CN106670462B - A kind of 3D printing method with magnetic field substrate and the use substrate suitable for precinct laser fusion - Google Patents
A kind of 3D printing method with magnetic field substrate and the use substrate suitable for precinct laser fusion Download PDFInfo
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- CN106670462B CN106670462B CN201710014254.2A CN201710014254A CN106670462B CN 106670462 B CN106670462 B CN 106670462B CN 201710014254 A CN201710014254 A CN 201710014254A CN 106670462 B CN106670462 B CN 106670462B
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- 239000000758 substrate Substances 0.000 title claims abstract description 59
- 230000004927 fusion Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010146 3D printing Methods 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 35
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 22
- 230000008859 change Effects 0.000 claims description 3
- 235000012489 doughnuts Nutrition 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000000465 moulding Methods 0.000 description 11
- 230000007547 defect Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003319 supportive effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/30—Process control
- B22F10/38—Process control to achieve specific product aspects, e.g. surface smoothness, density, porosity or hollow structures
- B22F10/385—Overhang structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/30—Platforms or substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/60—Planarisation devices; Compression devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Automation & Control Theory (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The present invention relates to a kind of band magnetic field substrates suitable for precinct laser fusion, provide metal powder overhang upward magnetic field force, including hollow substrate, substrate end cap, powder compacting supporting mechanism, control mechanism；Substrate end cap is mounted on hollow substrate, surrounds hollow vessel；Powder compacting supporting mechanism includes upper metallic plate, lower metallic plate, multiple coils, the setting parallel with above and below lower metallic plate of upper metallic plate is in hollow vessel, multiple coils are evenly spaced in same level between upper metallic plate and lower metallic plate, circuit is both provided in upper metallic plate and lower metallic plate, the circuit of metallic plate, lower metallic plate in access in parallel is distinguished in upper end, the lower end of each coil；Control mechanism controls the break-make of each coil, and when connection, coil leads to direct current and generates upward magnetic field force.Further relate to the 3D printing method using the substrate.The present invention applies support force to overhang, solves the problems, such as uneven surface, belongs to 3D printing technique field.
Description
Technical field
The present invention relates to 3D printing techniques, specifically, are related to the band magnetic field substrate suitable for metal precinct laser fusion
With the 3D printing method using the substrate.
Background technology
The substrate of precinct laser fusion is one piece of common metallic plate at present, can only play a forming part bottom and fix
The surface quality for improving forming part overhang is gone in the effect of support without other any supplementary instruments or mechanism.When adjacent
Laser fusion lower layer and when the different metal powder area of upper layer twice, if rear laser-melted regions domain is molten more than a preceding laser
Change region, then that increased region is exactly overhang.For the research that avoids of pendency forming defect mainly from three sides
Start in face：Addition support molding, rotation angle molding, the molding of the powder self-supporting limit, but these types of scheme has itself
Limitation.(1) addition supports molding limitation to be embodied in：For with closing inner chamber part, support can not remove, for one
A little complex parts are that cannot to add support molding.(2) the molding limitation of rotation angle is embodied in：Rotation angle is molding most
Big feature is that part complexity and space are random, dangles and is molded with the presence of multiple dimensions in general part processing.Therefore in sky
Between under dimension constraint, can only avoid the pendency molding of dimension by adjusting putting for part.(3) the powder self-supporting limit at
Type：The defects of being difficult to avoid that dimensional accuracy defect (pendle), internal stress defect (warpage) and structure property defect (shrinkage cavity)
It generates.
Therefore, to develop 3D printing technique, pendency molding existing defects problem, the surface accuracy etc. for improving shaping workpiece is asked
Topic is badly in need of solving.
Invention content
For the technical problems in the prior art, the purpose of the present invention is：One kind is provided, magnetic field is generated by coil
The 3D printing method with magnetic field substrate and the use substrate for being suitable for precinct laser fusion that power is supported overhang.
In order to achieve the above object, the present invention adopts the following technical scheme that：
A kind of band magnetic field substrate suitable for precinct laser fusion provides metal powder overhang in upward magnetic field
Power, including hollow substrate, substrate end cap, powder compacting supporting mechanism, control mechanism；Substrate end cap is mounted on hollow substrate,
The two surrounds the hollow vessel for accommodating powder compacting supporting mechanism；Powder compacting supporting mechanism include upper metallic plate, lower metallic plate,
Parallel setting is in hollow vessel above and below multiple coils, upper metallic plate and lower metallic plate, and multiple coils are in same level
Be evenly spaced between metallic plate and lower metallic plate, be both provided with circuit in upper metallic plate and lower metallic plate, each coil it is upper
Hold the circuit of metallic plate in access in parallel, the circuit of metallic plate under the access of the lower end parallel connection of each coil；Control mechanism controls
The break-make of each coil, when connection, coil leads to direct current and generates upward magnetic field force.
As a preferred embodiment, hollow substrate upper end is plane, hollow substrate is opening down, and substrate end cap covers hollow substrate
Opening installation；Upper metallic plate and lower metallic plate are tablet, and lower metallic plate is fixed on the upper end of substrate end cap；Coil appearance is set
There is insulating layer.
It is switched as a preferred embodiment, control mechanism includes controller and protection.
As a preferred embodiment, multiple coils are arranged in a manner of rectangular array in same level, the line space of coil
Equal to column pitch.
As a preferred embodiment, multiple coils are arranged in multiple donuts in same level, in same annulus
Coil is arranged in a manner of annular array.
As a preferred embodiment, in overlook direction, coil is circle.The shape of coil can be elongated shape or short and thick
Type.
A kind of 3D printing method, using a kind of band magnetic field substrate suitable for precinct laser fusion, when one layer of metal of thawing
Powder, when which generates overhang, control mechanism connects the coil of the projection covering of overhang, which generates upward
Magnetic field force supports overhang.
As a preferred embodiment, the break-make of each coil becomes according to the trajectory coordinates of overhang in powder compacting supporting mechanism
Change and automatically adjusts；The trajectory coordinates for accessing circuit coil are consistent with the trajectory coordinates of overhang.
As a preferred embodiment, the controller of control mechanism according to each layer of metal powder from hollow substrate upper end away from
From selecting a certain size direct current so that the support force suffered by the metal powder of each layer of overhang is the same.
As a preferred embodiment, the direct current size of control flowing through coil is to control the size of magnetic field force.
The principle of the present invention is：Upward magnetic field force is generated by coil to be supported overhang；Coil is uniformly arranged
Cloth pixel arrays individually control the break-make of each coil, you can and control generates the region of magnetic field force, and coil configuration must be more,
Region control is finer；The size that control passes through the direct current of coil, you can control the size of magnetic field force.
Generally speaking, the invention has the advantages that：
(1) support force is applied to overhang, played a supportive role, pendency can be generated to avoid overhang in forming process
Object reduces molding original paper central pipe, solves the problems, such as uneven surface.
(2) dimensional accuracy of overhang can be improved, avoid tissue looseness, solve pendle mistake when molding complex parts
The problems such as more.
(3) operation principle is simple, at low cost, energy conservation and environmental protection, pollution-free.
(4) simple in structure, it is easy to make.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention.
Fig. 2 is the internal structure schematic diagram of the present invention.
Fig. 3 is the vertical view of coil.
Fig. 4 is the stereogram of hollow substrate.
Fig. 5 is the sectional view in hollow substrate main view direction.
Wherein, 1 is hollow substrate, and 2 be coil, and 3 be conducting wire, and 4 be protection switch, 5 devices in order to control, and 6 be upper metallic plate, 7
It is substrate end cap for lower metallic plate, 8.
Specific implementation mode
It is next below that the present invention will be further described in detail.
A kind of band magnetic field substrate suitable for precinct laser fusion provides metal powder overhang in upward magnetic field
Power, including hollow substrate, substrate end cap, powder compacting supporting mechanism, control mechanism.
Hollow substrate upper end is plane, is used to support forming part, and hollow substrate is opening down, and the covering of substrate end cap is hollow
The opening of substrate is installed, and the two surrounds the hollow vessel for accommodating powder compacting supporting mechanism.
Powder compacting supporting mechanism includes upper metallic plate, lower metallic plate, multiple coils, above and below upper metallic plate and lower metallic plate
Parallel setting in hollow vessel, multiple coils be evenly spaced in same level upper metallic plate and lower metallic plate it
Between.It is both provided with circuit in upper metallic plate and lower metallic plate, the circuit of metallic plate, each line in the access of the upper end parallel connection of each coil
The circuit of metallic plate under the access of the lower end parallel connection of circle, the break-make of each coil can independent control.Upper metallic plate and lower metallic plate are equal
For tablet, lower metallic plate is fixed on the upper end of substrate end cap；Coil appearance is equipped with insulating layer, to prevent coil and upper metallic plate, under
Metallic plate short circuit.Multiple coils are arranged in a manner of rectangular array in same level, and the line space of coil is equal to column pitch.
Control mechanism includes that the controller connected by conducting wire and protection switch, and is located at the outside of hollow vessel.Control machine
Structure controls the break-make of each coil, and when connection, coil leads to direct current and generates upward magnetic field force.
When 3D printing, computer output trajectory coordinate, laser fusion specifies the metal powder in region, forms one layer of preboarding
Shape.When the adjacent different metal powder area of laser fusion twice, if rear primary (upper layer) laser fusion region is primary more than preceding
(lower layer) laser fusion region, then that increased region is exactly overhang.3D metallic prints machine at work, is counted
Calculation machine controls the metal powder that region is specified in laser emitter fusing, due to the difference of forming part, in additive process certainly
Overhang can be encountered, each layer of trajectory coordinates of computer output model to controller, then controller according to delimiting the organizational structure in advance
Good program handles trajectory coordinates, first obtains the layer there are overhang, then obtains the trajectory coordinates of overhang again, finally
According to the algorithm of controller, hot-wire coil is needed in the trajectory coordinates of overhang where obtaining；Controller sends out instruction control
System needs in the coil being powered access circuit.
Stationary magnetic field is generated when coil leads to direct current, stationary magnetic field can generate metal powder certain support force, this branch
Support force just supports overhang metal powder.
The control process of the size of current of coil is：Metal powder often spreads one layer, then substrate decline, dropping distance with
One layer of metal powder consistency of thickness, controller with a distance from substrate, select the straight of a certain size according to each layer of metal powder
Galvanic electricity so that support force suffered by the metal powder of each layer of overhang is the same.
When computer does not detect that the appearance of overhang, computer will export a signal to controller, control
Device will control protection switch and disconnect.
In the present embodiment, the circuit of coil and upper metallic plate, lower metallic plate circuit connection type, control mechanism and electricity
The connection type on road is the prior art, and effect is individually to control the break-make of each coil.
Other than the mode that the present embodiment refers to, multiple coils are arranged in multiple donuts in same level, place
It is arranged in a manner of annular array in the coil of same annulus, the distance between annulus is equal.The region of all coils covering can
For rectangle, circle or other desired shape, the quantity and density of coil can be flexibly arranged according to actual needs.The shape of coil
Shape can be elongated shape or short-thick type.These mapping modes are within the scope of the invention.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (9)
1. a kind of band magnetic field substrate suitable for precinct laser fusion provides metal powder overhang upward magnetic field force,
It is characterized in that：Including hollow substrate, substrate end cap, powder compacting supporting mechanism, control mechanism；Substrate end cap is mounted on hollow
On substrate, the two surrounds the hollow vessel for accommodating powder compacting supporting mechanism；Powder compacting supporting mechanism include upper metallic plate, under
Parallel setting is in hollow vessel above and below metallic plate, multiple coils, upper metallic plate and lower metallic plate, and multiple coils are in same water
It is evenly spaced in plane between metallic plate and lower metallic plate, circuit, each line is both provided in upper metallic plate and lower metallic plate
The circuit of metallic plate in the access of the upper end parallel connection of circle, the circuit of metallic plate under the access of the lower end parallel connection of each coil；Control machine
Structure controls the break-make of each coil, and when connection, coil leads to direct current and generates upward magnetic field force；When melt one layer of metal powder,
When the layer generates overhang, control mechanism connects the coil of the projection covering of overhang, which generates upward magnetic field
Power supports overhang.
2. a kind of band magnetic field substrate suitable for precinct laser fusion described in accordance with the claim 1, it is characterised in that：Hollow base
Plate upper end is plane, and hollow substrate is opening down, and substrate end cap covers the opening installation of hollow substrate；Upper metallic plate and lower metal
Plate is tablet, and lower metallic plate is fixed on the upper end of substrate end cap；Coil appearance is equipped with insulating layer.
3. a kind of band magnetic field substrate suitable for precinct laser fusion described in accordance with the claim 1, it is characterised in that：Control machine
Structure includes that controller and protection switch.
4. a kind of band magnetic field substrate suitable for precinct laser fusion described in accordance with the claim 1, it is characterised in that：Multiple lines
Circle is arranged in a manner of rectangular array in same level, and the line space of coil is equal to column pitch.
5. a kind of band magnetic field substrate suitable for precinct laser fusion described in accordance with the claim 1, it is characterised in that：Multiple lines
Circle is arranged in multiple donuts in same level, and the coil in same annulus is arranged in a manner of annular array.
6. a kind of band magnetic field substrate suitable for precinct laser fusion described in accordance with the claim 1, it is characterised in that：It overlooks
On direction, coil is circle.
7. a kind of 3D printing method, using a kind of band suitable for precinct laser fusion described in any one of claim 1-6
Magnetic field substrate, it is characterised in that：The break-make of each coil becomes according to the trajectory coordinates of overhang in powder compacting supporting mechanism
Change and automatically adjusts；The trajectory coordinates for accessing circuit coil are consistent with the trajectory coordinates of overhang.
8. a kind of 3D printing method, using a kind of band suitable for precinct laser fusion described in any one of claim 1-6
Magnetic field substrate, it is characterised in that：The controller of control mechanism according to each layer of metal powder with a distance from hollow substrate upper end,
Select a certain size direct current so that the support force suffered by the metal powder of each layer of overhang is the same.
9. a kind of 3D printing method, using a kind of band suitable for precinct laser fusion described in any one of claim 1-6
Magnetic field substrate, it is characterised in that：The direct current size of flowing through coil is controlled to control the size of magnetic field force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710014254.2A CN106670462B (en) | 2017-01-09 | 2017-01-09 | A kind of 3D printing method with magnetic field substrate and the use substrate suitable for precinct laser fusion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710014254.2A CN106670462B (en) | 2017-01-09 | 2017-01-09 | A kind of 3D printing method with magnetic field substrate and the use substrate suitable for precinct laser fusion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106670462A CN106670462A (en) | 2017-05-17 |
| CN106670462B true CN106670462B (en) | 2018-10-30 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108621420B (en) * | 2018-04-10 | 2020-04-14 | 北京化工大学 | Magnetic force assisted forming 3D printing forming device and method |
| CN108971494B (en) * | 2018-09-12 | 2024-05-28 | 北京化工大学 | Wire-shaped metal direct melting 3D printing forming device |
| CN115365516B (en) * | 2022-07-15 | 2024-02-02 | 华中科技大学 | Fixed-point powder feeding device, selective laser melting forming equipment and method |
| CN115365518B (en) * | 2022-09-26 | 2023-03-24 | 浙江大学高端装备研究院 | Magnetic force auxiliary support-free direct-writing additive manufacturing device and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03107404A (en) * | 1989-09-22 | 1991-05-07 | Daido Steel Co Ltd | Method and apparatus for manufacturing metal powder |
| CN101856724A (en) * | 2010-06-13 | 2010-10-13 | 华南理工大学 | Selective laser melting forming device and method of medical magnesium alloy metal part |
| CN104325140A (en) * | 2014-11-18 | 2015-02-04 | 韶关学院 | Method and device for flexibly spreading metal powder for selective laser melting additive manufacturing |
| CN104827033A (en) * | 2015-04-15 | 2015-08-12 | 南京航空航天大学 | Apparatus and method for on-line laser melting deposition melt enhancement by electromagnetic impulsion |
| CN105522153A (en) * | 2016-02-05 | 2016-04-27 | 东南大学 | Laser material increase manufacturing device assisted by electromagnetic field |
-
2017
- 2017-01-09 CN CN201710014254.2A patent/CN106670462B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03107404A (en) * | 1989-09-22 | 1991-05-07 | Daido Steel Co Ltd | Method and apparatus for manufacturing metal powder |
| CN101856724A (en) * | 2010-06-13 | 2010-10-13 | 华南理工大学 | Selective laser melting forming device and method of medical magnesium alloy metal part |
| CN104325140A (en) * | 2014-11-18 | 2015-02-04 | 韶关学院 | Method and device for flexibly spreading metal powder for selective laser melting additive manufacturing |
| CN104827033A (en) * | 2015-04-15 | 2015-08-12 | 南京航空航天大学 | Apparatus and method for on-line laser melting deposition melt enhancement by electromagnetic impulsion |
| CN105522153A (en) * | 2016-02-05 | 2016-04-27 | 东南大学 | Laser material increase manufacturing device assisted by electromagnetic field |
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