Anti-cracking supporting structure and anti-cracking method for large-size thin-wall part

Abstract

The invention relates to the technical field of 3D printing, in particular to a large-size thin-wall part anti-cracking supporting structure and an anti-cracking method. The large-size thin-wall part anti-cracking supporting structure comprises a hollow barrel-shaped arc-shaped plate, a base plate and an arc-shaped chamfer; the hollow cylindrical arc-shaped plate is parallel to the height direction of the thin-wall part body and is fixedly connected with two adjacent planes parallel to the height direction of the thin-wall part body; the base plate is arranged at the bottom of the hollow cylindrical arc-shaped plate and the bottom of the thin-wall part body and fixedly connected with the hollow cylindrical arc-shaped plate and the thin-wall part body through arc-shaped chamfers. The internal stress of the thin-wall part body is transferred to the hollow barrel-shaped arc-shaped plate and the base plate through the hollow barrel-shaped arc-shaped plate and the arc-shaped chamfer, the stress is effectively dispersed, and the corner connecting position of the thin-wall part is directly connected with the hollow barrel-shaped arc-shaped plate through the connecting thin plate; internal stress at the corner connecting position of the thin-wall part is transferred to the hollow cylindrical arc-shaped plate; the defect that during 3D printing of the large-size thin-wall part, the stress at the corner connecting position is too large, and cracking is likely to happen is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a large-size thin-walled part anti-cracking support structure and an anti-cracking method. Background Art

[0002] In the 3D printing design and processing of large-sized thin-walled parts (e.g., thin-walled parts with a length and width of more than 1 meter), unlike ordinary parts, it is necessary to consider the possibility of cracking during the printing process due to the weak rigidity of the part body and the large heat input caused by the large size of the part. The cracking of large-sized thin-walled parts processed by existing technologies often occurs in stress concentration areas such as corners, which often leads to damage to the appearance and structure of thin-walled parts, making it difficult to meet design requirements. Summary of the invention

[0003] In view of the above analysis, the present invention aims to provide a large-size thin-walled parts anti-cracking support structure and anti-cracking method to solve at least one of the problems of stress concentration in corner areas and easy cracking in the processing of thin-walled parts in the prior art.

[0004] The purpose of the present invention is mainly achieved through the following technical solutions:

[0005] A large-size thin-walled part anti-cracking support structure, comprising:

[0006] Hollow cylindrical curved plates, base plates and curved chamfers;

[0007] The hollow cylindrical arc plate is arranged parallel to the height direction of the thin-walled part body, and is fixedly connected to two adjacent planes parallel to the height direction of the thin-walled part body;

[0008] The base plate is arranged at the bottom of the hollow cylindrical arc plate and the thin-walled component body, and is fixedly connected with the hollow cylindrical arc plate and the thin-walled component body through the arc chamfer.

[0009] Preferably, the side surface of the hollow cylindrical arc plate is provided with through grooves penetrating the upper and lower end surfaces of the hollow cylindrical arc plate, and the hollow cylindrical arc plate is arranged parallel to the height direction of the thin-walled part body;

[0010] One end face of the through slot is fixedly connected to the first side face of the thin-walled part body, and the other end face of the through slot is fixedly connected to the second side face of the thin-walled part body. The first side face and the second side face are two adjacent side faces arranged in parallel height directions in the thin-walled part.

[0011] Preferably, the inner diameter R of the hollow cylindrical arc plate is related to the main body length a of the thin-walled part body and the width b of the thin-walled part body, satisfying: R = (0.006 ~ 0.012) × |ab|, wherein, when the height of the thin-walled part is different at different locations, h takes the minimum value of the height of the thin-walled part body at various locations.

[0012] Preferably, the thickness h3 of the hollow cylindrical arc-shaped plate is related to the length a and the width b of the thin-walled part body, and satisfies: h3=(0.006-0.025)×|ab|.

[0013] Preferably, the thickness c of the connecting plate is related to the length a and the width b of the thin-walled part body, satisfying: c=(0.006-0.012)×|ab|, wherein when the heights of the thin-walled part are different at different locations, h takes the minimum height of the thin-walled part.

[0014] Preferably, the angle α between the connecting thin plate and the surface of the adjacent thin-walled part is in the range of 120° to 150°.

[0015] Preferably, the arc chamfer is a circular chamfer of R8 mm to R20 mm.

[0016] Preferably, the hollow cylindrical arc plate and the connecting thin plate are provided with powder cleaning holes near the base plate.

[0017] A method for preventing cracking of large-sized thin-walled parts, using the above-mentioned large-sized thin-walled parts anti-cracking support structure, comprising:

[0018] Based on the hollow cylindrical arc plate fixedly connected to both sides of the corner connection of the thin-walled part parallel to the height direction, the stress near the corner connection parallel to the height direction is dispersed to the hollow cylindrical arc plate;

[0019] Based on the arc chamfers set at the corner connections of thin-walled parts in the horizontal direction, the stress at the corner connections of thin-walled parts in the horizontal direction is evenly dispersed to the arc chamfers.

[0020] Preferably, the method for preventing cracking of large-sized thin-walled parts further comprises:

[0021] Based on the height direction setting parallel to the thin-walled parts, the connecting thin plates at the opposite ends are fixedly connected to the corner connections of the thin-walled parts and the inner arc surface of the hollow cylindrical arc plate, so as to transfer the internal stress of the corner connections of the thin-walled parts to the hollow cylindrical arc plate.

[0022] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0023] (1) The present invention transfers the internal stress of the thin-walled part body to the hollow cylindrical curved plate and the base plate through the hollow cylindrical curved plate and the curved chamfer, and effectively disperses the stress, thereby improving the defect of excessive stress and easy cracking at the corner connection during 3D printing of large-sized thin-walled parts in the prior art. The stress at the corner connection is less than 900MPa, preferably 700MPa to 880MPa.

[0024] (2) The present invention adjusts the inner diameter, thickness and other dimensions of the hollow cylindrical arc plate based on the size of the thin-walled parts, thereby adjusting the stress dispersion capacity of the hollow cylindrical arc plate according to the stress changes at the corner connections of the thin-walled parts, further improving the stress concentration of the thin-walled parts, and improving the stress tolerance of the anti-cracking support structure, which is helpful for processing thinner and larger thin-walled parts.

[0025] (3) The present invention directly connects the corner joints of thin-walled parts to the hollow cylindrical arc plate through connecting thin plates, thereby transferring the internal stress of the corner joints of thin-walled parts to the hollow cylindrical arc plate, further improving the defect of the prior art that the corner joints are prone to cracking due to excessive stress during 3D printing of large-sized thin-walled parts.

[0026] (4) The present invention adjusts the thickness of the connecting thin plate based on the size of the thin-walled parts, thereby adjusting the stress transfer capacity of the connecting thin plate according to the stress changes at the corner connections of the thin-walled parts, further improving the stress concentration of the thin-walled parts, and improving the stress tolerance of the anti-cracking support structure, which helps to process thinner and larger thin-walled parts.

[0027] (5) The present invention achieves efficient stress transfer of stress at the corner connections of thin-walled parts through the connecting thin plates by controlling the angle of the thin-walled parts relative to the thin-walled parts, further improves stress concentration in thin-walled parts, and improves the stress tolerance of the anti-cracking support structure, which helps to process thinner and larger thin-walled parts.

[0028] 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

[0029] 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.

[0030] Figure 1 A schematic diagram of the structure of a thin-walled part in one embodiment of the present invention;

[0031] Figure 2 for Figure 1 A local enlarged view of area A;

[0032] Figure 3 for Figure 2 BB surface cross-sectional view;

[0033] Figure 4 This is a schematic diagram of the installation structure of the hollow cylindrical arc plate and the connecting thin plate in one embodiment of the present invention;

[0034] Figure 5 It is a schematic structural diagram of a hollow cylindrical curved plate in one embodiment of the present invention;

[0035] Figure 6 A schematic diagram of the structure of a connecting sheet in one embodiment of the present invention;

[0036] Figure 7a This is a stress analysis diagram of a thin-walled part in Example 1 of the present invention;

[0037] Figure 7b A partial stress analysis diagram of a thin-walled part in Example 1 of the present invention;

[0038] Figure 8a This is a stress analysis diagram of a thin-walled part in Example 2 of the present invention;

[0039] Figure 8b A partial stress analysis diagram of a thin-walled part in Example 2 of the present invention;

[0040] Figure 9a This is a stress analysis diagram of a thin-walled part in Comparative Example 1 of the present invention;

[0041] Figure 9b This is a partial stress analysis diagram of a thin-walled part in Comparative Example 1 of the present invention;

[0042] Fig.10a This is a stress analysis diagram of a thin-walled part in Comparative Example 2 of the present invention;

[0043] Fig.10b This is a partial stress analysis diagram of a thin-walled part in Comparative Example 2 of the present invention;

[0044] Fig.11a This is a stress analysis diagram of a thin-walled part in Comparative Example 3 of the present invention;

[0045] Fig.11b This is a partial stress analysis diagram of a thin-walled part in Comparative Example 3 of the present invention;

[0046] Fig.12a This is a stress analysis diagram of a thin-walled part in Comparative Example 4 of the present invention;

[0047] Figure 12bThis is a partial stress analysis diagram of a thin-walled part in Comparative Example 4 of the present invention.

[0048] Reference numerals:

[0049] Thin-walled component body 1; hollow cylindrical arc plate 2; through groove 201; connecting thin plate 3; arc chamfer 4; powder cleaning hole 5; base plate 6. DETAILED DESCRIPTION

[0050] 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.

[0051] It should be noted that the large-size thin-walled part body of the present invention is a cuboid or a part of a cuboid, the thickness b of the thin-walled part body is much smaller than the length a and height h of the thin-walled part body, and the ratio of length, width to thickness is greater than 2. Figure 1 As shown, when the thin-walled part is a part of a rectangular parallelepiped, two long sides of the same length are provided among the four sides, and the height is h1; at the same time, two short sides of the same length are provided, and the height is h2.

[0052] On the one hand, the present invention discloses a large-sized thin-walled parts anti-cracking support structure, such as Figure 1-Figure 6 As shown, it includes: a hollow cylindrical arc plate 2, a base plate 6 and an arc chamfer 4;

[0053] The hollow cylindrical arc plate 2 is arranged parallel to the height direction of the thin-walled component body 1, and is fixedly connected to two adjacent planes parallel to the height direction side length of the thin-walled component body 1;

[0054] The base plate 6 is arranged at the bottom of the hollow cylindrical arc plate 2 and the thin-walled component body 1 , and is fixedly connected to the hollow cylindrical arc plate 2 and the thin-walled component body 1 through the arc chamfer 4 .

[0055] During implementation, during the 3D printing process, the internal stress of the thin-walled part body, especially near the edge and corner connections, is transferred to the hollow cylindrical curved plate through the hollow cylindrical curved plate 2, so that the area with the maximum stress of the thin-walled part is transferred from the edge and corner of the thin-walled part to the hollow cylindrical curved plate. At the same time, the arc chamfer 4 evenly disperses the stress at the bottom edge and corner connection of the thin-walled part and transfers it to the substrate; the hollow cylindrical curved plate is an arc shape, similar to the arc chamfer, and the stress of the two is not easy to concentrate, thereby avoiding cracking due to excessive stress and weak rigidity during the printing process of the part.

[0056] Compared with the prior art, the present invention partially transfers the internal stress of the thin-walled part body to the hollow cylindrical arc plate and the base plate through the hollow cylindrical arc plate and the arc chamfer, and effectively disperses the stress, thereby improving the defect of the prior art that the corner connections of large-sized thin-walled parts are prone to cracking due to excessive stress during 3D printing.

[0057] Specifically, the side surface of the hollow cylindrical arc plate 2 is provided with a through groove 201 which passes through the upper and lower end surfaces of the hollow cylindrical arc plate 2. The hollow cylindrical arc plate 2 is arranged parallel to the height direction of the thin-walled part body 1. One end surface of the through groove is fixedly connected to the first side surface of the thin-walled part body 1, and the other end surface of the through groove 201 is fixedly connected to the second side surface of the thin-walled part body 1. The first side surface and the second side surface are two adjacent side surfaces arranged parallel to the height direction in the thin-walled part.

[0058] Specifically, the inner diameter R of the hollow cylindrical arc plate is related to the length a, width b and height h of the thin-walled part body 1, and the relationship between a, b and h satisfies: R = (0.006~0.012)×|ab|, wherein when the heights of different parts of the thin-walled part are different, h takes the minimum value of the heights of the thin-walled part body.

[0059] When the value of a is between 600mm and 1300mm, the value of b is between 300mm and 600mm, and the value of R is between 3mm and 8mm.

[0060] Specifically, the thickness h3 of the hollow cylindrical arc-shaped plate is related to the length a, width b and height h of the thin-walled component body 1, and satisfies h3=(0.006-0.025)×|ab|;

[0061] When the value of a is between 600mm and 1300mm, the value of b is between 300mm and 600mm, and the value of h3 is between 5mm and 10mm.

[0062] It should be noted that stress is affected by the shape and volume of parts. At the same time, due to the increase in volume, the stress at the corner joints is accumulated. Even if the shape of the parts is the same, the stress at the corners of large-sized parts will be greater; at the same time, the greater the difference in width between the two adjacent planes at the connection of thin-walled parts (the greater the absolute value of the difference between length a and width b), the greater the accumulated stress at the connection due to the uneven heat dissipation rate; the larger the thick inner diameter of the hollow cylindrical arc plate, the greater the thickness of the hollow cylindrical arc plate, the smaller the stress load per unit area of ​​the outer arc plate, and the better the stress dispersion effect.

[0063] Preferably, when the hollow cylindrical arc plate is connected to the thin-walled part body 1, the following conditions are satisfied: the hollow cylindrical arc plate is symmetrically arranged about the right angle bisector axis at the corner connection of the thin-walled part body 1; and the tangent line on the arc of the hollow cylindrical arc plate at the connection between the hollow cylindrical arc plate and the thin-walled part body is perpendicular to the thin-walled part body.

[0064] It should be noted that the axial symmetry of the hollow cylindrical arc plate about the right angle bisector at the corner connection of the thin-walled part body 1 is conducive to the uniform transfer of stresses of two adjacent planes at the corner connection to the hollow cylindrical arc plate; the tangent of the hollow cylindrical arc plate on the arc of the hollow cylindrical arc plate at the connection between the hollow cylindrical arc plate and the thin-walled part body is perpendicular to the thin-walled part body, which can ensure that the stress on the inside and outside of the connection between the hollow cylindrical arc plate and the thin-walled part body is more evenly dispersed.

[0065] Compared with the prior art, the present invention adjusts the inner diameter, thickness and other dimensions of the hollow cylindrical arc plate based on the size of the thin-walled parts, thereby realizing the adjustment of the stress dispersion capacity of the hollow cylindrical arc plate according to the stress changes at the corner connections of the thin-walled parts, further improving the stress concentration of the thin-walled parts, and improving the stress tolerance of the anti-cracking support structure, which is conducive to the processing of thinner and larger thin-walled parts.

[0066] Preferably, the anti-cracking support structure further comprises a connecting thin plate 3;

[0067] The connecting thin plate 3 is arranged parallel to the height direction of the thin-walled component body 1 , one end of the connecting thin plate 3 is fixedly connected to the corner connection of the thin-walled component body 1 , and the other end is fixedly connected to the inner arc surface of the hollow cylindrical arc plate 2 .

[0068] During implementation, the internal stress at the corner connection of the thin-walled parts is transferred to the hollow cylindrical arc plate through the connecting thin plate 3 during the 3D printing process. The hollow cylindrical arc plate is an arc shape, and the stress is not easy to concentrate, which further improves the defect that the thin-walled parts are prone to cracking due to excessive stress and weak rigidity during the parts printing process.

[0069] Compared with the prior art, the present invention directly connects the corner connections of thin-walled parts with the hollow cylindrical arc plate through connecting thin plates, thereby transferring the internal stress of the corner connections of thin-walled parts to the hollow cylindrical arc plate, further improving the defect of the prior art that the corner connections are prone to cracking due to excessive stress during 3D printing of large-sized thin-walled parts.

[0070] Specifically, the thickness c of the connecting plate 3 is related to the length a, width b and height h of the thin-walled part body, and the relationship between c and a, b, h satisfies: c = (0.006 ~ 0.012) × |ab|, wherein, when the heights of different parts of the thin-walled part are different, h takes the minimum value of the heights of the thin-walled part.

[0071] For example, a is between 600 mm and 700 mm, b is between 300 mm and 400 mm, h is between 800 mm and 900 mm, and c is between 2 mm and 3 mm.

[0072] The value of a is between 700mm and 900mm, the value of b is between 400mm and 500mm, the value of h is between 900mm and 1200mm, and the value of c is between 3mm and 4mm;

[0073] The value of a is between 900mm and 1100mm, the value of b is between 400mm and 500mm, the value of h is between 1200mm and 1500mm, and the value of c is between 4mm and 5mm;

[0074] The value of a is between 1100mm and 1300mm, the value of b is between 500mm and 600mm, the value of h is between 1500mm and 1800mm, and the value of c is between 4mm and 6mm.

[0075] Compared with the prior art, the present invention adjusts the thickness of the connecting thin plates based on the size of the thin-walled parts, thereby realizing the adjustment of the stress transfer capacity of the connecting thin plates according to the stress changes at the corner connections of the thin-walled parts, further improving the stress concentration of the thin-walled parts, and improving the stress tolerance of the anti-cracking support structure, which is conducive to the processing of thinner and larger thin-walled parts.

[0076] Specifically, Figure 3 As shown, the angle α between the connecting plate 3 and the surface of the adjacent thin-walled part is controlled in the range of 120° to 150°, such as 120°, 122°, 125°, 127°, 130°, 132°, 135°, 137°, 138°, 140°, 142°, 144°, 145°, 147°, and 150°.

[0077] It should be noted that the widths of the two adjacent planes at the corner connections of thin-walled parts are different, resulting in uneven heat dissipation rates on both sides, affecting the magnitude and direction of the accumulated stress at the connection; the α value range is controlled between 120° and 150° to ensure that the stress at the corner connections of thin-walled parts is smoothly transferred to the hollow cylindrical arc plate through the connecting thin plate, and the residual stress at the corner connections of thin-walled parts is small.

[0078] Compared with the prior art, the present invention achieves efficient stress transfer of stress at the corner connections of thin-walled parts through connecting thin plates by controlling the angle of thin-walled parts relative to thin-walled parts, further improves stress concentration in thin-walled parts, and improves the stress tolerance of the anti-cracking support structure, which helps to process thinner and larger thin-walled parts.

[0079] Specifically, the arc chamfer 4 can be a circular chamfer of R8 mm to R20 mm, such as R8 mm, R10 mm, R12 mm, R14 mm, R15 mm, R16 mm, R17 mm, R18 mm, R19 mm, and R20 mm.

[0080] It should be noted that if the chamfer diameter is too small, it will be difficult to meet the stress dispersion requirements, and if the chamfer diameter is too large, it will far exceed the stress dispersion requirements, resulting in material waste and increased costs.

[0081] Specifically, the hollow cylindrical arc plate 2 and the connecting thin plate 3 are provided with powder cleaning holes 5 near the base plate.

[0082] Preferably, the powder cleaning hole 5 is elliptical, for example, the long diameter may be 3 mm to 5 mm and the short diameter may be 1 mm to 3 mm.

[0083] It should be noted that the elliptical powder cleaning hole has better permeability for irregular ash powder particles than the traditional circular powder cleaning hole, is less likely to be blocked, and can achieve better ash discharge.

[0084] Further preferably, in order to achieve better dust removal under vacuum or gravity, powder cleaning holes 5 are arranged at the bottom of the thin plate 3 and the hollow cylindrical arc plate 2, the long diameter of the powder cleaning holes 5 is parallel to the height direction of the thin-walled part body 1, and are arranged on the connecting thin plate 3 and the hollow cylindrical arc plate 2. The number of powder cleaning holes 5 on the connecting thin plate 3 is less than that on the hollow cylindrical arc plate 2, and the powder cleaning holes 5 of the connecting thin plate 3 are located at the lower part of the connecting thin plate 3.

[0085] During implementation, on the one hand, vacuum or gravity is used to realize ash extraction from the inside to the outside, and the amount of ash gradually increases from the inside to the outside. The number of powder cleaning holes 5 on the hollow cylindrical arc plate 2 is greater than that of the connecting thin plate 3, which is conducive to realizing powder cleaning from the inside to the outside; on the other hand, under the joint action of vacuum and gravity, the ash near the powder cleaning hole has a vertical downward movement and a horizontal movement toward the powder cleaning hole, and the combined movement is an oblique downward movement toward the powder cleaning hole. When using a powder cleaning hole whose long diameter is parallel to the height direction of the thin-walled part body 1, the ash is less likely to be blocked.

[0086] On the other hand, the present invention discloses a method for preventing cracking of large-sized thin-walled parts, using the above-mentioned anti-cracking support structure, comprising:

[0087] Based on the hollow cylindrical arc plate fixedly connected to both sides of the corner connection of the thin-walled part parallel to the height direction, the stress near the corner connection parallel to the height direction is dispersed to the hollow cylindrical arc plate;

[0088] Based on the arc chamfers set at the corner connections of thin-walled parts in the horizontal direction, the stress at the corner connections of thin-walled parts in the horizontal direction is evenly dispersed to the arc chamfers.

[0089] During implementation, during the 3D printing process, the internal stress of the thin-walled part body, especially near the edge and corner connections parallel to the height direction, is transferred to the hollow cylindrical curved plate through the hollow cylindrical curved plate 2, so that the area with the maximum stress of the thin-walled part is transferred from the edge and corner of the thin-walled part to the hollow cylindrical curved plate. At the same time, the arc chamfer 4 evenly disperses the stress at the bottom edge and corner connection of the thin-walled part and transfers it to the substrate; the hollow cylindrical curved plate is an arc, similar to the arc chamfer, and the stress of the two is not easy to concentrate, thereby avoiding cracking due to excessive stress and weak rigidity during the printing process of the part.

[0090] Compared with the prior art, the present invention partially transfers the internal stress of the thin-walled part body to the hollow cylindrical arc plate and the base plate through the hollow cylindrical arc plate and the arc chamfer, and effectively disperses the stress, thereby improving the defect of the prior art that the corner connections of large-sized thin-walled parts are prone to cracking due to excessive stress during 3D printing.

[0091] Preferably, the method for preventing cracking of large-sized thin-walled parts further comprises:

[0092] Based on the height direction setting parallel to the thin-walled parts, the connecting thin plates at the opposite ends are fixedly connected to the corner connections of the thin-walled parts and the inner arc surface of the hollow cylindrical arc plate, so as to transfer the internal stress of the corner connections of the thin-walled parts to the hollow cylindrical arc plate.

[0093] During implementation, the internal stress at the corner connection of the thin-walled parts is transferred to the hollow cylindrical arc plate through the connecting thin plate 3 during the 3D printing process. The hollow cylindrical arc plate is an arc shape, and the stress is not easy to concentrate, which further improves the defect that the thin-walled parts are prone to cracking due to excessive stress and weak rigidity during the parts printing process.

[0094] Compared with the prior art, the present invention directly connects the corner connections of thin-walled parts with the hollow cylindrical arc plate through connecting thin plates, thereby transferring the internal stress of the corner connections of thin-walled parts to the hollow cylindrical arc plate, further improving the defect of the prior art that the corner connections are prone to cracking due to excessive stress during 3D printing of large-sized thin-walled parts.

[0095] In order to further illustrate the present invention, the following examples and comparative examples are provided:

[0096] Example 1

[0097] This embodiment discloses a large-size thin-walled part anti-cracking support structure, comprising:

[0098] A hollow cylindrical curved plate 2, a base plate 6 and a curved chamfer 4;

[0099] The hollow cylindrical arc plate 2 is arranged parallel to the height direction of the thin-walled component body 1, and is fixedly connected to two adjacent planes parallel to the height direction side length of the thin-walled component body 1;

[0100] The base plate 6 is arranged at the bottom of the hollow cylindrical arc plate 2 and the thin-walled component body 1 , and is fixedly connected to the hollow cylindrical arc plate 2 and the thin-walled component body 1 through the arc chamfer 4 .

[0101] The thin-walled part is a part of a rectangular parallelepiped after oblique cutting. The main dimensions of the thin-walled part meet the following requirements: a = 1050 mm; b = 400 mm, h1 = 1560 mm; h2 = 1450 mm;

[0102] The side of the hollow cylindrical arc plate 2 is provided with a through groove 201 which passes through the upper and lower end surfaces of the hollow cylindrical arc plate 2. The hollow cylindrical arc plate 2 is arranged parallel to the height direction of the thin-walled part body 1. One end surface of the through groove is fixedly connected to the first side surface of the thin-walled part body 1, and the other end surface of the through groove 201 is fixedly connected to the second side surface of the thin-walled part body 1. The first side surface and the second side surface are two adjacent side surfaces arranged parallel to the height direction in the thin-walled part.

[0103] The hollow cylindrical arc plate is symmetrically arranged about the right angle bisector axis at the corner connection of the thin-walled component body 1.

[0104] The inner diameter R of the hollow cylindrical arc-shaped plate is 6.5 mm, and the thickness h3 of the hollow cylindrical arc-shaped plate is 10 mm.

[0105] The arc chamfer 4 is a R15 mm round chamfer.

[0106] The hollow cylindrical arc plate 2 is provided with a powder cleaning hole 5 near the base plate.

[0107] The powder cleaning hole 5 is elliptical, with a long diameter of 5 mm and a short diameter of 3 mm, and the long diameter is arranged parallel to the height direction of the thin-walled part.

[0108] This embodiment also discloses a method for preventing cracking of large-sized thin-walled parts, using the above-mentioned anti-cracking support structure, comprising:

[0109] Based on the hollow cylindrical arc plate fixedly connected to both sides of the corner connection of the thin-walled part parallel to the height direction, the stress near the corner connection parallel to the height direction is dispersed to the hollow cylindrical arc plate;

[0110] Based on the arc chamfers set at the corner connections of thin-walled parts in the horizontal direction, the stress at the corner connections of thin-walled parts in the horizontal direction is evenly dispersed to the arc chamfers.

[0111] According to the above parameter settings, the existing 3D printing technology is used to prepare thin-walled parts with the above anti-cracking support structure, such as Figure 1 As shown, it includes a thin-walled component body 1 and the above-mentioned anti-cracking support structure.

[0112] The simulation analysis results of stress at various locations of thin-walled parts are as follows: Figure 7a-Figure 7b As shown:

[0113] The stress at the corners of the part body is transferred to the hollow cylindrical arc plate to reduce the body stress and the risk of cracking. The stress near the part body is reduced to 850-880MPa.

[0114] Example 2

[0115] This embodiment discloses a large-sized thin-walled parts anti-cracking support structure, which differs from Embodiment 1 in that a connecting thin plate 3 is added, the inner diameter of the hollow cylindrical arc plate is R=8mm, and the thickness of the hollow cylindrical arc plate is h3=8mm.

[0116] The arc chamfer 4 is a R18 mm round chamfer.

[0117] The rest is the same as in Example 1, Figure 1 As shown, the anti-cracking support structure includes a connecting sheet 3;

[0118] The connecting thin plate 3 is arranged parallel to the height direction of the thin-walled component body 1 , one end of the connecting thin plate 3 is fixedly connected to the corner connection of the thin-walled component body 1 , and the other end is fixedly connected to the inner arc surface of the hollow cylindrical arc plate 2 .

[0119] The thickness of the connecting thin plate 3 is c=4 mm; the angle α between the connecting thin plate 3 and the surface of the adjacent thin-walled part is 135°.

[0120] The arc chamfer 4 is a R15 mm round chamfer.

[0121] The connecting thin plate 3 is provided with a powder cleaning hole 5 near the base plate.

[0122] The powder cleaning hole 5 is elliptical, with a long diameter of 5 mm and a short diameter of 3 mm, and the long diameter is arranged parallel to the height direction of the thin-walled part.

[0123] This embodiment also discloses a method for preventing cracking of large-sized thin-walled parts, using the above-mentioned anti-cracking support structure, comprising:

[0124] Based on the hollow cylindrical arc plate fixedly connected to both sides of the corner connection of the thin-walled part parallel to the height direction, the stress near the corner connection parallel to the height direction is dispersed to the hollow cylindrical arc plate;

[0125] Based on the arc chamfers set at the corner connections of thin-walled parts in the horizontal direction, the stress at the corner connections of thin-walled parts in the horizontal direction is evenly dispersed to the arc chamfers;

[0126] Based on the height direction setting parallel to the thin-walled parts, the connecting thin plates at the opposite ends are fixedly connected to the corner connections of the thin-walled parts and the inner arc surface of the hollow cylindrical arc plate, so as to transfer the internal stress of the corner connections of the thin-walled parts to the hollow cylindrical arc plate.

[0127] According to the above parameter settings, the existing 3D printing technology is used to prepare thin-walled parts with the above anti-cracking support structure, such as Figure 1 As shown, it includes a thin-walled component body 1 and the above-mentioned anti-cracking support structure.

[0128] The simulation analysis results of stress at various locations of thin-walled parts are as follows: Figure 8a-8b As shown:

[0129] The stress at the corners of the part body is transferred to the hollow cylindrical arc plate to reduce the body stress and cracking risk. The stress near the part body is reduced to 700-800MPa. Compared with the stress simulation analysis of Example 1 Figure 8b , the stress at the corner connection changes from the yellow area to the green area (about 700MPa).

[0130] Comparative Example 1

[0131] This comparative example discloses a large-size thin-walled parts anti-cracking support structure and anti-cracking method, which is different from Example 2 in that no hollow cylindrical arc plate and connecting thin plate are provided, and the rest is the same as Example 2.

[0132] The simulation analysis results of stress at various locations of thin-walled parts are as follows: Figure 9a-9b As shown:

[0133] The part body reaches its maximum at the corner connection, reaching about 1046MPa, which is much greater than the data in Example 2.

[0134] Comparative Example 2

[0135] This comparative example discloses a large-size thin-walled parts anti-cracking support structure and anti-cracking method. The difference from Example 2 is that the arc chamfer 4 is a R4 mm circular chamfer, which is much smaller than the range specified by the present invention. The rest is the same as Example 2.

[0136] The simulation analysis results of stress at various locations of thin-walled parts are as follows: Figure 10a-Figure 10b As shown:

[0137] The stress of the part body at the corner connection is not significantly different from that of Example 2, and the stress of the arc chamfer area is increased from 830 MPa in Example 2 to 960 MPa, which is much greater than that of Example 2.

[0138] Comparative Example 3

[0139] This comparative example discloses a large-sized thin-walled parts anti-cracking support structure and anti-cracking method. The difference from Example 2 is that c is 2 mm, which is much smaller than the range specified by the present invention. The rest is the same as Example 2.

[0140] The simulation analysis results of stress at various locations of thin-walled parts are as follows: Figure 11a-Figure 11b As shown:

[0141] The stress near the connection of the part body is increased from 700 MPa in Example 2 to 1000 MPa, which is much greater than that in Example 2.

[0142] Comparative Example 4

[0143] This comparative example discloses a large-size thin-walled parts anti-cracking support structure and anti-cracking method. The difference from Example 2 is that α is 85°, which is much smaller than the range specified by the present invention. The rest is the same as Example 2.

[0144] The simulation analysis results of stress at various locations of thin-walled parts are as follows: Figure 12a-12b As shown:

[0145] The stress near the connection of the part body is increased from 700 MPa (green) in Example 2 to 920 MPa (yellow), which is much greater than that in Example 2.

[0146] By comparing Example 1 to Example 2 and Comparative Example 1, it can be seen that the present invention partially transfers the internal stress of the thin-walled part body to the hollow cylindrical curved plate and the base plate through the hollow cylindrical curved plate and the curved chamfer, and effectively disperses the stress, thereby improving the defect of the corner connection of large-sized thin-walled parts in the prior art that the stress is too high and easy to crack during 3D printing; the corner connection of the thin-walled part is directly connected to the hollow cylindrical curved plate by connecting the thin plate, thereby realizing the transfer of the internal stress of the corner connection of the thin-walled part to the hollow cylindrical curved plate, further improving the defect of the corner connection of large-sized thin-walled parts in the prior art that the stress is too high and easy to crack during 3D printing. In the embodiment, the stress at the corner connection is less than 900MPa, preferably 700MPa to 880MPa.

[0147] By comparing Example 2 with Comparative Examples 1-4, it can be seen that the design parameters of the thin anti-cracking support structure within the specified range of the present invention are helpful to obtain the optimal effect.

[0148] 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 large-size thin-walled parts anti-cracking support structure, characterized in that: include: Hollow cylindrical curved plates, base plates and curved chamfers; The hollow cylindrical arc plate is arranged parallel to the height direction of the thin-walled component body, and is fixedly connected to two adjacent planes parallel to the height direction of the thin-walled component body; The base plate is arranged at the bottom of the hollow cylindrical arc plate and the thin-walled component body, and is fixedly connected with the hollow cylindrical arc plate and the thin-walled component body through the arc chamfer.

2. The anti-cracking support structure for large-sized thin-walled parts according to claim 1 is characterized in that: The side surface of the hollow cylindrical arc plate is provided with through grooves penetrating the upper and lower end surfaces of the hollow cylindrical arc plate, and the hollow cylindrical arc plate is arranged parallel to the height direction of the thin-walled part body; One end face of the through slot is fixedly connected to the first side face of the thin-walled part body, and the other end face of the through slot is fixedly connected to the second side face of the thin-walled part body. The first side face and the second side face are two adjacent side faces arranged in parallel height directions in the thin-walled part.

3. The anti-cracking support structure for large-sized thin-walled parts according to claim 2 is characterized in that: The inner diameter R of the hollow cylindrical arc plate is related to the main body length a of the thin-walled part body and the width b of the thin-walled part body, satisfying: R = (0.006 ~ 0.012) × |ab|, wherein, when the height of the thin-walled part is different at different locations, h takes the minimum value of the height of the thin-walled part body at various locations.

4. The anti-cracking support structure for large-sized thin-walled parts according to claim 3 is characterized in that: The thickness h3 of the hollow cylindrical arc-shaped plate is related to the length a of the thin-walled component body and the width b of the thin-walled component body, and satisfies: h3=(0.006-0.025)×|ab|.

5. The anti-cracking support structure for large-sized thin-walled parts according to claim 2 is characterized in that: The thickness c of the connecting plate is related to the length a and the width b of the thin-walled part body, and satisfies: c=(0.006-0.012)×|ab|, wherein when the heights of the thin-walled part are different at different locations, h takes the minimum height of the thin-walled part at different locations.

6. The anti-cracking support structure for large-sized thin-walled parts according to claim 2 is characterized in that: The angle α between the connecting thin plate and the surface of the adjacent thin-walled part is in the range of 120° to 150°.

7. The anti-cracking support structure for large-sized thin-walled parts according to claim 6 is characterized in that: The arc chamfer is a circular chamfer of R8 mm to R20 mm.

8. The anti-cracking support structure for large-sized thin-walled parts according to any one of claims 1 to 7, characterized in that: The hollow cylindrical arc plate and the connecting thin plate are provided with powder cleaning holes near the base plate.

9. A method for preventing cracking of large-sized thin-walled parts, characterized in that: The large-size thin-walled parts anti-cracking support structure according to any one of claims 1 to 8 is characterized in that the large-size thin-walled parts anti-cracking method comprises: Based on the hollow cylindrical arc plate fixedly connected to both sides of the corner connection of the thin-walled part parallel to the height direction, the stress near the corner connection parallel to the height direction is dispersed to the hollow cylindrical arc plate; Based on the arc chamfers set at the corner connections of thin-walled parts in the horizontal direction, the stress at the corner connections of thin-walled parts in the horizontal direction is evenly dispersed to the arc chamfers.

10. The method for preventing cracking of large-sized thin-walled parts according to claim 9, characterized in that: The method for preventing cracking of large-sized thin-walled parts also includes: Based on the height direction setting parallel to the thin-walled parts, the connecting thin plates at the opposite ends are fixedly connected to the corner connections of the thin-walled parts and the inner arc surface of the hollow cylindrical arc plate, so as to transfer the internal stress of the corner connections of the thin-walled parts to the hollow cylindrical arc plate.

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