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CN-117267225-B - Flange connection structure of composite material thin-wall pipe and forming device and method

CN117267225BCN 117267225 BCN117267225 BCN 117267225BCN-117267225-B

Abstract

The invention relates to the technical field of pipe fitting connection, in particular to a composite material thin-wall pipe flange connection structure, a forming device and a forming method, wherein the connection structure comprises a composite material thin-wall pipe and a flange component; the flange assembly comprises a first flange sleeved on the composite material thin-wall pipe and fixedly connected with the inner side of the flange and a second flange fixedly connected with the outer side of the flange, and the diameter of a flange hole of the first flange is the same as the outer diameter of the composite material thin-wall pipe. The through holes are the same in number and in one-to-one correspondence with the first bolt holes arranged on the first flange and the second bolt holes arranged on the second flange. The flange connection structure of the composite material thin-wall pipe has high bonding strength and high connection precision, and can realize high-precision connection between two composite material thin-wall pipes with different pipe diameters.

Inventors

  • ZHAO ZHONGBO
  • YANG BINGBING
  • WANG YUNCHENG
  • WANG YUNZHI
  • WANG XIAOWEN
  • ZHAO DAJUAN
  • YANG LIBO
  • ZHOU ZHENGLIANG

Assignees

  • 南京玻璃纤维研究设计院有限公司

Dates

Publication Date
20260512
Application Date
20230919

Claims (9)

  1. 1. An apparatus for forming a flanged connection of a thin-walled tube of composite material, characterized in that it comprises a support (3) and a fixing (4); The support (3) comprises two support bases (31) and a plurality of support columns (32) positioned between the two support bases (31); The supporting base (31) is provided with a U-shaped clamping groove (311) and a plurality of uniformly distributed positioning holes (312); the U-shaped clamping groove (311) is used for positioning the composite material thin-wall pipe (1); the fixing piece (4) is provided with a plurality of uniformly distributed positioning pins (42); The locating pin (42) is inserted into the locating hole (312) and is used for locating the flange component (2) of the composite material thin-wall pipe flange connection structure; the connecting structure comprises a composite material thin-wall pipe (1) and a flange component (2); The two ends of the composite material thin-wall pipe (1) are uniformly formed with flanges (11), and the flanges (11) are provided with through holes; the flange assembly (2) comprises a first flange (21) sleeved on the composite material thin-wall pipe (1) and fixedly connected with the inner side of the flanging (11) and a second flange (22) fixedly connected with the outer side of the flanging (11); The diameter of the flange hole of the first flange (21) is the same as the outer diameter of the composite material thin-wall pipe (1); The through holes are the same in number and in one-to-one correspondence with first bolt holes (212) formed in the first flange (21) and second bolt holes (222) formed in the second flange (22).
  2. 2. The device according to claim 1, wherein a plurality of the support columns (32) are symmetrically distributed, and/or The width of the U-shaped clamping groove (311) is not smaller than the outer diameter of the composite material thin-wall tube (1).
  3. 3. The device according to claim 1, characterized in that the fixing member (4) is provided in the middle with a circular groove (41) having the same diameter as the first flange (21) and the second flange (22) of the flange assembly (2); The circular groove (41) is used for accommodating the flange assembly (2), and the depth of the groove is equal to the thickness of the flange assembly (2).
  4. 4. A device according to claim 3, characterized in that the positioning pins (42) are uniformly distributed inside the circular grooves (41) in the circumferential direction, in the same number and in a one-to-one correspondence with the positioning holes (312).
  5. 5. The device according to claim 1, characterized in that the wall thickness of the composite material thin-walled tube (1) is 0.2-0.8 mm.
  6. 6. The device according to claim 1, wherein the flange (11) comprises a plurality of folds distributed uniformly in the circumferential direction; the through holes are formed in the turnover part and are uniformly distributed along the circumferential direction.
  7. 7. The device according to claim 6, characterized in that the number n of folds and the radius R of the thin-walled tube (1) of composite material satisfy the following relationship: When R is less than or equal to 40mm, R/n is less than or equal to 1 and less than or equal to 1.5; when R is 40< 200mm or less, R/n is 1.5< 2.5; when R is greater than 200mm, R/n is less than or equal to 3 and is 2.5.
  8. 8. A method of forming a flanged connection of a thin-walled tube of composite material, characterized in that the method is carried out by means of an apparatus according to any of claims 1-7, the method comprising the steps of: Carrying out flanging (11) treatment and punching treatment on the composite material thin-wall pipe (1) to form a flanging (11) with a through hole; Placing the pipe body of the composite material thin-wall pipe (1) in a U-shaped clamping groove (311) so as to position the composite material thin-wall pipe (1); Gluing adhesive on the surfaces of the flanging (11), the first flange (21) and the second flange (22) of the composite material thin-wall pipe (1); and inserting a locating pin (42) into the locating hole (312) to locate the flange assembly (2) so as to improve the connection precision of the composite material thin-wall pipe flange connection structure.
  9. 9. A method according to claim 8, wherein the flanging (11) treatment comprises dividing the mouth of the composite material thin-walled tube (1) equally into a plurality of parts, and then turning the parts outwards when the composite material thin-walled tube is in a malleable state, forming the flanging (11).

Description

Flange connection structure of composite material thin-wall pipe and forming device and method Technical Field The invention relates to the technical field of pipe fitting connection, in particular to a composite material thin-wall pipe flange connection structure, a forming device and a forming method. Background The composite material thin-wall pipe has the advantages of light weight, high bearing capacity, high rigidity, high strength and the like, and is widely used in the fields of electronic information, rail transit, aerospace and the like. Because the composite material thin-wall pipe has the characteristics of thin wall, large length-diameter ratio and the like, complex machining cannot be performed after the structure is formed, and the connection strength with the flange cannot be ensured, so that the connection between the pipe fittings is unstable, the concentricity is low, and the connection precision is further influenced. Chinese patent CN 217843048U discloses a carbon fiber pipe butt joint structure, which needs to set up ring body and hook structure inside the carbon fiber pipe, for the carbon fiber pipe with thin wall and small inner diameter, the forming process is complex, and the strength and forming precision of the ring body cannot be ensured. Chinese patent CN113202849 a discloses a carbon fiber tube and metal joint glue connection structure and metal joint, which needs to set glue injection port on the carbon fiber tube body to destroy fiber structure, resulting in discontinuous structure and affecting the strength of carbon fiber tube. Therefore, there is a need to provide a flange connection structure of a composite material thin-wall pipe, which has high bonding strength and high connection accuracy and does not destroy the continuity of fiber tissues. Disclosure of Invention Aiming at one or more technical problems in the prior art, the invention provides a flange connection structure of a thin-wall pipe made of composite materials, a forming device and a forming method, the flange connection structure of the composite material thin-wall pipe has high bonding strength and high connection precision, does not need to destroy the continuity of fiber tissues, and can realize high-precision connection between two composite material thin-wall pipes with different pipe diameters. The invention provides a flange connection structure of a composite material thin-wall pipe, which comprises a composite material thin-wall pipe 1 and a flange component 2; The two ends of the thin-wall composite pipe 1 are uniformly and integrally formed with flanges 11, and the flanges 11 are provided with through holes; The flange component 2 comprises a first flange 21 which is sleeved on the composite material thin-wall pipe 1 and fixedly connected with the inner side of the flange 11, and a second flange 22 which is fixedly connected with the outer side of the flange 11; the diameter of the flange hole of the first flange 21 is the same as the outer diameter of the composite material thin-wall pipe 1. The through holes are the same in number and in one-to-one correspondence with the first bolt holes 212 provided on the first flange 21 and the second bolt holes 222 provided on the second flange 22. The present invention provides in a second aspect an apparatus for forming a flanged connection of a thin walled tube of composite material according to the first aspect, the apparatus comprising a support member 3 and a fixing member 4; The support 3 comprises two support bases 31 and a plurality of support columns 32 located between the two support bases 31; The supporting base 31 is provided with a U-shaped clamping groove 311 and a plurality of uniformly distributed positioning holes 312; the U-shaped clamping groove 311 is used for positioning the composite material thin-wall pipe 1; The fixing member 4 is provided with a plurality of uniformly distributed positioning pins 42; the positioning pins 42 are inserted into the positioning holes 312 for positioning the flange assembly 2. The present invention provides in a third aspect a method of forming a flanged connection of a thin walled tube of composite material according to the first aspect, the method being carried out by the apparatus of the second aspect, the method comprising the steps of: Carrying out flanging treatment and punching treatment on the composite material thin-wall tube 1 to form a flanging 11 provided with a through hole; Placing the pipe body of the composite material thin-wall pipe 1 in the U-shaped clamping groove 311 to position the composite material thin-wall pipe 1; Gluing adhesive on the surfaces of the flange 11, the first flange 21 and the second flange 22 of the composite material thin-wall pipe 1; the positioning pin 42 is inserted into the positioning hole 312 to position the flange assembly 2, so that the connection precision of the flange connection structure of the composite material thin-wall pipe is improved. Compare