CN111496252A - S L M printing method and system capable of controlling deformation of thin-wall structure - Google Patents
S L M printing method and system capable of controlling deformation of thin-wall structure Download PDFInfo
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- CN111496252A CN111496252A CN202010260685.9A CN202010260685A CN111496252A CN 111496252 A CN111496252 A CN 111496252A CN 202010260685 A CN202010260685 A CN 202010260685A CN 111496252 A CN111496252 A CN 111496252A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
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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
- B22F10/40—Structures for supporting workpieces or articles during manufacture and removed afterwards
- B22F10/47—Structures for supporting workpieces or articles during manufacture and removed afterwards characterised by structural features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
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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
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
Abstract
The invention discloses an S L M printing method and a system capable of controlling deformation of a thin-wall structure, wherein the printing method comprises the following steps of obtaining an initial three-dimensional model diagram of a workpiece to be printed to determine the thin-wall structure on the workpiece to be printed, generating a model of a support body according to the thin-wall structure, and introducing the model of the support body into the initial three-dimensional model diagram to obtain the three-dimensional model diagram of the workpiece to be printed with the support body, wherein the support body is provided with a second outer surface, the second outer surface and the first inner surface are the same in shape, gaps between the second outer surface and the first inner surface are uniformly distributed, the width of the gaps is a preset width, and the wall thickness of the support body is larger than a second preset thickness.
Description
Technical Field
The invention relates to the technical field of S L M printing, in particular to a S L M printing method and system capable of controlling deformation of a thin-wall structure.
Background
S L M (selective laser melting) is a main technical approach in metal material additive manufacturing, which selects laser as an energy source, scans layer by layer on a metal powder bed layer according to a planned path in a three-dimensional CAD slicing model, and the scanned metal powder achieves the effect of metallurgical bonding through melting and solidification to finally obtain a metal part designed by the model.
When a workpiece is printed on a thin-wall or large-size metal printing piece, a contact type supporting structure is added on the surface of the workpiece which is easy to deform, the supporting structure can be a net-shaped support or a solid support, and when the shape of the workpiece is complex, how to remove the loaded supporting structure is the greatest difficulty, the difficulty of removing the supporting structure is often even higher than that of printing the workpiece, and the application range of the S L M printing process is severely limited.
Disclosure of Invention
In view of the above, it is desirable to provide a thin-wall structure deformation control method that reduces the difficulty in removing the support structure in the thin-wall structure and improves the application range of the S L M printing process.
The invention provides an S L M printing method capable of controlling deformation of a thin-wall structure, which comprises the following steps:
s1, acquiring an initial three-dimensional model diagram of the workpiece to be printed to determine a thin-wall structure on the workpiece to be printed, wherein the wall thickness of the thin-wall structure is smaller than a first preset thickness, and the thin-wall structure is provided with a first inner surface and a first outer surface;
s2, generating a model of a support according to the thin-wall structure, and introducing the model of the support into the initial three-dimensional model map to obtain a three-dimensional model map of a workpiece to be printed with the support, wherein the support is used for supporting the thin-wall structure, the support is provided with a second outer surface, the shape of the second outer surface is the same as that of the first inner surface, the gap between the second outer surface and the first inner surface is uniformly distributed, the width of the gap is a preset width, and the wall thickness of the support is larger than a second preset thickness;
s3, guiding the three-dimensional model diagram of the workpiece to be printed with the support into an S L M printer, and printing by the S L M printer to obtain the workpiece with the support;
and S4, taking out the support in the workpiece with the support along the axial direction of the thin-wall structure to obtain the workpiece with the support removed.
The invention also provides an S L M printing system capable of controlling the deformation of the thin-wall structure, wherein the S L M printing system comprises:
the system comprises a first three-dimensional model generation module, a second three-dimensional model generation module and a third three-dimensional model generation module, wherein the first three-dimensional model generation module is used for acquiring an initial three-dimensional model diagram of a workpiece to be printed so as to determine a thin-wall structure on the workpiece to be printed, the wall thickness of the thin-wall structure is smaller than a first preset thickness, and the thin-wall structure is provided with a first inner surface and a;
a second three-dimensional model generating module, configured to generate a model of a support according to the thin-walled structure, and introduce the model of the support into the initial three-dimensional model map to obtain a three-dimensional model map of a workpiece to be printed with the support, where the support is configured to support the thin-walled structure, the support has a second outer surface, the second outer surface has a shape the same as that of the first inner surface, a gap between the second outer surface and the first inner surface is uniformly distributed, a width of the gap is a preset width, and a wall thickness of the support is greater than a second preset thickness;
the three-dimensional model importing module is used for importing a three-dimensional model drawing of a workpiece to be printed with a support into an S L M printer, and the workpiece to be printed with the support is printed by the S L M printer;
and the support stripping module is used for taking out the support in the workpiece with the support along the axial direction of the thin-wall structure so as to obtain the workpiece with the support removed.
Compared with the prior art, the technical scheme provided by the invention has the beneficial effects that the deformation of the thin-wall structure in the printing process is controlled by adopting the non-contact supporting body, the technical problem that the existing contact supporting body and the thin-wall structure are difficult to separate is solved, the removal difficulty of the supporting body is greatly reduced, and the application range of the S L M printing process is further enlarged.
Drawings
FIG. 1 is a schematic flow chart of a preferred embodiment of the S L M printing method for controlling deformation of a thin-wall structure according to the present invention;
FIG. 2 is a schematic perspective view of a workpiece to be printed;
FIG. 3 is a schematic perspective view of the print workpiece of FIG. 2 after the support is disposed;
FIG. 4 is an enlarged partial view of area A of FIG. 3;
in the figure: 1-thin-wall bent pipe, 2-supporting body and 3-reinforcing rib.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides an S L M printing method capable of controlling deformation of a thin-wall structure, including the following steps:
s1, acquiring an initial three-dimensional model diagram of the workpiece to be printed to determine a thin-wall structure on the workpiece to be printed, wherein the thickness of the thin-wall structure is smaller than a first preset thickness, and the thin-wall structure is provided with a first inner surface and a first outer surface; preferably, the first predetermined thickness is 2 mm.
Referring to fig. 2, in the embodiment, the workpiece to be printed is a thin-walled bent pipe 1, the wall thickness of the thin-walled bent pipe 1 is 1.5mm, and if the thin-walled bent pipe 1 is directly printed, the printed product is uneven due to internal thermal stress. It should be understood that although the workpiece to be printed in the present embodiment is the thin-walled bent tube 1, in other embodiments, the workpiece to be printed may have other shapes, and other embodiments obtained by merely changing the shape of the workpiece to be printed fall within the protection scope of the present invention.
S2, generating a support body model according to the thin-wall structure, introducing the support body model into the initial three-dimensional model drawing to obtain a three-dimensional model drawing of the workpiece to be printed with the support body, wherein the support body is configured to support the thin-walled structure, the support body having a second outer surface, the second outer surface and the first inner surface are the same in shape, gaps between the second outer surface and the first inner surface are uniformly distributed, and the width of each gap is a preset width, thereby not only providing support for the thin-wall structure (when in printing, the gap can be filled with metal powder, thereby indirectly providing support for the thin-wall structure), but also avoiding the adhesion of the thin-wall structure and the support body in the printing process, the thickness of the support body is larger than a second preset thickness, and the support body can be taken out from the axial direction of the thin-wall structure; preferably, the preset width is 0.1-0.5mm, and the second preset thickness is 3 mm.
Referring to fig. 3 and 4, in the present embodiment, in order to avoid the deformation phenomenon of the thin-walled elbow 1 caused by direct printing, a support body 2 is disposed in the thin-walled elbow, the outer surface of the support body 2 is in accordance with the inner surface of the thin-walled elbow 1, and the gap between the outer surface of the support body 2 and the inner surface of the thin-walled elbow 1 is uniformly distributed, and the width of the gap is 0.2 mm.
Further, referring to fig. 3 and 4, the supporting body 2 has an accommodating cavity, and a reinforcing rib 3 is disposed in the accommodating cavity, and the reinforcing rib 3 is connected to the supporting body 2, so as to increase the strength of the supporting body 2.
S3, the three-dimensional model diagram of the workpiece to be printed with the support is led into an S L M printer, and the workpiece with the support is printed by the S L M printer, so that the workpiece corresponding to the three-dimensional model diagram is printed by the S L M printer, which is the prior art and is not described in detail herein.
And S4, taking out the support in the workpiece with the support along the axial direction of the thin-wall structure to obtain the workpiece with the support removed.
Preferably, in step S2, a first connecting body and a second connecting body are respectively disposed at two ends of the supporting body, one end of the first connecting body is connected to one end surface of the thin-walled structure, the other end of the first connecting body is connected to one end surface of the supporting body, one end of the second connecting body is connected to the other end surface of the thin-walled structure, and the other end of the second connecting body is connected to the other end surface of the supporting body, so that after the first connecting body and the second connecting body are added, the deformation resistance of the thin-walled structure during printing is further enhanced;
in step S4, before the support in the support-equipped workpiece is taken out in the axial direction of the thin-walled structure, the method further includes: separating the first and second connectors from the thin-walled structure.
Preferably, the first connecting body and the second connecting body are separated from the thin-wall structure by wire cutting.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise.
The invention also provides an S L M printing system capable of controlling deformation of a thin-wall structure, which comprises a first three-dimensional model generating module, a second three-dimensional model generating module, a three-dimensional model introducing module and a support stripping module, wherein the first three-dimensional model generating module is used for obtaining an initial three-dimensional model diagram of a workpiece to be printed so as to determine the thin-wall structure on the workpiece to be printed, the wall thickness of the thin-wall structure is smaller than a first preset thickness, the thin-wall structure is provided with a first inner surface and a first outer surface, the second three-dimensional model generating module is used for generating a support model according to the thin-wall structure, the support model is introduced into the initial three-dimensional model diagram so as to obtain the three-dimensional model diagram of the workpiece to be printed with a support, the support is used for supporting the thin-wall structure, the support has a second outer surface, the second outer surface and the first inner surface are identical in shape, gaps between the second outer surface and the first inner surface are uniformly distributed, the width of the gap is a preset width, the wall thickness of the support is larger than the wall thickness of the support, the support is introduced into the support module, and the support stripping module is used for stripping module of the workpiece to remove the support from the support of the support to obtain the support from the support, and the support stripping module is used for removing the support from the printer after the three-dimensional model diagram, the three-dimensional model diagram of the workpiece.
Preferably, a first connecting body and a second connecting body are respectively arranged at two ends of the supporting body, one end of the first connecting body is connected with one end face of the thin-walled structure, the other end of the first connecting body is connected with one end face of the supporting body, one end of the second connecting body is connected with the other end face of the thin-walled structure, and the other end of the second connecting body is connected with the other end face of the supporting body.
In conclusion, the deformation of the thin-wall structure in the printing process is controlled by adopting the non-contact supporting body, the technical problem that the existing contact supporting body and the thin-wall structure are difficult to separate is solved, the difficulty in removing the supporting body is greatly reduced, and the application range of the S L M printing process is widened.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A S L M printing method capable of controlling deformation of a thin-wall structure is characterized by comprising the following steps:
s1, acquiring an initial three-dimensional model diagram of the workpiece to be printed to determine a thin-wall structure on the workpiece to be printed, wherein the wall thickness of the thin-wall structure is smaller than a first preset thickness, and the thin-wall structure is provided with a first inner surface and a first outer surface;
s2, generating a model of a support according to the thin-wall structure, and introducing the model of the support into the initial three-dimensional model map to obtain a three-dimensional model map of a workpiece to be printed with the support, wherein the support is used for supporting the thin-wall structure, the support is provided with a second outer surface, the shape of the second outer surface is the same as that of the first inner surface, the gap between the second outer surface and the first inner surface is uniformly distributed, the width of the gap is a preset width, and the wall thickness of the support is larger than a second preset thickness;
s3, guiding the three-dimensional model diagram of the workpiece to be printed with the support into an S L M printer, and printing by the S L M printer to obtain the workpiece with the support;
and S4, taking out the support in the workpiece with the support along the axial direction of the thin-wall structure to obtain the workpiece with the support removed.
2. The S L M printing method for controlling deformation of a thin-walled structure as claimed in claim 1, wherein the first predetermined thickness is 2 mm.
3. The S L M printing method for controlling deformation of a thin-walled structure as claimed in claim 1, wherein the predetermined width is 0.1-0.5 mm.
4. The S L M printing method for controlling deformation of a thin-walled structure as claimed in claim 1, wherein the second predetermined thickness is 3 mm.
5. The S L M printing method capable of controlling deformation of thin-walled structure as claimed in claim 1, wherein the supporting body has a receiving cavity, and the receiving cavity has a rib connected to the supporting body.
6. The S L M printing method for controlling deformation of a thin-walled structure as claimed in claim 1, wherein in step S2, a first connecting body and a second connecting body are respectively disposed at two ends of the supporting body, one end of the first connecting body is connected to one end face of the thin-walled structure, the other end of the first connecting body is connected to one end face of the supporting body, one end of the second connecting body is connected to the other end face of the thin-walled structure, and the other end of the second connecting body is connected to the other end face of the supporting body.
7. The S L M printing method for controlling deformation of a thin-walled structure as claimed in claim 6, wherein before the step S4 is performed, the method further comprises the step of separating the first connecting body and the second connecting body from the thin-walled structure before the support in the workpiece with the support is taken out along the axial direction of the thin-walled structure.
8. The method for S L M printing capable of controlling deformation of a thin-walled structure according to claim 7, wherein the first connecting body and the second connecting body are separated from the thin-walled structure by wire cutting.
9. An S L M printing system capable of controlling deformation of a thin-walled structure, comprising:
the system comprises a first three-dimensional model generation module, a second three-dimensional model generation module and a third three-dimensional model generation module, wherein the first three-dimensional model generation module is used for acquiring an initial three-dimensional model diagram of a workpiece to be printed so as to determine a thin-wall structure on the workpiece to be printed, the wall thickness of the thin-wall structure is smaller than a first preset thickness, and the thin-wall structure is provided with a first inner surface and a;
a second three-dimensional model generating module, configured to generate a model of a support according to the thin-walled structure, and introduce the model of the support into the initial three-dimensional model map to obtain a three-dimensional model map of a workpiece to be printed with the support, where the support is configured to support the thin-walled structure, the support has a second outer surface, the second outer surface has a shape the same as that of the first inner surface, a gap between the second outer surface and the first inner surface is uniformly distributed, a width of the gap is a preset width, and a wall thickness of the support is greater than a second preset thickness;
the three-dimensional model importing module is used for importing a three-dimensional model drawing of a workpiece to be printed with a support into an S L M printer, and the workpiece to be printed with the support is printed by the S L M printer;
and the support stripping module is used for taking out the support in the workpiece with the support along the axial direction of the thin-wall structure so as to obtain the workpiece with the support removed.
10. An S L M printing system capable of controlling deformation of a thin-walled structure according to claim 9, wherein a first connecting body and a second connecting body are respectively disposed at two ends of the supporting body, one end of the first connecting body is connected to one end face of the thin-walled structure, the other end of the first connecting body is connected to one end face of the supporting body, one end of the second connecting body is connected to the other end face of the thin-walled structure, and the other end of the second connecting body is connected to the other end face of the supporting body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010260685.9A CN111496252A (en) | 2020-04-03 | 2020-04-03 | S L M printing method and system capable of controlling deformation of thin-wall structure |
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| CN202010260685.9A CN111496252A (en) | 2020-04-03 | 2020-04-03 | S L M printing method and system capable of controlling deformation of thin-wall structure |
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| CN116275118A (en) * | 2023-05-16 | 2023-06-23 | 中国科学院长春光学精密机械与物理研究所 | Thin-wall cavity supporting structure based on laser material-increasing technology |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114273675A (en) * | 2021-12-28 | 2022-04-05 | 北京星航机电装备有限公司 | Additive manufacturing method adopting non-contact dimensional shape |
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| CN116275118A (en) * | 2023-05-16 | 2023-06-23 | 中国科学院长春光学精密机械与物理研究所 | Thin-wall cavity supporting structure based on laser material-increasing technology |
| CN116275118B (en) * | 2023-05-16 | 2023-08-08 | 中国科学院长春光学精密机械与物理研究所 | Thin-wall cavity supporting structure based on laser material-increasing technology |
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Inventor after: Jiang Xiaodong Inventor after: Hong Tan Inventor after: Ye Junxiang Inventor before: Will the dawn of winter Inventor before: Hong Tan Inventor before: Ye Junxiang |
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Application publication date: 20200807 |