CN108787848B - A kind of the magnetic field impulse bending apparatus and manufacturing process of the rebound of control U-shaped part - Google Patents
A kind of the magnetic field impulse bending apparatus and manufacturing process of the rebound of control U-shaped part Download PDFInfo
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- CN108787848B CN108787848B CN201810542534.5A CN201810542534A CN108787848B CN 108787848 B CN108787848 B CN 108787848B CN 201810542534 A CN201810542534 A CN 201810542534A CN 108787848 B CN108787848 B CN 108787848B
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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
Abstract
The invention belongs to metal sheet forming fields, and specifically disclose the magnetic field impulse bending apparatus and manufacturing process of a kind of control U-shaped part rebound, the bending apparatus includes forming unit, compressing unit and adjusting unit, forming unit includes punch-pin and electro-magnetic forming component, punch-pin is used to carry out magnetic field impulse bending forming to plate for controlling plate to be formed curved shape, electro-magnetic forming component；Compressing unit is used to for pressing force being applied to the central area of U-shaped part bottom；Unit is adjusted for adjusting position of the electro-magnetic forming component relative to plate to be formed.The manufacturing process carries out two step magnetic field impulse bending formings using the magnetic field impulse bending apparatus, completes the bending forming of U-shaped part.The rebound phenomenon after U-shaped part bending forming can be effectively controlled in the present invention, greatlies simplify mould structure and process flow.
Description
Technical field
The invention belongs to metal sheet forming fields, are bent more particularly, to a kind of magnetic field impulse of control U-shaped part rebound
Device and manufacturing process.
Background technique
It is bent normal method as sheet forming, the pass of the forming quality of bool by researcher and production plant
Note, and springing back is inevitable defect in bending process, has seriously affected the forming accuracy of bool, has carried out to it effectively
Prediction and control are the key that improve bool precision.
Traditional bending forming process mainly uses trial-and-error method and excessively curved method to carry out industrial analysis and mold design, by more
It is secondary to debug and repair a die to control the forming accuracy of bool, the extension of production cycle is caused, the raising of production cost is increasingly difficult to
To meet high degree of automation, the manufacturing requirements of wide adaptability.For example, to disclose a kind of U-shaped part curved by CN106345910A
Song rebound mould and its working method are eliminated the bending springback when processing of U-shaped part by the design of mould structure, improve production
Efficiency；CN203955925U discloses a kind of U-shaped part bending sizing die, makes the two of U-shaped product by the design of mould structure
Side stress eliminates the residual stress of U-shaped product two sides, avoids the rebound of product.However the structure of above-mentioned shaping dies is more
Complexity, fabrication cycle is long, high production cost, and U-shaped part still has rebound.Therefore, it still needs to be studied effectively to control
Bool is sprung back on the basis of defect, simplifies mold design and process flow, reduces production time and cost, high-quality to meet
Change, the needs of rapid production.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of magnetic arteries and veins of control U-shaped part rebound
Bending apparatus and manufacturing process are rushed, in conjunction with the bending deformation of U-shaped part and springback process mechanical characteristic, is shaped, will be pressed based on punch-pin
Tight unit is placed on U-shaped part bottom centre position of the rebound without influence, is bending driving force with electromagnetic force, is bent to using two steps
Shape realizes the deformation process that loading-unloading-reloads, and guarantees that U-shaped part discharges the bullet accumulated in loading procedure in uninstall process
Property deformation, thus effectively control U-shaped part bending forming after rebound phenomenon, greatly simplify mould structure and process flow.
To achieve the above object, according to one aspect of the present invention, the magnetic field impulse for proposing a kind of control U-shaped part rebound is curved
Bent device comprising forming unit, compressing unit and adjusting unit, in which:
The forming unit includes punch-pin and electro-magnetic forming component, which is used to control the Curved of plate to be formed
Shape, the electro-magnetic forming component are used to carry out plate to be formed the U-shaped part needed for magnetic field impulse bending forming obtains；
The compressing unit is located at the top of plate to be formed, and is located at the center of punch-pin, and pressing force is applied to U-shaped
The central area of part bottom；
The adjusting unit is connected with the electro-magnetic forming component, for adjusting electro-magnetic forming component relative to plate to be formed
The position of material.
As it is further preferred that the electro-magnetic forming component includes form-wound coil and fills for realizing the form-wound coil
The electro-magnetic forming electric discharge device of electricity and electric discharge, the form-wound coil are located at the top of plate to be formed, are mounted on company by sliding block
On bar, which is connected with the adjusting unit；The adjusting unit is specially three-dimensional mobile platform.
As it is further preferred that the compressing unit includes compact heap and for providing pressing force for the compact heap
Hydraulic device, which is placed in the center of punch-pin under the action of hydraulic device, and pressing force is applied in U-shaped part bottom
Heart district domain.
As it is further preferred that two form-wound coils are with punch-pin center in left and right there are two form-wound coil settings
Symmetrical, it is multi-layer planar coil that two form-wound coil structures are identical.
As it is further preferred that the magnetic field impulse bending apparatus to plate to be formed carry out two step magnetic field impulse bending formings,
Realize that the bending loading-unloading-of plate reloads process.
It is another aspect of this invention to provide that providing a kind of U-shaped part magnetic field impulse bending forming method, which is characterized in that adopt
Two step magnetic field impulse bending formings are carried out with the magnetic field impulse bending apparatus.
As it is further preferred that including the following steps:
Plate to be bent is placed in the top surface of punch-pin by S1, and compact heap is placed on plate, in guarantee punch-pin center, plate
The heart and compact heap center are overlapped, and control hydraulic device makes compact heap compress plate；
S2 control three-dimensional mobile platform is moved to form-wound coil above plate, and makes two shaped wires by adjusting slider
Circle is with the symmetrical distribution in plate center；
S3 controls the realization of electro-magnetic forming electric discharge device to the charging and discharging process of form-wound coil, completes first step magnetic field impulse
Bending forming realizes the bending load of plate；
S4 plate freely discharges the flexible deformation added up in bending process after the bending load of first step magnetic field impulse, realizes plate
The uninstall process of material；
S5 control three-dimensional mobile platform makes form-wound coil vertical downward movement, and guarantees upper surface and the punch-pin of form-wound coil
Upper surface in same level；
S6 controls electro-magnetic forming electric discharge device and charges and discharges process to form-wound coil, and it is curved to complete second step magnetic field impulse
Song forming, realizes that the bending of plate reloads, and the U-bend for thus completing plate is bent.
As it is further preferred that the plate to be bent with a thickness of 0.5mm~8mm, width be 10mm~
500mm, length are 100mm~1000mm；The radius of corner of the punch-pin is 2mm~50mm, corresponding sheet metal bending fillet
Radius is 2mm~50mm.
As it is further preferred that in step sl, the pressing force that the hydraulic device provides is 3KN~30KN；In step
In rapid S2, distance of the form-wound coil apart from plate upper surface is 1~3mm；The distance between two form-wound coils than at
2~6mm of bottom side length of shape U-shaped part.
As it is further preferred that in step s3, the discharge voltage of first order bends forming is 10KV~30KV；In step
In rapid S4, the discharge voltage of second order bends forming is 3KV~10KV.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, mainly have below
Technological merit:
1. the present invention combines the bending deformation of U-shaped part and springback process mechanical characteristic, is shaped based on punch-pin, compressing unit is set
In springing back the bottom centre position without influence to U-shaped part, to not interfere the unloading phase of plate release flexible deformation, guarantee curved
Effective progress of bent uninstall process.
2. using electromagnetic force as driving force in bending process of the invention, plate realize under the action of electromagnetic force high-speed at
Shape, improve the forming limit of material, it can be achieved that high depth, small round corner U-shaped part bending forming.
3. the present invention uses two step magnetic field impulse bending process, realizes the bending process that U-shaped part loading-unloading-reloads, make
Workpiece discharges flexible deformation in forming process, to control the rebound that generates after the bending unloading of U-shaped part, guarantee U-shaped part at
Shape precision.
3. the present invention is based on punch-pin forming, it can be achieved that the bending of different-thickness plate, overcomes traditional U-shaped bending mould one
Mold can only be bent a kind of defect of thickness plate, improve technique applicability, it can be achieved that with a thickness of 0.5mm~8mm plate
Effective bending forming of material.
4. the present invention is combined by punch-pin forming and electromagnetism power drive, greatly simplify bending mould tooling, effectively
Shorten molding and die trial period, reduces production cost.
5. the present invention is bent by magnetic field impulse, contact and friction of the workpiece with punch-pin are avoided, without using lubricant, is improved
The quality on bool surface.
6. the present invention makes form-wound coil apart from plate upper surface by research before first step magnetic field impulse bending forming
Distance is 1~3mm, it is made to be less than electro-magnetic forming skin depth, guarantees to generate induced current in plate, realizes first step magnetic field impulse
Bending.
7. the present invention is by research so that the shortest distance of two form-wound coils is longer by 2 than the length on U-shaped part to be formed bottom edge
Thus~6mm makes plate and form-wound coil side wall in second order bends forming process keep suitable distance, to guarantee plate
Middle generation induced current realizes the bending of second step magnetic field impulse.
8. the present invention by research so that first order bends forming discharge voltage be 10KV~30KV, second order bends at
The discharge voltage of shape is 3KV~10KV, in above-mentioned discharge voltage range, can effectively avoid plate and punch-pin collides instead
Bullet realizes the smooth pad pasting of plate.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the magnetic field impulse bending apparatus of control U-shaped part rebound provided in an embodiment of the present invention；
Fig. 2 is first step magnetic field impulse bending forming schematic diagram constructed by embodiment according to the invention；
Fig. 3 is second step magnetic field impulse bending forming schematic diagram constructed by embodiment according to the invention.
1- punch-pin, 2- plate, 3- form-wound coil, 4- sliding block, 5- connecting rod, 6- hydraulic device, 7- compact heap, 8- three-dimensional are mobile
Platform, 9- electro-magnetic forming electric discharge device, 10- punch-pin upper surface, 11- form-wound coil upper surface.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
As shown in Figure 1, a kind of magnetic field impulse bending apparatus of control U-shaped part rebound provided in an embodiment of the present invention, including at
Shape unit, compressing unit and adjusting unit, wherein magnetic field impulse bending forming of the forming unit for realizing U-shaped part, compressing unit
For realizing compression and fixation of the plate to be bent in forming process, unit is adjusted for adjusting forming unit relative to be curved
The position of bent plate material, convenient for preferably realizing magnetic field impulse bending forming.Pass through the mutual cooperation of above-mentioned each unit, it is ensured that U
Shape part discharges the flexible deformation accumulated in loading procedure in forming process, thus after the bending forming of effectively control U-shaped part
Rebound phenomenon greatlies simplify mould structure and process flow.
As shown in Figure 1, forming unit includes punch-pin 1 and electro-magnetic forming component, the punch-pin 1 is for controlling plate to be formed 2
Curved shape, the electro-magnetic forming component be used for plate to be formed carry out magnetic field impulse bending forming obtain needed for U-shaped part.Tool
Body, electro-magnetic forming component includes that form-wound coil 3 and the electro-magnetic forming electric discharge being charged and discharged for realizing the form-wound coil 3 fill
9 are set, which is located at the top of plate to be formed 2, is mounted on connecting rod 5 by sliding block 4, and the connecting rod 5 and adjusting are single
Member is connected.
As shown in Figure 1, compressing unit is located at the top of plate to be formed, and it is located at the center of punch-pin 1 comprising compact heap
7 and for providing the hydraulic device 6 of pressing force for the compact heap, which is placed in punch-pin under the action of hydraulic device 6
The unloading of the release flexible deformation of plate is not interfered to guarantee pressing force being applied to U-shaped part bottom center region in 1 center
Stage guarantees effective progress of bending uninstall process.
As shown in Figure 1, adjusting unit for adjusting position of the electro-magnetic forming component relative to plate to be formed, it is specially
Three-dimensional mobile platform 8, the three-dimensional mobile platform 8 are connected with electro-magnetic forming component, specifically connect the connecting rod 5, and connecting rod 5 leads to again
It crosses sliding block 4 to be connected with form-wound coil, which is connected with electro-magnetic forming electric discharge device 9 again.
For the ease of the valid shaping of U-shaped part, guarantee forming quality, there are two the settings of form-wound coil 3, as shown in Figure 1, two
For a form-wound coil about the symmetrical distribution in punch-pin center, it is multi-layer planar coil that two form-wound coil structures are identical,
And two form-wound coils pass through sliding block 4 and are connected with connecting rod 5, which can do level relative to connecting rod 5 and horizontally slip, and lead to
Level sliding of the sliding block relative to connecting rod is crossed, form-wound coil can be driven to move horizontally, adjusted opposite between two form-wound coils
Position.I.e. the upright position of form-wound coil is adjusted by three-dimensional mobile platform, and horizontal relative position is adjusted by sliding block.
The present invention also provides a kind of U-shaped part magnetic field impulse bending forming methods, are bent dress using magnetic field impulse of the invention
It sets and carries out U-shaped part magnetic field impulse bending forming, including the following steps:
Plate to be bent such as aluminium alloy, magnesium alloy, copper alloy plate are placed in the top surface of punch-pin by S1, and compact heap is set
In on plate, guaranteeing that punch-pin center, plate center and compact heap center are overlapped, hydraulic device is controlled as compact heap, compression is provided
Power makes compact heap compress plate, and to fix plate, the pressing force that hydraulic device provides is 3KN~30KN, guarantees plate curved
Bottom does not loosen during song；
S2 control three-dimensional mobile platform is moved to form-wound coil above plate, it is ensured that form-wound coil is in preferably electric discharge
Position, and make two form-wound coils about the symmetrical distribution in plate center by adjusting two sliding blocks, wherein form-wound coil
Distance of the lower surface apart from plate upper surface be in preferable discharge position when being 1~3mm, between two form-wound coils most
Short distance (i.e. the shortest distance between two form-wound coil side walls) is 2~6mm longer than the length on U-shaped part to be formed bottom edge；
S3 controls the realization of electro-magnetic forming electric discharge device to the charging and discharging process of form-wound coil, completes first step magnetic field impulse
Bending forming realizes the bending load of plate, and wherein discharge voltage is 10KV~30KV；
S4 plate is after the bending load of first step magnetic field impulse, and since fillet area and straight wall area are all not affected by constraint, plate will
The flexible deformation added up in bending process is freely discharged, realizes the unloading of plate；
S5 control three-dimensional mobile platform makes form-wound coil vertical downward movement, and guarantees upper surface and the punch-pin of form-wound coil
Upper surface in same level, to guarantee form-wound coil and plate is in preferable discharge position, to realize fillet and side
The electro-magnetic forming of wall；
S6 controls electro-magnetic forming electric discharge device and charges and discharges process to form-wound coil, and it is curved to complete second step magnetic field impulse
Song forming, realizes that the bending of plate reloads, and the U-bend for thus completing plate is bent, and control U-shaped part rebound guarantees forming quality,
Wherein discharge voltage is 3KV~10KV.
Specifically, plate to be bent with a thickness of 0.5mm~8mm, width is 10mm~500mm, length be 100mm~
1000mm；The radius of corner of punch-pin is 2mm~50mm, and corresponding sheet metal bending radius of corner is 2mm~50mm.
The following is an embodiment of the present invention:
Embodiment 1
The length of plate to be bent is 400mm, width 150mm in the present embodiment, with a thickness of 1.5mm, punch-pin bending circle
Angular radius is 10mm, target U-shaped the part a length of 190mm in bottom edge, length of straight flange 90mm.In the present embodiment, shaped based on punch-pin
Magnetic field impulse bending control U-shaped part rebound process mainly comprise the steps that
1) plate 2 is placed on punch-pin 1, compact heap 7 is placed on plate, guarantee punch-pin center, plate center, compact heap
Center is overlapped, and controls hydraulic device 6, so that it is provided compact heap 20KN pressing force, to fix plate；
2) three-dimensional mobile platform is adjusted, moves vertically to form-wound coil at the 3mm of plate upper surface, to ensure to shape
Coil is in preferable discharge position, and adjusting left and right sliding block is symmetric left and right form-wound coil with plate center, and left,
Distance is 195mm between right form-wound coil, as shown in Figure 1；
3) electro-magnetic forming electric discharge device is controlled, charging process and discharge process are carried out to form-wound coil, wherein discharge voltage
For 12KV, first step magnetic field impulse bending forming is completed, realizes the bending load of plate；
4) plate, since fillet area and straight wall area are all not affected by constraint, is freely released after the bending load of first step magnetic field impulse
The flexible deformation added up in bending process is put, realizes the unloading phase of plate, plate state is as shown in Figure 2；
5) three-dimensional mobile platform is operated, form-wound coil is vertically moved, guarantees the upper of the upper surface 11 of form-wound coil and punch-pin
End face 10 is parallel, and actuating coil position is as shown in Figure 2；
6) electro-magnetic forming electric discharge device is operated, process is charged and discharged to form-wound coil, wherein discharge voltage is
6KV, complete second step magnetic field impulse bending forming, realize that the bending of plate reloads, the final shaped state of plate as shown in figure 3,
Thus the U-bend for completing plate is bent.
Present invention combination U-shaped part bending deformation and springback process mechanical characteristic are shaped based on punch-pin, and compact heap is placed in pair
U-shaped part springs back the bottom centre position without influence, and uses two step magnetic field impulse bending process, realizes U-shaped part loading-unloading-again
The bending process of load, makes workpiece discharge flexible deformation in forming process, so that is generated after controlling the bending unloading of U-shaped part returns
Bullet guarantees the precision of forming；Using electromagnetic force as driving force in bending process, improve the forming limit of material, it can be achieved that high depth,
The U-shaped part bending forming of small round corner, and contact and friction of the workpiece with punch-pin are avoided, improve the quality on bool surface；It is based on
Punch-pin shapes the bending, it can be achieved that different-thickness plate, improves technique applicability；Pass through punch-pin forming and electromagnetism power drive phase
In conjunction with, greatly simplify bending mould tooling, it is effective to shorten molding and die trial period, reduce production cost.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of magnetic field impulse bending apparatus of control U-shaped part rebound, which is characterized in that the magnetic field impulse bending apparatus treats forming board
Material carries out two step magnetic field impulse bending formings, realizes that the bending loading-unloading-of plate reloads process, including forming unit, compression
Unit and adjusting unit, in which:
The forming unit includes punch-pin (1) and electro-magnetic forming component, which is used to control the Curved of plate to be formed
Shape, the electro-magnetic forming component are used to carry out plate to be formed the U-shaped part needed for magnetic field impulse bending forming obtains；
The compressing unit is located at the top of plate to be formed, and is located at the center of punch-pin (1), and pressing force is applied to U-shaped
The central area of part bottom；
The adjusting unit is connected with the electro-magnetic forming component, for adjusting electro-magnetic forming component relative to plate to be formed
Position.
2. the magnetic field impulse bending apparatus of control U-shaped part rebound as described in claim 1, which is characterized in that the electro-magnetic forming
Component include form-wound coil (3) and for realizing the form-wound coil (3) be charged and discharged electro-magnetic forming electric discharge device (9),
The form-wound coil (3) is located at the top of plate to be formed, is mounted on connecting rod (5) by sliding block (4), the connecting rod (5) and institute
Adjusting unit is stated to be connected；The adjusting unit is specially three-dimensional mobile platform (8).
3. the magnetic field impulse bending apparatus of control U-shaped part rebound as described in claim 1, which is characterized in that the compressing unit
Including compact heap (7) and for providing the hydraulic device (6) of pressing force for the compact heap, the compact heap (7) is in hydraulic device (6)
Under the action of be placed in the center of punch-pin (1), and pressing force is applied to U-shaped part bottom center region.
4. the magnetic field impulse bending apparatus of control U-shaped part rebound as claimed in claim 2, which is characterized in that the form-wound coil
(3) there are two setting, for two form-wound coils about the symmetrical distribution in punch-pin center, two form-wound coil structures are identical,
It is multi-layer planar coil.
5. a kind of U-shaped part magnetic field impulse bending forming method, which is characterized in that use magnetic according to any one of claims 1-4
Pulse bending apparatus carries out two step magnetic field impulse bending formings.
6. manufacturing process as claimed in claim 5, characterized in that it comprises the following steps:
Plate to be formed is placed in the top surface of punch-pin by S1, and compact heap is placed on plate, guarantees punch-pin center, plate center and pressure
Tight block center is overlapped, and control hydraulic device makes compact heap compress plate；
S2 control three-dimensional mobile platform is moved to form-wound coil above plate, and by adjusting slider make two form-wound coils with
The symmetrical distribution in plate center；
S3 controls the realization of electro-magnetic forming electric discharge device to the charging and discharging process of form-wound coil, completes the bending of first step magnetic field impulse
The bending load of plate is realized in forming；
S4 plate freely discharges the flexible deformation added up in bending process after the bending load of first step magnetic field impulse, realizes plate
Uninstall process；
S5 control three-dimensional mobile platform make form-wound coil vertical downward movement, and guarantee form-wound coil upper surface and punch-pin it is upper
End face is in same level；
S6 controls electro-magnetic forming electric discharge device and charges and discharges process to form-wound coil, completes second step magnetic field impulse and bends to
Shape realizes that the bending of plate reloads, and the U-bend for thus completing plate is bent.
7. manufacturing process as claimed in claim 5, which is characterized in that the plate to be formed with a thickness of 0.5mm~8mm,
Width is 10mm~500mm, and length is 100mm~1000mm；The radius of corner of the punch-pin is 2mm~50mm, corresponding
Sheet metal bending radius of corner is 2mm~50mm.
8. manufacturing process as claimed in claim 6, which is characterized in that in step sl, the compression that the hydraulic device provides
Power is 3KN~30KN；In step s 2, distance of the form-wound coil apart from plate upper surface is 1~3mm；Two shaped wires
The distance between circle is 2~6mm longer than the bottom edge length for the U-shaped part that final forming obtains.
9. manufacturing process as claimed in claim 6, which is characterized in that in step s3, first step magnetic field impulse bending forming
Discharge voltage is 10KV~30KV；In step s 6, the discharge voltage of second step magnetic field impulse bending forming is 3KV~10KV.
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| CN201810542534.5A CN108787848B (en) | 2018-05-30 | 2018-05-30 | A kind of the magnetic field impulse bending apparatus and manufacturing process of the rebound of control U-shaped part |
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| CN201810542534.5A CN108787848B (en) | 2018-05-30 | 2018-05-30 | A kind of the magnetic field impulse bending apparatus and manufacturing process of the rebound of control U-shaped part |
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| JP4111028B2 (en) * | 2003-03-25 | 2008-07-02 | 日産自動車株式会社 | Hydraulic forming method for tubular body |
| CN2887479Y (en) * | 2006-03-07 | 2007-04-11 | 华中科技大学 | Moving electromagnetic coil device for gradual panel forming |
| JP5934272B2 (en) * | 2014-03-20 | 2016-06-15 | 富士重工業株式会社 | Hot press deep drawing method and apparatus |
| CN104475531B (en) * | 2014-11-18 | 2016-04-13 | 华中科技大学 | A kind of sheet metal electromagnetic pulse local flow progressive molding device and method |
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