CN109807222A - A kind of micro- blanking apparatus of electromagnetism and method - Google Patents
A kind of micro- blanking apparatus of electromagnetism and method Download PDFInfo
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- CN109807222A CN109807222A CN201910247945.6A CN201910247945A CN109807222A CN 109807222 A CN109807222 A CN 109807222A CN 201910247945 A CN201910247945 A CN 201910247945A CN 109807222 A CN109807222 A CN 109807222A
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Abstract
The present invention provides a kind of micro- blanking apparatus of electromagnetism and method, is related to machine-building and Plastic Microforming Technology field.The micro- blanking apparatus of the electromagnetism includes coil, driving plate, formed punch, cavity plate, die block, pressure plate and oriented module；Designed using band formed punch, improve in traditional single cavity plate electromagnetic cutting technique because characteristic size it is small caused by forming capacity deficiency and the bad problem of forming effect.The present invention is high speed blanking technology, compared with other micro- punching process, has many advantages, such as that forming accuracy is high, residual stress is low and is easy to implement automation；Electro Magnetic Forming technology is applied in micro- punching process of multiple material by the present invention, including the material that electric conductivity is poor.
Description
Technical field
The present invention relates to machine-building and Plastic Microforming Technology field, more particularly to a kind of micro- blanking apparatus of electromagnetism and
Method.
Background technique
Porous plate part has non-in various oil spouts (vapour) mouth, microelectronic integrated circuit, aerospace electron, lead frame etc.
It is often widely applied, and very high to dimension precision requirement.However the device of existing alloy sheets electromagnetism piercing and flanging, it is only suitable
For high conductivity plate and macropore, when plate poorly conductive or aperture are less than 1mm, ask there are forming capacity is insufficient
Topic.
Summary of the invention
The object of the present invention is to provide a kind of micro- blanking apparatus of electromagnetism and method, solves plate poorly conductive or aperture is small
When forming capacity deficiency problem.
To achieve the above object, the present invention provides following schemes:
A kind of micro- blanking apparatus of electromagnetism, including pedestal, coil, driving plate, formed punch, cavity plate, die block, pressure plate and
Oriented module；
The coil is connect with the whorl of base；
The driving plate is located above the coil；
The formed punch is fixed in the driving plate, and the cavity plate is directed toward in the punching direction of the formed punch；
The lower surface of the die block has the groove being recessed upwards, and the cavity plate is fixed in the groove；
The lower surface of the cavity plate has the cavity plate groove being recessed upwards, the size of the formed punch and the cavity plate groove
Recess size matches；
Plate to be formed is placed between the formed punch and the cavity plate；
The pressure plate is located at the lower section of the die block, and Chong Die with the female mold part；
The pressure plate is for pressing up the plate in the cavity plate；
One end of the oriented module is slidably connected with the driving plate, the other end and the fixed company of the die block
It connects；
The oriented module is for being oriented to the vertical motion of the driving plate.
Optionally, further includes: power-supply system；The power-supply system is electrically connected with the coil；The power-supply system is used for
For the coil power supply.
Optionally, further includes: buffer module；The buffer module is for buffering the upward impact force of the driving plate；
The buffer module includes: limit plate, buffer medium and pillar；
One end of the pillar is bolted with the die block, the upper surface of the other end and the limit plate
It is bolted；
The lower surface bonds of the buffer medium and the limit plate；
The limit plate is for preventing the formed punch from colliding the die block；
The buffer medium is hit for preventing the driving plate and the limit plate from hardness occurs.
Optionally, further includes: pressure-pad-force adjustment module；
The pressure-pad-force adjustment module includes: screw rod, compression spring and adjusting nut；
Pressure-pad-force adjustment hole is equipped on the pressure plate and the die block；The screw rod passes through institute from bottom to up
It states pressure-pad-force adjustment hole and sequentially passes through the pressure plate and the die block, and hold the pressure plate；
The pressure spring set is pierced by the part of the die block in the screw rod；
The adjusting nut is placed on the compression spring, and is connect with the screw flight；
The pressure-pad-force adjustment module is for adjusting the pressure-pad-force that the pressure plate presses the plate.
Optionally, the oriented module includes: guide sleeve and guide post；
The driving plate is equipped with dowel hole, and the guide sleeve is placed in the dowel hole, and Nian Jie with the dowel hole；
One end of the guide post and the guide sleeve, which roll, to be connected, and the other end is connect by bolt with the die block.
Optionally, the driving plate is one layer or one layer or more structure, and at least one layer of is high conductivity material.
Optionally, at least one layer of the driving plate is copper or aluminium or copper alloy or aluminium alloy.
Optionally, the plate is sheet metal, with a thickness of 0.05~1mm.
A kind of micro- blanking method of electromagnetism, applied to the above-mentioned micro- blanking apparatus of electromagnetism；
The micro- blanking method of electromagnetism includes:
Obtain punching parameter；
Plate to be formed is placed between pressure plate and cavity plate；
It adjusts pressure-pad-force adjustment module and compresses the plate to be formed；
It is powered to coil, starts to be punched；
After punching, the plate that the pressure-pad-force adjustment module takes out forming is adjusted.
The specific embodiment provided according to the present invention, the invention discloses following technical effects:
The present invention uses band formed punch to design, and improves in traditional single cavity plate electromagnetic cutting technique due to characteristic size is small
Caused forming capacity deficiency and the bad problem of forming effect；Compared with traditional electromagnetism microsecond delay technique, driving of the invention
Plate is halted by hitting elastic fluid, will not be deformed because of impact, reusable；The present invention is pressurizeed using bolt
Power spring structure carry out flanging, with traditional electromagnetism microsecond delay technique only carry out flanging with bolt compared with, can more accurately control
Pressure-pad-force.The present invention is high speed blanking technology simultaneously, compared with other micro- punching process, has forming accuracy height, residual stress
It is low and the advantages that be easy to implement automation；Electro Magnetic Forming technology is applied in micro- punching process of multiple material by the present invention, packet
Include the poor material of electric conductivity.
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 any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structure chart of the micro- blanking apparatus of electromagnetism provided by the embodiment of the present invention 1；
Fig. 2 is the structure chart of the micro- blanking apparatus driving plate of electromagnetism provided by the embodiment of the present invention 1；
Fig. 3 is the sectional view of the micro- blanking apparatus circular ring shape buffer module of electromagnetism provided by the embodiment of the present invention 1；
Fig. 4 is the top view of the micro- blanking apparatus circular ring shape buffer module of electromagnetism provided by the embodiment of the present invention 1；
Fig. 5 is the flow chart of the micro- blanking method of electromagnetism provided by the embodiment of the present invention 2.
Wherein, 1, pedestal；2, form-wound coil；3, driving plate；4, buffer module；5, pressure plate；6, die block；7, it rushes
Head fixed plate, 8, formed punch；9, cavity plate；10, pressure-pad-force adjustment module；11, plate；12, oriented module；13, power-supply system；21,
Copper plate layer；22,45# steel plate layer；31, cushion rubber layer；32, steel plate；41, elastic buffer medium；42, limit plate；43, it props up
Column；101, screw rod；102, compression spring；103, adjusting nut；121, guide post；122, guide sleeve is driven；123, binder guide sleeve.
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.
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.
Embodiment 1
Fig. 1 is the structure chart of the micro- blanking apparatus of electromagnetism provided by the embodiment of the present invention 1.Referring to Fig. 1, a kind of micro- punching of electromagnetism
Cut out device, including pedestal 1, coil, driving plate 3, formed punch 8, cavity plate 9, die block 6, pressure plate 5 and oriented module 12.
Coil is threadedly coupled with pedestal 1.Coil uses formed coil 2.
Driving plate 3 is located above coil, and in the non-punching time, driving plate 3 is pressed on coil with self gravity.Driving plate 3
For one layer or one layer or more structure, and at least one layer of is high conductivity material.At least one layer of driving plate 3 is copper or aluminium or copper
Alloy or aluminium alloy.
Driving plate 3 can be the driving plate 3 of double-layer structure, and Fig. 2 is the micro- punching dress of electromagnetism provided by the embodiment of the present invention 1
Set the structure chart of driving plate 3.Referring to fig. 2, the double-layer structure of driving plate 3 includes high conductivity copper plate layer 21 and material is 45#
Steel plate layer 22.Copper plate layer 21 and 45# steel plate layer 22 is bolted, and bolt uses countersunk head screw.Copper plate layer 21 and line
Circle contact, high conductivity material red copper can reduce resistance, increase the eddy current induced in driving plate 3, to increase electricity
Magnetic force.45# steel plate layer 22 is contacted with buffer module 4, and 45# steel plate layer 22 is the intensity in order to increase driving plate 3, avoids driving plate
3 deform when hitting with buffer module 4, and increase the contact strength with guide sleeve 112, avoid driving plate 3 and guide sleeve 112
Contact zone deform and influence to be oriented to.
Formed punch 8 is fixed in driving plate 3, and cavity plate 9 is directed toward in the punching direction of formed punch 8.It is preferred that formed punch 8 passes through punch fixing plate
7 are fixed in driving plate 3, and punch fixing plate 7 is fixed in driving plate 3 by positioning pin, and punch fixing plate 7 is used for formed punch 8
It is fixed and positions.
The lower surface of die block 6 has the groove being recessed upwards, and cavity plate 9 is fixed in groove.
The lower surface of cavity plate 9 has 9 groove of cavity plate being recessed upwards, the size of formed punch 8 and the recess size of 9 groove of cavity plate
Match, the gap between formed punch 8 and cavity plate 9 is blade clearance.
Plate 11 to be formed is placed between formed punch 8 and cavity plate 9.Plate 11 is sheet metal, and thickness h is 0.05~1mm,
The material selection titanium alloy or magnesium alloy of plate 11.
Pressure plate 5 is located at the lower section of die block 6, and partly overlaps with cavity plate 9.
Pressure plate 5 is for pressing up plate 11 in cavity plate 9.
One end of oriented module 12 is slidably connected with driving plate 3, and the other end is fixedly connected with die block 6.
Oriented module 12 is for being oriented to the vertical motion of driving plate 3.Oriented module 12 include: driving guide sleeve 122,
Binder guide sleeve 123 and guide post 121.
Driving plate 3 be equipped with driving dowel hole, driving guide sleeve 122 be placed in driving dowel hole in, and with driving dowel hole
Bonding or interference fit connection.
One end of guide post 121 and driving guide sleeve 122 are rolled and are connected, and the other end is connect by bolt with die block 6.
Pressure plate 5 is equipped with binder dowel hole, and binder guide sleeve 123 is placed in binder dowel hole, and with binder dowel hole
Bonding or interference fit connection, pressure plate 5 are slidably connected by binder guide sleeve 123 with guide post 121.
The micro- blanking apparatus of electromagnetism further include: power-supply system 13.Power-supply system 13 is electrically connected with coil；Power-supply system 13 is used for
For coil power supply.
Power-supply system 13 includes: high pressure adjustable DC power supply, energy-storage capacitor and switch.High pressure adjustable DC power supply is used for
It charging to energy-storage capacitor, high pressure adjustable DC power source internal has transformation system, and it is identical as general transformer principle, pass through adjusting
The coil turn in circuit is accessed, output voltage is adjusted.The both ends of energy-storage capacitor are connect by switch with the both ends of coil, are passed through
The on-off of switch control electric current.After power-supply system 13 is to coil discharge, induction generates vortex in driving plate 3, thus by coil
Electromagnetic force, drive formed punch 8 to plate 11 move, to plate 11 carry out Blanking Shaping processing.
The micro- blanking apparatus of electromagnetism further include: buffer module 4.The impact force upward for buffered-display driver plate 3 of buffer module 4.
The shape of buffer module 4 can be designed according to the shape of driving plate 3, obtain the maximum cushioning area with driving plate 3, specifically
Round, rectangular or other irregular shapes can be used.Buffer module 4 includes: limit plate 42, buffer medium and pillar 43.
One end of pillar 43 is bolted with die block 6, and the upper surface of the other end and limit plate 42 passes through spiral shell
It tethers and connects.Pillar 43 passes through pressure plate 5, but is not in contact with pressure plate 5.
The lower surface bonds of buffer medium and limit plate 42.Buffer medium is elastic buffer medium 41, elastic buffer medium
41 can use rubber or other elastic materials.
Limit plate 42 also protects formed punch 8 not occur with other structures for preventing formed punch 8 from colliding die block 6
It hits.
Buffer medium for preventing driving plate 3 and limit plate 42 from occurring, hit or hard contact impacts by hardness.
The present embodiment 1 provides a kind of specific embodiment of buffer module 4, and Fig. 3 is electricity provided by the embodiment of the present invention 1
The sectional view of the micro- blanking apparatus circular ring shape buffer module 4 of magnetic；Fig. 4 is the micro- blanking apparatus of electromagnetism provided by the embodiment of the present invention 1
The top view of circular ring shape buffer module 4.Referring to Fig. 3 and Fig. 4, the shape of buffer module 4 is circular ring shape, and buffer medium is slow for rubber
Layer 31 is rushed, limit plate 42 is steel plate 32, and formed punch 8 moves forward and backward in the circular hole among buffer module 4.When 13 pairs of power-supply system at
After shape coil discharge, induction generates vortex in driving plate 3, and driving plate 3 drives formed punch 8 to travel forward under the action of electromagnetic force,
And Blanking Shaping is carried out to plate 11, after Blanking Shaping, driving plate 3 hits the stopping of cushion rubber layer 31 and travels forward.
Guide post 121 also extends through buffer module 4, but is not in contact with buffer module 4.
The micro- blanking apparatus of electromagnetism further include: pressure-pad-force adjustment module 10.Pressure-pad-force adjustment module 10 includes: screw rod 101, pressure
Power spring 102 and adjusting nut 103.
Pressure-pad-force adjustment hole is equipped on pressure plate 5 and die block 6；Screw rod 101 passes through pressure-pad-force tune from bottom to up
Knothole sequentially passes through pressure plate 5 and die block 6, and holds pressure plate 5, and the head of specific screw rod 101 holds pressure plate
5, screw rod 101 selects long bolt.
102 sets of the compression spring parts for being pierced by die block 6 in screw rod 101.
Adjusting nut 103 matches with screw rod 101, and adjusting nut 103 is placed on compression spring 102, and with screw rod 101
It is threadedly coupled.Adjusting nut 103 is pressure-pad-force adjusting nut 103, by screwing or unscrewing 103 adjusting screw rod 101 of adjusting nut
Length, the decrement for changing compression spring 102 is adjusted to the pressure-pad-force of pressure plate 5, and then is risen or put down pressure plate 5, into
Row compresses plate 11 or handling plate.Gasket can also be placed between compression spring 102 and adjusting nut 103.
Pressure-pad-force adjustment module is used to adjust the pressure-pad-force of pressure plate pressing plate, by adjusting in pressure-pad-force adjustment module
Adjusting nut 103 change amount of spring compression, and then adjust pressure plate to the pressure-pad-force of plate.The tool of pressure-pad-force adjustment module
Body running process are as follows: when needing to charge, unscrew pressure-pad-force adjusting nut 103, charge after putting down pressure plate.After charging, pressure is screwed
Side power adjusting nut 103 rises pressure plate, and obtains elasticity modulus according to required pressure-pad-force and compression spring and determine compression spring
Decrement.
Traditional pressure-pad-force adjusting method is the bolt that screws up with a wrench, and can not know accurate pressure-pad-force.And the present invention adopts
Flanging is carried out with bolt plus spring structure, pressure-pad-force can be calculated by spring downward amount and elasticity modulus, so with tradition electricity
Magnetic microsecond delay technique is only compared with the adjusting method that bolt carries out flanging, can be more convenient accurately to control pressure-pad-force.
Embodiment 2
Fig. 5 is the flow chart of the micro- blanking method of electromagnetism provided by the embodiment of the present invention 2.Referring to Fig. 5, a kind of micro- punching of electromagnetism
Sanction method, the micro- blanking apparatus of electromagnetism applied to embodiment 1.
The micro- blanking method of electromagnetism includes:
Step 201, punching parameter is obtained.Being punched parameter includes: discharge voltage parameter, discharge capacity size, punch diameter
And cavity plate bore dia etc..Specifically include: according to the shape of plate to be formed, thickness and micropore size to be formed, determine at
Formed punch size used, cavity plate aperture, discharge capacity size and discharge voltage when shape.
Step 202, plate to be formed is placed between pressure plate and cavity plate.
Step 203, it adjusts pressure-pad-force adjustment module and compresses plate.It specifically includes: according to the required big minor adjustment of pressure-pad-force
Adjusting nut in pressure-pad-force adjustment module.
Step 204, it is powered to coil, starts to be punched.It is discharged by power-supply system form-wound coil.Form-wound coil after electric discharge
In driving plate induction generate vortex, and to driving plate generate repulsive force, driving plate drive formed punch moved to cavity plate, to plate into
Row Blanking Shaping.
Step 205, it after punching, adjusts pressure-pad-force adjustment module and takes out plate.It specifically includes: adjusting pressure-pad-force and adjust
Nut removes the plate that forming is taken out after the pressure-pad-force of pressure plate.
Embodiment 3
A kind of micro- blanking method of electromagnetism, the micro- blanking apparatus of electromagnetism applied to embodiment 1.The present embodiment and embodiment 2
The difference is that:
Step 1: according to material to be formed be the pure titanium sheet metal of TA1, material to be formed with a thickness of 100 μm, it is to be formed
Micro-pore diameter is the punching parameter of 1mm, and the punch diameter selected is 1.00mm, and cavity plate aperture is 1.01mm, discharge capacity 100
μ F, discharge voltage 2kV.
Step 2: adjusting pressure-pad-force adjusting nut and fall pressure plate, by the pure titanium sheet metal of TA1 be placed in pressure plate and cavity plate it
Between.
Step 3: it adjusts pressure-pad-force adjusting nut and rises pressure plate, and adjusting nut is screwed according to desired pressure-pad-force, make
Compression spring has specific decrement.
Step 4: after power-supply system is to coil discharge, lower layer is copper plate layer, the double-layer structure that upper layer is 45# steel plate layer
Driving plate drives formed punch to be quickly punched to thin plate.After punching, driving plate hits cushion rubber layer and halts.
Step 5: adjusting pressure-pad-force adjusting nut, remove pressure-pad-force, falls pressure plate, takes out thin plate, and punching is completed.
Embodiment 4
A kind of micro- blanking method of electromagnetism, the micro- blanking apparatus of electromagnetism applied to embodiment 1.The present embodiment and embodiment 3
The difference is that:
Step 1: according to material to be formed be AZ31 magnesium alloy plate, material to be formed with a thickness of 400 μm, it is to be formed
Micro-pore diameter be 2mm punching parameter, the punch diameter selected be 2.00mm, and cavity plate aperture is 2.04mm, and discharge capacity is
100 μ F, discharge voltage 5kV.
Step 2: it adjusts pressure-pad-force adjusting nut and falls pressure plate, AZ31 magnesium alloy plate is placed in pressure plate and cavity plate
Between.
Step 3: it adjusts pressure-pad-force adjusting nut and rises pressure plate, and screw adjusting nut according to desired pressure-pad-force to make
Compression spring has specific decrement.
Step 4: after power-supply system is to coil discharge, lower layer is copper plate layer, the double-layer structure that upper layer is 45# steel plate layer
Driving plate drives formed punch to be quickly punched to magnesium alloy plate, and after punching, driving plate hits cushion rubber layer and halts.
Step 5: adjusting pressure-pad-force adjusting nut, remove pressure-pad-force, falls pressure plate, takes out magnesium alloy plate, has been punched
At.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright 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, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (9)
1. a kind of micro- blanking apparatus of electromagnetism, which is characterized in that fixed including pedestal, coil, driving plate, formed punch, cavity plate, cavity plate
Plate, pressure plate and oriented module；
The coil is connect with the whorl of base；
The driving plate is located above the coil；
The formed punch is fixed in the driving plate, and the cavity plate is directed toward in the punching direction of the formed punch；
The lower surface of the die block has the groove being recessed upwards, and the cavity plate is fixed in the groove；
The lower surface of the cavity plate has the cavity plate groove being recessed upwards, the recess of the size of the formed punch and the cavity plate groove
Size matches；
Plate to be formed is placed between the formed punch and the cavity plate；
The pressure plate is located at the lower section of the die block, and Chong Die with the female mold part；
The pressure plate is for pressing up the plate in the cavity plate；
One end of the oriented module is slidably connected with the driving plate, and the other end is fixedly connected with the die block；
The oriented module is for being oriented to the vertical motion of the driving plate.
2. the micro- blanking apparatus of electromagnetism according to claim 1, which is characterized in that further include: power-supply system；The power supply system
System is electrically connected with the coil；The power-supply system is used to be the coil power supply.
3. the micro- blanking apparatus of electromagnetism according to claim 1, which is characterized in that further include: buffer module；The buffering mould
Block is for buffering the upward impact force of the driving plate；
The buffer module includes: limit plate, buffer medium and pillar；
One end of the pillar is bolted with the die block, and the upper surface of the other end and the limit plate passes through
It is bolted；
The lower surface bonds of the buffer medium and the limit plate；
The limit plate is for preventing the formed punch from colliding the die block；
The buffer medium is hit for preventing the driving plate and the limit plate from hardness occurs.
4. the micro- blanking apparatus of electromagnetism according to claim 1, which is characterized in that further include: pressure-pad-force adjustment module；
The pressure-pad-force adjustment module includes: screw rod, compression spring and adjusting nut；
Pressure-pad-force adjustment hole is equipped on the pressure plate and the die block；The screw rod passes through the pressure from bottom to up
Side power adjustment hole sequentially passes through the pressure plate and the die block, and holds the pressure plate；
The pressure spring set is pierced by the part of the die block in the screw rod；
The adjusting nut is placed on the compression spring, and is connect with the screw flight；
The pressure-pad-force adjustment module is for adjusting the pressure-pad-force that the pressure plate presses the plate.
5. the micro- blanking apparatus of electromagnetism according to claim 1, which is characterized in that the oriented module includes: guide sleeve and leads
Column；
The driving plate is equipped with dowel hole, and the guide sleeve is placed in the dowel hole, and Nian Jie with the dowel hole；
One end of the guide post and the guide sleeve, which roll, to be connected, and the other end is connect by bolt with the die block.
6. the micro- blanking apparatus of electromagnetism according to claim 1, which is characterized in that the driving plate be one layer or one layer with
Upper structure, and at least one layer of is high conductivity material.
7. the micro- blanking apparatus of electromagnetism according to claim 6, which is characterized in that at least one layer of the driving plate for copper or
Aluminium or copper alloy or aluminium alloy.
8. the micro- blanking apparatus of electromagnetism according to claim 1, which is characterized in that the plate is sheet metal, with a thickness of
0.05~1mm.
9. a kind of micro- blanking method of electromagnetism, which is characterized in that micro- applied to the electromagnetism as described in claim 1~8 any one
Blanking apparatus；
The micro- blanking method of electromagnetism includes:
Obtain punching parameter；
Plate to be formed is placed between pressure plate and cavity plate；
It adjusts pressure-pad-force adjustment module and compresses the plate to be formed；
It is powered to coil, starts to be punched；
After punching, the plate that the pressure-pad-force adjustment module takes out forming is adjusted.
Priority Applications (1)
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| CN201910247945.6A CN109807222B (en) | 2019-03-29 | 2019-03-29 | Electromagnetic micro-blanking device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910247945.6A CN109807222B (en) | 2019-03-29 | 2019-03-29 | Electromagnetic micro-blanking device and method |
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| CN109807222A true CN109807222A (en) | 2019-05-28 |
| CN109807222B CN109807222B (en) | 2020-04-28 |
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| CN201889519U (en) * | 2010-12-03 | 2011-07-06 | 天水锻压机床有限公司 | Pressure plate device for closed steel plate edge milling machine |
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| Publication number | Publication date |
|---|---|
| CN109807222B (en) | 2020-04-28 |
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