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CN-121989507-A - Novel composite pipe forming process

CN121989507ACN 121989507 ACN121989507 ACN 121989507ACN-121989507-A

Abstract

The invention discloses a novel composite pipe forming process, which relates to the technical field of metal material processing, and comprises an inner pipe, an outer pipe, a composite interface agent layer, a high-molecular anaerobic adhesive and high-temperature brazing material, wherein the inner pipe is made of a first metal material, the outer pipe is made of a second metal material, the second metal material is different from the first metal material, the composite interface agent layer is arranged between the inner pipe and the outer pipe and is formed by compounding high-molecular anaerobic adhesive and high-temperature brazing material, the composite interface agent layer is uniformly distributed between the inner pipe and the outer pipe, the thickness of the composite interface agent layer is 0.01-0.5 mm, and the tight connection between the inner pipe and the outer pipe is realized through a specific manufacturing process. According to the invention, the high molecular anaerobic adhesive and the high-temperature brazing material are adopted as the composite interface agent, and the novel manufacturing process and the novel drawing process are combined, so that the connection strength and the high-temperature resistance between the inner pipe and the outer pipe are remarkably improved, the manufacturing cost is reduced, the production process is simplified, the high molecular anaerobic adhesive and the high-temperature brazing material can be widely applied to various fields, and the high-temperature brazing material has good practicability and market potential by replacing part of the traditional welding process.

Inventors

  • QIAN FENG
  • CHEN YAXI
  • Xue Zhengzhong

Assignees

  • 南通汇錱新材料科技有限公司

Dates

Publication Date
20260508
Application Date
20260224

Claims (10)

  1. 1. A novel composite tube, comprising: an inner tube (1) made of a first metal material; An outer tube (2) made of a second metal material, which is different from the first metal material; The composite interface agent layer (3) is arranged between the inner tube (1) and the outer tube (2) and is formed by compounding high-molecular anaerobic adhesive and high-temperature brazing material; the composite interfacial agent layer (3) is uniformly distributed between the inner tube (1) and the outer tube (2), and the thickness of the composite interfacial agent layer (3) is 0.01mm to 0.5mm.
  2. 2. The novel composite pipe as claimed in claim 1, wherein the polymer anaerobic adhesive is methacrylate anaerobic adhesive, and the shearing strength after solidification is more than or equal to 10MPa.
  3. 3. The novel composite pipe as claimed in claim 1, wherein the high-temperature brazing material is silver-based brazing material or copper-based brazing material, and the melting point range is 600-900 ℃.
  4. 4. The novel composite pipe according to claim 1, wherein the inner pipe (1) is made of one of stainless steel, copper alloy or titanium alloy, and the outer pipe (2) is made of one of carbon steel, aluminum alloy or nickel base alloy.
  5. 5. The novel composite pipe according to claim 1, wherein the mass ratio of the high polymer anaerobic adhesive to the high-temperature brazing material in the composite interface agent layer (3) is 1:1-3, and the thickness of the composite interface agent layer (3) is 0.1mm.
  6. 6. A molding process for manufacturing the novel composite pipe according to any one of claims 1 to 5, comprising the steps of: Firstly, uniformly coating high molecular anaerobic adhesive on the outer surface of an inner pipe (1), and forming a stable adhesive layer by utilizing the characteristic of rapid solidification of the high molecular anaerobic adhesive at room temperature; Then, the outer tube (2) is sleeved on the inner tube (1) to ensure uniform gap between the two tubes; Then, coating high-temperature brazing material on the composite interface agent layer (3); at the moment, the drawing process after the initial setting of the interfacial agent is matched, so that the inner layer and the outer layer are tightly attached, and the forming quality and the connecting strength of the composite pipe are further ensured; And finally, placing the assembled composite pipe into a high-temperature furnace for brazing treatment, so that high-temperature brazing material is melted at high temperature and fills the gap between the inner pipe (1) and the outer pipe (2) to form metallurgical bonding.
  7. 7. The process for forming a novel composite pipe according to claim 6, wherein the outer surface of the inner pipe (1) and the inner surface of the outer pipe (2) are sandblasted or chemically cleaned before the composite pipe is formed, and the surface roughness Ra is less than or equal to 1.6 μm.
  8. 8. The process for forming a novel composite pipe according to claim 6, wherein the coating amount of the polymer anaerobic adhesive is 50-100 g/m2, and the curing time is 10-30 min.
  9. 9. The novel composite pipe molding process of claim 6, wherein the drawing process is characterized in that a hydraulic drawing machine is adopted, and radial pressure of 5-15 MPa is applied to the composite pipe after the interfacial agent is initially set, so that the inner pipe (1) and the outer pipe (2) are tightly attached.
  10. 10. The process for forming the novel composite pipe according to claim 6, wherein the high-temperature furnace is used for brazing, the composite pipe is placed in a protective atmosphere or a vacuum environment, heated to a brazing temperature of 600-900 ℃, kept for 5-15 min, and cooled to below 200 ℃ along with a furnace, so that the novel composite pipe is obtained.

Description

Novel composite pipe forming process Technical Field The invention relates to the technical field of metal material processing, in particular to a novel composite pipe forming process. Background In the industrial field, in order to meet specific use requirements, such as corrosion resistance, high strength, light weight, etc., it is often necessary to compound metal pipes of different materials together. The seamless metal composite pipe with the layered structure comprises a composite pipe body and a metal layer, wherein the composite pipe body consists of low-strength coating metal and high-strength base metal, the low-strength coating metal can be arranged in a single layer or in double layers, the low-strength coating metal can be arranged on the inner side or the outer side of the high-strength base metal under the single-layer coating, the low-strength coating metal is arranged on the inner side and the outer side of the high-strength base metal under the double-layer coating, the corrosion resistance is ensured, the compressive strength of a pipe fitting is improved, and the common metal composite pipe manufacturing process in the market at present mostly adopts a single connection mode. The traditional manufacturing method of the metal composite pipe mainly comprises mechanical connection, welding, explosion compounding and the like, and although the use requirements are met to a certain extent, the problems of insufficient connection strength, poor high temperature resistance, high manufacturing cost and the like exist often, for example: the mechanical connection modes such as threads, expansion joint and the like are easy to loosen, and the tightness and the pressure resistance are insufficient; Welding processes such as arc welding, laser welding and the like are easy to cause deformation of a heat affected zone, and have poor welding adaptability to dissimilar metals; The explosion compounding cost is high, the process is complex, and the large-scale application is difficult. Therefore, there is a need for a manufacturing process that has high connection strength, high temperature resistance, low cost, and is suitable for dissimilar metal compounding, and development of a novel, efficient, low-cost multi-material metal composite tube that can meet various performance requirements, and a manufacturing process thereof have urgent practical demands and important technical values. In view of the above, intensive studies have been conducted to solve the above problems. Disclosure of Invention The invention aims to provide a novel composite pipe forming process, which aims to solve the problems of low connection strength, poor high temperature resistance, difficult combination of dissimilar metals, need to maintain the simplicity and high efficiency of the process and the like in the traditional metal composite pipe manufacturing process. In order to achieve the above purpose, the invention provides a novel composite pipe, comprising: an inner tube made of a first metal material; An outer tube made of a second metal material, the second metal material being different from the first metal material; the composite interface agent layer is arranged between the inner pipe and the outer pipe and is formed by compounding high-molecular anaerobic adhesive and high-temperature brazing material; the composite interfacial agent layer is uniformly distributed between the inner tube and the outer tube, and the thickness of the composite interfacial agent layer is 0.01mm to 0.5mm. Preferably, the high molecular anaerobic adhesive is methacrylate anaerobic adhesive, and the shearing strength after solidification is more than or equal to 10MPa. By adopting the technical scheme, the high-molecular anaerobic adhesive has good adhesive property and corrosion resistance, can be rapidly solidified at room temperature, forms a stable adhesive layer, and provides primary connection strength for the inner pipe and the outer pipe. Preferably, the high-temperature brazing material is silver-based brazing material or copper-based brazing material, and the melting point range is 600-900 ℃. By adopting the technical scheme, the high-temperature brazing material has good high-temperature resistance and welding strength, and can form metallurgical bonding with a metal material at high temperature, so that the connection strength between the inner tube and the outer tube is further enhanced. Preferably, the inner tube is made of one of stainless steel, copper alloy or titanium alloy, and the outer tube is made of one of carbon steel, aluminum alloy or nickel-based alloy. By adopting the technical scheme, the inner pipe and the outer pipe can be made of different metal materials, such as stainless steel, carbon steel, copper alloy and the like, so as to meet the requirements under different use environments. Preferably, the mass ratio of the high polymer anaerobic adhesive to the high-temperature brazing material in the composite i