sequentially sleeved together;

[0108] The outer layer 1 is a carbon fiber epoxy resin composite material pipe, the density of the outer layer 1 is 1.9 g / cm³, the thickness is 6 mm, and the mass fraction of the epoxy resin is 30%;

[0109] The inner layer 5 is a 316L stainless steel pipe, the density of the inner layer 5 is 8.1 g / cm³, and the thickness is 4 mm;

[0110] The intermediate layer is arranged between the outer layer 1 and the inner layer 5, and includes a micro-perforated aluminum pipe 2, a Venus flower basket structure 3, and a perforated aluminum pipe 4 which are sequentially sleeved from outside to inside, and the micro-perforated aluminum pipe 2 and the Venus flower basket structure 3 and the perforated aluminum pipe 4 are filled with graphene epoxy resin; the micro-perforated aluminum pipe 2 and the perforated aluminum pipe 4 of the intermediate layer are both made of 6061-T6 aluminum alloy; the wall thickness of the micro-perforated aluminum pipe 2 is 1.5 mm, the hole shape is an isosceles right triangle, the hypotenuse length is 0.5 mm, the hole center distance is 2.1 mm, and the perforation rate is 0.70%; the outer diameter of the Venus flower basket structure 3 is 102 mm, and the wall thickness is 2.0 mm; the wall thickness of the perforated aluminum pipe 4 is 1.5 mm, the hole shape is a circle, the hole diameter is 3.0 mm, the hole center distance is 4.0 mm, and the perforation rate is 24%.

[0111] A preparation method of a vibration and noise reduction composite pipe, comprising the following steps:

[0112] S1, intermediate layer preparation, specifically comprising:

[0113] S11, micro-perforated aluminum pipe 2 preparation, comprising:

[0114] S111, using a fiber laser cutting machine to process a 6061-T6 aluminum alloy plate, adopting a skip cutting path to avoid heat accumulation, and monitoring the cutting temperature through an infrared thermal imager to ensure that the cutting temperature is less than 150℃;

[0115] S112, after cutting, the 6061-T6 aluminum alloy plate is ultrasonically cleaned;

[0116] S113, then the cutting marks on the 6061-T6 aluminum alloy plate are removed through a glass bead sandblasting process;

[0117] S114, the treated 6061-T6 aluminum alloy plate is coiled, and laser positioning is used to ensure that the joints are aligned;

[0118] S115, the coiled 6061-T6 aluminum alloy plate is welded by TIG welding process;

[0119] S116, the welded 6061-T6 aluminum alloy plate is corrected for roundness and straightness to obtain a micro-perforated aluminum pipe 2;

[0120] S12, Venus basket structure 3 preparation, comprising:

[0121] S121, printing adhesive tape: using EW-100A alkali-free plain glass cloth as the base material, using polyimide as the core adhesive, forming an adhesive tape structure with a cell side length of 2.75mm through a screen printing process; the width of the adhesive tape structure is set to 1.5mm, the printing speed is 2m / min, and after printing, it is dried and cured at 80℃±5℃;

[0122] S122, superposition and curing: superimposing 20 layers of EW-100A alkali-free plain glass cloth after printing the adhesive tape, placing it in a hot press tank for pressure curing, the pressure curing pressure is 0.5MPa, the temperature is 120℃, and the time is 2h;

[0123] S123, cell stretching and impregnation: using a stretching machine to shape the superimposed layer, and then filling polyimide resin through a three-time impregnation process to obtain a preform, controlling the mass fraction of polyimide resin to be 30%±2%, and precisely slicing the impregnated preform to make the thickness of the preform be 2.0mm;

[0124] S124, compression molding: the preform after cutting the precise sheet is placed in a tubular metal mold, a pressure of 1 MPa is applied and cured at 180°C for 3h, the preparation of the Venus flower basket structure 3 is completed;

[0125] S13, preparation of the perforated aluminum tube 4, including:

[0126] S131, punching the 6061-T6 aluminum alloy plate using a numerical control punch, setting the single-sided gap of the punch to be 8% of the thickness of the 6061-T6 aluminum alloy plate, and the punching path to spread outward from the center, and then removing burrs by vibrating with 0.3mm ceramic particles after punching;

[0127] S132, curling the punched 6061-T6 aluminum alloy plate and ensuring that the seams are aligned through laser positioning;

[0128] S133, welding the curled 6061-T6 aluminum alloy plate using MIG welding process, and cooling the 6061-T6 aluminum alloy plate during welding to ensure that the temperature is lower than 148.9°C;

[0129] S134, correcting the roundness and straightness of the welded 6061-T6 aluminum alloy plate to obtain the perforated aluminum tube 4;

[0130] S14, assembly of the intermediate layer,

[0131] S141, accurate positioning: accurately positioning the micro-perforated aluminum tube 2, the Venus flower basket structure 3 and the perforated aluminum tube 4, and reserving a gap of 0.2mm between the micro-perforated aluminum tube 2 and the Venus flower basket structure 3, and between the Venus flower basket structure 3 and the perforated aluminum tube 4;

[0132] S142, resin filling: injecting graphene epoxy resin into the gap at a filling speed of 15mL / min under a vacuum degree of 0.095MPa;

[0133] S143, curing process: under a pressure of 0.5MPa, stepwise temperature curing is performed, specifically: 80°C for 2h, 120°C for 1h, to ensure the cross-linking density and interface bonding strength of the graphene epoxy resin, and during the curing process, the porosity in the gap between the micro-perforated aluminum tube 2 and the Venus flower basket structure 3, and between the Venus flower basket structure 3 and the perforated aluminum tube 4 is controlled within the range of 5%~10% by adjusting the vacuum degree and the filling speed, if the porosity >15%, then secondary resin filling is performed at a filling speed of 5mL / min to fill the residual pores and improve the structural density, to ensure that the porosity in the gap between the micro-perforated aluminum tube 2 and the Venus flower basket structure 3, and between the Venus flower basket structure 3 and the perforated aluminum tube 4 is within the range of 5%~10%, to obtain the intermediate layer;

[0134] S2, the outer layer 1 and the micro-perforated aluminum pipe 2 of the intermediate layer are connected by laser connection process, the perforated aluminum pipe 4 of the intermediate layer and the inner layer 5 are welded together by explosion welding process, and the vibration and noise reduction composite pipe is obtained.

[0135] The above shows and describes the main features and advantages of the present application, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0136] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A method for preparing a vibration and noise reduction composite pipe, characterized in that: the vibration and noise reduction composite pipe comprises an outer layer (1), an intermediate layer and an inner layer (5) which are sequentially sleeved together; the outer layer (1) is a carbon fiber epoxy resin composite material pipe; the inner layer (5) is a 316L stainless steel pipe; the intermediate layer is arranged between the outer layer (1) and the inner layer (5) and comprises a micro-perforated aluminum pipe (2), a Venus flower basket structure (3) and a perforated aluminum pipe (4) which are sequentially sleeved from outside to inside, and graphene epoxy resin is filled between the micro-perforated aluminum pipe (2) and the Venus flower basket structure (3) and between the Venus flower basket structure (3) and the perforated aluminum pipe (4); and the method comprises the following steps: S1, intermediate layer preparation, specifically comprising: S11, micro-perforated aluminum pipe (2) preparation, comprising: S111, machining a 6061-T6 aluminum alloy plate by using a fiber laser cutting machine, adopting a skip cutting path to avoid heat accumulation, and monitoring the cutting temperature by using an infrared thermal imager to ensure that the cutting temperature is less than 150℃; S112, after the cutting is completed, the 6061-T6 aluminum alloy plate is subjected to ultrasonic cleaning; S113, then the cutting marks on the 6061-T6 aluminum alloy plate are removed by a glass bead sandblasting process; S114, the treated 6061-T6 aluminum alloy plate is rolled, and laser positioning is used to ensure that the joints are aligned; S115, the rolled 6061-T6 aluminum alloy plate is welded by using a TIG welding process; S116, the welded 6061-T6 aluminum alloy plate is subjected to roundness correction and straightness correction to obtain the micro-perforated aluminum pipe (2); S12, Venus flower basket structure (3) preparation, comprising: S121, printing a rubber strip: using EW-100A alkali-free plain glass cloth as a base material, using polyimide as a core strip rubber, and forming a rubber strip structure with a cell side length of 2.75 mm by a leak printing rubber coating process; setting the width of the rubber strip structure to be 1.5 mm, the printing speed to be 2 m / min, and drying and curing at 80℃±5℃ after printing; S122, lamination and curing: laminating the EW-100A alkali-free plain glass cloth after printing the rubber strip for 20 layers, and placing it in a hot press tank for pressure curing, with a pressure of 0.5 MPa, a temperature of 120℃ and a time of 2h; S123, cell stretching and impregnation: using a stretching machine to shape the laminated body after curing, and then filling polyimide resin by a three-time impregnation process to obtain a preform, controlling the mass fraction of the polyimide resin to be 30%±2%, and precisely slicing the impregnated preform to make the thickness of the preform to be 1.0-2.0 mm; S124, mold forming: placing the precisely sliced preform in a tubular metal mold, applying a pressure of 1 MPa and curing at 180℃ for 3h to complete the preparation of the Venus flower basket structure (3); S13, perforated aluminum pipe (4) preparation, comprising: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ S131, punching the 6061-T6 aluminum alloy plate using a numerical control punch, setting the single-sided gap of the punch to 5-8% of the thickness of the 6061-T6 aluminum alloy plate, and expanding the punching path from the center, after punching, using 0.1-0.3mm ceramic particles to vibrate and remove burrs; S132, curling the punched 6061-T6 aluminum alloy plate and ensuring that the seams are aligned through laser positioning; S133, welding the curled 6061-T6 aluminum alloy plate using MIG welding process, and performing heat dissipation treatment on the 6061-T6 aluminum alloy plate during welding to ensure that the temperature is below 148.9℃; S134, correcting the roundness and straightness of the welded 6061-T6 aluminum alloy plate to obtain a perforated aluminum pipe (4); S14, middle layer assembly, S141, alignment and fixation: accurately aligning the micro-perforated aluminum pipe (2), the Venus flower basket structure (3), and the perforated aluminum pipe (4), and reserving a gap of 0.1-0.2mm between the micro-perforated aluminum pipe (2) and the Venus flower basket structure (3) and between the Venus flower basket structure (3) and the perforated aluminum pipe (4); S142, resin filling: injecting graphene epoxy resin into the gap at a filling speed of 15mL / min under a vacuum degree of 0.095MPa; S143, curing process: under a pressure of 0.5MPa, performing stepwise temperature curing, specifically: 80℃ for 2h, 120℃ for 1h, to ensure the cross-linking density and interface bonding strength of the graphene epoxy resin, and during the curing process, by adjusting the vacuum degree and filling speed, the porosity in the gap between the micro-perforated aluminum pipe (2) and the Venus flower basket structure (3) and between the Venus flower basket structure (3) and the perforated aluminum pipe (4) is controlled within the range of 5-10%, if the porosity >15%, then perform secondary resin filling at a filling speed of 5mL / min to fill the residual pores and improve the structural density, to ensure that the porosity in the gap between the micro-perforated aluminum pipe (2) and the Venus flower basket structure (3) and between the Venus flower basket structure (3) and the perforated aluminum pipe (4) is within the range of 5-10%, to obtain a middle layer; S2, connecting the outer layer (1) and the micro-perforated aluminum pipe (2) of the middle layer using a laser connection process, and welding the perforated aluminum pipe (4) of the middle layer and the inner layer (5) together using an explosive welding process, to obtain a vibration and noise reduction composite pipe.

2. The method of claim 1, wherein the method further comprises: The density of the outer layer (1) is 1.7-1.9g / cm³, the thickness is 4-6mm, and the mass fraction of the epoxy resin is 20-30%; ​ The density of the inner layer (5) is 7.8-8.1g / cm³, and the thickness is 2-4mm.

3. The method of claim 1, wherein the method further comprises: The micro-perforated aluminum pipe (2) and the perforated aluminum pipe (4) of the middle layer are both made of 6061-T6 aluminum alloy; ​ The wall thickness of the micro-perforated aluminum pipe (2) is 0.5-1.5mm, the hole shape is an isosceles right triangle, the hypotenuse length is 0.3-0.5mm, the hole center distance is 2.1-2.3mm, and the perforation rate is 0.60-0.70%. The outer diameter of the Venusian flower-shaped structure (3) is 98-102 mm, and the wall thickness is 1.0-2.0 mm; The wall thickness of the perforated aluminum pipe (4) is 0.5-1.5 mm, the hole shape is circular, the hole diameter is 2.0-3.0 mm, the hole center distance is 4.0-5.0 mm, and the perforation rate is 23%-24%.

4. The method of claim 1, wherein the method further comprises: The micro-perforated aluminum pipe (2) is provided with two layers, and the micro-holes on the two layers of micro-perforated aluminum pipes (2) are arranged in a staggered manner. ​

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