CN110000269A - A kind of tubing local feature electro-hydraulic forming device and its manufacturing process - Google Patents
A kind of tubing local feature electro-hydraulic forming device and its manufacturing process Download PDFInfo
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- CN110000269A CN110000269A CN201910422321.3A CN201910422321A CN110000269A CN 110000269 A CN110000269 A CN 110000269A CN 201910422321 A CN201910422321 A CN 201910422321A CN 110000269 A CN110000269 A CN 110000269A
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- petal
- cover plate
- pipe
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- hydraulic forming
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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
- B21D26/02—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
- B21D26/06—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 by shock waves
- B21D26/12—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 by shock waves initiated by spark discharge
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
The present invention discloses a kind of tubing local feature electro-hydraulic forming device, including left petal, right petal, anode, cathode, wire and pulse high current discharge equipment, pipe to be formed is placed in the inner cavity of left petal, right petal forms the type chamber for fixing pipe with left petal phase secure fit, and upper cover plate and lower cover plate are installed in the top and bottom end of type chamber respectively；Insulated enclosure seat is threadedly coupled with anode and is fixedly connected on upper cover plate by fastening bolt, cathode is fixedly connected on lower cover plate, the anode intracavitary positioned at type is connected with the end of cathode by wire, and the outer end of anode and cathode is connected with pulse high current discharge equipment；And liquid medium is injected in pipe.Electro-hydraulic forming device of the invention and its manufacturing process shape tubing local feature using electro-hydraulic forming method, wear the waveform of the method control shock wave of silk using coaxial electrode and pressure is distributed, be allowed to be conducive to job requirement.
Description
Technical field
The present invention relates to metal tube Plastic Forming manufacturing technology field, more particularly to a kind of tubing local feature it is electro-hydraulic at
Shape dress is set and its manufacturing process.
Background technique
The elements such as bellows, screwed pipe, the sleeve of tubing part minutiae, be widely used in instrument, aerospace,
The industry departments such as electric power, metallurgy, petrochemical industry, atomic energy, locomotive are usually used in compensating original part, flexible connecting member and heat exchange element.
Current main manufacturing process has: hydraulic expanding-forming, mechanical bulging, rubber bulging, rolling formation etc..From the point of view of comparison, hydraulic expanding-forming
Thinned speed be greater than Plastic Forming speed, pressure control it is improper it is easy rupture, be easily broken at local feature in use,
Mould volume is big simultaneously, structure is complicated.The forming speed of mechanical bulging and rubber bulging is slow, clamping accuracy is not high.Rolling formation
Cold hardening layer can be formed in pipe surface, will cause biggish residual stress, the mechanical damage of pipe surface is serious, and local feature is whole
Reducing thickness is uneven.Part is caused to be difficult to reach forming requirements, production efficiency is low, high rejection rate, at high cost, labor intensity of workers
Greatly.
Summary of the invention
It is above-mentioned to solve the object of the present invention is to provide a kind of tubing local feature electro-hydraulic forming device and its manufacturing process
Problem of the existing technology shapes tubing local feature using electro-hydraulic forming method, the method for wearing silk using coaxial electrode
The waveform and pressure for controlling shock wave are distributed, and are allowed to be conducive to job requirement.
To achieve the above object, the present invention provides following schemes: the present invention provide a kind of tubing local feature it is electro-hydraulic at
Shape dress is set, including left petal, right petal, anode, cathode, wire and pulse high current discharge equipment,
Pipe to be formed is placed in the inner cavity of the left petal, the right petal and the left petal phase secure fit shape
At the type chamber for fixing pipe, upper cover plate and lower cover plate, and the pipe chamber are installed in the top and bottom end of the type chamber respectively
Inside it is injected with liquid medium；
Insulated enclosure seat is threadedly coupled with the anode and is fixedly connected on the upper cover plate by fastening bolt, described
Cathode is fixedly connected on the lower cover plate, and the end positioned at the intracavitary anode of the type and cathode passes through the wire
It is connected, the outer end of the anode and cathode is connected with the pulse high current discharge equipment.
Preferably, corresponding position is welded with hoop clip in the left petal and right petal, by pin by corresponding institute
Hoop clip is stated to be locked to fasten left and right petal；Gas vent is offered in the left petal and right petal.
Preferably, it is according to the position to be processed and length of pipe come really that the cathode, which puts in the intracavitary length of the type,
It is fixed.
Preferably, open up fluted on the upper cover plate and lower cover plate, the both ends of the left petal and right petal are located at
In groove.
Preferably, special-shaped seal ring is provided in the groove on the lower cover plate.
Preferably, the outer sheath for the upper cover plate being located on the anode is equipped with load metal block.
Preferably, the pulse high current discharge equipment includes the charge circuit and discharge loop of interval conducting, described to fill
Power supply in electrical circuit is used to charge to capacitor group with charge switch, when discharge switch is closed in the discharge circuit,
The capacitor group is through the coil discharge.
It is electro-hydraulic applied to above-mentioned tubing local feature the present invention also provides a kind of tubing local feature electro-hydraulic forming method
Forming device, comprising the following steps:
According to the Working position and length of pipe to be formed, the length of type chamber should be put in by calculating cathode, by cathode according to
The length of calculating screws in lower cover plate；
Pipe to be formed is fitted into the petal of left and right, positioned with pin and fastens hoop clip；
Wire is closely wound in the circumferential groove of the negative end in type chamber；After reserving required wire length,
The slip-knot of set strand is beaten in wire the other end；
The assembly of petal, pipe to be processed is landed in the groove of lower cover plate, adjustment position make pipe to be processed with
Sealing ring cooperation is close；
The quantitative liquid medium of the intracavitary injection of pipe, fastens upper cover plate；
Anode is protruded into that type is intracavitary to catch on reserved set by the length that positive insulation sleeve is reserved according to required wire length
Insulated enclosure seat and load metal block are finally screwed in positive designated position blending bolt and fixed by strand slip-knot；
Press applies coupling mechanism force to upper and lower cover plates, guarantees intracavitary be absolutely sealed；
Positive and negative lead wires are accessed into pulse high current discharge equipment, implement electro-hydraulic forming process；
Press coupling mechanism force is laid down after completion of processing, and upper cover plate and anode are removed；Mould intracavity liquid is poured out；Separation left and right
Petal takes out forming pipe fitting.
The present invention achieves following technical effect compared with the existing technology:
Tubing local feature electro-hydraulic forming device of the invention and its manufacturing process can solve tubing part minutiae
Shape the figuration manufactures problems such as difficulty is big, tool structure is complicated, processing cost is high.Tooling is than traditional required for electro-hydraulic forming
Punching block forming is simple, Flexible fixture is high, and without the friction of punch-pin and piece surface, forming accuracy is high, and surface quality of workpieces can be with
It is guaranteed.Meanwhile electrode is axially distributed using bipolar system in this method, discharge process is stable, it is easily controllable put electric arc channel and
Energy releasing position, can solve that the quick-fried electro-hydraulic forming electrode of ipsilateral electrode wires is irremovable, electrode spacing is uncontrollable, discharge energy
The problems such as inaccurate, the leakage loss height of control.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the overall structure diagram of tubing local feature electro-hydraulic forming device；
Fig. 2 is one mesopetalum mold cavity part " bulging " protrusion features of embodiment；
Fig. 3 is two mesopetalum mold cavity part " screw thread " protrusion features of embodiment；
Fig. 4 is three mesopetalum mold cavity part " ripple " protrusion features of embodiment；
Wherein, 1 fastening bolt；2 insulated enclosure seats；3 insulation sleeves；4 anodes；5 wires；6 petal inner cavity features are locally put
Greatly；7 liquid mediums；8 right petals；9 special-shaped seal rings；10 cathode；11 lower cover plates；12 left petals；13 hoop clips；14 gas vents；15
Pipe to be formed；16 fastening nuts；17 upper cover plates；18 load metal blocks；19 pulse high current discharge equipments；20 discharge switches；
21 charge switch；22 capacitor groups；23 charge power supplies.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
It is above-mentioned to solve the object of the present invention is to provide a kind of tubing local feature electro-hydraulic forming device and its manufacturing process
Problem of the existing technology shapes tubing local feature using electro-hydraulic forming method, the method for wearing silk using coaxial electrode
The waveform and pressure for controlling shock wave are distributed, and are allowed to be conducive to job requirement.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Please refer to Fig. 1-4, wherein Fig. 1 is the overall structure diagram of tubing local feature electro-hydraulic forming device；Fig. 2 is
One mesopetalum mold cavity part " bulging " protrusion features of embodiment；Fig. 3 is that two mesopetalum mold cavity part " screw thread " protrusion of embodiment is special
Sign；Fig. 4 is three mesopetalum mold cavity part " ripple " protrusion features of embodiment.
The invention belongs to metal tube Plastic Forming manufacturing fields, are related to the various forming tubing that difficulty is big, required precision is high
The manufacturing process of local feature.With this process unit to tubular member part bulging, it can solve certain difficult forming tubes and long and narrow
The Problems in forming of parts locally feature, forming quality is easy to control, and technology and pattern assembly is simple to operation.
The electro-hydraulic forming method of tubing local feature proposed by the present invention and a set of flexible frock based on electro-hydraulic forming.Phase
Than in other high energy rate forming methods such as electro-magnetic forming, explosive forming, electro-hydraulic forming can shape material to workpiece conductivity no requirement (NR)
Expect that range is wide, safety is easy to operate.Meanwhile compared to general tradition forming, electro-hydraulic forming can improve the forming limit of material, one
Secondary forming can reach forming accuracy；The one-side mould for only needing corresponding local feature, is not necessarily to punch-pin, simplifies mold tooling；Forming
Surface quality of workpieces is good, no marking, high yield rate, high production efficiency.
Specifically, by taking Fig. 1 as an example, illustrate the operating process of tubing of the present invention local feature electro-hydraulic forming method.
Insulated enclosure seat 2 is threadedly coupled with anode 4 in Fig. 1, and is connected on upper cover plate 17 by fastening bolt 1, cathode
10 are connected on lower cover plate 11, intracavitary positive 4 and 10 end of cathode connected by preset wire 5, pipe 15 to be formed is placed in a left side
In 12 inner cavity of petal, gas vent 14 is offered in left petal 12 and right petal 8, right petal 8 passes through pin precise positioning and a left side
Petal 12 cooperates fixed pipe, and petal inner cavity partial enlargement 6 is the shape in type chamber for the forming of tubing local feature.Left and right valve
It is mounted as a whole between upper cover plate 17 and lower cover plate 10 after mould is fixed, fastens left and right by locking the hoop clip 13 being welded in petal
Petal locks upper and lower cover plates by press machine or other devices, guarantees sealing effect, and positive and negative electrode outer end connects pulse high current
Discharge equipment 19.
Steps are as follows for technological operation:
1. the length of type chamber should be put in by calculating cathode 10 according to pipe position to be processed and length；By cathode 10 according to
The length of calculating screws in lower cover plate 11.
2. pipe 15 to be formed is fitted into the petal of left and right, with pin positioning and circumferential fastening hoop clip 13.
3. being closely wound line quick-fried silk (wire 5) in the circumferential groove of 10 end of cathode in type chamber；Needed for reserving
After line quick-fried silk length, the slip-knot of set strand is beaten in online quick-fried silk the other end.
4. the assembly of petal, pipe to be formed 15 is landed in the groove of lower cover plate 11, adjustment position makes to be formed
Pipe 15 and special-shaped seal ring 9 cooperate closely.
5. the quantitative liquid medium 7 of the intracavitary injection of pipe, fastens upper cover plate 17.
6. reserving the length of the insulation sleeve 3 of anode 4 according to required line quick-fried silk length, anode 4 is protruded into that type is intracavitary to be caught on
Reserved set strand slip-knot, and it is fixed with fastening nut 16, insulated enclosure seat 2 and load metal block 18 are finally screwed in into anode 4
Designated position is simultaneously fixed with fastening bolt 1.
7. press applies coupling mechanism force to upper and lower cover plates, guarantee intracavitary be absolutely sealed.
8. positive and negative lead wires are accessed pulse high current discharge equipment 19, electrode is made by pulse high current discharge equipment 19
It discharges, passes through high-voltage pulse high current in the electrodes.Pulse high current discharge equipment 19 includes the height for storing electric energy
Press impulse capacitor group and charge switch 21 (being in normally open).When capacitor group 22 by charge power supply 23 be charged to it is pre-
When setting voltage, charge circuit is disconnected, is closed discharge switch 20, then discharge loop is connected, and capacitor group 22 is generated through electrode discharge
Electro-hydraulic forming processing is implemented according to electromagnetic induction principle in decaying concussion pulse high current I and corresponding transient changing magnetic field
Process.
9. laying down press coupling mechanism force after completion of processing, upper cover plate 17 and anode 4 are removed；Mould intracavity liquid is poured out；Point
Forming pipe fitting is taken out from left and right petal.
Embodiment one
As shown in Fig. 2, material: a kind of GH536 alloy material tubular member, length 380mm, outer diameter 47.2mm, wall thickness
0.4mm.It is required that carrying out local bulging in the length of symmetrical middle part 60mm, knuckle R13mm, outer diameter is controlled after forming
In 48 ± 0.05mm.Tooling is complicated when being shaped with conventional methods such as hydraulic expanding-formings for the part, needs large pressing machine and filling liquid system
System, and forming dimension precision is not high, bulging transition region is easy to crack, it is difficult to meet requirement.
It is formed using bulging feature electro-hydraulic forming method in tubing part in Fig. 2.Discharge equipment voltage rating, energy point
It Wei not 18kV and 50kJ.To guarantee that the region 60mm is fully formed in the middle part of tubing, passes through diameter phi 0.6mm, length between axial bipolar electrode
The preset fine aluminium silk connection of 90mm is spent, specific discharge voltage is 10.5kV.
Forming effect shown in Fig. 2 is as follows: outer diameter 48mm-48.04mm, radius are after deformed area bulging
R13mm.The defects of forming accuracy meets requirement, and surface quality is good, non-microcracked and burr, qualification rate is high, production effect
Rate is high.
Embodiment two
As shown in figure 3, a kind of 304 stainless steel material tubular members, length 300mm, outer diameter 26.6mm, wall thickness 0.3mm.It is required that
Symmetrical two screw thread waves in 150mm length, two screw thread waves are rotated along pipe shaft in the middle part of the tubing, screw pitch 75mm, wave height
0.78mm, ripple radius R2.1mm, excessive fillet R1mm.The part be machined into, cold rolling, the conventional methods forming such as hot rolling
When tooling is complicated, forming efficiency is low, forming dimension precision is low, bulging transition region is easy to crack, it is difficult to meet requirement.
It is formed using tubing partial screw threads feature electro-hydraulic forming method in Fig. 3.Pulse high current discharge equipment is specified
Voltage, energy are respectively 18kV and 50kJ.To guarantee that the region 150mm is fully formed in the middle part of tubing, by straight between axial bipolar electrode
The preset wire connection of fine aluminium of diameter φ 0.6mm, length 200mm, specific discharge voltage is 7kV.
Forming effect shown in Fig. 3 is as follows: wave height 0.76mm-0.78mm, ripple radius R2.1mm, excessive fillet
R1mm, ripple interval error are less than 0.2mm.Meet requirement, surface quality is good, and qualification rate is high, and productivity is high, equipment money
Source occupies less, easy to operate.
Embodiment three
As shown in figure 4, material: a kind of TA1 titanium alloy material tubular member, length 400mm, outer diameter 150mm, wall thickness 0.5mm.
It is required that being uniformly distributed 4 waves in the middle part of the tubing in 150mm length, wave height 10mm, ripple radius R12, excessive fillet are shaped
R5.Part tooling when with hydraulic expanding-forming is complicated, forming accuracy is poor, and cracking is easy at trough, it is difficult to meet requirement.
It is formed using corrugation patterns electro-hydraulic forming method in tubing part shown in Fig. 4.Pulse high current discharge equipment
Voltage rating, energy are respectively 18kV and 50kJ.To guarantee that the region 150mm is fully formed in the middle part of tubing, leads between axial bipolar electrode
The preset wire connection of fine aluminium of diameter phi 0.6mm, length 200mm are crossed, specific discharge voltage is 11.5kV.
Forming effect shown in Fig. 4 is as follows: wave height 9.96mm-10.02mm, ripple radius R12mm, excessive fillet
R5mm, ripple interval error are less than 0.2mm.Meet requirement, surface quality is good, and qualification rate is high, and productivity is high, equipment money
Source occupies less, easy to operate.
Specific examples are applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Illustrate to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to
According to thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (8)
1. a kind of tubing local feature electro-hydraulic forming device, it is characterised in that: including left petal, right petal, anode, cathode, gold
Belong to silk and pulse high current discharge equipment,
Pipe to be formed is placed in the inner cavity of the left petal, and the right petal is formed with the left petal phase secure fit and used
In the type chamber of fixed pipe, upper cover plate and lower cover plate, and the intracavitary note of the pipe are installed in the top and bottom end of the type chamber respectively
Enter to have liquid medium；
Insulated enclosure seat is threadedly coupled with the anode and is fixedly connected on the upper cover plate by fastening bolt, the cathode
It is fixedly connected on the lower cover plate, the end positioned at the intracavitary anode of the type and cathode passes through the wire phase
Even, the outer end of the anode and cathode is connected with the pulse high current discharge equipment.
2. tubing local feature electro-hydraulic forming device according to claim 1, it is characterised in that: the left petal and right valve
Corresponding position is welded with hoop clip on mould, is locked the corresponding hoop clip to fasten left and right petal by pin；Institute
It states and offers gas vent in left petal and right petal.
3. tubing local feature electro-hydraulic forming device according to claim 1, it is characterised in that: the cathode puts in described
The intracavitary length of type is determined according to the position to be processed of pipe and length.
4. tubing local feature electro-hydraulic forming device according to claim 1, it is characterised in that: the upper cover plate and lower cover
Open up fluted on plate, the both ends of the left petal and right petal are in the grooves.
5. tubing local feature electro-hydraulic forming device according to claim 4, it is characterised in that: recessed on the lower cover plate
Special-shaped seal ring is provided in slot.
6. tubing local feature electro-hydraulic forming device according to claim 1, it is characterised in that: be located at institute on the anode
The outer sheath for stating upper cover plate is equipped with load metal block.
7. tubing local feature electro-hydraulic forming device according to claim 1, it is characterised in that: the pulse high current is put
Electric equipment includes the charge circuit and discharge loop of interval conducting, and the power supply and charge switch in the charge circuit are used for electricity
Container group charges, and when discharge switch is closed in the discharge circuit, the capacitor group is through the coil discharge.
8. it is special to be applied to tubing part of any of claims 1-7 for a kind of tubing local feature electro-hydraulic forming method
Levy electro-hydraulic forming device, which comprises the following steps:
According to the Working position and length of pipe to be formed, the length of type chamber should be put in by calculating cathode, by cathode according to calculating
Length screw in lower cover plate in；
Pipe to be formed is fitted into the petal of left and right, positioned with pin and fastens hoop clip；
Wire is closely wound in the circumferential groove of the negative end in type chamber；After reserving required wire length, in gold
Belong to the slip-knot that set strand is beaten in silk the other end；
The assembly of petal, pipe to be processed is landed in the groove of lower cover plate, adjustment position makes pipe to be processed and sealing
Circle cooperation is close；
The quantitative liquid medium of the intracavitary injection of pipe, fastens upper cover plate；
Anode is protruded into that type is intracavitary to catch on reserved set strand by the length that positive insulation sleeve is reserved according to required wire length
Insulated enclosure seat and load metal block are finally screwed in positive designated position blending bolt and fixed by slip-knot；
Press applies coupling mechanism force to upper and lower cover plates, guarantees intracavitary be absolutely sealed；
Positive and negative lead wires are accessed into pulse high current discharge equipment, implement electro-hydraulic forming process；
Press coupling mechanism force is laid down after completion of processing, and upper cover plate and anode are removed；Pipe intracavity liquid is poured out；Separate left and right valve
Mould takes out forming pipe fitting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910422321.3A CN110000269A (en) | 2019-05-21 | 2019-05-21 | A kind of tubing local feature electro-hydraulic forming device and its manufacturing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910422321.3A CN110000269A (en) | 2019-05-21 | 2019-05-21 | A kind of tubing local feature electro-hydraulic forming device and its manufacturing process |
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| Publication Number | Publication Date |
|---|---|
| CN110000269A true CN110000269A (en) | 2019-07-12 |
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ID=67177584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910422321.3A Pending CN110000269A (en) | 2019-05-21 | 2019-05-21 | A kind of tubing local feature electro-hydraulic forming device and its manufacturing process |
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| CN (1) | CN110000269A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111069395A (en) * | 2019-12-18 | 2020-04-28 | 哈尔滨工业大学 | Metal pipe fitting precision forming device and forming method for electric pulse triggering energetic material |
| CN111842610A (en) * | 2020-06-12 | 2020-10-30 | 华中科技大学 | Electromagnetic drive-electrohydraulic pipe fitting forming device and method |
| CN114178388A (en) * | 2021-10-20 | 2022-03-15 | 哈尔滨工业大学（威海） | Low-temperature electro-hydraulic forming device and method for metal tubular part with local characteristics |
| CN114324741A (en) * | 2020-09-30 | 2022-04-12 | 宝山钢铁股份有限公司 | Roller punching forming rib groove characteristic forming limit evaluation die and evaluation method |
| CN114589242A (en) * | 2022-03-03 | 2022-06-07 | 华中科技大学 | Electro-hydraulic local orthopedic device and method for metal workpiece |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111069395A (en) * | 2019-12-18 | 2020-04-28 | 哈尔滨工业大学 | Metal pipe fitting precision forming device and forming method for electric pulse triggering energetic material |
| CN111842610A (en) * | 2020-06-12 | 2020-10-30 | 华中科技大学 | Electromagnetic drive-electrohydraulic pipe fitting forming device and method |
| CN111842610B (en) * | 2020-06-12 | 2021-08-20 | 华中科技大学 | Electromagnetic drive-electrohydraulic pipe fitting forming device and method |
| CN114324741A (en) * | 2020-09-30 | 2022-04-12 | 宝山钢铁股份有限公司 | Roller punching forming rib groove characteristic forming limit evaluation die and evaluation method |
| CN114324741B (en) * | 2020-09-30 | 2024-02-13 | 宝山钢铁股份有限公司 | Evaluation die and evaluation method for characteristic forming limit of roll-punched forming rib groove |
| CN114178388A (en) * | 2021-10-20 | 2022-03-15 | 哈尔滨工业大学（威海） | Low-temperature electro-hydraulic forming device and method for metal tubular part with local characteristics |
| CN114589242A (en) * | 2022-03-03 | 2022-06-07 | 华中科技大学 | Electro-hydraulic local orthopedic device and method for metal workpiece |
| CN114589242B (en) * | 2022-03-03 | 2022-11-22 | 华中科技大学 | Electro-hydraulic local shape righting device and method for metal workpiece |
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Application publication date: 20190712 |
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