CN115213427A - Additive manufacturing method and product - Google Patents
Additive manufacturing method and product Download PDFInfo
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- CN115213427A CN115213427A CN202210847742.2A CN202210847742A CN115213427A CN 115213427 A CN115213427 A CN 115213427A CN 202210847742 A CN202210847742 A CN 202210847742A CN 115213427 A CN115213427 A CN 115213427A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/50—Treatment of workpieces or articles during build-up, e.g. treatments applied to fused layers during build-up
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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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
- B33Y80/00—Products made by additive manufacturing
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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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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Powder Metallurgy (AREA)
Abstract
The invention relates to the technical field of additive manufacturing, in particular to a method and a product for additive manufacturing. By adopting the method, the current forming layer can be subjected to real-time rolling treatment in the powder bed additive forming process, so that the purpose of eliminating the local buckling deformation area of the current forming layer in real time is realized, and the purpose of improving the yield of the powder bed additive forming part is finally achieved.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a method and a product for additive manufacturing.
Background
With the rapid development of additive manufacturing technology, the additive technology of the powder bed based on the basic principle of 'discrete + accumulation' utilizes high-energy beams to melt and accumulate metal powder layer by layer into a solid metal component, and can realize the rapid and mold-free forming of high-performance complex structural components. At present, the technology is widely applied to the fields of aerospace, automobiles, medical treatment, mold industry and the like.
In the forming process, the process of uniformly spreading the forming powder on the formed surface is involved. However, due to the rapid cooling effect in the forming process of the technology, large internal stress is generated in the forming process, local buckling deformation of a forming layer is easy to occur, and then the phenomenon that a powder spreading scraper collides with a cutter is induced, so that the forming process cannot be continued, and the yield of a formed part is influenced.
Disclosure of Invention
The invention mainly aims to provide an additive manufacturing method and a product, and aims to solve the technical problem of influencing the yield of a powder bed additive formed part.
To achieve the above object, in a first aspect, the present invention provides a method for additive manufacturing, the method comprising the steps of:
laying a powder layer on a surface to be molded;
sintering, melting and forming the powder layer to obtain a current forming layer;
and flattening the current forming layer to obtain a target forming layer.
Optionally, the current molding layer comprises a local buckling deformation area formed by thermal stress concentration;
the step of flattening the current forming layer to obtain a target forming layer includes:
and flattening the local buckling deformation area to eliminate the local buckling deformation area so as to obtain the target forming layer.
Optionally, the step of flattening the local buckling deformation region to eliminate the local buckling deformation region to obtain the target forming layer includes:
and flattening the local buckling deformation area by using a roller to eliminate the local buckling deformation area so as to obtain a target forming layer.
Optionally, the step of flattening the local buckling deformation region to eliminate the local buckling deformation region to obtain the target forming layer includes:
and rolling the local buckling deformation region for at least two times to eliminate the local buckling deformation region to obtain the target forming layer.
Optionally, flattening the local buckling deformation region to eliminate the local buckling deformation region, so as to obtain the target forming layer, including:
and heating the local buckling deformation area, and simultaneously performing rolling treatment to eliminate the local buckling deformation area to obtain the target forming layer.
Optionally, performing a heating process on the local buckling deformation region and simultaneously performing a rolling process to eliminate the local buckling deformation region to obtain the target forming layer, including:
and flattening the local buckling deformation area by using a roller with a target temperature to eliminate the local buckling deformation area so as to obtain a target forming layer.
Optionally, the step of performing flattening processing on the current forming layer to obtain a target forming layer includes:
dividing the current shaping layer into at least two regions to be flattened;
and respectively carrying out flattening treatment on each area to be flattened to obtain the target forming layer.
Optionally, the step of sintering, fusing and shaping the powder layer to obtain a current shaping layer further includes:
and sintering, melting and forming the powder layer by using a high-energy laser beam to obtain the current forming layer.
Optionally, the surface to be formed is a surface of the current forming layer or the surface to be formed is a surface of each target forming layer.
In order to achieve the above object, in a second aspect, the present invention also provides an additive-formed product, which is prepared by the additive manufacturing method according to the first aspect.
According to the technical scheme, a powder layer is firstly paved on a surface to be formed, then a sintering and melting procedure is carried out on the powder layer to obtain a current forming layer, the current forming layer is flattened after the current forming layer is obtained to obtain a target forming layer, and a rolling treatment mode is utilized, so that the technical defect that the subsequent forming of a powder bed additive forming piece cannot be carried out due to thermal stress accumulation generated during sintering and melting in the additive manufacturing process of the powder layer by adopting a sintering method in the related art, and the yield of the powder bed additive forming piece is finally influenced can be solved. By adopting the invention, the current forming layer can be rolled in real time in the powder bed additive forming process, so that the aim of eliminating the local buckling deformation area of the current forming layer in real time is fulfilled, and the aim of improving the yield of the powder bed additive forming part is finally fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a method of additive manufacturing according to the present invention;
FIG. 2 is a detailed flow diagram of the exemplary flow diagram of FIG. 1;
FIG. 3 is a schematic view of the rolling and powder spreading process on the surface of the molded part according to the present invention.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise explicitly stated or limited, the terms "connected", "fixed", and the like are to be understood broadly, for example, "fixed" may be fixedly connected, may be detachably connected, or may be integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B", including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The inventive concept of the present invention will be further elucidated below in connection with some specific embodiments.
The invention provides a method for additive manufacturing and a product.
As shown in fig. 1, an embodiment of the additive manufacturing method of the present invention is provided.
In this embodiment, referring to fig. 1, the additive manufacturing method includes the following steps:
s100, paving a to-be-molded surface to obtain a powder layer;
in this embodiment, when the powder layer is laid on the surface to be formed, the thickness of the laid powder layer needs to be controlled according to the thickness of the current forming layer. In the related art, the thickness of the current shaping layer is 20 μm or 30 μm. While controlling the thickness of the powder layer is achieved by means of a doctor blade.
It should be specifically and explicitly stated that the surfaces to be formed exemplified in the present embodiment include, but are not limited to, the following: the surface of a table in the additive forming zone of the powder bed or the upper surface of a formed part that has already been formed, etc.
In the present embodiment, the raw material of the powder layer of the example may be, but is not limited to, an existing powder material such as a copper alloy.
S200, sintering, melting and forming the powder layer to obtain a current forming layer;
in this embodiment, the powder layer is sintered and melted mainly by using a high-energy laser beam, and the powder layer is melted to form the powder layer by the sintering and melting method.
Of course, in this embodiment, when the high-energy laser beam is controlled to sinter and fuse the powder layer, the high-energy laser beam needs to be controlled to selectively scan the powder layer according to the target path, so that the powder layer forms the current shaping layer. It is convenient to understand that before the high-energy laser beam is controlled to scan and form the powder layer in a selected area, a model of the additive formed part to be manufactured needs to be established, the additive formed part is cut into slices with the thickness of 20 μm or 30 μm and then the model with the cut slices is guided into the powder bed, then powder corresponding to the thickness of each slice of the model is laid on the surface to be formed and the powder layer is formed, then the high-energy laser beam is controlled to scan, sinter, fuse and form the powder layer, and finally the current forming layer with the same surface shape as the corresponding layer of the additive formed layer to be manufactured is obtained.
It should be specifically and clearly noted that the laser selection area exemplified in the present embodiment refers to the area where the powder layer to be sintered and fused is located, which is selected by the laser selection area exemplified in the present embodiment, and is formed by scanning according to the shape corresponding to each layer of the model slice.
S300, flattening the current forming layer to obtain a target forming layer.
In this embodiment, when the currently formed layer is flattened, only the area that needs to be flattened may be flattened, or the entire currently formed layer may be flattened. And (3) carrying out real-time flattening treatment on the current forming layer in the powder bed additive forming process so as to fulfill the aim of eliminating the local buckling deformation area of the current forming layer in real time. In the process of flattening, a rolling mode can be adopted for flattening, and a pressing plate structure matched with the surface of the current forming layer can also be adopted for applying pressure for flattening.
Of course, when the rolling mode is selected to press the current forming layer, the rolling frequency may be one time, or multiple times of rolling may be performed on the same layer. In addition, in this embodiment, the example of performing real-time processing on the additive forming layer means performing flattening processing on the current forming layer each time one current forming layer is completed, and it is easy to understand that the example of performing roll processing in this embodiment means performing roll processing in the forming process of one target forming layer.
The equipment used in the flattening treatment in the present embodiment includes, but is not limited to, rolls and the like.
It should be particularly and explicitly noted that, in this embodiment, the exemplary flattening process is performed by directly applying pressure to the current forming layer for flattening, that is, in the implementation process, no matter whether the current forming layer has a local buckling deformation area, the technology illustrated in this application may apply pressure to the current forming layer and complete at least one flattening process, in this process, the technology illustrated in this embodiment may flatten the local buckling deformation area existing in the current forming layer, and finally, the purpose of eliminating the local buckling deformation area is achieved. Compared with the related art, the technology of the example of the application does not need to detect or judge whether the warping deformation area exists on the current forming layer, and the flattening treatment is regarded as a part of the process.
According to the technical scheme, a powder layer is firstly paved on a surface to be molded, then a sintering and melting procedure is carried out on the powder layer to obtain a current molding layer, after the current molding layer is obtained, the current molding layer is flattened to obtain a target molding layer, and the flattening treatment mode is utilized, so that the technical defect that the subsequent molding of a powder bed additive molding piece cannot be carried out due to the fact that thermal stress accumulation is generated during sintering and melting in the additive manufacturing process of the powder layer by adopting a sintering method in the related art, and the yield of the powder bed additive molding piece is finally influenced can be solved. By adopting the method, the current forming layer can be flattened in real time in the powder bed additive forming process, so that the aim of eliminating the local buckling deformation area of the current forming layer in real time is fulfilled, and the yield of the powder bed additive forming part is finally improved.
In some embodiments, the current shaping layer includes a localized buckling deformation region formed by a concentration of thermal stress;
flattening the current forming layer to obtain a target forming layer, comprising:
and A300, flattening the local buckling deformation area to eliminate the local buckling deformation area so as to obtain the target forming layer.
In this embodiment, a local buckling deformation region formed by local buckling deformation of the current forming layer due to stress concentration in the forming process of each current forming layer can be eliminated in real time in a rolling manner, so that the defects that the thickness of the powder layer is uneven and a scraper for powder laying cannot normally advance due to the existence of the local buckling deformation region when the subsequent powder layer for forming the current forming layer is laid are avoided.
In some embodiments, the step of flattening the localized buckling region to eliminate the localized buckling region to obtain the target shaped layer comprises:
and a300, flattening the local buckling deformation area by using a roller to eliminate the local buckling deformation area so as to obtain the target forming layer.
In this embodiment, the local buckling deformation area is mainly flattened by the roller, so that the local buckling deformation area can be rapidly eliminated by the method.
In this embodiment, it is clear and noted that the cross-sectional diameter of the rolls used is much greater than the thickness of the current forming layer. It can be understood that, when the roll illustrated in the embodiment flattens the local buckling deformation region, the purpose of eliminating the local buckling deformation region can be achieved by directly using the weight of the roll itself and the contact area with the local buckling deformation region.
In some embodiments, the step of flattening the local buckling region to eliminate the local buckling region to obtain the target shaping layer includes:
and rolling the local buckling deformation region for at least two times to eliminate the local buckling deformation region so as to obtain the target forming layer.
In this embodiment, the buckling deformation region is rolled at least twice, so that the same buckling deformation region can be rolled at least twice in the implementation process of the invention, and finally, the function of eliminating the local buckling deformation region of the current forming layer of the same layer is realized.
Certainly, in some improved embodiments, the local buckling deformation region may also be subjected to primary rolling, after the primary rolling is completed, a layer of powder layer is laid on the surface to be formed of the current forming layer, then the powder layer is sintered, melted and formed to form the current forming layer, and then the current forming layer is rolled by using a roller. It is clear that the way the present modified embodiment is exemplified is also applicable to an embodiment where at least two rolling operations are performed to eliminate the local buckling deformation region.
In some embodiments, flattening the localized buckling region to eliminate the localized buckling region to obtain the target shaping layer comprises:
and heating the local buckling deformation area, and simultaneously performing rolling treatment to eliminate the local buckling deformation area to obtain the target forming layer.
In the embodiment, the method for heating the local buckling deformation area is adopted, so that the defect that the local buckling deformation area cannot be completely removed when the local buckling deformation area is flattened by rolling can be solved in the implementation process of the invention.
Of course, in the present embodiment, the exemplary heating process may be, but is not limited to, the following heating manner: sharp rolls heat or directly heat the currently formed layer, etc.
In some embodiments, the heating treatment and the rolling treatment are performed simultaneously on the local buckling deformation region to eliminate the local buckling deformation region, so as to obtain the target forming layer, and the method comprises the following steps:
and flattening the local buckling deformation area by using a roller with the target temperature to eliminate the local buckling deformation area so as to obtain the target forming layer.
In the embodiment, the roller is heated, so that the heat can move along with the roller in the implementation process, and the rolling device has the function of heating the local buckling deformation area which is being rolled in real time, namely, the utilization rate of the heat is improved, and the rolling effect is also improved.
It should be particularly clear and explained that, in the present embodiment, the target temperature of the example may be, but is not limited to, 400 ℃.
In some embodiments, referring to fig. 2, the step of performing a flattening process on the current forming layer to obtain a target forming layer includes:
s310, dividing the current forming layer into at least two areas to be flattened;
in this embodiment, the dividing method for dividing the current forming layer into two or more to-be-rolled nips can be as follows: after the slice segmentation of the model is completed, each current shaping layer is segmented into a plurality of nips to be rolled. Of course, it should be noted that in the process of dividing the to-be-rolled area, the to-be-rolled area of the same to-be-formed piece is divided in the same way, so that the dividing way has the advantage that the movement way of the roller is not adjusted too much in the implementation process of the invention.
In the embodiment, when the device for flattening is a roller, in the process of flattening by applying pressure to each region to be flattened, the friction form generated when the roller applies pressure to the region to be flattened is converted from sliding friction to rolling friction.
It should be specifically and explicitly stated that, in the present embodiment, the manner illustrated in fig. 3 (b) is a manner representing a contact manner between the rolling roller and the surface of the currently-formed layer, and the drawing is also merely exemplary and not limited, that is, the contact manner may be a contact of a roller structure such as a rolling roller, and may also be a pressing plate structure. In addition, fig. 3 (b) is a schematic side or cross-sectional two-dimensional diagram representing the contact manner between the roll and the surface of the currently formed layer, the length in the direction perpendicular to the paper surface may be the length covering the whole width, or may be a small roller, and the small roller may have a freedom of movement in the direction perpendicular to the paper surface, and in combination with an image processing technique, the deformed portion is flattened.
And S320, respectively carrying out flattening treatment on each area to be flattened to obtain a target forming layer.
In this embodiment, when the flattening treatment is performed on each to-be-flattened area, the rolling treatment may be performed on each to-be-rolled area in sequence, or the rolling treatment may be performed in a manner that the rolling is not performed in sequence.
In some embodiments, the step of sintering and fusing the powder layer to obtain the current formed layer further comprises:
and sintering, melting and forming the powder layer by using a high-energy laser beam to obtain the current formed layer.
In the embodiment, the powder layer is sintered, fused and formed by the high-energy laser beam, so that the forming area of the current forming layer can be controlled in the implementation process of the invention, and the forming effect is improved.
In some embodiments, the surface to be shaped is the surface of the currently shaped layer or the surface to be shaped is the surface of each layer of the target shaped layer.
Based on the same inventive concept, the invention also provides an additive formed product prepared by the method of additive manufacturing according to the first aspect.
In this embodiment, referring to fig. 3, after one layer of forming process is completed, local buckling deformation may occur in the edge area formed in rows, as shown in fig. 3 (a), if additive forming is continued in this case, the spreading condition of the powder around the 2-area may be deteriorated, the powder spreading quality in the edge area may be further deteriorated, the forming condition may be further deteriorated, and the forming process may possibly fail. Therefore, in the method, after the formation of one layer is finished, the formed plane is rolled by using a roller, the schematic process can be illustrated by using fig. (b) - (c), the local deformation area can be basically corrected on the formed surface after the rolling by the roller, and the powder spreading and forming of the next layer are not influenced, as shown in fig. (e) - (g), the forming state of the final new layer is shown in fig. (h), and the forming state is consistent with the state shown in fig. (a). Thus, the processes (a) to (h) are circulated repeatedly, and the normal operation of the forming process can be ensured.
According to the technical scheme, a powder layer is firstly paved on a surface to be formed, then a sintering and melting procedure is carried out on the powder layer to obtain a current forming layer, the current forming layer is flattened after the current forming layer is obtained to obtain a target forming layer, and a rolling treatment mode is utilized, so that the technical defect that the subsequent forming of a powder bed additive forming piece cannot be carried out due to thermal stress accumulation generated during sintering and melting in the additive manufacturing process of the powder layer by adopting a sintering method in the related art, and the yield of the powder bed additive forming piece is finally influenced can be solved. By adopting the method, the current forming layer can be subjected to real-time rolling treatment in the powder bed additive forming process, so that the purpose of eliminating the local buckling deformation area of the current forming layer in real time is realized, and the purpose of improving the yield of the powder bed additive forming part is finally achieved.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A method of additive manufacturing, the method comprising the steps of:
laying a powder layer on a surface to be molded;
sintering, melting and forming the powder layer to obtain a current forming layer;
and flattening the current forming layer to obtain a target forming layer.
2. The method of additive manufacturing of claim 1, wherein the as-molded layer comprises a localized buckling deformation region formed by a concentration of thermal stress;
the flattening treatment is carried out on the current forming layer to obtain a target forming layer, and the flattening treatment comprises the following steps:
and flattening the local buckling deformation area to eliminate the local buckling deformation area so as to obtain the target forming layer.
3. The method of additive manufacturing according to claim 2, wherein said step of flattening said localized warp deformation region to eliminate said localized warp deformation region to obtain a target shaped layer comprises:
and flattening the local buckling deformation area by using a roller to eliminate the local buckling deformation area so as to obtain a target forming layer.
4. The method of additive manufacturing according to claim 2, wherein said step of flattening said localized warp deformation region to eliminate said localized warp deformation region to obtain said target shaped layer comprises:
and rolling the local buckling deformation region for at least two times to eliminate the local buckling deformation region to obtain the target forming layer.
5. The method of additive manufacturing according to claim 2, wherein flattening the localized buckling region to eliminate the localized buckling region to obtain the target shaped layer comprises:
and heating the local buckling deformation area, and simultaneously performing rolling treatment to eliminate the local buckling deformation area to obtain the target forming layer.
6. The additive manufacturing method according to claim 5, wherein the heating treatment and the rolling treatment are simultaneously performed on the local buckling deformation region to eliminate the local buckling deformation region, so as to obtain the target forming layer, and the method comprises the following steps:
and flattening the local buckling deformation area by using a roller with a target temperature to eliminate the local buckling deformation area so as to obtain a target forming layer.
7. A method of additive manufacturing according to any of claims 1 to 6, wherein said step of flattening said currently formed layer to obtain a target formed layer comprises:
dividing the current shaping layer into at least two areas to be flattened;
and respectively carrying out flattening treatment on each area to be flattened to obtain the target forming layer.
8. The method of additive manufacturing of claim 7, wherein the step of sintering and melt-forming the powder layer to obtain a currently-formed layer further comprises:
and sintering, melting and forming the powder layer by using a high-energy laser beam to obtain the current forming layer.
9. The method of additive manufacturing according to claim 8, wherein the surface to be shaped is a surface of the current shaping layer or the surface to be shaped is a surface of each of the target shaping layers.
10. An additive-formed product produced by a method of additive manufacturing according to any one of claims 1 to 9.
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