CN214053295U - Electromagnetic step-by-step forming device based on three coils - Google Patents
Electromagnetic step-by-step forming device based on three coils Download PDFInfo
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- CN214053295U CN214053295U CN202022654522.7U CN202022654522U CN214053295U CN 214053295 U CN214053295 U CN 214053295U CN 202022654522 U CN202022654522 U CN 202022654522U CN 214053295 U CN214053295 U CN 214053295U
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Abstract
The utility model discloses an electromagnetism substep forming device based on three coils has solved current suction type pipe fitting processing pipe fitting bulging inhomogeneous, and the mould is difficult to place the scheduling problem. The accessible substep is formed and is improved the pipe fitting and warp the degree of consistency, carries out secondary operation with pipe fitting processing least uniform region, makes the pipe fitting take shape more evenly, and need not the mould, has bypassed the difficult problem of placing of suction force formula pipe fitting bulging mould.
Description
Technical Field
The utility model belongs to the metal takes shape and makes the field, in particular to electromagnetism substep forming device based on three coils, the quick even forming processing of mainly used metal pipe fitting.
Background
At present, a large number of metal pipe fittings are applied to the fields of automobiles, aerospace and the like so as to meet the requirements of industries for light weight. The pipe fittings made of light alloys such as aluminum and magnesium are the leading edge and hot spot of development, the common pipe fitting electromagnetic processing technology, such as repulsive force pipe fitting bulging, attractive force pipe fitting bulging and the like, has a great number of defects, and the pipe fittings are often bulged and uneven in actual production and processing. Therefore, a method for processing a pipe with more uniform expansion is needed.
The existing pipe expansion technology, namely rolling, stamping, and traditional repulsion type or attraction type electromagnetic forming, has the following defects: 1. the traditional methods such as rolling, stamping, forging and the like have complicated working procedures, and the strain rate of materials in the processing process is low, particularly for light alloys such as aluminum, magnesium and the like, the forming limit is low under the low strain rate, and the processing modes can easily cause that parts are broken when the parts do not reach the target shape; meanwhile, the rebound of the part after being unloaded from the cold stamping die is large, the dent resistance of the component is low, the phenomena of distortion, deformation, wrinkling and the like are easily generated, the precision is difficult to control, and the subsequent processing is also influenced. 2. Although the traditional pipe fitting bulging technology can improve the forming limit of aluminum alloy, the deformation of the pipe fitting is not uniform due to the uneven distribution of the Lorentz force, and the pipe fitting is convex.
Meanwhile, the distribution of Lorentz force is not uniform no matter the traditional pipe fitting bulging mode is based on repulsive force or attractive force, so that the pipe fitting bulging is not uniform, and the bulging depth of the pipe fitting position corresponding to the center of the coil is usually the largest. The pipe fitting bulging based on the repulsive force can be more uniform by additionally arranging a die on the outside of the pipe fitting, but the position relation between the coil and the pipe fitting based on the attractive pipe fitting bulging device makes the method difficult to additionally arrange the die, so that the attractive pipe fitting bulging is very difficult to improve the bulging uniformity.
Suction pipe bulging patents such as: patent CN109622721A, an electromagnetic forming force regulating device and method for metal pipe fittings, the device includes a driving magnetic field coil, an auxiliary magnetic field coil and a single power supply regulating circuit. The two groups of coils are regulated and controlled by a single power supply, the driving magnetic field coil is used for generating induced eddy currents in the tube, the auxiliary magnetic field coil is used for generating a background magnetic field, and the induced eddy currents and the background magnetic field interact to generate attraction force to drive the tube to be formed; the method reduces the cost of the double-coil electromagnetic forming of the metal pipe fitting and solves the problem of time sequence control. But the radial electromagnetic force generated by the method is unreasonable, so that the pipe fitting is deformed unevenly. The utility model discloses utilize the substep to take shape and provide reasonable radial electromagnetic force for the pipe fitting, bypass the problem that attractive pipe fitting bulging die is difficult to place, need not the degree of consistency that the improvement pipe fitting that the mould can be very big warp.
SUMMERY OF THE UTILITY MODEL
To the above defect or the improvement demand of prior art, the utility model provides an electromagnetism substep forming device based on three coils has solved current suction type pipe fitting processing pipe fitting bulging inhomogeneous, and the mould is difficult to place the scheduling problem. The accessible substep is formed and is improved the pipe fitting and warp the degree of consistency, carries out secondary operation with pipe fitting processing least uniform region, makes the pipe fitting take shape more evenly, and need not the mould, has bypassed the difficult problem of placing of suction force formula pipe fitting bulging mould.
To achieve the above object, according to an aspect of the present invention, there is provided a three-coil-based electromagnetic step-by-step forming device, comprising a pipe fitting, three groups of forming coils: the device comprises a first group of coils 1, a second group of coils 2, a third group of coils 3, a long pulse width power supply, a short pulse width power supply and a secondary processing power supply, wherein the three groups of coils are all placed on the outer side of the pipe fitting, the long pulse width power supply is used for introducing long pulse width pulse current into the first group of coils 1 to generate a background magnetic field, the second group of coils 2 and the third group of coils 3 are connected in parallel, and the short pulse width current is introduced respectively to induce eddy current on the pipe fitting and provide controllable Lorentz force for the pipe fitting so as to enable the pipe fitting to be expanded by attraction; and the third group of coils 3 supplies power to the secondary processing power supply after the bulging is finished, and secondary processing is carried out on the areas with the most uneven bulging of the pipe fittings to enable the bulging of the pipe fittings to be even.
Preferably, a capacitor power supply system with high-precision thyristors is adopted to respectively supply the three groups of coils with long pulse width current, short pulse width current and secondary machining current.
According to another aspect of the present invention, there is provided a three-coil-based electromagnetic step-by-step forming method, specifically comprising the steps of:
step 1: selecting an alloy pipe fitting meeting the required production specification, and carrying out annealing pretreatment operation;
step 2: manufacturing a coil framework according to the geometric shape of a coil, winding the coil framework into a formed coil by using a winding machine, covering interlayer insulating materials between layers, welding a copper bar electrode after the coil is wound, and reinforcing the periphery by using high-strength fibers;
and step 3: fixing the forming coil and the pipe fitting by using hydraulic equipment;
and 4, step 4: selecting a proper number of capacitors according to the material and thickness of the pipe fitting and the discharge energy required by forming, and assembling and connecting the three groups of capacitor bank pulse power generation devices according to the working procedures;
and 5: the long pulse width current generating device selects a capacitor bank with larger total capacity, the short pulse width current generating device selects a capacitor bank with smaller total capacity, and the secondary processing current generating device also selects a capacitor bank with smaller total capacity;
step 6: the three groups of power supply devices are remotely controlled through a computer; the first group of coils generates a background magnetic field in the forming area under the action of long pulse width pulse current; the second three groups of coils are firstly connected in parallel to run under the action of short pulse width pulse current, and when the long pulse width current reaches the peak value quickly, the short pulse width current is conducted, so that the pipe fitting is expanded by the attraction force;
and 7: and after the bulging is finished, the third group of coils are introduced with secondary processing current to carry out secondary processing on the most uneven bulging area of the pipe fitting, so that the pipe fitting is even in bulging.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
1. three groups of coils which can be changed according to the forming requirement of the workpiece are generated to enable the pipe fitting to be expanded step by step, the eddy current and the magnetic field can be flexibly regulated and controlled by adjusting the discharge voltage and the capacitance value of the capacitor in the three groups of power supply devices, and more flexible Lorentz force loading is realized.
2. The utility model realizes that a group of position coils generate induced eddy currents in the most uneven deformation area of the pipe fitting, and the bulging uniformity of the pipe fittings of different materials and thicknesses can be improved by changing the power supply parameters in the secondary processing power supply device;
3. the method provided by the utility model not only reduces the production cost and the production period, but also improves the forming quality of the workpiece.
4. The utility model discloses the mould need not to use the mould can improve the degree of consistency of pipe fitting bulging, has bypassed the difficult problem of placing of attractive formula pipe fitting bulging mould.
Drawings
FIG. 1 is a schematic view showing the entire connection of a step-by-step forming apparatus.
FIG. 2 is a schematic power supply load for the step-processing forming apparatus.
FIG. 3 is a schematic diagram of a step processing circuit
Fig. 4 shows the waveforms of the pulse currents applied to the three groups of coils.
FIG. 5 is a graph showing the effect of improving uniformity.
1. A first set of coils; 2. a second set of coils; 3. a third set of coils; 4. a pipe fitting; 5. a long pulse width power supply; 6. a short pulse width power supply; 7. and (5) secondary processing power supply.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
A electromagnetism substep forming device based on three coils, all place in the pipe fitting outside through setting up three group's coils, and can take shape according to the work piece and require arbitrary change position. Wherein the first group of coils 1 mainly generate a background magnetic field under the time sequence regulation of the long pulse width pulse current. The second three groups of coils are firstly connected in parallel and operated under the time sequence regulation of short pulse width current, so that the pipe fitting 4 is expanded by the attraction force. After the pipe fitting bulging is finished, the third group of coils 3 are electrified with secondary processing current to carry out secondary processing on the most uneven deformation area of the pipe fitting 4, so that the pipe fitting 4 is even in bulging. The positional relationship of the coil and the pipe is shown in fig. 1.
The utility model discloses according to the left-hand rule, at first through the background magnetic field that a set of coil produced, two sets of coil parallel operation produce the induction vortex in the pipe fitting in addition, according to the lenz law under the influence each other of induction vortex in axial component in background magnetic field and pipe fitting 4, the pipe fitting will receive radial appeal bulging. After the bulging is finished, the secondary processing current is introduced into the third group of coils 3, according to the Lenz law, a magnetic field generated by the secondary processing current interacts with eddy currents generated in the pipe fitting, and the pipe fitting 4 is subjected to inward repulsive force through an area with the most uneven attractive bulging.
The electromagnetic step-by-step forming method based on the three coils comprises the following specific implementation steps:
step 1: selecting an alloy pipe fitting meeting the required production specification, and carrying out annealing pretreatment operation;
step 2: manufacturing a coil framework shown in figure 2 according to the geometric shape of a coil, winding the coil by using a winding machine to form the coil, covering interlayer insulating materials between layers, welding a copper bar electrode after the coil is wound, and finally performing peripheral reinforcement by using high-strength fibers;
and step 3: fixing the formed coils and the pipe fittings according to the arrangement sequence of the figure 1 by using hydraulic equipment, wherein the pressure is generally set to be 1-1.5 MPa;
and 4, step 4: as shown in fig. 1, a proper number of capacitors are selected according to the material and thickness of the pipe and the discharge energy required by forming, and three groups of capacitor bank pulse power generation devices are assembled and connected according to the process;
and 5: the utility model has the advantages that the middle-long pulse width power supply 5 selects the capacitor bank with larger total capacity, the short pulse width power supply 6 selects the capacitor bank with smaller total capacity, and the secondary processing power supply 7 also selects the capacitor bank with smaller total capacity;
step 6: the three groups of power supply devices are remotely controlled through a computer; 3-5, the first group of coils 1 generates a background magnetic field in the forming area under the action of the long pulse width pulse current; the second coil 2 and the third group of coils 3 are firstly connected in parallel to operate under the action of short pulse width pulse current (when the long pulse width current reaches the peak value quickly, the short pulse width current is conducted), so that the pipe fitting 4 is expanded by the attraction force.
And 7: after the bulging is finished, the third group of coils 3 are electrified with secondary processing current to carry out secondary processing on the most uneven bulging area of the pipe fitting, so that the pipe fitting is even in bulging.
And 8: and finally, comparing the forming effect.
The utility model discloses in related many physical field analysis computational formula as follows:
in the formula, FzAnd FrAxial lorentz forces and radial lorentz forces, respectively; j. the design is a squareeSetting the clockwise direction as the positive direction for the density of the induced eddy current on the pipe fitting; b isrAnd BzB is defined as an axial magnetic field component and a radial magnetic field component, respectivelyrThe pointing center is the positive direction;
and
the induced eddy currents formed on the pipe fitting 4 by the long pulse width current, the short pulse width current and the secondary processing current are respectively; b isZ-l，BZ-sAnd BZ-TThe axial magnetic fields generated in the forming area by the long pulse width current, the short pulse width current and the secondary forming current respectively; t represents time, t1The time when the long pulse width current reaches the peak value, t2The moment of finishing the attractive bulging; i islongFor applying current values to the long-pulse-width current coils, IshortThe current value of the coil is switched on by the short-pulse width current.
The utility model takes the pipe bulging as an example for analysis, and is verified through theory and simulation; the utility model provides a realize device of above-mentioned method, mainly including three group's forming coil, three group's coils are all placed in the pipe fitting outside, and wherein 1 first group coil lets in long pulse width pulse current and produces background magnetic field. The second group of coils 2 and the third group of coils 3 are firstly connected in parallel to operate and are introduced with short pulse width current to mainly induce eddy current on the pipe fitting, controllable Lorentz force is provided for the pipe fitting to enable the pipe fitting to be expanded by attraction, the third group of coils 3 are supplied with power by a secondary processing power supply 7 after the expansion is finished, and secondary processing is carried out on the area with the most uneven expansion of the pipe fitting to enable the expansion of the pipe fitting to be even. And three groups of capacitor power supply systems with thyristors with higher precision are provided for respectively providing long pulse width current, short pulse width current and secondary processing current for the three groups of coils. The utility model discloses an even bulging of appeal formula pipe fitting bulging can satisfy multiple processing demand, richenes the processing method of aluminum alloy pipe fitting. The utility model discloses can greatly promote the pipe fitting bulging degree of consistency based on appeal, satisfy the demand of fields such as car, aerospace to the extensive volume production of pipe fitting.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (2)
1. The electromagnetic step-by-step forming device based on the three coils is characterized by comprising a pipe fitting, three groups of forming coils: the device comprises a first group of coils, a second group of coils, a third group of coils, a long pulse width power supply, a short pulse width power supply and a secondary processing power supply, wherein the three groups of coils are all placed on the outer side of the pipe fitting, the long pulse width power supply is used for generating a background magnetic field when the first group of coils (1) are connected with the long pulse width power supply, the second group of coils and the third group of coils are connected in parallel, and the short pulse width power supply is respectively connected with the second group of coils and the third group of coils to induce eddy currents on the pipe fitting and provide controllable Lorentz force for the pipe fitting so that the pipe fitting is expanded by attraction; and the third group of coils supplies power to the secondary processing power supply after the bulging is finished, and secondary processing is carried out on the area with the most uneven bulging of the pipe fitting so that the bulging of the pipe fitting is even.
2. The three-coil based electromagnetic step-forming apparatus as claimed in claim 1, wherein a capacitor power supply system having high-precision thyristors is used to supply the long pulse width current, the short pulse width current and the secondary machining current to the three groups of coils, respectively.
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| CN202022654522.7U CN214053295U (en) | 2020-11-16 | 2020-11-16 | Electromagnetic step-by-step forming device based on three coils |
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| CN202022654522.7U CN214053295U (en) | 2020-11-16 | 2020-11-16 | Electromagnetic step-by-step forming device based on three coils |
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