A method for metal additive manufacturing of thin-walled plate-like structures

Abstract

The present application relates to the technical field of metal additive manufacturing, and particularly relates to a metal additive manufacturing method for a thin-walled plate structure, comprising the following steps: determining a group of out-of-plane deformation excessive regions on a set of relative planes of the thin-walled plate structure as to-be-maintained-shape regions based on simulation analysis; determining the length d of a maintained-shape structure based on the width b of the thin-walled plate structure; determining the number n of the maintained-shape structures and the interval l of the maintained-shape structures based on the distance L of the two farthest to-be-maintained-shape regions in the width direction of the parallel thin-walled plate structure and the length d of the maintained-shape structure; the maintained-shape structure is a reinforcing connecting structure protruding from the relative plane and capable of integrally connecting each point on the to-be-maintained-shape region. The present application designs the maintained-shape structure through simulation analysis, applies an external resistance deformation external force to the to-be-maintained-shape region, improves the rigidity of the to-be-maintained-shape region, and solves the problems of large deformation in the thickness direction and the width direction and poor machining precision in the prior art of metal additive manufacturing of the thin-walled plate structure.

Description

Technical Field

[0001] This invention relates to the field of metal additive manufacturing technology, and more particularly to a method for manufacturing metal additive structures for thin-walled plate-like structures. Background Technology

[0002] Metal additive manufacturing is a technology that creates three-dimensional parts by adding materials layer by layer. Specialized software slices and layers the part into a three-dimensional digital model, obtaining cross-sectional contour data that serves as the scanning trajectory for a heat source. In the metal additive manufacturing process, a laser beam is controlled to melt and solidify the powder along the scanning trajectory to complete the two-dimensional forming. Layer by layer, the final three-dimensional model is created. Compared to traditional manufacturing technologies, additive manufacturing features shorter cycle times, higher efficiency, and higher material utilization.

[0003] In metal additive manufacturing, the stacking direction is the Z-axis, and the plane perpendicular to the Z-axis has X and Y axes. For the processing of large thin-walled parts, due to the limited width of additive manufacturing equipment, the length direction is often parallel to the Z-axis, while the plane containing the thickness and width of the thin-walled part is perpendicular to the Z-axis. During additive manufacturing, the X and Y directions will experience significant deformation due to the cumulative thermal stress of additive manufacturing. The thinner the thin-walled structure and the larger the X and Y dimensions, the more pronounced the deformation of the plate-like structure (e.g., parts where the length, width, and thickness ratio of the thin-walled structure is greater than 50).

[0004] There is a lack of additive manufacturing methods for thin-walled plate-shaped metal parts with small deformation in the XY direction and high processing accuracy in the existing technology. Summary of the Invention

[0005] In view of the above analysis, the present invention aims to provide a metal additive manufacturing method for thin-walled plate-like structures, so as to solve at least one of the technical problems existing in the additive manufacturing of thin-walled plate-like metal parts, such as large deformation in the XY direction and poor processing accuracy.

[0006] The objective of this invention is mainly achieved through the following technical solutions:

[0007] This invention discloses a method for metal additive manufacturing of thin-walled plate-like structures, comprising:

[0008] S1: Based on simulation analysis, a set of regions with excessive deformation on a set of relative planes of the thin-walled plate structure are identified as regions to be shaped. The relative planes are simultaneously parallel to the length and width directions of the thin-walled plate structure.

[0009] S2: Determine the length d of the V-shaped structure based on the width b of the thin-walled plate-like structure;

[0010] S3: Determine the number n of the dimensional structures and the spacing l of the dimensional structures based on the distance L between the two farthest dimensional regions in the width direction of the parallel thin-walled plate-like structure and the length d of the dimensional structure;

[0011] The dimensional structure is a reinforced connection structure that protrudes from the opposite plane, which can fix and connect all points on the area to be dimensionally shaped.

[0012] Preferably, S1 includes:

[0013] S101: During simulation analysis, establish the same three-dimensional coordinate system as 3D printing, with the stacking direction and the length direction of thin-walled parts as the Z-axis, the thickness direction as the Y-axis, and the width direction as the X-axis;

[0014] S102: Based on simulation analysis, the deformation information of each region on the plane of the thin-walled plate structure that is parallel to the length and width directions of the thin-walled plate structure can be intuitively obtained according to the color.

[0015] S103: Select the region whose absolute value of deformation is greater than or equal to the first limit value as the region to be shaped, or select a set of multiple regions whose center distance between them is less than the second limit value as the region to be shaped.

[0016] S104: Construct circumscribed quadrilaterals of the region to be shaped in the plane containing the X-axis and Z-axis, with side lengths parallel to the X-axis and Z-axis respectively. The distance between the centers of the farthest circumscribed quadrilaterals is taken as L.

[0017] Preferably, S103 includes:

[0018] S1031: Select the center of the region whose absolute value of deformation is greater than or equal to the first limit value, and determine the distance between the center of the region whose absolute value of deformation is greater than or equal to the first limit value and the center of the adjacent region whose absolute value of deformation is greater than or equal to the first limit value. The set of multiple regions whose center distance is less than the second limit value together constitutes a region to be shaped.

[0019] S1032: The regions whose absolute values ​​of the remaining deformations are greater than or equal to the first limit value are separately formed into a region to be deformed.

[0020] Preferably, in S2, the length d of the V-shaped structure is determined based on the width b of the thin-walled plate-like structure, satisfying: d = (0.05 ~ 0.5) × b.

[0021] Preferably, in S3, the spacing l of the dimensional structure is determined based on the length L of the region to be dimensional in the direction parallel to the width of the thin-walled plate-like structure and the length d of the dimensional structure, satisfying: l = (0.3~0.6) × d.

[0022] Preferably, in S3, the number n of the three-dimensional structures is determined based on the length L of the region to be three-dimensional in the direction parallel to the width of the thin-walled plate-like structure and the length d of the three-dimensional structure, satisfying: int(3L / 2d)≤n≤int(2L / d), where int() indicates that the operation takes an integer value.

[0023] Preferably, the dimensional structure includes a rib-shaped support structure and a point-shaped support structure;

[0024] The rib-shaped support structure protrudes from the surface of the thin-walled plate-shaped structure to form a columnar cavity, and the axis of the columnar cavity is set parallel to the Z-axis direction;

[0025] The point-like support structure is composed of multiple rigid connecting rods. One end of each rigid connecting rod is fixedly connected to the surface of the thin-walled plate-like structure, and the other end is fixedly connected to the inner surface of the rib-like support structure.

[0026] Preferably, the point-support structure is configured to satisfy the following:

[0027] The cylindrical cavity is divided into multiple rectangular parallelepiped units of the same size;

[0028] The cuboid units are stacked in multiple layers, with each layer having multiple cuboid units. Adjacent cuboid units share a common edge and four vertices.

[0029] Construct a diagonal by connecting the top vertex of the upper surface with the farthest vertex of the lower surface, and select one of the diagonals as the trajectory for setting the rigid connecting rod.

[0030] Preferably, the height of the protruding plane of the rib-shaped support structure is in the range of (0.05~0.5)×h, where h is the thickness of the thin-walled plate-like structure.

[0031] A thin-walled plate-like structure with low surface deformation, manufactured by the above-described metal additive manufacturing method for thin-walled plate-like structures, characterized in that it comprises:

[0032] Thin-walled plate-like structure body, dimensional structure;

[0033] The thin-walled plate-like structure body has two opposing planes that are parallel in both length and width directions;

[0034] The dimensional structure has multiple parts, protruding from the opposite plane and symmetrically arranged on the opposite plane;

[0035] The dimensional structure is designed according to the distribution pattern of the deformation-exceeding areas on a plane parallel to the length and width directions.

[0036] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0037] (1) This invention determines the deformation-to-shape region that exceeds the standard through simulation analysis, and designs the deformation-to-shape structure based on the distance L, applies external resistance to deformation to the deformation-to-shape region, improves the stiffness of the deformation-to-shape region, and solves the problems of large deformation in the thickness and width directions and poor processing accuracy in the additive manufacturing of thin-walled plate-shaped metal parts in the prior art.

[0038] (2) This invention achieves comprehensive analysis and determination by determining the deformation of all regions through simulation analysis, avoiding omissions in the regions to be shaped, which helps to improve the accuracy of analysis. At the same time, by judging the distance between adjacent regions for regions whose absolute value of deformation is greater than or equal to the first limit value, the adjacent regions are considered as one shaped region, which reduces the workload of subsequent shaped region construction and improves analysis efficiency.

[0039] (3) By selecting a portion of the region to be deformed according to a set rule, the present invention avoids setting a structural structure in the entire region to be deformed. Compared with the prior art, which sets a structural structure in the entire deformable region, the present invention reduces the number or total weight of structural structures while ensuring the control of deformation, which greatly reduces the total weight and cost of thin-walled plate structure and is conducive to achieving lightweighting.

[0040] (4) By setting a rib-shaped support structure and a point-shaped support structure with rigid connecting rods in the dimensional structure, the present invention greatly improves the rigidity of the thin-walled plate structure and reduces the amount of deformation.

[0041] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0042] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0043] Figure 1 This is a front view of a thin-walled plate-like structure in one embodiment of the present invention;

[0044] Figure 2 This is a top view of a thin-walled plate-like structure in one embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of the dimensional structure in one embodiment of the present invention;

[0046] Figure 4a This is one method of setting rigid connecting rods in a point-supported structure;

[0047] Figure 4b This is another way to set up rigid connecting rods in point-supported structures;

[0048] Figure 5 Simulation analysis diagram of a thin-walled plate-like structure without added dimensional structures;

[0049] Figure 6 This is a simulation analysis diagram of the thin-walled plate-like structure manufactured in Embodiment 1 of the present invention;

[0050] Figure 7 This is a simulation analysis diagram of the thin-walled plate-like structure manufactured in Comparative Example 1 of this invention;

[0051] Figure 8 This is a simulation analysis diagram of the thin-walled plate-like structure manufactured in Comparative Example 2 of the present invention.

[0052] Figure label:

[0053] Thin-walled plate-like structure 1, dimensional structure 2, rib-like support structure 05, point-like support structure 06, rigid connecting rod 061. Detailed Implementation

[0054] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0055] On one hand, this invention discloses a method for additive manufacturing of thin-walled plate-like structures, wherein the length-to-thickness ratio, width-to-thickness ratio, and other parameters of the thin-walled plate-like structures are all greater than 50, comprising:

[0056] S1: Based on simulation analysis, a set of regions with excessive deformation on a set of relative planes of the thin-walled plate structure are identified as regions to be shaped. The relative planes are simultaneously parallel to the length and width directions of the thin-walled plate structure.

[0057] S2: Determine the length d of the V-shaped structure based on the width b of the thin-walled plate-like structure;

[0058] S3: Determine the number n of the dimensional structures and the spacing l of the dimensional structures based on the distance L between the two farthest dimensional regions in the width direction of the parallel thin-walled plate-like structure and the length d of the dimensional structure;

[0059] The dimensional structure is a reinforced connection structure that protrudes from the opposite plane, which can fix and connect all points on the area to be dimensionally shaped.

[0060] For example, a thin-walled plate-like structure can be a thin-walled cuboid or part of a cuboid with a thickness of 0.7 mm to 3 mm and a length and width of 150 mm to 900 mm.

[0061] It should be noted that the thin-walled plate-like structure of the present invention has three types of planes: a plane that is parallel to both the length and width directions, a plane that is parallel to both the thickness and width directions, and a plane that is parallel to both the thickness and length directions. Because the length-to-thickness ratio and the width-to-thickness ratio of the thin-walled plate-like structure are both greater than 50, the thermal deformation of the plane that is parallel to both the length and width directions is much more severe than the other two types. In actual research, the thermal deformation on these two types of planes is often within a controllable range. Therefore, the present invention focuses on controlling the thermal deformation of the plane that is parallel to both the length and width directions on the thin-walled plate-like structure.

[0062] Compared with the prior art, the present invention determines the region to be shaped due to excessive deformation through simulation analysis, and designs the shaped structure based on the distance L, applies external resistance to deformation to the region to be shaped, improves the stiffness of the region to be shaped, and solves the problems of large deformation in the thickness and width directions and poor processing accuracy in the additive manufacturing of thin-walled plate-shaped metal parts in the prior art.

[0063] Specifically, S1 includes:

[0064] S101: During simulation analysis, establish the same three-dimensional coordinate system as 3D printing, with the stacking direction and the length direction of thin-walled parts as the Z-axis, the thickness direction as the Y-axis, and the width direction as the X-axis;

[0065] S102: Based on simulation analysis, the deformation information of each region on the plane of the thin-walled plate structure that is parallel to the length and width directions of the thin-walled plate structure can be intuitively obtained according to the color.

[0066] S103: Select the region whose absolute value of deformation is greater than or equal to the first limit value as the region to be shaped, or select a set of multiple regions whose center distance between them is less than the second limit value as the region to be shaped.

[0067] S104: Construct circumscribed quadrilaterals of the region to be shaped in the plane containing the X-axis and Z-axis, with side lengths parallel to the X-axis and Z-axis respectively. The distance between the centers of the farthest circumscribed quadrilaterals is taken as L.

[0068] Specifically, the first limit value can be 0.63 mm, and the second limit value can be 5 mm.

[0069] Specifically, S103 includes:

[0070] S1031:

[0071] Select the center of the region whose absolute value of deformation is greater than or equal to the first limit value, and determine the distance between the center of the region whose absolute value of deformation is greater than or equal to the first limit value and the center of the adjacent region whose absolute value of deformation is greater than or equal to the first limit value. The set of multiple regions whose center distance is less than the second limit value constitutes a region to be shaped.

[0072] S1032: The regions whose absolute values ​​of the remaining deformations are greater than or equal to the first limit value are separately formed into a region to be deformed.

[0073] Compared with existing technologies, this invention achieves comprehensive analysis and determination by determining the deformation of all regions through simulation analysis, avoiding omissions in the regions to be shaped, and helping to improve the accuracy of analysis. At the same time, by judging the distance between neighboring regions for regions whose absolute value of deformation is greater than or equal to the first limit value, the neighboring regions are considered as one shaped region, reducing the workload of subsequent shaped region construction and improving analysis efficiency.

[0074] Specifically, in S2, the length d of the V-shaped structure is determined based on the width b of the thin-walled plate-like structure, satisfying: d = (0.05 ~ 0.5) × b.

[0075] Preferably, d = 45mm to 70mm, and can be 45mm, 46mm, 48mm, 49mm, 50mm, 52mm, 53mm, 54mm, 55mm, 57mm, 58mm, 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm or 70mm.

[0076] It should be noted that the length of the dimensional structure is related to the width b of the thin-walled plate-like structure. When the width b of the thin-walled plate-like structure is large, it is more economical to pair it with a shorter length of the dimensional structure, and when the width b of the thin-walled plate-like structure is small, it is more economical to pair it with a longer length of the dimensional structure.

[0077] Specifically, in S3, the spacing l of the dimensional structure is determined based on the length L of the region to be dimensional in the direction of the width of the parallel thin-walled plate structure and the length d of the dimensional structure, satisfying: l = (0.3 ~ 0.6) × d.

[0078] Preferably, l = 14mm to 42mm, and can be 14mm, 15mm, 16mm, 18mm, 20mm, 22mm, 24mm, 25mm, 26mm, 27mm, 28mm, 30mm, 32mm, 33mm, 34mm, 36mm, 38mm, 40mm, 41mm or 42mm.

[0079] Specifically, in S3, the number of V-shaped structures n is determined based on the length L of the region to be V-shaped in the direction of the width of the parallel thin-walled plate-like structure and the length d of the V-shaped structure, satisfying: int(3L / 2d)≤n≤int(2L / d), where int() indicates that the operation takes integer values.

[0080] Preferably, n can be any integer between 1 and 6, such as 1, 2, 3, 4, 5 or 6.

[0081] Compared with the prior art, the present invention selects a portion of the region to be deformed according to a set rule to set a dimensional structure, thus avoiding setting a dimensional structure in the entire region to be deformed. Compared with the prior art scheme of setting a dimensional structure in the entire deformable region, this invention reduces the number or total weight of dimensional structures while ensuring the control of deformation, which greatly reduces the total weight and cost of thin-walled plate-like structures and is conducive to achieving lightweighting.

[0082] Specifically, the dimensional structure includes a rib-shaped support structure 05 and a point-shaped support structure 06;

[0083] The rib-shaped support structure 05 protrudes from the surface of the thin-walled plate-shaped structure to form a columnar cavity, and the axis of the columnar cavity is set parallel to the Z-axis direction;

[0084] The point support structure 06 is composed of multiple rigid connecting rods 061. One end of the rigid connecting rod 061 is fixedly connected to the surface of the thin-walled plate-like structure, and the other end is fixedly connected to the inner surface of the rib-like support structure 05.

[0085] During implementation, multiple rigid connecting rods 061 fix and rigidly connect multiple dense points on the surface of the thin-walled plate-like structure to the rib-like support structure 05. Since the deformation of the surface of the thin-walled plate-like structure needs to overcome the rigidity of itself and the rib-like support structure at the same time, the amount of deformation is greatly reduced, which can effectively suppress the thermal deformation caused by uneven heating and cooling rates of each layer during thermoforming.

[0086] Compared with the prior art, the present invention greatly improves the rigidity of the thin-walled plate structure and reduces the amount of deformation by setting rib-shaped support structure and point support structure with rigid connecting rods in the V-shaped structure.

[0087] Specifically, the height of the protruding plane of the rib-shaped support structure ranges from (0.05 to 0.5) × h, where h is the thickness of the thin-walled plate-like structure.

[0088] Preferably, the axial length of the column cavity is the same as the length of the thin-walled plate structure in the Z-axis direction, that is, the rib-shaped support structure 05 is at the same height as the thin-walled plate structure.

[0089] Preferably, the point-support structure 06 is configured according to... Figures 4a-4b The dot matrix structure shown is configured as follows:

[0090] The cylindrical cavity is divided into multiple rectangular parallelepiped units of the same size;

[0091] The cuboid units are stacked in multiple layers, with each layer containing multiple cuboid units. Adjacent cuboid units share a common edge and four vertices.

[0092] The vertices of the upper top surface are A, B, C, and D, and the vertices of the lower top surface corresponding to the projection positions are A', B', C', and D'. Connect the vertices of the upper top surface A, B, C, and D with the vertices of the lower top surface that are furthest away A', B', C', and D' to construct a diagonal. Select one of the diagonals as the trajectory for setting the rigid connecting rod.

[0093] Preferably, the rigid connecting rods in the same layer have the same trajectory.

[0094] It should be noted that the rigid connecting rods on the same layer are set in the same direction, which helps to ensure that the thin-walled plate structure is subjected to uniform stress at the same height.

[0095] More preferably, the trajectories of the rigid connecting rods in the upper and lower adjacent layers are different, and the horizontal projections of the rigid connecting rods in the adjacent layers are intersected.

[0096] It should be noted that the horizontal projections of the rigid connecting rods in adjacent layers are intersected, which makes the X-axis coordinates of the connection points between different rigid connecting rods and the surface of the thin-walled plate structure different, forming an orderly misalignment, thereby improving the uniformity of stress on the surface of the thin-walled plate structure.

[0097] Preferably, the wall thickness of the rib-shaped support structure is greater than or equal to the thickness of the thin-walled plate-shaped structure;

[0098] The diameter of the rigid connecting rod is less than or equal to the thickness of the thin-walled plate-like structure.

[0099] It should be noted that having a wall thickness greater than or equal to that of the thin-walled plate structure is beneficial for improving the rigidity of the ribbed support structure; and having a diameter less than or equal to that of the thin-walled plate structure is beneficial for preventing excessive stress on the surface of the thin-walled plate structure at the connection point with the rigid connecting rod, which could cause reverse deformation.

[0100] Specifically, the simulation analysis software could be Magics.

[0101] In a second aspect, the present invention discloses a thin-walled plate-like structure with low surface deformation, manufactured by the above-described additive manufacturing method, comprising:

[0102] Thin-walled plate-like structure body 1, V-shaped structure 2; The thin-walled plate-like structure body has two opposing planes that are parallel to the length and width directions at the same time;

[0103] Multiple V-shaped structures 2 are provided, protruding from the opposite plane and symmetrically arranged on the opposite plane;

[0104] The 2-dimensional structure is set according to the distribution pattern of the deformation exceeding the standard area on the plane parallel to the length and width directions.

[0105] Specifically, the spacing l of the V-shaped structure satisfies: l = (0.3~0.6) × d; the length d of the V-shaped structure satisfies: d = (0.05~0.5) × b, where b is the width of the thin-walled plate-like structure.

[0106] Specifically, the number of dimensional structures n satisfies: int(3L / 2d)≤n≤int(2L / d), where int() indicates that the operation takes an integer value, and L is the distance between the two farthest dimensional regions to be dimensional in the direction parallel to the width of the thin-walled plate-like structure.

[0107] Example 1

[0108] This embodiment discloses a metal additive manufacturing method for thin-walled plate-like structures, such as... Figure 1 As shown, the thin-walled plate-like structure has a width b of 450 mm, a thickness h of 2 mm, and a length a of 10 mm at the front end and 160 mm at the rear end; the manufacturing method includes:

[0109] S1: Using Magics simulation analysis, a set of regions with excessive deformation on a set of relative planes of the thin-walled plate structure are identified as regions to be shaped. The relative planes are simultaneously parallel to the length and width directions of the thin-walled plate structure.

[0110] S101: During simulation analysis, establish the same three-dimensional coordinate system as 3D printing, with the stacking direction and the length direction of thin-walled parts as the Z-axis, the thickness direction as the Y-axis, and the width direction as the X-axis;

[0111] S102: Based on simulation analysis, the deformation information of each region on the plane of the thin-walled plate structure that is parallel to the length and width directions of the thin-walled plate structure can be intuitively obtained according to the color.

[0112] S103: Select the region whose absolute value of deformation is greater than or equal to the first limit value as the region to be shaped, or select a set of multiple regions whose center distance between them is less than the second limit value as the region to be shaped.

[0113] S1031: Select the center of the region whose absolute value of deformation is greater than or equal to the first limit value and the center of the adjacent region whose absolute value of deformation is greater than or equal to the first limit value for distance judgment, and combine the set of multiple regions whose center distance is less than the second limit value to form a region to be shaped.

[0114] S1032: The regions whose absolute values ​​of the remaining deformations are greater than or equal to the first limit value are separately formed into a region to be deformed;

[0115] S104: Construct the circumscribed quadrilaterals of the region to be shaped in the planes containing the X and Z axes, with side lengths parallel to the X and Z axes respectively. Let the distance between the centers of the farthest circumscribed quadrilaterals be L. Figure 5 L≈420mm.

[0116] S2: Determine the length d of the V-shaped structure based on the width b of the thin-walled plate-like structure, where d = 50 mm;

[0117] S3: Determine the number n of the dimensional structures and the spacing l of the dimensional structures based on the distance L between the two farthest dimensional regions in the width direction of the parallel thin-walled plate-like structure and the length d of the dimensional structure;

[0118] The dimensional structure is a reinforced connection structure that protrudes from the opposite plane, which can fix and connect all points on the area to be dimensionally shaped.

[0119] n is 6, l is 25mm.

[0120] The wall thickness of the rib-shaped support structure 05 is 2mm, the height of the protruding plane of the rib-shaped support structure is 22mm, the thickness of the thin-walled plate structure is also 2mm, and the diameter of the rigid connecting rod is 1mm.

[0121] Point-support structure 06 according to Figures 4a-4b The dot matrix structure shown is configured as follows:

[0122] The cylindrical cavity is divided into multiple cubic units of the same size, 20mm×20mm×20mm;

[0123] The cube units are arranged in multiple layers, with each layer containing multiple cube units. Adjacent cube units share a common edge and four vertices.

[0124] The vertices of the upper top surface are A, B, C, and D, and the vertices of the lower top surface corresponding to the projection positions are A', B', C', and D'. Connect the vertices of the upper top surface A, B, C, and D with the vertices of the lower top surface that are furthest away A', B', C', and D' to construct a diagonal. Select one of the diagonals as the trajectory for setting the rigid connecting rod.

[0125] The rigid connecting rods on the same layer have the same installation trajectory. The rigid connecting rods on two adjacent layers have different installation trajectories, and the horizontal projections of the rigid connecting rods on adjacent layers intersect.

[0126] This embodiment also discloses a thin-walled plate-like structure with low surface deformation, manufactured by the above-described additive manufacturing method, comprising:

[0127] Thin-walled plate-like structure body 1, V-shaped structure 2; The thin-walled plate-like structure body has two opposing planes that are parallel to the length and width directions at the same time;

[0128] Multiple V-shaped structures 2 are provided, protruding from the opposite plane and symmetrically arranged on the opposite plane;

[0129] On the same plane in the same parallel length and width direction of the thin-walled plate-like structure body, the V-shaped structure 2 is set according to the distribution law of the deformation exceeding the standard area on the plane in the parallel length and width direction.

[0130] The spacing of the dimensional structures is l = 25 mm; the length of the dimensional structure is d = 50 mm; the number of dimensional structures is n = 6.

[0131] Simulation analysis results are as follows Figure 5 , Figure 6 As shown, the absolute value of the maximum deformation of the structure without the ribbed structure is 1.30 mm, while the absolute value of the maximum deformation of the structure with the ribbed structure is reduced to 0.58 mm.

[0132] Example 2

[0133] This embodiment discloses a metal additive manufacturing method for thin-walled plate-like structures, such as... Figure 1 As shown, the thin-walled plate-like structure has a width b of 500mm, a thickness h of 2mm, and a length a of 50mm at the front and 200mm at the rear; the manufacturing method includes:

[0134] S1: Using Magics simulation analysis, a set of regions with excessive deformation on a set of relative planes of the thin-walled plate structure are identified as regions to be shaped. The relative planes are simultaneously parallel to the length and width directions of the thin-walled plate structure.

[0135] S101: During simulation analysis, establish the same three-dimensional coordinate system as 3D printing, with the stacking direction and the length direction of thin-walled parts as the Z-axis, the thickness direction as the Y-axis, and the width direction as the X-axis;

[0136] S102: Based on simulation analysis, the deformation information of each region on the plane of the thin-walled plate structure that is parallel to the length and width directions of the thin-walled plate structure can be intuitively obtained according to the color.

[0137] S103: Select the region whose absolute value of deformation is greater than or equal to the first limit value as the region to be shaped, or select a set of multiple regions whose center distance between them is less than the second limit value as the region to be shaped.

[0138] S1031: Select the center of the region whose absolute value of deformation is greater than or equal to the first limit value and the center of the adjacent region whose absolute value of deformation is greater than or equal to the first limit value for distance judgment, and combine the set of multiple regions whose center distance is less than the second limit value to form a region to be shaped.

[0139] S1032: The regions whose absolute values ​​of the remaining deformations are greater than or equal to the first limit value are separately formed into a region to be deformed;

[0140] S104: Construct circumscribed quadrilaterals of the region to be shaped in the plane containing the X-axis and Z-axis, with side lengths parallel to the X-axis and Z-axis respectively. The distance between the centers of the farthest circumscribed quadrilaterals is taken as L. Simulation analysis shows that L≈450mm.

[0141] S2: Determine the length d of the V-shaped structure based on the width b of the thin-walled plate-like structure, where d = 50 mm;

[0142] S3: Determine the number n of the dimensional structures and the spacing l of the dimensional structures based on the distance L between the two farthest dimensional regions in the width direction of the parallel thin-walled plate-like structure and the length d of the dimensional structure;

[0143] The dimensional structure is a reinforced connection structure that protrudes from the opposite plane, which can fix and connect all points on the area to be dimensionally shaped.

[0144] n is 5, l is 30mm.

[0145] The wall thickness of the rib-shaped support structure 05 is 2mm, the height of the protruding plane of the rib-shaped support structure is 22mm, the thickness of the thin-walled plate structure is also 2mm, and the diameter of the rigid connecting rod is 1mm.

[0146] Point-support structure 06 according to Figures 4a-4b The dot matrix structure shown is configured as follows:

[0147] The cylindrical cavity is divided into multiple cubic units of the same size, 20mm×20mm×20mm;

[0148] The cube units are arranged in multiple layers, with each layer containing multiple cube units. Adjacent cube units share a common edge and four vertices.

[0149] The vertices of the upper top surface are A, B, C, and D, and the vertices of the lower top surface corresponding to the projection positions are A', B', C', and D'. Connect the vertices of the upper top surface A, B, C, and D with the vertices of the lower top surface that are furthest away A', B', C', and D' to construct a diagonal. Select one of the diagonals as the trajectory for setting the rigid connecting rod.

[0150] The rigid connecting rods on the same layer have the same installation trajectory. The rigid connecting rods on two adjacent layers have different installation trajectories, and the horizontal projections of the rigid connecting rods on adjacent layers intersect.

[0151] This embodiment also discloses a thin-walled plate-like structure with low surface deformation, manufactured by the above-described additive manufacturing method, comprising:

[0152] Thin-walled plate-like structure body 1, V-shaped structure 2; The thin-walled plate-like structure body has two opposing planes that are parallel to the length and width directions at the same time;

[0153] Multiple V-shaped structures 2 are provided, protruding from the opposite plane and symmetrically arranged on the opposite plane;

[0154] On the same plane in the same parallel length and width direction of the thin-walled plate-like structure body, the V-shaped structure 2 is set according to the distribution law of the deformation exceeding the standard area on the plane in the parallel length and width direction.

[0155] The spacing of the dimensional structures is l = 30 mm; the length of the dimensional structure is d = 50 mm; the number of dimensional structures is n = 5.

[0156] Simulation analysis results show that the absolute value of the maximum deformation is significantly reduced after adding the dimensional structure compared to before adding the dimensional structure.

[0157] Comparative Example 1

[0158] This comparative example discloses a metal additive manufacturing method for thin-walled plate-like structures, and uses the method to manufacture thin-walled plate-like structures with low surface deformation. Compared with Example 1, d = 5 mm, which does not satisfy d = (0.05~0.5) × b, but the rest is the same as Example 1.

[0159] Simulation analysis results are as follows Figure 7 As shown, when d is 5mm, the absolute value of the maximum deformation is 1.02mm, which is much greater than that of Example 1.

[0160] Comparative Example 2

[0161] This comparative example discloses a metal additive manufacturing method for thin-walled plate-like structures, and uses the method to manufacture thin-walled plate-like structures with low surface deformation. Compared with Example 1, n = 3, and n does not satisfy: int(3L / 2d) ≤ n ≤ int(2L / d), the rest is the same as Example 1.

[0162] Simulation analysis results are as follows Figure 8 As shown, when n is 3, the absolute value of the maximum deformation is 1.05 mm, which is much greater than that of Example 1.

[0163] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for additive manufacturing of metals for thin-walled plate-like structures, characterized in that, include: S1: Based on simulation analysis, a set of regions with excessive deformation on a set of relative planes of the thin-walled plate structure are identified as regions to be shaped. The distance between the two regions to be shaped that are farthest apart in the direction parallel to the width of the thin-walled plate structure is defined as L. The relative planes are simultaneously parallel to the length and width directions of the thin-walled plate structure. S2: Determine the length d of the V-shaped structure based on the width b of the thin-walled plate-like structure, where d = (0.05 ~ 0.5) × b; S3: Determine the number n of the dimensional structures and the spacing l of the dimensional structures based on the distance L between the two farthest dimensional regions in the width direction of the parallel thin-walled plate-like structure and the length d of the dimensional structure; S1 includes: S101: During simulation analysis, establish the same three-dimensional coordinate system as 3D printing, with the stacking direction and the length direction of thin-walled parts as the Z-axis, the thickness direction as the Y-axis, and the width direction as the X-axis; S102: Based on simulation analysis, the deformation information of each region on the plane of the thin-walled plate structure that is parallel to the length and width directions of the thin-walled plate structure can be intuitively obtained according to the color. S103: Select the region whose absolute value of deformation is greater than or equal to the first limit value as the region to be shaped, or select a set of multiple regions whose center distance between them is less than the second limit value as the region to be shaped. S104: Construct circumscribed quadrilaterals of the region to be shaped in the plane containing the X-axis and Z-axis, with the side lengths parallel to the X-axis and Z-axis respectively. The distance between the centers of the circumscribed quadrilaterals that are farthest apart is taken as L. The dimensional structure is a reinforced connection structure that protrudes from the opposite plane, which can fix and connect all points on the area to be dimensionally shaped. The dimensional structure includes a rib-like support structure and a point-like support structure; The rib-shaped support structure protrudes from the surface of the thin-walled plate-shaped structure to form a columnar cavity, and the axis of the columnar cavity is set parallel to the Z-axis direction; The point-like support structure is composed of multiple rigid connecting rods. One end of each rigid connecting rod is fixedly connected to the surface of the thin-walled plate-like structure, and the other end is fixedly connected to the inner surface of the rib-like support structure.

2. The method for metal additive manufacturing of thin-walled plate-like structures according to claim 1, characterized in that, S103 includes: S1031: Select the center of the region whose absolute value of deformation is greater than or equal to the first limit value, and determine the distance between the center of the region whose absolute value of deformation is greater than or equal to the first limit value and the center of the adjacent region whose absolute value of deformation is greater than or equal to the first limit value. The set of multiple regions whose center distance is less than the second limit value together constitutes a region to be shaped. S1032: The regions whose absolute values ​​of the remaining deformations are greater than or equal to the first limit value are separately formed into a region to be deformed.

3. The metal additive manufacturing method for thin-walled plate-like structures according to claim 1, characterized in that, In S3, the spacing l of the dimensional structure is determined based on the length L of the region to be dimensional in the direction of the width of the parallel thin-walled plate structure and the length d of the dimensional structure, satisfying: l = (0.3 ~ 0.6) × d.

4. The metal additive manufacturing method for thin-walled plate-like structures according to claim 1, characterized in that, In S3, the number of V-shaped structures n is determined based on the length L of the region to be V-shaped in the direction of the width of the parallel thin-walled plate structure and the length d of the V-shaped structure, satisfying: int(3L / 2d)≤n≤ int(2L / d), where int() indicates that the operation takes integer values.

5. The method for metal additive manufacturing of thin-walled plate-like structures according to claim 1, characterized in that, The point-support structure is configured to satisfy the following: The cylindrical cavity is divided into multiple rectangular parallelepiped units of the same size; The cuboid units are stacked in multiple layers, with each layer having multiple cuboid units. Adjacent cuboid units share a common edge and four vertices. Construct a diagonal by connecting the top vertex of the upper surface with the farthest vertex of the lower surface, and select one of the diagonals as the trajectory for setting the rigid connecting rod.

6. The method for metal additive manufacturing of thin-walled plate-like structures according to claim 1 or 5, characterized in that, The height of the protruding plane of the rib-shaped support structure ranges from (0.05 ~ 0.5) × h, where h is the thickness of the thin-walled plate-like structure.

7. A thin-walled plate-like structure with low surface deformation, manufactured by the metal additive manufacturing method for thin-walled plate-like structures according to any one of claims 1-6, characterized in that, include: Thin-walled plate-like structure body, dimensional structure; The thin-walled plate-like structure body has two opposing planes that are parallel in both length and width directions; The dimensional structure has multiple parts, protruding from the opposite plane and symmetrically arranged on the opposite plane; The dimensional structure is designed according to the distribution pattern of the deformation-exceeding areas on a plane parallel to the length and width directions.

Images