CN109332692B - Auxiliary supporting structure for selective laser melting forming of suspended surface and application method thereof - Google Patents

Auxiliary supporting structure for selective laser melting forming of suspended surface and application method thereof Download PDF

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CN109332692B
CN109332692B CN201811313070.7A CN201811313070A CN109332692B CN 109332692 B CN109332692 B CN 109332692B CN 201811313070 A CN201811313070 A CN 201811313070A CN 109332692 B CN109332692 B CN 109332692B
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supporting
suspension
auxiliary
product
plane
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CN109332692A (en
Inventor
田彩兰
赵衍华
严振宇
董鹏
何京文
梁晓康
朱瑞灿
李德成
周庆军
宋全
金盈池
彭深沉
张朋旭
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China Academy of Launch Vehicle Technology CALT
Capital Aerospace Machinery Co Ltd
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China Academy of Launch Vehicle Technology CALT
Capital Aerospace Machinery Co Ltd
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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]
    • 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
    • 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
    • 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
    • B22F12/46—Radiation means with translatory movement
    • B22F12/47—Radiation means with translatory movement parallel to the deposition plane
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Laser Beam Processing (AREA)

Abstract

The invention discloses an auxiliary supporting structure for a laser selective melting forming suspended surface and an application method thereof, and belongs to the technical field of additive manufacturing. The auxiliary supporting structure comprises at least one supporting block, the supporting block is provided with a first supporting surface, a second supporting surface and a suspension plane, the first supporting surface is used for being connected with the suspension surface of a product to support the suspension surface, the second supporting surface is used for being connected with the inner side surface of the product, and the plane of the suspension plane is intersected with the first supporting surface and the second supporting surface. By arranging the suspended plane, the volume of the supporting structure can be reduced by more than 40%, the forming time of the auxiliary support and the use amount of raw materials are reduced, and the production cost is saved; meanwhile, the auxiliary supporting structure provided by the invention obviously reduces the occurrence probability of local cracking, collapse and other phenomena in the forming process, greatly reduces the probability of warping, deformation and other phenomena in the product forming process, and improves the qualification rate of products.

Description

Auxiliary supporting structure for selective laser melting forming of suspended surface and application method thereof
Technical Field
The invention relates to an auxiliary supporting structure for a selective laser melting forming suspended surface and an application method thereof, belonging to the technical field of additive manufacturing.
Background
A selective laser melting forming technology (SLM for short) belongs to the field of metal additive manufacturing, and is a digital high-precision rapid manufacturing technology which is rapidly developed in the last decade. The technology converts a three-dimensional digital model into a two-dimensional graphic profile with the same slice thickness through laser layer-by-layer scanning, and the two-dimensional graphic profile is deposited layer-by-layer to form a product with the same structure as the three-dimensional model.
The stability and the dimensional accuracy of the laser selective melting forming process of the product are closely related to the complexity of the product. For a product with a simple structure, the forming requirement of the product can be met through the adjustment of the placing posture of the three-dimensional model during the processing of the three-dimensional model. For a product with a complex structure, after the three-dimensional model posture is adjusted during SLM forming, the product still has a suspended surface (as shown in fig. 1), the suspended surface includes a horizontal suspended surface, a nearly horizontal suspended surface, an arc suspended surface, and the like, and before SLM forming, auxiliary support needs to be added to the suspended surface to realize forming of the suspended surface.
At present, as shown in fig. 2, the auxiliary support is usually formed together with the product entity during forming, so that the existing auxiliary support is filled in a cavity formed by the suspended surface, the side surface and the bottom surface of the product, the bottom of the auxiliary support structure is connected with the formed bottom surface, the top of the auxiliary support structure is connected with the suspended surface, a gap is formed between the side wall and the side wall of the product, and after the product is formed, the support is removed by machining, manual operation and the like, so that the product can be obtained.
The conventional auxiliary support penetrates between the suspended surface and the bottom surface of a product, so that the size and the weight of the auxiliary support are large. The resistance of the large-volume auxiliary support to the powder spreading scraper is large, and the reaction force (shearing force) of the powder spreading scraper to the auxiliary support is also large; particularly, when the support has a certain height, the shear resistance of the support is obviously reduced, so that the forming process is more unstable; meanwhile, the auxiliary support material has more defects and relatively low strength, and when the powder paving scraper passes through the upper part of the auxiliary support, the support is easy to crack and collapse under the double actions of shearing force and pressure. After the auxiliary support is locally cracked and collapsed, the suspended part is easy to have the phenomena of rough surface and serious slag adhering under the condition of not influencing the continuous forming of products, and the size precision of the formed products is influenced; in severe cases, local warping and blade jamming of the product occur, which results in failure of SLM formation due to the fact that the product cannot be continuously formed. In addition, forming bulky secondary supports takes considerable forming time, resulting in wasted time and raw materials.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an auxiliary supporting structure for a laser selective melting forming suspension surface and an application method thereof, wherein the volume of the supporting structure can be reduced by more than 40% by arranging the suspension plane, the forming time of the auxiliary support and the use amount of raw materials are reduced, and the production cost is saved; meanwhile, the auxiliary supporting structure provided by the invention obviously reduces the occurrence probability of local cracking, collapse and other phenomena in the forming process, greatly reduces the probability of warping, deformation and other phenomena in the product forming process, and improves the qualification rate of products.
In order to achieve the above purpose, the invention provides the following technical scheme:
an auxiliary supporting structure for selective laser melting forming comprises at least one supporting block, wherein the supporting block is provided with a first supporting surface, a second supporting surface and a suspension plane, the first supporting surface is used for being connected with the suspension plane of a product to support the suspension plane, the second supporting surface is used for being connected with the inner side surface of the product, and the plane of the suspension plane is intersected with the first supporting surface and the second supporting surface.
In an optional embodiment, the included angle between the suspension plane and the vertical plane is-45 degrees to 45 degrees.
In an alternative embodiment, the auxiliary supporting structure for selective laser melting forming comprises at least two supporting blocks, and first supporting surfaces of the at least two supporting blocks are connected with each other and used for supporting the suspended surface together.
In an alternative embodiment, the support block is further provided with an abutment surface, which is parallel to the vertical plane.
In an optional embodiment, the included angle between the suspension plane and the vertical plane is-60 ° to-45 ° or 45 ° to 60 °, the auxiliary support structure further includes a support pillar, the pillar is configured to be supported between the suspension plane and the bottom surface of the product, and an upper surface of the pillar is connected to the at least two first support surfaces, and supports the suspension plane together with the at least two first support surfaces.
In an alternative embodiment, the auxiliary support structure for selective laser melting forming is a grid-type support structure.
In an optional embodiment, the grid-type supporting structure comprises a plurality of rows and a plurality of columns of grids, the side length of each grid is 5-10 mm, the side length of each grid forming the grid is 0.5-1 mm, and the distance between every two adjacent grids is 0.3-0.8 mm.
A product system formed by selective laser melting comprises products formed by selective laser melting, wherein the products comprise side walls, a suspension surface erected between the side walls and the auxiliary supporting structure.
A method of applying an auxiliary support structure, comprising the steps of:
(1) determining an auxiliary support structure according to the design structure and the size of a product to be formed, wherein the auxiliary support structure is provided by the scheme;
(2) and obtaining a product system with the auxiliary supporting structure through selective laser melting forming.
In an alternative embodiment, the step (1) of determining the auxiliary supporting structure according to the design structure and the size of the product to be formed includes:
when the aspect ratio of the envelope size of the suspension surface is less than 5:1, the auxiliary support structure comprises one support block.
In an alternative embodiment, the step (1) of determining the auxiliary supporting structure according to the design structure and the size of the product to be formed includes:
dividing the suspended surface into at least two sub-regions according to the structure and the area of the suspended surface of the product to be formed, wherein the auxiliary supporting structure comprises at least two supporting blocks, and the supporting blocks correspond to the sub-regions one by one.
In an optional embodiment, the dividing the suspended surface into at least two sub-regions according to the structure and area of the suspended surface of the product to be formed comprises:
when the ratio of the maximum side length to the minimum side length of the enveloping dimension of the suspension surface is 5: 1-15: 1, dividing the suspension surface into two sub-areas; or when the ratio of the maximum side length to the minimum side length of the envelope size of the suspension surface is more than 15: 1, dividing the suspension surface into at least three subregions.
In an alternative embodiment, the method for applying an auxiliary support structure for selective laser melting forming further includes:
when the envelope area of the suspension surface is more than or equal to 2500mm2And when the supporting block is used, the supporting block is also provided with a butt joint surface, and the butt joint surface is parallel to the vertical plane.
In an alternative embodiment, the method for applying an auxiliary support structure for selective laser melting forming further includes:
when the envelope shape of the suspension surface is a geometrically symmetric figure, dividing sub-regions according to a symmetry principle; or
And when the envelope shape of the suspension surface is an asymmetric figure, dividing the sub-regions according to the principle that the areas are equal or close.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the auxiliary supporting structure for selective laser melting forming, the volume of the supporting structure can be reduced by more than 40% by arranging the suspension plane, the forming time of the auxiliary support and the use amount of raw materials are reduced, and the production cost is saved; meanwhile, the auxiliary supporting structure provided by the invention obviously reduces the occurrence probability of local cracking, collapse and other phenomena in the forming process, greatly reduces the probability of warping, deformation and other phenomena in the product forming process, and improves the qualification rate of products;
(2) the included angle between the suspended plane and the vertical plane is designed to be-45 degrees, so that the suspended plane is ensured to be smoothly formed, the supporting strength is ensured, and the volume of the supporting structure can be reduced by more than 50 percent;
(3) the included angle between the suspended plane and the vertical plane is designed to be-60 degrees to-45 degrees or 45 degrees to 60 degrees, and the supporting upright columns are arranged, so that the supporting strength is ensured, and the suspended plane is ensured to be formed smoothly;
(4) the auxiliary supporting structure provided by the embodiment of the invention can ensure effective supporting, reduce the residual quantity of the powder in the supporting part in the forming process and reduce the forming time.
Drawings
FIG. 1 is a schematic view of various sides of a laser selective melting formed product;
FIG. 2 is a schematic view of a laser selective melt formed product and its combination with a conventional auxiliary support structure;
FIG. 3 is a schematic view of a combination of an auxiliary support structure for selective laser melting and forming and a product according to an embodiment of the present invention;
FIG. 4 is a schematic view of another auxiliary support structure for selective laser melting and forming in combination with a product according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a grid-like supporting structure according to an embodiment of the present invention;
FIG. 6 is a schematic view of another auxiliary support structure for selective laser melting and forming in combination with a product according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a sub-region segmentation method according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention will be made with reference to the accompanying drawings and specific examples.
Referring to fig. 3, an auxiliary supporting structure for selective laser melting forming is provided in an embodiment of the present invention, and includes at least one supporting block 1, where the supporting block 1 is provided with a first supporting surface 11, a second supporting surface 12, and a suspending plane 13, the first supporting surface 11 is used for being connected to a suspending surface of a product to support the suspending surface, the second supporting surface 12 is used for being connected to an inner side surface of the product, and a plane of the suspending plane 13 intersects with the first supporting surface 11 and the second supporting surface 12.
Specifically, the auxiliary support structure provided by the embodiment of the invention is subjected to selective laser melting forming together with the product, and the product is removed by machining after forming to obtain the product.
According to the auxiliary supporting structure for selective laser melting forming, the volume of the supporting structure can be reduced by more than 40% by arranging the suspension plane, the forming time of the auxiliary support and the use amount of raw materials are reduced, and the production cost is saved; meanwhile, the auxiliary supporting structure provided by the invention obviously reduces the occurrence probability of local cracking, collapse and other phenomena in the forming process, greatly reduces the probability of warping, deformation and other phenomena in the product forming process, and improves the qualification rate of products.
In an optional embodiment, the included angle between the suspension plane 13 and the vertical plane is-45 ° to 45 °. The included angle between the suspended plane and the vertical plane is designed to be-45 degrees, so that the suspended plane is ensured to be smoothly formed, the supporting strength is ensured, and the volume of the supporting structure can be reduced by more than 50 percent.
In an alternative embodiment, as shown in b in fig. 3, the auxiliary supporting structure for selective laser melting includes two supporting blocks 1, the first supporting surfaces 11 of the two supporting blocks 1 are connected to jointly support the suspended surface, an included angle α between the suspended plane 13 of one supporting block 1 and the vertical horizontal plane is-45 ° to 45 °, an included angle β between the other supporting block 1 and the vertical horizontal plane is-45 ° to 45 °, and α and β may be the same or different. By arranging at least two supporting blocks 1, the large-size suspended surface can be effectively supported, the size of the supporting structure is further reduced, and the stability of the forming process can be improved.
Referring to fig. 4, in an alternative embodiment, the support block 1 is further provided with an abutment surface, the abutment surface 14 being parallel to a vertical plane. The vertical butt joint surface 14 is beneficial to increasing heat conduction, improving the stability of the forming process and improving the product percent of pass.
In an alternative embodiment, the auxiliary support structure for selective laser melting forming is a grid-type support structure. The grid type auxiliary supporting structure is easy to remove, and after the procedures of manual removal, grinding and sand blowing, the surface quality of the suspended surface is excellent and can generally meet the requirement of direct use. In an alternative embodiment, as shown in fig. 5, the grid-like supporting structure includes a plurality of rows and columns of grids a, each grid has a side length of 5-10 mm, a grid b forming the grid has a side length of 0.5-1 mm, and a distance d between two adjacent grids is 0.3-0.8 mm. The grid type auxiliary supporting structure can ensure effective supporting, reduce the residual quantity of the powder in the supporting part in the forming process and reduce the forming time.
In another alternative embodiment, the auxiliary support structure may also be a solid structure or a solid and grid combined structure.
Referring to fig. 6, another auxiliary support structure for selective laser melting forming is provided in an embodiment of the present invention, which includes a support column 2 and at least two support blocks 1, the supporting block 1 is provided with a first supporting surface 11, a second supporting surface 12 and a suspension plane 13, the first supporting surface 11 is used for being connected with a suspension surface of a product to support part of the suspension surface, the second supporting surface 12 is used for connecting with the inner side surface of the product, the plane of the suspension plane 13 is intersected with the first supporting surface 11 and the second supporting surface 12, the included angle alpha between the suspension plane 13 of one supporting block 1 and the vertical horizontal plane is-60 degrees to-45 degrees or 45-60 degrees, the included angle beta between the other supporting block 1 and the vertical horizontal plane is also-60 degrees to-45 degrees or 45-60 degrees, and the alpha and the beta can be the same or different; the first supporting surfaces 11 of the at least two supporting blocks 1 are connected, the upright column 2 is used for being supported between the suspension surface and the forming bottom surface of the product, the upper surface of the upright column 2 is an upright column supporting surface 21 and is positioned at the central part of the suspension surface, so that the upright column supporting surface 21 is connected with the first supporting surfaces 11 of the at least two supporting blocks, and the three support the suspension surface together.
In particular, in the present embodiment, the second support surface 12 can be connected to either or both of the adjacent side surfaces, preferably the side surfaces that are vertically downward or that extend toward the interior of the cavity.
According to the auxiliary supporting structure for selective laser melting forming, the supporting block is provided with the suspended plane, so that the volume of the supporting structure can be reduced by more than 40%, the forming time of the auxiliary support and the use amount of raw materials are reduced, and the production cost is saved; meanwhile, the auxiliary supporting structure provided by the invention obviously reduces the occurrence probability of local cracking, collapse and other phenomena in the forming process, greatly reduces the probability of warping, deformation and other phenomena in the product forming process, and improves the qualification rate of products. The included angle between the suspended plane and the vertical plane is designed to be-60 degrees to-45 degrees or 45 degrees to 60 degrees, and the supporting upright columns are arranged, so that the supporting strength is ensured, and the suspended plane is ensured to be formed smoothly.
As shown in fig. 3, an embodiment of the present invention further provides a product system formed by selective laser melting, including a product formed by selective laser melting, where the product includes sidewalls and a suspension surface erected between the sidewalls, and an auxiliary support structure provided by the above-mentioned embodiment of the auxiliary support structure.
For the description and effects of the auxiliary supporting structure, reference is made to the above-mentioned embodiments of the supporting structure, which are not described herein again.
The embodiment of the invention also provides an application method of the auxiliary support structure for selective laser melting forming, which comprises the following steps:
(1) determining an auxiliary support structure according to the design structure and the size of a product to be formed, wherein the auxiliary support structure is provided by the auxiliary support structure embodiment;
(2) and obtaining a product system with the auxiliary supporting structure through selective laser melting forming.
For the description and effects of the auxiliary supporting structure, reference is made to the above-mentioned embodiments of the supporting structure, and further description is omitted here.
In an alternative embodiment, the step (1) of determining the auxiliary supporting structure according to the design structure and the size of the product to be formed includes:
when the length-width ratio of the envelope size of the suspension surface is less than 5:1 and the suspension area is not more than 500mm2The auxiliary support structure comprises one of the support blocks 1.
Specifically, in the embodiment of the present invention, the envelope size refers to an outer contour size when the suspension surface is a plane, and the envelope size refers to an outer contour size of an outer contour mapped on the forming bottom surface when the suspension surface is an irregular arc-shaped surface or a curved surface.
For the description and effects of the auxiliary supporting structure, reference is made to the above-mentioned embodiments of the supporting structure, and further description is omitted here.
In an alternative embodiment, the step (1) of determining the auxiliary supporting structure according to the design structure and the size of the product to be formed includes:
dividing the suspended surface of the product to be formed into at least two sub-regions according to the structure and the area of the suspended surface, wherein the auxiliary supporting structure comprises at least two supporting blocks 1, and the supporting blocks 1 correspond to the sub-regions one by one.
In an optional embodiment, dividing the overhanging surface of the product to be formed into at least two sub-regions according to the structure and area of the overhanging surface comprises:
when the ratio of the maximum side length to the minimum side length of the enveloping dimension of the suspension surface is 5: 1-15: 1, and the suspended area is not more than 1000mm2When the suspension surface is divided into two sub-areas; or when the ratio of the maximum side length to the minimum side length of the envelope size of the suspension surface is more than 15: 1, and the suspended area is more than 1500mm2The suspension surface is then divided into at least three sub-regions.
In an alternative embodiment, as shown in fig. 7, for a suspension plane having an envelope shape with a geometric center of symmetry or a center of approximate symmetry, the subintervals are divided according to the symmetry principle (as shown in a, c, d, and e in fig. 7). When the envelope shape of the suspension surface is an asymmetric figure, the sub-regions are divided according to the principle of equal or similar areas (as shown in b in fig. 7).
The sub-area dividing method can reduce the volume of the auxiliary support to the maximum extent and meanwhile strengthen the fixed connection between the auxiliary support and the side wall.
In an alternative embodiment, the method for applying an auxiliary support structure for selective laser melting forming further includes:
when the envelope area of the suspension surface is more than or equal to 2500mm2The support block 1 is also provided with an abutment surface 14, which is parallel to the vertical plane.
When the envelope area of the suspension surface is more than or equal to 2500mm2When the heat conduction of the support is poor, the top of the suspension surface is hung with slag and collapses, the forming quality is seriously affected, and the setting and the effect of the butt joint surface are referred to the embodiment of the support structure, so that the repeated description is omitted.
The above description is only one embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
The invention has not been described in detail in part of the common general knowledge of those skilled in the art.

Claims (7)

1. An auxiliary supporting structure for selective laser melting forming is characterized by comprising a supporting block, wherein the supporting block is provided with a first supporting surface, a second supporting surface and a suspension plane, the first supporting surface is used for being connected with the suspension plane of a product to support the suspension plane, the second supporting surface is used for being connected with the inner side surface of the product, and the plane of the suspension plane is intersected with the first supporting surface and the second supporting surface;
the auxiliary supporting structure for selective laser melting forming comprises at least two supporting blocks, wherein first supporting surfaces of the at least two supporting blocks are connected and used for supporting the suspended surface together; the supporting block is also provided with a butt joint surface, and the butt joint surface is parallel to a vertical plane;
the auxiliary supporting structure further comprises a supporting upright post, the upright post is used for being supported between the suspended surface and the forming bottom surface of the product, and the upper surface of the upright post is connected with the at least two first supporting surfaces and supports the suspended surface together with the at least two first supporting surfaces.
2. An auxiliary support structure for selective laser melting forming as claimed in claim 1, wherein the angle between the suspended plane and the vertical plane is-45 ° to 45 °.
3. The auxiliary support structure for selective laser melting forming of claim 1, wherein the included angle between the suspended plane and the vertical plane is-60 ° to-45 ° or 45 ° to 60 °.
4. An auxiliary support structure for selective laser melting shaping according to any one of claims 1-3, wherein the auxiliary support structure is a mesh-like support structure.
5. The auxiliary support structure for selective laser melting forming of claim 4, wherein the grid-like support structure comprises a plurality of rows and columns of grids, each grid has a side length of 5-10 mm, the grid sides forming the grids are 0.5-1 mm, and the distance between two adjacent grids is 0.3-0.8 mm.
6. A laser selective melt formed product system comprising laser selective melt formed products including sidewalls and a suspended surface spanning between the sidewalls, further comprising an auxiliary support structure according to any of claims 1 to 5.
7. An application method of an auxiliary support structure is characterized by comprising the following steps:
(1) determining an auxiliary support structure according to the design structure and the size of a product to be formed, wherein the auxiliary support structure is provided by any one of claims 1-6;
(2) obtaining a product system with the auxiliary supporting structure through selective laser melting forming;
determining an auxiliary supporting structure according to the design structure and the size of the product to be formed in the step (1), wherein the auxiliary supporting structure comprises:
dividing the suspended surface into at least two sub-regions according to the structure and the area of the suspended surface of the product to be formed, wherein the auxiliary supporting structure comprises at least two supporting blocks, and the supporting blocks correspond to the sub-regions one by one;
the dividing of the overhanging surface into at least two sub-regions according to the structure and area of the overhanging surface of the product to be formed comprises:
when the ratio of the maximum side length to the minimum side length of the enveloping dimension of the suspension surface is 5: 1-15: 1, dividing the suspension surface into two sub-areas; or when the ratio of the maximum side length to the minimum side length of the envelope size of the suspension surface is more than 15: 1, dividing the suspension surface into at least three subregions;
when saidThe envelope area of the suspension surface is more than or equal to 2500mm2When the supporting block is used, the supporting block is also provided with a butt joint surface, and the butt joint surface is parallel to a vertical plane;
when the envelope shape of the suspension surface is a geometrically symmetric figure, dividing sub-regions according to a symmetry principle; or
And when the envelope shape of the suspension surface is an asymmetric figure, dividing the sub-regions according to the principle that the areas are equal or close.
CN201811313070.7A 2018-11-06 2018-11-06 Auxiliary supporting structure for selective laser melting forming of suspended surface and application method thereof Active CN109332692B (en)

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