CN110729863B - Motor iron core processing method - Google Patents
Motor iron core processing method Download PDFInfo
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- CN110729863B CN110729863B CN201910992440.2A CN201910992440A CN110729863B CN 110729863 B CN110729863 B CN 110729863B CN 201910992440 A CN201910992440 A CN 201910992440A CN 110729863 B CN110729863 B CN 110729863B
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- hydraulic cylinder
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 238000003672 processing method Methods 0.000 title claims abstract description 13
- 229910000976 Electrical steel Inorganic materials 0.000 claims abstract description 156
- 238000003475 lamination Methods 0.000 claims abstract description 114
- 238000003825 pressing Methods 0.000 claims abstract description 54
- 238000005520 cutting process Methods 0.000 claims abstract description 37
- 239000003292 glue Substances 0.000 claims abstract description 30
- 239000011888 foil Substances 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 238000010892 electric spark Methods 0.000 claims abstract description 16
- 238000005498 polishing Methods 0.000 claims abstract description 12
- 238000003754 machining Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 37
- 239000000853 adhesive Substances 0.000 claims description 11
- 230000001070 adhesive effect Effects 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000011889 copper foil Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 239000010959 steel Substances 0.000 abstract 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- 238000009413 insulation Methods 0.000 description 3
- 238000009763 wire-cut EDM Methods 0.000 description 3
- 244000137852 Petrea volubilis Species 0.000 description 2
- 239000002313 adhesive film Substances 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention provides a motor iron core processing method, which comprises the following steps: immersing each silicon steel sheet into the glue solution, taking out and airing for a preset time; pressing a plurality of stacked silicon steel sheets according to a preset lamination coefficient to form silicon steel laminations; polishing the periphery of the pressed silicon steel lamination, and wrapping the periphery of the silicon steel lamination by using a conductive metal foil; processing a positioning hole on the upper surface of the silicon steel lamination; polishing the upper and lower surfaces of the silicon steel lamination, and processing the silicon steel lamination into a motor iron core by using an electric spark cutting machine with the positioning hole as a cutting reference; the conductive metal foil is used for wrapping the silicon steels, so that the silicon steel sheets which are insulated from each other can be mutually conducted, and the conductivity of the silicon steel laminated workpiece is increased; and before the cutting, polish to the upper and lower surface of silicon steel lamination, get rid of the insulating coating on silicon steel surface, further increased electric conductivity, ensure that silicon steel lamination work piece has good electric conductivity, and then improved machining efficiency.
Description
Technical Field
The invention belongs to the technical field of motor processing, and particularly relates to a motor iron core processing method.
Background
At present, most motors use silicon steel materials as magnetic iron cores, and when new motor products or small-batch trial motor products are researched and developed, the motor iron cores are usually machined by wire cut electrical discharge machining.
The electric spark wire cutting processing is to utilize the positive and negative electrodes to discharge to generate electric sparks, and the instantaneous high temperature of the electric sparks melts the metal at the local part of the processed piece, thereby realizing the wire cutting processing. The wire cut electrical discharge machining principle determines that a machined workpiece has good electrical conductivity, otherwise, the wire is frequently broken due to poor discharge in the machining process, and the machining process is seriously influenced. And the surface of the silicon steel material for manufacturing the motor iron core is coated with the insulating coating, so that the electrical conductivity of a machined part formed by stacking a plurality of silicon steel sheets is poor, and the motor iron core cannot be normally processed.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a motor iron core processing method, which is used for solving the technical problems that when a motor iron core is processed by a wire cut electrical discharge machining method in the prior art, the motor iron core cannot be normally processed and the processing efficiency is reduced due to poor conductivity of a processed part formed by stacking a plurality of silicon steel sheets.
The embodiment of the invention provides a motor iron core processing method, which comprises the following steps:
immersing each silicon steel sheet into the glue solution, taking out and airing for a preset time;
pressing the stacked silicon steel sheets according to a preset lamination coefficient to form a silicon steel lamination;
polishing the periphery of the pressed silicon steel lamination, and wrapping the periphery of the silicon steel lamination by using a conductive metal foil;
processing a positioning hole on the upper surface of the silicon steel lamination;
and after the upper surface and the lower surface of the silicon steel lamination are polished, cutting the silicon steel lamination by using the positioning hole as a cutting reference and using an electric spark cutting machine, and processing the silicon steel lamination into a motor core.
In the above-mentioned scheme, before immersing each silicon steel sheet in glue solution, include:
preparing the glue solution by using alcohol and glue, wherein the ratio of the alcohol to the glue is 1: 3.
In the above-mentioned scheme, according to the lamination coefficient that predetermines with a plurality of stack the silicon steel sheet is suppressed, include:
determining the stroke of the hydraulic cylinder in the first stage according to the lamination coefficient of the first pressing process, and performing primary pressing on the silicon steel sheet according to the stroke of the hydraulic cylinder in the first stage;
determining the stroke of the hydraulic cylinder at the second stage according to the lamination coefficient of the second pressing process, and performing secondary pressing on the silicon steel sheet according to the stroke of the hydraulic cylinder at the second stage;
and determining the stroke of the hydraulic cylinder at the third stage according to the lamination coefficient of the third pressing process, and pressing the silicon steel sheet for three times according to the stroke of the hydraulic cylinder at the third stage.
In the scheme, when the silicon steel sheet is pressed for one time according to the stroke of the first-stage hydraulic cylinder, the pressing time is 25-30 min.
In the scheme, when the silicon steel sheet is pressed for the second time according to the stroke of the first-stage hydraulic cylinder, the pressing time is 25-30 min.
In the scheme, when the silicon steel sheet is pressed for three times according to the stroke of the first-stage hydraulic cylinder, the pressing time is 2.5-3 hours.
In the above aspect, the metal foil includes: copper foil.
In the above-mentioned scheme, after the upper surface processing locating hole of silicon steel lamination, include:
and filling non-viscous conductive adhesive in the positioning hole and sealing the hole opening.
In the scheme, the preset time is 5-8 min.
In the scheme, the surface of the metal foil is coated with the viscous conductive adhesive.
The invention provides a motor iron core processing method, which comprises the following steps: immersing each silicon steel sheet into the glue solution, taking out and airing for a preset time; pressing the stacked silicon steel sheets according to a preset lamination coefficient to form a silicon steel lamination; polishing the periphery of the pressed silicon steel lamination, and wrapping the periphery of the silicon steel lamination by using a conductive metal foil; processing a positioning hole on the upper surface of the silicon steel lamination; after the upper surface and the lower surface of the silicon steel lamination are polished, the silicon steel lamination is cut by using an electric spark cutting machine by taking the positioning hole as a cutting reference, and the silicon steel lamination is processed into a motor iron core; therefore, the silicon steel sheets insulated from each other can be conducted with each other by wrapping the silicon steel sheets by the conductive metal foil, so that the conductivity of the silicon steel laminated workpiece is increased; and before the cutting, polish to the upper and lower surface of silicon steel lamination, get rid of the insulating coating on silicon steel surface for the silicon steel of upper and lower both sides contact surface exposes the iron substrate, has further increased electric conductivity, when utilizing the wire-electrode cutting of electric spark, ensures that the silicon steel lamination work piece has good electric conductivity, and then has ensured the stability that can process, has improved machining efficiency.
Drawings
Fig. 1 is a schematic flow chart of a motor core processing method according to a first embodiment of the present invention;
fig. 2 is a schematic view of a pressed silicon steel lamination according to a first embodiment of the present invention;
fig. 3 is a schematic view of the silicon steel laminations after being polished around the periphery according to the first embodiment of the invention;
fig. 4 is a schematic view of a silicon steel lamination for processing a positioning hole according to an embodiment of the present invention;
FIG. 5 is a schematic view of the upper and lower surfaces of a silicon steel laminate after polishing in accordance with one embodiment of the present invention;
fig. 6 is a schematic view illustrating the contact surfaces of the upper and lower surfaces and the jig are wrapped with metal foils according to an embodiment of the present invention.
Detailed Description
The invention provides a motor iron core processing method, which solves the technical problem that a motor iron core cannot be normally processed due to poor conductivity of a processed part formed by stacking a plurality of silicon steel sheets when the motor iron core is processed by a spark wire cutting method in the prior art, and comprises the following steps: immersing each silicon steel sheet into the glue solution, taking out and airing for a preset time; pressing the stacked silicon steel sheets according to a preset lamination coefficient to form a silicon steel lamination; polishing the periphery of the pressed silicon steel lamination, and wrapping the periphery of the silicon steel lamination by using a conductive metal foil; processing a positioning hole on the upper surface of the silicon steel lamination; and after the upper surface and the lower surface of the silicon steel lamination are polished, cutting the silicon steel lamination by using the positioning hole as a cutting reference and using an electric spark cutting machine, and processing the silicon steel lamination into a motor core.
The technical solution of the present invention is further described in detail by the accompanying drawings and the specific embodiments.
Example one
The embodiment provides a method for processing a motor iron core, as shown in fig. 1, the method includes:
s110, immersing each silicon steel sheet into the glue solution, taking out and airing for a preset time;
in this step, before each silicon steel sheet is immersed in the glue solution, the glue solution is prepared according to a preset ratio. The glue solution is prepared by alcohol and glue, and the ratio of the alcohol to the glue is 1: 3-1: 5.
Then, each silicon steel sheet is immersed in the glue solution, so that the glue is uniformly adhered to the two surfaces of each silicon steel sheet, and the bonding effect is improved; and the thickness of the adhesive film is reduced as much as possible so as to improve the lamination coefficient of the silicon steel sheet. Then taking out and airing the mixture for a preset time; the predetermined time is generally 5-8 min, preferably 6 min.
S111, pressing the stacked silicon steel sheets according to a preset lamination coefficient to form a silicon steel lamination;
stacking a plurality of silicon steel sheets with glue on the surfaces, and pressing the stacked silicon steel sheets according to a preset lamination coefficient to form a silicon steel lamination, wherein the specific implementation is as follows:
determining the corresponding hydraulic cylinder stroke in each pressing process based on the formula (1);
L＝100/M (1)
in the formula (1), L is the corresponding hydraulic cylinder stroke in each pressing process, and M is the lamination coefficient in each pressing process.
The method specifically comprises the following steps: and determining the stroke of the hydraulic cylinder in the first stage according to the lamination coefficient of the first pressing process, and pressing the silicon steel sheet for one time according to the stroke of the hydraulic cylinder in the first stage. The time of one-time pressing is 25-30 min.
Determining the stroke of a hydraulic cylinder at the second stage according to the lamination coefficient of the second pressing process, and performing secondary pressing on the silicon steel sheet according to the stroke of the hydraulic cylinder at the second stage; the secondary pressing time is 25-30 min.
And determining the stroke of the hydraulic cylinder at the third stage according to the lamination coefficient of the third pressing process, and pressing the silicon steel sheet for three times according to the stroke of the hydraulic cylinder at the third stage, wherein the time for pressing for three times is 2.5-3 h.
After the third pressing, the silicon steel laminations are formed, as shown in fig. 2.
S112, grinding the periphery of the pressed silicon steel lamination, and wrapping the periphery of the silicon steel lamination by using a conductive metal foil;
utilize sand paper or polisher to polish around the silicon steel lamination after the suppression to will polish glue all around, refer to fig. 3, then utilize the metallic foil that has electric conductivity to wrap up all around the silicon steel lamination, so that the silicon steel sheet of mutual insulation between the piece can switch on each other, increase the electric conductivity of silicon steel lamination work piece, wherein, the metallic foil can include: the copper foil and the inner side (the side in contact with the silicon steel lamination) of the metal foil are also coated with adhesive conductive adhesive.
S113, processing a positioning hole on the upper surface of the silicon steel lamination;
and then processing a positioning hole on the upper surface of the silicon steel lamination of the electric spark punching machine so as to ensure the cutting precision during cutting. After the positioning hole is processed, referring to fig. 4, the positioning hole is filled with a non-adhesive conductive adhesive, and the hole opening is sealed with an adhesive tape or a gasket.
And S114, polishing the upper surface and the lower surface of the silicon steel lamination, and cutting the silicon steel lamination by using the positioning hole as a cutting reference and using an electric spark cutting machine to process the silicon steel lamination into a motor core.
After sealing, polishing the upper and lower surfaces of the silicon steel lamination so that the iron matrix is exposed at the contact part of the upper and lower surfaces and the clamp to remove the insulation glue attached to the surface of the silicon steel, referring to fig. 5; the contact surfaces are then wrapped with copper foil to further improve the electrical conductivity of the silicon steel laminate, see figure 6.
After the wrapping is finished, the positioning holes are used as cutting reference, the silicon steel laminations are cut by the aid of the electric spark cutting machine according to a predesigned drawing, the silicon steel laminations can be machined into a whole set of rotor core of the motor at one time, and cutting accuracy and efficiency are improved.
The motor iron core processing method provided by the embodiment of the invention has the following beneficial effects that:
the embodiment of the invention provides a motor iron core processing method, which comprises the following steps: immersing each silicon steel sheet into the glue solution, taking out and airing for a preset time; pressing the stacked silicon steel sheets according to a preset lamination coefficient to form a silicon steel lamination; polishing the periphery of the pressed silicon steel lamination, and wrapping the periphery of the silicon steel lamination by using a conductive metal foil; processing a positioning hole on the upper surface of the silicon steel lamination; after the upper surface and the lower surface of the silicon steel lamination are polished, the silicon steel lamination is cut by using an electric spark cutting machine by taking the positioning hole as a cutting reference, and the silicon steel lamination is processed into a motor iron core; therefore, the silicon steel sheets insulated from each other can be conducted with each other by wrapping the silicon steel sheets by the conductive metal foil, so that the conductivity of the silicon steel laminated workpiece is increased; and before the cutting, polish to the upper and lower surface of silicon steel lamination, get rid of the insulating coating on silicon steel surface for the silicon steel of upper and lower both sides contact surface exposes the iron substrate, has further increased electric conductivity, when utilizing the wire-electrode cutting of electric spark, ensures that the silicon steel lamination work piece has good electric conductivity, and then has ensured the stability that can process, has improved machining efficiency and precision.
Example two
In practical application, the processing method provided by the first embodiment is used for processing the motor iron core, and the specific implementation is as follows:
preparing glue solution by using alcohol and glue, wherein the ratio of the alcohol to the glue is 1: 3. Then, each silicon steel sheet is immersed in the glue solution, so that the glue is uniformly adhered to the two surfaces of each silicon steel sheet, and the bonding effect is improved; and the thickness of the adhesive film is reduced as much as possible so as to improve the lamination coefficient of the silicon steel sheet. Then taking out and airing the mixture for a preset time; the preset time is 5 min.
Stacking a plurality of silicon steel sheets with glue on the surfaces, and pressing the stacked silicon steel sheets according to a preset lamination coefficient to form a silicon steel lamination, wherein the specific implementation is as follows:
determining the corresponding hydraulic cylinder stroke in each pressing process based on the formula (1);
L＝100/M (1)
in the formula (1), L is the corresponding hydraulic cylinder stroke in each pressing process, and M is the lamination coefficient in each pressing process.
The method specifically comprises the following steps: and determining the stroke of the hydraulic cylinder in the first stage according to the lamination coefficient of the first pressing process, and pressing the silicon steel sheet for one time according to the stroke of the hydraulic cylinder in the first stage. In the first stage, the lamination factor was 97%, thus determining a corresponding cylinder stroke of 103mm and a pressing time of 30 min.
Determining the stroke of a hydraulic cylinder at the second stage according to the lamination coefficient of the second pressing process, and performing secondary pressing on the silicon steel sheet according to the stroke of the hydraulic cylinder at the second stage; in the second stage, the lamination factor is 98%, thus determining the corresponding cylinder stroke of 102mm and the secondary pressing time of 30 min.
And determining the stroke of the hydraulic cylinder at the third stage according to the lamination coefficient of the third pressing process, and pressing the silicon steel sheet for three times according to the stroke of the hydraulic cylinder at the third stage, wherein the lamination coefficient is 99% at the third stage, so that the stroke of the corresponding hydraulic cylinder is 101mm, and the time for three times of pressing is 3 h.
And pressing for three times to form the silicon steel lamination.
Utilize sand paper or polisher to polish around the silicon steel lamination after the suppression to glue all around is polished off, then utilize the metallic foil that has electric conductivity to wrap up around the silicon steel lamination, so that the silicon steel sheet of mutual insulation can switch on each other between the piece, increases the electric conductivity of silicon steel lamination work piece, wherein, metallic foil can include: the copper foil and the inner side (the side in contact with the silicon steel lamination) of the metal foil are also coated with adhesive conductive adhesive.
And then processing a positioning hole on the upper surface of the silicon steel lamination of the electric spark punching machine so as to ensure the cutting precision during cutting. After the positioning hole is processed, non-viscous conductive adhesive is filled in the positioning hole, and the hole opening is sealed by using an adhesive tape or a sealing gasket.
After sealing, polishing the upper and lower surfaces of the silicon steel lamination to expose the iron matrix so as to remove the insulating glue attached to the surface of the silicon steel; and then the upper surface and the lower surface are wrapped by copper foils, so that the conductivity of the silicon steel lamination is further improved.
After the parcel lived, use the locating hole as the cutting benchmark, according to the drawing of predesigned, utilize the electric spark cutting machine to cut the silicon steel lamination, can once only process the silicon steel lamination into a whole set of rotor core of motor, because of the poor intermittent condition of emergence of electric conduction during the cutting among the prior art, improved cutting efficiency.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (9)
1. A motor iron core processing method is characterized by comprising the following steps:
immersing each silicon steel sheet into the glue solution, taking out and airing for a preset time;
pressing the stacked silicon steel sheets according to a preset lamination coefficient to form a silicon steel lamination;
polishing the periphery of the pressed silicon steel lamination so as to polish glue on the periphery of the silicon steel lamination, and then wrapping the periphery of the silicon steel lamination by utilizing a conductive metal foil so as to mutually conduct a plurality of stacked silicon steel sheets insulated from each other in the silicon steel lamination and increase the conductivity of the silicon steel lamination;
processing a positioning hole on the upper surface of the silicon steel lamination;
and polishing the upper surface and the lower surface of the silicon steel lamination, removing the insulating coating on the surface of the silicon steel lamination to expose the iron substrate from the silicon steel sheets on the contact surfaces of the upper side and the lower side, and cutting the silicon steel lamination by using an electric spark cutting machine by taking the positioning hole as a cutting reference to process the silicon steel lamination into a motor core.
2. The method according to claim 1, wherein said pressing a plurality of said silicon steel sheets stacked in accordance with a predetermined lamination factor comprises:
determining the stroke of a hydraulic cylinder in a first stage according to the lamination coefficient of a first pressing process, and performing primary pressing on the silicon steel sheet according to the stroke of the hydraulic cylinder in the first stage;
determining the stroke of a hydraulic cylinder at the second stage according to the lamination coefficient of the second pressing process, and performing secondary pressing on the silicon steel sheet according to the stroke of the hydraulic cylinder at the second stage;
and determining the stroke of a hydraulic cylinder at the third stage according to the lamination coefficient of the third pressing process, and pressing the silicon steel sheet for three times according to the stroke of the hydraulic cylinder at the third stage.
3. The method according to claim 2, wherein the silicon steel sheet is pressed for 25-30 min at one time according to the stroke of the first-stage hydraulic cylinder.
4. The method according to claim 2, wherein the pressing time is 25-30 min when the silicon steel sheet is subjected to secondary pressing according to the stroke of the second-stage hydraulic cylinder.
5. The method according to claim 2, wherein when the silicon steel sheet is pressed for three times according to the stroke of the third-stage hydraulic cylinder, the pressing time is 2.5-3 hours.
6. The method of claim 1, wherein the metal foil comprises: copper foil.
7. The method of claim 1, wherein the machining the locating holes on the upper surface of the silicon steel lamination comprises:
and filling non-viscous conductive adhesive in the positioning hole and sealing the hole opening.
8. The method of claim 1, wherein the predetermined time is 5-8 min.
9. The method of claim 1, wherein the surface of the metal foil is coated with a tacky conductive adhesive.
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| CN201910992440.2A CN110729863B (en) | 2019-10-18 | 2019-10-18 | Motor iron core processing method |
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| CN201910992440.2A CN110729863B (en) | 2019-10-18 | 2019-10-18 | Motor iron core processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703569A (en) * | 2016-04-11 | 2016-06-22 | 华北电力大学 | Fabrication method for amorphous alloy motor stator iron core |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105703569A (en) * | 2016-04-11 | 2016-06-22 | 华北电力大学 | Fabrication method for amorphous alloy motor stator iron core |
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Effective date of registration: 20230928 Address after: No. 025 Zhao'an Street, Qian'an Economic Development Zone, Tangshan City, Hebei Province, 064400 Patentee after: SHOUGANG ZHIXIN QIAN'AN ELECTROMAGNETIC MATERIALS Co.,Ltd. Address before: 064400 No. 025, Zhao an street, western industrial area, Qian'an, Tangshan City, Hebei Patentee before: SHOUGANG ZHIXIN QIAN'AN ELECTROMAGNETIC MATERIALS Co.,Ltd. Patentee before: BEIJING SHOUGANG Co.,Ltd. |
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Address after: 064400 No. 025 Zhao'an Street, Qian'an Economic Development Zone, Tangshan City, Hebei Province Patentee after: Shougang Zhixin Electromagnetic Materials (Qian'an) Co.,Ltd. Country or region after: China Address before: No. 025 Zhao'an Street, Qian'an Economic Development Zone, Tangshan City, Hebei Province, 064400 Patentee before: SHOUGANG ZHIXIN QIAN'AN ELECTROMAGNETIC MATERIALS Co.,Ltd. Country or region before: China |