CN110733176A - Light beam shaping mechanism, laser light source system, laser 3D printing equipment and method - Google Patents
Light beam shaping mechanism, laser light source system, laser 3D printing equipment and method Download PDFInfo
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- CN110733176A CN110733176A CN201810806554.9A CN201810806554A CN110733176A CN 110733176 A CN110733176 A CN 110733176A CN 201810806554 A CN201810806554 A CN 201810806554A CN 110733176 A CN110733176 A CN 110733176A
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- 238000007493 shaping process Methods 0.000 title claims abstract description 56
- 230000007246 mechanism Effects 0.000 title claims abstract description 41
- 238000010146 3D printing Methods 0.000 title claims description 42
- 238000000034 method Methods 0.000 title claims description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000007639 printing Methods 0.000 claims description 21
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
- B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/20—Apparatus for additive manufacturing; Details thereof or accessories therefor
- B29C64/264—Arrangements for irradiation
- B29C64/268—Arrangements for irradiation using laser beams; using electron beams [EB]
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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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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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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- Optics & Photonics (AREA)
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- Mechanical Engineering (AREA)
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Abstract
The embodiment of the invention relates to beam shaping mechanisms, which are used for laser processing equipment and comprise a rotating wheel and or more beam shapers which are arranged on the rotating wheel and used for shaping laser beams emitted by a laser, wherein the rotating wheel is provided with a plurality of holes along the circumferential direction, the center line of each hole is parallel to the central axis of the rotating wheel, the distance between the center line of each hole and the central axis of the rotating wheel is equal, the beam shapers are arranged at the holes, and the optical axes of the beam shapers are coincident with the center line of the hole where the beam shapers are arranged.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to light beam shaping mechanisms, a laser light source system, laser 3D printing equipment and a laser 3D printing method.
Background
Laser beam that laser source sent is the gaussian beam, needs carry out the beam shaping to it according to actual conditions, and at present, the most mode list of laser beam that all kinds of equipment that utilize laser source including laser processing equipment provided can not be fit for the actual demand when processing, and the problem is more outstanding in the additive manufacturing field especially.
Additive manufacturing, commonly known as 3D printing, combines computer-aided design, material processing and forming technologies, and a manufacturing technology for manufacturing solid objects by stacking dedicated metal materials, non-metal materials and medical biomaterials layer by layer in manners of extrusion, sintering, melting, photocuring, injection and the like through software and a numerical control system on the basis of a digital model file.
The Laser 3D printing technology comprises a Selective Laser Melting (SLM) technology and a Selective Laser Sintering (SLS) technology, and is a main additive manufacturing method taking metal materials and certain non-metal materials as raw materials.
Relevant researches at home and abroad show that printed parts based on a laser 3D printing technology generally have quality problems of unmelted quality, high porosity, cracks and the like, in order to overcome the technical problems, related researches in the field mostly adopt a means of optimizing printing process parameters to improve the performance of the parts, such as optimizing parameters of laser power, scanning rate, pulse width, pulse frequency, lap joint rate, scanning strategy, powder preheating, powder spreading thickness and the like, and the optimized printing process parameters can improve the quality of the printed parts, but the technical problems are not really solved, and the performance of the printed parts is still not satisfactory.
Disclosure of Invention
The invention aims to solve the technical problems of unmelted quality, high porosity, cracking quality and the like of the laser beam mode list provided by various devices utilizing the laser light source and the printing parts based on the laser 3D printing technology.
The inventor firstly discovers in research that the energy distribution of a laser beam has a great relation with the forming quality of a part in a laser 3D printing technology. In the existing laser 3D printing equipment, the energy of a laser light source is in Gaussian distribution, the central energy of a laser light spot is high, the energy of the edge of the laser light spot is gradually low, and the characteristic of the energy distribution is an important reason for quality problems of unfused parts, high porosity, cracks and the like. The energy density of the center of the light spot is too large, a large temperature gradient is formed between the light spot and a heat affected zone, and the solidification of a molten pool and the heat affected zone generate large internal stress, so that the deformation or the cracking of parts are easily caused; the marginal energy of the light spot is low, so that the powder material is incompletely melted, and the defects of unmelted air holes and the like are caused.
Based on the above findings, the present invention provides kinds of beam shaping mechanisms, where the beam shaping mechanisms are used in a laser processing apparatus, and include a rotating wheel and or more beam shapers disposed on the rotating wheel for shaping laser beams emitted by a laser, a plurality of holes are disposed on the rotating wheel along a circumferential direction, a center line of each hole is parallel to a central axis of the rotating wheel, a distance between a center line of each hole and the central axis of the rotating wheel is equal, and the beam shapers are disposed at the holes, and an optical axis of each beam shaper coincides with a center line of a hole where the beam shaper is disposed.
And , the beam shaper comprises one or more of a flat-top spot pattern shaper, a concave spot pattern shaper, a rectangular spot pattern shaper, a square spot pattern shaper, an annular spot pattern shaper, an out-of-focus spot pattern shaper, and a focused spot pattern shaper .
And , the flat-top light spot mode shaper, the concave light spot mode shaper and the rectangular light spot mode shaper are refraction-diffraction mixed optical systems.
And , the defocused spot mode shaper is a refractive optical system or a refraction-diffraction mixed optical system.
And , the focused spot mode shaper is a beam expander optical system.
At step , at least of the plurality of holes are left empty or provided with lenses having no beam shaping function.
The embodiment of the invention also provides laser light source systems, which are used for laser processing equipment, each laser light source system comprises a laser and the beam shaping mechanism, the rotating wheel can rotate around the central shaft of the rotating wheel, the distance between the central shaft of the rotating wheel and the optical axis is equal to the distance between the central shaft of the rotating wheel and the central line of each hole, and the laser beams emitted by the lasers are emitted after passing through the beam shaping mechanism.
The embodiment of the invention also provides laser 3D printing devices, each laser 3D printing device comprises a laser, a collimation system and the beam shaping mechanism, the laser, the collimation system and the beam shaping mechanism are arranged along the optical axis direction, the rotating wheel can rotate around the central shaft of the rotating wheel, the collimation system collimates the laser beam emitted by the laser, and the collimated light emitted by the collimation system is emitted after passing through the beam shaping mechanism.
And , the laser 3D printing device comprises a laser arranged along the optical axis direction, a collimation system, the beam shaping mechanism, the scanning galvanometer and the field lens.
The embodiment of the invention also provides laser 3D printing methods, which utilize the laser 3D printing equipment, and the method comprises the following steps:
s1: dividing a region to be printed into different printing regions;
s2: and selecting a proper light spot mode to scan the different printing areas according to the specific conditions of the different printing areas, wherein the selection of the light spot mode is realized by rotating the light beam shaping mechanism.
The embodiment of the invention has the following beneficial effects: according to the embodiment of the invention, the unique beam shaping mechanism is utilized, so that different light spot modes can be selected according to actual requirements in laser processing, the processing efficiency is improved, the functions of laser processing equipment are expanded, and the product quality is improved. Especially in laser 3D printing, realized utilizing the laser beam of different energy distributions as the heat source that laser 3D printed, can adjust laser facula energy and become flat-topped, sunken or other distributions, make the temperature in the laser scanning molten bath accord with actual need, obtained excellent technological effect: 1) the gasification of the material caused by overhigh energy of the Gaussian energy distribution center is avoided, and the damage to the material components is weakened; 2) the defects that the material is not completely melted due to too low Gaussian energy distribution edge energy, unfused and air holes in parts and the like are reduced are avoided; 3) the heat affected zone of the shaped light beam scanning melting channel is small, so that the influence of material adhesion on the dimensional accuracy of the printed part is weakened; 4) when the energy of the shaped light beam is uniform, the molten pool is flat, and the channel layer-layer lap joint of the part is flat and uniform in the 3D forming process, so that the high lap joint rate in the middle of scanning the channel by Gaussian energy distribution light spots and the insufficient lap joint rate on two sides are avoided, and the cracking caused by the over lap joint or the insufficient lap joint between the channel layer and the layer is reduced; 5) when the laser beam is shaped into a rectangular shaped beam, the lane-to-lane lap joint rate can be reduced, the forming efficiency is improved, and the nonuniformity of part tissues and mechanical properties caused by multiple lap joints can be reduced; 6) according to the actual situation, various light spot modes can be switched, and different light spot modes are utilized for scanning and heating.
Drawings
FIG. 1 is a schematic diagram of a beam shaping mechanism according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a laser 3D printing apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of dividing a region to be printed into different printing regions in a laser 3D printing method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the light intensity distribution of a laser beam after being shaped by a hybrid refraction-diffraction laser according to an embodiment of the present invention;
FIG. 5 is a distribution diagram of the light intensity profiles of a flat-top spot and an unshaped Gaussian spot obtained by shaping a laser beam according to an embodiment of the present invention.
Detailed Description
For purposes of making the objects, aspects and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following detailed description and drawings.
< Beam shaping mechanism >
Referring to fig. 1, an embodiment of the present invention provides beam shaping mechanisms 100, which can be used in a laser processing apparatus such as a laser 3D printing apparatus, and includes a disk-shaped rotating wheel 1 and or more beam shapers 2 for shaping laser beams emitted by lasers, a plurality of holes 3 are arranged on the rotating wheel 1 along a circumferential direction, a center line of each hole 3 is parallel to a central axis of the rotating wheel 1, a center line of each hole 3 is equidistant from the central axis of the rotating wheel 1, the beam shapers 2 include or more optical elements, the beam shapers 2 are arranged at the holes 3, an optical axis of each beam shaper 2 coincides with the center line of the hole 3 where the beam shaper is located, the beam shapers 2 are used for shaping laser beams emitted by lasers, and the number of the beam shapers 2 is less than or equal to the number of the holes 3.
In operation, the wheel 1 is able to rotate about the central axis of the wheel 1 and by rotating the wheel 1 the laser beam from the laser can pass through the beam shaper 2 at the aperture or through the empty aperture 3. in another embodiments, or more of the apertures 3 may be fitted with lenses that do not have beam shaping functionality.
The beam shaper 2 comprises or more of a flat-top light spot mode shaper, a sunken light spot (or M-shape light spot or inverse Gaussian light spot) mode shaper, a rectangular light spot mode shaper, a square light spot mode shaper, an annular light spot mode shaper, an out-of-focus light spot mode shaper and a focused light spot mode shaper.
When the beam shapers 2 are multiple, the beam shapers can be the same type of beam shapers or different types of beam shapers. Different laser spots can be obtained by using a plurality of spot pattern shapers, and when the laser beam passes through the vacant hole 3 or the lens without the beam shaping function arranged at the hole 3, a Gaussian spot pattern is obtained.
The flat-top light spot mode shaper, the concave light spot mode shaper, the rectangular light spot mode shaper, the square light spot mode shaper and the annular light spot mode shaper are all provided with a refraction-diffraction mixed optical system, for example.
The defocused spot mode shaper, for example, using a refractive or diffractive hybrid optical system, can provide defocus to the field lens output spot with additional add minimal power.
The focusing spot mode shaper can output larger beam size by adopting a beam expanding optical system, and finally obtains a smaller-size focusing spot.
The specific composition and structure of the beam shaper for achieving different spot modes is well known to those skilled in the art and need not be described in further detail.
When the beam shaping mechanism is used in laser processing equipment, a flat-top light spot mode and a sunken light spot (or called M-shape light spot and inverse Gaussian light spot) mode can be used for powder laying laser 3D printing and laser welding, a heat affected zone can be reduced, the phenomenon of evaporation back pressure caused by over concentration of energy in a central area is reduced and avoided, the problems of surface processing quality inspection and component segregation are avoided, and the production efficiency is improved; the annular light spot mode can be used for near-net-shape laser 3D printing of coaxial powder feeding, the energy utilization rate can be improved, the production efficiency is improved, and the energy in a central area is prevented from being too concentrated; the square light spot mode can be used for the condition that uniform square area processing is needed, such as non-metal surface welding and the like, the welding area can be heated uniformly, the welding quality is good, and the residual stress is small.
The beam shaping mechanism can be used in various laser processing devices, such as laser 3D printing, laser cutting, laser welding, laser polishing and the like, can conveniently adjust a required light spot mode according to the actual needs of processing, avoids the condition that a shaped laser beam obtained by a single beam shaper is not suitable for an actual workpiece, and improves the efficiency and the product quality of laser processing.
< laser 3D printing apparatus >
In the prior art, there are a plurality of laser 3D printing apparatuses, for example, a selective laser melting 3D printing apparatus and a selective laser sintering 3D printing apparatus, and the main components of the apparatuses are the same, and the apparatuses mainly include a laser, a scanning system, a field lens, a powder spreading device, an electrical control system, a computer system, and the like, and each component is as follows:
a laser for emitting a laser beam as a heat source;
the collimation system is used for collimating the laser beam emitted by the laser;
the scanning system is used for enabling the laser beam to scan the workpiece, namely, enabling the laser beam and the workpiece to generate relative motion, and changing the position of a laser spot on the workpiece; there are many different implementations of the scanning system other than the above, for example: the laser source is moved in the Z direction while the workpiece is moved in the direction X, Y; or the workpiece is not moved, and the laser light source and the outer light path system move in the direction of X, Y; or the laser light source and the workpiece are not moved, and the scanning galvanometer is arranged in the light path system to enable the laser beam to move on the workpiece in the direction of X, Y; or the laser light source and the light path system move in the X direction, and the workpiece moves in the Y direction; or the laser light source is not moved, and the scanning galvanometer is arranged in the optical path system, so that the laser beam can move X, Y on the workpiece, and the workpiece moves in the Z direction. The scanning mode can realize the scanning of the laser beam to the workpiece, and the processing and manufacturing of the three-dimensional part are completed.
The field lens is used for focusing the laser beam on the working surface;
the powder paving device is used for paving materials, such as metal materials and/or non-metal materials such as ceramics, nylon and the like in the forming process of the printed parts;
the electric control system is used for adjusting working parameters and working states of the equipment;
the computer system is used for system control.
Referring to fig. 2, on the basis of the above prior art, the embodiment of the present invention further discloses kinds of laser 3D printing apparatuses, which include a laser 10, a collimating system 20, a beam shaping mechanism 100, a scanning galvanometer 30, and a field lens 40, which are arranged along the optical axis direction, wherein a laser beam emitted by the laser 10 is shaped by the collimating system 20, and then emits collimated light, which enters the scanning galvanometer after passing through the beam shaping mechanism 100, and is then focused by the field lens 40, and the emitted focused laser beam scans a workpiece 60 on a worktable 50, i.e., laser 3D printing can be achieved.
Thus, embodiments of the present invention can achieve switching of the spot mode by integrating or more beam shapers on wheels, and rotating the wheels to pass the beam through a device on the wheel or a lens without beam shaping function mounted at the vacant aperture or aperture 3 on the wheel according to actual needs.
It should be particularly noted that, although the scanning system of the laser 3D printing apparatus is a scanning galvanometer, the scanning galvanometer is not limited to the scanning galvanometer, and the beam shaping mechanism 100 of the embodiment of the present invention is suitable for a laser processing apparatus having a focusing system of any focusing mode or other scanning modes.
< laser light Source System >
The embodiment of the present invention further provides laser light source systems, where the laser light source systems are used in laser processing equipment, the laser light source systems include a laser and the beam shaping mechanism 100, the rotating wheel can rotate around a central axis of the rotating wheel, a distance between the central axis of the rotating wheel and an optical axis is equal to a distance between the central axis of the rotating wheel and a central axis of each hole, the laser is used to emit a laser beam, and the laser beam emitted by the laser is emitted after passing through the beam shaping mechanism.
It can be understood by those skilled in the art that, based on the disclosure of the present embodiment, in the field of laser processing equipment, the arrangement manner of the beam shaping mechanism 100 in the laser light source system can be flexibly set by those skilled in the art according to the specific characteristics and system requirements, for example, a laser beam emitted by a laser may be shaped by a beam shaping element and then incident to the beam shaping mechanism 100, or, as in the embodiment of the laser light source system described above by taking the laser 3D printing equipment as an example in the present embodiment, a laser beam emitted by a laser enters the beam shaping mechanism after passing through a collimating system. The laser light source system of the present invention is not limited to the specific embodiment of the present embodiment.
< laser 3D printing method >
In the prior art, there are a plurality of laser 3D printing methods, for example, a selective laser melting 3D printing method and a selective laser sintering 3D printing method, the difference mainly lies in that the used materials are different, and the printing methods are substantially the same, and the printing method includes the following steps:
(1) reading a 3D model file of a three-dimensional solid part to be processed, slicing in a layered mode, importing proper technological parameters, designing a laser scanning path, and generating a corresponding numerical control code;
(2) uniformly laying materials, such as metal materials and/or non-metal materials such as ceramics, nylon and the like, on the working table;
(3) the computer drives the movement mechanism to move according to the numerical control code generated in the step (1), selective laser melting is carried out on each layer of material, and the melted powder is solidified at to form a solid part of the part after being cooled;
(4) after layers of powder are solidified, the powder laying device lays layers of materials again, and the laser beam starts scanning of new layers;
(5) the system repeats this process until the stack builds up into a three-dimensional solid part.
Referring to fig. 3, on the basis of the above prior art, an embodiment of the present invention further provides methods for performing 3D printing by using the above laser 3D printing apparatus, which includes the following steps:
s1 dividing the region to be printed into different printing regions, for example, the region to be printed is divided into a th printing region O, a second printing region P, and a third printing region Q (Q is an edge region) as shown in FIG. 3.
S2: according to the specific situation of different printing areas, selecting a proper light spot mode to scan the different printing areas, wherein the selection of the light spot mode is realized by rotating the light beam shaping mechanism 100. For three different printing areas shown in fig. 3, the appropriate spot pattern is selected for scanning according to actual conditions.
For example, the th printing area O is heated by a laser spot in a flat-top spot mode or a concave spot mode, the third printing area Q is heated in a form of a hooked edge by a focused gaussian spot mode, and the material can be preheated in a defocusing mode to balance a temperature field and reduce internal stress generated by a temperature gradient.
Referring to fig. 4, according to a specific implementation manner of the laser beam shaping according to the embodiment of the present invention, an incident gaussian beam passes through a diffractive optical element 4, a wavefront phase is modulated, and then passes through a field lens 5, and a light intensity distribution of a focused light spot changes to become a flat-top light spot, in fig. 4, G is a gaussian light spot, and F is a shaped flat-top light spot.
Referring to fig. 5, the laser beam has a flat-top spot light intensity profile (a) obtained by shaping and a gaussian spot light intensity profile (B) obtained without shaping.
The embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
- The beam shaping mechanism is used for laser processing equipment and is characterized by comprising a rotating wheel and or more beam shapers which are arranged on the rotating wheel and used for shaping laser beams emitted by a laser, wherein a plurality of holes are formed in the rotating wheel in the circumferential direction, the center line of each hole is parallel to the central axis of the rotating wheel, the distance between the center line of each hole and the central axis of the rotating wheel is equal, the beam shapers are arranged at the holes, and the optical axes of the beam shapers are coincident with the center line of the hole where the beam shapers are arranged.
- 2. The beam shaping mechanism of claim 1 wherein the beam shaper comprises or more of a flat-top spot pattern shaper, a concave spot pattern shaper, a rectangular spot pattern shaper, a square spot pattern shaper, an annular spot pattern shaper, an out-of-focus spot pattern shaper, and a focused spot pattern shaper.
- 3. The beam shaping mechanism of claim 2 wherein the flat-topped spot pattern shaper, the depressed spot pattern shaper, and the rectangular spot pattern shaper are diffractive-refractive hybrid optical systems.
- 4. The beam shaping mechanism of claim 2 wherein the out-of-focus spot mode shaper is a refractive optical system or a diffractive-refractive hybrid optical system.
- 5. The beam shaping mechanism of claim 2 wherein the focused spot mode shaper is beam expanding optics.
- 6. The beam-shaping mechanism of claim 1 wherein at least of the plurality of apertures are empty or provided with lenses that do not have beam-shaping functionality.
- 7, laser light source system, which is used in laser processing equipment, characterized in that, the laser light source system includes a laser and the beam shaping mechanism of of claims 1-6, the rotating wheel can rotate around the central axis of the rotating wheel, the distance between the central axis of the rotating wheel and the optical axis is equal to the distance between the central axis of the rotating wheel and the central line of each hole, the laser beam emitted by the laser is emitted after passing through the beam shaping mechanism.
- 8, laser 3D printing equipment, characterized in that, the laser 3D printing equipment includes the laser that sets up along the optical axis direction, collimation system and the beam shaping mechanism of of claims 1-6, the runner can rotate around the center pin of runner, collimation system collimates the laser beam of laser emission, collimated light that the collimation system goes out after the beam shaping mechanism.
- 9. The laser 3D printing device according to claim 8, wherein the laser 3D printing device comprises a laser arranged in the direction of the optical axis, a collimating system, a beam shaping mechanism according to of claims 1-6, a scanning galvanometer, and a field lens.
- 10, method for laser 3D printing, characterized in that, with a laser 3D printing device according to claim 8 or 9, the method comprises the following steps:s1: dividing a region to be printed into different printing regions;s2: and selecting a proper light spot mode to scan the different printing areas according to the specific conditions of the different printing areas, wherein the selection of the light spot mode is realized by rotating the light beam shaping mechanism.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810806554.9A CN110733176A (en) | 2018-07-20 | 2018-07-20 | Light beam shaping mechanism, laser light source system, laser 3D printing equipment and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810806554.9A CN110733176A (en) | 2018-07-20 | 2018-07-20 | Light beam shaping mechanism, laser light source system, laser 3D printing equipment and method |
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| CN110733176A true CN110733176A (en) | 2020-01-31 |
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| CN109353004A (en) * | 2018-09-26 | 2019-02-19 | 杭州先临易加三维科技有限公司 | Spot shaping method, apparatus, computer equipment and storage medium |
| CN111781731A (en) * | 2020-08-12 | 2020-10-16 | 广西大学 | Double-light-path coupling shaping device for metal SLM printing |
| CN112775441A (en) * | 2020-12-25 | 2021-05-11 | 南京航空航天大学 | Light beam customization module and method and device for reducing selective laser melting pore defects |
| CN114226759A (en) * | 2021-11-30 | 2022-03-25 | 季华实验室 | Laser device for SLM metal 3D printing and printing method |
| CN114535610A (en) * | 2022-03-01 | 2022-05-27 | 燕山大学 | Efficient additive manufacturing method and system with double laser synchronous coupling |
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| CN111781731A (en) * | 2020-08-12 | 2020-10-16 | 广西大学 | Double-light-path coupling shaping device for metal SLM printing |
| CN112775441A (en) * | 2020-12-25 | 2021-05-11 | 南京航空航天大学 | Light beam customization module and method and device for reducing selective laser melting pore defects |
| CN114226759A (en) * | 2021-11-30 | 2022-03-25 | 季华实验室 | Laser device for SLM metal 3D printing and printing method |
| CN114535610A (en) * | 2022-03-01 | 2022-05-27 | 燕山大学 | Efficient additive manufacturing method and system with double laser synchronous coupling |
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