CN110000283A - A kind of small round corner box part accurate forming method and its forming device - Google Patents
A kind of small round corner box part accurate forming method and its forming device Download PDFInfo
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- CN110000283A CN110000283A CN201811362931.0A CN201811362931A CN110000283A CN 110000283 A CN110000283 A CN 110000283A CN 201811362931 A CN201811362931 A CN 201811362931A CN 110000283 A CN110000283 A CN 110000283A
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- plate
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- forming
- cavity
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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
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- 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
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/021—Deforming sheet bodies
-
- 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
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The present invention provides a kind of small round corner box part accurate forming method and its forming devices, and the combined shaping of preform and electro-hydraulic forming may be implemented.As shown in Figure 1, being mainly made of punch-pin, buckling circle, positioning plate and several parts of cavity plate.Punch-pin is box-shaped, and discharge electrode pair, outer even high voltage discharge circuit are installed on four angles of punch-pin.Manufacturing process is broadly divided into two steps of preform and fillet electro-hydraulic forming, makes fillet be bonded mold according to the principle of electro-hydraulic forming.The method mainly utilizes the Accurate Shaping of electro-hydraulic forming realization small round corner, due to using liquid medium power transmission, therefore can be used for processing the complicated fillet that can not be shaped with conventional rigid punch and matrix, then can realize shaping for various parts with different preliminary shaping methods is closed, have a wide range of application.
Description
Technical field
The invention belongs to metal material processing technical fields, specifically refer to a kind of small round corner box part accurate forming method
And its forming device.
Background technique
The problem of traditional deep-drawing technique produces cylindrical part, is easy to appear planar flange portion corrugation and barrel drawing crack.
The corrugation of planar flange portion refers to that in drawing process, some materials tangentially generate wavy arch upward.Wrinkling
When slight, material can be squeezed flat when flowing into clearance between matrix and punch by punch and matrix；When wrinkling is serious, corrugated material can not be by
Punch and matrix squeezes flat, dangerous end face will be caused to rupture because of sharply increasing for drawing pressure when continuing drawing, though pulled in by force it is convex,
Cavity plate gap also can leave wrinkle line or groove mark in drawing part barrel, influence the surface quality of drawing part.
By the stress-strain analysis to drawing process, bowl wall portion can be approximately considered by unidirectional action of pulling stress.Deformation
When beginning, the thinning maximum of embryo material at cavity plate mouth, when starting packet to punch-nose angle close to the material drawing of die entrance, along punch-pin
Fillet bends and bulging deformation, continues its thickness thinning.Drawing part is formd in straight wall intersection in punch-nose angle
One thickness minimum；And second minimum for forming drawing part thickness is thinned after alternating bending occurs in die entrance once again.
When drawing pressure is excessive, and the stress of barrel material reaches ultimate tension, barrel will be by drawing crack.Due in bowl wall portion and bottom
The thickness of the neighbouring material of the interface of portion fillet part is most thin, hardness is minimum, thus is the critical section that drawing crack occurs at this.It draws
The drawing crack of deep part commonly takes place in critical section.
There are materials, and serious hold is thinned in drawing process for plate for the Chinese patent of Publication No. CN104353718A
The problems such as easily rupturable and forming height is shallow proposes that a kind of plate packet is drawn forming device and carried out the side of drawing and forming using the device
Method is made the plate region of the fillet face of cavity plate that bending occur and is bulged by the setting electromagnetic discharge coil at the fillet of cavity plate,
Cylindrical member is shaped by the method that substep electric discharge makes plate gradually wrap up punch-pin.Compared with common drawing, plate packet pulls into shape work
Skill improves the mobility of the flange portion material of plate, greatly improves Sheet drawing Forming depth, but this method is not
Have and solves female bottom fillet position Problems in forming.
In document " 5052 aluminum alloy plate materials electromagnetically assisted sheet metal stampings shape deformational behavior and mechanism study ", domestic Ha Er
The Liu great Hai etc. of shore polytechnical university, which is proposed, assists Sheet Metal Forming Technology using electromagnetism to realize the forming of small fillet radius cylindrical part.
The thinking of the technique are as follows: the cylindrical member profile with larger bottom roundings is shaped using the biggish punch-pin of radius of corner first,
Then the electric discharge of bottom roundings position is reshaped using the mould structure embedded with coil again.Compared with common punching press, magnetic field impulse is auxiliary
It helps forming technology that can significantly improve bottom roundings Problems in forming, obtains the small fillet radius tubular that common method for drawing is difficult to
Part, but in electromagnetic pulse auxiliary is stamping, it needs to carry out drawing preform to plate first, and electromagnetic coil is only to work
The local stagnant zone domain electric discharge school shape of part, this allows for sheet material forming performance and is largely determined by deep-drawing technique, and
This method does not solve the flow field problem of the material of the flange portion of plate, it is difficult to increase substantially the Forming depth of material.
Therefore, a kind of new cylindrical part forming technology is designed, both can solve traditional deep-drawing technique bring corrugation and is broken
Problem is split, and female bottom fillet forming property can be improved, to complex-shaped, there is the production of the part of difficult processing fillet to have
Far reaching significance.
Summary of the invention
The present invention in order to solve problems in the prior art, provide a kind of small round corner box part accurate forming method and its at
Shape dress is set, and the technical solution is as follows:
On the one hand, a kind of small round corner box part Accurate Shaping device is provided, including punch-pin, blank holder, positioning plate, recessed
Mould, equipped with four pairs, totally eight electrodes, the polar curve of each pair of electrode correspond to female bottom in 90 ° of arrangements for the punch-pin bottom end
Four fillets；The punch-pin center is machined with the hole (17) and hole (18) interpenetrated, for leading to liquid；The plate is placed in
Between positioning plate and cavity plate；There is matrix cavity identical with formation of parts shape on the cavity plate, bottom is provided with aperture.
Optionally, sealing ring is provided between the blank holder and punch-pin；
Optionally, sealing ring is provided between the blank holder and positioning plate；
Optionally, sealing ring is provided between the positioning plate and plate；
Optionally, sealing ring is provided between the plate and cavity plate；
On the other hand, a kind of small round corner box part accurate forming method is provided, comprising the following steps:
1) plate to be processed is fixed between cavity plate and positioning plate；
2) blank holder moves down, until blank holder lower end surface is bonded positioning plate upper surface and compresses under pressure-pad-force effect；
3) preliminary shaping method suitable according to the selection of the processing request of part；
4) after to plate preform, mobile punch-pin makes between punch-pin and drawing part that there are certain intervals, passes through punch-pin
The intracorporal air of closed chamber between punch-pin and drawing part is drained and is led to full liquid by interior channel, guarantees that liquid did not had electrode；
5) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure act on close
On the plate in four corners of cavity plate, it is allowed to be fitted in the forming of female bottom fillet.
Wherein, the preliminary shaping method suitable according to the selection of the processing request of part specifically:
1) for shaping part of less demanding, to reduce cost and improving efficiency, direct rigid convex die drawing is selected
It is deep；
2) part biggish for drawing depth is applicable in hydro-mechanical drawing preform；
3) part higher for surface quality requirements, can choose hydraulic expanding-forming preform.
Wherein, preform selects the specific steps of direct rigid convex die drawing depth are as follows:
1) plate to be processed is fixed between cavity plate and positioning plate；
2) blank holder moves down, until blank holder lower end surface is bonded positioning plate upper surface and compresses under pressure-pad-force effect；
3) matrix cavity is vacuumized；
4) punch-pin downlink, by sheet metal deep drawing into matrix cavity；
5) after drawing preform, move up punch-pin certain distance, by the channel in punch-pin by punch-pin and drawing part it
Between the intracorporal air of closed chamber drain and lead to full liquid, guarantee that liquid did not had electrode；
6) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure act on close
On the plate in four corners of cavity plate, it is allowed to be fitted in the forming of female bottom fillet.
Preform selects the preformed specific steps of hydro-mechanical drawing are as follows:
1) plate to be processed is fixed between cavity plate and positioning plate；
2) blank holder moves down, until blank holder lower end surface is bonded positioning plate upper surface and compresses under pressure-pad-force effect；
3) matrix cavity is hydraulically full；
4) punch-pin downlink, by sheet metal deep drawing into matrix cavity；
5) after drawing preform, remaining liq in matrix cavity is drained；
6) matrix cavity is vacuumized；
7) punch-pin certain distance is moved up, it will be in the airtight cavity between punch-pin and drawing part by the channel in punch-pin
Air drain and lead to full liquid, guarantee that liquid did not had electrode；
8) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure act on close
On the plate in four corners of cavity plate, it is allowed to be fitted in the forming of female bottom fillet.
The specific steps of preform selection hydraulic expanding-forming are as follows:
1) plate to be processed is placed between positioning plate and cavity plate；
2) positioning plate and plate are compressed with blank holder；
3) matrix cavity is vacuumized；
4) it is passed through highly pressurised liquid into hydraulic pressure chamber, bulging is carried out to plate；
5) after hydraulic expanding-forming, release is carried out to highly pressurised liquid；
6) punch-pin downlink allows the igniter wire of connection discharge electrode pair at unshaped fillet；
7) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure act on close
On the plate in four corners of cavity plate, it is allowed to be fitted in the forming of female bottom fillet.
The beneficial effects of the invention are that:
1. core is to utilize electricity the present invention provides a kind of small round corner box part accurate forming method and its forming device
Liquid manufacturing process accomplishes small round corner Accurate Shaping.Electro-hydraulic forming has that principle is simple, energization medium is easily obtained, forming effect is good
The advantages that, moreover, the forming of the fillet at labyrinth may be implemented in the use of discharge electrode cooperation igniter wire.
2. the present invention provides three kinds of preliminary shaping methods, including rigid drawing, hydro-mechanical drawing and hydraulic expanding-forming, it is applicable in respectively
In the not high occasion of processing request, the larger occasion of drawing depth and the high occasion of surface quality requirements.It is selected according to actual requirement different
Manufacturing process, it is applied widely.
3. small round corner box part accurate forming method provided by the invention and its forming device, convex by the way that electrode is mounted on
The combined shaping that preform and electro-hydraulic forming are realized on mould, only needs clamped one time that part forming can be realized, and reduces clamping
Several and operating procedure, improves the machining accuracy of part.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described.
Fig. 1 is small round corner box part Accurate Shaping schematic device of the invention.
Fig. 2 is the punch structure schematic diagram in small round corner box part Accurate Shaping device of the invention.
Fig. 3 is the directly preformed small round corner box part Accurate Shaping schematic device of rigid drawing of the embodiment of the present invention one
And forming process.
Fig. 4 is that the embodiment of the present invention two uses the preformed small round corner box part Accurate Shaping schematic device of hydro-mechanical drawing
And forming process.
Fig. 5 is that the embodiment of the present invention three uses the preformed small round corner box part Accurate Shaping schematic device of hydraulic expanding-forming
And its forming process.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
The device that embodiment one provides includes punch-pin (1), and punch-pin (1) lower end each angle in four angles is equipped with a pair of of electric discharge electricity
Pole, the polar curve of electrode is in 90 ° of arrangements, and each electrode outside is insulating sleeve (5), and insulating sleeve (5) is placed in electrode fastener (4)
It is interior, it is fixed in through-hole (3) by electrode fastener (4), the conducting wire of electrode is connected by the blind hole (2) being connected to through-hole (3)
Into external high pressure impulse circuit；Punch-pin (1) is equipped with centre bore (17), in punch-pin (1) side-wall hole (18) and hole (17) phase
It is logical, it is used as flow channel for liquids；Punch-pin (1) outer wall installs blank holder (7), is protected between blank holder (7) and punch-pin (1) with sealing ring (16)
Demonstrate,prove leakproofness；The lower end surface of blank holder (7) is bonded with positioning plate (8) upper surface, compresses positioning plate (8) under the action of pressure-pad-force
With plate (9), it is sealed between blank holder (7) and positioning plate (8) by sealing ring (15)；Between positioning plate (8) and plate (9)
Guarantee leakproofness by sealing ring (14)；There are sealing ring (13) between plate (9) and cavity plate (10)；There is matrix cavity among cavity plate (10)
(11), aperture (12) are arranged at bottom.
The working method of the device are as follows:
1) plate to be processed is fixed between cavity plate and positioning plate；
2) blank holder moves down, until blank holder lower end surface is bonded positioning plate upper surface and compresses under pressure-pad-force effect；
3) matrix cavity is vacuumized；
4) punch-pin downlink, by sheet metal deep drawing into matrix cavity；
5) after drawing preform, move up punch-pin certain distance, by the channel in punch-pin by punch-pin and drawing part it
Between the intracorporal air of closed chamber drain and lead to full liquid, guarantee that liquid did not had electrode；
6) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure act on close
On the plate in four corners of cavity plate, it is allowed to be fitted in the forming of female bottom fillet.
Embodiment two
As shown in figure 4, the device of embodiment two is the same as example 1, which is not described herein again.
The working method of the device are as follows:
1) plate to be processed is fixed between cavity plate and positioning plate；
2) blank holder moves down, until blank holder lower end surface is bonded positioning plate upper surface and compresses under pressure-pad-force effect；
3) matrix cavity is hydraulically full；
4) punch-pin downlink, by sheet metal deep drawing into matrix cavity；
5) after drawing preform, remaining liq in matrix cavity is drained；
6) matrix cavity is vacuumized；
7) punch-pin certain distance is moved up, it will be in the airtight cavity between punch-pin and drawing part by the channel in punch-pin
Air drain and lead to full liquid, guarantee that liquid did not had electrode；
8) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure act on close
On the plate in four corners of cavity plate, it is allowed to be fitted in the forming of female bottom fillet；
Embodiment three
As shown in figure 5, the device of embodiment three is the same as example 1, which is not described herein again.
The working method of the device are as follows:
1) plate to be processed is placed between positioning plate and cavity plate；
2) positioning plate and plate are compressed with blank holder；
3) matrix cavity is vacuumized；
4) it is passed through highly pressurised liquid into hydraulic pressure chamber, bulging is carried out to plate；
5) after hydraulic expanding-forming, release is carried out to highly pressurised liquid；
6) punch-pin downlink allows the igniter wire of connection discharge electrode pair at unshaped fillet；
7) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure act on close
On the plate in four corners of cavity plate, it is allowed to be fitted in the forming of female bottom fillet.
There are many concrete application approach of the present invention, the above is only a preferred embodiment of the present invention, it is noted that for
For those skilled in the art, without departing from the principle of the present invention, it can also make several improvements, this
A little improve also should be regarded as protection scope of the present invention.
Claims (13)
1. a kind of small round corner box part accurate forming method and its forming device, it is characterised in that: as shown in Figure 1, mainly including
Punch-pin (1), blank holder (7), positioning plate (8), cavity plate (10)；The punch-pin (1) is box-shaped, and the angle of bottom four is equipped with electric discharge electricity
Extremely right, electrode fastener (4) is fixed with insulating sleeve (5), the insulation in the electrode fastener (4) in through-hole (3)
It is inserted with discharge electrode (6) in sleeve (5), discharge electrode (6) both ends through hole (3) and hole (2) are connected into external high pressure impulse circuit；
Punch-pin (1) outer wall is furnished with blank holder (7)；Plate (9) is placed between positioning plate (8) and cavity plate (10)；Cavity plate (10) be machined with
The completely the same matrix cavity of formation of parts shape (11), cavity plate (10) bottom are equipped with aperture (12).
2. a kind of small round corner box part accurate forming method according to claim 1 and its forming device, it is characterised in that:
Punch-pin (1) bottom each angle in four angles is equipped with a pair of discharge electrodes pair, totally eight electrodes, is cased with outside each electrode absolutely
Edge sleeve (5), then be mounted in corresponding hole by electrode fastener (4)；The arrangement all in 90 ° of the polar curve of each pair of discharge electrode,
It is connected between electrode with igniter wire.
3. a kind of small round corner box part accurate forming method according to claim 1 and its forming device, it is characterised in that:
It is machined with hole (17) and hole (18) inside the punch-pin (1), for being passed through liquid between punch-pin and drawing part.
4. a kind of small round corner box part accurate forming method according to claim 1 and its forming device, it is characterised in that:
Cavity plate (10) bottom is equipped with aperture (12), and aperture (12) is used to vacuumize matrix cavity (11).
5. a kind of small round corner box part accurate forming method according to claim 1 and its forming device, it is characterised in that:
Have between blank holder (7) and punch-pin (1) sealing ring (16), have between blank holder (7) and positioning plate (8) sealing ring (15), positions
Have between plate (8) and plate (9) sealing ring (14), is equipped with sealing ring (13) between plate (9) and cavity plate (10).
6. a kind of small round corner box part accurate forming method and its forming device, it is characterised in that the following steps are included:
1) plate to be processed is fixed between cavity plate and positioning plate；
2) blank holder moves down, until blank holder lower end surface is bonded positioning plate upper surface and compresses under pressure-pad-force effect；
3) matrix cavity is vacuumized；
4) punch-pin downlink, by sheet metal deep drawing into matrix cavity；
5) after drawing preform, punch-pin certain distance is moved up, it will be between punch-pin and drawing part by the channel in punch-pin
The intracorporal air of closed chamber drains and leads to full liquid, guarantees that liquid did not had electrode；
6) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure are acted on close to cavity plate
On the plate in four corners, it is allowed to be fitted in the forming of female bottom fillet.
7. a kind of small round corner box part accurate forming method according to claim 1 and its forming device, it is characterised in that:
As shown in figure 4, the preform stage uses liquid filling deep-drawing forming for the part for requiring drawing depth big.
8. a kind of small round corner box part accurate forming method according to claim 7 and its forming device, it is characterised in that:
As shown in figure 4, no change has taken place for remaining structure other than the depth increase of matrix cavity (11).
9. a kind of small round corner box part accurate forming method according to claim 7 and its forming device, it is characterised in that:
Cavity plate (10) small hole at bottom part (12) not only vacuumizes matrix cavity (11), also interior to matrix cavity (11) to be filled with and be discharged liquid.
10. a kind of small round corner box part accurate forming method according to claim 7 and its forming device, it is characterised in that
The following steps are included:
1) plate to be processed is fixed between cavity plate and positioning plate；
2) blank holder moves down, until blank holder lower end surface is bonded positioning plate upper surface and compresses under pressure-pad-force effect；
3) matrix cavity is hydraulically full；
4) punch-pin downlink, by sheet metal deep drawing into matrix cavity；
5) after drawing preform, remaining liq in matrix cavity is drained；
6) matrix cavity is vacuumized；
7) punch-pin certain distance is moved up, by the channel in punch-pin by the intracorporal sky of closed chamber between punch-pin and drawing part
Gas drains and leads to full liquid, guarantees that liquid did not had electrode；
8) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure are acted on close to cavity plate
On the plate in four corners, it is allowed to be fitted in the forming of female bottom fillet.
11. a kind of small round corner box part accurate forming method according to claim 1 and its forming device, feature exist
In: as shown in figure 5, preliminary shaping method is also an option that hydraulic expanding-forming, it is ensured that formation of parts bulging is uniform, surface smoothness
Height, forming quality are good.
12. a kind of small round corner box part accurate forming method according to claim 11 and its forming device, feature exist
In: the hydraulic pressure chamber of sealing is constituted by sealing ring between punch-pin, blank holder, positioning plate and plate, by punch-pin upper runner to liquid
It is passed through highly pressurised liquid in pressure chamber, bulging is carried out to plate.
13. a kind of small round corner box part accurate forming method according to claim 11 and its forming device, feature exist
In the following steps are included:
1) plate to be processed is placed between positioning plate and cavity plate；
2) positioning plate and plate are compressed with blank holder；
3) matrix cavity is vacuumized；
4) it is passed through highly pressurised liquid into hydraulic pressure chamber, bulging is carried out to plate；
5) after hydraulic expanding-forming, release is carried out to highly pressurised liquid；
6) punch-pin downlink allows the igniter wire of connection discharge electrode pair at unshaped fillet；
7) closure switch power on, and electrode discharges, and the shock wave of generation and high-velocity flow dynamic pressure are acted on close to cavity plate
On the plate in four corners, it is allowed to be fitted in the forming of female bottom fillet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811362931.0A CN110000283A (en) | 2018-11-09 | 2018-11-09 | A kind of small round corner box part accurate forming method and its forming device |
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|---|---|---|---|
| CN201811362931.0A CN110000283A (en) | 2018-11-09 | 2018-11-09 | A kind of small round corner box part accurate forming method and its forming device |
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Cited By (3)
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| CN112275888A (en) * | 2020-09-07 | 2021-01-29 | 华中科技大学 | Electromagnetic electro-hydraulic composite forming method and device |
| CN112658095A (en) * | 2020-12-29 | 2021-04-16 | 周富强 | Water tank liquid filling type forming device |
| EP4108429A4 (en) * | 2020-10-28 | 2024-02-28 | LG Energy Solution, Ltd. | Battery case molding apparatus using shock wave, and battery case molding method using same |
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| CN112275888A (en) * | 2020-09-07 | 2021-01-29 | 华中科技大学 | Electromagnetic electro-hydraulic composite forming method and device |
| EP4108429A4 (en) * | 2020-10-28 | 2024-02-28 | LG Energy Solution, Ltd. | Battery case molding apparatus using shock wave, and battery case molding method using same |
| CN112658095A (en) * | 2020-12-29 | 2021-04-16 | 周富强 | Water tank liquid filling type forming device |
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