CN116275116B - Method for synchronously scanning double laser and double vibrating mirrors for powder bed additive manufacturing - Google Patents
Method for synchronously scanning double laser and double vibrating mirrors for powder bed additive manufacturing Download PDFInfo
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- CN116275116B CN116275116B CN202310151220.3A CN202310151220A CN116275116B CN 116275116 B CN116275116 B CN 116275116B CN 202310151220 A CN202310151220 A CN 202310151220A CN 116275116 B CN116275116 B CN 116275116B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000000654 additive Substances 0.000 title claims abstract description 13
- 230000000996 additive effect Effects 0.000 title claims abstract description 13
- 239000000843 powder Substances 0.000 title claims abstract description 12
- 230000001360 synchronised effect Effects 0.000 claims abstract description 11
- 230000009977 dual effect Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 9
- 230000009191 jumping Effects 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 4
- 230000004927 fusion Effects 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000006467 substitution reaction 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
- B22F10/30—Process control
- B22F10/36—Process control of energy beam parameters
- B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
-
- 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
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/80—Data acquisition or data processing
- B22F10/85—Data acquisition or data processing for controlling or regulating additive manufacturing processes
-
- 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
- B33Y50/00—Data acquisition or data processing for additive manufacturing
- B33Y50/02—Data acquisition or data processing for additive manufacturing for controlling or regulating additive manufacturing processes
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Automation & Control Theory (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Laser Beam Processing (AREA)
- Laser Beam Printer (AREA)
Abstract
The invention discloses a method for synchronously scanning double laser and double vibrating mirrors, which is applied to powder bed additive manufacturing; the dual-laser scanning device mainly comprises a dual-laser same-point scanning mode, a dual-laser parallel scanning mode and a dual-laser following scanning mode. And when synchronous scanning is carried out, the current contour information is read, the generated path planning file is imported into different control cards, and a proper forming method is selected according to the printing requirement to finish sample forming. The invention greatly expands the application range of the multi-laser multi-vibrating mirror, improves the efficiency, simultaneously can avoid the influence of residual stress caused by regional scanning, and ensures the consistency of sample quality.
Description
Technical Field
The invention relates to the field of metal additive manufacturing, in particular to a method for synchronously scanning double laser and double vibrating mirrors for powder bed additive manufacturing.
Background
Compared with the traditional manufacturing, the additive manufacturing has the advantages of no need of props and dies, short development period, capability of forming complex parts and the like, and particularly has the advantages of high precision of manufactured parts Chen Xianggong and excellent mechanical properties in the powder bed additive manufacturing technology, and rapid development is achieved in recent years. The powders manufactured by iron-based alloys, titanium alloys, aluminum alloys, nickel-based alloys, cobalt-based alloys and the like are mainly studied and used at present.
Along with the continuous progress of technology, the additive manufacturing of the powder bed gradually develops to the direction of large size and high efficiency, the forming area is continuously expanded by increasing the number of lasers and vibrating mirrors, and the efficiency is improved by dividing a sample into different areas through a partition method and respectively forming by using a plurality of lasers. However, this also creates a number of problems, such as the fact that different lasers are formed separately, and the performance of different areas of the same part may not be uniform; for example, the boundary of the subarea is scanned by two laser beams, the boundary is not reasonable, the boundary is raised or recessed easily, the residual stress is increased, and the like. Thereby reducing the quality of the parts and having a certain risk in the use process.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provide a method for synchronously scanning double laser and double vibrating mirrors for powder bed additive manufacturing.
The invention mainly adopts a double-laser same-point scanning mode, a double-laser parallel scanning mode and a double-laser following scanning mode. And when synchronous scanning is carried out, the current contour information is read, the generated path planning file is imported into different control cards, and a proper forming method is selected according to the printing requirement to finish sample forming. The invention greatly expands the application range of the multi-laser multi-vibrating mirror, improves the efficiency, simultaneously can avoid the influence of residual stress caused by regional scanning, and ensures the consistency of sample quality.
The invention is realized by the following technical scheme:
a method for dual laser dual galvanometer synchronous scanning for powder bed additive manufacturing, comprising the steps of:
s1: reading the current layer expansion information, and forming a path planning file according to the selected scanning algorithm
S2: the file is imported into different galvanometer control cards;
s3: judging, if the synchronous scanning mode is adopted, respectively jumping the double laser beams to the printing starting points; otherwise, carrying out partition scanning, and jumping to S5;
s4: when judging, if the same-point scanning mode is adopted, jumping to S5; if the scanning mode is the parallel scanning mode, setting an offset distance; if the scanning mode is followed, a following time difference or a distance difference is set.
S5: printing is started.
In step S4, the co-point scanning mode includes the following sub-steps:
s4-1: importing the path planning file into a galvanometer control card;
s4-2: the double light beams jump to the starting point of the printing scanning line;
s4-3: if the starting point positions are the same, printing is started, otherwise waiting is carried out;
s4-4: when one scanning line is finished, if the distance between the starting point of the next scanning line and the end point of the scanning line is equal to the scanning interval length, printing is directly carried out, otherwise, the step S3-2 and the step S3-3 are executed;
s4-5: and (4) circulating the step S4-4 until the printing is finished.
In step S4, the parallel scanning mode includes the following sub-steps:
s4-11: importing the path planning file into a galvanometer control card;
s4-22: reading parallel interval parameters perpendicular to the scanning direction set by software, judging whether the parameters meet the requirements, and prompting a user to modify data if the parameters do not meet the requirements;
s4-33: the double light beams jump to the starting point of the printing scanning line;
s4-44: if the starting point position meets the parallel offset distance, printing is started, otherwise waiting is carried out;
s4-55: when one scanning line is finished, if the distance between the starting point of the next scanning line and the end point of the scanning line is equal to the scanning interval length, printing is directly carried out, otherwise, the steps S4-33 and S4-44 are executed;
s4-66: and (4) circulating the steps S4-55 until the printing is finished.
In step S4, the following scan mode includes the following sub-steps:
s4-111: importing the path planning file into a galvanometer control card;
s4-222: reading following interval parameters in the scanning direction set by the software, judging whether the following interval parameters meet the requirements, and prompting a user to modify data if the following interval parameters do not meet the requirements;
s4-333: the double light beams jump to the starting point of the printing scanning line;
s4-444: if the starting point position meets the following offset distance, printing is started, otherwise waiting is carried out;
s4-555: when one scanning line is finished, if the distance between the starting point of the next scanning line and the end point of the scanning line is equal to the scanning interval length, printing is directly carried out, otherwise, the steps S4-333 and S4-444 are executed;
s4-666: and (4) circulating the steps S4-555 until the printing is finished.
The wavelengths of the dual lasers are the same or different.
In step S2, under the synchronous scanning mode, the same path planning file is imported into different galvanometer control cards.
In step S3, when the dual laser jumps to the printing start point, position detection is required, and if the start positions of the dual laser jump to the printing start point are different, waiting is required until the two start positions are the same.
In step S4, if the same-point scanning mode is adopted, the laser power should be reduced or the scanning speed should be increased when the wavelengths of the lasers are the same, so as to achieve the same energy input as the original single laser; if the wavelengths of the lasers are different, a composite light spot can be formed.
In step S4, when the laser jumps, if the distance of the next position to jump is a scanning interval, the position detection is not needed; otherwise, the position detection is needed again to ensure that the positions of the printing starting points are the same and prevent the asynchronous caused by different jump distances of the vibrating mirrors.
In step S4, the parallel scanning mode is to preset an offset distance (the offset distance is the smallest about half of the diameter of the laser spot and the largest about the distance of the diameter of the laser spot) perpendicular to the scanning direction, that is, the offset distance is not less than half of the diameter of the laser spot and not more than the diameter of the laser spot, otherwise, the fusion channel discontinuity occurs.
Compared with the prior art, the invention has the following advantages and effects:
the invention increases the synchronous scanning algorithm and expands the application range of the double-laser double-vibrating mirror.
The invention adopts the same-point scanning to expand the process parameters, so that the process window is increased; lasers of different wavelengths may be coupled.
The invention adopts parallel scanning to greatly improve the scanning efficiency and ensure the consistency of the performance of large parts.
The invention adopts follow-up scanning to achieve the purposes of preheating before and preserving heat after, and improves the forming quality of parts.
Drawings
FIG. 1 is a schematic diagram of the operation flow of the present invention.
FIG. 2 is a schematic diagram of a synchronous scanning classification block according to the present invention.
In the figure: 1 is a vibrating mirror I; 2 is a laser beam in the co-point scanning mode; 3 is a laser beam in the follow scan mode; 4 is a laser beam in the parallel scanning mode; 5 is a forming plane; 6 is a vibrating mirror II; 7 is a laser beam in the parallel scanning mode; 8 is a laser beam in the follow scan mode, and 9 is a laser beam in the co-point scan mode.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples
As shown in fig. 1-2. The invention discloses a method for synchronously scanning double laser and double vibrating mirrors, which is applied to powder bed additive manufacturing, and comprises the following steps:
a method for synchronously scanning double laser and double vibrating mirrors applied to powder bed additive manufacturing comprises the following steps:
s1: reading the current layer expansion information, and forming a path planning file according to the selected scanning algorithm
S2: the file is imported into different galvanometer control cards;
s3: judging, if the synchronous scanning mode is adopted, respectively jumping the double laser beams to the printing starting points; otherwise, carrying out partition scanning, and jumping to S5;
s4: when judging, if the same-point scanning mode is adopted, jumping to S5; if the scanning mode is the parallel scanning mode, setting an offset distance; if the scanning mode is followed, a following time difference or a distance difference is set.
S5: printing is started.
In step S4, the co-point scanning mode includes the following sub-steps:
s4-1: importing the path planning file into a galvanometer control card;
s4-2: the double light beams jump to the starting point of the printing scanning line;
s4-3: if the starting point positions are the same, printing is started, otherwise waiting is carried out;
s4-4: when one scanning line is finished, if the distance between the starting point of the next scanning line and the end point of the scanning line is equal to the scanning interval length, printing is directly carried out, otherwise, the step S3-2 and the step S3-3 are executed;
s4-5: and (4) circulating the step S4-4 until the printing is finished.
In step S4, the parallel scanning mode includes the following sub-steps:
s4-11: importing the path planning file into a galvanometer control card;
s4-22: reading parallel interval parameters perpendicular to the scanning direction set by software, judging whether the parameters meet the requirements, and prompting a user to modify data if the parameters do not meet the requirements;
s4-33: the double light beams jump to the starting point of the printing scanning line;
s4-44: if the starting point position meets the parallel offset distance, printing is started, otherwise waiting is carried out;
s4-55: when one scanning line is finished, if the distance between the starting point of the next scanning line and the end point of the scanning line is equal to the scanning interval length, printing is directly carried out, otherwise, the steps S4-33 and S4-44 are executed;
s4-66: and (4) circulating the steps S4-55 until the printing is finished.
In step S4, the following scan mode includes the following sub-steps:
s4-111: importing the path planning file into a galvanometer control card;
s4-222: reading following interval parameters in the scanning direction set by the software, judging whether the following interval parameters meet the requirements, and prompting a user to modify data if the following interval parameters do not meet the requirements;
s4-333: the double light beams jump to the starting point of the printing scanning line;
s4-444: if the starting point position meets the following offset distance, printing is started, otherwise waiting is carried out;
s4-555: when one scanning line is finished, if the distance between the starting point of the next scanning line and the end point of the scanning line is equal to the scanning interval length, printing is directly carried out, otherwise, the steps S4-333 and S4-444 are executed;
s4-666: and (4) circulating the steps S4-555 until the printing is finished.
The wavelengths of the dual lasers are the same or different.
In step S2, under the synchronous scanning mode, the same path planning file is imported into different galvanometer control cards.
In step S3, when the dual laser jumps to the printing start point, position detection is required, and if the start positions of the dual laser jump to the printing start point are different, waiting is required until the two start positions are the same. The waiting time is generally not more than 0.1s.
In step S4, if the same-point scanning mode is adopted, the laser power should be reduced or the scanning speed should be increased when the wavelengths of the lasers are the same, so as to achieve the same energy input as the original single laser; if the wavelengths of the lasers are different, a composite light spot can be formed. The composite light spot can be used for in-situ heat preservation, preheating, remelting and the like, and can also be used for processing materials with high infrared laser reflectivity.
In step S4, when the laser jumps, if the distance of the next position to jump is a scanning interval, the position detection is not needed; otherwise, the position detection is needed again to ensure that the positions of the printing starting points are the same and prevent the asynchronous caused by different jump distances of the vibrating mirrors.
In step S4, the parallel scanning mode is to preset an offset distance (the offset distance is the smallest about half of the diameter of the laser spot and the largest about the distance of the diameter of the laser spot) perpendicular to the scanning direction, that is, the offset distance is not less than half of the diameter of the laser spot and not more than the diameter of the laser spot, otherwise, the fusion channel discontinuity occurs. By adjusting the parallel scanning interval, the efficiency of the partition scanning can be achieved or even exceeded, and the problems that residual stress and the like occur in the lap joint area of the partition scanning are solved.
The following scanning mode is that two lasers have a certain offset distance in the scanning direction, and the two lasers can be guaranteed to be in a front-back state through setting time difference, and the front-back state can also be guaranteed through distance difference. The time difference and the distance difference may be positive or negative, and represent the relative positions of the different lasers.
As described above, the present invention can be preferably realized.
The embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the invention should be made and equivalents should be construed as falling within the scope of the invention.
Claims (1)
1. The method for synchronously scanning the double laser and the double vibrating mirror for the additive manufacturing of the powder bed is characterized by comprising the following steps of:
s1: reading current layer expansion information, and forming a path planning file according to the selected scanning algorithm;
s2: importing the path planning file into different galvanometer control cards;
s3: judging, if the synchronous scanning mode is adopted, respectively jumping the double laser beams to the printing starting points; otherwise, carrying out partition scanning, and jumping to S5;
s4: when judging, if the same-point scanning mode is adopted, jumping to S5; if the scanning mode is the parallel scanning mode, setting an offset distance; if the scanning mode is the following scanning mode, setting a following time difference or a distance difference;
s5: printing is started;
in step S4, the co-point scanning mode includes the following sub-steps:
s4-1: importing the path planning file into a galvanometer control card;
s4-2: the double light beams jump to the starting point of the printing scanning line;
s4-3: if the starting point positions are the same, printing is started, otherwise waiting is carried out;
s4-4: when one scanning line is finished, if the distance between the starting point of the next scanning line and the end point of the scanning line is equal to the scanning interval length, printing is directly carried out, otherwise, the step S4-2 and the step S4-3 are executed;
s4-5: step S4-4 is circulated until printing is finished;
in step S4, the parallel scanning mode includes the following sub-steps:
s4-11: importing the path planning file into a galvanometer control card;
s4-22: reading parallel interval parameters perpendicular to the scanning direction set by software, judging whether the parameters meet the requirements, and prompting a user to modify data if the parameters do not meet the requirements;
s4-33: the double light beams jump to the starting point of the printing scanning line;
s4-44: if the starting point position meets the parallel offset distance, printing is started, otherwise waiting is carried out;
s4-55: when one scanning line is finished, if the distance between the starting point of the next scanning line and the end point of the scanning line is equal to the scanning interval length, printing is directly carried out, otherwise, the steps S4-33 and S4-44 are executed;
s4-66: step S4-55 is circulated until printing is finished;
in step S4, the following scan mode includes the following sub-steps:
s4-111: importing the path planning file into a galvanometer control card;
s4-222: reading following interval parameters in the scanning direction set by the software, judging whether the following interval parameters meet the requirements, and prompting a user to modify data if the following interval parameters do not meet the requirements;
s4-333: the double light beams jump to the starting point of the printing scanning line;
s4-444: if the starting point position meets the following offset distance, printing is started, otherwise waiting is carried out;
s4-555: when one scanning line is finished, if the distance between the starting point of the next scanning line and the end point of the scanning line is equal to the scanning interval length, printing is directly carried out, otherwise, the steps S4-333 and S4-444 are executed;
s4-666: step S4-555 is circulated until printing is finished;
the wavelength of the dual lasers is the same or different;
in step S2, under the synchronous scanning mode, the same path planning file is imported into different galvanometer control cards;
in step S3, when the dual laser jumps to the printing start point, position detection is required, and if the start positions of the dual laser and the printing start point are different, waiting is required until the positions of the dual laser and the printing start point are the same;
in step S4, if the same-point scanning mode is adopted, the laser power should be reduced or the scanning speed should be increased when the wavelengths of the lasers are the same, so as to achieve the same energy input as the original single laser; forming a composite light spot if the wavelengths of the lasers are different;
in step S4, when the laser jumps, if the distance of the next position to jump is a scanning interval, the position detection is not needed; otherwise, the position detection is needed again to ensure that the positions of the printing starting points are the same and prevent the vibration mirror jump distances from being different so as to cause the asynchronization;
in step S4, the parallel scanning mode is to preset an offset distance perpendicular to the scanning direction, that is, the offset distance is not less than half the diameter of the laser spot and not greater than the diameter of the laser spot, otherwise, the fusion channel discontinuity occurs.
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| CN202310151220.3A CN116275116B (en) | 2023-02-22 | 2023-02-22 | Method for synchronously scanning double laser and double vibrating mirrors for powder bed additive manufacturing |
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| CN116275116B true CN116275116B (en) | 2024-04-05 |
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| CN102662236A (en) * | 2012-05-29 | 2012-09-12 | 东南大学 | Scanning device realizing unidirectional laser scanning through double-faced vibrating mirror |
| CN104785921A (en) * | 2014-01-16 | 2015-07-22 | 大族激光科技产业集团股份有限公司 | Laser reflector path transmission system and machining equipment |
| EP3382421A1 (en) * | 2017-03-28 | 2018-10-03 | Photoneo S.R.O | Methods and apparatus for superpixel modulation with ambient light suppression |
| WO2022072305A1 (en) * | 2020-10-02 | 2022-04-07 | 3D Systems, Inc. | Three-dimensional print engine with large area build plane having optimized gas flow director structures |
| CN114379081A (en) * | 2021-12-16 | 2022-04-22 | 华南理工大学 | Double-laser double-vibrating-mirror same-breadth calibration platform and calibration method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230022029A1 (en) * | 2021-07-21 | 2023-01-26 | Layerwise Nv | Three-Dimensional Printing System with Enhanced Flat Field Correction Unit |
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- 2023-02-22 CN CN202310151220.3A patent/CN116275116B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102662236A (en) * | 2012-05-29 | 2012-09-12 | 东南大学 | Scanning device realizing unidirectional laser scanning through double-faced vibrating mirror |
| CN104785921A (en) * | 2014-01-16 | 2015-07-22 | 大族激光科技产业集团股份有限公司 | Laser reflector path transmission system and machining equipment |
| EP3382421A1 (en) * | 2017-03-28 | 2018-10-03 | Photoneo S.R.O | Methods and apparatus for superpixel modulation with ambient light suppression |
| WO2022072305A1 (en) * | 2020-10-02 | 2022-04-07 | 3D Systems, Inc. | Three-dimensional print engine with large area build plane having optimized gas flow director structures |
| CN114379081A (en) * | 2021-12-16 | 2022-04-22 | 华南理工大学 | Double-laser double-vibrating-mirror same-breadth calibration platform and calibration method thereof |
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