CN202307402U - Interval type winding rotating magnetic field generating device - Google Patents
Interval type winding rotating magnetic field generating device Download PDFInfo
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- CN202307402U CN202307402U CN2011204229295U CN201120422929U CN202307402U CN 202307402 U CN202307402 U CN 202307402U CN 2011204229295 U CN2011204229295 U CN 2011204229295U CN 201120422929 U CN201120422929 U CN 201120422929U CN 202307402 U CN202307402 U CN 202307402U
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- iron core
- magnetic field
- excitation winding
- winding
- rotating magnetic
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- 238000004804 winding Methods 0.000 title claims abstract description 122
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000009413 insulation Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000005284 excitation Effects 0.000 claims description 77
- 230000001681 protective effect Effects 0.000 claims description 36
- 239000007787 solid Substances 0.000 claims description 28
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 2
- 238000000576 coating method Methods 0.000 abstract description 18
- 239000000463 material Substances 0.000 abstract description 10
- 238000004372 laser cladding Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 14
- 230000008018 melting Effects 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 239000010949 copper Substances 0.000 description 9
- 238000002844 melting Methods 0.000 description 8
- 238000012546 transfer Methods 0.000 description 7
- 230000005611 electricity Effects 0.000 description 6
- 239000003292 glue Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000011162 core material Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 239000012467 final product Substances 0.000 description 3
- 229910001338 liquidmetal Inorganic materials 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model provides an interval type winding rotating magnetic field generating device, which belongs to the technical field of surface modified devices and comprises a plurality of pairs of iron cores evenly distributed along the circumference, a plurality of pairs of exciting windings evenly distributed along the circumference, magnetic heads, an iron core fixing base plate, an exciting winding internal protection cover, an exciting winding external protection cover and heat insulation plates. The lower ends of the iron cores are fixed on the iron core fixing base plate, the exciting winding external protection cover and the exciting winding internal protection cover are respectively fixed on an inner ring and an outer ring of the iron core fixing base plate and cover the exciting windings in a cavity formed between the exciting winding external protection cover and the exciting winding internal protection cover, and the heat insulation plates are fixed on the upper surfaces of the exciting winding internal protection cover and the exciting winding external protection cover. A rotating magnetic field is generated by powering on and powering off the exciting windings in sequence and used for structure and performance optimization of material surface laser cladding coatings, the rotating magnetic field is added to work pieces in laser cladding, and microstructure improvement and surface comprehensive performance improvement in a laser cladding process are achieved. The interval type winding rotating magnetic field generating device has the advantages of being miniaturized, easy to assemble and dissemble and the like, can perform magnetizing processing in a small environment space, and meets magnetizing processing requirements in various working conditions.
Description
Technical field
The utility model provides a kind of compartment winding rotating magnetic field generation device, and particularly a kind of rotating magnetic field generation device that is used for material surface laser melting coating composite coating microstructure and performance optimization belongs to surface modification equipment technology field.
Background technology
Along with laser melting coating process for modifying surface in recent years in the further extensive use in fields such as biology, Aeronautics and Astronautics, machinery, material, metallurgy, mine, nuclear power, heterogeneous microstructure, physical and chemical performance, mechanical property, photoelectric properties and the biomedical performance etc. of laser melting coating modified coating have been proposed increasingly high requirement.But defectives such as pore and crackle are organized inadequately evenly, are prone to laser cladding coating ubiquity cladding layer.In order effectively to remedy the deficiency of laser melting coating, give full play to its advantage, Recent study personnel propose the new approaches of welding of externally-applied magnetic field auxiliary laser and laser melting coating.According to domestic and international existing research and report, the form of externally-applied magnetic field has longitudinal magnetic field, transverse magnetic field etc., but these magnetic fields all belong to the magnetic field under the static state, and Distribution of Magnetic Field is confined to the certain spatial position, and the direction of the magnetic line of force is fixing all the time.Prove through experimental study; The magnetic field of these static form can both produce certain influence to metal flow in the molten bath in laser welding, the laser cladding process and crystallization; Thereby influence the mass transfer and the diabatic process of metal in the molten bath, so that improve its technology, improve the quality of modified layer.
Though static magnetic field can exert an influence to the mass transfer and the heat transfer of metal in the molten bath, static magnetic field at a time can only influence mass transfer and diabatic process to metal in the molten bath on specific direction.Therefore, still there is bigger limitation in static magnetic field to improving technology.If can develop a kind of multi-direction technology that influences molten pool metal mass transfer and heat transfer that has, to the further microstructure form of improving the laser melting coating composite coating, the surface comprehensive performance that improves laser cladding coating will have crucial meaning.
Summary of the invention
The purpose of the utility model is the deficiency that overcomes existing laser melting coating equipment static magnetic field; A kind of compartment winding rotating magnetic field generation device is provided; For laser melting and coating process provides rotating magnetic field; Impel the liquid metal motion in the molten bath, improve flowing and crystalline characteristics of liquid metal, optimize the institutional framework and the comprehensive surface property of coating of laser cladding coating.
The technical scheme of the utility model is: the compartment winding produces the device of rotating magnetic field; Comprise along circumference equally distributed many to iron core 2 and cover solid on it excitation winding 6, be loaded on the many of every pair of iron core 2 upper ends to protective cover 4 and thermal insulation board 11 in magnetic head 1, iron core fixed underpan 5, excitation winding outer protective cover 3, the excitation winding; Nut 8 matching and fixing are passed through on iron core fixed underpan 5 in iron core 2 lower ends; Excitation winding outer protective cover 3 and interior protective cover 4 are separately fixed on the Internal and external cycle of iron core fixed underpan 5 and with excitation winding 6 and cover in its cavity that forms each other, and thermal insulation board 11 is fixed on the upper surface of the inside and outside protective cover 3 of excitation winding and 4.
Said excitation winding 6 comprises winding fixed charge method end plate 9 and is fixed in the hold-down nut 7 of iron core upper and lower end; Evenly be fixed on the fixing solid column 12 of lattice coil on the upper and lower winding fixed charge method end plate 9 from the inside to the outside along the border and be wound on the coil on the fixing solid column 12 of every layer line circle, keep a determining deviation between every layer line circle.The number of plies of the solid column 12 of coil stationary is 2 ~ 8 layers, and every layer has 4 ~ 12 solid columns, and every solid column is the metal upright post of diameter 3 ~ 5mm, and the spacing between every layer line circle is 1 ~ 3mm, to guarantee that certain heat radiation gap is arranged between every layer line circle.Spacing between the number of plies of solid column 12, the quantity of every layer of solid column and the every layer line circle is all confirmed in given range according to actual needs, guarantees to form enough magnetic field intensitys and gets final product with heat radiation.
The quantity of said magnetic head 1, iron core 2 and excitation winding 6 is 2 ~ 6 pairs, every pair of magnetic head 1, iron core 2 and excitation winding 6 be spaced apart 30 ~ 90 °.Magnetic head 1 is the bar column construction, and itself and thermal insulation board 11 be the slit of 1 ~ 5mm at interval, and the opposed assembling that is in line of every pair of magnetic head.The gap length of the quantity of iron core 2, excitation winding 6 and magnetic head 1 and magnetic head 1 and thermal insulation board 11 is selected to confirm according to actual needs in given range, guarantees to form enough magnetic field intensitys and gets final product.The section of magnetic head 1 and iron core 2 can be circle, square etc., and its material can be pure iron, ferro-silicium (like silicon steel), iron nickel system alloy, ferroaluminium, amorphous magnetic material, ferrite etc.
Said excitation winding outer protective cover 3 thick 1～5mm have the louvre of a plurality of diameter 1～20mm on it, can be processed by sheet metals such as ordinary copper, steel, iron.The thickness of protective cover 3 and the quantity that goes up louvre thereof are confirmed according to actual needs, guarantee the protection of winding is got final product with normal heat radiation.Protective cover 4 can adopt heat-barrier material to process in the excitation winding.
Said magnetic head 1 is connected set bolt 10 with iron core 2 through the magnetic head iron core and connects fixing; The solid column 12 of coil stationary is fixed on the excitation winding fixed charge method end plate 9 through threaded engagement; Excitation winding outer protective cover 3 is connected fixing with iron core fixed underpan 5 through high-temperature insulation glue; Protective cover 4 is connected sealing and fixing with iron core fixed underpan 5 through high-temperature insulation glue in the excitation winding, and thermal insulation board 11 is fixedly connected and seals through high-temperature insulation glue with the interior protective cover 4 of excitation winding outer protective cover 3 and excitation winding.
The utility model is through realizing the rotation in magnetic field to evenly spaced apart many of same circumference excitation winding being carried out order switching electricity, and the size of the break-make electricity time interval, cycle and the exciting current of every pair of excitation winding all can be regulated separately.
This device is through producing rotating magnetic field at the even many order switching electricity to excitation winding spaced apart of same circumference; Through the size of the electric time interval of the order break-make of regulating excitation winding and cycle and exciting current, can realize the size variation of magnetic field speed and magnetic field intensity easily.The speed through changing this rotating magnetic field and the size of exciting current can be convenient and improve laser melting and coating process effectively, improve the mass transfer and the diabatic process of liquid metal in the molten bath.Each winding center line circle adopts compartment to distribute, and the heat that coil produces between layer and the layer is not superposeed, thereby guarantee that every layer line circle can not burn out because of power is excessive; Have louvre on the excitation winding outer protective cover simultaneously, help the coil cooling.Have advantages such as miniaturization, dismounting in addition, can in less environment space, magnetize processing, satisfy the needs that magnetization is handled under various engineerings and the working condition.
Description of drawings
Fig. 1 looks sketch map for the utility model master;
Fig. 2 looks sketch map for the utility model mansion;
Fig. 3 is the utility model A-A cross-sectional schematic;
Fig. 4 is the utility model schematic diagram;
Fig. 5 is the process sketch map that the utility model embodiment 1 winding 1-1' produces rotating magnetic field;
Fig. 6 is the process sketch map that the utility model embodiment 1 winding 2-2' produces rotating magnetic field;
Fig. 7 is the process sketch map that the utility model embodiment 1 winding 3-3' produces rotating magnetic field.
Each label is followed successively by among the figure: the 1-magnetic head; The 2-iron core; 3-excitation winding outer protective cover; Protective cover in the 4-excitation winding; 5-iron core fixed underpan; The 6-excitation winding; 7-excitation winding end plate hold-down nut; The 8-hold-down nut; Excitation winding fixed charge method end plate 9; 10-magnetic head iron core connects set bolt; The 11-thermal insulation board; The solid column of 12-coil stationary.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is done further to set forth, but the protection range of the utility model is not limited to said content.
Embodiment 1: referring to Fig. 1,2,3; This compartment winding produces the device of rotating magnetic field; Comprise along the equally distributed 3 pairs of iron cores 2 of circumference and consolidate protective cover 4 and thermal insulation board 11 in excitation winding 6 on it, 3 pairs of magnetic heads 1 that are loaded on every pair of iron core 2 upper ends, iron core fixed underpan 5, excitation winding outer protective cover 3, the excitation winding with cover; Nut 8 matching and fixing are passed through on iron core fixed underpan 5 in iron core 2 lower ends; Excitation winding outer protective cover 3 and interior protective cover 4 are separately fixed on the Internal and external cycle of iron core fixed underpan 5 and with excitation winding 6 and cover in its cavity that forms each other, and thermal insulation board 11 is fixed on the upper surface of the inside and outside protective cover 3 of excitation winding and 4.Each excitation winding 6 comprises winding fixed charge method end plate 9 and is fixed in the hold-down nut 7 of iron core upper and lower end; Evenly be fixed on the fixing solid column 12 of 6 layer line circles on the upper and lower winding fixed charge method end plate 9 from the inside to the outside along the border and be wound on the coil on the fixing solid column 12 of every layer line circle; Every layer of copper solid column that 4 diameter 5mm are arranged, spacing is 3mm between every layer line circle.
The material of magnetic head 1 and iron core 2 is that the material of Q235 steel, excitation winding outer protective cover 3 is that thickness is the copper sheet of 2mm, and the louvre diameter is 1mm, and louvre quantity is 2000.The material of protective cover 4 is the high temperature resistant heat insulation plate in the excitation winding, and the material of iron core fixed underpan 5 is the Q235 steel, and the excitation winding line adopts the enamel covered wire of 1mm, and the material of excitation winding fixed charge method end plate 9 is an insulation board.
The utility model is through realizing the rotation in magnetic field to evenly spaced apart many of same circumference excitation winding being carried out order switching electricity, and the size of the break-make electricity time interval, cycle and the exciting current of every pair of excitation winding all can be regulated separately.
Like Fig. 4,5,6, shown in 7; 3 pairs of magnetic heads 1, iron core and winding intervals are distributed on the same circumference for 60 °; When order is given 3 couples of excitation winding 1-1', 2-2', 3-3' break-make electricity; Just produce magnetic field in the space that excitation winding pole coil surrounded, the magnetic field of generation makes the magnetization of the iron core in the excitation winding magnetic line of force transmit on the magnetic head direction along iron core.The process that rotating magnetic field produces is when order is given excitation winding 1-1' energising; Just produce magnetic field in the space that this excitation winding pole coil surrounded; The magnetic field that produces is the magnetization of the iron core in the excitation winding, make the magnetic line of force along iron core to the magnetic head direction on transmission (referring to Fig. 5).When order is given excitation winding 2-2' energising, just produce magnetic field in the space that this excitation winding pole coil surrounded, the magnetic field of generation is the magnetization of the iron core in the excitation winding, make the magnetic line of force along iron core to the magnetic head direction on transmission (referring to Fig. 6).When order is given excitation winding 3-3' energising, just produce magnetic field in the space that this excitation winding pole coil surrounded, the magnetic field of generation is the magnetization of the iron core in the excitation winding, make the magnetic line of force along iron core to the magnetic head direction on transmission (referring to Fig. 7).According to the characteristics and the arts demand of laser melting coating weld pool solidifies crystallization process, can carry out simultaneously also that 3 pairs of excitation winding are switched on simultaneously or wherein any two groups switch on simultaneously.
Embodiment 2: referring to Fig. 1,2; This compartment winding rotating magnetic field generation device is identical with embodiment 1; Difference is: have 6 pairs of magnetic heads, iron core and excitation winding; Every pair of magnetic head, iron core and excitation winding be spaced apart 30 °, magnetic head and thermal insulation board be spaced apart 3mm, and every pair of magnetic head opposed assembling that is in line.Each excitation winding has 2 layer line circles to fix solid column, every layer of solid column of steel that 12 diameter 3mm are arranged, and spacing is 1mm between every layer line circle.Magnetic head and core material are silicon steel, and its section is square; Outer protective cover is processed by the steel plate of thick 5mm, and the louvre of 500 diameter 20mm is arranged on it.
Embodiment 3: referring to Fig. 1,2; This compartment winding rotating magnetic field generation device is identical with embodiment 1; Difference is: have 4 pairs of magnetic heads, iron core and excitation winding; Every pair of magnetic head, iron core and excitation winding be spaced apart 45 °, magnetic head and thermal insulation board be spaced apart 4mm, and every pair of magnetic head opposed assembling that is in line.Each excitation winding has 4 layer line circles to fix solid column, every layer of copper solid column that 8 diameter 3mm are arranged, and spacing is 2mm between every layer line circle.Magnetic head and core material are ferrite, and its section is circle; Outer protective cover is processed by the copper coin of thick 1mm, and the louvre of 100 diameter 10mm is arranged on it.
Embodiment 4: referring to Fig. 1,2; This compartment winding rotating magnetic field generation device is identical with embodiment 1; Difference is: have 5 pairs of magnetic heads, iron core and excitation winding; Every pair of magnetic head, iron core and excitation winding be spaced apart 36 °, magnetic head and thermal insulation board be spaced apart 4mm, and every pair of magnetic head opposed assembling that is in line.Each excitation winding has 8 layer line circles to fix solid column, every layer of copper solid column that 6 diameter 4mm are arranged, and spacing is 3mm between every layer line circle.Magnetic head and core material are iron-nickel alloy, and its section is square; Outer protective cover is processed by the copper coin of thick 3mm, and the louvre of 1500 diameter 3mm is arranged on it.
Embodiment 5: referring to Fig. 1,2; This compartment winding rotating magnetic field generation device is identical with embodiment 1; Difference is: have 2 pairs of magnetic heads, iron core and excitation winding; Every pair of magnetic head, iron core and excitation winding be spaced apart 90 °, magnetic head and thermal insulation board be spaced apart 1mm, and every pair of magnetic head opposed assembling that is in line.Each excitation winding the have three layers solid column of coil stationary, every layer of copper solid column that 4 diameter 3mm are arranged, spacing is 2mm between every layer line circle.Magnetic head and core material are iron-nickel alloy, and its section is square; Outer protective cover is processed by the copper coin of thick 2mm, and the louvre of 1000 diameter 5mm is arranged on it.
Claims (7)
1. compartment winding rotating magnetic field generation device; It is characterized in that: comprise along circumference equally distributed many to iron core (2) and cover solid on it excitation winding (6), be loaded on the many of every pair of iron core (2) upper end to protective cover (4) and thermal insulation board (11) in magnetic head (1), iron core fixed underpan (5), excitation winding outer protective cover (3), the excitation winding; Iron core (2) lower end is fixed on the iron core fixed underpan (5); Excitation winding outer protective cover (3) and interior protective cover (4) are separately fixed on the Internal and external cycle of iron core fixed underpan (5) and with excitation winding (6) and cover in its cavity that forms each other, and thermal insulation board (11) is fixed on the upper surface of the inside and outside protective cover of excitation winding (3) and (4).
2. compartment winding rotating magnetic field generation device according to claim 1; It is characterized in that: excitation winding (6) comprises winding fixed charge method end plate (9) and is fixed in the hold-down nut (7) of iron core upper and lower end; Evenly be fixed on the fixing solid column (12) of lattice coil on the upper and lower winding fixed charge method end plate (9) from the inside to the outside along the border and be wound on the coil on the fixing solid column (12) of every layer line circle, keep a determining deviation between every layer line circle.
3. compartment winding rotating magnetic field generation device according to claim 2; It is characterized in that: the number of plies of the solid column of coil stationary (12) is 2 ~ 8 layers; Every layer has 4 ~ 12 solid columns, the every metal upright post that solid column is diameter 3 ~ 5mm, and the spacing between every layer line circle is 1 ~ 3mm.
4. compartment winding rotating magnetic field generation device according to claim 1; It is characterized in that: the quantity of magnetic head (1), iron core (2) and excitation winding (6) is 2 ~ 6 pairs, every pair of magnetic head (1), iron core (2) and excitation winding (6) be spaced apart 30 ~ 90 °.
5. compartment winding rotating magnetic field generation device according to claim 1 is characterized in that: magnetic head (1) is the bar column construction, the at interval certain slit of itself and thermal insulation board (11), and the opposed assembling that is in line of every pair of magnetic head.
6. compartment winding rotating magnetic field generation device according to claim 5 is characterized in that: the gap between magnetic head (1) and the thermal insulation board (11) is 1 ~ 5mm.
7. compartment winding rotating magnetic field generation device according to claim 1 is characterized in that: the thick 1～5mm of excitation winding outer protective cover (3) has the louvre of a plurality of diameter 1～20mm on it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204229295U CN202307402U (en) | 2011-10-31 | 2011-10-31 | Interval type winding rotating magnetic field generating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204229295U CN202307402U (en) | 2011-10-31 | 2011-10-31 | Interval type winding rotating magnetic field generating device |
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| Publication Number | Publication Date |
|---|---|
| CN202307402U true CN202307402U (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204229295U Expired - Fee Related CN202307402U (en) | 2011-10-31 | 2011-10-31 | Interval type winding rotating magnetic field generating device |
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| Country | Link |
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| CN (1) | CN202307402U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385968A (en) * | 2011-10-31 | 2012-03-21 | 昆明理工大学 | Device for generating rotating magnetic field by interval type windings |
| CN106392072A (en) * | 2016-10-20 | 2017-02-15 | 中国人民解放军装甲兵工程学院 | Magnetic control laser cladding forming device and method |
| CN114939722A (en) * | 2022-07-01 | 2022-08-26 | 内蒙古工业大学 | Rotary direct-current electromagnetic field assisted laser welding device and using method |
-
2011
- 2011-10-31 CN CN2011204229295U patent/CN202307402U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102385968A (en) * | 2011-10-31 | 2012-03-21 | 昆明理工大学 | Device for generating rotating magnetic field by interval type windings |
| CN106392072A (en) * | 2016-10-20 | 2017-02-15 | 中国人民解放军装甲兵工程学院 | Magnetic control laser cladding forming device and method |
| CN106392072B (en) * | 2016-10-20 | 2020-04-10 | 中国人民解放军装甲兵工程学院 | Magnetic control laser cladding forming equipment and method |
| CN114939722A (en) * | 2022-07-01 | 2022-08-26 | 内蒙古工业大学 | Rotary direct-current electromagnetic field assisted laser welding device and using method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20141031 |
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| EXPY | Termination of patent right or utility model |