CN207577198U - A kind of non-contact flaring of pipe fitting that need not be placed in inside pipe fitting or hemmer - Google Patents
A kind of non-contact flaring of pipe fitting that need not be placed in inside pipe fitting or hemmer Download PDFInfo
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- CN207577198U CN207577198U CN201721479985.6U CN201721479985U CN207577198U CN 207577198 U CN207577198 U CN 207577198U CN 201721479985 U CN201721479985 U CN 201721479985U CN 207577198 U CN207577198 U CN 207577198U
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 68
- 239000002184 metal Substances 0.000 claims abstract description 68
- 238000000034 method Methods 0.000 abstract description 21
- 230000001939 inductive effect Effects 0.000 abstract description 4
- 238000007493 shaping process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
A kind of non-contact flaring of pipe fitting that need not be placed in inside pipe fitting or method for flanging and device, including：Interior loop, the metal tube end regions to treat flange provide inductive loop；Exterior loop, the metal tube end regions to treat flange provide axial background magnetic field；Flanging die controls the flange height of flange metal tube；Coil power supply power-supply system provides energy for interior loop, exterior loop.The utility model can be flared for metal tube flange and provide a kind of non-contact radial electromagnetic force loaded from pipe fitting end, realize the non-contact flange expanding of miniature or special piece, improve component shaping performance.
Description
Technical Field
The utility model belongs to the metal processing field of making, in particular to need not to arrange inside pipe fitting non-contact flaring or the flanging device of pipe fitting in, mainly used metal pipe fitting's flaring or turn-ups processing.
Background
In the flanging or flaring of the conventional metal pipe, mechanical force or hydraulic pressure is usually applied to the interior of the metal pipe to drive the pipe to realize the flanging and flaring. On the other hand, since the forming force is a contact force, the formed workpiece has low flexibility, large residual stress and easy springback, and for light metal alloys such as aluminum alloy and magnesium alloy, the workpiece is easy to crack due to mechanical forming. On the other hand, the application of the contact force requires a medium, which must be placed inside the pipe, with major constraints on the shape, dimensions and spatial position of the pipe. For example: in a miniature or special-shaped pipe fitting, it is very difficult to place a force application medium inside the pipe fitting. Meanwhile, the existing non-contact flanging and flaring technology mainly depends on radial electromagnetic force generated by a forming coil to realize flanging and flaring of the pipe fitting. Although the method can effectively realize the electromagnetic flanging, the forming coil still needs to be arranged in the pipe fitting. The design and winding of the formed coil are greatly limited, so that the problem that the flanging and flaring cannot be realized due to the fact that a force application medium cannot be placed in a miniature or special-shaped pipe fitting cannot be solved.
Flanging and flaring of metal pipe fittings are common processing techniques in the industry. The traditional flanging and flaring process mainly adopts multiple working procedures of terrace die expansion, flattening and the like to finish the flanging of the metal pipe fitting, the process is complicated, meanwhile, the plastic deformation is easy to produce work hardening, and the forming limit of the metal pipe fitting is reduced.
At present, the flanging and flaring of the pipe fitting are realized mainly by adopting contact type mechanical force, Chinese patent CN 104741466A 'processing equipment of a metal pipe bell mouth' provides processing equipment of the metal pipe bell mouth, parts of the processing equipment which is greatly reduced, and the process of flanging and flaring forming can be completed by a flaring punch, so that the processing procedure is shortened, the production efficiency is greatly improved, and the reject ratio is reduced. But has low forming flexibility, large residual stress and easy rebound. The defects can be effectively improved by using non-contact pulse electromagnetic force, the pulse electromagnetic force is non-contact force based on the electromagnetic induction principle, the forming performance of a metal material can be effectively improved compared with mechanical force, the rebound of a formed workpiece is reduced, and the forming limit of the material is improved. Chinese patent (CN 104874664A) "a device and method for synchronously forming electromagnetic bulging and flanging of alloy pipe", discloses a device and method for synchronously forming electromagnetic bulging and flanging of alloy pipe, which realizes synchronous forming of electromagnetic bulging and flanging of alloy pipe, reduces rebound of workpiece, and reduces difficulty of die manufacturing. However, the core defect of the traditional processing technology or the electromagnetic forming technology is that the force application medium must be completely or partially arranged in the pipe fitting, the structure and the position of the force application medium are limited by the geometric dimension of the pipe fitting, and the problem of flanging and flaring of the miniature or special-shaped pipe fitting is difficult to solve.
A core disadvantage of the prior art is that the force application medium must be placed inside the tube. For the traditional machining process, the defects of low flexibility, large residual stress, easy generation of springback and the like of the formed workpiece exist. The existing electromagnetic flanging and flaring scheme improves the forming performance of the workpiece to a certain extent, but the forming coil still needs to be placed in the metal pipe fitting to generate radial electromagnetic force to realize flanging and flaring of the pipe fitting. The method is limited by the winding process of the formed coil and the spatial arrangement of the formed coil, and is difficult to be applied to flanging and flaring of miniature or special-shaped metal pipe fittings.
Disclosure of Invention
For solving the difficult problem of miniature or special-shaped pipe fitting turn-ups flaring, the utility model provides a need not to arrange inside pipe fitting non-contact flaring or the flanging device of pipe fitting in, can provide one kind from the loaded radial electromagnetic force of pipe fitting tip for metal pipe fitting turn-ups flaring, realize miniature or special-shaped pipe fitting non-contact turn-ups flaring processing, improve work piece formability.
The utility model discloses the technical scheme who takes does:
a pipe fitting non-contact flaring or flanging device that does not require placement inside a pipe fitting, the device comprising:
the inner coil is used for providing induced eddy current for the end area of the metal pipe fitting to be flanged;
the outer coil provides an axial background magnetic field for the end area of the metal pipe fitting to be flanged;
the flanging die is used for controlling the flanging height of the flanged metal pipe fitting;
and the coil power supply system is used for supplying energy to the inner coil and the outer coil.
The device is in an axisymmetrical structure, the inner coil is positioned right above the metal pipe fitting, the center of the metal pipe fitting is coaxial, the metal pipe fitting is matched with the placement position of the inner coil, the outer coil is placed outside the inner coil, and the two coils are positioned at the same level near the flanging end of the metal pipe fitting; the inner coil is connected with a pulse current power supply system with smaller pulse width, and the outer coil is connected with a pulse current power supply system with wider pulse width or connected with a steady-state current power supply; the metal pipe fitting is arranged inside the flanging die. The metal pipe fitting on one side of the flanging end is higher than the flanging die by the height of the flanging of the metal pipe fitting.
The utility model relates to a need not to arrange inside pipe fitting non-contact flaring or flanging device of pipe fitting in, realized producing radial electromagnetic force and then carrying out the method of turn-ups and flaring to the pipe fitting by the solenoid of arranging the pipe fitting tip in, compare traditional machining method and electromagnetic machining method, the utility model discloses inside the pipe fitting need not to arrange in to the coil, broken through the space restriction of force application medium laying position, reduced the requirement to aspects such as force application medium structure, material and size, greatly improved the flexibility of forming method to the difficult problem of miniature or special-shaped metal pipe fitting turn-ups flaring has been solved. In addition, because the forming force is pulse electromagnetic force, the forming device has the characteristics of non-contact and high speed, the resilience of the workpiece can be effectively reduced, the residual stress of the formed workpiece is reduced, and the forming performance of the workpiece is improved.
The utility model relates to a need not to arrange inside pipe fitting non-contact flaring or flanging device of pipe fitting in adopts two shaping coils to place at the metal pipe fitting tip and carry out the timesharing loading. The inner coil is mainly used for generating a pulse driving magnetic field and inducing annular eddy current at the end part of the metal pipe fitting; the outer coil is mainly used for generating an axial background magnetic field at the end part of the metal pipe fitting. Because the pulse width of the discharge current loaded by the inner coil is far smaller than that of the discharge current of the outer coil, the influence of the outer coil on the induced eddy current can be ignored, and meanwhile, because the number of turns of the outer coil is far larger than that of the inner coil, the influence of the inner coil on the background magnetic field can also be ignored. Therefore, under the interaction of the annular eddy current and the axial magnetic field, the end part of the metal pipe fitting is loaded with radial outward electromagnetic force, and the flanging and flaring processing of the metal pipe fitting is realized.
Drawings
Fig. 1 is an assembly schematic diagram of an electromagnetic flanging coil with a forming coil arranged at the end of a metal pipe fitting and loaded with radial electromagnetic force.
FIG. 2 is a schematic diagram showing the timing coordination of the current loading of the inner and outer coils.
Fig. 2(a) is a schematic diagram showing the timing matching of the inner and outer coil loading currents in which the outer coil loading current is a pulse current with a long pulse width.
Fig. 2(b) is a timing diagram of the loading current of the inner and outer coils, in which the loading current of the outer coil is a steady-state current.
Fig. 3(a) is an assembly view of an electromagnetic flanging device for loading radial electromagnetic force to a formed coil arranged at the end part of a metal pipe fitting.
Fig. 3(b) is an assembled cross-sectional view of an electromagnetic flanging device for loading radial electromagnetic force to a formed coil arranged at the end of a pipe fitting.
Fig. 4(a) is a schematic view showing an initial state of the pipe before flanging.
Fig. 4(b) is a schematic diagram of the deformation state of the pipe in the flanging process.
Fig. 4(c) is a schematic view of the final state of the pipe after the flanging is completed.
Detailed Description
Principle analysis:
a method for expanding or flanging a pipe fitting without being placed in the pipe fitting in a non-contact manner comprises the steps that two forming coils are matched, an inner coil 1 and an outer coil 2 are placed at the end part of a metal pipe fitting 3 in parallel, the inner coil 1 is close to the end part area of the pipe fitting and is mainly used for inducing eddy currents in the metal pipe fitting 3, the outer coil 2 is placed outside the inner coil 1 and is mainly used for providing a large background magnetic field in the pipe fitting, and the two coils are flush with each other near the end part of the pipe fitting.
The loaded pulse current of interior coil 1 and outer coil 2 cooperatees in the chronogenesis, because the loaded discharge current pulse width of interior coil 1 is less than the discharge current of outer coil 2 far away, can neglect the influence of outer coil to the induced vortex, simultaneously because the number of turns of outer coil 2 is far greater than interior coil 1, the influence of interior coil 1 to the background magnetic field also can neglect.
The inner coil 1 is loaded when the discharge current applied to the outer coil 2 reaches a peak value, so as to utilize the axial magnetic field generated by the outer coil 2 to the maximum extent. At this time, the toroidal eddy current and the axial magnetic field interact with each other to generate the maximum radial electromagnetic force in the metal pipe fitting 3, thereby realizing the flanging processing of the metal pipe fitting 3.
A pipe fitting non-contact flaring or flanging method without being arranged in the pipe fitting comprises the following steps:
step 1: two driving coils with different turns are adopted, the number of turns of the inner coil is far smaller than that of the outer coil, the two coils are coaxial, and the inner coil and the outer coil are arranged in a flush manner near the end part of the metal pipe fitting 3;
step 2: the metal pipe fitting 3 is placed right below the inner coil and is fixed by a flanging die 4;
and step 3: the height of the flanging is controlled by a flanging die 4;
and 4, step 4: the outer coil is loaded with pulse current with long pulse width or steady-state current to generate an axial background magnetic field, and when the background magnetic field is about to reach a peak value, the inner coil is loaded with pulse current induction eddy current with reverse short pulse width;
and 5: under the combined action of the axial background magnetic field and the induced eddy current, the end part of the metal pipe fitting 3 is subjected to radial electromagnetic force to drive the metal pipe fitting 3 to realize flanging.
The coil is all arranged in 3 tip of metal pipe fitting, and inside and outside coil is mutually supported, and inside coil is coaxial with the outer coil, and inside and outside coil is close to pipe fitting end department in the parallel and level, exerts the radial electromagnetic force of non-contact to the pipe fitting tip.
The number of turns of the inner coil 1 is much smaller than that of the outer coil 2. The inner coil 1 has fewer turns and is mainly used for inducing eddy current; the outer coil 2 has more turns and is mainly used for generating a larger background magnetic field.
The outer coil 2 is loaded with pulse current with long pulse width or steady-state current, and the inner coil 1 is loaded with reverse pulse current with short pulse width. Because the pulse current generates a pulse magnetic field, the pulse magnetic field generates induced eddy currents in the metal workpiece, and the induced eddy currents and the pulse magnetic field act together to generate Lorentz force to drive the metal material to complete deformation. In the process, the magnitude and the direction of the Lorentz force satisfy the following conditions:
wherein,is an induced eddy current that is induced in the magnetic field,is the pulsed magnetic field, and x represents the cross product of the vector.
In the formula, the magnitude of the induced eddy current is in direct proportion to the change rate of the pulse magnetic field, and the direction meets Lenz's law. Therefore, if only one coil is used, the magnitude and direction of the induced eddy current are highly coupled to the pulsed magnetic field, and the lorentz force generated by the combined action is not controllable in direction under normal conditions.
In the model shown in fig. 1, the outer coil 2 is fed with a pulse current or a steady-state current with a long pulse width, the direction of an axial magnetic field generated by the pulse current or the steady-state current is downward, the induced eddy current generated in the workpiece is annular, the direction is counterclockwise, the lorentz force generated by the combined action of the outer coil and the induced eddy current is a radial force, and the direction is radially inward. Therefore, if only the single coil is adopted, the radially outward Lorentz force cannot be generated to drive the material to deform to complete flanging and flaring. For this purpose, an inner coil 1 is introduced, which is supplied with a short-pulse-width reverse pulse current. Because the number of turns is smaller than that of the outer coil 2, the generated magnetic field is not high, but the current change rate is far larger than that of the outer coil 2, and the amplitude of induced eddy current generated in the workpiece is larger. Under the combined action of the inner coil and the outer coil, the direction of the magnetic field on the workpiece is still axially downward, but the direction of the induced eddy current is annular clockwise, and the Lorentz force applied to the workpiece is changed into radial outward, so that the material is driven to complete deformation to realize flanging and flaring.
The time sequence relation of the loading currents of the inner coil and the outer coil is as follows: and when the pulse current loaded by the outer coil is about to reach the peak value, the pulse current loaded by the inner coil. When the pulse current loaded by the outer coil is about to reach the peak value, the pulse magnetic field reaches the peak value, and the Lorentz force generated at the moment is also maximum according to the calculation formula of the Lorentz force.
The effective time of the loading of the radial electromagnetic force is as follows: the inner coil is loaded with a rising edge of current. According to lenz's law, the magnetic field of the induced current always counteracts the change in the magnetic flux causing the induced current. Specifically, in the model shown in fig. 1, when the current applied to the inner coil 1 is at the rising edge, the generated axial magnetic field gradually increases, and the induced eddy current will hinder the increase of the magnetic field, so the direction of the induced eddy current is opposite to the direction of the current applied to the coil, and is clockwise in the circumferential direction, and the direction of the generated lorentz force is radially outward. When the loading current is at the falling edge, the axial magnetic field generated by the loading current is gradually reduced, and the induced eddy current hinders the reduction of the magnetic field, so that the direction of the induced eddy current is changed to be the same as the direction of the loading current of the coil, namely, the direction is changed to be annular anticlockwise, the generated Lorentz force is changed from radial outward to radial inward, and the material cannot be driven to deform to finish flanging and flaring. The effective time for loading the radial electromagnetic force is therefore the rising edge of the inner coil loading current.
A pipe fitting non-contact flaring or flanging method without being arranged in the pipe fitting comprises the following steps:
(1) the inner coil 1 and the outer coil 2 are installed and are connected with the power supplies matched with each other;
(2) placing the metal pipe fitting 3 into the flanging die 4, and controlling the flanging height required by the metal pipe fitting 3 by the flanging die 4;
(3) the outer coil 2 is loaded with a negative pulse current 7 with a long pulse width or a negative steady-state current 8 to provide an axially downward background magnetic field for the flanging position of the metal pipe fitting 3;
(4) after the negative pulse current 7t1 is loaded on the outer coil 2, the discharging current of the outer coil is about to reach the peak value; or after the outer coil at the end part is loaded with negative steady-state current 8t3, the inner coil 1 is loaded with positive pulse current 6 with short pulse width at the moment, and circumferential eddy current is induced at the flanging position of the metal pipe fitting 3;
(5) and pulse current is in t 1-t 2 or steady-state current is in t 3-t 4, and the end part of the metal pipe fitting 3 is subjected to radially outward electromagnetic force under the interaction of an axial background magnetic field and toroidal eddy current to drive the end part of the metal pipe fitting 3 to deform so as to realize flanging, as shown in fig. 4 (c).
A pipe fitting non-contact flaring or flanging device that does not require placement inside a pipe fitting, the device comprising:
the inner coil 1 is used for providing induced eddy current for the end area of the metal pipe fitting 3 to be flanged;
the outer coil 2 is used for providing an axial background magnetic field for the end area of the metal pipe fitting 3 to be flanged;
the flanging die 4 is used for controlling the flanging height of the flanging metal pipe fitting 3;
and the coil power supply system is used for providing energy for the inner coil 1 and the outer coil 2.
The flanging die 4 is a female die, can be made of any material, is used for controlling the flanging height and the final shape of the workpiece, has a structure depending on the target shape of the workpiece to be flanged, and can be identical to the female die used for general machining.
The coil power supply system is a pulse power supply and generally comprises a charging system, an energy storage system and a discharging circuit. Firstly, the charging system supplies electric energy to the energy storage system to complete energy accumulation; and then the energy of the energy storage system is rapidly discharged to the coil through the discharge circuit.
Fig. 3 is an assembly diagram of an electromagnetic flanging coil with a forming coil arranged on one side of the end of a pipe fitting and loaded with radial electromagnetic force. The device is of an axisymmetrical structure, the inner coil 1 is positioned 5mm above the metal pipe fitting 3, the center of the inner coil is coaxial, the metal pipe fitting 3 is matched with the placement position of the inner coil 1, the number of turns of the inner coil 1 is 3 multiplied by 3, and the sectional area of each turn of the coil is 2mm multiplied by 4 mm; the outer coil 2 is arranged outside the inner coil 1, the number of turns is 6 multiplied by 6, and the cross-sectional area of each turn of the coil is the same as that of the inner coil 1. The two coils are flush near the flanged end of metal fitting 3. The inner coil 1 is connected with a pulse current power supply system with smaller pulse width, and the outer coil 2 is connected with a pulse current power supply system with wider pulse width or connected with a steady-state current power supply. The metal pipe 3 is arranged in the flanging die 4, and the part of the metal pipe 3 at one side of the flanging end is higher than the flanging die 4 by the flanging height of the metal pipe 3. Fig. 3(a) and 3(b) are an assembly view of the electromagnetic bulging apparatus and an assembly cross-sectional view thereof.
Claims (2)
1. A pipe fitting non-contact flaring or flanging device which is not required to be arranged inside a pipe fitting is characterized by comprising: the inner coil (1) is used for providing induced eddy current for the end area of the metal pipe fitting (3) to be flanged;
the outer coil (2) is used for providing an axial background magnetic field for the end area of the metal pipe fitting (3) to be flanged;
the flanging die (4) is used for controlling the flanging height of the flanging metal pipe fitting (3);
the coil power supply system is used for providing energy for the inner coil (1) and the outer coil (2);
the device is of an axisymmetrical structure, the inner coil (1) is positioned right above the metal pipe fitting (3) and is coaxial in center, the metal pipe fitting (3) is matched with the placement position of the inner coil (1), the outer coil (2) is placed outside the inner coil (1), and the two coils are positioned at the same level close to the flanging end of the metal pipe fitting (3);
the inner coil (1) is connected with a pulse current power supply system with smaller pulse width, and the outer coil (2) is connected with the pulse current power supply system with wider pulse width or connected with a steady-state current power supply;
the metal pipe fitting (3) is arranged inside the flanging die (4).
2. The pipe fitting non-contact flaring or flanging device which is not required to be arranged inside a pipe fitting according to claim 1, is characterized in that: the metal pipe fitting (3) at one side of the flanging end is higher than the flanging die (4) by the flanging height of the metal pipe fitting (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721479985.6U CN207577198U (en) | 2017-11-08 | 2017-11-08 | A kind of non-contact flaring of pipe fitting that need not be placed in inside pipe fitting or hemmer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721479985.6U CN207577198U (en) | 2017-11-08 | 2017-11-08 | A kind of non-contact flaring of pipe fitting that need not be placed in inside pipe fitting or hemmer |
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| CN207577198U true CN207577198U (en) | 2018-07-06 |
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| CN201721479985.6U Expired - Fee Related CN207577198U (en) | 2017-11-08 | 2017-11-08 | A kind of non-contact flaring of pipe fitting that need not be placed in inside pipe fitting or hemmer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107774780A (en) * | 2017-11-08 | 2018-03-09 | 三峡大学 | A kind of non-contact enlarging of pipe fitting that need not be placed in inside pipe fitting or method for flanging and device |
| CN109967594A (en) * | 2019-03-18 | 2019-07-05 | 三峡大学 | Corrugated device and method when a kind of reduction tube compression using axial magnetic pulling force |
| 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 |
-
2017
- 2017-11-08 CN CN201721479985.6U patent/CN207577198U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107774780A (en) * | 2017-11-08 | 2018-03-09 | 三峡大学 | A kind of non-contact enlarging of pipe fitting that need not be placed in inside pipe fitting or method for flanging and device |
| CN109967594A (en) * | 2019-03-18 | 2019-07-05 | 三峡大学 | Corrugated device and method when a kind of reduction tube compression using axial magnetic pulling force |
| 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 |
| CN109967593B (en) * | 2019-03-18 | 2020-06-16 | 三峡大学 | Device and method for achieving electromagnetic bulging axial compression of pipe fitting by adopting radial constant magnetic field and induced eddy current |
| CN109967594B (en) * | 2019-03-18 | 2020-07-07 | 三峡大学 | Device and method for reducing wrinkling of pipe fitting during compression by adopting axial electromagnetic tension |
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Granted publication date: 20180706 |