CN108500270A - Compound increasing material manufacturing method and compound increasing material manufacturing equipment - Google Patents
Compound increasing material manufacturing method and compound increasing material manufacturing equipment Download PDFInfo
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- CN108500270A CN108500270A CN201810462645.5A CN201810462645A CN108500270A CN 108500270 A CN108500270 A CN 108500270A CN 201810462645 A CN201810462645 A CN 201810462645A CN 108500270 A CN108500270 A CN 108500270A
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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
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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
- 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
- B22F12/10—Auxiliary heating means
- B22F12/13—Auxiliary heating means to preheat the material
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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]
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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
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
- B22F10/362—Process control of energy beam parameters for preheating
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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
- 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
- B22F12/40—Radiation means
- B22F12/44—Radiation means characterised by the configuration of the radiation means
- B22F12/45—Two or more
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- 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
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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
- 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
- B22F12/50—Means for feeding of material, e.g. heads
- B22F12/52—Hoppers
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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
- 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
- B22F12/50—Means for feeding of material, e.g. heads
- B22F12/55—Two or more means for feeding material
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- 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
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Abstract
The invention belongs to increases material manufacturing technology fields, disclose a kind of compound increasing material manufacturing method, include the following steps：Sintering is scanned to the powder bed laid by laser beam during powdering；Sintered powder bed is scanned by electron beam and is preheated；Fusing is scanned to the powder bed after being preheated in given cross-sectional by the laser beam and/or the electron beam.The present invention also provides a kind of compound increasing material manufacturing equipment using above-mentioned compound increasing material manufacturing method.The present invention passes through above-mentioned increasing material manufacturing method, powder bed is scanned by laser beam while powdering and is sintered, on the one hand by being sintered powder bed so that the electric conductivity of powder bed is increased, and then repellence of the powder bed to electron beam " blowing powder " is improved, it ensure that the success rate of increasing material manufacturing；On the other hand, powdering progress synchronous to powder bed scanning sintering with laser beam, greatly improves the efficiency of entire increasing material manufacturing.
Description
Technical field
The present invention relates to increases material manufacturing technology field more particularly to a kind of compound increasing material manufacturing method and compound increasing material manufacturings
Equipment.
Background technology
When carrying out powdering formula increasing material manufacturing, generally use electron beam or laser beam melt to carry out the heating of powder bed.
Wherein：
When being heated to powder bed by electron beam, powder bed is enabled to be increased to higher temperature, then carries out section again
Fusing.Since the powder bed tempertaure of electron beam heating is high, thermal stress when section is melted is low, it is not easy to buckling deformation.But pass through
The drip molding surface quality that electron beam increasing material manufacturing goes out is low, and the poor powder bed of electric conductivity is easy to burst under the action of electron beam
It dissipates (" blow powder " phenomenon), blows powder phenomenon and be difficult to avoid that, add somewhat to the probability of failure of increasing material manufacturing.
When being heated to powder bed by laser beam, since the hot spot of laser is small, forming accuracy is higher, enables to increasing material manufacturing
The drip molding surface quality gone out is high.But laser beam heats, there are powder bed tempertaure is low, thermal stress when section is melted is high, warpage
Big problem is inclined in deformation.When there is a degree of section loss rates deformation, the failure of increasing material manufacturing can be caused.
Invention content
The purpose of the present invention is to provide a kind of compound increasing material manufacturing method and compound increasing material manufacturing equipment, to solve because blowing
Caused by powder phenomenon or section loss rates deformation the problem of increasing material manufacturing failure.
For this purpose, the present invention uses following technical scheme：
A kind of compound increasing material manufacturing method, includes the following steps：
Sintering is scanned to the powder bed laid by laser beam during powdering；
Sintered powder bed is scanned by electron beam and is preheated；
Fusing is scanned to the powder bed after being preheated in given cross-sectional by the laser beam and/or the electron beam.
Preferably, the expansion rate in the region of the scanned sintering of the powder bed is not higher than the speed of powdering.
Preferably, the path of the laser beam flying sintering is straight line, and the direction of the straight line and powdering is perpendicular.
Preferably, region of the region of the scanned preheating of the powder bed no more than the scanned sintering of the powder bed.
Preferably, the region at the edge in the region of the scanned preheating of the powder bed and the scanned sintering of the powder bed
Edge interval pre-determined distance L.
Preferably, the powder bed scanning fusing to after being preheated in given cross-sectional includes：
By the laser beam at the profile of the given cross-sectional powder bed and the given cross-sectional in preheat after
Powder bed scanning fusing.
Preferably, the powder bed scanning fusing to after being preheated in given cross-sectional includes：
By the electron beam at the profile of the given cross-sectional powder bed and the given cross-sectional in preheat after
Powder bed scanning fusing.
Preferably, the powder bed scanning fusing to after being preheated in given cross-sectional includes：
Fusing is scanned to the powder bed at the profile of the given cross-sectional by the laser beam, and passes through the electron beam
Fusing is scanned to the powder bed after being preheated in the given cross-sectional.
Preferably, the compound increasing material manufacturing equipment is equipped with the glass window passed through for laser beam, and the glass
Radical occlusion device is equipped at window, the radical occlusion device can block the glass window.
The present invention also provides a kind of compound increasing material manufacturing equipment, carry out increasing material system using above-mentioned compound increasing material manufacturing method
It makes.
Preferably, the compound increasing material manufacturing equipment includes generating device of laser, what the generating device of laser generated
Laser beam can scan sintering during powdering to the powder bed laid.
Beneficial effects of the present invention：By above-mentioned increasing material manufacturing method, powder bed is swept by laser beam while powdering
Sintering is retouched, on the one hand by being sintered powder bed so that the electric conductivity of powder bed is increased, and then improves powder bed to electronics
The repellence of beam " blowing powder ", ensure that the success rate of increasing material manufacturing；On the other hand, powdering scans powder bed with laser beam and is sintered
It is synchronous to carry out, greatly improve the efficiency of entire increasing material manufacturing.
Description of the drawings
Fig. 1 is the flow chart of the compound increasing material manufacturing method of the present invention；
Fig. 2 is a kind of vertical view of motion state of Powder spreader of the present invention；
Fig. 3 is the structural schematic diagram of the compound increasing material manufacturing device of the present invention.
In figure：
1, working chamber；2, hopper；3, powdering platform；4, formation cylinder；5, piston；6, Powder spreader；7, electron beam generating apparatus；
8, generating device of laser；9, glass window.
Specific implementation mode
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
The present invention provides a kind of compound increasing material manufacturing method, as shown in Figure 1, the compound increasing material manufacturing method includes following step
Suddenly：
S10, powder bed scanning sintering during powdering by laser beam to having laid.
It is the laying that powder is realized by Powder spreader, to form powder bed in this step.Specifically, the Powder spreader is extremely
There are one the freedom of motion in direction for few tool.Fig. 2 is can refer to, moving (X-direction shown in figure) from left to right with Powder spreader is
Example, when Powder spreader powdering from left to right, on the left of region be the region for having laid powder bed, the region on right side is waits spreading
If the region of powder bed.When Powder spreader moves right, laser beam A is located at the left side of Powder spreader, and moves powdering in Powder spreader
While, laser beam can be scanned sintering to the powder bed laid.By laser beam to the powder bed that lays
Scanning sintering, enables to the electric conductivity of powder bed to be increased, and then improve resistance of the powder bed to electron beam " blowing powder "
Property, it ensure that the success rate of increasing material manufacturing.And this step to powder bed scanning by powdering and laser beam by being sintered same stepping
Row, without being individually scanned sintering, greatly improves the efficiency of entire increasing material manufacturing.
It is understood that the above-mentioned Powder spreader for working as this step can from left to right and both direction moves from right to left
When, laser beam is respectively positioned on the Powder spreader side opposite with powdering direction, and (if moved from left to right, laser beamer is then located at Powder spreader
Left side；It moves from right to left, laser beam is then located at the right side of Powder spreader).
In this step, the path of the scanning sintering of above-mentioned laser beam is straight line, and the straight line and the direction of powdering are mutually hung down
Directly.I.e. when Powder spreader moves from left to right, above-mentioned laser beam moves for front-rear direction shown in Fig. 2 (Y-direction in figure), leads to
The scanning sintering processing for crossing above-mentioned path can ensure that the powder bed laid is fully sintered.Further, above-mentioned laser
Beam is that shuttle-scanning scans sintering to realize to powder bed on its path, can accelerate the sintering of powder bed.It needs to refer to
Go out, have certain distance between the hot spot drop point and Powder spreader of the above-mentioned laser beam of the present embodiment, to prevent laser beam to paving
Powder device causes scaling loss.
In this step, the expansion rate in the region of the scanned sintering of above-mentioned powder bed is not higher than the speed of powdering, is equally
In order to avoid laser beam to Powder spreader to causing scaling loss.
S20, preheating is scanned to sintered powder bed by electron beam.
After step S10 laser beams are completed to the scanning for the powder bed being laid with, by electron beam to sintered powder
Layer is scanned preheating, i.e., by electron beam heating powder layer so that powder bed tempertaure is increased to required temperature, to the maximum extent
Reduce thermal stress..In this step, above-mentioned powder bed tempertaure is adjustable between 200 DEG C -1200 DEG C.
In this step, the region of the scanned preheating of powder bed should be not more than the region of the scanned sintering of powder bed, preferably
Electron beam to the scanning preheated zone of powder bed within the region of the scanned sintering of powder bed, in particular to powder bed is swept
Retouch the edge interval pre-determined distance L at the edge and the region of the scanned sintering of powder bed in the region of preheating.By above-mentioned setting, prevent
Only electron beam generates interference to the powder except the region of the scanned sintering of powder bed, causes the adverse effect of " blowing powder ".
S30, fusing is scanned to the powder bed after being preheated in given cross-sectional by laser beam and/or electron beam.
I.e. after step S20 is to powder bed scanning preheating, start the scanning fusing to powder bed.Specifically, in this step,
It is that fusing is scanned to the powder bed after being preheated in given cross-sectional by laser beam and/or electron beam, above-mentioned given cross-sectional refers to waiting for
The current cross-section of formed product can be programmed to realize the formation control to given cross-sectional.By being cut to default
Powder bed scanning fusing after being preheated in face, to form a section of product to be formed.
In this step, since there are both laser beam and electron beam energy sources, this step is to above-mentioned given cross-sectional
Following three kinds of modes may be used in powder bed scanning fusing after interior preheating：
1, the powder bed after being preheated in the powder bed and given cross-sectional at the profile of given cross-sectional is swept by laser beam
Retouch fusing.
Realize that the scanning to powder bed is melted using only laser beam, the scanning that electron beam is only used for powder bed is pre-
Heat.By this way, the generation of " blowing powder " phenomenon can be further reduced.
When scanning fusing, fusing first can be scanned to the powder bed at the profile of given cross-sectional by laser beam,
Fusing then is scanned to the powder bed after being preheated in given cross-sectional again.
2, the powder bed after being preheated in the powder bed and given cross-sectional at the profile of given cross-sectional is swept by electron beam
Retouch fusing.
Realize that the scanning to powder bed is melted using only electron beam, laser beam is only used for the burning of the scanning to powder bed
Knot, and during scanning sintering, not will produce metallic vapour so that the mating glass window of laser beam will not be by metal
Steam is deposited.In addition, it is scanned fusing using only electron beam, and when being scanned fusing, the mating windowpane with laser beam
Mouth can be blocked so that the pollution of glass window is reduced, and ensure that the transmitance for influencing laser beam.And remain windowpane
The high transmittance of mouth, can increase the stability of long-time increasing material manufacturing.
When scanning fusing, fusing first can be scanned to the powder bed at the profile of given cross-sectional by electron beam,
Fusing then is scanned to the powder bed after being preheated in given cross-sectional again.
3, fusing is scanned to the powder bed at the profile of given cross-sectional by laser beam, and by electron beam to given cross-sectional
Powder bed scanning fusing after interior preheating.
Fusing is scanned to the powder bed of the profile of given cross-sectional by laser beam, the hair of " blowing powder " phenomenon can be effectively prevent
It is raw, while electron beam being coordinated to scan fusing to the powder bed after being preheated in given cross-sectional, beam power is far above laser beam,
The fusing given cross-sectional required time is shorter, is effectively improved the efficiency of increasing material manufacturing..
The present invention also provides a kind of compound increasing material manufacturing equipment, carry out increasing material system using above-mentioned compound increasing material manufacturing method
It makes.Specifically, can refer to Fig. 3, above-mentioned compound increasing material manufacturing equipment include working chamber 1, hopper 2, powdering platform 3, formation cylinder 4,
Piston 5, Powder spreader 6, electron beam generating apparatus 7 and generating device of laser 8, wherein：
It is provided at least one hopper 2 in working chamber 1, two hoppers 2 are arranged in the present embodiment, in hopper 2
Equipped with dusty material, powdering platform 3 is equipped with below hopper 2, dusty material can be transported on powdering platform 3.In powdering
Platform 3 is equipped with formation cylinder 4, and the piston 5 that can be moved up and down is equipped in the formation cylinder 4.It is equipped with above powdering platform 3 removable
Powder spreader 6, the Powder spreader 6 at least with horizontal direction freedom of motion, can be by the dusty material on powdering platform 3
It scrapes to the piston 5 of formation cylinder 4, forms powder bed.In the present embodiment, above-mentioned Powder spreader 6 two-way can scrape powder, i.e., from left to right
Powder can be scraped, powder can also be scraped from right to left.Above-mentioned electron beam generating apparatus 7 and generating device of laser 8 are arranged at forming
The top of room 1, and the laser beam that sends out of generating device of laser 8 can be fallen in the side of the powdering of Powder spreader 6.
When carrying out the increasing material manufacturing of product to be formed, first, in a computer by the model storage of product to be formed, mould
Type is layered in a computer, and obtains each layer of machining information.The manufacture of product to be formed carries out in working chamber 1, material
Dusty material in bucket 2 is fallen on powdering platform 3, and powder is sprawled stratification by Powder spreader 6 above the piston 5 of formation cylinder 4, and
During 6 powdering of Powder spreader, generating device of laser 8 sends out laser beam, and laser beam is scanned the powder bed laid
Sintering.After the completion of 6 powdering of Powder spreader, powder bed also completes scanning sintering, then generates electricity by electron beam generating apparatus 7
Beamlet scans powder bed and preheats, and the region of the scanned preheating of powder bed is no more than the region of the scanned sintering of powder bed.It
The electron beam that the laser beam and/or electron beam generating apparatus 7 generated afterwards by generating device of laser 8 generates is to pre- in given cross-sectional
Powder bed after heat is melted, until this layer of powder bed is completely melt, forms a layer cross section of product to be formed；First layer is complete
After fusing, hopper 2 conveys dusty material on powdering platform 3 again, and Powder spreader 6 is above the piston 5 of formation cylinder 4 by powder
Straticulation is sprawled, and the laser beam sent out by generating device of laser 8 during powdering carries out the powder bed laid
Scanning sintering.Electron beam is generated by electron beam generating apparatus 7 to preheat powder bed, generated by generating device of laser 8 later
Laser beam and/or electron beam generating apparatus 7 generate electron beam in given cross-sectional preheat after powder bed melt, directly
It is completely melt to this layer of powder bed, the second layer cross section ... for forming product to be formed so recycles, by two layers of Continuous maching
Above powder bed is built into product to be formed.
Further, in the present embodiment, the lower end of generating device of laser 8 is provided with glass window 9, so that laser beam
Glass window 9 can be passed through, sintering and fusing are scanned to powder bed.Radical occlusion device (figure is equipped at above-mentioned glass window 9
In not depending on going out), which can block glass window 9, specifically when without using generating device of laser 8, by blocking
Device can block glass window 9, and glass window 9 can be effectively prevent to be polluted by metallic vapour.
Further, in the above-mentioned working chamber 1 of the present embodiment it is vacuum environment, vacuum degree 10-3Pa~10-1Pa.
Inert gas can be filled in working chamber 1, which can be helium, can also be argon gas, nitrogen etc. not with it is used
Raw material the inert gas that physically or chemically reacts occurs.
Obviously, the above embodiment of the present invention is just for the sake of clearly illustrating examples made by the present invention, and it is pair to be not
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement etc., should be included in the claims in the present invention made by within the spirit and principle of invention
Protection domain within.
Claims (11)
1. a kind of compound increasing material manufacturing method, which is characterized in that include the following steps：
Sintering is scanned to the powder bed laid by laser beam during powdering；
Sintered powder bed is scanned by electron beam and is preheated；
Fusing is scanned to the powder bed after being preheated in given cross-sectional by the laser beam and/or the electron beam.
2. compound increasing material manufacturing method according to claim 1, which is characterized in that the area of the scanned sintering of the powder bed
The expansion rate in domain is not higher than the speed of powdering.
3. compound increasing material manufacturing method according to claim 1, which is characterized in that the path of the laser beam flying sintering
For straight line, and the direction of the straight line and powdering is perpendicular.
4. compound increasing material manufacturing method according to claim 1, which is characterized in that the area of the scanned preheating of the powder bed
Region of the domain no more than the scanned sintering of the powder bed.
5. compound increasing material manufacturing method according to claim 4, which is characterized in that the area of the scanned preheating of the powder bed
The edge interval pre-determined distance L at the edge in domain and the region of the scanned sintering of the powder bed.
6. according to any compound increasing material manufacturing methods of claim 1-5, which is characterized in that described to pre- in given cross-sectional
Powder bed scanning after heat, which is melted, includes：
By the laser beam at the profile of the given cross-sectional powder bed and the given cross-sectional in preheat after powder
Last layer scanning fusing.
7. according to any compound increasing material manufacturing methods of claim 1-5, which is characterized in that described to pre- in given cross-sectional
Powder bed scanning after heat, which is melted, includes：
By the electron beam at the profile of the given cross-sectional powder bed and the given cross-sectional in preheat after powder
Last layer scanning fusing.
8. according to any compound increasing material manufacturing methods of claim 1-5, which is characterized in that described to pre- in given cross-sectional
Powder bed scanning after heat, which is melted, includes：
Fusing is scanned to the powder bed at the profile of the given cross-sectional by the laser beam, and by the electron beam to institute
State the powder bed scanning fusing after preheating in given cross-sectional.
9. a kind of compound increasing material manufacturing equipment, which is characterized in that using any compound increasing material manufacturing sides claim 1-8
Method carries out increasing material manufacturing.
10. compound increasing material manufacturing equipment according to claim 9, which is characterized in that the compound increasing material manufacturing equipment packet
Include generating device of laser, the powder that the laser beam that the generating device of laser generates can be during powdering to having laid
Layer scanning sintering.
11. compound increasing material manufacturing equipment according to claim 10, which is characterized in that in the compound increasing material manufacturing equipment
Equipped with the glass window passed through for laser beam, and radical occlusion device is equipped at the glass window, the radical occlusion device can block
The glass window.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110181048A (en) * | 2019-05-24 | 2019-08-30 | 清华大学 | A kind of electron beam increasing material manufacturing method of molybdenum-base alloy powder |
| CN110899700A (en) * | 2019-12-30 | 2020-03-24 | 西安赛隆金属材料有限责任公司 | Powder bed electron beam vibration material disk equipment |
| CN111266584A (en) * | 2020-04-14 | 2020-06-12 | 天津清研智束科技有限公司 | Additive manufacturing method |
| CN111570792A (en) * | 2020-06-16 | 2020-08-25 | 广州赛隆增材制造有限责任公司 | Method for inhibiting powder splashing of powder bed electron beam 3D printing |
| CN112024875A (en) * | 2020-08-18 | 2020-12-04 | 清华大学 | Powder bed synchronous heating melting additive manufacturing method |
| CN113649593A (en) * | 2021-08-12 | 2021-11-16 | 天津清研智束科技有限公司 | Additive manufacturing method for eliminating cracks |
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