CN113857492A - Self-disturbance laser additive manufacturing method - Google Patents
Self-disturbance laser additive manufacturing method Download PDFInfo
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- 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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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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- B22F10/85—Data acquisition or data processing for controlling or regulating additive manufacturing processes
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- 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
- B22F12/41—Radiation means characterised by the type, e.g. laser or electron beam
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- 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
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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
- 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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- 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
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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
- 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
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Abstract
A self-perturbing laser additive manufacturing method, the method comprising the steps of: acquiring structural characteristics of a formed part; acquiring thermophysical parameters of a forming material; constructing a self-disturbance laser additive manufacturing system; designing a self-disturbance parameter of a laser beam of the self-disturbance laser additive manufacturing system according to the structural feature and the thermophysical parameter; setting forming process parameters of the laser beam according to the structural characteristics and the thermophysical parameters; manufacturing the formed part according to the self-disturbance parameters and the forming process parameters. The stirring device converts the one-dimensional linear scanning of the laser beam in the prior art into the periodic two-dimensional pattern disturbance, realizes the stirring of the liquid molten pool under the condition of no additional physical field, has the functions of homogenizing microstructure, refining crystal grains, inhibiting element burning loss, reducing metallurgical defects such as cracks and air holes, increasing the size of the molten pool and shortening the processing time, and can greatly improve the forming efficiency while ensuring that parts have excellent comprehensive mechanical properties.
Description
Technical Field
The invention belongs to the technical field of laser additive manufacturing, and particularly relates to a self-disturbance laser additive manufacturing method.
Background
Selective Laser Melting (SLM) is a potential additive manufacturing technology, which is based on the forming principle of layered manufacturing and layer-by-layer stacking, and adopts high-energy-density Laser beams to melt a metal powder bed point-by-point, line-by-line and layer-by-layer, so that a complex-shaped part with good metallurgical bonding, dimensional accuracy and surface quality can be directly manufactured in one step. So far, many cases have been reported for successful forming of titanium alloy, aluminum alloy, magnesium alloy, stainless steel, copper alloy, high temperature alloy, etc. by applying this technique. In the prior art, the laser beam is rapidly positioned and switched in position by scanning a galvanometer, and scanning strategies of the SLM are linear gratings, namely, a scanning line is a one-dimensional straight line.
However, the SLM technique based on "line scanning" has the following problems: first, the laser and powder exposure time due to high speed "line" scanning is only 10-4s-10-5s, the laser generated melt pool during the forming process is 10-4mm3Size-class micro-melting pool, laser power density up to 105W/cm2-107W/cm2Cooling rate as high as 106K/s-108K/s, temperature gradient at 105In the order of DEG C/mm. On the one hand, a higher energy input will leadThe liquid metal in the molten pool is evaporated and vaporized, the generated recoil pressure discharges the surrounding molten metal to form pores, and the phenomena of the pore effect and the pore collapse cause serious pore defects, particularly for light alloys with low melting point and high boiling point, such as magnesium alloy, aluminum alloy, titanium-aluminum intermetallic compounds and the like, the density is reduced, and simultaneously the burning loss of elements (such as Al, Mg and the like) is also aggravated. On the other hand, higher temperature gradients and extremely fast cooling rates will generate larger residual thermal stresses, which are likely to cause cracking of brittle material (intermetallic compounds, ceramics, etc.) parts. Secondly, the local heating unevenness of the part is caused by the rapid 'linear' movement of the heat source in the micro area, and the uneven microstructure is caused by the complicated horizontal and vertical thermal cycle influence generated by a plurality of layers, so that the mechanical property of the part is damaged. Therefore, the linear scanning strategy has great limitation in the field of selective laser melting forming of light alloy, brittle difficult-to-process materials and the like.
In addition, the size of the molten pool formed by linear scanning is small, the number of scanning channels required for forming a single-layer solid is increased, the processing time is long, and the manufacturing efficiency of the SLM technology is low. However, studies have been made to shorten the processing time and improve the forming efficiency by increasing the laser power (1000W-2000W) and the single-layer deposition thickness (100 μm-200 μm). However, the experimental results show that: the increase of the laser power easily causes the surface of the part to be seriously piled up, and finally the part fails to be formed. Therefore, the existing "linear raster" scanning strategy cannot effectively improve the processing efficiency of SLM forming.
Research indicates that additional physical fields including electromagnetic fields, ultrasonic fields, current fields, physical vibration, composite fields and the like are introduced to vibrate and stir the molten pool in the rapid fusing process, and the method has the beneficial effects of accelerating gas escape, promoting non-spontaneous nucleation of the molten pool, refining crystal grains, reducing temperature gradient, inhibiting stress cracking, improving formability, improving toughness and the like. But the SLM forming process is carried out in a closed cavity, and the production equipment and the preparation process are complex due to the use of an additional physical external field, so that the production cost is greatly increased; meanwhile, when large precise complex parts are prepared, the uniform vibration stirring effect is difficult to realize by applying a physical external field, so that the technology cannot be applied to SLM forming.
Disclosure of Invention
In view of the above, the present invention provides a self-perturbing laser additive manufacturing method that overcomes, or at least partially solves, the above mentioned problems.
In order to solve the technical problem, the invention provides a self-disturbance laser additive manufacturing method, which comprises the following steps:
acquiring structural characteristics of a formed part;
acquiring thermophysical parameters of a forming material;
constructing a self-disturbance laser additive manufacturing system;
designing a self-disturbance parameter of a laser beam of the self-disturbance laser additive manufacturing system according to the structural feature and the thermophysical parameter;
setting forming process parameters of the laser beam according to the structural characteristics and the thermophysical parameters;
manufacturing the formed part according to the self-disturbance parameters and the forming process parameters.
Preferably, said obtaining structural features of the shaped part comprises the steps of:
acquiring cantilever parameters of the formed part;
acquiring inner runner parameters of the formed part;
obtaining porosity parameters of the formed part;
and acquiring the complex curved surface parameters of the formed part.
Preferably, the obtaining of the thermophysical parameters of the forming material comprises the steps of:
obtaining a density parameter of the forming material;
obtaining a melting point parameter of the forming material;
obtaining a boiling point parameter of the forming material;
acquiring laser absorptivity parameters of the forming material;
acquiring a thermal conductivity coefficient parameter of the forming material;
and acquiring the specific heat capacity parameter of the forming material.
Preferably, the self-perturbing laser additive manufacturing system comprises: system software, controller, laser instrument, beam expander, scanning mirror that shakes, focusing mirror, base plate, send whitewashed device, shop's powder device, shaping jar and powder recovery unit, wherein, the controller respectively with system software the laser instrument the beam expander the scanning mirror that shakes shop the powder device with the shaping jar is connected, the beam expander set up in the laser instrument with the scanning shakes between the mirror, the focusing mirror set up in scanning shake mirror with between the base plate, the base plate set up in inside the shaping jar, and with scanning mirror that shakes with the focusing mirror collineation, send whitewashed device set up in preset position around the base plate for to send into the powder on the base plate, shop's powder device next-door neighbour the base plate upper surface sets up, be used for with send the powder that whitewashed device sent into shop in the base plate upper surface, powder recovery unit next-door neighbour the base plate left and right sides sets up, for recovering the powder remaining on the substrate.
Preferably, the system software comprises: and the forming process parameter control software and the self-disturbance parameter control software are respectively connected with the controller.
Preferably, the controller includes: the forming device comprises a forming process parameter controller and a self-disturbance parameter controller, wherein the forming process parameter control software is connected with the forming process parameter controller, the self-disturbance parameter control software is connected with the self-disturbance parameter controller, the forming process parameter controller is respectively connected with the laser, the beam expander, the scanning galvanometer, the powder spreading device and the forming cylinder, and the self-disturbance parameter controller is connected with the scanning galvanometer.
Preferably, the designing the self-disturbance parameter of the laser beam of the self-disturbance laser additive manufacturing system according to the structural feature and the thermophysical parameter comprises the steps of:
designing a unit disturbance pattern parameter of the laser beam;
designing a perturbation period of the laser beam;
designing the disturbance times of the laser beam;
designing a perturbation interval of the laser beam;
designing the disturbance speed of the laser beam;
designing the disturbance direction of the laser beam;
designing the advancing direction of the laser beam;
determining the scanning interval of the laser beam according to the unit disturbance pattern parameters;
and determining the position coordinates of any point in the periodic two-dimensional graph formed by the laser beams according to the unit disturbance graph parameters, the disturbance times and the disturbance intervals.
Preferably, the expression of the position coordinates is:
wherein x represents the abscissa of the position coordinate, y represents the ordinate of the position coordinate, a represents the unit disturbance pattern parameter, N represents the disturbance times, S represents the disturbance interval, and t represents the value interval.
Preferably, the setting of the forming process parameters of the laser beam according to the structural features and the thermophysical parameters comprises the steps of:
setting the laser power of the laser beam;
setting a phase angle of the laser beam;
setting a delamination thickness of the laser beam.
Preferably, said manufacturing said formed part according to said self-disturbance parameters and said forming process parameters comprises the steps of:
laying a layer of powder on the surface of a substrate;
controlling the laser beam to perform periodic pattern scanning on the powder according to the self-disturbance parameter and the forming process parameter;
acquiring a scanning channel formed by scanning;
overlapping all the scanning channels to form a deposition layer;
and depositing layer by layer to manufacture the whole formed part.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
(1) the method has the advantages that the stirring of the liquid molten pool is realized under the condition of no extra physical field by converting the one-dimensional linear scanning of the laser beam in the prior SLM technology into the periodic two-dimensional pattern disturbance, so that the method has the functions of homogenizing microstructure, refining crystal grains, inhibiting element burning loss, reducing metallurgical defects such as cracks and air holes, increasing the size of the molten pool and shortening the processing time, ensures that parts have excellent comprehensive mechanical properties, and can greatly improve the forming efficiency;
(2) the 'periodic two-dimensional pattern disturbance' strategy provided by the invention can enhance the flow of liquid metal, is beneficial to the escape of bubbles and reduces the porosity; the laser beam stirs the liquid molten pool, prolongs the solidification time of the molten pool, reduces the temperature gradient and the solidification rate, and inhibits the formation of crystal cracks; in addition, the disturbance of the laser along the periodic graph curve can homogenize the distribution of energy inside the molten pool, reduce the burning loss of elements, promote the non-spontaneous nucleation of the molten pool, change the preferred growth direction of columnar crystals so as to refine the crystal grains, avoid the phenomenon of nonuniform structure caused by nonuniform local heating, and finally improve the obdurability of the alloy;
(3) the single-channel line width is greatly increased (mm magnitude, the single-channel line width obtained by the existing SLM linear grating scanning strategy is mum magnitude) by regulating and controlling the unit disturbance pattern parameters, the number of melting channels is reduced, the processing time is shortened, and the forming efficiency is greatly improved. Meanwhile, the flow direction of liquid metal in the molten pool is regulated and controlled by planning the graphic curve of the scanning line, the flatness of the surface of the fusing channel is ensured, the stacking height phenomenon of parts under high-power large-layer thickness can be effectively inhibited, and SLM forming under high-power large-layer thickness is realized, so that the production efficiency of the parts can be further improved, and the processing cost is reduced;
(4) the method is not only suitable for the SLM technology of a single laser beam, but also suitable for the multi-beam SLM technology of a plurality of laser beams, can ensure the uniform disturbance effect of large-size complex precision parts while improving the forming efficiency, and has important engineering application value;
(5) the method is suitable for selective laser melting forming of titanium alloy, aluminum alloy, high-temperature alloy, magnesium alloy, stainless steel, high-entropy alloy, copper alloy, brittle difficult-to-process materials (intermetallic compounds, pure tungsten, ceramics and the like) and other materials, and is a flexible advanced manufacturing technology which saves cost, is efficient and clean.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a self-disturbance laser additive manufacturing method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a periodic two-dimensional graph obtained by a self-perturbing laser additive manufacturing method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of embodiment 1 of a self-disturbance laser additive manufacturing system in a self-disturbance laser additive manufacturing method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of embodiment 2 of a self-disturbance laser additive manufacturing system in a self-disturbance laser additive manufacturing method according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an actual perturbation track of a laser beam obtained in embodiment 2 of a self-perturbation laser additive manufacturing system in a self-perturbation laser additive manufacturing method according to an embodiment of the present invention;
FIG. 6 is a metallographic photograph and a microstructure photograph of a longitudinal section of a sample formed using a prior art "one-dimensional line scan" strategy;
fig. 7 is a metallographic photograph and a microstructure photograph of a longitudinal section of a sample formed by a "circular periodic disturbance" strategy in a self-disturbance laser additive manufacturing method provided by an embodiment of the invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In an embodiment of the present application, as shown in fig. 1, the present invention provides a self-disturbance laser additive manufacturing method, including the steps of:
s1: acquiring structural characteristics of a formed part;
in an embodiment of the present application, the obtaining structural features of the formed part includes:
acquiring cantilever parameters of the formed part;
acquiring inner runner parameters of the formed part;
obtaining porosity parameters of the formed part;
and acquiring the complex curved surface parameters of the formed part.
In the embodiment of the present application, when performing self-disturbance laser additive manufacturing, first, structural features of a designed formed part are obtained, where the structural features include: cantilever parameters, inner runner parameters, porous parameters, complex curved surface parameters and the like can be increased according to requirements. Generally, the design of the formed part is often performed on a professional design software, and the corresponding structural features of the formed part can be directly read through a parameter reading button on the software. By acquiring the structural characteristics of the formed part, the structure of the formed part can be comprehensively and carefully known, and the laser beam forming operation steps can be more comprehensively and accurately controlled in the subsequent forming process, so that the required formed part can be obtained.
S2: acquiring thermophysical parameters of a forming material;
in an embodiment of the present application, the obtaining of the thermophysical parameter of the forming material includes:
obtaining a density parameter of the forming material;
obtaining a melting point parameter of the forming material;
obtaining a boiling point parameter of the forming material;
acquiring laser absorptivity parameters of the forming material;
acquiring a thermal conductivity coefficient parameter of the forming material;
and acquiring the specific heat capacity parameter of the forming material.
In the embodiment of the present application, when performing self-disturbance laser additive manufacturing, it is further required to obtain thermophysical parameters of a forming material, where the thermophysical parameters include: the density parameter, the melting point parameter, the boiling point parameter, the laser absorption rate parameter, the thermal conductivity parameter, the specific heat capacity parameter and the like can be obtained through professional books or documents related to the forming material, can also be obtained through network query, and even can be obtained through measuring a certain required parameter of the forming material by using a detection instrument. By obtaining the thermophysical parameters of the forming material, the characteristics of the forming material can be comprehensively and carefully known, so that the operation steps of the laser beam on the forming material can be more accurately utilized and controlled in the subsequent forming process, and the required forming part can be obtained.
S3: constructing a self-disturbance laser additive manufacturing system;
in an embodiment of the present application, the self-disturbance laser additive manufacturing system includes: system software, controller, laser instrument, beam expander, scanning mirror that shakes, focusing mirror, base plate, send whitewashed device, shop's powder device, shaping jar and powder recovery unit, wherein, the controller respectively with system software the laser instrument the beam expander the scanning mirror that shakes shop the powder device with the shaping jar is connected, the beam expander set up in the laser instrument with the scanning shakes between the mirror, the focusing mirror set up in scanning shake mirror with between the base plate, the base plate set up in inside the shaping jar, and with scanning mirror that shakes with the focusing mirror collineation, send whitewashed device set up in preset position around the base plate for to send into the powder on the base plate, shop's powder device next-door neighbour the base plate upper surface sets up, be used for with send the powder that whitewashed device sent into shop in the base plate upper surface, powder recovery unit next-door neighbour the base plate left and right sides sets up, for recovering the powder remaining on the substrate.
In the embodiment of the application, the powder is sent to the substrate by the powder sending device, the system software can acquire the set forming process parameters and the set self-disturbance parameters, the system software sends an instruction to the powder laying device through the controller, the powder laying device lays the powder on the substrate, the system software sends the parameters to the controller, the controller controls the laser to send laser beams with preset parameters, the laser beams are sent to the scanning galvanometer through the beam expander, the scanning galvanometer deflects the laser beams and converges the laser beams to the powder of the substrate through the focusing mirror, and the laser beams irradiate the powder and perform selective melting forming.
In an embodiment of the present application, the system software includes: and the forming process parameter control software and the self-disturbance parameter control software are respectively connected with the controller.
In an embodiment of the present application, the controller includes: the forming device comprises a forming process parameter controller and a self-disturbance parameter controller, wherein the forming process parameter control software is connected with the forming process parameter controller, the self-disturbance parameter control software is connected with the self-disturbance parameter controller, the forming process parameter controller is respectively connected with the laser, the beam expander, the scanning galvanometer, the powder spreading device and the forming cylinder, and the self-disturbance parameter controller is connected with the scanning galvanometer.
In the embodiment of the application, the system software comprises forming process parameter control software and self-disturbance parameter control software, the controller comprises a forming process parameter controller and a self-disturbance parameter controller, wherein the forming process parameter control software is connected with the forming process parameter controller and is used for setting forming process parameters such as laser power, scanning distance and phase angle of a single beam or multiple beams, and motion parameters such as layering thickness, and transmitting the parameters to the forming process parameter controller. And the forming process parameter controller is connected with the laser, the beam expander, the scanning galvanometer, the powder paving device and the forming cylinder and is used for controlling the output and scanning of the laser beam and the movement displacement and speed of the powder paving device and the forming cylinder. The self-disturbance parameter control software is connected with the self-disturbance parameter controller and is used for setting self-disturbance parameters such as single-beam or multi-beam unit disturbance graphic parameters, disturbance period, disturbance times, disturbance interval, disturbance speed, disturbance direction, advancing direction and the like and transmitting the self-disturbance parameters to the self-disturbance parameter controller.
S4: designing a self-disturbance parameter of a laser beam of the self-disturbance laser additive manufacturing system according to the structural feature and the thermophysical parameter;
in an embodiment of the present application, said designing a self-disturbance parameter of a laser beam of said self-disturbance laser additive manufacturing system according to said structural feature and said thermophysical parameter comprises the steps of:
designing a unit disturbance pattern parameter of the laser beam;
designing a perturbation period of the laser beam;
designing the disturbance times of the laser beam;
designing a perturbation interval of the laser beam;
designing the disturbance speed of the laser beam;
designing the disturbance direction of the laser beam;
designing the advancing direction of the laser beam;
determining the scanning interval of the laser beam according to the unit disturbance pattern parameters;
and determining the position coordinates of any point in the periodic two-dimensional graph formed by the laser beams according to the unit disturbance graph parameters, the disturbance times and the disturbance intervals.
In this embodiment of the application, after the structural feature and the thermophysical parameter are obtained, the self-disturbance parameter of the laser beam of the self-disturbance laser additive manufacturing system may be designed as needed, and specifically, the self-disturbance parameter includes: the unit disturbance pattern parameters, disturbance period, disturbance times, disturbance interval, disturbance speed, disturbance direction, advancing direction and scanning interval.
As shown in fig. 2, in the embodiment of the present application, laser beam irradiation may form a two-dimensional unit perturbation pattern, where the unit perturbation pattern includes a regular pattern, such as a circle, a triangle, a square, a rectangle, a diamond, a regular hexagon, and the like, and also includes any closed irregular two-dimensional pattern, and different unit perturbation patterns may be adopted for different structural portions of the same formed part. Each perturbation graph has corresponding unit perturbation graph parameters, wherein the unit perturbation graph parameters are the sizes of the perturbation graphs, such as the radius of a circle, the side length and the internal angle of a triangle, the side length of a square and a rectangle, the side length and the internal angle of a rhombus, and the like; the disturbance period refers to the time required for the laser beam to complete one unit disturbance pattern; the disturbance times refer to the number of unit disturbance patterns in one scanning channel; the disturbance interval refers to the distance between two adjacent unit disturbance patterns; the disturbance direction refers to the laser beam disturbance along the clockwise direction or along the counterclockwise direction; the forward direction refers to the forward moving direction of the forming melting channel; the scanning pitch determines the number of tracks of the periodic two-dimensional pattern perturbation formed by the laser beam, which overlap to form the deposited layer. The self-disturbance parameters are matched with each other to form different periodic two-dimensional graphs.
In the embodiment of the present application, the position coordinates of any reference point in a two-dimensional pattern formed by a laser beam can be determined according to the unit disturbance pattern parameters set in the above steps, and the expression of the position coordinates is as follows:
wherein x represents the abscissa of the position coordinate, y represents the ordinate of the position coordinate, a represents the unit disturbance pattern parameter, N represents the disturbance times, S represents the disturbance interval, and t represents the value interval.
S5: setting forming process parameters of the laser beam according to the structural characteristics and the thermophysical parameters;
in an embodiment of the present application, the setting of the forming process parameters of the laser beam according to the structural features and the thermophysical parameters includes:
setting the laser power of the laser beam;
setting a phase angle of the laser beam;
setting a delamination thickness of the laser beam.
In this embodiment of the present application, after obtaining the structural feature and the thermophysical parameter, a forming process parameter of the laser beam may be set as required, where the forming process parameter includes: laser power, phase angle, layer thickness, etc. By setting the forming process parameters of the laser beam, the laser beam can be controlled more accurately in the subsequent forming process, so that the required formed part can be obtained.
S6: manufacturing the formed part according to the self-disturbance parameters and the forming process parameters.
In an embodiment of the present application, said manufacturing said formed part according to said self-disturbance parameters and said forming process parameters comprises the steps of:
laying a layer of powder on the surface of a substrate;
controlling the laser beam to perform periodic pattern scanning on the powder according to the self-disturbance parameter and the forming process parameter;
acquiring a scanning channel formed by scanning;
overlapping all the scanning channels to form a deposition layer;
and depositing layer by layer to manufacture the whole formed part.
In the embodiment of the application, after the self-disturbance parameters and the forming process parameters are set, a layer of powder is laid on the surface of a substrate by using a powder laying device, then a laser is started, the laser emits laser beams according to the self-disturbance parameters and the forming process parameters set in the steps, the laser beams are irradiated to a scanning galvanometer through a beam expander, optical lenses in the scanning galvanometers deflect, and the laser beams are controlled to perform two-dimensional pattern periodic scanning on the powder on the surface of the substrate respectively, namely the laser beams are disturbed clockwise or anticlockwise along respective periodic two-dimensional patterns, so that a molten pool is stirred, and then the liquid molten pool is solidified; when the number of the disturbance graphs of each unit reaches the disturbance times, one scanning track is formed; the scanning distance determines the number of the periodic pattern disturbance tracks, and the tracks are overlapped to form a deposition layer in the forming process. And after the front layer is scanned, the forming cylinder descends by a layered thickness and repeats the steps, and the layers are deposited layer by layer until the whole formed part is manufactured.
Example 1:
as shown in fig. 3, the self-disturbance laser additive manufacturing system provided by the present invention is a bidirectional powder-spreading method, and includes system software 1, a controller 4, a laser 7, a beam expander 8, a scanning galvanometer 9, a focusing mirror 10, a substrate 13, first and second powder-feeding devices 14 and 14 ', a powder-spreading device 15, a forming cylinder 16, and first and second powder-recovering devices 17 and 17'. The system software 1 comprises forming process parameter control software 2 and self-disturbance parameter control software 3, the controller 4 comprises a forming process parameter controller 5 and a self-disturbance parameter controller 6, wherein the forming process parameter control software 2 is connected with the forming process parameter controller 5 and is used for setting forming process parameters such as laser power P, scanning distance H and phase angle theta and motion parameters such as layered thickness delta and transmitting the parameters to the forming process parameter controller 5. The forming process parameter controller 5 is connected with the laser 7, the beam expander 8, the scanning galvanometer 9, the powder spreading device 15 and the forming cylinder 16 and is used for controlling the output and scanning of the laser and the movement displacement and speed of the powder spreading device 15 and the forming cylinder 16. The self-disturbance parameter control software 3 is connected with the self-disturbance parameter controller 6, and is used for setting the self-disturbance parameters such as the unit disturbance graphic parameter A, the disturbance period T, the disturbance times N, the disturbance interval S, the disturbance speed V, the disturbance direction and the advancing direction, and transmitting the self-disturbance parameters to the self-disturbance parameter controller 6. The self-disturbance parameters cooperate to form different periodic two-dimensional patterns, as shown in FIG. 2. The self-disturbance parameter controller 6 is connected with the scanning galvanometer 9, a pair of scanning galvanometer mirror groups 11 are arranged in the scanning galvanometer, and the laser beam 12 is controlled to be disturbed along the periodic two-dimensional graph through deflection of optical lenses in the scanning galvanometer mirror groups 11. The laser 7 emits laser beams, which are expanded by a beam expander 8 and then reach a scanning galvanometer 9, and then are focused by a focusing mirror 10 positioned below the scanning galvanometer and act on the surface 13 of the substrate. The powder spreading device 15 spreads a layer of powder on the substrate surface before laser scanning. After the forming cylinder 16 is lowered by a layering thickness after a layer is processed, the first or second powder feeding device 14 or 14 'supplies powder, the powder spreading device 15 continues to spread the powder on the surface of the substrate, and the first or second powder recovery device 17 or 17' recovers the powder. The first powder feeding device 14, the second powder feeding device 14 ', the first powder recovery device 17 and the second powder recovery device 17' are respectively positioned at two sides of the forming cylinder 16, so that bidirectional powder feeding and powder recovery are realized.
Specifically, the self-disturbance laser additive manufacturing method provided by the invention comprises the following steps:
step 1: designing self-disturbance parameters according to the structural characteristics of the formed part and thermophysical parameters of the used powder material, namely setting self-disturbance parameters such as a unit disturbance graphic parameter A, a disturbance period T, a disturbance frequency N, a disturbance interval S, a disturbance speed V, a disturbance direction, a forward direction and the like;
step 2: setting forming technological parameters such as laser power P, phase angle theta, layered thickness delta and the like according to the structural characteristics of the formed part and the thermophysical parameters of the used powder material; setting a scanning interval H according to the unit disturbance figure parameter A set in the step;
and 3, step 3: the powder is supplied by the first or second powder feeder 14 or 14 ', the powder laying device 15 lays a layer of powder on the substrate surface 13 before laser scanning, and the excess powder is recovered by the first and second powder recovery devices 17, 17'. Controlling the laser beam 12 to perform two-dimensional pattern periodic scanning on the powder on the surface of the substrate by deflecting an optical lens in the scanning galvanometer mirror group 11 according to the self-disturbance parameters and the forming process parameters set in the steps, namely, the laser beam 12 is disturbed clockwise or anticlockwise along the periodic two-dimensional pattern so as to stir the molten pool, then the liquid molten pool is solidified, and when the number of unit disturbance patterns reaches the disturbance times N, one scanning track is formed; the scanning distance determines the number of the periodic two-dimensional pattern disturbance tracks, and the tracks are overlapped to form a deposition layer;
and 4, step 4: after the front layer is scanned, the forming cylinder 16 is lowered by a layering thickness, the step 3 is repeated, and the layer-by-layer deposition is carried out until the whole formed part is manufactured.
Example 2:
as shown in fig. 4, the self-disturbance laser additive manufacturing system provided by the present invention is a bidirectional powder-spreading method, and includes system software 1, a controller 4, first and second lasers 7 and 7 ', first and second beam expanders 8 and 8', first and second scanning galvanometers 9 and 9 ', first and second focusing mirrors 10 and 10', a substrate 13, first and second powder feeding devices 14 and 14 ', a powder-spreading device 15, a forming cylinder 16, and first and second powder recovery devices 17 and 17'. The system software 1 comprises forming process parameter control software 2 and self-disturbance parameter control software 3, and the controller 4 comprises a forming process parameter controller 5 and a self-disturbance parameter controller 6. The forming process parameter control software 2 is connected with the forming process parameter controller 5, and is used for setting process parameters such as laser power P1, P2, scanning interval rigid, H2, phase angles theta 1 and theta 2 and motion parameters such as layered thickness delta and transmitting the process parameters to the forming process parameter controller 5. The forming process parameter controller 5 is connected with the first and second lasers 7 and 7 ', the first and second beam expanders 8 and 8 ', the first and second scanning galvanometers 9 and 9 ', the powder spreading device 15 and the forming cylinder 16, and is used for controlling the output and scanning of the laser and the movement displacement and speed of the powder spreading device 15 and the forming cylinder 16. The self-disturbance parameter control software 3 is connected to the self-disturbance parameter controller 6, and is configured to set the unit disturbance pattern parameters a1, a2 of the first and second laser beams 12, 12', the disturbance periods T1, T2, the disturbance times N1, N2, the disturbance intervals S1, S2, the disturbance speeds V1, V2, the disturbance direction, the forward direction, and other self-disturbance parameters, and transmit the parameters to the self-disturbance parameter controller 6. The self-disturbance parameters are matched with each other to form different periodic two-dimensional graphs, the self-disturbance parameters of the double beams can be the same or different, and the two periodic two-dimensional graphs are superposed to form an actual disturbance track, as shown in fig. 5. The self-disturbance parameter controller 6 is connected with the first and second scanning galvanometers 9, 9 ', a pair of scanning galvanometer mirror groups 11, 11' are respectively arranged in the scanning galvanometers, and the first and second laser beams 12, 12 'are respectively controlled to be disturbed along the periodic two-dimensional graph by the deflection of optical lenses in the scanning galvanometer mirror groups 11, 11'. Laser beams emitted by the first laser 7 and the second laser 7 'are expanded by the first beam expander 8 and the second beam expander 8', respectively, and then reach the first scanning galvanometer 9 and the second scanning galvanometer 9 ', and are focused by the first focusing mirror 10 and the second focusing mirror 10' which are positioned below the scanning galvanometer, and then act on the surface 13 of the substrate. The powder spreading device 15 spreads a layer of powder on the substrate surface before laser scanning. After the forming cylinder 16 is lowered by a layering thickness after a layer is processed, the first or second powder feeding device 14 or 14 'supplies powder, the powder spreading device 15 continues to spread the powder on the surface of the substrate, and the first or second powder recovery device 17 or 17' recovers the powder. The first powder feeding device 14, the second powder feeding device 14 ', the first powder recovery device 17 and the second powder recovery device 17' are respectively positioned at two sides of the forming cylinder 16, so that bidirectional powder feeding and powder recovery are realized.
Specifically, the self-disturbance laser additive manufacturing method provided by the invention comprises the following steps:
step 1: designing self-disturbance parameters of the first laser beam and the second laser beam according to the structural characteristics of a formed part and thermophysical parameters of a used powder material, and respectively setting self-disturbance parameters of unit disturbance pattern parameters A1 and A2, disturbance periods T1 and T2, disturbance times N1 and N2, disturbance intervals S1 and S2, disturbance speeds V1 and V2, a disturbance direction, a forward direction and the like of the double beams;
step 2: setting forming process parameters such as laser power P1, P2, phase angle theta 1, theta 2 and layered thickness delta of the first laser beam and the second laser beam respectively according to the structural characteristics of the formed part and the thermophysical parameters of the used powder material; setting the scanning intervals H1 and H2 of each light beam according to the unit disturbance pattern parameters A1 and A2 set in the steps;
and 3, step 3: the first or second powder feeder 14 or 14 'supplies powder, the powder laying device 15 lays a layer of powder on the substrate surface 13 before laser scanning, and the excess powder is recovered by the first and second powder recovery devices 17, 17'. According to the self-disturbance parameters and the forming process parameters of the double laser beams set in the steps, the first laser beam 12 and the second laser beam 12 'are respectively controlled to carry out equidirectional or reverse two-dimensional pattern periodic scanning on the powder on the surface of the substrate through the deflection of the optical lenses in the first scanning galvanometer mirror group 11 and the second scanning galvanometer mirror group 11', namely the first laser beam and the second laser beam are disturbed (clockwise or anticlockwise) along equidirectional or reverse periodic two-dimensional patterns so as to stir the molten pool, and then the liquid molten pool is solidified; when the number of the two unit disturbance graphs reaches the disturbance times N, one scanning track is formed; the number of the two periodic pattern disturbances is determined by the two scanning intervals, and the tracks are overlapped to form a deposition layer;
and 4, step 4: after the front layer is scanned, the forming cylinder 16 is lowered by a layering thickness, the step 3 is repeated, and the layer-by-layer deposition is carried out until the whole formed part is manufactured.
In order to verify the effects of the present invention, the following examples are further illustrated.
Example 3:
the single-beam self-disturbance laser additive manufacturing system is adopted to prepare a Ti-43Al-9V-0.5Y (at.%) alloy thin-wall test sample, the scanning strategy is circular periodic disturbance, and the length of the test sample is 10 mm. The test raw material is Ti-43Al-9V-0.5Y (at.%) alloy powder blown by gas atomization, and the particle size of the powder is 15-53 mu m. In order to ensure the powder fluidity, the alloy powder is kept at 100 ℃ for 1h in a vacuum drying oven before the test. The self-disturbance laser additive manufacturing method comprises the following steps:
step 1: determining the laser motion track as periodic circular disturbance, and setting self-disturbance parameters: the radius of the circle is 1mm, the disturbance frequency is 100, the distance between two adjacent circles is the same and is 0.1mm, the disturbance speed is 20mm/s, the disturbance direction is clockwise, and then the position coordinate (x) of any point Q in the periodic disturbance graph is calculatedQ，yQ) Can be determined by the following equation:
wherein t is a value interval.
Step 2: setting forming process parameters: the laser power is 300W, the lamination thickness is 100 μm, the phase angle is 0 DEG, and the number of scanning tracks is 1.
And 3, step 3: the first or second powder feeder 14 or 14 'supplies powder, the powder laying device 15 lays a layer of powder on the substrate surface 13 before laser scanning, and the excess powder is recovered by the first and second powder recovery devices 17, 17'. Controlling the laser beam 12 to perform circular periodic scanning on the powder on the surface of the substrate by deflecting an optical lens in the scanning galvanometer mirror group 11 according to the circular disturbance parameters and the forming process parameters set in the steps, namely stirring a molten pool by the laser beam 12 along the periodic circular clockwise disturbance, and then solidifying the liquid molten pool to form a deposition layer, wherein each layer only has 1 scanning channel;
and 4, step 4: after the front layer is scanned, the forming cylinder 16 is lowered by a layering thickness, the step 3 is repeated, and the layer-by-layer deposition is carried out until the whole formed part is manufactured.
For comparison, a Ti-43Al-9V-0.5Y (at.%) alloy thin-wall sample with a length of 10mm was also prepared by setting the scanning mode to "one-dimensional linear scanning", i.e. without setting the self-disturbance parameters.
Fig. 6 and 7 are metallographic and microscopic photographs, respectively, of longitudinal sections of samples formed using the "one-dimensional line scan" strategy and the "circular periodic perturbation" strategy. The comparison shows that the method realizes the stirring of the liquid molten pool by converting the linear scanning mode of the laser beam into the circular periodic disturbance, can obviously eliminate the defects of pores and cracks of TiAl alloy formed by melting in a laser selection area, and obtains uniform and fine equiaxial crystal structures. The reason is that the periodic two-dimensional pattern disturbance strategy provided by the method can enhance the flow of the liquid metal, is beneficial to the escape of bubbles and reduces the porosity; meanwhile, the stirring of the laser beam to the liquid molten pool prolongs the solidification time of the molten pool, reduces the temperature gradient and the solidification rate, and inhibits the formation of crystal cracks; in addition, the disturbance of the laser along the periodic graph curve can homogenize the distribution of the energy in the molten pool, reduce the burning loss of elements, promote the non-spontaneous nucleation of the molten pool, change the preferred growth direction of columnar crystals so as to refine the crystal grains, obtain isometric crystals and avoid the phenomenon of uneven structure caused by uneven local heating.
Example 4:
the single-beam self-disturbance laser additive manufacturing system is further adopted to prepare a Ti-43Al-9V-0.5Y (at.%) alloy block sample, the size of the sample is 10mm multiplied by 6mm multiplied by 10mm, and the scanning strategy is circular periodic disturbance. Similarly, the test raw material is Ti-43Al-9V-0.5Y (at.%) alloy powder blown by gas atomization, and the particle size of the powder is 15-53 μm. In order to ensure the powder fluidity, the alloy powder is kept at 100 ℃ for 1h in a vacuum drying oven before the test. The method comprises the following steps:
step 1: determining the laser motion track as periodic circular disturbance, and setting self-disturbance parameters: the radius of the circle is 1mm, the disturbance frequency is 100, the distance between two adjacent circles is the same and is 0.1mm, the disturbance speed is 20mm/s, the disturbance direction is clockwise, and then the position coordinate (x) of any point Q in the periodic disturbance graph is calculatedQ，yQ) Can be determined by equation (1).
Step 2: setting forming process parameters: the laser power is 300W, the lamination thickness is 100 μm, the phase angle is 0 degree, the scanning distance is 2mm, namely the number of scanning tracks is 3.
And 3, step 3: the first or second powder feeder 14 or 14 'supplies powder, the powder laying device 15 lays a layer of powder on the substrate surface 13 before laser scanning, and the excess powder is recovered by the first and second powder recovery devices 17, 17'. According to the circular disturbance parameters and the forming process parameters set in the steps, the laser beam 12 is controlled to perform circular periodic scanning on the powder on the surface of the substrate through the deflection of the optical lens in the scanning galvanometer mirror group 11, namely the laser beam 12 is disturbed clockwise along a periodic circle to stir the molten pool, then the liquid molten pool is solidified to form a deposition layer, and each layer is overlapped by 3 scanning channels.
And 4, step 4: after the front layer is scanned, the forming cylinder 16 is lowered by a layering thickness, the step 3 is repeated, and the layer-by-layer deposition is carried out until the whole formed part is manufactured.
The embodiment result shows that the method realizes the stirring of the liquid molten pool by converting the linear scanning mode of the laser beam into the circular periodic disturbance, can obviously eliminate the defects of pores and cracks of TiAl alloy formed by melting in a laser selection area, and obtains uniform and fine isometric crystal structure. In addition, when the method is adopted to form a single-layer sample with the width of 6mm, only 3 scanning channels are needed, if the conventional scanning interval of 0.1mm is adopted, about 60 scanning channels are needed for the single-layer sample with the width of 6mm, and the processing time is greatly prolonged, so that the method realizes the great increase of the line width of the single channel, reduces the number of melting channels, shortens the processing time and greatly improves the forming efficiency.
The self-disturbance laser additive manufacturing method provided by the invention has the following beneficial effects:
(1) the method has the advantages that the stirring of the liquid molten pool is realized under the condition of no extra physical field by converting the one-dimensional linear scanning of the laser beam in the prior SLM technology into the periodic two-dimensional pattern disturbance, so that the method has the functions of homogenizing microstructure, refining crystal grains, inhibiting element burning loss, reducing metallurgical defects such as cracks and air holes, increasing the size of the molten pool and shortening the processing time, ensures that parts have excellent comprehensive mechanical properties, and can greatly improve the forming efficiency;
(2) the 'periodic two-dimensional pattern disturbance' strategy provided by the invention can enhance the flow of liquid metal, is beneficial to the escape of bubbles and reduces the porosity; the laser beam stirs the liquid molten pool, prolongs the solidification time of the molten pool, reduces the temperature gradient and the solidification rate, and inhibits the formation of crystal cracks; in addition, the disturbance of the laser along the periodic graph curve can homogenize the distribution of energy inside the molten pool, reduce the burning loss of elements, promote the non-spontaneous nucleation of the molten pool, change the preferred growth direction of columnar crystals so as to refine the crystal grains, avoid the phenomenon of nonuniform structure caused by nonuniform local heating, and finally improve the obdurability of the alloy;
(3) the single-channel line width is greatly increased (mm magnitude, the single-channel line width obtained by the existing SLM linear grating scanning strategy is mum magnitude) by regulating and controlling the unit disturbance pattern parameters, the number of melting channels is reduced, the processing time is shortened, and the forming efficiency is greatly improved. Meanwhile, the flow direction of liquid metal in the molten pool is regulated and controlled by planning the graphic curve of the scanning line, the flatness of the surface of the fusing channel is ensured, the stacking height phenomenon of parts under high-power large-layer thickness can be effectively inhibited, and SLM forming under high-power large-layer thickness is realized, so that the production efficiency of the parts can be further improved, and the processing cost is reduced;
(4) the method is not only suitable for the SLM technology of a single laser beam, but also suitable for the multi-beam SLM technology of a plurality of laser beams, can ensure the uniform disturbance effect of large-size complex precision parts while improving the forming efficiency, and has important engineering application value;
(5) the method is suitable for selective laser melting forming of titanium alloy, aluminum alloy, high-temperature alloy, magnesium alloy, stainless steel, high-entropy alloy, copper alloy, brittle difficult-to-process materials (intermetallic compounds, pure tungsten, ceramics and the like) and other materials, and is a flexible advanced manufacturing technology which saves cost, is efficient and clean.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. 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)
1. A method of self-perturbing laser additive manufacturing, the method comprising the steps of:
acquiring structural characteristics of a formed part;
acquiring thermophysical parameters of a forming material;
constructing a self-disturbance laser additive manufacturing system;
designing a self-disturbance parameter of a laser beam of the self-disturbance laser additive manufacturing system according to the structural feature and the thermophysical parameter;
setting forming process parameters of the laser beam according to the structural characteristics and the thermophysical parameters;
manufacturing the formed part according to the self-disturbance parameters and the forming process parameters.
2. The method of claim 1, wherein the obtaining structural features of the shaped part comprises:
acquiring cantilever parameters of the formed part;
acquiring inner runner parameters of the formed part;
obtaining porosity parameters of the formed part;
and acquiring the complex curved surface parameters of the formed part.
3. The method of claim 1, wherein the obtaining of the thermophysical parameters of the forming material comprises:
obtaining a density parameter of the forming material;
obtaining a melting point parameter of the forming material;
obtaining a boiling point parameter of the forming material;
acquiring laser absorptivity parameters of the forming material;
acquiring a thermal conductivity coefficient parameter of the forming material;
and acquiring the specific heat capacity parameter of the forming material.
4. The method of claim 1, wherein the system comprises: the device comprises system software, a controller, a laser, a beam expander, a scanning galvanometer, a focusing mirror, a substrate, a powder feeding device, a powder paving device, a forming cylinder and a powder recovery device, wherein the controller is respectively connected with the system software, the laser, the beam expander, the scanning galvanometer, the dysprosium powder device and the forming cylinder, the beam expander is arranged between the laser and the scanning galvanometer, the focusing mirror is arranged between the scanning galvanometer and the substrate, the substrate is arranged in the forming cylinder and is collinear with the scanning galvanometer and the focusing mirror, the powder feeding device is arranged at a preset position around the substrate and is used for feeding powder onto the substrate, the powder paving device is arranged close to the upper surface of the substrate and is used for paving the powder fed by the powder feeding device on the upper surface of the substrate, and the powder recovery device is arranged close to the left side and the right side of the substrate, for recovering the powder remaining on the substrate.
5. The method of claim 4, wherein the system software comprises: and the forming process parameter control software and the self-disturbance parameter control software are respectively connected with the controller.
6. The method of claim 5, wherein the controller comprises: the forming device comprises a forming process parameter controller and a self-disturbance parameter controller, wherein the forming process parameter control software is connected with the forming process parameter controller, the self-disturbance parameter control software is connected with the self-disturbance parameter controller, the forming process parameter controller is respectively connected with the laser, the beam expander, the scanning galvanometer, the powder spreading device and the forming cylinder, and the self-disturbance parameter controller is connected with the scanning galvanometer.
7. The method according to claim 1, wherein the designing the self-disturbance parameter of the laser beam of the self-disturbance laser additive manufacturing system according to the structural feature and the thermophysical parameter comprises:
designing a unit disturbance pattern parameter of the laser beam;
designing a perturbation period of the laser beam;
designing the disturbance times of the laser beam;
designing a perturbation interval of the laser beam;
designing the disturbance speed of the laser beam;
designing the disturbance direction of the laser beam;
designing the advancing direction of the laser beam;
determining the scanning interval of the laser beam according to the unit disturbance pattern parameters;
and determining the position coordinates of any point in the periodic two-dimensional graph formed by the laser beams according to the unit disturbance graph parameters, the disturbance times and the disturbance intervals.
8. The method of claim 6, wherein the position coordinates are expressed as:
wherein x represents the abscissa of the position coordinate, y represents the ordinate of the position coordinate, a represents the unit disturbance pattern parameter, N represents the disturbance times, S represents the disturbance interval, and t represents the value interval.
9. The method of claim 1, wherein the setting of the shaping process parameters of the laser beam according to the structural features and the thermophysical parameters comprises:
setting the laser power of the laser beam;
setting a phase angle of the laser beam;
setting a delamination thickness of the laser beam.
10. The method of claim 1, wherein the manufacturing the shaped part according to the self-disturbance parameters and the shaping process parameters comprises:
laying a layer of powder on the surface of a substrate;
controlling the laser beam to perform periodic pattern scanning on the powder according to the self-disturbance parameter and the forming process parameter;
acquiring a scanning channel formed by scanning;
overlapping all the scanning channels to form a deposition layer;
and depositing layer by layer to manufacture the whole formed part.
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| CN114703430A (en) * | 2022-06-06 | 2022-07-05 | 北京煜鼎增材制造研究院有限公司 | High-boron stainless steel and additive manufacturing method thereof |
| CN114703430B (en) * | 2022-06-06 | 2022-08-23 | 北京煜鼎增材制造研究院有限公司 | High-boron stainless steel and additive manufacturing method thereof |
| DE102022121182A1 (en) | 2022-08-22 | 2024-02-22 | Oerlikon Am Europe Gmbh | Process for improving surface roughness |
| CN115722801A (en) * | 2022-09-09 | 2023-03-03 | 中国航空制造技术研究院 | Method for improving arc additive manufacturing forming precision with assistance of laser |
| CN115722801B (en) * | 2022-09-09 | 2024-04-09 | 中国航空制造技术研究院 | Method for improving arc additive manufacturing forming precision in laser-assisted manner |
| CN117680704A (en) * | 2023-12-12 | 2024-03-12 | 武汉纺织大学 | Method for inhibiting cracks of beta-gamma TiAl alloy manufactured by laser additive |
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