CN112439827B - Electromagnetic flanging forming device and method - Google Patents
Electromagnetic flanging forming device and method Download PDFInfo
- Publication number
- CN112439827B CN112439827B CN202011423101.1A CN202011423101A CN112439827B CN 112439827 B CN112439827 B CN 112439827B CN 202011423101 A CN202011423101 A CN 202011423101A CN 112439827 B CN112439827 B CN 112439827B
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- female die
- field shaper
- pipe fitting
- plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
- B21D19/00—Flanging or other edge treatment, e.g. of tubes
- B21D19/08—Flanging or other edge treatment, e.g. of tubes by single or successive action of pressing tools, e.g. vice jaws
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
Abstract
The invention provides an electromagnetic flanging forming device and method, comprising the following steps: the device comprises a spiral tube driving coil, a magnetic field shaper and a concave die; the magnetic field shaper comprises: a hollow cylinder and two bosses; the spiral tube driving coil is wound on the hollow cylinder above the boss; after the spiral tube driving coil is electrified, an induction magnetic field is generated around the spiral tube driving coil; the connecting line of the two bosses of the magnetic field shaper is parallel to the upper plane of the female die; when a plate to be flanged with a middle hole is placed on the female die, the lower end of the magnetic field shaper is gradually placed into the middle hole, so that an induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the plate to drive the plate to be flanged and formed; when the pipe fitting to be flanged is placed in the female die, the lower end of the magnetic field shaper is gradually placed in the raised pipe fitting, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the pipe fitting to drive the pipe fitting to be flanged and shaped. The invention improves the forming capability of the electromagnetic flanging device and the forming precision of the workpiece.
Description
Technical Field
The invention belongs to the technical field of metal forming and manufacturing, and particularly relates to an electromagnetic flanging forming device and method.
Background
The use of the light alloy material provides an effective realization way for the light weight of industrial production in the fields of automobiles, aerospace and the like. The common light alloy materials such as aluminum alloy, titanium alloy, magnesium alloy and the like have poor forming performance at room temperature, and the defects of cracks, springback and the like of workpieces are easy to generate by adopting the traditional processing technology. Research shows that the high-speed forming can effectively improve the forming performance of the light alloy at room temperature, and the electromagnetic forming is widely applied to the processing field of light alloy materials such as aluminum alloy and the like as a technology for forming metal materials at high speed by utilizing Lorentz force.
The electromagnetic flanging is a specific application of electromagnetic forming, and in the electromagnetic flanging, the following common problems exist: 1. due to the limitation of the coil structure, the workpiece is difficult to be attached to a die after one-time discharge, but during multiple times of discharge, the distance between the workpiece and the coil is often increased, so that the electromagnetic force borne by the workpiece is insufficient, and the workpiece is difficult to be driven to continuously deform, and therefore, multiple coils with different structures need to be wound to carry out multi-step incremental forming on the workpiece; 2. for non-axisymmetrical flanging workpieces, such as special-shaped hole workpieces like inclined holes, square holes, racetrack-shaped holes and the like, a special-shaped coil is often needed to enable the workpieces to obtain proper electromagnetic force distribution, but the special-shaped coil is often difficult to wind, the structural strength of the special-shaped coil is also difficult to guarantee, and the application range of the electromagnetic flanging technology is greatly limited.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an electromagnetic flanging forming device and method, aiming at solving the problems that in the traditional electromagnetic flanging method, due to the limitation of coil structure and strength, the distribution of a forming force field cannot be regulated at will, so that a workpiece with high die attaching precision is difficult to obtain through one-step forming, a coil is difficult to keep always close to the workpiece to apply enough electromagnetic force in multi-step progressive electromagnetic forming, and the coil with a complex shape is difficult to wind to meet the flanging requirement of a special-shaped part.
In order to achieve the above object, in a first aspect, the present invention provides an electromagnetic burring forming apparatus, including: the device comprises a spiral tube driving coil, a magnetic field shaper and a concave die;
the magnetic field shaper includes: a hollow cylinder and two bosses; the two bosses are positioned on two sides of the hollow column body;
the spiral tube driving coil is wound on the hollow cylinder above the boss; after the spiral tube driving coil is electrified, an induction magnetic field is generated around the spiral tube driving coil;
the female die is an inwards concave die, and the shape of the inwards concave die is consistent with the requirement on the forming shape of a workpiece to be flanged; the outer contour of the hollow cylinder below the boss of the magnetic field shaper is matched with the shape of the female die; the connecting line of the two bosses of the magnetic field shaper is parallel to the upper plane of the female die; the workpiece to be flanged is a plate or a pipe fitting;
when a plate to be flanged and provided with a middle hole is placed on the female die, the lower end of the magnetic field shaper is gradually placed into the middle hole, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the plate, and the middle hole of the plate is driven to gradually flange and form towards the inner wall of the female die;
when a pipe fitting to be flanged is placed in the female die, the shape of the pipe fitting is matched with the concave shape of the female die, a section of bulge is arranged above the upper surface of the female die, the lower end of the magnetic field shaper is gradually placed in the raised pipe fitting, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the pipe fitting, and the raised pipe fitting is driven to be flanged and formed towards the upper surface of the female die gradually.
In an alternative embodiment, the lower end of the magnetic field shaper is gradually placed into the central bore, specifically: the multi-step progressive flanging forming is carried out on the hole in the plate, the magnetic field shaper is moved downwards under the condition that the flanging forming is carried out on the plate in the previous step, and the gap between the magnetic field shaper and the hole in the plate is smaller than a preset value during each step of forming, so that the multi-step progressive flanging forming towards the inner wall of the female die of the hole in the plate is promoted; or
The lower end of the magnetic field shaper is gradually placed into the raised pipe fitting, and the method specifically comprises the following steps: and (3) multi-step progressive flanging and forming the pipe fitting, and moving the magnetic field shaper downwards under the condition of flanging and forming the raised pipe fitting in the previous step, so that the clearance between the magnetic field shaper and the inner wall of the pipe fitting is smaller than a preset value during each step of forming, and the raised pipe fitting is promoted to be flanged and formed towards the upper surface of the female die in a multi-step progressive manner.
In an alternative embodiment, the shape of the lower surfaces of the two bosses matches the shape of the die flange and the chamfer.
In an optional embodiment, when a plate to be formed is placed on the female die, the electromagnetic flanging forming device further includes: pressing an edge block;
the edge pressing block is placed on the plate on the upper surface of the female die and provides edge pressing force for the plate so as to ensure that the position of the plate piece on the upper surface of the female die is unchanged in the hole flanging forming process of the plate.
In an optional embodiment, when a plate to be formed is placed on the female die, the projection areas of the bosses on the two sides of the hollow cylinder on the upper surface of the female die are smaller than a preset area, and the projections of the bosses on the two sides of the hollow cylinder on the upper surface of the female die are not overlapped with the edge pressing block.
In an optional embodiment, when a pipe to be formed is placed in the female die, the projection areas of the bosses on the two sides of the hollow cylinder on the upper surface of the female die are larger than a preset area, so that the induced magnetic fields of the gaps between the lower surfaces of the bosses on the two sides of the hollow cylinder and the pipe provide driving force for flanging and forming the pipe.
It can be understood that when the pipe fitting is formed, the lower surface of the boss of the magnetic field shaper drives the workpiece to axially deform downwards, the pipe fitting mainly needs to deform towards the flange area of the female die, the hollow cylinder below the boss is mainly arranged in the female die, and only the lower surface of the boss faces the flange area of the female die, so that the lower surface of the boss mainly provides driving force for the pipe fitting to the flange area of the female die, and therefore the required boss area is large. When the plate is formed, the middle hole of the plate is mainly required to deform towards the cavity of the female die, so that the plate is mainly provided with driving force by the hollow cylinder extending into the cavity of the female die, the demand of the plate for providing the driving force for the lower surface of the boss is mainly concentrated on the part, deformed by chamfering, of the plate towards the female die, and therefore the required boss area is small.
In an alternative embodiment, the hollow cylinder above the boss is cylindrical to closely nest the solenoid drive coil, and the shape of the hollow cylinder below the boss is determined by the workpiece flanging requirements.
Specifically, the shape of the hollow cylinder below the boss is determined by the workpiece flanging requirement, and the concave shape of the female die is also determined by the workpiece flanging requirement. For example, when the workpiece is a pipe, if the pipe is a cylindrical pipe, an oblique cylindrical pipe, an elliptic cylindrical pipe or the like, the concave shapes of the hollow cylinder below the boss and the concave die are set to be corresponding to the shapes of a cylinder, an oblique cylinder, an elliptic cylinder or the like. For another example, when the workpiece is a plate, if the central hole of the plate is a cylindrical hole, an oblique cylinder hole or an elliptic cylinder hole, and the like, the concave shapes of the hollow cylinder below the boss and the concave die are set to be corresponding cylindrical, oblique cylinder or elliptic cylinder shapes, and the like.
In an alternative embodiment, the solenoid drive coil is wound around the outside of the hollow cylinder above the boss or inside the hollow cylinder above the boss.
In an alternative embodiment, the material of the magnetic field shaper is of a conductivity material greater than a preset conductivity value.
The preset conductivity value can be set according to actual requirements, and the specific conductivity requirement of the material of the magnetic field shaper is higher, such as copper alloy or aluminum alloy.
In a second aspect, the invention provides an electromagnetic flanging forming method, which comprises the following steps:
selecting a magnetic field shaper which comprises a hollow cylinder and two bosses; the two bosses are positioned on two sides of the hollow column body;
winding a spiral tube driving coil on the hollow cylinder above the boss; after the spiral tube driving coil is electrified, an induction magnetic field is generated around the spiral tube driving coil;
selecting a female die, wherein the shape of the outer contour of the hollow cylinder below the boss is matched with that of the cavity of the female die; the connecting line of the two bosses is parallel to the upper plane of the female die;
when a plate to be flanged with a middle hole is placed on the female die, the lower end of the magnetic field shaper is gradually placed into the middle hole, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the plate, and the middle hole of the plate is driven to gradually flange towards the inner wall of the female die; the shape of the hole in the plate is matched with the shape of the outer contour of the hollow cylinder below the boss;
when a pipe fitting to be flanged is placed in the female die, the shape of the pipe fitting is matched with the concave shape of the female die, a section of bulge is arranged above the upper surface of the female die, the lower end of the magnetic field shaper is gradually placed in the raised pipe fitting, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the pipe fitting, and the raised pipe fitting is driven to be flanged and formed towards the upper surface of the female die gradually.
Generally, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:
the invention provides an electromagnetic flanging forming device and method, wherein a magnetic field shaper is added, the magnetic field shaper is divided into three parts, namely a boss upper part, a boss and a boss lower part, and the boss upper part and a spiral tube driving coil are same in shape and are tightly connected with the boss upper part and the spiral tube driving coil; the lower surface of the boss and the chamfer of the female die have the same shape, and gradually move axially downwards to be close to a workpiece in the multi-step asymptotic forming process, so that the chamfer area of the workpiece generates proper electromagnetic force distribution, and good die attaching precision is obtained; the shape of the magnetic field shaper at the lower part of the boss can be optimally designed according to the size of the cavity of the female die and the size of the workpiece, so that the optimal forming quality of the workpiece can be obtained. The surface of the magnetic field shaper, which plays a role in shaping, is more than one, the lower surface of the lower part of the boss of the magnetic field shaper drives the workpiece to axially deform downwards, the magnetic field shaper axially moves downwards along with the increase of the shaping times, the magnetic field shaper at the lower part of the boss drives the workpiece to finish die pasting, the shaping and the shape correction of the workpiece can be finished without replacing extra equipment, the shaping quality of the workpiece is improved, and the shaping capacity of a coil is also enhanced.
The invention provides an electromagnetic flanging forming device and method, which solve the problems that in the traditional electromagnetic flanging method, due to the limitation of coil structure and strength, the distribution of a forming force field can not be regulated and controlled at will, so that a workpiece with high die attaching precision is difficult to obtain through one-step forming, a coil is difficult to keep to be always close to the workpiece to apply enough electromagnetic force in multi-step progressive electromagnetic forming, the coil with a complex shape is difficult to wind to meet the flanging requirement of a special-shaped part, and the like, and can effectively improve the forming capability of an electromagnetic flanging device and the forming precision of the workpiece.
Drawings
FIG. 1 is a schematic view of an electromagnetic flanging device for a plate with a circular hole according to a first embodiment of the invention;
fig. 2 is a schematic view of a magnetic field shaper according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a coil current waveform provided by a capacitive energy storage power system according to an embodiment of the present invention;
fig. 4 is a schematic view of an electromagnetic flanging device for pipe fittings according to a second embodiment of the invention;
FIG. 5 is a schematic view of an electromagnetic flanging device for a plate with an inclined hole according to a third embodiment of the present invention;
FIG. 6 is a schematic view of a multi-step progressive electromagnetic flanging method according to a fourth embodiment of the present invention;
FIG. 7 is a flowchart of an electromagnetic flanging forming method according to an embodiment of the present invention;
the same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1 is a spiral tube driving coil, 2 is a magnetic field shaper, 3 is an edge pressing block, 4 is a power supply system, 5 is a workpiece and 6 is a concave die.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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.
Aiming at the defects and the improvement requirements of the prior art, the invention provides an electromagnetic flanging forming device and method, wherein in the electromagnetic flanging process of a plate pipe fitting, a magnetic field shaper is added between a coil and a workpiece to improve the magnetic field distribution of a workpiece deformation region, so that the electromagnetic force applied to the workpiece meets the forming requirement.
To achieve the above object, according to one aspect of the present invention, there is provided an electromagnetic burring forming device including: the device comprises a spiral tube driving coil, a power supply, a magnetic field shaper, a female die, a workpiece and a blank holder block; the workpiece is arranged above the female die; the edge pressing block is arranged above a flange area of the workpiece; the magnetic field shaper is arranged above the workpiece deformation region; the spiral tube driving coil is arranged outside the magnetic field shaper and is matched with the magnetic field shaper to transmit discharge energy in the spiral tube driving coil to the surface of a workpiece to be flanged through electromagnetic induction so as to drive the workpiece to deform and finish flanging; the power supply system is used for supplying power to the driving coil.
Furthermore, the solenoid drive coil can be arranged inside the magnetic field shaper besides being nested outside the magnetic field shaper, so as to meet the requirements of different device tools or forming efficiency.
Furthermore, the geometric shape of the magnetic field shaper is optimally designed according to the forming requirement of the workpiece so as to meet the requirements of the size and the distribution of the electromagnetic force of the forming area of the workpiece, more effectively realize the flanging of the workpiece and improve the forming precision of the workpiece.
Furthermore, the driving coils and the magnetic field shapers are mutually independent, and for workpieces with different forming shapes, the more complex forming requirements can be met only by replacing different magnetic field shapers, so that the complex process of redesigning and winding coils is avoided, and the special-shaped workpiece winding device is particularly suitable for processing special-shaped workpieces, such as square hole flanging, inclined hole flanging and the like, which are difficult to meet the forming precision through coil design.
Furthermore, for the condition that the die attaching precision of a single-step electromagnetic flanging workpiece and the like do not meet the forming quality requirement, the outer contour of the lower part of the boss of the magnetic field shaper can be designed to be the same as or similar to the shape of the inner contour of the female die, and the forming capability of the device is improved in a multi-step discharging mode, namely, after each step of forming, the magnetic field shaper always keeps a minimum gap with the workpiece through axial movement, the magnetic field shaper is equivalent to a 'punch' which is not in contact with the workpiece to drive the workpiece to attach the die, and an additional shaping step is not needed to obtain a high-quality formed part.
Furthermore, the device for combining the spiral pipe coil and the magnetic field shaper is not only limited to electromagnetic flanging, but also can be expanded to other fields of electromagnetic forming, such as axial symmetry plate pipe fitting molded electromagnetic forming and the like, or occasions which are difficult to meet the forming requirements of workpieces by means of traditional forming coil regulation and control, such as electromagnetic forming of special-shaped parts.
Furthermore, the electromagnetic forming device can also be combined with a plurality of magnetic field shapers and driving coils, a plurality of power supplies are used for supplying power, and the power supplies, the driving coils and the magnetic field shapers are optimally matched, so that the space-time distribution of the forming magnetic field is more accurately regulated and controlled, and the more complex forming requirements are met.
According to another aspect of the present invention, there is provided an electromagnetic burring forming method including the steps of:
step (1): placing the workpiece on the female die, and applying a blank holder force on a flange area of the workpiece through a blank holder block;
step (2): nesting the spiral tube driving coil outside the magnetic field shaper and electrically connecting the spiral tube driving coil with the power supply;
and (3): before each step of discharging, the magnetic field shaper is moved axially to keep a minimum gap with the workpiece, and electromagnetic force is generated in a workpiece forming area through electromagnetic induction to drive the workpiece to complete flanging.
Further, the workpiece includes, but is not limited to, a perforated plate member to be flanged, a pipe member to be flanged, a profile member to be formed, and the like.
In a more specific embodiment, the present invention provides an electromagnetic flanging device, for example, for flanging a plate with a circular hole by electromagnetic forming, as shown in fig. 1, including: the device comprises a spiral tube driving coil 1, a magnetic field shaper 2, a blank holder block 3, a power supply 4, a workpiece 5 and a concave die 6. The workpiece 5 is arranged above the female die 6, and the female die 6 is used for restraining a deformation area of the workpiece 5 and improving the forming precision of the workpiece 5; the edge pressing block 3 is arranged above a flange area of the workpiece 5 and used for providing edge pressing force for the workpiece 5 in the electromagnetic forming process, and controlling the radial flow quantity of the flange area of the workpiece 5 to a cavity of the female die 6 by adjusting the edge pressing force to prevent the workpiece 5 from wrinkling; the magnetic field shaper 2 is arranged above a deformation area of the workpiece 5; the spiral tube driving coil 1 can be arranged outside the magnetic field shaper 2 or inside the magnetic field shaper and used for generating rapidly changing current, the magnetic field shaper 2 is tightly connected with the spiral tube driving coil 1 so as to reduce the loss of a magnetic field, the discharge energy in the spiral tube driving coil 1 is transmitted to the surface of a workpiece 5 to be flanged through electromagnetic induction, huge Lorentz force is induced on the workpiece 5, and the workpiece 5 is driven to deform so as to complete flanging; the power supply system 4 is used for supplying power to the spiral tube driving coil 1, the type of the power supply is not limited, a capacitor type power supply can be adopted, a storage battery pulse power supply can also be adopted, and the like.
The cross section and the top view of the magnetic field shaper 2 are shown in fig. 2, the magnetic field shaper is a cylindrical rotating body structure with a through hole at the center, and a longitudinal slit is formed along a certain radius. The magnetic field shaper is divided into three parts, namely a boss upper part, a boss and a boss lower part, wherein the boss upper part is the same as and tightly connected with the spiral tube driving coil; the lower surface of the boss and the chamfer of the female die have the same shape, and gradually move axially downwards to be close to a workpiece in the multi-step asymptotic forming process, so that the chamfer area of the workpiece generates proper electromagnetic force distribution, and good die attaching precision is obtained; the shape of the magnetic field shaper at the lower part of the boss can be optimally designed according to the size of the cavity of the female die and the size of the workpiece, so that the optimal forming quality of the workpiece can be obtained. The material selection of the magnetic field shaper needs to consider the conductivity and the intensity, and can select copper alloy or aluminum alloy. The magnetic field shaper has the function of concentrating the induced current on the close face (the hollow cylinder on the upper part of the boss) of the coil to the surface of the magnetic field shaper on the lower part of the boss corresponding to the cavity of the female die, inducing eddy current on a workpiece to generate electromagnetic force, driving the workpiece to finish flanging and ensuring good forming quality of the workpiece.
Preferably, different from the principle of the magnetic collector, the surface of the magnetic field shaper which performs the forming function has more than one part, for example, in the third embodiment, firstly, the lower surface of the boss of the magnetic field shaper drives the workpiece to axially deform downwards, and as the forming times are increased, the magnetic field shaper also moves axially downwards, and the magnetic field shaper on the lower part of the boss drives the workpiece to complete the die pasting, so that the forming and the shape correction of the workpiece can be completed without replacing extra equipment, the forming quality of the workpiece is improved, and the forming capability of the coil is also enhanced.
According to another aspect of the invention, the invention further provides an electromagnetic flanging method, which comprises the following steps:
(1) the workpiece to be flanged and the female die are oppositely placed;
(2) placing a blank holder, a tightly connected spiral tube driving coil and a magnetic field shaper above a workpiece to be flanged, wherein a gap between the magnetic field shaper and the workpiece is as small as possible;
the clearance value needs to consider the following factors: the smaller the gap is, the larger the electromagnetic force induced by the workpiece is, which is beneficial to the deformation of the workpiece, but the insulation treatment is needed between the magnetic field shaper and the workpiece, so that the discharge between the magnetic field shaper and the workpiece is prevented in the forming process.
(3) And starting a power supply system, introducing a rapidly-changing current into the driving coil, inducing an eddy current on the surface of the magnetic field shaper close to the driving coil, transmitting the eddy current to the surface of the magnetic field shaper corresponding to the workpiece through the magnetic field shaper, inducing the eddy current on the workpiece, and generating electromagnetic force to drive the workpiece to deform.
For the power supply system 4, a capacitor bank power supply may be used, with the specific current waveform shown in fig. 3. Wherein the abscissa represents time and the decay period is 10-1～101The millisecond magnitude, the ordinate represents the current value, the current amplitude is generally dozens of kiloamperes, and the rapidly changing current and the larger current amplitude ensure that the workpiece can obtain enough electromagnetic force to complete deformation.
Fig. 4 is a schematic view of an electromagnetic flanging device for pipe fittings according to a second embodiment of the invention, the main components of which include: the device comprises a spiral tube driving coil 1, a magnetic field shaper 2, a power supply system 4, a workpiece 5 and a concave die 6. Wherein, the workpiece is a metal pipe fitting and is arranged in the female die; the force application area (the lower part of the boss) of the magnetic field shaper is arranged in the deformation area of the workpiece, and the gap between the magnetic field shaper and the pipe fitting is ensured to be as small as possible through reasonable size design; the spiral tube driving coil is arranged outside the magnetic field shaper and is matched with the magnetic field shaper to transmit discharge energy in the spiral tube driving coil to the surface of a workpiece to be flanged through electromagnetic induction so as to drive the workpiece to deform and finish flanging; the power system is used for supplying power to the solenoid coil drive coil.
Fig. 5 is a schematic view of an electromagnetic flanging device for a plate with an inclined hole according to a third embodiment of the invention, and the main components include: the device comprises a spiral tube driving coil 1, a magnetic field shaper 2, a blank holder block 3, a power supply system 4, a workpiece 5 and a concave die 6. The shape and the inclination angle of the lower part of the boss of the magnetic field shaper are consistent with those of a cavity of a female die, the specific size is optimally designed according to the electromagnetic force distribution required by a workpiece, and the final deformation uniformity and good die attaching precision of the workpiece are ensured.
Fig. 6 is a schematic view of a multi-step progressive electromagnetic flanging method according to a fourth embodiment of the present invention, and the apparatus mainly includes: the device comprises a spiral tube driving coil 1, a magnetic field shaper 2, a blank holder block 3, a power supply system 4, a workpiece 5 and a concave die 6.
The multiple progressive electromagnetic flanging method comprises the following steps:
(1) placing a workpiece 5 to be flanged on a female die 6;
(2) placing the edge pressing block 3, the tightly connected spiral tube driving coil 1 and the magnetic field shaper 2 above a workpiece 5 to be flanged, wherein the gap between the magnetic field shaper 2 and the workpiece 5 is as small as possible;
(3) selecting proper discharge energy, discharging the spiral tube driving coil 1 through the power supply 4, and generating electromagnetic force to drive the workpiece to deform;
(4) and (5) moving the magnetic field shaper 2 axially downwards to be close to the workpiece, and repeating the step (3) until the workpiece is completely attached to the die.
Fig. 7 is a flowchart of an electromagnetic flanging forming method according to an embodiment of the present invention, as shown in fig. 7, including the following steps:
s101, selecting a magnetic field shaper which comprises a hollow cylinder and two bosses; the two bosses are positioned on two sides of the hollow column body;
s102, winding a spiral tube driving coil on the hollow cylinder above the boss; after the spiral tube driving coil is electrified, an induction magnetic field is generated around the spiral tube driving coil;
s103, selecting a female die, wherein the shape of the outer contour of the hollow cylinder below the boss is matched with the cavity of the female die; the connecting line of the two bosses is parallel to the upper plane of the female die;
s104, when a plate to be flanged with a middle hole is placed on the female die, the lower end of the magnetic field shaper is gradually placed into the middle hole, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the plate, and the middle hole of the plate is driven to gradually flange towards the inner wall of the female die; the shape of the hole in the plate is matched with the shape of the outer contour of the hollow cylinder below the boss;
s105, when a pipe fitting to be flanged is placed in the female die, the shape of the pipe fitting is matched with the concave shape of the female die, a section of bulge is arranged above the upper surface of the female die, the lower end of the magnetic field shaper is gradually placed in the raised pipe fitting, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the pipe fitting, and the raised pipe fitting is driven to be flanged and formed towards the upper surface of the female die gradually.
Specifically, the detailed implementation of each step in fig. 7 can refer to the description in the foregoing method embodiment, and is not described herein again.
The invention discloses an electromagnetic flanging forming device and method. The device comprises a spiral tube driving coil, a power supply, a magnetic field shaper, a female die, a workpiece and an edge pressing block. The method comprises the following steps of placing a workpiece above a female die, placing a blank holder block above a flange region of the workpiece, placing a magnetic field shaper above a deformation region of the workpiece, and placing a driving coil of a spiral pipe outside the magnetic field shaper. And starting a power supply system, introducing a rapidly-changing current into the driving coil, inducing a vortex on the surface of the magnetic field shaper close to the driving coil, transmitting the vortex to the surface of the magnetic field shaper corresponding to the workpiece through the magnetic field shaper, inducing the vortex on the workpiece, generating electromagnetic force to drive the workpiece to deform, and finally achieving the purpose of flanging the plate. The invention combines the spiral pipe coil and the magnetic field shaper, can flexibly and accurately regulate and control the size and the distribution of the force field of the workpiece in the flanging process through the optimized design of the magnetic field shaper, can effectively reduce the design difficulty and the manufacturing cost of a forming device compared with designing and manufacturing a coil with a special shape to meet the flanging requirement, and greatly expands the application range of the existing electromagnetic flanging technology.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. An electromagnetic flanging forming device, comprising: the device comprises a spiral tube driving coil, a magnetic field shaper and a concave die;
the magnetic field shaper includes: a hollow cylinder and a circular boss; the circular boss is positioned on the outer side of the hollow cylinder;
the spiral tube driving coil is wound on the hollow cylinder above the boss; after the spiral tube driving coil is electrified, an induction magnetic field is generated around the spiral tube driving coil;
the female die is an inwards concave die, and the shape of the inwards concave die is consistent with the requirement on the forming shape of a workpiece to be flanged; the outer contour of the hollow cylinder below the boss of the magnetic field shaper is matched with the shape of the female die; the boss of the magnetic field shaper is parallel to the upper plane of the female die; the workpiece to be flanged is a plate or a pipe fitting;
when a plate to be flanged and provided with a middle hole is placed on the female die, the lower end of the magnetic field shaper is gradually placed into the middle hole, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the plate, and the middle hole of the plate is driven to gradually flange and form towards the inner wall of the female die; gradually placing the lower end of the magnetic field shaper into the mesopore, specifically: the multi-step progressive flanging forming is carried out on the hole in the plate, the magnetic field shaper is moved downwards under the condition that the flanging forming is carried out on the plate in the previous step, and the gap between the magnetic field shaper and the hole in the plate is smaller than a preset value during each step of forming, so that the multi-step progressive flanging forming towards the inner wall of the female die of the hole in the plate is promoted;
when a pipe fitting to be flanged is placed in the female die, the shape of the pipe fitting is matched with the concave shape of the female die, a section of bulge is arranged above the upper surface of the female die, the lower end of the magnetic field shaper is gradually placed in a raised pipe fitting, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the pipe fitting, and the raised pipe fitting is driven to be flanged and formed towards the upper surface of the female die gradually; gradually putting the lower end of the magnetic field shaper into the interior of the convex pipe fitting, specifically: and (3) multi-step progressive flanging and forming the pipe fitting, and moving the magnetic field shaper downwards under the condition of flanging and forming the raised pipe fitting in the previous step, so that the clearance between the magnetic field shaper and the inner wall of the pipe fitting is smaller than a preset value during each step of forming, and the raised pipe fitting is promoted to be flanged and formed towards the upper surface of the female die in a multi-step progressive manner.
2. The electromagnetic flanging forming device of claim 1, wherein the shape of the lower surface of the boss matches the shape of the female die flange and the chamfer.
3. The electromagnetic flanging forming device according to claim 1 or 2, wherein when a plate to be formed is placed on the female die, the electromagnetic flanging forming device further comprises: pressing an edge block;
the edge pressing block is placed on the plate on the upper surface of the female die and provides edge pressing force for the plate so as to ensure that the position of the plate piece on the upper surface of the female die is unchanged in the hole flanging forming process of the plate.
4. The electromagnetic flanging forming apparatus according to claim 1 or 2, wherein the hollow cylinder above the boss is a cylinder to tightly nest the solenoid driving coil, and the shape of the hollow cylinder below the boss is determined by the flanging requirement of the workpiece.
5. The electromagnetic flanging forming apparatus according to claim 1 or 2, wherein the helical coil driving coil is wound on the outside of the hollow cylinder above the boss or on the inside of the hollow cylinder above the boss.
6. An electromagnetic flanging forming method is characterized by comprising the following steps:
selecting a magnetic field shaper which comprises a hollow cylinder and a circular boss; the circular boss is positioned on the outer side of the hollow cylinder;
winding a spiral tube driving coil on the hollow cylinder above the boss; after the spiral tube driving coil is electrified, an induction magnetic field is generated around the spiral tube driving coil;
selecting a female die, wherein the shape of the outer contour of the hollow cylinder below the boss is matched with that of the cavity of the female die; the boss is parallel to the upper plane of the female die;
when a plate to be flanged with a middle hole is placed on the female die, the lower end of the magnetic field shaper is gradually placed into the middle hole, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the plate, and the middle hole of the plate is driven to gradually flange towards the inner wall of the female die; the shape of the hole in the plate is matched with the shape of the outer contour of the hollow cylinder below the boss; gradually placing the lower end of the magnetic field shaper into the mesopore, specifically: the multi-step progressive flanging forming is carried out on the hole in the plate, the magnetic field shaper is moved downwards under the condition that the flanging forming is carried out on the plate in the previous step, and the gap between the magnetic field shaper and the hole in the plate is smaller than a preset value during each step of forming, so that the multi-step progressive flanging forming towards the inner wall of the female die of the hole in the plate is promoted;
when a pipe fitting to be flanged is placed in the female die, the shape of the pipe fitting is matched with the concave shape of the female die, a section of bulge is arranged above the upper surface of the female die, the lower end of the magnetic field shaper is gradually placed in a raised pipe fitting, so that the induction magnetic field is intensively distributed in a gap between the magnetic field shaper and the pipe fitting, and the raised pipe fitting is driven to be flanged and formed towards the upper surface of the female die gradually; gradually putting the lower end of the magnetic field shaper into the interior of the convex pipe fitting, specifically: and (3) multi-step progressive flanging and forming the pipe fitting, and moving the magnetic field shaper downwards under the condition of flanging and forming the raised pipe fitting in the previous step, so that the clearance between the magnetic field shaper and the inner wall of the pipe fitting is smaller than a preset value during each step of forming, and the raised pipe fitting is promoted to be flanged and formed towards the upper surface of the female die in a multi-step progressive manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011423101.1A CN112439827B (en) | 2020-12-08 | 2020-12-08 | Electromagnetic flanging forming device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011423101.1A CN112439827B (en) | 2020-12-08 | 2020-12-08 | Electromagnetic flanging forming device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112439827A CN112439827A (en) | 2021-03-05 |
| CN112439827B true CN112439827B (en) | 2021-08-10 |
Family
ID=74740345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011423101.1A Active CN112439827B (en) | 2020-12-08 | 2020-12-08 | Electromagnetic flanging forming device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112439827B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113059048B (en) * | 2021-03-23 | 2022-01-04 | 华中科技大学 | Precise forming device and method for micro deep-cavity shell part |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3747014B2 (en) * | 2002-07-09 | 2006-02-22 | 株式会社神戸製鋼所 | Electromagnetic forming method of coupling metal member, coupling metal member, and metal member joint |
| CN103861930B (en) * | 2014-04-01 | 2015-08-19 | 哈尔滨工业大学 | A kind of magnetic pulse formation device and method of aluminum alloy plate materials minor diameter flanging bore |
| CN106964684B (en) * | 2017-03-31 | 2019-05-31 | 华中科技大学 | A kind of complex multi-step local plastic electromagnetic forming method suitable for sheet material workpiece |
| CN108543847B (en) * | 2018-03-22 | 2020-04-24 | 中南大学 | Electromagnetic forming device and method for improving hole flanging limit and quality of plate |
| CN109865760B (en) * | 2018-12-19 | 2020-09-18 | 华中科技大学 | Electromagnetic forming device and method based on modular magnetic collector |
| CN109647963A (en) * | 2018-12-27 | 2019-04-19 | 华中科技大学 | A kind of electromagnetism orthopedic appliance and straightening method |
-
2020
- 2020-12-08 CN CN202011423101.1A patent/CN112439827B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112439827A (en) | 2021-03-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102125951B (en) | Method and device for laser pulse and electromagnetic pulse composite forming of metal sheet | |
| CN107584001B (en) | Electromagnetic forming method and device for metal plate | |
| CN106694681B (en) | A kind of electromagnetic forming device and method of metal tube | |
| CN102225491B (en) | Method and device for forming metal reducer pipe based on laser shock wave technology | |
| WO2022048198A1 (en) | Electromagnetic shape correction device and shape correction method | |
| CN111515291B (en) | Electromagnetic forming device and method for metal pipe fitting | |
| CN107139517B (en) | A kind of drawing and forming device and method of the non-axisymmetric parts of difficult-to-deformation material | |
| CN110193546B (en) | Device and method for forming metal plate by single-power-supply single-coil electromagnetic attraction | |
| CN107138591B (en) | Electromagnetic forming device and method for cylindrical part fillet | |
| CN106270104B (en) | A kind of magnetic field impulse hole flanging formation method of housing component | |
| CN103480751B (en) | Increment forming device and method for performing increment forming by utilizing increment forming device | |
| CN112439827B (en) | Electromagnetic flanging forming device and method | |
| CN206925192U (en) | A kind of electromagnetic forming device of metal tube | |
| CN105127284B (en) | Hierarchically-controlled electromagnetic incremental forming method | |
| CN104475531B (en) | A kind of sheet metal electromagnetic pulse local flow progressive molding device and method | |
| CN106964684B (en) | A kind of complex multi-step local plastic electromagnetic forming method suitable for sheet material workpiece | |
| CN103894472A (en) | Composite corrugated pipe forming device based on electromagnetic forming | |
| CN108097794B (en) | A kind of combination technological method of electromagnetism progressive preform and spinning finishing shape | |
| CN114770132B (en) | High-strength aluminum alloy melon petal side hole electromagnetic flanging device and method | |
| CN109909364B (en) | Metal sheet metal part die-free machining method | |
| CN208195342U (en) | A kind of Aluminum Alloy Tube staggeredly deforms electromagnetic connector | |
| CN113333561B (en) | Electromagnetic forming device and method based on conductive channel | |
| CN207577198U (en) | A kind of non-contact flaring of pipe fitting that need not be placed in inside pipe fitting or hemmer | |
| CN108480449B (en) | Staggered deformation electromagnetic connecting device and method for aluminum alloy pipe fittings | |
| CN113059048B (en) | Precise forming device and method for micro deep-cavity shell part |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |