An additive manufacturing substrate and method of manufacture, additive manufacturing platform

Abstract

The application provides an additive manufacturing substrate and a preparation method and an additive manufacturing platform, and relates to the technical field of additive manufacturing, and aims to solve the technical problem of high manufacturing cost of additive manufacturing substrate materials. The additive manufacturing substrate preparation method comprises the following steps: obtaining a second contour structure of the bottom of a structural part; determining a first contour structure of the substrate according to the second contour structure, wherein the first contour structure is matched with the second contour structure; based on the principle of minimum feeding, the substrate is divided into N subsegments, the subsegment has at least one groove and at least one protrusion, the protrusion of one subsegment is matched with the groove of the adjacent other subsegment, and the protrusion and the corresponding groove are matched in a clearance fit; or the matching between the protrusion and the corresponding groove is a mortise-and-tenon structure matching; wherein N is greater than or equal to 2. The additive manufacturing substrate is used for large-format structural part additive manufacturing substrates, and the preparation method of the substrate adopts a segmented mode, so that the material of the substrate used for additive manufacturing is minimized, and feeding is saved.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and in particular to an additive manufacturing substrate and its preparation method, as well as an additive manufacturing platform. Background Technology

[0002] Additive manufacturing is a rapidly developing manufacturing technology in recent years. It is driven by digital models and obtains processing programs through layer slicing, path planning and other methods. It directly forms structural parts by adding materials layer by layer, and has advantages such as no need for molds, high efficiency and low development cost.

[0003] Additive manufacturing is a continuous process involving a large amount of heat input. In related technologies, for additive manufacturing of large-format structural components, such as structural components with a bottom profile exceeding 1m×1m, large-format substrates are usually used. However, the substrates are difficult to reuse after deformation due to the large amount of heat input, and the substrate material manufacturing cost is high. Summary of the Invention

[0004] The purpose of this invention is to provide an additive manufacturing substrate and its preparation method, as well as an additive manufacturing platform, to solve the technical problem of high manufacturing cost of additive manufacturing substrate materials.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a method for preparing an additive manufacturing substrate, the substrate being used for additive manufacturing of large-format structural components, the preparation method comprising:

[0007] Obtain the second contour structure of the bottom of the structural component;

[0008] Based on the second contour structure, a first contour structure of the substrate is determined, wherein the first contour structure is adapted to the second contour structure;

[0009] Based on the principle of minimizing material input, the substrate is divided into N sub-segments. Each sub-segment has at least one groove and at least one protrusion. The protrusion of one sub-segment is adapted to the groove of an adjacent sub-segment, and the protrusion is clearance-fitted with the corresponding groove; or, the fit between the protrusion and the corresponding groove is a mortise and tenon joint.

[0010] Where N≥2.

[0011] According to at least one embodiment of the present invention, determining the first contour structure of the substrate based on the second contour structure includes:

[0012] The second contour structure has an inner side and an outer side. The first contour structure of the substrate is determined by offsetting the second contour structure inward and outward by a preset distance.

[0013] According to at least one embodiment of the present invention, the preset distance is 50mm to 100mm.

[0014] According to at least one embodiment of the present invention, after determining the first contour structure of the substrate based on the second contour structure, the fabrication method further includes:

[0015] The thickness of the substrate is determined based on the shape of the first contour structure of the substrate.

[0016] According to at least one embodiment of the present invention, the thickness of the substrate is 10 mm to 30 mm.

[0017] According to at least one embodiment of the present invention, the groove is shaped as a spherical crown, an ellipse, a polygon, or a wedge.

[0018] According to at least one embodiment of the present invention, dividing the substrate into N sub-segments based on the principle of minimizing material input includes:

[0019] When the second contour structure is a second ring structure, the first contour structure of the substrate is a first ring structure adapted to the second ring structure; the substrate is divided into N equal sub-segments, and the sub-segments are fan-shaped ring plates.

[0020] According to at least one embodiment of the present invention, dividing the substrate into N sub-segments based on the principle of minimizing material input includes:

[0021] When the second contour structure is a second linear frame structure composed of M linear frame segments, the first contour structure of the substrate is a first linear frame structure adapted to the second linear frame structure; the substrate is divided into N second rectangular plates corresponding to the linear frame segments, and the sub-segment is a second rectangular plate, where N = M.

[0022] According to at least one embodiment of the present invention, when the protrusion and the corresponding groove are in clearance fit, the gap between the outer wall surface of the protrusion and the inner wall surface of the groove is 0.5 mm to 1 mm.

[0023] According to at least one embodiment of the present invention, the outer radius of the first annular structure is m and the inner radius is n; the outer radius of the second annular structure is R and the inner radius is r; wherein, m = R + p, n = rp, and p is 50 mm to 100 mm.

[0024] According to at least one embodiment of the present invention, the fan ring plate is a plate cut from a first rectangular plate, and the number of fan ring plates N = [X], where X satisfies:

[0025]

[0026] Wherein, S3 is the area of ​​all the first rectangular plates; b and c are the minimum distances between the fan ring plate and the two adjacent sides of the first rectangular plates, and b and c are fixed values; X is a variable; when a whole square plate is used as the substrate, a is the distance between the boundary of the square plate 50 and the structural member 30.

[0027] According to at least one embodiment of the present invention, the thickness of the substrate is h, where h:p = (1~3):(5~10).

[0028] In a second aspect, the present invention provides an additive manufacturing substrate, which is prepared by the substrate preparation method described in the first aspect.

[0029] Thirdly, the present invention provides an additive manufacturing platform, including a working platform and the additive manufacturing substrate described in the second aspect;

[0030] The substrate has N sub-segments, each sub-segment having at least one through hole for a bolt to pass through, the through hole being used to screw the corresponding sub-segment to the work platform via the bolt.

[0031] In one or more technical solutions provided in the exemplary embodiments of the present invention, at least one of the following beneficial effects can be achieved.

[0032] This invention discloses an additive manufacturing substrate manufacturing method in an exemplary embodiment. The substrate is used for additive manufacturing of large-format structural components. By determining a first contour structure of the substrate adapted to the second contour structure of the bottom of the structural component, the substrate is divided into N sub-segments, where N≥2. Each sub-segment is connected by mutually cooperating protrusions and grooves, such as clearance fits or mortise and tenon joints. Compared to using a single large-format substrate, this exemplary embodiment of the additive manufacturing substrate manufacturing method uses a slot-type splicing method for each sub-segment. This allows the sub-segments to be designed as universal standard parts, suitable for serialized products; alternatively, they can be designed according to the specific shape of the structural component. For example, the overall contour shape of the substrate can be designed according to the bottom shape of the structural component, suitable for customized products. Therefore, by dividing the substrate into N sub-segments, the material used for additive manufacturing of the substrate can be minimized, saving material input.

[0033] Furthermore, by using slot-type splicing for each segment and leaving gaps between the protrusions and grooves, the reliable installation of the substrate is ensured and it plays a positioning role. At the same time, the deformation can be offset as much as possible in the gaps between the protrusions and grooves of each segment. This avoids large deformation caused by the cumulative stress of a large substrate, which cannot be reused, resulting in waste of substrate material and increasing the additive manufacturing cost and cycle of large-size, large-format metal structural components.

[0034] Furthermore, when each segment is spliced ​​using a slot-type joint, and the fit between the protrusion and the corresponding groove is a mortise and tenon structure, since the mortise and tenon structure can not only withstand a large load, but also allow for a certain degree of deformation, under thermal stress load, a certain amount of stress energy can be offset by deformation, reducing the substrate's response to thermal stress, and reducing the possibility of severe warping deformation relative to a large-format substrate. Attached Figure Description

[0035] The accompanying drawings illustrate exemplary embodiments of the invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification.

[0036] Figure 1 This is a schematic flowchart of an additive manufacturing substrate preparation method according to an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of an additive manufacturing substrate structure according to an embodiment of the present invention;

[0038] Figure 3 This is a top view schematic diagram of an additive manufacturing substrate according to an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of a fan-ring plate structure according to an embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of a solid square plate structure according to an embodiment of the present invention;

[0041] Figure 6 This is a schematic diagram of the first rectangular plate structure according to an embodiment of the present invention;

[0042] Figure 7 This is a schematic diagram of an additive manufacturing substrate structure according to another embodiment of the present invention;

[0043] Figure 8 This is a top view of an additive manufacturing substrate according to another embodiment of the present invention;

[0044] Figure 9 This is a schematic diagram of the second rectangular plate structure according to an embodiment of the present invention.

[0045] Reference numerals: 10, substrate; 11a, fan ring plate; 11b, second rectangular plate; 111, protrusion; 112, groove; 12, through hole; 13, second side surface; 20, working platform; 30, structural component; 31, first side surface; 40, first rectangular plate; 50, square plate. Detailed Implementation

[0046] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in 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 present invention and are not intended to limit the present invention.

[0047] Additive manufacturing is a continuous process involving a large amount of heat input, which inevitably creates significant internal stress, leading to deformation and cracking of structural components. This is especially true for additive manufacturing of large-format structural components, where a large amount of heat accumulates on the substrate, causing severe warping and deformation, and even cracking at the connection between the structural component and the substrate. This results in product scrap and disrupts the additive manufacturing process. Furthermore, the use of a single, large-format substrate leads to high manufacturing costs.

[0048] To address the aforementioned problems, the exemplary embodiment of this invention provides a substrate preparation method for additive manufacturing of large-format structural components. This method involves forming the substrate from multiple segments, with each segment connected via a combination of protrusions and grooves. This ensures accurate substrate positioning while allowing for the adaptation to deformation through the interlocking mechanism, thereby mitigating thermal stress caused by the heat generated during additive manufacturing and ensuring the smooth progress of the additive manufacturing process. Furthermore, by dividing the substrate into N segments based on the principle of minimizing material input, the manufacturing cost of the substrate is reduced.

[0049] It should be noted that the additive manufacturing process refers to any additive manufacturing process of the direct energy deposition type, such as arc additive manufacturing, laser direct melting additive manufacturing, etc., which is only illustrative and should not be construed as a limitation on the embodiments of the present invention. For example, in order to accommodate the thermal stress deformation caused by heat accumulation and to ensure a certain strength, the substrate can be made of various metal materials such as aluminum alloy, steel, and titanium alloy.

[0050] Figure 1 This is a schematic flowchart of an additive manufacturing substrate preparation method according to an embodiment of the present invention. Figure 1 As shown, the additive manufacturing substrate preparation method of the exemplary embodiment of the present invention is applicable to substrates required for additive manufacturing of large-format structural parts, such as structural parts with a bottom area of ​​not less than 1m × 1m.

[0051] Step 101: Obtain the second contour structure of the bottom of the structural component.

[0052] The bottom of the additively manufactured structural component can be a circular second ring structure or a second linear frame structure composed of M linear frame segments, such as a grid-shaped second linear frame structure.

[0053] Step 102: Determine the first contour structure of the substrate based on the second contour structure, wherein the first contour structure is adapted to the second contour structure.

[0054] When the bottom of the structural component is a circular second annular structure, the first contour structure of the substrate is a first annular structure adapted to the second annular structure. For example, the second annular structure has opposing inner and outer sides. The first annular structure is obtained by offsetting the second annular structure inward and outward by a predetermined distance, where the predetermined distance can be 50mm to 100mm.

[0055] When the bottom of the structural component is a second linear frame structure composed of M linear frame segments, the substrate is a first linear frame structure adapted to the second linear frame structure. For example, each linear frame segment has a relative inner side and an outer side, and the linear frame segments are offset inward and outward by a preset distance to obtain the first linear frame structure. The preset distance can be 50mm to 100mm.

[0056] In some embodiments, after determining the first contour structure of the substrate, the substrate fabrication method further includes: determining the thickness of the substrate based on the shape of the first contour structure of the substrate. For example, the ratio of the substrate thickness to a preset distance is (1-3):(5-10), for instance, the substrate thickness is 10 mm to 30 mm.

[0057] Step 103: Based on the principle of minimizing material input, the substrate is divided into N sub-segments. Each sub-segment has at least one groove and at least one protrusion. The protrusion of one sub-segment is adapted to the groove of the adjacent sub-segment, and the protrusion and the corresponding groove are in clearance fit; or, the fit between the protrusion and the corresponding groove is a mortise and tenon structure fit, where N≥2.

[0058] Multiple segments can be used to process their surfaces and then reuse them. For example, structural parts with similar diameters can be reused. This is suitable for serialized products. For example, in the additive manufacturing of the same type of cabin product in the aerospace field, the cabin products are basically the same or similar in diameter, but different in height.

[0059] By way of example, the protrusions and grooves in the substrate of the exemplary embodiment of the present invention can be rectangular, spherical, elliptical, etc., or other polygons, such as triangles, wedges, etc.

[0060] The following describes in further detail the method for preparing an additive manufacturing substrate according to an exemplary embodiment of the present invention, using two specific embodiments.

[0061] When the first contour structure of the substrate is a first annular structure, the substrate is divided into N equal sub-segments, wherein each sub-segment is a fan-shaped ring plate.

[0062] Figure 2 This is a schematic diagram of an additive manufacturing substrate structure according to an embodiment of the present invention. Figure 2As shown, the bottom of the large-format structural component 30 is a circular second annular structure, and the substrate 10 is a first annular structure adapted to the second annular structure. The bottom of the large-format structural component 30 is disposed on the substrate 10, that is, the second annular structure is made by additive manufacturing above the first annular structure.

[0063] Figure 3 This is a top view schematic diagram of an additive manufacturing substrate according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a fan-ring plate structure according to an embodiment of the present invention. Figure 3 and Figure 4 As shown, the substrate 10 is composed of N fan ring plates 11a connected end to end, wherein each fan ring plate 11a has the same size and shape. One end of the fan ring plate 11a has a groove 112 and the other end has a protrusion 111. The protrusion 111 of one fan ring plate 11a is adapted to the groove 112 of the adjacent fan ring plate 11a, and the protrusion 111 and the corresponding groove 112 are in clearance fit.

[0064] In practical applications, the substrate 10 is composed of multiple fan-shaped ring plates 11a connected end to end, forming a first annular structure. Specifically, the first end of each fan-shaped ring plate 11a can be a protrusion 111, and the last end can be a groove 112. Each protrusion 111 can be fitted with the groove 112 of another fan-shaped ring plate 11a. The fan-shaped ring plates 11a are connected by a gap fit between the protrusion 111 and the groove 112. On the one hand, it can be made into a universal standard part, suitable for serialized products, which can ensure the reliable installation of the substrate 10 and play a positioning role. On the other hand, due to the large amount of heat accumulated on the substrate during the additive manufacturing process of the large-format structural component 30, deformation can be caused by the gap fit between the fan-shaped ring plates 11a. This can offset the large deformation caused by the cumulative stress of the entire substrate. Furthermore, since the substrate 10 is composed of multiple fan-shaped ring plates 11a connected end to end, and they are standard parts with the same shape, assembly and use are simple.

[0065] Furthermore, compared to the existing technology that uses a monolithic substrate for large-format structural components, which is difficult to reuse after deformation, leading to waste of substrate material and increasing the cost and cycle of additive manufacturing of large-size metal structural components, the exemplary embodiment of the present invention divides the substrate into multiple fan-ring plates 11a. When a fan-ring plate 11a is damaged, it can be directly replaced, reducing additive manufacturing costs. At the same time, compared to using a single, irregularly shaped square plate as the substrate, the processing cost of the fan-ring plate 11a in the exemplary embodiment of the present invention is significantly reduced.

[0066] In some embodiments, a protrusion 111 of one fan ring plate 11a is adapted to a groove 112 of an adjacent fan ring plate 11a, and the fit between the protrusion 111 and the corresponding groove 112 can also be a mortise and tenon joint. Although the individual fan ring plates 11a are fitted together with mortise and tenon joints and there is no gap between them, by using appropriate materials, the mortise and tenon joint can also produce a certain amount of deformation, reducing the substrate's response to thermal stress and lowering the possibility of severe warping deformation relative to a large-format substrate.

[0067] When each fan ring plate 11a forms a plug-in connection through the gap fit between the protrusion 111 and the groove 112, the gap between the outer wall surface of the protrusion 111 and the inner wall surface of the groove 112 is 0.5mm to 1mm.

[0068] For example, such as Figure 4 As shown, when both the protrusion 111 and the groove 112 are rectangular, the distance between the top surface of the protrusion 111 and the bottom surface of the groove 112 is 0.5mm to 1mm, and the distance between the two sides of the protrusion 111 and the corresponding sidewalls of the inner wall of the groove 112 is 0.5mm to 1mm. Within this distance range, assembly is simple and has a certain degree of mutual constraint, which can maximize the homogenization of stress / dispersion of deformation, thereby avoiding the risk of large overall deformation and cracking.

[0069] Considering that the substrate 10 needs to support the structural component 30 for additive manufacturing, the substrate 10 needs to have a certain envelope shape to prevent the structural component 30 from deviating from the substrate 10 during the additive manufacturing process, thus preventing the additive manufacturing from failing smoothly. When the bottom of the structural component 30 is a second annular structure, the outline shape of the substrate 10 is offset outward by 50mm to 100mm along the second annular structure and also offset inward by 50mm to 100mm. It should be noted that the aforementioned offset distances outward and inward along the second annular structure can be the same or different.

[0070] For example, such as Figure 2 As shown, the outer radius of the first annular structure of the substrate 10 is m, and the inner radius is n. The outer radius of the second annular structure of the structural member 30 is R, and the inner radius is r. m = R + p, n = rp, and p is 50 mm to 100 mm. That is, the second annular structure is located in the radial direction of the first annular structure, near the middle region.

[0071] When the offset distance p is 50mm to 100mm, the thickness h of the substrate 10 is 10mm to 30mm. Optionally, the thickness h of the substrate 10 is 15mm to 20mm. Within this thickness range, the substrate 10 can meet the requirements of the load-bearing structural member 30 while minimizing manufacturing costs. Furthermore, when the fit between the protrusion 111 and the corresponding groove 112 is a mortise and tenon joint, the thickness h of the substrate 10 allows each fan ring plate 11a to both constrain each other and homogenize stress / disperse deformation, thus avoiding large overall deformation.

[0072] The substrate 10 for additive manufacturing must not only consider versatility and resistance to deformation, but also minimize the amount of substrate material used. Especially for large-format structural components 30, the design of each sector ring plate 11a must also take into account shape, material cost, and manufacturing time.

[0073] The following is through Figure 5 and Figure 6 To further explain how to determine a reasonable number of fan ring plates 11a to form the first annular structure of the substrate 10.

[0074] Figure 5 This is a schematic diagram of a monolithic square plate structure according to an embodiment of the present invention. Figure 5 As shown, the envelope shape of the second annular structure of structural component 30 has an outer radius R and an inner radius r. When a square plate 50 is used as the substrate, the gap between the boundary of the square plate 50 and the structural component 30 is set to a. Then, the area of ​​the square plate 50, S1 (which is equal to the actual material size of the plate), is:

[0075] S1 = (2R + a) 2 Formula 1

[0076] When the split substrate 10 formed by each sector ring plate 11a is used in the exemplary embodiment of the present invention, the total area of ​​the substrate 10 can be reduced to:

[0077] S² = π((R + a) 2 -(ra) 2 Formula 2

[0078] Figure 6 This is a schematic diagram of a first rectangular plate structure according to an embodiment of the present invention. Figure 6 As shown, assuming the number of fan-shaped ring plates 11a constituting the first annular structure is X, and the gaps between the material boundary and the required fan-shaped ring plates 11a are b and c, the actual material feeding area is:

[0079]

[0080] Obviously, S2 < S1, and the substrate 10 using the first annular structure of the present invention saves more material. Specifically, S3 is the area of ​​all the first rectangular plates 40; b and c are the minimum distances between the fan-ring plate 11a and two adjacent sides of the first rectangular plate 40, respectively, and b and c are fixed values. When the size of the structural member 30 is fixed, the envelope shape of the second annular structure has a fixed outer radius R and an inner radius r.

[0081] As can be seen from the above, there exists an X value that minimizes the actual material feeding area S3. At this time, the X value can be rounded down, that is, N = [X], which is the number of partitions of the fan ring plate 11a with the smallest feeding area.

[0082] By dividing the second annular structure into N fan-shaped ring plates 11a, not only can the deformation caused by thermal stress be offset as much as possible, but also the material used for splicing the first annular structure is minimized through a reasonable number of blocks. It can be reused in multiple structural components 30, and production efficiency can be improved and preparation time shortened during the preparation stage of the substrate 10.

[0083] The following is a specific embodiment to illustrate the technical advantages of the additive manufacturing substrate preparation method when the first contour structure of the substrate is a first annular structure.

[0084] like Figure 2 As shown, a certain annular structural component 30 has a bottom layer shaped like a ring. Based on the annular shape of structural component 30, the overall outline shape of the substrate 10 is designed and fixed on the work platform 20. The outline shape of the substrate 10 is: offset 80mm to both sides along the annular shape of structural component 30, and the substrate thickness is 20mm.

[0085] The substrate 10 adopts a modular splicing design, taking into account the principle of minimizing overall cost and material usage. It is divided into 8 sector ring plates, and each sector ring plate 11a is spliced ​​with slots, such as... Figure 3 As shown. Each sector ring plate 11a has a through hole 12, which can be screwed into the working platform 20 with strong constraint. Each sector ring plate 11a of the base plate 10 is reusable. If a sector ring plate 11a is locally damaged or greatly deformed, only the corresponding sector ring plate 11a needs to be replaced. The gap of the slot can be 0.5 to 1 mm, which is controlled by the dimensional tolerance of the slot part (protrusion 111 and corresponding groove 112).

[0086] like Figure 5 As shown, when using a solid square panel 50, it requires panels with a size of 1500mm × 1500mm or larger for processing or direct use, and the raw material area of ​​the square panel 50 reaches 2,250,000 mm². 2 The material utilization rate is low; when using the substrate 10 of the present invention, it requires the processing of eight boards with a size of 180mm × 574mm or larger, and the raw material area of ​​the substrate 10 is 826560mm².2 It is only 36.7% of the overall square plate 50, significantly improving material utilization. This substrate 10 is suitable for a series of structural components 30 with a circular bottom shape and similar diameter.

[0087] When the second contour structure is a second linear frame structure composed of M linear frame segments, the first contour structure of the substrate is a first linear frame structure adapted to the second linear frame structure; the substrate is divided into N linear frame segments, and the sub-segments are linear frame segments, where N = M.

[0088] Figure 7 This is a schematic diagram of an additive manufacturing substrate structure according to another embodiment of the present invention. Figure 7 As shown, the bottom of the large-format structural component 30 is a second linear frame structure composed of M linear frame segments, and the first contour structure of the substrate 10 is a first linear frame structure adapted to the second linear frame structure; that is, the second linear frame structure is made by additive manufacturing on top of the first linear frame structure.

[0089] Figure 8 This is a top view of an additive manufacturing substrate according to another embodiment of the present invention; Figure 9 This is a schematic diagram of a second rectangular plate structure according to an embodiment of the present invention. Figure 8 and Figure 9 As shown, the first linear frame structure is composed of N connected second rectangular plates 11b, each second rectangular plate 11b being used to place a corresponding linear frame segment; of two connected second rectangular plates 11b, one second rectangular plate 11b has a groove 112, and the other second rectangular plate 11b has a protrusion 111, the protrusion 111 being clearance-fitted with the corresponding groove 112. The second rectangular plates 11b correspond one-to-one with the linear frame segments in the second linear frame structure.

[0090] In practical applications, the substrate 10 is composed of multiple second rectangular plates 11b, each of which is simultaneously connected to two or more other second rectangular plates 11b. That is, each second rectangular plate 11b has one or more protrusions 111 and / or grooves 112. The various second rectangular plates 11b are connected by a gap fit between the protrusions 111 and the grooves 112. On the one hand, the second rectangular plates 11b can be made into universal standard parts, suitable for serialized products. This ensures reliable installation of the substrate 10 and provides a positioning function. On the other hand, due to the large amount of heat accumulated on the substrate during the additive manufacturing process of the large-format structural component 30, deformation occurs. The gap fit can offset the potential large deformation within the gaps between the various second rectangular plates 11b, avoiding large deformation caused by accumulated stress on the overall substrate. Furthermore, since the substrate 10 is composed of multiple second rectangular plates 11b, if one of the multiple second rectangular plates 11b is damaged or deformed and becomes unusable, only the corresponding segment needs to be replaced, saving on the additive manufacturing cost of large-size structural components.

[0091] For example, the width of each second rectangular plate 11b can be the same, so that each second rectangular plate 11b can be universal; alternatively, the width of each second rectangular plate 11b can be different, which can be determined according to the width of the linear frame segment of the corresponding supporting structural member 30, so as to minimize the material feeding area of ​​the substrate 10 and save costs.

[0092] In some embodiments, a protrusion 111 of one second rectangular plate 11b is adapted to a groove 112 of another connected second rectangular plate 11b, and the fit between the protrusion 111 and the corresponding groove 112 can also be a mortise and tenon joint. The advantages of the first linear frame structure of the substrate 10, which is composed of multiple second rectangular plates 11b connected by mortise and tenon joints, are the same as the advantages of the substrate 10 having multiple fan-shaped ring plates 11a connected by mortise and tenon joints, and will not be repeated here.

[0093] When the second rectangular plates 11b are connected by a gap fit between the protrusion 111 and the groove 112, the gap between the outer wall of the protrusion 111 and the inner wall of the groove 112 is 0.5mm to 1mm. The gap fit between the second rectangular plates 11b has the same structure and advantages as the gap fit between the fan ring plates 11a, and will not be described again here.

[0094] It should be noted that, in the first linear frame structure of the substrate 10, the second rectangular plate 11b located inside the frame structure, such as Figure 8The four second rectangular plates 11b forming a cross shape are supported by the four second rectangular plates 11b located at the edge of the first linear frame structure. The connection between the four second rectangular plates 11b located inside can be achieved by the matching relationship between the protrusion 111 and the groove 112, or by matching the triangular shape of the connection position of the four second rectangular plates 11b and connecting them together by the support of the four second rectangular plates 11b at the edge.

[0095] Considering that the substrate 10 needs to support the structural component 30 for additive manufacturing, the substrate 10 needs to have a certain envelope shape to avoid the structural component 30 deviating from the substrate 10 during the additive manufacturing process, which would prevent the additive manufacturing from proceeding smoothly.

[0096] like Figure 7 As shown, each second rectangular plate 11b has two opposing second sides 13, and the linear frame segment has two opposing first sides 31. A distance p, ranging from 50 mm to 100 mm, exists between the first side 31 of the linear frame segment and the corresponding second side 13 of the second rectangular plate 11b. That is, each linear frame segment is located in the middle region of the corresponding second rectangular plate 11b.

[0097] It should be noted that the division of each linear frame segment in the second linear frame structure of structural component 30 should be at the corresponding connection position, while considering that the linear frame segments located at the edge should be divided at the connection position as little as possible.

[0098] The following is a specific embodiment to illustrate the technical advantages of the additive manufacturing substrate preparation method when the first contour structure of the substrate is a first linear frame structure.

[0099] like Figure 7 As shown, a frame-shaped structural component 30 has a bottom layer shape that is a second linear frame structure. Based on the bottom frame shape of the structural component 30, the overall outline shape of the substrate 10 is designed. The outline shape of the substrate 10 is: offset 80mm to both sides along the bottom second linear frame structure shape, and the thickness of the substrate 10 is 20mm.

[0100] The substrate 10 can be divided into 8 second rectangular plates 11b. Each second rectangular plate 11b is designed with a slot for splicing. The slots of the second rectangular plates 11b are fitted with a gap of 0.5mm to 1mm, which is controlled by the dimensional tolerance of the slot part (protrusion 111 and corresponding groove 112).

[0101] When using a 50mm square panel, a panel size of 1500mm x 1500mm or larger is required for processing or direct use, and the raw material area of ​​the substrate must reach 2,250,000mm². 2When using the first linear frame structure substrate 10 of the present invention, four 1380mm×120mm and four 650mm×120mm second rectangular plates 11b are required, and the raw material area of ​​the substrate 10 is 974400mm². 2 It is only 43.4% of the size of the overall square plate 50, significantly improving material utilization. Furthermore, this substrate 10 is suitable for a series of products with a similar bottom shape to a linear frame.

[0102] An exemplary embodiment of the present invention also provides an additive manufacturing substrate, which is prepared by the above-described additive manufacturing substrate preparation method.

[0103] Compared with the prior art, the advantages of the additive manufacturing substrate are the same as those of the additive manufacturing substrate preparation method, and will not be repeated here.

[0104] An exemplary embodiment of the present invention also provides an additive manufacturing platform, including a working platform and the additive manufacturing substrate described above. The substrate has N sub-segments, each sub-segment having at least one through hole for bolts to pass through, the through hole being used to screw the corresponding sub-segment to the working platform through the bolts.

[0105] When the substrate is composed of multiple identical sector ring plates 11a, such as Figure 2 As shown, in addition to using the fit between the protrusion 111 and the corresponding groove 112 to form a constraint between multiple fan ring plates 11a, in order to further achieve a strong constraint between each fan ring plate 11a, one or more through holes 12 can be provided in each fan ring plate 11a. Since multiple crisscrossing wedge-shaped grooves are formed on the surface of the work platform 20, each fan ring plate 11a can be strongly constrained and fixed to the surface of the work platform 20 by passing a bolt through the through hole 12 and fitting it with the wedge-shaped groove, thereby forming an additive manufacturing platform.

[0106] When the substrate is composed of N second rectangular plates 11b, in addition to using the cooperation between the protrusions 111 and the corresponding grooves 112 to form a constraint between the multiple second rectangular plates 11b, in order to further achieve a strong constraint between each second rectangular plate 11b, one or more through holes 12 can be provided on each second rectangular plate 11b. Since multiple crisscrossing wedge-shaped grooves are formed on the surface of the work platform 20, each second rectangular plate 11b can be strongly constrained and fixed on the surface of the work platform 20 by passing a bolt through the through hole 12 and cooperating with the wedge-shaped groove, thereby forming an additive manufacturing platform.

[0107] Compared to existing technologies, the advantages of the additive manufacturing platform are the same as those of the additive manufacturing substrate preparation method, and will not be repeated here.

[0108] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A method for preparing an additive manufacturing substrate, characterized in that, The substrate is used for additive manufacturing of large-format structural components, and the preparation method includes: Obtain the second contour structure of the bottom of the structural component; Based on the second contour structure, a first contour structure of the substrate is determined, wherein the first contour structure is adapted to the second contour structure; the second contour structure has opposing inner and outer sides, and the first contour structure of the substrate is determined by offsetting the second contour structure inward and outward by a preset distance; the preset distance p is 50mm~100mm; Based on the shape of the first contour structure of the substrate, the thickness of the substrate is determined, and the thickness of the substrate is h, where h:p = (1~3):(5~10). Based on the principle of minimizing material input, the substrate is divided into N sub-segments. When the second contour structure is a second annular structure and the first contour structure of the substrate is a first annular structure adapted to the second annular structure, the substrate is divided into N equal sub-segments, each sub-segment being a fan-shaped ring plate. Each sub-segment has at least one groove and at least one protrusion. The protrusion of one sub-segment is adapted to the groove of an adjacent sub-segment, and the protrusion and the corresponding groove are in clearance fit. The gap between the outer wall of the protrusion and the inner wall of the groove is 0.5mm~1mm. The outer radius of the first annular structure is m, and the inner radius is n. The outer radius of the second annular structure is R, and the inner radius is r. Wherein, m=R+p, n=rp. The fan-shaped ring plate is a plate cut from a first rectangular plate. The number of fan-shaped ring plates N=[X], where X minimizes the actual material input area S3, and X satisfies: ； Where S3 is the area of ​​all the first rectangular plates; b and c are the minimum distances between the fan ring plate and two adjacent sides of the first rectangular plate, respectively, and b and c are fixed values; X is a variable; when a whole square plate is used as the substrate, a is the distance between the boundary of the square plate and the structural component; where N≥2.

2. The preparation method according to claim 1, characterized in that, The thickness of the substrate is 10mm to 30mm.

3. The preparation method according to claim 1, characterized in that, The groove is shaped like a spherical crown, an ellipse, a polygon, or a wedge.

4. The preparation method according to any one of claims 1-3, characterized in that, Based on the principle of minimizing material input, the substrate is divided into N sub-segments, including: When the second contour structure is a second linear frame structure composed of M linear frame segments, and the first contour structure of the substrate is a first linear frame structure adapted to the second linear frame structure, the substrate is divided into N second rectangular plates corresponding to the linear frame segments, and the sub-segment is a second rectangular plate, where N=M.

5. An additively manufactured substrate, characterized in that, A substrate prepared by the preparation method according to any one of claims 1-4.

6. An additive manufacturing platform, characterized in that, Includes a working platform and the additive manufacturing substrate as described in claim 5; The substrate has N sub-segments, each sub-segment having at least one through hole for bolts to pass through, the through hole being used to screw the corresponding sub-segment to the work platform.

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