CN112792201A - Multi-size pipe fitting electromagnetic bulging device and method based on combined coil - Google Patents
Multi-size pipe fitting electromagnetic bulging device and method based on combined coil Download PDFInfo
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- CN112792201A CN112792201A CN202011466657.9A CN202011466657A CN112792201A CN 112792201 A CN112792201 A CN 112792201A CN 202011466657 A CN202011466657 A CN 202011466657A CN 112792201 A CN112792201 A CN 112792201A
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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
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces
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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
- B21D39/08—Tube expanders
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Abstract
A multi-size pipe fitting electromagnetic bulging device and method based on a combined coil comprise a coil framework, the combined coil, a pulse power supply and a control system, wherein a metal pipe fitting is sleeved between round tables of an upper cover plate and a lower cover plate, the combined coil is wound on the coil framework located on the outer radial direction of the metal pipe fitting, the combined coil is connected with the pulse power supply, the pulse power supply is connected with the control system, the control system controls the pulse power supply to discharge through a time sequence circuit, a continuously changing pulse magnetic field is generated around the combined coil, further eddy current resisting the change of the pulse magnetic field is induced in the metal pipe fitting, the pulse magnetic field and the eddy current interact to generate electromagnetic force to drive the metal pipe fitting to deform, and the diameter of the metal pipe fitting is. The invention overcomes the problems that the electromagnetic bulging of the traditional pipe fitting needs to adopt a die, cannot adapt to the forming of the pipe fitting with small inner diameter and large bulging amount and has high cost, the bulging of the pipe fittings with different specifications is realized without the die, and the invention has the characteristics of good forming effect, low cost, high efficiency and simple and convenient operation.
Description
Technical Field
The invention belongs to the technical field of pipe fitting bulging, and relates to a multi-size pipe fitting electromagnetic bulging device and method based on a combined coil.
Background
According to the traditional metal pipe electromagnetic bulging technology, a forming coil is mostly arranged in a pipe, the pipe is driven to deform through repulsive force, but the small coil is difficult to wind and difficult to place in the pipe, and the method is not suitable for forming the small pipe. In the existing electromagnetic bulging process of the tiny pipe fitting, a coil is arranged outside the pipe fitting, and the pipe fitting is driven to be formed through attraction type electromagnetic force. Although the electromagnetic bulging of the tiny pipe is effectively achieved, the following disadvantages also exist:
in the process of electromagnetic bulging, the electromagnetic force on the pipe fitting is not uniformly distributed, the radial electromagnetic force borne by two ends of the pipe fitting is small, and the radial electromagnetic force borne by the middle part of the pipe fitting is large, so that the forming effect is poor. Because the forming space of the pipe fitting changes along with the change of the coil size, when the coil size is smaller, the forming space reserved on the side wall of the coil is smaller, and the pipe fitting forming with large bulging capacity cannot be realized. The effective utilization rate of a formed coil in the existing electromagnetic bulging technology is low, and coils with different sizes need to be replaced according to different pipe fitting models.
The attractive forming device for metal pipe member described in the patent publication No. CN 206763690U includes forming coil, metal pipe member, mold, magnetic collector, etc. The device arranges the pipe fitting in the coil, adopts the dual-frequency formula discharge current wave form, when the current wave form was in the falling edge, induced the electric current with the same direction of coil in the pipe fitting, produced the electromagnetic force of attraction formula, and then drive metal pipe fitting and take place the bulging. The disadvantages of the above method are: because the electromagnetic force on the pipe fitting is distributed unevenly, the forming effect is poor; when the coil size is small, the pipe fitting forming with large bulging capacity cannot be realized; the forming device requires the cooperation of a die and the strict matching of the coil size and the pipe fitting, which increases the processing difficulty and the manufacturing cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multi-size pipe fitting electromagnetic bulging device and method based on a combined coil, wherein the device is simple in structure, a metal pipe fitting is sleeved between round tables of an upper cover plate and a lower cover plate, the combined coil is wound on a coil framework positioned on the outer radial direction of the metal pipe fitting, the combined coil is connected with a pulse power supply, the pulse power supply is connected with a control system, the control system controls the pulse power supply to discharge by adopting a time sequence circuit, a constantly changing pulse magnetic field is generated around the combined coil, further eddy current resisting the change of the pulse magnetic field is induced in the metal pipe fitting, the pulse magnetic field and the eddy current interact to generate electromagnetic force to drive the metal pipe fitting to deform, so that the diameter of the metal pipe fitting is enlarged and the metal pipe fitting is bulged outwards, a mould is not needed to realize bulging of.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a multi-size pipe fitting electromagnetic bulging device based on a combined coil comprises a coil framework, an upper cover plate, a lower cover plate, the combined coil, a pulse power supply and a control system; the combined coil is wound on the coil framework and is positioned between the upper cover plate and the lower cover plate;
the combined coil is connected with a pulse power supply, and the pulse power supply is connected with a control system;
the combined coil comprises a first drive coil, a second drive coil and a third drive coil;
the first driving coil, the second driving coil and the third driving coil are positioned on the same axis;
the inner diameters of the first driving coil, the second driving coil and the third driving coil are reduced in sequence;
the combined coil further comprises a fourth driving coil, and the inner diameter of the fourth driving coil is of a concave arc-shaped structure and is located in the middle of the combined coil.
The number of the pulse power supplies is multiple, and the pulse power supplies can be flexibly adjusted according to control requirements.
The control system adopts a sequential circuit to control the pulse power supply.
The combined coil is formed by combining any three driving coils, and the combination form can be selected according to the size of the pipe fitting.
The bulging method of the multi-size pipe fitting electromagnetic bulging device based on the combined coil comprises the following steps:
s1, fixing one end of the annealed metal pipe fitting on an upper round table of the lower cover plate and placing the annealed metal pipe fitting on a workbench of a hydraulic machine;
s2, winding seven driving coils by using a winding machine, wherein the seven driving coils comprise two first driving coils, two second driving coils, two third driving coils and a fourth driving coil;
s3, selecting a corresponding driving coil combination according to the size of the pipe fitting, winding the driving coil combination on a coil framework, and placing the coil framework wound with the combined coil on a lower cover plate;
s4, embedding the upper cover plate at the upper end of the coil framework, and pressing the upper cover plate by using hydraulic equipment; the pressure of the coil framework is not separated from the metal pipe fitting, and the metal pipe fitting is not deformed;
s5, the operation control system controls the combined coil to discharge according to the time sequence circuit, a pulse magnetic field which changes constantly is generated around the coil, eddy current which resists the change of the pulse magnetic field is induced in the metal pipe fitting, the pulse magnetic field and the eddy current interact to generate electromagnetic force to drive the metal pipe fitting to deform, and the diameter of the metal pipe fitting is enlarged and the metal pipe fitting expands outwards.
A multi-size pipe fitting electromagnetic bulging device and method based on a combined coil comprise a coil framework, cover plates, a combined coil, a pulse power supply and a control system, wherein a metal pipe fitting is sleeved between round tables of an upper cover plate and a lower cover plate, the combined coil is wound on the coil framework positioned on the outer radial direction of the metal pipe fitting, the combined coil is connected with the pulse power supply, the pulse power supply is connected with the control system, the control system adopts a time sequence circuit to control the pulse power supply to discharge, a continuously changing pulse magnetic field is generated around the combined coil, eddy current resisting the change of the pulse magnetic field is induced in the metal pipe fitting, the pulse magnetic field and the eddy current interact to generate electromagnetic force to drive the metal pipe fitting to deform, so that the diameter of the metal. The invention overcomes the problems that the electromagnetic bulging of the original traditional pipe fitting needs to adopt a die, cannot adapt to the forming of the pipe fitting with small inner diameter and large bulging amount, has complex forming and high cost, does not need the die to realize the bulging of the pipe fittings with different specifications, and has the characteristics of good forming effect, low cost, high efficiency and simple and convenient operation.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a waveform diagram of the discharge current of the combined coil according to the present invention.
Fig. 3 is a use state diagram of the invention.
Fig. 4 is another usage state diagram of the invention.
Fig. 5 is another usage state diagram of the invention.
Fig. 6 is another usage state diagram of the invention.
In the figure: the coil comprises a coil framework 1, an upper cover plate 11, a lower cover plate 12, a combined coil 2, a first driving coil 21, a second driving coil 22, a third driving coil 23 and a fourth driving coil 24.
Detailed Description
As shown in fig. 1 to 6, a multi-size pipe electromagnetic bulging device based on a combined coil comprises a coil framework 1, a combined coil 2, an upper cover plate 11, a lower cover plate 12, a pulse power supply and a control system; the combined coil 2 is wound on the coil framework and is positioned between the upper cover plate and the lower cover plate;
the combined coil 2 is connected with a pulse power supply, and the pulse power supply is connected with a control system;
the combined coil 2 comprises a first driving coil 21, a second driving coil 22 and a third driving coil 23;
the first driving coil 21, the second driving coil 22 and the third driving coil 23 are positioned on the same axis;
the inner diameters of the first driving coil 21, the second driving coil 22 and the third driving coil 23 are reduced in sequence;
the structure is special, establish metal pipe fitting through the cover between the round platform of upper and lower apron 12, be located winding combination coil 2 on the outside radial coil skeleton 1 of metal pipe fitting, combination coil 2 is connected with pulse power supply, pulse power supply is connected with control system, adopt sequential circuit control pulse power supply to discharge through control system, produce the impulse magnetic field of constantly changing around combination coil 2, the vortex that resists the impulse magnetic field change is resisted in the metal pipe fitting induction, impulse magnetic field and vortex interact produce electromagnetic force drive metal pipe fitting and warp, make the outside inflation of metal pipe fitting diameter grow, need not the bulging of mould realization different specification pipe fittings, good forming effect, and is with low costs, high efficiency, characteristics that easy operation is convenient.
Preferably, the control system is a PLC control system.
Preferably, the upper cover plate 11 and the lower cover plate 12 are respectively provided with two circular truncated cones, wherein the outer diameter of the smaller circular truncated cone is just the inner diameter of the pipe to be formed, and the outer diameter of the larger circular truncated cone is just the inner diameter of the formed coil.
In a preferred embodiment, the combined coil 2 further includes a fourth driving coil 24, and an inner diameter of the fourth driving coil 24 is a concave arc-shaped structure and is located in a middle portion of the combined coil 2. The fourth drive coil 24 allows the expanded diameter of the tubular to be larger than the other drive coils.
In a preferred embodiment, the number of the pulse power sources is plural. When the pulse power supply is used, the driving coils are connected in series or in parallel according to control requirements, and the number of the pulse power supplies can be correspondingly selected.
In a preferred scheme, the control system adopts a sequential circuit to control the pulse power supply. Simple structure, during the use, pulse power supply passes through control system sequential circuit control for can produce constantly changing pulsed magnetic field around combination coil 2, the vortex that resists the pulsed magnetic field change is responded to in the metal pipe fitting, and pulsed magnetic field and vortex interact produce the electromagnetic force drive metal pipe fitting and warp, and the electromagnetic force that distributes on metal pipe fitting surface is balanced.
In a preferred embodiment, when the combined coil 2 has a first driving coil 21 at the middle and two second driving coils 22 at the two ends, it is suitable for producing a metal pipe with a smaller inner diameter.
In a preferred scheme, when the middle part of the combined coil 2 is provided with the second driving coil 22, and two third driving coils 23 are arranged at two ends of the combined coil, the combined coil is suitable for producing metal pipes with moderate inner diameters.
In a preferred embodiment, when the combined coil 2 has a first driving coil 21 at the middle and two third driving coils 23 at the two ends, it is suitable for producing metal pipes with larger inner diameters.
In a preferred embodiment, when the middle of the combined coil 2 is a fourth driving coil 24 and the two ends are two second driving coils 22, the combined coil is suitable for producing a metal pipe with a larger inner diameter in the middle after bulging.
In a preferred embodiment, the bulging method of the multi-size pipe electromagnetic bulging device based on combined coils, as described above, includes the following steps:
s1, fixing one end of the annealed metal pipe fitting on an upper round table of the lower cover plate and placing the annealed metal pipe fitting on a workbench of a hydraulic machine;
s2, winding seven driving coils by using a winding machine, wherein the seven driving coils comprise two first driving coils, two second driving coils, two third driving coils and a fourth driving coil;
s3, selecting a corresponding driving coil combination according to the size of the pipe fitting, winding the driving coil combination on a coil framework, and placing the coil framework wound with the combined coil on a lower cover plate;
s4, embedding the upper cover plate at the upper end of the coil framework, and pressing the upper cover plate by using hydraulic equipment; the pressure of the coil framework is not separated from the metal pipe fitting, and the metal pipe fitting is not deformed;
s5, the operation control system controls the combined coil to discharge according to the time sequence circuit, a pulse magnetic field which changes constantly is generated around the coil, eddy current which resists the change of the pulse magnetic field is induced in the metal pipe fitting, the pulse magnetic field and the eddy current interact to generate electromagnetic force to drive the metal pipe fitting to deform, and the diameter of the metal pipe fitting is enlarged and the metal pipe fitting expands outwards. The method is simple and convenient to operate, the driving coils with different specifications are replaced according to the sizes of different pipe fittings, the adaptability is good, the processing efficiency is high, and the cost is low.
Example (b):
taking a metal pipe fitting with the model number of A1060-O, the inner diameter of 20mm and the pipe wall thickness of 1mm after annealing pretreatment as an example, the forming operation is as follows:
one end of the annealed A1060-O pipe fitting is fixed on an upper round table of the lower cover plate 12 and is arranged on a workbench of a hydraulic machine;
two second driving coils 23 and a third driving coil 22 are combined to form a combined coil 2, the combined coil 2 is wound on a coil framework 1, and the coil framework wound with the combined coil 2 is placed on a lower cover plate 12;
embedding an upper cover plate at the upper end of the coil framework, and pressing the upper cover plate by using hydraulic equipment; the pressure of the coil framework 1 does not deviate from the A1060-O pipe fitting and simultaneously does not deform the A1060-O pipe fitting;
the operation control system controls the combined coil 2 to discharge according to a time sequence circuit, a continuously changing pulse magnetic field is generated around the combined coil 2, eddy current resisting the change of the pulse magnetic field is induced in the A1060-O pipe fitting, the pulse magnetic field and the eddy current interact to generate electromagnetic force to drive the A1060-O pipe fitting to deform, so that the diameter of the A1060-O pipe fitting is enlarged and the A1060-O pipe fitting is expanded and formed outwards;
when the inner diameter of the pipe is reduced to 10mm, two second driving coils 22 and one first driving coil 21 can be combined; when the inner diameter of the pipe is increased to 20mm, two third driving coils 23 and one first driving coil 21 may be used in combination.
In order to make the inner diameter of the middle part of the expanded pipe larger, the pipe can adopt a fourth driving coil 24 and two second driving coils 22 to combine into a combined coil 2; after forming, the A1060-O tube expanded a greater amount in the middle than before.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (6)
1. The utility model provides a many sizes pipe fitting electromagnetism bulging device based on combination coil which characterized by: the coil comprises a coil framework (1), a combined coil (2), a pulse power supply and a control system; the combined coil (2) is wound on the coil framework (1) and is positioned between the upper cover plate (11) and the lower cover plate (12);
the combined coil (2) is connected with a pulse power supply, and the pulse power supply is connected with a control system;
the combined coil (2) comprises a first driving coil (21), a second driving coil (22) and a third driving coil (23);
the first driving coil (21), the second driving coil (22) and the third driving coil (23) are positioned on the same axis;
the inner diameters of the first driving coil (21), the second driving coil (22) and the third driving coil (23) are reduced in sequence;
the upper cover plate (11) and the lower cover plate (12) are used for fixing the pipe fittings, two circular truncated cones are respectively arranged on the two cover plates, wherein the outer diameter of the smaller circular truncated cone is just the inner diameter of the pipe fitting to be formed, and the outer diameter of the larger circular truncated cone is just the inner diameter of the forming coil.
2. The multi-size pipe electromagnetic bulging apparatus based on combined coils of claim 1, wherein: the combined coil (2) further comprises a fourth driving coil (24), and the inner diameter of the fourth driving coil (24) is of a concave arc-shaped structure and is located in the middle of the combined coil (2).
3. The multi-size pipe electromagnetic bulging apparatus based on combined coils of claim 1, wherein: the number of the pulse power supplies is multiple, and the pulse power supplies can be flexibly adjusted according to control requirements.
4. The multi-size pipe electromagnetic bulging apparatus based on combined coils of claim 1, wherein: the control system adopts a sequential circuit to control the pulse power supply.
5. The multi-size pipe electromagnetic bulging apparatus based on combined coils of claim 1, wherein: the combined coil (2) is formed by combining any three driving coils, and the combination form can be selected according to the size of the pipe fitting.
6. The method for bulging the multi-sized pipe fitting electromagnetic bulging device based on combined coils as claimed in any one of claims 1 to 5, wherein the method comprises the steps of:
s1, one end of the annealed metal pipe fitting is fixed on an upper round table of a lower cover plate (12) and is arranged on a workbench of a hydraulic machine;
s2, winding seven driving coils by using a winding machine, wherein the seven driving coils comprise two first driving coils (21), two second driving coils (22), two third driving coils (23) and a fourth driving coil (24);
s3, selecting a corresponding driving coil combination according to the size of the pipe fitting, winding the driving coil combination on a coil framework (1), and placing the coil framework wound with a combined coil (2) on a lower cover plate (12);
s4, embedding the upper cover plate (11) at the upper end of the coil framework, and pressing the upper cover plate by using hydraulic equipment; the pressure of the coil framework (1) does not fall off the metal pipe, and the metal pipe is not deformed;
s5, the operation control system controls the combined coil (2) to discharge according to the time sequence circuit, a continuously changing pulse magnetic field is generated around the coil, eddy current resisting the change of the pulse magnetic field is induced in the metal pipe fitting, the pulse magnetic field and the eddy current interact to generate electromagnetic force to drive the metal pipe fitting to deform, and the diameter of the metal pipe fitting is enlarged and the metal pipe fitting expands outwards.
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| CN202011466657.9A CN112792201B (en) | 2020-12-14 | 2020-12-14 | Multi-size pipe fitting electromagnetic bulging device and method based on combined coil |
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| CN202011466657.9A CN112792201B (en) | 2020-12-14 | 2020-12-14 | Multi-size pipe fitting electromagnetic bulging device and method based on combined coil |
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| CN112792201B CN112792201B (en) | 2022-07-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5542140A (en) * | 1978-09-18 | 1980-03-25 | Inoue Japax Res Inc | Coil for electromagnetic forming |
| JP2011121083A (en) * | 2009-12-09 | 2011-06-23 | Kobe Steel Ltd | Inductor for electromagnetically expanding and forming tube, and method for manufacturing the same |
| CN106694681A (en) * | 2017-03-06 | 2017-05-24 | 华中科技大学 | Electromagnetic forming device and method of metal pipe |
| CN206925192U (en) * | 2017-03-06 | 2018-01-26 | 华中科技大学 | A kind of electromagnetic forming device of metal tube |
| CN109622721A (en) * | 2018-12-14 | 2019-04-16 | 华中科技大学 | A kind of the electro-magnetic forming power regulation device and method of metal tube |
| CN109967593A (en) * | 2019-03-18 | 2019-07-05 | 三峡大学 | A kind of device and method for realizing that pipe fitting Electromagnetic bulging is compressed axially using radially constant magnetic field and inductive loop |
| CN111515291A (en) * | 2020-04-30 | 2020-08-11 | 华中科技大学 | Electromagnetic forming device and method for metal pipe fitting |
-
2020
- 2020-12-14 CN CN202011466657.9A patent/CN112792201B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5542140A (en) * | 1978-09-18 | 1980-03-25 | Inoue Japax Res Inc | Coil for electromagnetic forming |
| JP2011121083A (en) * | 2009-12-09 | 2011-06-23 | Kobe Steel Ltd | Inductor for electromagnetically expanding and forming tube, and method for manufacturing the same |
| CN106694681A (en) * | 2017-03-06 | 2017-05-24 | 华中科技大学 | Electromagnetic forming device and method of metal pipe |
| CN206925192U (en) * | 2017-03-06 | 2018-01-26 | 华中科技大学 | A kind of electromagnetic forming device of metal tube |
| CN109622721A (en) * | 2018-12-14 | 2019-04-16 | 华中科技大学 | A kind of the electro-magnetic forming power regulation device and method of metal tube |
| CN109967593A (en) * | 2019-03-18 | 2019-07-05 | 三峡大学 | A kind of device and method for realizing that pipe fitting Electromagnetic bulging is compressed axially using radially constant magnetic field and inductive loop |
| CN111515291A (en) * | 2020-04-30 | 2020-08-11 | 华中科技大学 | Electromagnetic forming device and method for metal pipe fitting |
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