CN108405700B - Flexible electromagnetic forming method and device for coupling cooling type pipe fitting - Google Patents
Flexible electromagnetic forming method and device for coupling cooling type pipe fitting Download PDFInfo
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- 238000010168 coupling process Methods 0.000 title claims abstract description 118
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- 238000001816 cooling Methods 0.000 title claims abstract description 112
- 230000008878 coupling Effects 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000010410 layer Substances 0.000 claims description 47
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 39
- 229910052802 copper Inorganic materials 0.000 claims description 27
- 239000010949 copper Substances 0.000 claims description 27
- 238000007906 compression Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 9
- 239000002356 single layer Substances 0.000 claims description 8
- 230000017525 heat dissipation Effects 0.000 abstract description 7
- 230000001808 coupling effect Effects 0.000 abstract description 2
- 238000004804 winding Methods 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 230000006698 induction Effects 0.000 description 13
- 230000006835 compression Effects 0.000 description 9
- 238000007599 discharging Methods 0.000 description 6
- 239000003822 epoxy resin Substances 0.000 description 6
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- 229910000838 Al alloy Inorganic materials 0.000 description 1
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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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Abstract
A flexible electromagnetic forming method and device for a coupling cooling type pipe fitting comprises a multi-turn multi-layer main coil for generating a pulse strong magnetic field; a flexible electromagnetic force coil for helping the multi-turn multi-layer main coil to enhance a coupling effect; the heat of the multi-turn multi-layer main coil is taken away, and the coupling cooling coil for cooling the multi-turn multi-layer main coil is realized; the compressed air condensing tube is used for accelerating heat dissipation of the coupling cooling coil; and the pulse power supply and the control switch are used for supplying power to the multi-turn multi-layer main coil. The flexible electromagnetic force coil is adopted to strengthen electromagnetic force, and meanwhile, the flexible control of the electromagnetic force is realized through the structure of the flexible electromagnetic force coil; the mutual coupling between the coupling cooling coil and the main coil is utilized to generate induced eddy current, so that part of heat in the main coil is taken away, the temperature rise of the main coil is reduced, and the purpose of prolonging the service life of the main coil is achieved.
Description
Technical Field
The invention relates to a flexible electromagnetic forming method and device for a coupling cooling type pipe fitting, which are applied to the field of metal material processing.
Background
The light weight is an important technical means for realizing energy conservation and emission reduction in the fields of aerospace, automobile industry and the like. The main way of realizing the light weight is to adopt light alloy materials, and high-performance aluminum alloy, titanium alloy and magnesium alloy become the first choice materials for realizing the light weight in modern aerospace, automobile industry and the like; electromagnetic forming is a high-speed pulse forming technology, can greatly improve the forming performance of metal materials, and is one of effective means for solving the forming difficulty of light alloy.
In the current electromagnetic forming process of the metal pipe fitting, electromagnetic force of the pipe fitting is generated by the action of pulse current of the main coil and induced eddy current of the pipe fitting, and the distribution of the electromagnetic force is difficult to control, particularly, the axial distribution of the electromagnetic force of the pipe fitting is uneven due to the end effect of the main coil; in addition, the pipe fitting is a single-turn closed loop, and the electromagnetic coupling efficiency of the pipe fitting and the main coil is low, so that the total electromagnetic force is smaller; moreover, in order to achieve certain mechanical strength, the main coil generally adopts a dense winding, so that the heat dissipation capacity of the main coil is poor, and further, the main coil is insulated and aged, and the service life of the main coil is reduced.
At present, electromagnetic forming is mainly divided into plate electromagnetic forming and pipe electromagnetic forming according to the type of a processed workpiece, and the technical scheme provided by the invention is mainly aimed at electromagnetic forming of metal pipes. The invention provides a magnetic collector method adopting pulse forming, which concentrates the generated electromagnetic force and ensures that the forming effect of a workpiece is improved. However, the patent only concentrates the electromagnetic force more and does not realize the controllability of the electromagnetic force. The patent ' electromagnetic forming device and method for metal pipe fittings ' (CN 106694681A) ', discloses a method for electromagnetic forming of metal pipe fittings by loading radially and axially simultaneously, which adopts two sets of power supplies and two sets of coils to supply power for driving coils in a matched manner, thereby realizing the increase of electromagnetic force and the increase of forming effect of metal pipe fittings. However, this approach requires multiple sets of power supplies, multiple sets of coils, and has a low coupling coefficient. The patent 'a coil heat dissipation device (CN 204168702U)', provides a coil heat dissipation device, can guarantee the normal heat dissipation of electromagnetic devices, prolongs the service life of electromagnetic devices. However, the device comprises a plurality of parts, is complex to install and has strict limitation on the specification of the coil.
Disclosure of Invention
Based on the technical problems, in order to realize the controllability of the electromagnetic force of the pipe fitting, improve the electromagnetic forming efficiency of the pipe fitting, reduce the temperature of the main coil and improve the service life of the main coil, the invention provides a coupling cooling type flexible electromagnetic forming method and device for the pipe fitting; the flexible electromagnetic force coil is adopted to strengthen electromagnetic force, and meanwhile, the flexible control of the electromagnetic force is realized through the structure of the flexible electromagnetic force coil; the mutual coupling between the coupling cooling coil and the main coil is utilized to generate induced eddy current, so that part of heat in the main coil is taken away, the temperature rise of the main coil is reduced, and the purpose of prolonging the service life of the main coil is achieved.
The technical scheme adopted by the invention is as follows:
A flexible electromagnetic forming method of a coupling cooling type pipe fitting,
(A) When the pipe fitting swells, a flexible electromagnetic force coil is arranged on the outer side of the multi-turn multi-layer main coil and the inner side of the pipe fitting;
radial single-layer axial multi-turn coupling cooling coils with equal height are arranged on the inner side of the main coil;
An axial single-layer radial multi-turn coupling cooling coil is placed close to the upper part and the lower part of the main coil;
placing compressed air condensing pipes close to all the coupling cooling coils;
The main coil, the flexible electromagnetic force coil, the coupling cooling coil and the pipe fitting are all arranged horizontally and coaxially.
The specific process comprises the following steps:
Closing a control switch, wherein pulse current is generated in the main coil, induced eddy current is generated in the flexible electromagnetic force coil, and electromagnetic force between the main coil and the flexible electromagnetic force coil drives the flexible electromagnetic force coil to accelerate, and the shape of the flexible electromagnetic force coil is gradually expanded from a gear shape to a circular shape;
the pipe fitting is driven to bulge in the expansion process of the flexible electromagnetic force coil, so that the processing is completed;
in addition, induced current is generated in the coupling cooling coils arranged in the main coil, at the upper part and the lower part, so that part of Joule heat in the main coil is taken away, and the temperature rise of the main coil is reduced; and meanwhile, a compressed air condensing system arranged in the coupling cooling coil works to cool the coupling cooling coil.
(B) When the pipe fitting is compressed, a flexible electromagnetic force coil is arranged at the inner side of the multi-turn multi-layer main coil and the outer side of the pipe fitting;
The radial single-layer axial multi-turn coupling cooling coils with equal height are closely arranged on the outer side of the main coil;
An axial single-layer radial multi-turn coupling cooling coil is placed close to the upper part and the lower part of the main coil;
placing compressed air condensing pipes close to all the coupling cooling coils;
The main coil, the flexible electromagnetic force coil, the coupling cooling coil and the pipe fitting are all arranged horizontally and coaxially.
The specific process comprises the following steps:
Closing a control switch, wherein pulse current is generated in the main coil, induced eddy current is generated in the flexible electromagnetic force coil, electromagnetic force between the main coil and the flexible electromagnetic force coil drives the flexible electromagnetic force coil to accelerate, and the shape of the flexible electromagnetic force coil is gradually compressed into a gear shape from a circular ring shape;
the pipe fitting is driven to be compressed in the compression process of the flexible electromagnetic force coil, so that the processing is completed;
In addition, induced current is generated in the coupling cooling coils arranged outside, above and below the main coil, so that part of Joule heat in the main coil is taken away, and the temperature rise of the main coil is reduced; and meanwhile, a compressed air condensing system arranged in the coupling cooling coil works to cool the coupling cooling coil.
A flexible electromagnetic forming device of a coupling cooling type pipe fitting comprises a multi-turn multi-layer main coil for generating a pulse strong magnetic field; a flexible electromagnetic force coil for helping the multi-turn multi-layer main coil to enhance a coupling effect;
the heat of the multi-turn multi-layer main coil is taken away, and the coupling cooling coil for cooling the multi-turn multi-layer main coil is realized;
the compressed air condensing tube is used for accelerating heat dissipation of the coupling cooling coil;
the pulse power supply and the control switch are used for supplying power to the multi-turn multi-layer main coil;
The pulse power supply is connected with the multi-turn multi-layer main coil and the flexible electromagnetic force coil through the control switch.
The flexible electromagnetic force coil is made of flexible copper braided tape; when the pipe fitting swells, the flexible electromagnetic force coil is in a gear shape and is acted by the electromagnetic force of the main coil, the flexible electromagnetic force coil can be automatically expanded into a circular ring, and the flexible electromagnetic force coil can be restored to the gear shape after the stress is finished; when the pipe fitting is compressed, the reinforced flexible coil is automatically compressed into a gear shape under the electromagnetic force action of the main coil, and is restored into a circular ring after the stress is finished; the flexibility of the flexible electromagnetic force coil is such that it is not subjected to stress.
The flexible electromagnetic force coil is a radial single-turn and axial multi-layer self-closing coil.
The electromagnetic force distribution may be controlled by changing the spacing between the single turns of the flexible electromagnetic force coil, the cross-sectional area of the single turn coil, etc.
The coupling cooling coil is a copper bare wire, and has high heat dissipation efficiency.
The coupling cooling coils are mutually insulated annular self-closing short-circuit coils.
The coupling cooling coils are arranged in three areas outside the forming area of the main coil, the 3 coupling cooling coils are coupled to generate induction current, and a plurality of channels take away heat of the main coil, so that the main coil is cooled.
The compressed air condensing pipes are uniformly distributed on the surfaces of all the coupling cooling coils, and continuously take away the heat of the coupling cooling coils.
The invention relates to a flexible electromagnetic forming method and a device for a coupling cooling type pipe fitting, which have the advantages that compared with the prior best technology, the invention has the following advantages:
1. The invention relates to a method and a device for flexible electromagnetic forming of a coupling cooling type pipe fitting, which are characterized in that a flexible electromagnetic force coil is added in the pipe fitting processing process, the electromagnetic force born by the pipe fitting is larger, and the electromagnetic forming effect of the pipe fitting is better compared with the electromagnetic forming of the former pipe fitting.
2. The flexible electromagnetic force coil is adopted as a flexible metal braided belt, so that uniform flexible stress is realized, the shape can be automatically adjusted in the stress process, and the flexible electromagnetic force coil can not bear stress due to the flexibility of the flexible electromagnetic force coil.
3. The invention can control the electromagnetic force distribution by changing the interval between single turns of the flexible electromagnetic force coil, the cross section area of the single turn coil and the like, so that the electromagnetic force applied by the flexible electromagnetic force coil can be controlled.
4. Compared with the former tubular electromagnetic forming, the method and the device for flexible electromagnetic forming of the coupling cooling type pipe fitting can effectively take away the heat of the main coil, reduce the temperature of the main coil and prolong the service life of the main coil by arranging the coupling cooling coils in all non-forming areas of the main coil.
5. According to the invention, the metal condenser tube is placed close to the coupling cooling coil, freon is introduced into the metal tube, and heat is dissipated through circulation of the compressed air machine, so that a part of heat can be simply and effectively taken away, the heat of the main coil can be dissipated in a plurality of times of circulation, and the temperature of the main coil is reduced.
6. Meanwhile, the electromagnetic force distribution of the coil is changed by changing the interval between the single turns of the flexible electromagnetic force coil and changing the cross sectional area of each single turn of the coil, as shown in fig. 3 (a), 3 (b) and 3 (c), so that the electromagnetic force is controllable.
Drawings
Fig. 1 (a) is a schematic diagram of a flexible electromagnetic forming structure (bulging) of a coupling cooling type pipe fitting.
Fig. 1 (b) is a schematic view (compression) of a flexible electromagnetic forming structure for a coupling cooling type pipe fitting.
Fig. 2 (a) is a cross-sectional view of an equidistant, uniform cross-section circular flexible electromagnetic force coil.
Fig. 2 (b) is a cross-sectional view of an unequal-pitch annular flexible electromagnetic force coil.
Fig. 2 (c) is a cross-sectional view of a circular flexible electromagnetic force coil of different cross-sections.
Fig. 3 (a) is a cross-sectional view of a flexible electromagnetic force coil of a constant-pitch constant-section gear.
Fig. 3 (b) is a cross-sectional view of the flexible electromagnetic force coil of the unequal-pitch gear.
Fig. 3 (c) is a cross-sectional view of a gear flexible electromagnetic force coil of different cross-sections.
Fig. 4 (a) is a top view (bulging) of the flexible electromagnetic force coil in an initial state.
Fig. 4 (b) is a top view (bulging) of the flexible electromagnetic force coil in an expanded state.
Fig. 4 (c) is a top view (compression) of the flexible electromagnetic force coil in an initial state.
Fig. 4 (d) is a top view (compression) of the flexible electromagnetic force coil in a compressed state.
Wherein:
1-multiturn multilayer main coil;
2-a flexible electromagnetic force coil; 21-flexible electromagnetic force coil initial state (tube bulging); 22-flexible electromagnetic force coil expanded state (tube bulging); 23-flexible electromagnetic force coil initial state (tubing compression); 24-flexible electromagnetic force coil compressed state (tube compression);
3-coupling cooling coils (inner and outer);
4-a workpiece;
5-compressed air condensing tubes;
6-coupling a cooling coil (upper side);
7-coupling a cooling coil (underside);
8-a high-voltage pulse power supply;
9-control switch.
Detailed Description
The flexible electromagnetic forming method of the coupling cooling type pipe fitting comprises the following two different forming modes:
a. The electromagnetic forming and cooling method for radial expansion pipe fitting comprises the following steps: closing a control switch, generating pulse current in the main coil, generating induced eddy current in the flexible electromagnetic force coil, and driving the flexible electromagnetic force coil to accelerate by electromagnetic force between the main coil and the flexible electromagnetic force coil, wherein the shape of the flexible electromagnetic force coil is gradually expanded from a gear shape to a circular shape; and driving the pipe fitting to bulge in the expansion process of the flexible electromagnetic force coil, and finishing the processing. In addition, induced current is generated in the coupling cooling coils arranged in the main coil, at the upper part and the lower part, so that part of Joule heat in the main coil is taken away, and the temperature rise of the main coil is reduced; and meanwhile, a compressed air condensing system arranged on the surface of the coupling cooling coil works to cool the coupling cooling coil.
B. the electromagnetic forming and cooling method of the radial compression type pipe fitting comprises the following steps: closing a control switch, generating pulse current in the main coil, generating induced eddy current in the flexible electromagnetic force coil, and driving the flexible electromagnetic force coil to accelerate by electromagnetic force between the main coil and the flexible electromagnetic force coil, wherein the shape of the flexible electromagnetic force coil is gradually compressed into a gear shape from a circular ring shape; and driving the pipe fitting to compress in the compression process of the flexible electromagnetic force coil, so as to finish the processing. In addition, induced current is generated in the coupling cooling coils arranged outside, above and below the main coil, so that part of Joule heat in the main coil is taken away, and the temperature rise of the main coil is reduced; and meanwhile, a compressed air condensing system arranged on the surface of the coupling cooling coil works to cool the coupling cooling coil.
Meanwhile, the electromagnetic force distribution of the coil is changed by changing the interval between the single turns of the flexible electromagnetic force coil and changing the cross sectional area of each single turn of the coil, as shown in fig. 3 (a), 3 (b) and 3 (c), so that the electromagnetic force is controllable.
The specific embodiment is as follows:
Example 1:
implementation of flexible electromagnetic forming (pipe bulging) of a coupling cooling type pipe fitting with equidistant same-section flexible electromagnetic force coils and coupling cooling coils:
As shown in fig. 1 (a), a copper wire coil set (copper wires are insulated from each other, a framework inside the coil is an epoxy resin plate, and the outer surface of the copper wire coil is wrapped by a novel super strong fiber Zylon for reinforcement) which is wound into 8 turns and 10 layers is needed. A single-turn 8-layer self-closing flexible electromagnetic force coil with equal spacing and same section, which is wound by copper braided wires, is tightly attached to the outer surface of the main coil, the winding shape of the coil is shown in fig. 3 (a), and the shape of the coil is gradually expanded from a gear shape to an annular shape in the coupling process of the flexible electromagnetic force coil and the main coil as shown in fig. 2 (a). An equidistant self-closing annular tubular coil wound by copper braided wires is used as a coupling cooling coil, the winding mode is 2 turns and 10 layers, the coil is equal in height to the main coil, and the coil is closely placed on the inner side of the main coil; the self-closing coupling cooling coils which are provided with 7 turns and are arranged at equal intervals and are woven by 2 pieces of copper are closely arranged above and below the main coil and are arranged concentrically with the main coil. The shaped tubular workpiece was placed outside the flexible electromagnetic force coil with a gap of 5mm from the flexible electromagnetic force coil. Placing the elements in a horizontal coaxial arrangement; and a high-voltage pulse power supply, a control switch and a main coil are connected in series. Turning on a control switch, discharging the main coil by a pulse power supply, and changing the state of the flexible electromagnetic force coil from an initial state 21 in fig. 4 (a), fig. 4 (b), fig. 4 (c) and fig. 4 (d) to an expanded state 22 by interaction between the pulse current of the main coil and the induction current of the flexible electromagnetic force coil, so as to drive the flexible electromagnetic force coil to accelerate and drive the forming workpiece to finish forming; the 3 coupling cooling coils simultaneously generate the Joule heat generated by the induction current transfer main coil, so that the temperature of the main coil is reduced, and a metal condensing tube is arranged on the surface of the coupling cooling coils, and the heat of the coupling cooling coils is taken away by a compressed air condensing and circulating system, so that the main coil can be repeatedly cooled.
Example 2:
implementation of flexible electromagnetic forming (pipe bulging) of a coupling cooling pipe fitting with unequal-spacing flexible electromagnetic force coils and coupling cooling coils:
As shown in fig. 1 (a), a copper wire coil set (copper wires are insulated from each other, a framework inside the coil is an epoxy resin plate, and the outer surface of the copper wire coil is wrapped by a novel super strong fiber Zylon for reinforcement) which is wound into 8 turns and 10 layers is needed. The copper braided wire-wound single-turn 8-layer self-closing flexible electromagnetic force coil with unequal intervals is closely attached to the outer surface of the main coil, the coil winding shape is shown in fig. 3 (b), and the shape of the flexible electromagnetic force coil is gradually expanded from a gear shape to an annular shape in the coupling process of the flexible electromagnetic force coil and the main coil as shown in fig. 2 (b). An equidistant self-closing annular tubular coil wound by copper braided wires is used as a coupling cooling coil, the winding mode is 2 turns and 10 layers, the coil is equal in height to the main coil, and the coil is closely placed on the inner side of the main coil; the self-closing coupling cooling coils which are provided with 7 turns and are arranged at equal intervals and are woven by 2 pieces of copper are closely arranged above and below the main coil and are arranged concentrically with the main coil. The shaped tubular workpiece was placed outside the flexible electromagnetic force coil with a gap of 5mm from the flexible electromagnetic force coil. Placing the elements in a horizontal coaxial arrangement; and a high-voltage pulse power supply, a control switch and a main coil are connected in series. Turning on a control switch, discharging the main coil by a pulse power supply, and changing the state of the flexible electromagnetic force coil from an initial state 21 in fig. 4 (a), fig. 4 (b), fig. 4 (c) and fig. 4 (d) to an expanded state 22 by interaction between the pulse current of the main coil and the induction current of the flexible electromagnetic force coil, so as to drive the flexible electromagnetic force coil to accelerate and drive the forming workpiece to finish forming; the 3 coupling cooling coils simultaneously generate the Joule heat generated by the induction current transfer main coil, so that the temperature of the main coil is reduced, and a metal condensing tube is arranged on the surface of the coupling cooling coils, and the heat of the coupling cooling coils is taken away by a compressed air condensing and circulating system, so that the main coil can be repeatedly cooled.
Example 3:
implementation of flexible electromagnetic forming (pipe bulging) of a coupling cooling pipe fitting with a flexible electromagnetic force coil and a coupling cooling coil with unequal cross sections:
As shown in fig. 1 (a), a copper wire coil set (copper wires are insulated from each other, a framework inside the coil is an epoxy resin plate, and the outer surface of the copper wire coil is wrapped by a novel super strong fiber Zylon for reinforcement) which is wound into 8 turns and 10 layers is needed. The single-turn 8-layer self-closing flexible electromagnetic force coil with different sections, which is wound by copper braided wires, is tightly attached to the outer surface of the main coil, the winding shape of the coil is shown in fig. 3 (c), and the shape of the coil is gradually expanded from a gear shape to an annular shape in the coupling process of the flexible electromagnetic force coil and the main coil as shown in fig. 2 (c). An equidistant self-closing annular tubular coil wound by copper braided wires is used as a coupling cooling coil, the winding mode is 2 turns and 10 layers, the coil is equal in height to the main coil, and the coil is closely placed on the inner side of the main coil; the self-closing coupling cooling coils which are provided with 7 turns and are arranged at equal intervals and are woven by 2 pieces of copper are closely arranged above and below the main coil and are arranged concentrically with the main coil. The shaped tubular workpiece was placed outside the flexible electromagnetic force coil with a gap of 5mm from the flexible electromagnetic force coil. Placing the elements in a horizontal coaxial arrangement; and a high-voltage pulse power supply, a control switch and a main coil are connected in series. Turning on a control switch, discharging the main coil by a pulse power supply, and changing the state of the flexible electromagnetic force coil from an initial state 21 in fig. 4 (a), fig. 4 (b), fig. 4 (c) and fig. 4 (d) to an expanded state 22 by interaction between the pulse current of the main coil and the induction current of the flexible electromagnetic force coil, so as to drive the flexible electromagnetic force coil to accelerate and drive the forming workpiece to finish forming; the 3 coupling cooling coils simultaneously generate the Joule heat generated by the induction current transfer main coil, so that the temperature of the main coil is reduced, and a metal condensing tube is arranged on the surface of the coupling cooling coils, and the heat of the coupling cooling coils is taken away by a compressed air condensing and circulating system, so that the main coil can be repeatedly cooled.
Example 4:
Implementation of flexible electromagnetic forming (pipe compression) of coupling cooling type pipe fitting with equidistant same-section flexible electromagnetic force coil and coupling cooling coil:
as shown in fig. 1 (b), a copper wire coil set (copper wires are insulated from each other, a framework inside the coil is an epoxy resin plate, and the outer surface of the copper wire coil is wrapped by a novel super strong fiber Zylon for reinforcement) which is wound into 8 turns and 10 layers is needed. The single-turn 8-layer self-closing flexible electromagnetic force coil with the same spacing and same section, which is wound by copper braided wires, is closely placed on the inner side surface of the main coil, the winding shape of the coil is shown in fig. 2 (a), and the shape of the coil wound by the electromagnetic force is compressed from a circular ring shape to a gear shape as shown in fig. 3 (a). An equidistant self-closing annular tubular coil wound by copper braided wires is used as a coupling cooling coil, the winding mode is 2 turns and 10 layers, the winding mode is equal to the main coil in height, and the winding mode is placed outside the main coil; the self-closing coupling cooling coils which are provided with 7 turns and are arranged at equal intervals and are woven by 2 pieces of copper are closely arranged above and below the main coil and are arranged concentrically with the main coil. The shaped tubular workpiece was placed inside the flexible electromagnetic force coil with a gap of 5mm from the flexible electromagnetic force coil. Placing the elements in a horizontal coaxial arrangement; and a high-voltage pulse power supply, a control switch and a main coil are connected in series. Turning on the control switch, discharging the main coil by the pulse power supply, and changing the state of the flexible electromagnetic force coil from an initial state 23 in fig. 4 (a), fig. 4 (b), fig. 4 (c) and fig. 4 (d) to a compressed state 24 by the interaction between the pulse current of the main coil and the induction current of the flexible electromagnetic force coil, so as to drive the flexible electromagnetic force coil to accelerate and drive the forming workpiece to finish forming; the 3 coupling cooling coils simultaneously generate the Joule heat generated by the induction current transfer main coil, so that the temperature of the main coil is reduced, and a metal condensing tube is arranged on the surface of the coupling cooling coils, and the heat of the coupling cooling coils is taken away by a compressed air condensing and circulating system, so that the main coil can be repeatedly cooled.
Example 5:
implementation of "coupling cooled tubing flexible electromagnetic forming (tubing compression) with unequal spacing flexible electromagnetic force coils and coupling cooling coils":
As shown in fig. 1 (b), a copper wire coil set (copper wires are insulated from each other, a framework inside the coil is an epoxy resin plate, and the outer surface of the copper wire coil is wrapped by a novel super strong fiber Zylon for reinforcement) which is wound into 8 turns and 10 layers is needed. The single-turn 8-layer self-closing flexible electromagnetic force coil with unequal intervals, which is wound by copper braided wires, is closely placed on the inner side surface of the main coil, the winding shape of the coil is shown in fig. 2 (b), and the shape of the coil wound by the electromagnetic force is compressed from a circular ring shape to a gear shape as shown in fig. 3 (b). An equidistant self-closing annular tubular coil wound by copper braided wires is used as a coupling cooling coil, the winding mode is 2 turns and 10 layers, the winding mode is equal to the main coil in height, and the winding mode is placed outside the main coil; the self-closing coupling cooling coils which are provided with 7 turns and are arranged at equal intervals and are woven by 2 pieces of copper are closely arranged above and below the main coil and are arranged concentrically with the main coil. The shaped tubular workpiece was placed inside the flexible electromagnetic force coil with a gap of 5mm from the flexible electromagnetic force coil. Placing the elements in a horizontal coaxial arrangement; and a high-voltage pulse power supply, a control switch and a main coil are connected in series. Turning on the control switch, discharging the main coil by the pulse power supply, and changing the state of the flexible electromagnetic force coil from an initial state 23 in fig. 4 (a), fig. 4 (b), fig. 4 (c) and fig. 4 (d) to a compressed state 24 by the interaction between the pulse current of the main coil and the induction current of the flexible electromagnetic force coil, so as to drive the flexible electromagnetic force coil to accelerate and drive the forming workpiece to finish forming; the 3 coupling cooling coils simultaneously generate the Joule heat generated by the induction current transfer main coil, so that the temperature of the main coil is reduced, and a metal condensing tube is arranged on the surface of the coupling cooling coils, and the heat of the coupling cooling coils is taken away by a compressed air condensing and circulating system, so that the main coil can be repeatedly cooled.
Example 6:
implementation of flexible electromagnetic forming (pipe compression) of coupling cooling type pipe fitting with flexible electromagnetic force coils and coupling cooling coils with different sections:
As shown in fig. 1 (b), a copper wire coil set (copper wires are insulated from each other, a framework inside the coil is an epoxy resin plate, and the outer surface of the copper wire coil is wrapped by a novel super strong fiber Zylon for reinforcement) which is wound into 8 turns and 10 layers is needed. The single-turn 8-layer self-closing flexible electromagnetic force coil with different sections, which is wound by copper braided wires, is closely placed on the inner side surface of the main coil, the winding shape of the coil is shown in fig. 2 (c), and the shape of the coil wound by the electromagnetic force is compressed from a circular ring shape to a gear shape as shown in fig. 3 (c). An equidistant self-closing annular tubular coil wound by copper braided wires is used as a coupling cooling coil, the winding mode is 2 turns and 10 layers, the winding mode is equal to the main coil in height, and the winding mode is placed outside the main coil; the self-closing coupling cooling coils which are provided with 7 turns and are arranged at equal intervals and are woven by 2 pieces of copper are closely arranged above and below the main coil and are arranged concentrically with the main coil. The shaped tubular workpiece was placed inside the flexible electromagnetic force coil with a gap of 5mm from the flexible electromagnetic force coil. Placing the elements in a horizontal coaxial arrangement; and a high-voltage pulse power supply, a control switch and a main coil are connected in series. Turning on the control switch, discharging the main coil by the pulse power supply, and changing the state of the flexible electromagnetic force coil from an initial state 23 in fig. 4 (a), fig. 4 (b), fig. 4 (c) and fig. 4 (d) to a compressed state 24 by the interaction between the pulse current of the main coil and the induction current of the flexible electromagnetic force coil, so as to drive the flexible electromagnetic force coil to accelerate and drive the forming workpiece to finish forming; the 3 coupling cooling coils simultaneously generate the Joule heat generated by the induction current transfer main coil, so that the temperature of the main coil is reduced, and a metal condensing tube is arranged on the surface of the coupling cooling coils, and the heat of the coupling cooling coils is taken away by a compressed air condensing and circulating system, so that the main coil can be repeatedly cooled.
Claims (3)
1. A flexible electromagnetic forming method of a coupling cooling type pipe fitting is characterized in that:
When the pipe fitting swells, the pipe fitting is swelled:
A flexible electromagnetic force coil (2) is arranged at the outer side of the multi-turn multi-layer main coil (1) and the inner side of the pipe fitting, and the flexible electromagnetic force coil (2) is a radial single-turn and axial multi-layer self-closing coil;
The inner side of the multi-turn multi-layer main coil (1) is provided with radial single-layer axial multi-turn coupling cooling coils with equal height;
An axial single-layer radial multi-turn coupling cooling coil is arranged at the upper part and the lower part of the multi-turn multi-layer main coil (1) in a close way; a compressed air condensing pipe (5) is arranged close to all the coupling cooling coils; the multi-turn multi-layer main coil (1), the flexible electromagnetic force coil (2), the coupling cooling coil and the pipe fitting are all arranged horizontally and coaxially;
The pipe bulging specific process comprises the following steps:
Closing a control switch (9), generating pulse current in the multi-turn multi-layer main coil (1), generating induced eddy current in the flexible electromagnetic force coil (2), and driving the flexible electromagnetic force coil (2) to accelerate by electromagnetic force between the multi-turn multi-layer main coil (1) and the flexible electromagnetic force coil (2), wherein the shape of the flexible electromagnetic force coil is gradually expanded from a gear shape to a circular shape;
The flexible electromagnetic force coil (2) drives the pipe fitting to bulge in the expanding process, so that the processing is completed;
in addition, induced current is generated in the coupling cooling coils arranged in the multi-turn multi-layer main coil (1), at the upper part and the lower part, so that part of Joule heat in the multi-turn multi-layer main coil (1) is taken away, and the temperature rise of the multi-turn multi-layer main coil (1) is reduced; meanwhile, a compressed air condensing pipe (5) arranged in the coupling cooling coil works to cool the coupling cooling coil;
When the pipe fitting is compressed:
a flexible electromagnetic force coil (2) is arranged at the inner side of the multi-turn multi-layer main coil (1) and the outer side of the pipe fitting, and the flexible electromagnetic force coil (2) is a radial single-turn and axial multi-layer self-closing coil; the radial single-layer axial multi-turn coupling cooling coils with equal height are closely arranged on the outer sides of the multi-turn multi-layer main coils (1); an axial single-layer radial multi-turn coupling cooling coil is arranged at the upper part and the lower part of the multi-turn multi-layer main coil (1) in a close way; a compressed air condensing pipe (5) is arranged close to all the coupling cooling coils; the multi-turn multi-layer main coil (1), the flexible electromagnetic force coil (2), the coupling cooling coil and the pipe fitting are all arranged horizontally and coaxially;
The specific pipe fitting compression process comprises the following steps:
Closing a control switch (9), generating pulse current in the multi-turn multi-layer main coil (1), generating induced eddy current in the flexible electromagnetic force coil (2), and driving the flexible electromagnetic force coil (2) to accelerate by electromagnetic force between the multi-turn multi-layer main coil (1) and the flexible electromagnetic force coil (2), wherein the shape of the flexible electromagnetic force coil is gradually compressed into a gear shape from a circular ring shape;
the flexible electromagnetic force coil (2) drives the pipe fitting to compress in the compression process, so as to finish the processing;
In addition, induced current is generated in the coupling cooling coils arranged outside, at the upper part and at the lower part of the multi-turn multi-layer main coil (1), so that part of Joule heat in the multi-turn multi-layer main coil (1) is taken away, and the temperature rise of the multi-turn multi-layer main coil (1) is reduced; meanwhile, a compressed air condensing pipe (5) arranged in the coupling cooling coil works to cool the coupling cooling coil.
2. The method for flexible electromagnetic forming of a coupling cooled pipe fitting according to claim 1, wherein: the coupling cooling coil is a copper bare wire.
3. The method for flexible electromagnetic forming of a coupling cooled pipe fitting according to claim 1, wherein: the coupling cooling coils are mutually insulated annular self-closing short-circuit coils.
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| CN111014419B (en) * | 2019-12-23 | 2021-02-09 | 华中科技大学 | Device for decoupling electric effect in electromagnetic forming process |
| CN112259315B (en) * | 2020-09-30 | 2022-05-17 | 重庆普尔萨科技有限公司 | Heat dissipation system for electromagnetic forming coil |
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