CN114633078A - Method for manufacturing metal corrugated pipe - Google Patents
Method for manufacturing metal corrugated pipe Download PDFInfo
- Publication number
- CN114633078A CN114633078A CN202210375813.3A CN202210375813A CN114633078A CN 114633078 A CN114633078 A CN 114633078A CN 202210375813 A CN202210375813 A CN 202210375813A CN 114633078 A CN114633078 A CN 114633078A
- Authority
- CN
- China
- Prior art keywords
- forming
- manufacturing
- frame body
- pipe fitting
- corrugated pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 239000002184 metal Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 9
- 238000003475 lamination Methods 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000003466 welding Methods 0.000 abstract description 20
- 238000005336 cracking Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000005096 rolling process Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 9
- 230000009471 action Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/02—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by pressing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/021—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube having a rectangular cross-section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/025—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube with several corrugations
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a method for manufacturing a metal corrugated pipe, which comprises the following steps of placing a pipe fitting in a closed and detachable forming frame body, wherein the inner wall of the forming frame body is provided with a plurality of layers of forming grooves for forming corrugations; a roller matched with the forming groove is placed in the pipe fitting and moves along the forming groove to extrude the pipe fitting, and the pipe fitting is extruded and formed into a corrugated pipe through the roller; and disassembling the molding frame body to take out the corrugated pipe. Compared with the existing manufacturing method of forming four sides separately and then welding and fixing, the invention can obtain a whole-circle complete corrugated structure by one-time rolling forming, has simpler steps and higher processing efficiency, is beneficial to reducing the number of welding seams, and further can reduce the problems of welding stress concentration and welding seam cracking.
Description
Technical Field
The invention relates to a pipe fitting manufacturing method, in particular to a metal corrugated pipe manufacturing method.
Background
The box body of the tunnel type sterilization dryer is generally connected with the box body by adopting a rectangular expansion ring so as to buffer the deformation of the box body in a high-temperature environment. At present, four sides of a commonly used rectangular expansion ring are separately molded, then four-side corrugated pipes are welded together to form the rectangular expansion ring, the manufacturing method is complicated in steps and low in efficiency, more welding seams of the formed expansion ring exist, stress concentration exists in the welding position, the wall thickness of the expansion ring generally needs to be larger than 0.5mm in order to weld the expansion ring conveniently, the expansion ring is poor in expansion performance due to the factors, and cracking is easy to generate under the high-temperature condition.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for manufacturing a metal corrugated pipe, which has simple steps, is beneficial to improving the processing efficiency, reducing the number of welding seams and reducing the cracking probability.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for manufacturing a metal corrugated pipe comprises the steps of placing a pipe fitting in a closed and detachable forming frame body, wherein a plurality of layers of forming grooves for forming corrugations are formed in the inner wall of the forming frame body; a roller matched with the forming groove is placed in the pipe fitting and moves along the forming groove to extrude the pipe fitting, and the pipe fitting is extruded and formed into a corrugated pipe through the roller; and disassembling the molding frame body to take out the corrugated pipe.
As a further improvement of the above technical solution: and bending a strip-shaped plate to enable two ends to be in butt joint and welded and fixed to form the pipe fitting.
As a further improvement of the above technical solution: and the two ends of the plate are welded by laser.
As a further improvement of the above technical solution: and the roller is sequentially rolled and formed from bottom to top according to the set track and each circle of displacement.
As a further improvement of the above technical solution: and after the corrugated pipe is taken out, the two end faces of the corrugated pipe are cut to be smooth.
As a further improvement of the above technical solution: the molding frame body comprises more than two groups of mold split bodies, and a positioning structure is arranged between the mold split bodies and detachably connected with the mold split bodies.
As a further improvement of the above technical solution: the die split body comprises a plurality of stacked layers, and the forming grooves are formed in the stacked layers.
As a further improvement of the technical scheme: the positioning structure comprises positioning grooves arranged on the lamination of one group of the mold split bodies and positioning convex parts arranged on the lamination of the other group of the mold split bodies, and the positioning convex parts are arranged in the positioning grooves in a one-to-one correspondence mode.
As a further improvement of the above technical solution: connecting parts are arranged at two ends of the lamination, and fastening pieces penetrate through the connecting parts.
As a further improvement of the above technical solution: the cross section of the pipe fitting is rectangular, square or circular, and the forming frame body is a rectangular frame body, a square frame body or a circular frame body.
Compared with the prior art, the invention has the advantages that: the invention discloses a manufacturing method of a metal corrugated pipe, which is characterized in that a pipe fitting is placed in a forming frame with a forming groove, the forming frame is used for providing restraint for the pipe fitting, then a roller wheel is used for moving along the forming groove and extruding the pipe fitting, so that a whole circle of corrugated structure can be obtained on the pipe fitting, the corrugated pipe can be taken out after the forming frame is disassembled, and compared with the existing manufacturing method that four sides are formed separately and then welded and fixed, the manufacturing method can obtain a whole circle of complete corrugated structure through one-step rolling forming, has simpler steps and higher processing efficiency, is beneficial to reducing the number of welding seams, and can further reduce the problems of welding stress concentration and welding seam cracking.
Drawings
Fig. 1 is a schematic perspective view of a method for manufacturing a metal bellows according to the present invention.
Fig. 2 is a schematic perspective view of a forming frame body according to the method for manufacturing a metal bellows of the present invention.
Fig. 3 is a partially enlarged view of fig. 2.
Fig. 4 is a schematic structural diagram of a plate material according to the method for manufacturing a metal corrugated pipe of the present invention.
Fig. 5 is a schematic top view of a pipe fitting involved in the method for manufacturing a metal bellows according to the present invention.
Fig. 6 is a schematic front view of a pipe fitting involved in the method for manufacturing a metal corrugated pipe according to the present invention.
Fig. 7 is a schematic perspective view of a finished metal bellows manufactured according to the present invention.
The reference numerals in the figures denote: 1. a plate material; 2. a pipe fitting; 21. welding; 3. a roller; 4. the mould is split; 41. laminating; 42. a positioning groove; 43. a positioning projection; 44. a connecting portion; 5. forming a frame body; 51. forming a groove; 6. a connecting flange; 61. a bending part.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples.
Fig. 1 to 6 show an embodiment of a method for manufacturing a metal corrugated pipe according to the present invention, in which a pipe 2 is placed in a closed and detachable forming frame 5, and the inner wall of the forming frame 5 is provided with a plurality of layers of forming grooves 51 for forming corrugations (the specific number of layers is determined according to the designed number of corrugations of the metal corrugated pipe); a roller 3 matched with the forming groove 51 is placed in the pipe fitting 2 and moves along the forming groove 51 to extrude the pipe fitting 2, and the pipe fitting 2 is extruded and formed into a corrugated pipe through the roller 3; the corrugated pipe is taken out by disassembling the molding frame body 5. Preferably, the forming frame 5 is fixed on a working platform of a hydraulic press, and correspondingly, the roller 3 is powered by the hydraulic press. In this embodiment, the cross section of pipe fitting 2 is the rectangle, and corresponding shaping framework 5 is the rectangle framework, can process the metal bellows of rectangle, can be used for between tunnel sterilization drying-machine box and the box. Of course, in other embodiments, if the corrugated tube with a square or circular cross section needs to be processed, the cross section of the tube 2 may also be square or circular, and correspondingly, the forming frame 5 is a square frame or a circular frame.
According to the manufacturing method of the metal corrugated pipe, the pipe 2 is placed in the forming frame body 5 with the forming groove 51, the forming frame body 5 is used for providing restraint for the pipe 2, then the roller 3 moves along the forming groove 51 and extrudes the pipe 2, so that a whole-circle corrugated structure can be obtained on the pipe 2, the corrugated pipe can be taken out after the forming frame body 5 is disassembled, and compared with the existing manufacturing method that four sides are formed independently and then welded and fixed, the manufacturing method of the metal corrugated pipe can obtain a whole-circle complete corrugated structure through one-step rolling forming, is simpler in steps and higher in processing efficiency, is beneficial to reducing the number of welding seams, and further can reduce the problems of welding stress concentration and welding seam cracking.
Further, in this embodiment, a strip-shaped plate 1 is bent to make two ends butt-joint and welded to form the tube 2. The strip-shaped plate 1 is bent to enable two ends to be butted and welded and fixed, closed pipe fittings 2 with various cross section shapes can be obtained, flexibility is good, application range is wide, only one welding line is generated, and the problems of welding stress concentration and welding line cracking are favorably reduced.
As a preferred embodiment, the two ends of the plate material 1 are laser welded. And laser welding is adopted, so that the welding strength is favorably ensured, the connection reliability of the two ends of the plate 1 is ensured, and welding cracking is prevented.
As preferred embodiment, the roll wheel 3 is according to the orbit of setting for and every ring displacement volume from up roll-in shaping in proper order down, pipe fitting 2 is placed in the forming frame body 5, pipe fitting 2 bottom and forming frame body 5 bottom are in the coplanar by the restriction of processing platform, therefore the top of pipe fitting 2 can surpass the upper surface of forming frame body 5, when up action is followed to the roll wheel 3, the top of pipe fitting 2 can reduce the height gradually, from last down action or from the middle action, it is not enough to lead to pipe fitting 2 top can not reduce or reduce the volume, final fashioned bellows has one end and does not process.
Furthermore, in this embodiment, the two end faces of the corrugated pipe are cut to be flat after the corrugated pipe is taken out, so that the problem that the two end faces of the corrugated pipe are not flat after the corrugated structure is formed on the plate 1 can be solved, and the final processing quality of the metal corrugated pipe can be ensured.
Preferably, as shown in fig. 7, the connection flanges 6 may be welded at both ends of the corrugated pipe, so as to facilitate the flange connection between the metal corrugated pipe and the connected object (such as the above-mentioned box), and furthermore, the bending portions 61 bending toward the middle of the metal corrugated pipe may be disposed at the periphery of the connection flanges 6, which is helpful to improve the mechanical strength of the connection flanges 6.
Further, in this embodiment, the molding frame 5 includes two sets of mold split bodies 4, and the mold split bodies 4 are detachably connected to each other with a positioning structure therebetween. When the corrugated pipe needs to be taken out, the connection between the two groups of the mold split bodies 4 is firstly disconnected, the structure is simple, and the use is convenient; the positioning structure is helpful for ensuring accurate positioning between the two groups of mold split bodies 4, and further ensuring the size and shape precision of the connected molding frame body 5. In other embodiments, the number of the mold split bodies 4 can be further increased, and the mold split bodies can be detachably connected in pairs.
Further, in the present embodiment, the mold division body 4 includes a plurality of stacked layers 41, and each of the stacked layers 41 is provided with a molding groove 51. By increasing or decreasing the number of the laminated layers 41, the height of the corrugated pipe or the axial length of the corrugated pipe can be adjusted, and the corrugated pipe is more flexible and convenient to use.
In a preferred embodiment, the positioning structure includes a positioning groove 42 provided on the stacked layer 41 of one of the mold split bodies 4 and a positioning protrusion 43 provided on the stacked layer 41 of the other mold split body 4, and the positioning protrusions 43 are provided in the positioning grooves 42 in a one-to-one correspondence. The positioning structure is simple and reliable, and can effectively prevent the dislocation between the laminated layers 41 when being extruded by the roller 3.
Further, in the present embodiment, the two ends of the stack 41 are provided with connecting portions 44 (e.g., through slots, connecting rings, threaded holes, etc.), and the connecting portions 44 are provided with fasteners (not shown in the drawings, such as bolts, screws, etc.) therethrough. The lamination layers 41 in the two groups of die split bodies 4 can be effectively connected into a whole through the fastening pieces and the connecting parts 44, and can be prevented from being separated when being extruded by the roller 3, so that the structure is simple and reliable.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (10)
1. A method for manufacturing a metal corrugated pipe is characterized by comprising the following steps: placing a pipe fitting (2) in a closed and detachable forming frame body (5), wherein the inner wall of the forming frame body (5) is provided with a plurality of layers of forming grooves (51) for forming corrugations; a roller (3) matched with the forming groove (51) is placed in the pipe fitting (2) and moves along the forming groove (51) to extrude the pipe fitting (2), and the pipe fitting (2) is extruded and formed into a corrugated pipe through the roller (3); and disassembling the molding frame body (5) and taking out the corrugated pipe.
2. A method of manufacturing a metal bellows according to claim 1, characterized in that: and bending a strip-shaped plate (1) to enable two ends to be in butt joint and welded and fixed to form the pipe fitting (2).
3. A method of manufacturing a metal bellows according to claim 2, wherein: and two ends of the plate (1) are welded by laser.
4. A method of manufacturing a metal bellows according to claim 1, wherein: and the roller (3) is sequentially rolled and formed from bottom to top according to a set track and each circle of displacement.
5. A method of manufacturing a metal bellows according to claim 1, characterized in that: and after the corrugated pipe is taken out, the two end faces of the corrugated pipe are cut to be smooth.
6. A method of manufacturing a metal bellows according to any one of claims 1 to 5, characterized in that: the molding frame body (5) comprises more than two groups of mold split bodies (4), and a positioning structure is arranged between the mold split bodies (4) and detachably connected.
7. A method of manufacturing a metal bellows according to claim 6, characterized in that: the mold split body (4) comprises a plurality of laminated layers (41), and each laminated layer (41) is provided with the forming groove (51).
8. A method of manufacturing a metal bellows according to claim 6, characterized in that: the positioning structure comprises positioning grooves (42) arranged on the lamination layers (41) of one group of the mold split bodies (4) and positioning convex parts (43) arranged on the lamination layers (41) of the other group of the mold split bodies (4), and the positioning convex parts (43) are correspondingly arranged in the positioning grooves (42) one by one.
9. A method of manufacturing a metal bellows according to claim 7, characterized in that: connecting parts (44) are arranged at two ends of the lamination (41), and fasteners penetrate through the connecting parts (44).
10. A method of manufacturing a metal bellows according to any one of claims 1 to 5, characterized in that: the cross section of the pipe fitting (2) is rectangular, square or circular, and the forming frame body (5) is a rectangular frame body, a square frame body or a circular frame body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210375813.3A CN114633078B (en) | 2022-04-11 | 2022-04-11 | Method for manufacturing metal corrugated pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210375813.3A CN114633078B (en) | 2022-04-11 | 2022-04-11 | Method for manufacturing metal corrugated pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114633078A true CN114633078A (en) | 2022-06-17 |
| CN114633078B CN114633078B (en) | 2023-05-16 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210375813.3A Active CN114633078B (en) | 2022-04-11 | 2022-04-11 | Method for manufacturing metal corrugated pipe |
Country Status (1)
| Country | Link |
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| CN (1) | CN114633078B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1586758A (en) * | 2004-08-31 | 2005-03-02 | 中国船舶重工集团公司第七二五研究所 | Method for producing integrally formed disc shape corrugated pipe |
| US20080155806A1 (en) * | 2006-12-21 | 2008-07-03 | Yutaka Giken Co., Ltd. | Method of, and apparatus for, manufacturing metallic bellows |
| US20080314189A1 (en) * | 2006-02-07 | 2008-12-25 | Christian Lutz | Deformable element, of a steering wheel spindle in the form of a corrugated tube |
| CN107013766A (en) * | 2017-05-25 | 2017-08-04 | 江苏省埃迪机电设备实业有限公司 | A kind of waveform is corrugated metal bellows |
| CN206875025U (en) * | 2017-07-10 | 2018-01-12 | 安岩晨 | A kind of 3 waveform bellows and the mould for being processed into compensator |
| CN111672928A (en) * | 2020-06-11 | 2020-09-18 | 西安石油大学 | Novel method for compositely forming metal corrugated pipe with special-shaped contour |
| CN112355108A (en) * | 2020-10-23 | 2021-02-12 | 南京德邦金属装备工程股份有限公司 | Forming method of large-diameter corrugated pipe expansion joint |
-
2022
- 2022-04-11 CN CN202210375813.3A patent/CN114633078B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1586758A (en) * | 2004-08-31 | 2005-03-02 | 中国船舶重工集团公司第七二五研究所 | Method for producing integrally formed disc shape corrugated pipe |
| US20080314189A1 (en) * | 2006-02-07 | 2008-12-25 | Christian Lutz | Deformable element, of a steering wheel spindle in the form of a corrugated tube |
| US20080155806A1 (en) * | 2006-12-21 | 2008-07-03 | Yutaka Giken Co., Ltd. | Method of, and apparatus for, manufacturing metallic bellows |
| CN107013766A (en) * | 2017-05-25 | 2017-08-04 | 江苏省埃迪机电设备实业有限公司 | A kind of waveform is corrugated metal bellows |
| CN206875025U (en) * | 2017-07-10 | 2018-01-12 | 安岩晨 | A kind of 3 waveform bellows and the mould for being processed into compensator |
| CN111672928A (en) * | 2020-06-11 | 2020-09-18 | 西安石油大学 | Novel method for compositely forming metal corrugated pipe with special-shaped contour |
| CN112355108A (en) * | 2020-10-23 | 2021-02-12 | 南京德邦金属装备工程股份有限公司 | Forming method of large-diameter corrugated pipe expansion joint |
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| Publication number | Publication date |
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| CN114633078B (en) | 2023-05-16 |
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Application publication date: 20220617 Assignee: Changsha Pharmaceutical Equipment Industrial Technology Research Institute Co.,Ltd. Assignor: TRUKING TECHNOLOGY Ltd. Contract record no.: X2023980051833 Denomination of invention: A manufacturing method for metal corrugated pipes Granted publication date: 20230516 License type: Common License Record date: 20231213 |