CN110538931B - Method for realizing circular ring connection by wrinkling metal pipe - Google Patents
Method for realizing circular ring connection by wrinkling metal pipe Download PDFInfo
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- CN110538931B CN110538931B CN201910927664.5A CN201910927664A CN110538931B CN 110538931 B CN110538931 B CN 110538931B CN 201910927664 A CN201910927664 A CN 201910927664A CN 110538931 B CN110538931 B CN 110538931B
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- ring
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- connecting pipe
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- wrinkles
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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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
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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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The invention discloses a method for realizing circular ring connection by utilizing wrinkling of a metal pipe, and belongs to the technical field of material connection. The connecting pipe is enabled to wrinkle in the non-constrained area by utilizing the phenomenon that the connecting pipe generates plastic instability under the stress action of the end part, and the wrinkles are further compacted, so that the plastic connection between the two metal rings is realized. After the connecting pipe is subjected to plastic deformation, the strength of the connecting part can be improved due to deformation reinforcement, so that the connection is safe and reliable; the preposed preparation procedures are few, the operation is simple and convenient, the whole connection process is green and pollution-free, and the operation is simple, convenient and efficient.
Description
Technical Field
The invention belongs to the technical field of material connection, and particularly relates to a method for realizing circular ring connection by utilizing wrinkling of a metal pipe.
Background
In the fields of machine manufacturing, container manufacturing, building engineering and the like, two metal circular rings are generally connected together, and the traditional method mainly comprises three modes of bolting, welding and riveting. However, there are problems to be optimized in all three connection modes: 1) the metal ring is drilled with holes for bolt connection, the holes need to be uniformly distributed on the ring in advance, the bolt connection mode has a plurality of protruding parts on the surface of the ring, the subsequent use or assembly is influenced in certain occasions, and meanwhile, bolts and nuts are likely to loosen and fall off under the vibration use environment, so that the possibility of connection failure is caused. 2) The method of welding the inner part or the edge of the circular ring is easy to generate harmful gas and cause environmental pollution. In addition, improper welding operation easily causes defects such as welding cracks, inclusions, pores and poor appearance of welding seams, and the like, and influences the service life of workpieces. 3) The method of riveting by using the rivet also needs to drill a plurality of holes on the metal circular ring, the process is complicated, and the problem that the head of the rivet is raised to influence the attractive surface of the circular ring exists. Therefore, there is a need for a new method for efficiently and stably connecting metal rings.
Disclosure of Invention
In order to solve the problems, the invention provides a method for realizing ring connection by utilizing wrinkling of a metal pipe, which is simple to operate, wide in application range, capable of realizing firm connection of ring pieces, capable of effectively reducing cost and improving production efficiency and free of pollution.
The invention is realized by the following technical scheme:
the invention discloses a method for realizing ring connection by wrinkling a metal pipe, which comprises the following steps:
for an upper ring and a lower ring to be connected, a connecting pipe made of metal is sleeved on the outer wall of the mandrel, the upper ring and the lower ring are sleeved on the outer wall of the connecting pipe, the connecting pipe is placed in the middle of holes of the upper ring and the lower ring, and the upper ring and the lower ring are kept horizontally fixed; sleeving an upper die and a lower die on the outer wall of a mandrel, wherein the upper die and the lower die are both stepped circular rings with primary step surfaces, the step surface of the upper die, which is close to the mandrel side, is in contact with the upper end surface of a connecting pipe, and the step surface of the lower die, which is close to the mandrel side, is in contact with the lower end surface of the connecting pipe; the outer wall surface of the connecting pipe is respectively contacted with the upper die, the lower die, the upper ring and the lower ring;
applying a downward force F to the upper die and an upward force F to the lower die, wherein under the action of the axial pressure F, the non-constrained region between the upper die and the upper ring on the connecting pipe and the non-constrained region between the lower die and the lower ring on the connecting pipe are subjected to plastic instability and are bent and wrinkled to generate wrinkles;
the upper die and the lower die continue to apply pressure to the connecting pipe, and the wrinkles are pressed and folded until the wrinkles between the upper die and the upper ring cling to the lower surface of the upper die and the upper surface of the upper ring, and the wrinkles between the lower die and the lower ring cling to the upper surface of the lower die and the lower surface of the lower ring;
stopping applying force to the upper die and the lower die, and removing the upper die, the lower die and the mandrel; and removing the redundant part of the wrinkles to complete the connection of the metal rings.
Preferably, the unconstrained region of the connecting tube is electromagnetically inductively heated prior to application of the force F.
Preferably, after the removal of the excess portion of the wrinkle, the fracture is pressed into close contact with the wrinkle and smoothed.
Preferably, the inner holes of the upper ring and the lower ring are provided with transition fillets.
Further preferably, the radius of the transition fillet of the upper ring is 1/3-1/2 of the thickness of the upper ring, and the radius of the transition fillet of the lower ring is 1/3-1/2 of the thickness of the lower ring.
Preferably, inner edges of the holes of the upper and lower dies have rounded corners.
Further preferably, the radius of the fillet is 2-4 times of the wall thickness of the connecting pipe.
Preferably, the material of the connecting pipe is the same as the material with higher tensile strength in the upper ring and the lower ring.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a method for realizing ring connection by wrinkling metal pipes, which utilizes the phenomenon of plastic instability of a connecting pipe under the action of stress on the end part to wrinkle the connecting pipe in a non-constrained area and further compact wrinkles to realize plastic connection between two metal rings. After the connecting pipe is subjected to plastic deformation, the strength of the connecting part can be improved due to deformation reinforcement, so that the connection is safe and reliable; the preposed preparation procedures are few, the operation is simple and convenient, the whole connection process is green and pollution-free, and the operation is simple, convenient and efficient.
Furthermore, before the force F is applied, the non-constrained area on the connecting pipe is subjected to electromagnetic induction heating, so that the deformation resistance during connection can be reduced, the material flowing effect is improved, and the breakage is avoided. The electromagnetic induction heating is flexible in application position and high in efficiency.
Furthermore, after the redundant part of the wrinkle is removed, the fracture is pressed to be tightly attached to the wrinkle, the fracture is polished smoothly, the requirement of roughness in actual production can be met, and the appearance is smooth.
Furthermore, transition fillets are arranged at inner holes of the upper ring and the lower ring, fillets are arranged at inner edges of holes of the upper die and the lower die, and accordingly the situation that contact parts of connecting pipes are broken or seriously thinned due to sharp corners in the connecting process can be avoided.
Furthermore, the material of the connecting pipe is the same as the material of the upper ring and the material of the lower ring, so that the connecting parts can have better connecting strength, and meanwhile, the strength difference of the whole connecting piece is reduced.
Drawings
FIG. 1 is a front cross-sectional view of the overall construction after installation and prior to attachment in accordance with the attachment method of the present invention;
FIG. 2 is a front cross-sectional view of the overall structure after the connection of the connection pipe of the present invention is wrinkled in the middle of the connection;
FIG. 3 is a front sectional view of the overall structure of the joining method of the present invention when joining of the rings is completed;
FIG. 4 is a comparison of the structure before and after trimming the connecting member according to the connecting method of the present invention;
fig. 5 is a structural view of a connecting member finally obtained by the connecting method of the present invention.
In the figure: 1 is the dabber, 2 is the mould, 3 is last ring, 4 is lower ring, 5 is the connecting pipe, 6 is the lower mould.
Detailed Description
The present invention will now be described in further detail with reference to the following figures and specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention discloses a method for realizing ring connection by wrinkling metal pipes, which comprises the following steps:
for an upper ring 3 and a lower ring 4 to be connected, a connecting pipe 5 made of metal is sleeved on the outer wall of the mandrel 1, and the material of the connecting pipe 5 is the same as that of the upper ring 3 and the lower ring 4, wherein the tensile strength is higher; sleeving the upper ring 3 and the lower ring 4 on the outer wall of the connecting pipe 5, and placing the connecting pipe 5 in the middle of the holes of the upper ring 3 and the lower ring 4 to keep the upper ring 3 and the lower ring 4 horizontally fixed; transition fillets can be machined at inner holes of the upper circular ring 3 and the lower circular ring 4; the radius r of the transition fillet of the upper ring 3 is 1/3-1/2 of the thickness of the upper ring 3, and the radius r of the transition fillet of the lower ring 4 is 1/3-1/2 of the thickness of the lower ring 4.
Sleeving an upper die 2 and a lower die 6 on the outer wall of a mandrel 1, wherein the upper die 2 and the lower die 6 are both stepped circular rings with primary step surfaces, the step surface of the upper die 2 close to the side of the mandrel 1 is contacted with the upper end surface of a connecting pipe 5, and the step surface of the lower die 6 close to the side of the mandrel 1 is contacted with the lower end surface of the connecting pipe 5; the outer wall surface of the connecting pipe 5 is respectively contacted with the upper die 2, the lower die 6, the upper circular ring 3 and the lower circular ring 4; the inner edges of the holes of the upper die 2 and the lower die 6 can be processed into round corners, and the radius R of each round corner is 2-4 times of the wall thickness of the connecting pipe 5.
Before the force F is applied, the non-constrained area on the connecting pipe 5 can be subjected to electromagnetic induction heating, and particularly when the connecting pipe 5 is made of metal with poor plasticity, such as partial aluminum alloy and magnesium alloy, the deformation resistance during connection can be reduced, the material flowing effect is improved, and the occurrence of breakage is avoided. Downward force F is applied to the upper die 2, upward force F is applied to the lower die 6, and under the action of axial pressure F, the connecting pipe 5 is subjected to plastic instability in an unconstrained area between the upper die 2 and the upper ring 3 on the connecting pipe 5 and an unconstrained area between the lower die 6 and the lower ring 4 on the connecting pipe 5, so that the bending and wrinkling are generated.
The upper die 2 and the lower die 6 continue to press the connecting pipe 5, and wrinkles are pressed and folded until the wrinkles between the upper die 2 and the upper ring 3 cling to the lower surface of the upper die 2 and the upper surface of the upper ring 3, and the wrinkles between the lower die 6 and the lower ring 4 cling to the upper surface of the lower die 6 and the lower surface of the lower ring 4;
stopping applying force to the upper die 2 and the lower die 6, and removing the upper die 2, the lower die 6 and the mandrel 1; and removing the redundant part of the wrinkle, pressing the fracture to be tightly attached to the wrinkle, and polishing the fracture smoothly to complete the connection of the metal ring.
The power source can be realized by a press machine with an upper ejection function, a lower ejection function and a blank pressing function, an upper die 2 and a lower die 6 are respectively connected with the upper ejection structure and the lower ejection structure of the press machine, a lower ring 4 is placed on a workbench of the press machine, and a clamp or a jacking device is used for applying pressure to the mandrel 1, the upper ring 3 and the lower ring 4 so as to clamp and fix the mandrel 1, the upper ring 3 and the lower ring 4.
It should be noted that the present invention is not limited to the above-mentioned embodiments, and any obvious modifications or alterations to the above-mentioned embodiments can be made by those skilled in the art without departing from the spirit of the present invention and the scope of the appended claims.
Claims (6)
1. A method for realizing annular connection by wrinkling metal pipes, which is characterized by comprising the following steps:
for an upper ring (3) and a lower ring (4) to be connected, a connecting pipe (5) made of metal is sleeved on the outer wall of a mandrel (1), the upper ring (3) and the lower ring (4) are sleeved on the outer wall of the connecting pipe (5), the connecting pipe (5) is placed in the middle of holes of the upper ring (3) and the lower ring (4), transition fillets are arranged at inner holes of the upper ring (3) and the lower ring (4), and the upper ring (3) and the lower ring (4) are kept horizontally fixed; sleeving an upper die (2) and a lower die (6) on the outer wall of a mandrel (1), wherein the upper die (2) and the lower die (6) are both stepped circular rings with primary step surfaces, the step surface of the upper die (2) close to the side of the mandrel (1) is contacted with the upper end surface of a connecting pipe (5), and the step surface of the lower die (6) close to the side of the mandrel (1) is contacted with the lower end surface of the connecting pipe (5); the outer wall surface of the connecting pipe (5) is respectively contacted with the upper die (2), the lower die (6), the upper circular ring (3) and the lower circular ring (4);
applying a downward force F to the upper die (2), applying an upward force F to the lower die (6), and before applying the force F, performing electromagnetic induction heating on a non-constraint area on the connecting pipe (5), wherein under the action of axial pressure F, the non-constraint area between the upper die (2) and the upper circular ring (3) on the connecting pipe (5) and the non-constraint area between the lower die (6) and the lower circular ring (4) on the connecting pipe (5) are subjected to plastic instability and are bent and wrinkled to generate wrinkles;
the upper die (2) and the lower die (6) continue to apply pressure to the connecting pipe (5) to press and fold the wrinkles until the wrinkles between the upper die (2) and the upper ring (3) are tightly attached to the lower surface of the upper die (2) and the upper surface of the upper ring (3) and the wrinkles between the lower die (6) and the lower ring (4) are tightly attached to the upper surface of the lower die (6) and the lower surface of the lower ring (4);
stopping applying force to the upper die (2) and the lower die (6), and removing the upper die (2), the lower die (6) and the mandrel (1); and removing the redundant part of the wrinkles to complete the connection of the metal rings.
2. The method of claim 1, wherein the excess portion of the wrinkles is removed and the fracture is pressed into close contact with the wrinkles and smoothed.
3. The method for realizing the connection of the circular rings by utilizing the corrugation of the metal pipes as the claim 1 is characterized in that the radius of the transition fillet of the upper circular ring (3) is 1/3-1/2 of the thickness of the upper circular ring (3), and the radius of the transition fillet of the lower circular ring (4) is 1/3-1/2 of the thickness of the lower circular ring (4).
4. Method for realising a circular ring connection by means of corrugations in metal tubes, according to claim 1, characterised in that the internal edges of the holes of the upper (2) and lower (6) dies have rounded corners.
5. The method for realizing the annular connection by utilizing the corrugation of the metal pipe as claimed in claim 4, wherein the radius of the fillet is 2-4 times of the wall thickness of the connecting pipe (5).
6. Method for realising a ring joint by wrinkling metal tubes according to claim 1, characterised in that the material of the connecting tube (5) is the same as the material of the upper ring (3) and the lower ring (4) with higher tensile strength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910927664.5A CN110538931B (en) | 2019-09-27 | 2019-09-27 | Method for realizing circular ring connection by wrinkling metal pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910927664.5A CN110538931B (en) | 2019-09-27 | 2019-09-27 | Method for realizing circular ring connection by wrinkling metal pipe |
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| Publication Number | Publication Date |
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| CN110538931A CN110538931A (en) | 2019-12-06 |
| CN110538931B true CN110538931B (en) | 2021-02-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111054830B (en) * | 2020-01-02 | 2021-06-22 | 陕西科技大学 | Method and device for connecting pipe and plate by using plastic deformation of pipe |
| CN110976672B (en) * | 2020-01-02 | 2021-06-25 | 陕西科技大学 | Method and device for realizing connection of plate and pipe by utilizing plastic deformation of plate |
| CN113953391B (en) * | 2021-10-14 | 2023-11-03 | 陕西科技大学 | Plate-tube connection method and device based on local radial extrusion |
| DE102022103233A1 (en) | 2022-02-11 | 2023-08-17 | Bayerische Motoren Werke Aktiengesellschaft | Process for fastening elements to pipes or tubular workpieces, arrangement of components and device for carrying out the process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07223030A (en) * | 1994-02-16 | 1995-08-22 | Sango Co Ltd | Joining method of pipe and plate stock |
| JP2000263156A (en) * | 1999-03-15 | 2000-09-26 | Toyo Hatome Kogyo Kk | Eyelet |
| JP2002361339A (en) * | 2001-06-07 | 2002-12-17 | Matsushita Electric Ind Co Ltd | Eyelet member-mounting tool and mounting method for eyelet terminal |
| JP3952991B2 (en) * | 2002-07-22 | 2007-08-01 | 株式会社デンソー | Manufacturing method of piping having joint portions at both ends |
| JP4921019B2 (en) * | 2006-04-06 | 2012-04-18 | 昭和電工株式会社 | Joining method between members |
| US9303671B2 (en) * | 2013-01-15 | 2016-04-05 | GM Global Technology Operations LLC | Method of isolating metallic fasteners in composite panels |
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