CN111659785A - Multi-energy field composite punch-head-free rivet-free connecting device and method - Google Patents
Multi-energy field composite punch-head-free rivet-free connecting device and method Download PDFInfo
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- CN111659785A CN111659785A CN202010533578.9A CN202010533578A CN111659785A CN 111659785 A CN111659785 A CN 111659785A CN 202010533578 A CN202010533578 A CN 202010533578A CN 111659785 A CN111659785 A CN 111659785A
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- upper die
- metal plate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/14—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces applying magnetic forces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
- B21D39/031—Joining superposed plates by locally deforming without slitting or piercing
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- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention provides a punch-head-free rivet-free connecting device and method for multi-energy field compounding, which comprises the following steps: the die comprises a female die, wherein an annular cavity is arranged in the female die, grooves are formed in an outer ring and an inner ring at the lower part of the annular cavity, a conical protrusion is arranged in the middle of the female die, and a first metal plate and a second metal plate are arranged at the top of the female die; the blank holder, the blank holder is the cyclic annular setting and is in second sheet metal top, the embedded blank holder coil that is the annular that is equipped with of blank holder. According to the punch-free head-free rivet-free connecting device and method for multi-energy field compounding, a punch is not needed, two annular mechanical lock structures with four welding spots are manufactured through the combined action of multiple fields and the organic unification of a magnetic field, an electric field and a plastic mechanical field, the microstructure is improved, the material flow in the rivet-free connecting process is improved, the stress concentration of the rivet-free head and neck is reduced, the mechanical property of a joint is obviously improved, the reliability is high, the efficiency is high, and the operation is simple.
Description
Technical Field
The invention relates to the technical field of plate connection, in particular to a punch-head-free rivet-free connecting device and method for multi-energy field compounding.
Background
In recent years, with the development of the fields of aerospace, transportation, electronics and the like, light materials and light structures are widely regarded, and the rivetless connection is more and more popular as a connection process which can effectively connect the light materials without adding an auxiliary connecting piece.
The traditional rivet-free connection process utilizes a specially-made punch and a lower die to punch the same or different materials, so that the materials are hooked with each other and connected together, although the rivet-free connection process is low in cost, low in energy consumption and free of harmful gas, in the process of punching, the punch gradually generates abrasion phenomena along with the increase of punching times, when the abrasion of the punch reaches a certain degree, the strength and the size precision of a processing joint can be seriously influenced, and when the punching force is large, repeated punching is carried out, the punch is easy to break, so that the manufacture of the rivet-free connection can be seriously adversely influenced.
Disclosure of Invention
The invention provides a punch-free rivet-free connecting device and method with multiple energy fields, and aims to solve the problems that a punch is required to be used for rivet-free connection, the punch is worn after being used for multiple times, the strength and the dimensional precision of a machined joint are affected when the punch is worn to a certain degree, the strength of a rivet-free connecting structure is not high, the stress state of the joint is unreasonable, the neck of the joint is concentrated in stress, and the defect of pulling crack exists.
In order to achieve the above object, an embodiment of the present invention provides a punch-less rivetless connecting device for multi-energy field compounding, including:
the die comprises a female die, wherein an annular cavity is arranged in the female die, grooves are formed in an outer ring and an inner ring at the lower part of the annular cavity, a conical protrusion is arranged in the middle of the female die, and a first metal plate and a second metal plate are arranged at the top of the female die;
the blank holder is annularly arranged above the second metal plate, and an annular blank holder coil is embedded in the blank holder;
the upper die is arranged above the female die and moves in the vertical direction, the lower part of the upper die is cylindrical, and a cylindrical hole is formed in the center of the lower part of the upper die;
the controller is arranged at the top of the upper die;
the upper die electromagnetic module is integrated on a circuit board of the controller, electrically connected with the first end of the controller and comprises a plurality of upper die electromagnetic loops;
the blank holder electromagnetic circuit is integrated on the circuit board of the controller and is electrically connected with the second end of the controller.
Wherein, the die includes:
the first lower electrode is arranged at the edge of the annular cavity at the first side of the female die;
the second lower electrode is arranged on the edge, close to the annular cavity, of the first side in the conical bulge;
the third lower electrode is arranged on the edge, close to the annular cavity, of the second side in the conical bulge;
the fourth lower electrode is arranged at the edge of the annular cavity at the second side of the female die;
the first transformer is arranged on the first side of the female die, the first end of the first transformer is electrically connected with the third end of the controller, the second end of the first transformer is electrically connected with the first lower electrode, and the third end of the first transformer is electrically connected with the second lower electrode;
the second transformer is installed on the second side of the concave die, the first end of the second transformer is electrically connected with the fourth end of the controller, the second end of the second transformer is electrically connected with the third lower electrode, and the third end of the second transformer is electrically connected with the fourth lower electrode.
Wherein, go up the mould and include:
the upper die coils are annularly embedded in the upper die, a plurality of upper die coils are arranged, and each upper die coil corresponds to one upper die electromagnetic circuit;
the first upper electrode is arranged on the first outer side of the lower part of the upper die and is electrically connected with the fourth end of the first transformer;
a second upper electrode mounted on a first inner side of a lower portion of the upper die, the second upper electrode being electrically connected to a fifth terminal of the first transformer;
a third upper electrode mounted on a second inner side of the lower portion of the upper die, the third upper electrode being electrically connected to a fourth end of the second transformer;
and the fourth upper electrode is arranged on the second outer side of the lower part of the upper die and is electrically connected with the fifth end of the second transformer.
Wherein each said upper die electromagnetic circuit comprises:
a first switch, a first end of which is electrically connected with a first end of the corresponding upper die coil;
a first end of the first capacitor is electrically connected with a second end of the first switch;
a first end of the first inductor is electrically connected with a second end of the first capacitor;
and a first end of the first resistor is electrically connected with a second end of the first inductor, and a second end of the first resistor is electrically connected with a corresponding second end of the upper die coil.
Wherein, blank holder electromagnetic circuit includes:
a first end of the second switch is electrically connected with a first end of the blank holder coil;
a second capacitor, a first end of the second capacitor being electrically connected to a second end of the second switch;
a first end of the second inductor is electrically connected with a second end of the second capacitor;
and a first end of the second resistor is electrically connected with a second end of the second inductor, and a second end of the second resistor is electrically connected with a second end of the blank holder coil.
Wherein the first lower electrode, the second lower electrode, the third lower electrode, and the fourth lower electrode are provided in a fan shape.
The sections of the coils in the blank holder coil and each upper die coil are spiral tube coils formed by winding round or rectangular red copper wires.
The embodiment of the invention also provides a punch-head-free rivet-free connecting method for multi-energy field compounding, which comprises the following steps:
step 1, stacking a first metal plate and a second metal plate on the top of a female die;
step 2, charging a first capacitor in each upper die electromagnetic loop and a second capacitor in each blank holder electromagnetic loop by a controller, and stopping charging after each first capacitor and each second capacitor reach specified voltage;
and 5, finishing discharging of a first capacitor in each upper die electromagnetic loop and a second capacitor in the blank holder electromagnetic loop, automatically opening a first switch in each upper die electromagnetic loop and a second switch in the blank holder electromagnetic loop, losing power of each upper die coil and the blank holder coil, descending the upper die to a preset position to stop advancing, enabling a fourth upper electrode to be opposite to and in contact with a neck without a rivet joint, communicating the first upper electrode with a first lower electrode, communicating the second upper electrode with a second lower electrode, communicating the third upper electrode with a third lower electrode, communicating the fourth upper electrode with a fourth lower electrode, forming four welding points between the upper electrode and the lower electrode in a pairwise correspondence manner to obtain a composite structure of an inner ring and an outer ring mechanical lock with the four welding points, finishing machining of the first metal plate and the second metal plate, and returning the upper die to an original position.
The scheme of the invention has the following beneficial effects:
according to the punch-less rivetless connecting device and method for multi-energy field compounding, provided by the embodiment of the invention, a punch is not needed, a metal plate is automatically formed under the action of a magnetic field force by utilizing electromagnetic pulses, a forming tool is not contacted with an upper metal plate in the forming process, the generation of abrasion and fracture of the traditional rivetless connecting punch is avoided, the magnetic field, the electric field and the plastic mechanical field are organically unified, two annular mechanical locking structures with four welding spots are manufactured, the microscopic structure is improved under the combined action of multiple fields, the device and method are effectively used for producing a high-strength rivetless connecting joint, the plate flowing in the rivetless connecting process is improved, the pulling crack defect in the traditional rivetless connecting process is overcome, the stress concentration of the rivetless head and neck part is reduced, the mechanical property of the joint is obviously improved, the reliability is high, the efficiency is higher, and the operation is simple.
Drawings
FIG. 1 is a schematic diagram of the general structure of the present invention;
FIG. 2 is a specific circuit diagram of each upper mold electromagnetic circuit of the present invention
FIG. 3 is a schematic top view of a lower electrode of the present invention;
FIG. 4 is a three-dimensional schematic view of a lower electrode of the present invention;
FIG. 5 is a schematic view of a female mold of the present invention;
FIG. 6 is a top view of the female mold of the present invention;
FIG. 7 is a positioning diagram of the present invention;
FIG. 8 is a schematic view of an electromagnetic pulse rivetless connection of the present invention;
FIG. 9 is a three-dimensional cross-sectional view of a joint of the present invention;
FIG. 10 is a schematic view of a resistance weld rivetless connection of the present invention;
FIG. 11 is a cross-sectional view of a composite joint of the present invention.
[ description of reference ]
1-a female die; 2-a first metal sheet; 3-a second metal sheet; 4-blank holder; 5-blank holder coil; 6, upper die; 7-a controller; 8-upper die electromagnetic module; 9-blank holder electromagnetic loop; 10-a first lower electrode; 11-a second lower electrode; 12-a third lower electrode; 13-a fourth lower electrode; 14-a first transformer; 15-a second transformer; 16-an upper die coil; 17-a fourth upper electrode; 18-a first switch; 19-a first capacitance; 20-a first inductance; 21-a first resistance; 22-welding points; 23-mechanical lock.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a multi-energy field composite punch-free rivet-free connecting device and method, aiming at the problems that a punch is needed to be used in the existing rivet-free connection, the punch is worn after being used for multiple times, the punch can influence the strength and the size precision of a machined joint when worn to a certain degree, the structural strength of the rivet-free connection is not high, the stress state of the joint is unreasonable, the neck of the joint is concentrated in stress, and the defect of pulling crack exists.
As shown in fig. 1 to 11, an embodiment of the present invention provides a punch-less rivetless connecting device for multi-energy field compounding, including: the die comprises a female die 1, wherein an annular cavity is arranged in the female die 1, grooves are formed in an outer ring and an inner ring at the lower part of the annular cavity, a conical bulge is arranged in the middle of the female die 1, and a first metal plate 2 and a second metal plate 3 are arranged at the top of the female die 1; the blank holder 4 is annularly arranged above the second metal plate 3, and an annular blank holder coil 5 is embedded in the blank holder 4; the upper die 6 is arranged above the female die 1, the upper die 6 moves in the vertical direction, the lower part of the upper die 6 is cylindrical, and a cylindrical hole is formed in the center of the lower part of the upper die 6; the controller 7 is arranged at the top of the upper die 6; the upper die electromagnetic module 8 is integrated on a circuit board of the controller 7, the upper die electromagnetic module 8 is electrically connected with a first end of the controller 7, and the upper die electromagnetic module 8 comprises a plurality of upper die electromagnetic loops; the blank holder electromagnetic circuit 9 is integrated on the circuit board of the controller 7, and the blank holder electromagnetic circuit 9 is electrically connected with the second end of the controller 7.
According to the multi-energy field composite punch-less rivet-less connecting device and method provided by the embodiment of the invention, each upper die electromagnetic circuit and each blank holder electromagnetic circuit 9 are integrated on a circuit board of the controller 7, the blank holder coil 5 is embedded in the blank holder 4 in an annular shape, each upper die electromagnetic circuit and each blank holder electromagnetic circuit 9 are powered by the controller 7, charging circuits are not interfered with each other, and the controller 7 controls the closing of switches in each upper die electromagnetic circuit and each blank holder electromagnetic circuit 9.
Wherein, die 1 includes: the first lower electrode 10 is installed at the edge of the annular cavity at the first side of the female die 1; the second lower electrode 11 is arranged on the edge, close to the annular cavity of the female die 1, of the first side in the conical bulge, and the second lower electrode 11 is arranged on the edge, close to the annular cavity, of the female die 1; the third lower electrode 12 is arranged on the second side in the conical bulge, and is close to the edge of the annular cavity of the female die 1; a fourth lower electrode 13, wherein the fourth lower electrode 13 is installed at the edge of the annular cavity at the second side of the female die 1; the first transformer 14 is installed on the first side of the female die 1, a first end of the first transformer 14 is electrically connected with a third end of the controller 7, a second end of the first transformer 14 is electrically connected with the first lower electrode 10, and a third end of the first transformer 14 is electrically connected with the second lower electrode 11; the second transformer 15 is installed on the second side of the female die 1, the first end of the second transformer 15 is electrically connected with the fourth end of the controller 7, the second end of the second transformer 15 is electrically connected with the third lower electrode 12, and the third end of the second transformer 15 is electrically connected with the fourth lower electrode 13.
According to the device and the method for connecting the multi-energy field composite punch-less type rivet-less connector, the first transformer 14 and the second transformer 15 are installed on two sides of the female die 1, first ends of the first transformer 14 and the second transformer 15 are respectively and electrically connected with a third end and a fourth end of the controller 7, and the controller 7 provides voltage for the first transformer 14 and the second transformer 15.
Wherein, go up mould 6 includes: the upper die coil 16 is annularly embedded in the upper die 6, the upper die coils 16 are provided in plurality, and each upper die coil 16 corresponds to one upper die electromagnetic circuit; a first upper electrode installed at a first outer side of a lower portion of the upper mold 6, the first upper electrode being electrically connected to a fourth end of the first transformer 14; a second upper electrode installed at a first inner side of a lower portion of the upper mold 6, the second upper electrode being electrically connected to a fifth terminal of the first transformer 14; a third upper electrode installed at a second inner side of the lower portion of the upper die 6, the third upper electrode being electrically connected to a fourth terminal of the second transformer 15; and a fourth upper electrode 17, wherein the fourth upper electrode 17 is installed on a second outer side of the lower portion of the upper die 6, and the fourth upper electrode 17 is electrically connected to a fifth terminal of the second transformer 15.
Wherein each said upper die electromagnetic circuit comprises: a first switch 18, a first end of the first switch 18 being electrically connected to a corresponding first end of the upper mold coil 16; a first capacitor 19, wherein a first end of the first capacitor 19 is electrically connected to a second end of the first switch 18; a first inductor 20, a first end of the first inductor 20 being electrically connected to a second end of the first capacitor 19; a first resistor 21, wherein a first end of the first resistor 21 is electrically connected to a second end of the first inductor 20, and a second end of the first resistor 21 is electrically connected to a corresponding second end of the upper mold coil 16.
Wherein, blank holder electromagnetic circuit 9 includes: a first end of the second switch is electrically connected with a first end of the blank holder coil 5; a second capacitor, a first end of the second capacitor being electrically connected to a second end of the second switch; a first end of the second inductor is electrically connected with a second end of the second capacitor; and a first end of the second resistor is electrically connected with a second end of the second inductor, and a second end of the second resistor is electrically connected with a second end of the blank holder coil 5.
Wherein the first lower electrode 10, the second lower electrode 11, the third lower electrode 12, and the fourth lower electrode 13 are provided in a fan shape.
The sections of the coils in the blank holder coil 5 and each upper die coil 16 are spiral tube coils formed by winding round or rectangular red copper wires.
According to the punch-less rivet-less connecting device and method of the multi-energy field composite, the blank holder coil 5 and each upper die coil 16 can be formed by combining more than one sub-coil, each upper die electromagnetic circuit and the blank holder electromagnetic circuit 9 are matched with the female die 1, a composite structure with two mechanical locks 23 with four welding spots 22 is finally manufactured, and the joint strength of rivet-less connection is greatly improved.
The embodiment of the invention also provides a punch-head-free rivet-free connecting method for multi-energy field compounding, which comprises the following steps: step 1, a first metal plate 2 and a second metal plate 3 are stacked on the top of a female die 1; step 2, the controller 7 charges a first capacitor 19 in each upper die electromagnetic loop and a second capacitor in the blank holder electromagnetic loop 9, and the charging is stopped after each first capacitor 19 and each second capacitor reach specified voltage; step 3, the controller 7 controls a first switch 18 in each upper die electromagnetic loop and a second switch in the blank holder electromagnetic loop 9 to be closed, each upper die coil 16 and the blank holder coil 5 are electrified, the upper die 6 descends in the vertical direction, a constant magnetic field is formed among the blank holder 4, the upper die 6 and the female die 1, the blank holder 4 compresses the first metal plate 2 and the second metal plate 3 under the action of the magnetic field force, and the magnetic field under each upper die coil 16 enables the first metal plate 2 and the second metal plate 3 on the annular cavity of the female die 1 to generate plastic deformation under the action of the magnetic field force to gradually fill the annular cavity; step 4, the plastic deformation degree of the first metal plate 2 and the second metal plate 3 is gradually deepened, the first metal plate 2 is contacted with the bottom of the annular cavity, the first metal plate 2 and the second metal plate 3 are restrained by the bottom plane of the annular cavity and gradually flow to the annular cavities of the inner ring and the outer ring of the female die 1, the material of the first metal plate 2 at the plastic deformation positions of the inner ring and the outer ring flows to the neck of the second metal plate 3 and is embedded into the second metal plate 3, and two mechanical locks 23 of the inner ring and the outer ring are gradually formed; step 5, the first capacitor 19 in each upper die electromagnetic loop and the second capacitor in the blank holder electromagnetic loop 9 are discharged, the first switch 18 in each upper die electromagnetic loop and the second switch in the blank holder electromagnetic loop 9 are automatically opened, each upper die coil 16 and the blank holder coil 5 are de-energized, the upper die 6 descends to a preset position to stop advancing, the fourth upper electrode 17 is opposite to and contacts with the neck without a rivet joint, the first upper electrode is communicated with the first lower electrode 10, the second upper electrode is communicated with the second lower electrode 11, the third upper electrode is communicated with the third lower electrode 12, the fourth upper electrode 17 is communicated with the fourth lower electrode 13, four welding points 22 are correspondingly formed between the upper electrode and the lower electrode in pairs, a composite structure of an inner ring and an outer ring mechanical lock 23 with the four welding points 22 is obtained, the first metal plate 2 and the second metal plate 3 are machined, and the upper die 6 returns to the original position.
Before the device and the method for connecting the multi-energy field composite punch-less type and rivet-less type in the embodiment of the invention start to work, the blank holder 4 and the female die 1 are fixed, the first metal plate 2 and the second metal plate 3 are stacked on the top of the female die 1, the upper die 6 is positioned above the second metal plate 3, and the central axes of the upper die 6, the blank holder 4 and the female die 1 are overlapped. The implementation process is as follows: starting the controller 7 to charge the first capacitor 19 in each upper die electromagnetic circuit and the second capacitor in the blank holder electromagnetic circuit 9, stopping charging when each first capacitor 19 and the second capacitor reach a specified voltage, controlling the first switch 18 in each upper die electromagnetic circuit and the second switch in the blank holder electromagnetic circuit 9 to be closed by the controller 7, electrifying each upper die coil 16 and the blank holder coil 5, simultaneously descending the upper die 6, forming a constant magnetic field among the blank holder 4, the upper die 6 and the female die 1, wherein the magnetic field force under the blank holder 4 mainly acts to compress the first metal plate 2 and the second metal plate 3, and the magnetic field under each upper die coil 16 causes the first metal plate 2 and the second metal plate 3 on the annular cavity of the female die 1 to generate plastic deformation under the action of the magnetic field force, gradually filling the annular cavity, gradually deepening the plastic deformation degree of the first metal plate 2 and the second metal plate 3, enabling the first metal plate 2 to be in contact with the bottom of the annular cavity, enabling the first metal plate 2 and the second metal plate 3 to be constrained by the bottom plane of the annular cavity and gradually flow towards the annular cavities of the inner ring and the outer ring of the female die 1, enabling the material of the first metal plate 2 at the plastic deformation positions of the inner ring and the outer ring to flow towards the neck of the second metal plate 3 and be embedded into the second metal plate 3, gradually forming two mechanical locks 23 of the inner ring and the outer ring, and automatically opening the first switch 18 in each upper die electromagnetic loop and the second switch in the blank holder electromagnetic loop 9 after the first capacitor 19 in each upper die electromagnetic loop and the second capacitor in the blank holder electromagnetic loop 9 are discharged, when each upper die coil 16 and the blank holder coil 5 are powered off, the upper die 6 just descends to a preset position to stop advancing, the fourth upper electrode 17 at the position is just right opposite to and in contact with the neck without the rivet joint, the controller 7 is used for electrifying the first transformer 14 and the second transformer 15 while the fourth upper electrode 17 is just right opposite to and in contact with the neck without the rivet joint, the first upper electrode is communicated with the first lower electrode 10, the second upper electrode is communicated with the second lower electrode 11, the third upper electrode is communicated with the third lower electrode 12, the fourth upper electrode 17 is communicated with the fourth lower electrode 13, the upper electrode is correspondingly communicated with the lower electrode in pairs to form four welding spots 22, and the first metal plate 2 and the second metal plate 3 are processed completely, the upper die 6 is retracted to the original position, and finally a composite structure of an inner ring and an outer ring mechanical lock 23 with four welding points 22 is obtained on the female die 1.
The punch-less rivetless connecting device and method of the multi-energy field compounding in the above embodiment of the invention, without using a punch, the conductive metal plate is automatically formed under the action of the magnetic field force by using the electromagnetic pulse, in the forming process, the forming tool is not contacted with the upper metal plate, the generation of abrasion and fracture of the traditional rivetless connecting punch is avoided, the magnetic field, the electric field and the plastic mechanical field are organically unified, the combined action of the fields improves the microstructure, the device is effectively used for the production of the high-strength rivetless connecting joint, the high-speed deformation of the metal plate caused by the electromagnetic pulse can improve the material flowability of the neck part of the rivetless connecting joint of the metal plate, the pulling crack defect in the traditional rivetless connection is overcome, the forming performance of the plate is improved, the forming limit can be greatly improved, the high-quality joint is obtained, and the formed mechanical locks 23 are distributed in a ring form, the mechanical locks 23 are formed on the inner ring and the outer ring, so that the connection strength is higher, and the mechanical property of the joint is obviously improved.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a compound no punch head formula of multipotency field does not have and rivets connecting device which characterized in that includes:
the die comprises a female die, wherein an annular cavity is arranged in the female die, grooves are formed in an outer ring and an inner ring at the lower part of the annular cavity, a conical protrusion is arranged in the middle of the female die, and a first metal plate and a second metal plate are arranged at the top of the female die;
the blank holder is annularly arranged above the second metal plate, and an annular blank holder coil is embedded in the blank holder;
the upper die is arranged above the female die and moves in the vertical direction, the lower part of the upper die is cylindrical, and a cylindrical hole is formed in the center of the lower part of the upper die;
the controller is arranged at the top of the upper die;
the upper die electromagnetic module is integrated on a circuit board of the controller, electrically connected with the first end of the controller and comprises a plurality of upper die electromagnetic loops;
the blank holder electromagnetic circuit is integrated on the circuit board of the controller and is electrically connected with the second end of the controller.
2. The multi-energy field composite punch-less rivetless connecting device of claim 1, wherein the female die comprises:
the first lower electrode is arranged at the edge of the annular cavity at the first side of the female die;
the second lower electrode is arranged on the edge, close to the annular cavity, of the first side in the conical bulge;
the third lower electrode is arranged on the edge, close to the annular cavity, of the second side in the conical bulge;
the fourth lower electrode is arranged at the edge of the annular cavity at the second side of the female die;
the first transformer is arranged on the first side of the female die, the first end of the first transformer is electrically connected with the third end of the controller, the second end of the first transformer is electrically connected with the first lower electrode, and the third end of the first transformer is electrically connected with the second lower electrode;
the second transformer is installed on the second side of the concave die, the first end of the second transformer is electrically connected with the fourth end of the controller, the second end of the second transformer is electrically connected with the fourth lower electrode, and the third end of the second transformer is electrically connected with the third lower electrode.
3. The multi-energy field composite punch-less rivetless connecting device of claim 2, wherein the upper die comprises:
the upper die coils are annularly embedded in the upper die, a plurality of upper die coils are arranged, and each upper die coil corresponds to one upper die electromagnetic circuit;
the first upper electrode is arranged on the first outer side of the lower part of the upper die and is electrically connected with the fourth end of the first transformer;
a second upper electrode mounted on a first inner side of a lower portion of the upper die, the second upper electrode being electrically connected to a fifth terminal of the first transformer;
a third upper electrode mounted on a second inner side of the lower portion of the upper die, the third upper electrode being electrically connected to a fourth end of the second transformer;
and the fourth upper electrode is arranged on the second outer side of the lower part of the upper die and is electrically connected with the fifth end of the second transformer.
4. The multi-energy field compound punch-less rivetless connecting device according to claim 3, wherein each of the upper die electromagnetic circuits comprises:
a first switch, a first end of which is electrically connected with a first end of the corresponding upper die coil;
a first end of the first capacitor is electrically connected with a second end of the first switch;
a first end of the first inductor is electrically connected with a second end of the first capacitor;
and a first end of the first resistor is electrically connected with a second end of the first inductor, and a second end of the first resistor is electrically connected with a corresponding second end of the upper die coil.
5. The multi-energy field composite punch-less rivetless connection device of claim 4, wherein the blankholder electromagnetic circuit comprises:
a first end of the second switch is electrically connected with a first end of the blank holder coil;
a second capacitor, a first end of the second capacitor being electrically connected to a second end of the second switch;
a first end of the second inductor is electrically connected with a second end of the second capacitor;
and a first end of the second resistor is electrically connected with a second end of the second inductor, and a second end of the second resistor is electrically connected with a second end of the blank holder coil.
6. The multi-energy field compounding punch-less rivetless connection device of claim 5, wherein the first lower electrode, the second lower electrode, the third lower electrode, and the fourth lower electrode are arranged in a fan shape.
7. The multi-energy field composite punch-less rivetless connecting device according to claim 6, wherein the coil cross-section in the blankholder coil and each upper die coil is a helical tube coil made of round or rectangular red copper wire.
8. The punch-head-free rivet-free connection method for multi-energy field compounding is characterized by comprising the following steps of:
step 1, stacking a first metal plate and a second metal plate on the top of a female die;
step 2, charging a first capacitor in each upper die electromagnetic loop and a second capacitor in each blank holder electromagnetic loop by a controller, and stopping charging after each first capacitor and each second capacitor reach specified voltage;
step 3, the controller controls a first switch in each upper die electromagnetic loop and a second switch in the blank holder electromagnetic loop to be closed, each upper die coil and the blank holder coil are electrified, the upper die descends in the vertical direction, a constant magnetic field is formed among the blank holder, the upper die and the female die, the blank holder compresses the first metal plate and the second metal plate under the action of the magnetic field force, and the magnetic field under each upper die coil enables the first metal plate and the second metal plate on the annular cavity of the female die to generate plastic deformation under the action of the magnetic field force to gradually fill the annular cavity;
step 4, the plastic deformation degree of the first metal plate and the second metal plate is gradually deepened, the first metal plate is in contact with the bottom of the annular cavity, the first metal plate and the second metal plate are restrained by the bottom plane of the annular cavity and gradually flow to grooves of an inner ring and an outer ring of the female die, materials of the first metal plate at the plastic deformation positions of the inner ring and the outer ring flow to the neck of the second metal plate and are embedded into the second metal plate, and two mechanical locks of the inner ring and the outer ring are gradually formed;
and 5, finishing discharging of a first capacitor in each upper die electromagnetic loop and a second capacitor in the blank holder electromagnetic loop, automatically opening a first switch in each upper die electromagnetic loop and a second switch in the blank holder electromagnetic loop, losing power of each upper die coil and the blank holder coil, descending the upper die to a preset position to stop advancing, enabling a fourth upper electrode to be opposite to and in contact with a neck without a rivet joint, communicating the first upper electrode with a first lower electrode, communicating the second upper electrode with a second lower electrode, communicating the third upper electrode with a third lower electrode, communicating the fourth upper electrode with a fourth lower electrode, forming four welding points between the upper electrode and the lower electrode in a pairwise correspondence manner to obtain a composite structure of an inner ring and an outer ring mechanical lock with the four welding points, finishing machining of the first metal plate and the second metal plate, and returning the upper die to an original position.
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