Metal additive manufacturing method for thin-wall plate-shaped structure

Abstract

The invention relates to the technical field of metal additive manufacturing, in particular to a metal additive manufacturing method for a thin-wall plate-shaped structure, which comprises the following steps of: determining deformation exceeding areas on a group of opposite planes of the thin-wall plate-shaped structure as areas to be subjected to shape maintenance based on simulation analysis; determining the length d of the dimensional structure based on the width b of the thin-wall plate-shaped structure; determining the number n of the dimensional structures and the spacing l of the dimensional structures based on the distance L of the two regions to be subjected to dimensional shape, which are farthest from each other, in the width direction of the parallel thin-wall plate-shaped structure and the length d of the dimensional structures; the shape maintaining structure is a reinforced connecting structure protruding out of the opposite plane, and all points on the area to be subjected to shape maintaining can be integrally and fixedly connected. According to the method, the shape maintaining structure is designed through simulation analysis, external deformation resisting external force is applied to the area to be subjected to shape maintaining, the rigidity of the area to be subjected to shape maintaining is improved, and the problems that in the prior art, deformation in the thickness direction and the width direction is large, and the machining precision is poor in the thin-wall plate-shaped structure metal part additive manufacturing process are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal additive manufacturing, and in particular to a metal additive manufacturing method for a thin-walled plate-like structure. Background Art

[0002] Metal additive manufacturing is a technology that creates three-dimensional parts by adding materials layer by layer: special software is used to slice and layer the three-dimensional digital model of the parts, and the profile data of each section is obtained to serve as the heat source scanning trajectory. In the metal additive manufacturing process, the laser beam is controlled to melt the powder according to the scanning trajectory to complete the two-dimensional forming, and the three-dimensional model is finally manufactured by stacking layers. Compared with traditional manufacturing technology, additive manufacturing has the characteristics of short cycle, high efficiency, and high material utilization.

[0003] The stacking direction of the coordinate system of metal additive manufacturing is the Z axis, and the plane perpendicular to the Z axis is provided with the X and Y axes. For the processing of large thin-walled parts, due to the limited width of the additive manufacturing equipment, the length direction is often parallel to the Z axis, and the plane where the thickness and width of the thin-walled parts are located is perpendicular to the Z axis. During additive manufacturing processing: the XY direction will produce large deformation due to the accumulation of thermal stress layer by layer in additive manufacturing. The thinner the thin-walled structure and the larger the size in the XY direction, the more obvious the deformation of the plate structure (for example, parts with a ratio of length, width and thickness of the thin-walled structure greater than 50).

[0004] The prior art lacks an additive manufacturing method for thin-walled plate-shaped structural metal parts with small deformation in the XY direction and high processing accuracy. 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 structure metal parts in the prior art, such as large deformation in the XY direction and poor processing accuracy.

[0006] The purpose of the present invention is mainly achieved through the following technical solutions:

[0007] The present invention discloses a metal additive manufacturing method for a thin-walled plate-like structure, comprising:

[0008] S1: Based on simulation analysis, determine a group of areas on the thin-walled plate-like structure with excessive deformation on relative planes as areas to be shaped, wherein the relative planes are parallel to the length and width directions of the thin-walled plate-like structure at the same time;

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

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

[0011] The dimensional structure is a reinforcing connection structure protruding from the relative plane, and can integrally and fixedly connect all points on the area to be dimensionalized.

[0012] Preferably, S1 includes:

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

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

[0015] S103: selecting an area where the absolute value of the deformation is greater than or equal to a first limit value as the area to be shaped or selecting a set of multiple areas whose center distances are less than a second limit value as the area to be shaped;

[0016] S104: constructing a circumscribed quadrilateral of the region to be dimensioned on the plane where the X-axis and the Z-axis are located, the side lengths of which are parallel to the X-axis and the Z-axis, respectively, and taking the distance between the centers of the farthest circumscribed quadrilaterals as L.

[0017] Preferably, S103 includes:

[0018] S1031: Select the center of the area where the absolute value of the deformation is greater than or equal to the first limit value, and judge the distance between the center of the area where the absolute value of the deformation is greater than or equal to the first limit value and the center of the adjacent area where the absolute value of the deformation is greater than or equal to the first limit value, and a set of multiple areas whose center distances are less than the second limit value together constitute a to-be-shaped area;

[0019] S1032: The remaining regions whose absolute values ​​of deformation are greater than or equal to the first limiting value are separately constituted as a region to be shaped.

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

[0021] Preferably, in S3, the spacing l of the dimensional structures is determined based on the length L of the area to be dimensionalized 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 dimensional structures is determined based on the length L of the area to be shaped in the direction parallel to the width of the thin-walled plate-like structure and the length d of the dimensional structure, satisfying: int(3L / 2d)≤n≤int(2L / d), where int() means that the operation is an integer.

[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 arranged parallel to the Z-axis direction;

[0025] The point-shaped support structure is composed of a plurality of rigid connecting rods, one end of which is fixedly connected to the surface of the thin-walled plate-shaped structure, and the other end of which is fixedly connected to the inner surface of the rib-shaped support structure.

[0026] Preferably, the arrangement of the point-shaped support structure satisfies:

[0027] Dividing the cylindrical cavity into a plurality of cuboid units of the same size;

[0028] The cuboid units are stacked in multiple layers, each layer is provided with multiple cuboid units, and adjacent cuboid units have a common side and four vertices;

[0029] Connect the upper top surface vertex and the farthest lower top surface vertex to construct a diagonal line, and select one of the diagonals as the setting trajectory of 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-mentioned metal additive manufacturing method for thin-walled plate-like structures, characterized by comprising:

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

[0033] The thin-walled plate-like structure body is provided with two relative planes that are parallel in length and width directions;

[0034] The dimensional structure is provided with a plurality of dimensional structures, protruding from the relative plane and symmetrically arranged on the relative plane;

[0035] The dimensional structure is arranged according to the distribution law of the deformation exceeding standard area on the 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) The present invention determines the area to be shaped where the deformation exceeds the standard through simulation analysis, designs the dimensional structure based on the distance L, applies an external force to resist the deformation to the area to be shaped, thereby improving the stiffness of the area to be shaped, and solves the problems of large deformation in the thickness direction and width direction and poor processing accuracy in the additive manufacturing of thin-walled plate-like structural metal parts in the prior art.

[0038] (2) The present invention achieves comprehensive analysis and determination by determining the deformation of all regions through simulation analysis, thereby avoiding omission of items in the area to be dimensioned, and helping to improve the accuracy of analysis. At the same time, by judging the distance between adjacent areas of areas where the absolute value of the deformation is greater than or equal to the first limit value, the adjacent areas are collectively regarded as a dimensioned area, thereby reducing the workload of subsequent dimensioned area construction and improving analysis efficiency.

[0039] (3) The present invention avoids setting the dimensional structure in the entire area to be shaped by selecting a part of the area to be shaped according to the set rules. Compared with the solution in the prior art that sets the dimensional structure in the entire deformation area, the present invention reduces the number or total weight of the dimensional structure while ensuring the control of the deformation amount, greatly reduces the total weight and cost of the thin-walled plate structure, and is conducive to achieving lightweight.

[0040] (4) The present invention greatly improves the rigidity of the thin-walled plate-like structure and reduces the deformation by arranging a rib-like support structure and a point-like support structure with a rigid connecting rod within the dimensional structure.

[0041] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

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

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

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

[0046] Figure 4a It is a setting method for rigid connecting rods in point support structures;

[0047] Figure 4b It is another way to set the rigid connecting rod in the point support structure;

[0048] Figure 5 This is a simulation analysis diagram of a thin-walled plate structure without adding a dimensional structure;

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

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

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

[0052] Reference numerals:

[0053] Thin-walled plate-like structure body 1, dimensional structure 2, rib-like support structure 05, point-like support structure 06, and rigid connecting rod 061. DETAILED DESCRIPTION

[0054] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings 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 used to limit the scope of the present invention.

[0055] In one aspect, the present invention discloses a metal additive manufacturing method for a thin-walled plate-like structure, wherein the length-to-thickness ratio of the thin-walled plate-like structure and the width-to-thickness ratio of the thin-walled plate-like structure are both greater than 50, comprising:

[0056] S1: Based on simulation analysis, determine a group of areas on the thin-walled plate-like structure with excessive deformation on relative planes as areas to be shaped, wherein the relative planes are parallel to the length and width directions of the thin-walled plate-like structure at the same time;

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

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

[0059] The dimensional structure is a reinforcing connection structure protruding from the relative plane, and can integrally and fixedly connect all points on the area to be dimensionalized.

[0060] As an example, the thin-walled plate-like structure may be a thin-walled cuboid or a 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 planes, namely, a plane that is simultaneously parallel to the length and width directions, a plane that is simultaneously parallel to the thickness and width directions, and a plane that is simultaneously parallel to 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 simultaneously parallel to the length and width directions is much more serious than the other two, and in actual research, the thermal deformation on these two planes is often within a controllable range; therefore, the present invention focuses on controlling the thermal deformation of the plane that is simultaneously parallel to the length and width directions of the thin-walled plate-like structure.

[0062] Compared with the prior art, the present invention determines the area to be shaped where deformation exceeds the standard through simulation analysis, designs a dimensional structure based on the distance L, applies an external force to resist deformation to the area to be shaped, thereby improving the stiffness of the area 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-like structural metal parts in the prior art.

[0063] Specifically, S1 includes:

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

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

[0066] S103: selecting an area where the absolute value of the deformation is greater than or equal to a first limit value as the area to be shaped or selecting a set of multiple areas whose center distances are less than a second limit value as the area to be shaped;

[0067] S104: constructing a circumscribed quadrilateral of the region to be dimensioned on the plane where the X-axis and the Z-axis are located, the side lengths of which are parallel to the X-axis and the Z-axis, respectively, and taking the distance between the centers of the farthest circumscribed quadrilaterals as L.

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

[0069] Specifically, S103 includes:

[0070] S1031:

[0071] Select the center of the area where the absolute value of the deformation is greater than or equal to the first limit value, and judge the distance between the center of the area where the absolute value of the deformation is greater than or equal to the first limit value and the center of the adjacent area where the absolute value of the deformation is greater than or equal to the first limit value, and a set of multiple areas whose center distances are less than the second limit value together constitute a to-be-shaped area;

[0072] S1032: The remaining regions whose absolute values ​​of deformation are greater than or equal to the first limiting value are separately constituted as a region to be shaped.

[0073] Compared with the prior art, the present invention achieves comprehensive analysis and determination by determining the deformation of all regions through simulation analysis, avoids missing items in the area to be dimensioned, and helps to improve the accuracy of analysis. At the same time, by judging the distance between adjacent areas of areas whose absolute values ​​of deformation are greater than or equal to the first limit value, adjacent areas are collectively regarded as a dimensioned area, which reduces the workload of subsequent dimensioned area construction and improves analysis efficiency.

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

[0075] Preferably, d=45mm~70mm, which can be 45mm, 46mm, 48mm, 49mm, 50mm, 52mm, 53mm, 54mm, 55mm, 57mm, 58mm, 60mm, 61mm, mm, 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 structure. When the width b of the thin-walled plate structure is larger, it is matched with a smaller dimensional structure length; when the width b of the thin-walled plate structure is smaller, it is matched with a larger dimensional structure length, both of which are less economical.

[0077] Specifically, in S3, the spacing l of the dimensional structures is determined based on the length L of the area to be dimensionalized 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.

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

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

[0080] Preferably, n can be any integer between 1-6, for example 1, 2, 3, 4, 5 or 6.

[0081] Compared with the prior art, the present invention avoids setting the dimensional structure in the entire area to be shaped by selecting part of the area to be shaped according to set rules. Compared with the scheme in the prior art in which the dimensional structure is set in the entire deformation area, the number or total weight of the dimensional structure is reduced while ensuring the control of the deformation amount, which greatly reduces the total weight and cost of the thin-walled plate structure and is conducive to achieving lightweight.

[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 arranged parallel to the Z-axis direction;

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

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

[0086] Compared with the prior art, the present invention greatly improves the rigidity of the thin-walled plate-like structure and reduces the deformation by arranging a rib-like supporting structure and a point-like supporting structure with a rigid connecting rod in the dimensional 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-like structure in the plane direction of the Z axis, that is, the rib-like support structure 05 is of the same height as the thin-walled plate-like structure.

[0089] Preferably, the point support structure 06 is arranged according to Figure 4a-4b The lattice structure shown is set up:

[0090] Divide the cylindrical cavity into a plurality of cuboid units of the same size;

[0091] The cuboid units are stacked in multiple layers, each layer is provided with a plurality of cuboid units, and adjacent cuboid units have a common side and four vertices;

[0092] The vertices of the upper top surface are A, B, C, and D, and the corresponding vertices of the lower top surface at the projection position are A', B', C', and D'; connect the upper top surface vertices A, B, C, and D with the farthest lower top surface vertices A', B', C', and D' to construct diagonals, and select one of the diagonals as the setting trajectory of the rigid connecting rod.

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

[0094] It should be noted that the rigid connecting rods on the same layer are arranged in the same direction, which is conducive to ensuring uniform force on the thin-walled plate-like structure at the same height.

[0095] Further preferably, the arrangement trajectories of the rigid connecting rods of two adjacent layers are different, and the horizontal plane projections of the rigid connecting rods of adjacent layers are cross-arranged.

[0096] It should be noted that the horizontal plane projections of the rigid connecting rods of adjacent layers are cross-arranged, so that the X-axis coordinates of the connection points between different rigid connecting rods and the surface of the thin-walled plate-like structure are different, forming an orderly dislocation, thereby improving the uniformity of force on the surface of the thin-walled plate-like structure.

[0097] Preferably, the wall thickness of the rib-shaped support structure is ≥ the thickness of the thin-walled plate-shaped structure;

[0098] The diameter of the rigid connecting rod is ≤ the thickness of the thin-walled plate structure.

[0099] It should be noted that the wall thickness of the rib-like support structure ≥ the thickness of the thin-walled plate-like structure is conducive to improving the rigidity of the rib-like support structure; the diameter of the rigid connecting rod ≤ the thickness of the thin-walled plate-like structure can avoid excessive stress on the connection between the surface of the thin-walled plate-like structure and the rigid connecting rod, causing reverse deformation.

[0100] Specifically, the simulation analysis software may 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-mentioned additive manufacturing method, comprising:

[0102] A thin-walled plate-like structure body 1 and a dimensional structure 2; the thin-walled plate-like structure body is provided with two relative planes that are parallel in length and width directions;

[0103] There are multiple dimensional structures 2, which protrude from the relative plane and are symmetrically arranged on the relative plane;

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

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

[0106] Specifically, the number n of dimensional structures satisfies: int(3L / 2d)≤n≤int(2L / d), wherein int() represents an integer operation, and L is the distance between the two farthest areas to be dimensionalized 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 a thin-walled plate-like structure, such as Figure 1 As shown, the body of 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: Use magics simulation analysis to determine the areas where the deformation exceeds the standard on a set of relative planes of the thin-walled plate-like structure as the areas to be shaped, and the relative planes are parallel to the length and width directions of the thin-walled plate-like structure at the same time;

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

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

[0112] S103: selecting an area where the absolute value of the deformation is greater than or equal to a first limit value as the area to be shaped or selecting a set of multiple areas whose center distances are less than a second limit value as the area to be shaped;

[0113] S1031: selecting the center of the region where the absolute value of the deformation is greater than or equal to the first limit value and the center of the adjacent region where the absolute value of the deformation is greater than or equal to the first limit value to perform distance judgment, and a set of multiple regions where the center distance is less than the second limit value together constitutes a region to be shaped;

[0114] S1032: The remaining regions where the absolute values ​​of the deformation amounts are greater than or equal to the first limiting value are separately formed into a region to be shaped;

[0115] S104: Construct a circumscribed quadrilateral of the region to be dimensioned on the plane where the X-axis and the Z-axis are located, with the side lengths parallel to the X-axis and the Z-axis respectively. The distance between the centers of the farthest circumscribed quadrilaterals is taken as L. Figure 5 Know that L≈420mm.

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

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

[0118] The dimensional structure is a reinforcing connection structure protruding from the relative plane, and can integrally and fixedly connect all points on the area to be dimensionalized.

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

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

[0121] Point support structure 06 Figure 4a-4b The lattice structure shown is set up:

[0122] Divide the cylindrical cavity into multiple cubic units of the same size of 20 mm × 20 mm × 20 mm;

[0123] The cubic units are stacked in multiple layers, each layer is provided with multiple cubic units, and adjacent cubic units have a common side and four vertices;

[0124] The vertices of the upper top surface are A, B, C, and D, and the corresponding vertices of the lower top surface at the projection position are A', B', C', and D'; connect the upper top surface vertices A, B, C, and D with the farthest lower top surface vertices A', B', C', and D' to construct diagonals, and select one of the diagonals as the setting trajectory of the rigid connecting rod.

[0125] The setting tracks of the rigid connecting rods in the same layer are the same. The setting tracks of the rigid connecting rods in the upper and lower adjacent layers are different, and the horizontal plane projections of the rigid connecting rods in the adjacent layers are cross-set.

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

[0127] A thin-walled plate-like structure body 1 and a dimensional structure 2; the thin-walled plate-like structure body is provided with two relative planes that are parallel in length and width directions;

[0128] There are multiple dimensional structures 2, which protrude from the relative plane and are symmetrically arranged on the relative plane;

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

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

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

[0132] Example 2

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

[0134] S1: Use magics simulation analysis to determine the areas where the deformation exceeds the standard on a set of relative planes of the thin-walled plate-like structure as the areas to be shaped, and the relative planes are parallel to the length and width directions of the thin-walled plate-like structure at the same time;

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

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

[0137] S103: selecting an area where the absolute value of the deformation is greater than or equal to a first limit value as the area to be shaped or selecting a set of multiple areas whose center distances are less than a second limit value as the area to be shaped;

[0138] S1031: selecting the center of the region where the absolute value of the deformation is greater than or equal to the first limit value and the center of the adjacent region where the absolute value of the deformation is greater than or equal to the first limit value to perform distance judgment, and a set of multiple regions where the center distance is less than the second limit value together constitutes a region to be shaped;

[0139] S1032: The remaining regions where the absolute values ​​of the deformation amounts are greater than or equal to the first limiting value are separately formed into a region to be shaped;

[0140] S104: Construct a circumscribed quadrilateral of the region to be dimensioned in the plane where the X-axis and the Z-axis are located, whose sides are parallel to the X-axis and the Z-axis respectively. The distance between the centers of the farthest circumscribed quadrilaterals is taken as L. It is known from simulation analysis that L≈450 mm.

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

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

[0143] The dimensional structure is a reinforcing connection structure protruding from the relative plane, and can integrally and fixedly connect all points on the area to be dimensionalized.

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

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

[0146] Point support structure 06 Figure 4a-4b The lattice structure shown is set up:

[0147] Divide the cylindrical cavity into multiple cubic units of the same size of 20 mm × 20 mm × 20 mm;

[0148] The cubic units are stacked in multiple layers, each layer is provided with multiple cubic units, and adjacent cubic units have a common side and four vertices;

[0149] The vertices of the upper top surface are A, B, C, and D, and the corresponding vertices of the lower top surface at the projection position are A', B', C', and D'; connect the upper top surface vertices A, B, C, and D with the farthest lower top surface vertices A', B', C', and D' to construct diagonals, and select one of the diagonals as the setting trajectory of the rigid connecting rod.

[0150] The setting tracks of the rigid connecting rods in the same layer are the same. The setting tracks of the rigid connecting rods in the upper and lower adjacent layers are different, and the horizontal plane projections of the rigid connecting rods in the adjacent layers are cross-set.

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

[0152] A thin-walled plate-like structure body 1 and a dimensional structure 2; the thin-walled plate-like structure body is provided with two relative planes that are parallel in length and width directions;

[0153] There are multiple dimensional structures 2, which protrude from the relative plane and are symmetrically arranged on the relative plane;

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

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

[0156] The simulation analysis results show that the absolute value of the maximum deformation after adding the dimensional structure is significantly lower than that 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=5mm, does not satisfy: d=(0.05~0.5)×b, and the rest is the same as Example 1.

[0159] The simulation analysis results are as follows Figure 7 As shown, when d is 5 mm, the absolute value of the maximum deformation is 1.02 mm, which is much larger than that in 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, n does not satisfy: int(3L / 2d)≤n≤int(2L / d), and the rest is the same as Example 1.

[0162] The 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 larger than that in Example 1.

[0163] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A metal additive manufacturing method for thin-walled plate-like structures, characterized in that: include: S1: Based on simulation analysis, determine a group of areas on the thin-walled plate-like structure with excessive deformation on relative planes as areas to be shaped, wherein the relative planes are parallel to the length and width directions of the thin-walled plate-like structure at the same time; S2: Determine the length d of the dimensional structure based on the width b of the thin-walled plate-like structure; S3: determining the number n of dimensional structures and the spacing l of dimensional structures based on the distance L between the two farthest distanced areas to be dimensionalized in the direction parallel to the width of the thin-walled plate-like structure and the length d of the dimensional structure; The dimensional structure is a reinforcing connection structure protruding from the relative plane, and can integrally and fixedly connect all points on the area to be dimensionalized.

2. The metal additive manufacturing method for thin-walled plate-like structures according to claim 1, characterized in that: S1 includes: S101: During simulation analysis, the same three-dimensional coordinate system as that of 3D printing is established, with the stacking direction and the length direction of the thin-walled part as the Z axis, the thickness direction as the Y axis, and the width direction as the X axis; S102: Based on the simulation analysis, intuitively obtain deformation information of each region on the plane of the thin-walled plate-like structure that is parallel to the length and width directions of the thin-walled plate-like structure according to the color; S103: selecting an area where the absolute value of the deformation is greater than or equal to a first limit value as the area to be shaped or selecting a set of multiple areas whose center distances are less than a second limit value as the area to be shaped; S104: constructing a circumscribed quadrilateral of the region to be dimensioned on the plane where the X-axis and the Z-axis are located, the side lengths of which are parallel to the X-axis and the Z-axis, respectively, and taking the distance between the centers of the farthest circumscribed quadrilaterals as L.

3. A metal additive manufacturing method for thin-walled plate-like structures according to claim 2, characterized in that: S103 includes: S1031: Select the center of the area where the absolute value of the deformation is greater than or equal to the first limit value, and judge the distance between the center of the area where the absolute value of the deformation is greater than or equal to the first limit value and the center of the adjacent area where the absolute value of the deformation is greater than or equal to the first limit value, and a set of multiple areas whose center distances are less than the second limit value together constitute a to-be-shaped area; S1032: The remaining regions whose absolute values ​​of deformation are greater than or equal to the first limiting value are separately constituted as a region to be shaped.

4. The metal additive manufacturing method for thin-walled plate-like structures according to claim 1, characterized in that: In S2, the length d of the dimensional structure is determined based on the width b of the thin-walled plate-like structure to satisfy: d = (0.05-0.5) × b.

5. 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 structures is determined based on the length L of the area to be dimensionalized 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.

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

7. The metal additive manufacturing method for thin-walled plate-like structures according to any one of claims 1 to 6, characterized in that: The dimensional structure includes a rib-shaped support structure and a point-shaped 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 arranged parallel to the Z-axis direction; The point-shaped support structure is composed of a plurality of rigid connecting rods, one end of which is fixedly connected to the surface of the thin-walled plate-shaped structure, and the other end of which is fixedly connected to the inner surface of the rib-shaped support structure.

8. The metal additive manufacturing method for thin-walled plate-like structures according to claim 7, characterized in that: The arrangement of the point support structure satisfies: Dividing the cylindrical cavity into a plurality of cuboid units of the same size; The cuboid units are stacked in multiple layers, each layer is provided with multiple cuboid units, and adjacent cuboid units have a common side and four vertices; Connect the upper top surface vertex and the farthest lower top surface vertex to construct a diagonal line, and select one of the diagonals as the setting trajectory of the rigid connecting rod.

9. The metal additive manufacturing method for thin-walled plate-like structures according to claim 8, characterized in that: The height of the protruding plane of the rib-like support structure ranges from (0.05 to 0.5)×h, where h is the thickness of the thin-walled plate-like structure.

10. 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 to 9, characterized in that: include: Thin-walled plate-like structure, dimensional structure; The thin-walled plate-like structure body is provided with two relative planes that are parallel in length and width directions; The dimensional structure is provided with a plurality of dimensional structures, protruding from the relative plane and symmetrically arranged on the relative plane; The dimensional structure is arranged according to the distribution law of the deformation exceeding standard area on the plane parallel to the length and width directions.

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