CN115870604A - Novel coil structure for magnetic pulse welding of plates - Google Patents
Novel coil structure for magnetic pulse welding of plates Download PDFInfo
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- CN115870604A CN115870604A CN202111134709.7A CN202111134709A CN115870604A CN 115870604 A CN115870604 A CN 115870604A CN 202111134709 A CN202111134709 A CN 202111134709A CN 115870604 A CN115870604 A CN 115870604A
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 17
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
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Abstract
The invention discloses a novel coil structure for magnetic pulse welding of plates, which comprises a multi-turn coaxial cable, an upper holding plate, a lower holding plate and a metal strip, wherein the upper holding plate is arranged on the upper end of the multi-turn coaxial cable; the upper holding plate and the lower holding plate are used for clamping the multi-turn coaxial cable, and the metal strip is arranged on the upper holding plate; the multi-turn coaxial cable comprises a core wire and a covered wire; the metal strip is in short connection with the rubber-covered wire of the multi-turn coaxial cable, and the core wire and the rubber-covered wire at the tail end of the multi-turn coaxial cable are in short connection. The invention makes the loop current on the coaxial cable circulate through the metal strips with certain length in turn and turn by short-circuiting the rubber-insulated wire of the coaxial cable on the metal strips with certain length, and assembles the high peak pulse current which is several times of the section current of the single-turn coaxial cable, thereby improving the energy utilization rate of the coil and prolonging the service life of the coil.
Description
Technical Field
The invention relates to the technical field of plate magnetic pulse welding, in particular to a novel coil structure for plate magnetic pulse welding.
Background
The Magnetic Pulse Welding (MPW) of the plates is essentially solid-phase connection, a pulse current is utilized to generate a pulse magnetic field through a coil, an induced electromagnetic force drives a flying plate, the flying plate collides with a substrate, a jet flow is generated in a collision area to scour pollutants, an oxidation layer and a thin layer of metal on the surface of the plate to be connected, and a metallurgical joint is formed under the action of impact pressure. Because the discharge current required in the magnetic pulse welding process of the plate is short in period and high in peak value, the discharge loop is required to have low enough impedance.
The plate magnetic pulse welding system mainly comprises a capacitor bank, a coil, a flying plate (connecting piece), a base plate (connected piece) and the like, as shown in figure 1, an external network alternating current is boosted by a transformer and rectified by a rectifier and then charged into the capacitor bank, when the capacitor bank is charged to a preset voltage, a discharge switch is closed, a loop is formed between a capacitor and the welding coil to generate a pulse current, electric energy stored in the capacitor bank is instantaneously discharged through a magnetic pulse welding coil, a variable magnetic field is generated around the coil, the magnetic field interacts with the flying plate to induce a secondary electromagnetic force in a direction opposite to the current direction of a primary coil in the flying plate, the flying plate is driven by repulsion between the electric energy and the magnetic pulse welding coil to generate high-speed deformation, the flying plate is accelerated to a speed of hundreds of meters per second within microsecond, the flying plate collides with the base plate, and generates a jet flow in a collision area to scour pollutants, an oxide layer and a thin-layer metal on the surface of the plate to be connected. As a result, the "clean" flighting, substrate metal is exposed to each other and under the influence of the instantaneous impact pressure, a metallurgical joint is formed. The principle of the above process is shown in fig. 2.
At present, in the magnetic pulse welding process of the plate, the common coil structure forms have three types: i-shaped, U-shaped and E-shaped as shown in fig. 3-5. Among them, the i-shaped single turn coil is widely used because of its simple structure. The three coils have simple structural forms and have the defects of low energy utilization rate, short service life of the coil and the like.
Disclosure of Invention
In order to improve the energy utilization rate of the coil and improve the service life of the coil, the invention provides a novel coil structure for magnetic pulse welding of plates.
In order to achieve the purpose, the invention provides the following scheme:
a novel coil structure for magnetic pulse welding of plates comprises a multi-turn coaxial cable, an upper holding plate, a lower holding plate and metal strips; the upper holding plate and the lower holding plate are used for clamping the multi-turn coaxial cable, and the metal strip is arranged on the upper holding plate; the multi-turn coaxial cable comprises a core wire and a covered wire; the metal strip is in short connection with the rubber-covered wire of the multi-turn coaxial cable, and the core wire and the rubber-covered wire at the tail end of the multi-turn coaxial cable are in short connection.
Optionally, the length of the metal strip is less than the length of each turn of the covered wire.
Optionally, the cross-sectional area of the metal strip is greater than the cross-sectional area of each turn of the covered wire.
Optionally, when the cross-sectional areas of the core wire and the covered wire are fixed, the smaller the ratio of the length of the metal strip to the length of each turn of covered wire is, the higher the peak current amplification factor on the metal strip is.
Optionally, the novel coil structure is directly used for magnetic pulse forming of the plate.
Optionally, the metal strip comprises a copper alloy, stainless steel, and carbon steel.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, by short-circuiting the rubber wires of the coaxial cables to the metal strips with a certain length, the loop current on the coaxial cables circularly flows through the metal strips with a certain length in turn and in turn, and the loop current is converged to generate high peak pulse current which is several times of the section current of the single-turn coaxial cables, so that the energy utilization rate of the coil can be improved, and the service life of the coil can be prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic view of a magnetic pulse welding system for dissimilar metal sheets;
FIG. 2 is a schematic view of the magnetic pulse welding principle of dissimilar metal plates;
FIG. 3 is a schematic diagram of a conventional coil type for magnetic pulse welding of a plate, (a) is an I-shaped coil, (b) is a U-shaped coil, and (c) is an E-shaped coil;
FIG. 4 is a simplified circuit diagram of a five turn coaxial cable coil;
FIG. 5 is a graph of the discharge current for a 7 turn coaxial cable coil; (a) is a positive triaxial side view and (b) is a top view;
fig. 6 is a discharge current curve (peak current magnification is 5.3 times) for a 7-turn coaxial cable coil;
FIG. 7 is a schematic structural view of a 7-turn coaxial cable coil fixture;
fig. 8 is a discharge current graph of a 2-turn parallel coaxial cable coil (peak current magnification is 3.8 times);
FIG. 9 is a diagram of the effect of the magnetic pulse welded joint; wherein (a) is before connection and (b) is after connection.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to improve the energy utilization rate of the coil and improve the service life of the coil, the invention provides a novel coil structure for magnetic pulse welding of plates.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 4-5, a novel coil structure for magnetic pulse welding of plates comprises a multi-turn coaxial cable, an upper holding plate, a lower holding plate and a metal strip. The high-strength metal strip conductor mainly comprises copper alloy, stainless steel, carbon steel and the like. The coil welding segment belongs to a part of the short-circuit copper strip. The metal strip is arranged on the upper holding plate; the multi-turn coaxial cable comprises a core wire and a covered wire; the upper and lower clamping plates short-circuit the flex of the multi-turn coaxial cable to a length of metal strip (the coil-welding segment in fig. 5). The core wire and the rubber-insulated wire at the tail end of the multi-turn coaxial cable are in short circuit, and current flows in from the core wire at the other end of the coaxial cable and flows out from the rubber-insulated wire. The loop current on the multi-turn coaxial cable circularly flows through the copper bar convergence section in turn and in turn, and is converged to generate high peak pulse current which is several times of the section current of the single-turn coaxial cable.
The coil structure of the invention can be directly used for the magnetic pulse forming of the plate besides being used for the magnetic pulse welding of the plate.
Through the special coil loop, the discharge current sequentially and circularly passes through a section of conductor, high peak value pulse current is generated by convergence, and the energy utilization rate of the coil is improved. The simplified circuit diagram of the 5-turn coaxial cable coil is shown in fig. 4, the peak value of the current of the conductor section is multiple times of the peak value of the current of the main circuit, and the theoretical current amplification factor is equal to the circulating passing times. Meanwhile, except the conductor sections for welding, other loops in the coil are connected through coaxial cables to form the coil, so that the inductance value of the coil is maintained at a small value, and the period and the peak current of a discharge current curve generated by the discharge loop meet the plate magnetic pulse welding condition. Therefore, the invention provides a novel coil structure for magnetic pulse welding of plates, which superposes and amplifies pulse current through a discharge loop and generates the effect of high-peak pulse current under given discharge energy.
Based on the above invention concept, the rubber-insulated wire of the coaxial cable is short-circuited on a metal strip (belonging to a conductor section for coil welding) with a certain length, so that the loop current on the coaxial cable flows through the metal strip with a certain length sequentially and circularly in turns, and high peak pulse current which is several times of the section current of the single-turn coaxial cable is generated by convergence, and the schematic diagram of the coil structure is shown in fig. 5. Because the current in the coaxial cable coil circularly flows on the short-circuited metal strip in sequence in turns, the peak current is not the superposition of the peak current on the single-turn coaxial cable, but the staggered peak superposition is formed according to the loop; meanwhile, the loop resistance of the coil is increased, so that the discharge current is attenuated to a certain degree. Therefore, the peak current amplification on the metal strip is smaller than the number of turns, and the discharge current curve (peak current amplification is 5.3 times) of the 7-turn coaxial cable coil is shown in fig. 6.
In the coaxial cable coil, the formation of a loop is particularly critical, and in order to ensure that the loop is carried out according to a design scheme, the length of a metal strip needs to be ensured to be smaller than the length of each turn of a rubber-covered wire of a coaxial cable or the sectional area of the metal strip needs to be larger than the sectional area of each turn of the rubber-covered wire of the coaxial cable coil. The theoretical basis is that the resistance of the metal strip is smaller than that of each turn of the rubber-covered wire of the coaxial cable coil, and then the current preferentially flows through the metal strip and is sequentially and circularly converged to generate large current, so that the amplification of the discharge current peak value is realized.
Experimental research shows that the peak current amplification factor beta on the metal strip is closely related to the length l of the rubber-covered wire of each turn of the coaxial cable coil and the length l of the metal strip, and the ratio l of the length of the metal strip to the length of the rubber-covered wire of each turn of the coaxial cable is found under the condition that the sectional areas of the core wire and the rubber-covered wire of the coaxial cable are certain Guide tube /l Leather The smaller the amplification efficiency β, the higher.
Amplification efficiency
Wherein n is a To the actual magnification, n t Is the number of coil turns.
In addition, through the verification of numerical simulation and experimental study, the conclusion is drawn that: the peak current amplification efficiency of the parallel coaxial cable coil is higher than that of the non-parallel coaxial cable coil. The parallel connection means that core wires of 2 turns or more than 2 turns of coaxial cables are connected in parallel, covered wires are connected in parallel to form a positive electrode and a negative electrode which are connected with the equipment end, the 2 turns or more than 2 turns of coaxial cables are connected in parallel to form a strand which simultaneously passes through a copper strip section, and a discharge current curve (the amplification factor of peak current is 3.8 times) of a 2-turn parallel connection type coaxial cable coil with 4 turns is shown in figure 8. Taking different types of coaxial cable coils as examples, the amplification efficiency of a 2-turn parallel type coaxial cable coil with 4 turns is 3.8/4=95%, the amplification efficiency of a 5-turn coaxial cable coil is 3.8/5=76%, and the amplification efficiency of a 7-turn coaxial cable coil is 5.3/7=76%.
The following detailed description of embodiments is made with reference to fig. 5 and 7:
(1) N-turn coils were designed and modeled, sized and configured according to the initial parameters, as shown in fig. 5.
(2) And (4) performing simulation based on numerical simulation software, and determining the inductance, the resistance value, the discharge current curve and the peak value (amplification factor) of the generated pulse current of the coaxial cable coil.
(3) And (3) iteratively optimizing the structure and the size of the coil according to the numerical simulation result to determine the number of turns, the height and the length of the coaxial cable, and designing a tool part of the coaxial cable coil, wherein the tool comprises the coaxial cable coil, a supporting cylinder, a working table plate, a left supporting plate, a right supporting plate, a limiting strip, a limiting block and the like, as shown in fig. 7. Wherein the supporting cylinder, the left supporting plate and the right supporting plate are used for fixing and limiting the coaxial cable coil; the limiting strips are used for clamping two sides of the coil to prevent the coil from being stressed and shifting during working; the workbench plate is used for providing a placing space for the to-be-connected pieces (the flying plate and the base plate); the limiting block is used for adjusting the lap joint gap between the flying plate and the substrate.
(4) The length of the coaxial cable is determined, and the coaxial cable is wound into a spiral coil according to a design scheme.
(5) The method comprises the steps of determining a short-circuit position of a covered wire and the length of a stripped wire in a coaxial cable coil, and then using a customized copper block to short the covered wire of each turn to an intermediate copper strip section (namely a current convergence section or a welding section).
(6) And processing the tail position of the coaxial cable coil, and short-circuiting the core wire and the rubber wire of the coaxial cable.
(7) And processing the position of the coil head of the coaxial cable, and taking a core wire and a rubber-insulated wire of the coaxial cable as a positive electrode and a negative electrode of the coil so as to be connected with an interface of electromagnetic forming equipment to form a loop.
(8) And assembling the coil, and then measuring a discharge current curve of a single turn of the coaxial cable coil and a discharge current curve of a copper bar convergence section (see figure 5), namely a coil welding section, by using the Rogowski coil to determine the actual amplification factor and the amplification efficiency of the pulse current.
The first embodiment is as follows:
magnetic pulse welding based on a novel coil was performed on AA1060 aluminum sheet-DP 600 steel sheet. Wherein, the connected plate is a DP600 steel plate with the thickness of 1mm. The connection plate is an AA1060 aluminum plate, and the thickness of the connection plate is 0.5mm, 1.0mm, 1.5mm and 2.0mm respectively. Both dimensions in plane are 40mm x 80mm. The axial stopper thickness is 2mm, and connecting plate and by connecting plate joining region axial clearance 2mm promptly, stopper width is 15mm to the interval. When adopting single stopper, stopper thickness is 2mm, and the stopper is apart from flying board free end 10mm.
The DP600 steel plate and the AA1060 aluminum plate are polished by abrasive cloth to remove rust until new metal surfaces appear. And then, cleaning the surface of the steel plate by using high-purity industrial alcohol (the mass fraction of ethanol is 99.7 percent), removing impurities, and then drying the steel plate by blowing. To ensure the surface quality of the sample, the prepared sample was connected within 30 minutes.
The rated voltage of the magnetic pulse welding device is 20kV, the capacitance is 100 muF, the adjustable voltage range is 3-20 kV, and the maximum discharge energy is 20kJ.
Based on the above experimental conditions, a connection joint of DP600-AA1060 (δ =0.5 mm) was obtained under a discharge voltage of 11 kV; under the condition of 12kV of discharge voltage, a connection joint of DP600-AA1060 (delta =1.0 mm) is obtained; under the condition of 12kV of discharge voltage, a connection joint of DP600-AA1060 (delta =1.5 mm) is obtained; under the condition of the discharge voltage of 14kV, a DP600-AA1060 (delta =2.0 mm) connecting joint is obtained, and a joint connecting effect graph is shown in figure 9.
In conclusion, the connection of AA1060 aluminum plate and DP600 steel plate with the thickness of 0.5mm, 1.0mm, 1.5mm and 2.0mm respectively is realized under the condition that the highest discharge energy is not more than 9.8 kJ.
Example two:
magnetic pulse welding based on a novel coil is carried out on an AA6101 high-strength aluminum alloy plate-DP 600 steel plate. Wherein, the connected plate is a DP600 steel plate with the thickness of 1mm. The connecting plate is an AA6101 high-strength aluminum alloy plate, and the thickness is 0.8mm. Both dimensions in plane are 40mm x 80mm. The thickness of the limiting blocks is 2mm, and the distance between the limiting blocks is 15mm.
And polishing and derusting the DP600 steel plate and the AA6101 high-strength aluminum alloy plate by using abrasive cloth until new metal surfaces appear. Then, high-purity industrial alcohol (ethanol mass fraction is 99.7%) is used for surface cleaning, impurities are removed, and then the surface is dried. To ensure the surface quality of the samples, the prepared samples were connected within 30 minutes.
The rated voltage of the magnetic pulse welding device is 20kV, the capacitance is 100 muF, the adjustable voltage range is 3-20 kV, and the maximum discharge energy is 20kJ.
Based on the experimental conditions, the AA6101-DP600 connection joint is obtained under the condition of 15kV discharge voltage, and the joint connection effect graph is shown in figure 9. Namely, under the condition that the highest discharge energy is not more than 11.3kJ, the connection between the AA6101 high-strength aluminum alloy plate and the DP600 steel plate is realized, and the feasibility of the novel coil and the effective improvement of the energy utilization rate of the coil are further verified.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A novel coil structure for magnetic pulse welding of plates is characterized by comprising a multi-turn coaxial cable, an upper holding plate, a lower holding plate and a metal strip; the upper holding plate and the lower holding plate are used for clamping the multi-turn coaxial cable, and the metal strip is arranged on the upper holding plate; the multi-turn coaxial cable comprises a core wire and a covered wire; the metal strip is in short connection with the rubber-insulated wire of the multi-turn coaxial cable, and the core wire and the rubber-insulated wire at the tail end of the multi-turn coaxial cable are in short connection.
2. The novel coil structure for magnetic pulse welding of sheet material as claimed in claim 1, wherein the length of said metal strip is less than the length of each turn of covered wire.
3. The novel coil structure for magnetic pulse welding of sheet material as claimed in claim 1, wherein said metal strip has a cross-sectional area greater than the cross-sectional area of each turn of covered wire.
4. The novel coil structure for magnetic pulse welding of sheet material as claimed in claim 1, wherein the smaller the ratio of the length of said metal strip to the length of each turn of said covered wire, the higher the peak current amplification on said metal strip, at a given cross-sectional area of said core wire and said covered wire.
5. The novel coil structure for magnetic pulse welding of sheet material as claimed in claim 1, wherein said novel coil structure is used directly for magnetic pulse forming of sheet material.
6. The novel coil structure for magnetic pulse welding of sheet material as defined in claim 1 wherein said metal strip includes copper alloy, stainless steel and carbon steel.
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| CN109935435A (en) * | 2019-03-29 | 2019-06-25 | 重庆大学 | Multiturn E font coil applied to electromagnetic pulse plate forming |
| CN110026670A (en) * | 2019-05-16 | 2019-07-19 | 福州大学 | Dissimilar metal plate collection magnetic-control power formula magnetic field impulse attachment device and its working method |
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2021
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|---|---|---|---|---|
| CN1117669A (en) * | 1994-08-24 | 1996-02-28 | 牡丹江市光电技术研究所 | Multi-path synchronous magnetic pulse generator |
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