CN107243529B - A kind of sheet forming device and manufacturing process reducing plate minimum bending radius - Google Patents
A kind of sheet forming device and manufacturing process reducing plate minimum bending radius Download PDFInfo
- Publication number
- CN107243529B CN107243529B CN201710504845.8A CN201710504845A CN107243529B CN 107243529 B CN107243529 B CN 107243529B CN 201710504845 A CN201710504845 A CN 201710504845A CN 107243529 B CN107243529 B CN 107243529B
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- coil
- plate
- pushes away
- side pushes
- recurvation
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Classifications
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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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
-
- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/10—Die sets; Pillar guides
Abstract
The invention discloses sheet forming devices and manufacturing process that one kind can reduce plate minimum bending radius, the device includes punch-pin, cavity plate, blank holder, pressing plate and power-supply system, the top of cavity plate is arranged in blank holder, bulging coil is embedded at the fillet of cavity plate, the top of cavity plate is embedded with the first side in the side far from fillet and pushes away coil, correspond to the first side on blank holder and push away and is embedded with second side at coil and pushes away coil, third side is embedded on cavity plate below fillet and pushes away coil, the lower part of punch-pin is embedded with the 4th side and pushes away coil, the recurvation coil for making the bending angle of plate that reversal deformation occur is embedded at the lower corners of pressing plate, power-supply system is bulging coil, first side pushes away coil, second side pushes away coil, third side pushes away coil, 4th side pushes away coil and recurvation coil power supply.The forming device can reduce the minimum bending radius extreme value of plate, avoid plate outer layer is curved from splitting, and can inhibit plate material to rebound.
Description
Technical field
The present invention relates to materials plastic forming technical fields, and in particular to one kind can reduce the plate of plate minimum bending radius
Expect forming device and manufacturing process.
Background technique
Bending is one of most common plastic deformation mode, is almost occurred in all sheet forming processes.When bending,
Side, that is, internal layer fiber in deformed area close to the center of curvature is tangentially pressurized, and generates compressive deformation；One far from the center of curvature
Side is the fiber tension in outside, generates elongation strain.With the reduction of relative bending radius R/t, bending deformation degree gradually increases
Add, the maximum tension deformation of layer side edge fiber also constantly increases.Keep the stretcher strain of layer side edge fiber super when R/t is reduced to
When crossing the permission deformation extent of material, buckling failure is eventually led to, and shows as plate outer layer by drawing crack, this moment bending of part
Radius is minimum bending radius.Curved in order to avoid part is split, and generally selecting plasticity, good material is bent.
But for the difficult-to-deformation material of the plasticity difference such as aluminium alloy, magnesium alloy, high-strength steel, the trend of sheet metal bending drawing crack is just more
Add obvious.Also, these difficult-to-deformation materials all have the characteristics that one it is common, i.e. rebound is big, and plate material to rebound schematic diagram is shown in Fig. 1.
After bending deformation, the bending radius that rebound will cause bool increases, thus be more difficult to obtain the template part of small-bend radius,
Limit the precision plastic forming of plate.
It is main at present to use following two mode: (1) nothing to be replaced using the bending with sizing for having bottom cavity plate for decreasing rebound
The free bend of bottom cavity plate.But bending with sizing can greatly increase the forming force of press machine, to propose more to press tonnage
High requirement, and be easy to generate destruction to mold and press machine；(2) stretch bending process is used.Along length while sheet metal bending
Direction applies pulling force, and whole deformation area is made to be in tensile stress state.But this needs to increase complicated stretch bending tooling, and stretch bending at
Sheet forming of the shape mainly for great circle angular radius.The bending of small fillet radius, plate outer layer are inherently answered by biggish drawing
Power, if applying tensile stress along plate length direction again, the outer layer tensile stress numerical value at sheet metal bending angle can become larger, it is easier to
It ruptures.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the shortcomings of to mention in background above technology and defect, provide one
Kind can reduce the minimum bending radius extreme value of plate, avoid plate outer layer is curved from splitting, and can inhibit the sheet forming dress of plate material to rebound
It sets and manufacturing process.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of sheet forming device reducing plate minimum bending radius, including punch-pin, cavity plate, blank holder, pressing plate and
The top of cavity plate is arranged in power-supply system, the blank holder, for plate to be formed to be clamped between cavity plate and blank holder,
Bulging coil is embedded at the fillet of cavity plate, the top of cavity plate is embedded with the first side in the side far from fillet and pushes away coil, described
Correspond to first side on blank holder and push away and be embedded with second side at coil and push away coil, is embedded below the fillet on cavity plate
There is third side to push away coil, the lower part of the punch-pin is embedded with the 4th side and pushes away coil, is embedded at the lower corners of the pressing plate useful
In making the bending angle of plate that the recurvation coil of reversal deformation occur, the power-supply system is the bulging coil, the first side pushes away line
Circle, second side pushes away coil, third side pushes away coil, the 4th side pushes away coil and recurvation coil power supply.
Electromagnetic pulse forming is a kind of method for carrying out High-speed machining to metal works using pulse magnet field force, is the following system
Make one of the key technology of industry.Material can be obtained under the conditions of pulse magnet field force high-speed deformation higher than under conventional ones processing
Forming property.The first side pushes away coil to forming device of the invention, second side pushes away coil, third side pushes away coil, the 4th by setting
Side pushes away coil and bulging coil, and punch-pin is pushed, by bulging coil discharge, plate fillet is in bulging electromagnetic force after sheet metal bending
Under the action of to moving far from die entrance direction, four sides push away the bending that two straight flanges of plate are pushed to plate by coil discharge
Angular zone, the tensile stress numerical value of outer layer, avoids curved split when can reduce bending angle bulging；By being arranged at the lower corners of pressing plate
Recurvation coil, after bulging coil discharge, recurvation coil discharge makes sheet metal bending angle that reversal deformation occur, and reduces and even disappears
Except plate material to rebound.The forming device can reduce the minimum bending radius extreme value of plate, avoid plate outer layer is curved from splitting, and can inhibit plate
Material rebound.
As further improvement to above-mentioned technical proposal:
Preferably, the power-supply system includes at least two power subsystems, and first side pushes away coil, second side pushes away line
Circle, third side pushes away coil, the 4th side pushes away coil and bulging coil is connected with the same power subsystem, the recurvation coil
It is connected with another power subsystem.In this way, conveniently pushing away coil to the first side, second side pushes away coil, third side pushes away coil, the 4th
Side pushes away coil and bulging coil while carrying out charge or discharge, operates more convenient.And recurvation coil and above-mentioned five coils are not
It discharges simultaneously, therefore it individually uses a power subsystem power supply.
Preferably, the power-supply system includes at least six power subsystems, and first side pushes away coil, second side pushes away line
Circle, third side pushes away coil, the 4th side pushes away coil, bulging coil and recurvation coil and is connected respectively with a power subsystem.
Preferably, first side pushes away coil, second side pushes away coil, third side pushes away coil, the 4th side pushes away coil, bulging line
Circle and recurvation coil are that single-layer or multi-layer section is round or rectangle red copper coil.
Preferably, first side pushes away coil, second side pushes away coil, third side pushes away coil, the 4th side pushes away coil, bulging line
Circle and recurvation coil are the coil being composed of more than one subcoil.
As a general technical idea, another aspect of the present invention, which provides one kind, can reduce plate minimum bending radius
Sheet forming method, this method are formed plate using above-mentioned sheet forming device, the specific steps of which are as follows:
S1, plate to be formed is placed on cavity plate, plate is clamped between cavity plate and blank holder with blank holder；
S2, punch-pin is placed on plate, and pressing plate is set in the top of punch-pin, pressing plate, which pushes, drives punch-pin to transport downwards
It is dynamic, bending forming is carried out to plate, stops pushing when the bottom surface that pressing plate presses to pressing plate is concordant with the bottom surface of blank holder, at this time
Recurvation coil faces at the fillet of cavity plate, and the 4th side, which pushes away coil and faces third side, pushes away coil, and it is corresponding that four sides push away coil
In the end of plate.The internal layer of plate bending angle is by circumferential compressive force after bending, and outer layer is by tangential stress.
S3, the first side push away coil, second side pushes away coil, third side pushes away coil, the 4th side pushes away coil and bulging coil discharge,
So that the direction far from die entrance bulging deformation occurs for the bending angle of plate under bulging electromagnetic force, make the curved of plate
Bilge radius strongly reduces, while the straight flange of plate realizes feed supplement of the plate straight flange to bending angle under the action of side pushes away electromagnetic force,
Avoid the thickness excessive thinning at sheet metal bending angle.After electric discharge, the internal layer at sheet metal bending angle by circumferential compressive force, outer layer by
Tangential stress.But since side pushes away the effect of electromagnetic force, the tangential stress numerical value of outer layer is reduced, curved split is avoided.
S4, recurvation coil discharge make the bending of plate so that the bending of plate is angularly moved close to the direction of die entrance
Reversal deformation occurs for angle, and the bending radius of plate increases by a small margin.This counter motion can be generated in the internal layer at sheet metal bending angle
Additional tangential stress, outer layer generate additional circumferential compressive force.This additional tangential stress and additional circumferential compressive force with
Original tangential stress is contrary on plate, so that the tangential stress numerical value on plate ectonexine be made to reduce, even is eliminated.And
The rebound of plate is related with bending caused by tangential stress on plate ectonexine, when tangential stress reduces or even eliminates, plate
The rebound of material will reduce or even eliminate.
Compared with the prior art, the advantages of the present invention are as follows:
(1) present invention pushes away coil by the way that four sides are arranged, and after punch-pin pushing makes sheet metal bending, four sides push away coil and are respectively positioned on
The end of plate after bending can generate side in plate end and push away electromagnetic force, be conducive to the curved of the straight flange push-in plate of plate
Bent angular zone, thus when reducing bending angle bulging outer layer tensile stress numerical value, avoid curved split.
(2) present invention is by being arranged recurvation coil in the lower part of pressing plate, after bulging occurs at plate fillet, the recurvation line
Circle electric discharge can make plate fillet that reversal deformation occur, and the stress state of fillet ectonexine be changed, to reduce or even eliminate back
Bullet realizes the accurate control shape of part.
(3) present invention carries out bending forming to plate using electromagnetic force, can be deformed using the high-speed of electro-magnetic forming special
Point improves the forming limit of material, is conducive to the bending radius for reducing part.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is the structural schematic diagram that springs back after sheet metal bending.
Fig. 2 is structural schematic diagram when forming device of the invention is in original state.
Fig. 3 is that forming device convex mould of the invention carries out structural schematic diagram after bending to plate.
Fig. 4 is the structural schematic diagram that side pushes away sheet forming after coil and bulging coil discharge in forming device of the invention.
Fig. 5 is the structural schematic diagram of sheet forming after recurvation coil discharge in forming device of the invention.
Fig. 6 is the magnetic that side pushes away plate end and radius area after coil and bulging coil discharge in forming device of the invention
Field force direction schematic diagram.
Fig. 7 is the magnetic field force direction schematic diagram of plate radius area after recurvation coil discharge in forming device of the invention.
Marginal data:
1, punch-pin；2, blank holder；3, cavity plate；4, pressing plate；5, plate；6, bulging coil；7, the first side pushes away coil；8, second
Side pushes away coil；9, third side pushes away coil；10, the 4th side pushes away coil；11, recurvation coil.
Specific embodiment
To facilitate the understanding of the present invention, the present invention is made below in conjunction with Figure of description and preferred embodiment more complete
Face meticulously describes, but the protection scope of the present invention is not limited to the following specific embodiments.
It should be strongly noted that when to be described as " be fixed on, be fixed in, be connected to or be connected to " another for a certain element
When on element, it can be directly fixed, affixed, connection or is connected on another element, be also possible to by connecting among other
Fitting is indirectly fixed, affixed, connects or is connected on another element.
Unless otherwise defined, all technical terms used hereinafter and the normally understood meaning of those skilled in the art
It is identical.Technical term used herein is intended merely to the purpose of description specific embodiment, is not intended to the limitation present invention
Protection scope.
Embodiment:
As shown in Figures 2 to 7, a kind of sheet forming device for reducing plate minimum bending radius of the invention, including
Punch-pin 1, cavity plate 3, blank holder 2, pressing plate 4 and power-supply system (not shown).Wherein, the upper of cavity plate 3 is arranged in blank holder 2
Side, for plate 5 to be formed to be clamped between cavity plate 3 and blank holder 2.Bulging coil 6 is embedded at the fillet of cavity plate 3.
The top of cavity plate 3 is embedded with the first side in the side far from fillet and pushes away coil 7.Correspond to the first side on blank holder 2 to push away at coil 7
It is embedded with second side and pushes away coil 8.Third side is embedded on cavity plate 3 below fillet and pushes away coil 9.The lower part of punch-pin 1 is embedded with
4th side pushes away coil 10.It is embedded with recurvation coil 11 at the lower corners of pressing plate 4, plate 5 can be made after the recurvation coil 11 electric discharge
Bending angle occur reversal deformation.Power-supply system is used for as bulging coil 6, the first side pushes away coil 7, second side pushes away coil 8, third
Side pushes away coil 9, the 4th side pushes away coil 10 and recurvation coil 11 is powered.
In the present embodiment, power-supply system can be at least two power subsystems, and the first side pushes away coil 7, second side pushes away line
Circle 8, third side pushes away coil 9, the 4th side pushes away coil 10 and bulging coil 6 and is connected with the same power subsystem therein,
And recurvation coil 11 is connected with another power subsystem.In addition to this, power-supply system can also be at least six power supply subsystems
System, the first side pushes away coil 7, second side pushes away coil 8, third side pushes away coil 9, the 4th side pushes away coil 10, bulging coil 6 and recurvation line
Circle 11 is connected with a power subsystem respectively.
In the present embodiment, the first side pushes away coil 7, second side pushes away coil 8, third side pushes away coil 9, the 4th side pushes away coil 10,
Bulging coil 6 and recurvation coil 11 preferably use the section of single layer or multilayer for round or rectangle red copper coil.More into
One step, the first side pushes away coil 7, second side pushes away coil 8, third side pushes away coil 9, the 4th side pushes away coil 10, bulging coil 6 and anti-
Curved line circle 11 is both preferably the coil being composed of more than one subcoil.
The application method of the sheet forming device is as follows:
Plate 5 to be formed is placed on cavity plate 3 by the first step, and plate 5 is clamped in cavity plate 3 and flanging with blank holder 2
Between circle 2.
Punch-pin 1 is placed on plate 5 by second step, and pressing plate 4 (such as Fig. 2) is arranged in the top of punch-pin 1, and pressing plate 4 pushes
It drives punch-pin 1 to move downward, bending forming is carried out to plate 5, the bottom surface of pressing plate 4 and the bottom surface of blank holder 2 are pressed to when pressing plate 4
Stop pushing when concordant, recurvation coil 11 faces at the fillet of cavity plate 3 at this time, and the 4th side, which pushes away coil 10 and faces third side, to push away
Coil 9 (such as Fig. 3).
Third step, the first side push away coil 7, second side pushes away coil 8, third side pushes away coil 9, the 4th side pushes away coil 10 and bulging
Coil 6 discharges, so that angularly bulging deformation, while the straight flange of plate 5 occur for the direction far from 3 fillet of cavity plate for the bending of plate 5
It is flowed to the bending angular direction of plate 5, realizes the feed supplement to 5 bending angle of plate, avoid bending angle is thinned (such as Fig. 4).
4th step, recurvation coil 11 discharge, so that the bending of plate 5 is angularly moved close to the direction of 3 fillet of cavity plate, make plate
Reversal deformation occurs for the bending angle of material 5, changes the ectonexine stress distribution of bending angle, thus reduce or even eliminate rebound, i.e., it is complete
The forming (such as Fig. 5) of pairs of plate 5.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. the sheet forming device that one kind can reduce plate minimum bending radius, it is characterised in that: including punch-pin (1), blank holder
(2), cavity plate (3), pressing plate (4) and power-supply system, blank holder (2) setting is used in the top of cavity plate (3) will be to be formed
Plate (5) is clamped between cavity plate (3) and blank holder (2), is embedded at the fillet of cavity plate (3) bulging coil (6), cavity plate (3)
Top be embedded with the first side in the side far from fillet and push away coil (7), first side is corresponded on the blank holder (2) and is pushed away
It is embedded with second side at coil (7) to push away coil (8), is embedded with third side below the fillet on cavity plate (3) and pushes away coil
(9), the lower part of the punch-pin (1) is embedded with the 4th side and pushes away coil (10), is embedded with and is used at the lower corners of the pressing plate (4)
Make the bending angle of plate (5) that the recurvation coil (11) of reversal deformation occur, the power-supply system is the bulging coil (6), the
Side pushes away coil (7), second side pushes away coil (8), third side pushes away coil (9), the 4th side pushes away coil (10) and recurvation coil (11)
Power supply.
2. the sheet forming device according to claim 1 for reducing plate minimum bending radius, it is characterised in that: described
Power-supply system includes at least two power subsystems, and first side pushes away coil (7), second side pushes away coil (8), third side pushes away line
Circle (9), the 4th side pushes away coil (10) and bulging coil (6) is connected with the same power subsystem, the recurvation coil
(11) it is connected with another power subsystem.
3. the sheet forming device according to claim 1 for reducing plate minimum bending radius, it is characterised in that: described
Power-supply system includes at least six power subsystems, and first side pushes away coil (7), second side pushes away coil (8), third side pushes away line
Circle (9), the 4th side push away coil (10), bulging coil (6) and recurvation coil (11) and are connected respectively with a power subsystem.
4. the sheet forming device described in any one of claim 1 to 3 for reducing plate minimum bending radius, special
Sign is: first side pushes away coil (7), second side pushes away coil (8), third side pushes away coil (9), the 4th side pushes away coil (10),
Bulging coil (6) and recurvation coil (11) are that single-layer or multi-layer section is round or rectangle red copper coil.
5. the sheet forming device described in any one of claim 1 to 3 for reducing plate minimum bending radius, special
Sign is: first side pushes away coil (7), second side pushes away coil (8), third side pushes away coil (9), the 4th side pushes away coil (10),
Bulging coil (6) and recurvation coil (11) are composed of more than one subcoil.
6. the sheet forming method that one kind can reduce plate minimum bending radius, it is characterised in that: using such as Claims 1 to 5
Any one of described in sheet forming device plate (5) is formed, the specific steps are as follows:
S1, plate (5) to be formed is placed on cavity plate (3), plate (5) is clamped in cavity plate (3) and pressure with blank holder (2)
Between flange (2)；
S2, punch-pin (1) is placed on plate (5), and pressing plate (4) is set in the top of punch-pin (1), pressing plate (4), which pushes, to be driven
Punch-pin (1) moves downward, and carries out bending forming to plate (5), when pressing plate (4) presses to the bottom surface and blank holder (2) of pressing plate (4)
Bottom surface it is concordant when stop push, recurvation coil (11) faces at the fillet of cavity plate (3) at this time, and the 4th side is pushing away coil (10) just
Coil (9) are pushed away against third side；
S3, the first side push away coil (7), second side pushes away coil (8), third side pushes away coil (9), the 4th side pushes away coil (10) and bulging
Coil (6) electric discharge, so that angularly bulging deformation, while plate occur for the direction far from cavity plate (3) fillet for the bending of plate (5)
(5) straight flange is flowed to the bending angular direction of plate (5)；
S4, recurvation coil (11) electric discharge make plate so that the bending of plate (5) is angularly moved close to the direction of cavity plate (3) fillet
(5) reversal deformation occurs for bending angle, to reduce or even eliminate rebound, that is, completes the forming to plate (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710504845.8A CN107243529B (en) | 2017-06-27 | 2017-06-27 | A kind of sheet forming device and manufacturing process reducing plate minimum bending radius |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710504845.8A CN107243529B (en) | 2017-06-27 | 2017-06-27 | A kind of sheet forming device and manufacturing process reducing plate minimum bending radius |
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| CN107243529A CN107243529A (en) | 2017-10-13 |
| CN107243529B true CN107243529B (en) | 2019-01-15 |
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| CN110523834A (en) * | 2019-04-18 | 2019-12-03 | 中南大学 | A kind of plate electromagnetism auxiliary bending forming method for controlling springback and device |
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|---|---|---|---|---|
| JP2011194473A (en) * | 2011-04-27 | 2011-10-06 | Kobe Steel Ltd | Inductor for electromagnetic forming and method for manufacturing the same |
| CN103658297A (en) * | 2013-09-13 | 2014-03-26 | 华中科技大学 | Electromagnetic pulse boosting type gradual deep drawing forming method and device |
| CN103861930A (en) * | 2014-04-01 | 2014-06-18 | 哈尔滨工业大学 | Device and method for forming small-diameter flanging holes in aluminum alloy plate through magnetic pulses |
| CN104353718A (en) * | 2014-10-17 | 2015-02-18 | 华中科技大学 | Plate packaging and drawing forming device and forming method |
| CN104475531A (en) * | 2014-11-18 | 2015-04-01 | 华中科技大学 | Metal plate electromagnetic pulse local flow incremental forming device and method |
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2017
- 2017-06-27 CN CN201710504845.8A patent/CN107243529B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011194473A (en) * | 2011-04-27 | 2011-10-06 | Kobe Steel Ltd | Inductor for electromagnetic forming and method for manufacturing the same |
| CN103658297A (en) * | 2013-09-13 | 2014-03-26 | 华中科技大学 | Electromagnetic pulse boosting type gradual deep drawing forming method and device |
| CN103861930A (en) * | 2014-04-01 | 2014-06-18 | 哈尔滨工业大学 | Device and method for forming small-diameter flanging holes in aluminum alloy plate through magnetic pulses |
| CN104353718A (en) * | 2014-10-17 | 2015-02-18 | 华中科技大学 | Plate packaging and drawing forming device and forming method |
| CN104475531A (en) * | 2014-11-18 | 2015-04-01 | 华中科技大学 | Metal plate electromagnetic pulse local flow incremental forming device and method |
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