CN118481874A - Space inclined lattice structure, screen mesh and manufacturing method thereof - Google Patents
Space inclined lattice structure, screen mesh and manufacturing method thereof Download PDFInfo
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- CN118481874A CN118481874A CN202410708127.2A CN202410708127A CN118481874A CN 118481874 A CN118481874 A CN 118481874A CN 202410708127 A CN202410708127 A CN 202410708127A CN 118481874 A CN118481874 A CN 118481874A
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/97—Rocket nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/64—Treatment of workpieces or articles after build-up by thermal means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
- B22F10/66—Treatment of workpieces or articles after build-up by mechanical means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
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- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
- B33Y40/20—Post-treatment, e.g. curing, coating or polishing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/54—Leakage detectors; Purging systems; Filtration systems
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- Chemical & Material Sciences (AREA)
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- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
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Abstract
The invention relates to a space inclined lattice structure, a screen and a manufacturing method thereof, belongs to the technical field of additive manufacturing, and solves the problems that a traditional lattice structure product cannot realize a small aperture and is low in product functionality. A spatially tilted lattice structure is compressed to deform and reduce the pore size. The manufacturing approach of the space inclined lattice structure is according to the actual application demand, utilize CAD software of computer aided design to design the three-dimensional model of the lattice structure first; then manufacturing a lattice structure through an additive manufacturing technology; and then carrying out integral or local plastic deformation on the lattice structure, and reducing the aperture to achieve the function of meeting the lattice structure product. The manufacturing method can effectively reduce the aperture of the lattice structure and improve the function of the product.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to a space inclined lattice structure, a screen and a manufacturing method thereof.
Background
A lattice structure is a three-dimensional structure having periodic repeating units, which is widely used in various fields due to its light weight, high strength, high rigidity and versatility. Conventional electronic structure manufacturing methods include casting, forging, conventional subtractive processing and the like. These methods have limitations in manufacturing lattice structures of complex configurations, such as long manufacturing cycle, high cost, complex process steps, and limited shaping configurations.
With the development of additive technology, the fabrication of lattice structures becomes more efficient and flexible. Additive technology can produce components with complex geometries, including lattice structures, providing new possibilities for the production of complex lattice structures. However, the particle size range of powder used in manufacturing lattice structures by using additive manufacturing technology is usually 10-300 μm, when the average particle size of powder is 50 μm, the hole which can be completely cleaned by the powder is 300 μm, and the blocking powder in the channel can block the hole, so that a certain difficulty exists in manufacturing micro-pore size.
The additive manufacturing technology is used as an advanced manufacturing technology for converting digital design into a solid product, and also provides a new mode for a screen manufacturing method.
Screens, also known as wire meshes, are mesh products that have a strict mesh size and are capable of classifying the particles of objects, unlike ordinary mesh products. At present, the screen is widely applied to various fields of agriculture, industry, science and technology, national defense, daily life and the like. The mesh size varies from a few millimeters to tens of micrometers. The screen generally has extremely high compressive strength, and is not easy to deform, shrink, extend and the like. The design of the mesh is regular and accurate, and has reliable filtering precision. It is also required to have high temperature resistance, chemical corrosion resistance, good wear resistance and formability.
Conventional screen manufacturing methods mainly include braiding, stretching, welding, and the like. However, these methods have certain limitations in manufacturing screens with high open cell content, complex structures and multiple functions.
Similarly, powder particle sizes used in the manufacture of screens using additive manufacturing techniques are typically in the range of 10 to 300 μm, and when the average particle size of the powder is 50 μm, the pores that the powder can completely clear are 300 μm, and the blocking powder in the channels can also clog the pores, making the manufacture of fine pore size screens somewhat difficult.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a space-inclined lattice structure, a screen and a manufacturing method thereof, which are used for solving at least one of the following technical problems: (1) The traditional lattice structure and the products thereof such as the screen are difficult to realize the micro aperture industrially, and the functionality of the products is not high; (2) It is difficult to realize a micro-aperture lattice structure and large-area manufacture of products such as a screen; (3) The lattice local controllability and the large-span aperture lattice integrated manufacturing are difficult to realize; (4) Complex lattice structures with small apertures and products such as screens are difficult to realize; (5) The micro-aperture lattice structure and the products thereof, such as a screen mesh, have low production efficiency and high cost.
The invention provides a space inclined lattice structure, which comprises at least one space inclined structural unit, wherein the space inclined structural unit comprises an upper rectangular frame, a lower rectangular frame, spherical nodes and connecting rods;
the upper rectangular frame and the lower rectangular frame are rectangular with side length of a multiplied by b mm; the end parts of the adjacent sides of the rectangle are connected through spherical nodes;
The spherical nodes corresponding to the upper rectangular frame and the lower rectangular frame are connected through inclined connecting rods;
The projections of the upper rectangular frame and the lower rectangular frame are not overlapped.
Further, the connecting rods between the spherical nodes corresponding to the upper rectangular frame and the lower rectangular frame are not perpendicular to the rectangular planes of the upper rectangular frame and the lower rectangular frame.
Further, the lengths of the connecting rods between the spherical nodes corresponding to the upper rectangular frame and the lower rectangular frame are the same, and/or the diameters of the connecting rods are the same.
Further, the upper rectangular frame and the lower rectangular frame are arranged in parallel.
Further, the diameter of the connecting rod is 0.1-5 mm.
Further, the inclination angle of the connecting rod is more than 0 ℃ and less than 90 ℃;
further, the straight line distance between the connecting rods on four sides of the upper layer and four sides of the lower layer is more than or equal to 0.2mm.
Further, the lattice structure is formed by a structure formed by transversely and sequentially arranging a plurality of repeating units of the space-inclined structural units, or a structure formed by longitudinally laminating a plurality of repeating units of the space-inclined lattice structural units in a transverse and sequentially arranging mode.
On the other hand, the invention provides a screen, which is based on the space inclined lattice structure, and the aperture of the lattice structure is reduced by plastic deformation after the space inclined lattice structure is manufactured by an additive manufacturing technology, so that the micro-aperture screen is obtained.
Further, the method for manufacturing the screen comprises the following steps:
s1: according to the actual application requirement, designing a three-dimensional model of the lattice structure according to any one of claims 1-8 by utilizing computer-aided design (CAD) software;
s2: manufacturing a lattice structure by an additive manufacturing technology;
S3: and (3) plastically deforming the lattice structure manufactured in the step (S2) to enable the lattice structure to be integrally or locally plastically deformed, and reducing the aperture of the lattice structure.
Compared with the prior art, the invention has at least one of the following beneficial effects:
1) The space inclined lattice structure provided by the invention comprises a space inclined structural unit, wherein the space inclined structural unit is connected with 4 inclined connecting rods between spherical nodes corresponding to the upper layer and the lower layer, the end parts of the connecting rods are connected with the edges of the upper layer and the lower layer through the spherical nodes, and the connecting rods are obliquely arranged between the upper layer and the lower layer, namely, the connecting rods between the spherical nodes corresponding to the upper layer and the lower layer are not perpendicular to the rectangular planes of the upper layer and the lower layer, and when the space inclined lattice structure is subjected to plastic deformation, the connecting rods can compress the aperture of the lattice structure, so that the purpose of micro aperture is achieved.
2) The invention can adjust the aperture size of the space inclined lattice structure by adjusting and controlling the parameters of the connecting rod diameter, length, rod spacing, spherical node size, plastic deformation compression amount and the like of the space inclined structural unit. The space inclined lattice structure is manufactured by additive manufacturing technology and then subjected to plastic deformation to reduce the aperture of the lattice structure, so that the micro-aperture screen can be prepared.
3) The lattice structure, the screen and the manufacturing method provided by the invention can realize the manufacturing of the micro-aperture lattice structure in industry and enhance the functionality of products. The traditional lattice structure manufacturing method is difficult to realize micro aperture, and the additive manufacturing technology is used as an advanced manufacturing technology, so that a new mode is provided for the lattice structure manufacturing method. The grain size range of powder used in manufacturing lattice structures by using additive manufacturing technology in industry is usually between 10 and 300 mu m, when the average grain size of powder is 50 mu m, the hole which can be completely cleared out by the powder is 300 mu m, and the blocking powder in the channel can block the pore diameter, so that a certain difficulty exists in manufacturing micro-pore-diameter lattice structures. The present invention provides a spatially tilted lattice structure which is deformable and reduces the pore size after being compressed. The invention also provides a manufacturing method of the space inclined lattice structure, which comprises the steps of manufacturing the space inclined lattice structure through additive materials, and then plastically deforming the whole or part of the space inclined lattice structure through plastic deformation technology, so that the aperture of the lattice structure is further reduced, and the purpose of realizing the micro aperture is achieved.
4) The lattice structure, the screen and the manufacturing method provide possibility for realizing large-area manufacturing of the micro-aperture lattice structure. Conventional additive manufacturing of micro-pore lattice structures requires the use of extremely fine powders to achieve the desired precision and pore size. However, limited by additive manufacturing techniques, generally only small parts can be handled. Currently, there are some additive manufacturing techniques that can manufacture large-sized devices, such as Fused Deposition Modeling (FDM) and Selective Laser Sintering (SLS). But these techniques may suffer from problems such as accuracy and porosity control in the fabrication of micro-pore lattice structures. The invention provides a method for manufacturing a lattice structure, which does not need to specially select extremely fine powder, but adopts powder with the particle size commonly used in industry, manufacturing the lattice structure through additive manufacturing, then plastically deforming the whole or part of the lattice structure on the basis of the lattice structure through plastic forming technology, and further reducing the pore size of the lattice structure.
5) The lattice structure, the screen and the manufacturing method provided by the invention can realize the local controllable and large-span aperture lattice integrated manufacturing of the lattice. According to the invention, on the basis of a special lattice structure suitable for deformation, the material-increasing manufacturing technology and the plastic forming technology are combined to manufacture the lattice structure, the lattice structure suitable for deformation provides convenience for the plastic forming technology, and the lattice structure can be designed in a locally controllable manner through integral forming or local forming, so that the integral manufacturing of the large-span aperture lattice structure is possible.
6) The lattice structure, the screen and the manufacturing method provided by the invention can realize a complex lattice structure with a small aperture. Conventional lattice structure fabrication techniques have certain limitations in terms of implementing complex structures and multi-functional designs. The invention provides a special space inclined lattice structure, the rods of the structure are not vertically or horizontally arranged in space, but are inclined at a certain angle, the structure is suitable for deformation, the invention combines additive manufacturing technology and plastic forming technology to manufacture the lattice structure, the lattice structure suitable for deformation provides convenience for the plastic forming technology, and through integral forming or partial forming, the customizing design can be carried out at different parts of the lattice structure, and the functionality and complexity of the lattice structure are increased.
7) The lattice structure, the screen and the manufacturing method of the micro-aperture lattice structure provided by the invention have the advantages of high production efficiency and low cost. The invention provides a lattice structure manufacturing method, which does not need to specially select expensive superfine powder, but adopts powder with common grain diameter in common industry, does not need to select special expensive additive manufacturing equipment, only needs the common additive manufacturing equipment, can manufacture a lattice structure with micro size by combining additive manufacturing and plastic forming technology, has higher efficiency in additive manufacturing of the powder with common grain diameter, can effectively save time, and has simple operation, low cost and high production efficiency.
In the invention, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 (a) is a schematic front view of a three-dimensional model of a space-oblique lattice structure according to the present invention;
FIG. 1 (b) is a schematic top view of a three-dimensional model of a space-oblique lattice structure according to the present invention;
FIG. 1 (c) is an isometric view of a schematic three-dimensional model of a spatially-tilted lattice structure according to the present invention;
FIG. 2 (a) is a schematic view of a section of a cylindrical lattice structure according to the present invention;
fig. 2 (b) is a schematic top view of a cylindrical lattice structure according to the present invention;
FIG. 3 is a schematic view of the overall plastic molding provided by the present invention;
FIG. 4 is a schematic view of a partial plastic forming provided by the present invention;
FIG. 5 (a) is a schematic view of a tangential plane structure of a cylindrical lattice structure according to the present invention;
Fig. 5 (b) is a schematic top view of a cylindrical lattice structure according to the present invention;
FIG. 6 (a) is a schematic diagram of a tangential plane structure of a central lattice edge entity according to the present invention;
FIG. 6 (b) is a schematic diagram illustrating a top view of the lattice structure of the central lattice edge entity according to the present invention;
FIG. 7 is a schematic view of a screen apparatus on a surface tension tank provided by the present invention.
Reference numerals:
1-pressure; 2-a heating zone; 3-an induction heating wire; 4-wrap; 5-a base; 6-a cylindrical lattice structure; 7-a cylindrical lattice structure; 8-fixing the section; 9-screening; 10-a liquid acquisition channel; 11-liquid outlet.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
The traditional lattice structure product is difficult to realize micro aperture industrially, and the product has low functionality; large-area manufacture of micro-aperture lattice structures is difficult to realize; the lattice local controllability and the large-span aperture lattice integrated manufacturing are difficult to realize; complex lattice structures with small apertures are difficult to realize; the micro-aperture lattice structure has low production efficiency and high cost. The invention discloses a special space inclined lattice structure, which is suitable for deformation, and also provides a manufacturing method of the space inclined lattice structure, the method is characterized in that a space inclined lattice structure is manufactured through additive manufacturing, and then the whole or partial plastic deformation is performed through plastic deformation technology, so that the aperture of the lattice structure is further reduced, and the purpose of realizing the micro aperture is achieved.
On one hand, the invention discloses a space inclined lattice structure, wherein a three-dimensional model is shown in figure 1, and is formed by combining connecting rods with the diameter of 0.1-5 mm, and the rods are connected by spherical nodes to form a three-dimensional lattice structure; the units of the lattice structure are of a space inclined structure, and the structure can deform after being compressed, so that convenience is provided for plastic deformation; the diameter of the spherical node is slightly larger than the diameter of the rod.
In particular, a spatially inclined structure means that its elements (such as rods, wires or filaments) are not vertically or horizontally aligned in space but inclined at an angle, the mesh of the screen is not square or rectangular, but diamond or other shape, and these shapes are inclined at an angle.
Further, the three-dimensional model of the space tilting structure is shown in fig. 1, and comprises at least one space tilting structure unit, wherein the space tilting structure unit comprises an upper rectangular frame, a lower rectangular frame, spherical nodes and connecting rods;
the upper rectangular frame and the lower rectangular frame are rectangular with side length of a multiplied by b mm; the end parts of the adjacent sides of the rectangle are connected through spherical nodes;
The spherical nodes corresponding to the upper rectangular frame and the lower rectangular frame are connected through inclined connecting rods;
The projections of the upper rectangular frame and the lower rectangular frame are not overlapped.
Specifically, the values of a and b may be the same or different.
Further, the connecting rods between the spherical nodes corresponding to the upper rectangular frame and the lower rectangular frame are not perpendicular to the rectangular planes of the upper rectangular frame and the lower rectangular frame.
Further, the lengths of the connecting rods between the spherical nodes corresponding to the upper rectangular frame and the lower rectangular frame are the same, and/or the diameters of the connecting rods are the same.
Further, the upper rectangular frame and the lower rectangular frame are arranged in parallel.
Further, the diameter of the connecting rod is 0.1-5 mm.
Further, the inclination angle of the connecting rod is more than 0 ℃ and less than 90 ℃;
further, the straight line distance between the connecting rods on four sides of the upper layer and four sides of the lower layer is more than or equal to 0.2mm.
Further, the lattice structure is formed by a structure formed by transversely and sequentially arranging the repeating units of a plurality of space inclined structural units, or is formed by longitudinally stacking a structure formed by transversely and sequentially arranging the repeating units of a plurality of space inclined lattice structural units, and when the lattice structure is longitudinally stacked, projections of the rectangular frames at the lower layer are overlapped.
Furthermore, the layer structure of the lattice structure is formed by sequentially arranging a plurality of space inclined structural units on the same plane, wherein the height is l 0 mm, and the maximum side length is more than or equal to 400mm.
Furthermore, the lattice structure is formed by overlapping a plurality of layers of the lattice structure, the height of each layer is l 0 mm, the height after compression is l 1 mm, and the maximum volume of the lattice structure is more than or equal to 0.8mx0.8mx1.25 m. .
Further, the aperture of the lattice structure is 1-200 mu m, and the porosity control range is 10% -90%, so that the requirements of different application scenes are met; the material of the lattice structure is different according to different product requirements, and the lattice structure comprises stainless steel and titanium alloy.
It should be noted that, the space inclined structure unit is connected by 4 inclined connecting rods between the spherical nodes corresponding to the upper layer and the lower layer, the shape formed by two adjacent connecting rods and two rods between the two connecting rods is a hole of a lattice structure, and the aperture of the lattice structure can be controlled by adjusting the side lengths of the rectangular frames of the upper layer and the lower layer and the diameters of the connecting rods.
Specifically, porosity is the ratio of the pore area in cross section, which can be measured by sectioning, to the total cross section. The porosity is related to the size of a plurality of technical indexes such as the transmission efficiency, the light weight, the weight and the like of the lattice structure, and is generally calculated according to specific requirements; the porosity of the lattice structure can be controlled by adjusting design parameters of the lattice structure, such as pore size, pore shape and grid layout, thereby providing a customized solution for different industrial applications.
Specifically, when the hole is square or irregular, the aperture of the lattice structure is the equivalent diameter of the hole, i.e. the diameter of the area of the equivalent circle of square or irregular. The aperture and the pore shape of the lattice structure can be designed according to the requirements of lattice products, such as the aperture or the pore shape according to the size and the shape of the products to be filtered by the screen.
Specifically, the particle distribution curve of the product can be obtained through equipment such as a particle size analyzer, the main particle size range is determined, and then the proper sieve pore diameter is selected; the shape of the holes of the screen can be determined according to the shape of the particles of the filtration product, for example, circular holes are suitable for screening round or spherical particles, which can ensure that the particles pass through the screen holes when standing or rolling on the screen surface; the long holes are suitable for sieving long or flat particles, and can ensure that the particles pass through the sieve holes when standing sideways; square holes are suitable for screening square or irregularly shaped particles, but the screening accuracy may be lower.
The lattice structure can be used for additive manufacturing of various products. In one possible embodiment, a screen for use in the sweat cooling at the rocket engine nozzle is manufactured, the sweat cooling technique being a method of reducing the surface temperature by forming a cooling film on the solid surface, the screen playing a critical role in this process. By precisely controlling the distribution and flow of the coolant, the screen mesh helps to achieve efficient thermal management, ensuring performance and reliability of the rocket engine nozzle under extreme operating conditions. The screen is typically positioned inside the rocket engine nozzle, near the outlet of the combustion chamber, so that it can be cooled as the hot gas passes through the nozzle. In order to meet the cooling requirement, a pore size of 50 μm was set, the pore shape was elongated, and the porosity was 50%.
In one possible embodiment, a screen for a surface tension tank is manufactured, which screen is required to filter the gas in the gas-liquid mixture during the satellite or rocket orbit, to supply the fuel liquid to the engine, and to meet this requirement, a pore size of 5 μm, a pore shape of an elongated shape, and a porosity of 60% are provided.
Specifically, the lattice structure material can be stainless steel, titanium alloy, high-temperature plastic or the like. The choice of material depends on the application requirements of the lattice structure, cost effectiveness, mechanical properties requirements and the feasibility of the post-treatment.
In one possible embodiment, stainless steel is selected as the lattice structure material in order to meet the low cost and high strength requirements of the lattice structure; in one possible implementation, to meet the corrosion resistance and light weight requirements of the lattice structure, titanium alloy is selected as the lattice structure material; in one possible embodiment, the high temperature plastic is selected as the lattice structure material in order to meet the conventional filtration requirements of the lattice structure.
On the other hand, the invention discloses a screen, which is obtained by manufacturing the space inclined lattice structure through an additive manufacturing technology and then carrying out plastic deformation to reduce the aperture of the lattice structure.
The manufacturing method of the screen mesh firstly utilizes the flexibility of additive manufacturing to stack materials layer by layer to manufacture blanks with complex lattice structures, such as cylindrical, central lattice edge entity and other lattice structure blanks, and for convenience of understanding, the cylindrical lattice structure schematic diagram provided by the invention can be referred to in fig. 2 (a) and 2 (b); fig. 5 (a) and fig. 5 (b) are schematic structural diagrams of a cylindrical lattice structure provided by the present invention; fig. 6 (a) and fig. 6 (b) are schematic structural diagrams of lattice structures of the central lattice edge entity provided by the present invention. Then further carrying out plastic deformation on the lattice structure blank, changing the porosity of the lattice, reducing the pore size, regulating and controlling the lattice space structure, and meeting the functional requirement of the micro-pore lattice structure, and specifically comprising the following steps:
s1: according to the actual application requirement, designing a three-dimensional model of the space inclined lattice structure by utilizing computer-aided design (CAD) software;
s2: manufacturing a lattice structure by an additive manufacturing technology;
S3: and (3) plastically deforming the lattice structure manufactured in the step (S2) to enable the lattice structure to be integrally or locally plastically deformed, and reducing the aperture of the lattice structure to meet the functional requirement of the lattice structure product.
S4: and (3) performing performance detection on the lattice structure manufactured in the step (S3), wherein the performance detection comprises pore diameter, porosity, appearance size and the like, so as to ensure that the lattice structure meets the use requirements.
S5: surface treatment and finishing.
Further, in step S1, factors to be considered when designing the three-dimensional model of the lattice structure by using CAD software include a unit structure of the lattice structure, an aperture, a rod diameter, a rod length, a rod spacing, and a spherical node size, and parameters are set according to these factors, and then are converted into a digital model; the change of the pore size before and after deformation needs to be considered when the simulation iteration plastic deformation is used for setting parameters.
Specifically, when designing a three-dimensional model of a lattice structure by using CAD software, a three-dimensional model of a spatial oblique structure is designed first, and a specific structure can be referred to fig. 1 as a schematic diagram of the three-dimensional model of the spatial oblique structure, and then parameters are set: rod diameter, rod length, rod clearance, spherical node diameter, model size, etc., and then generating a three-dimensional model based on these parameters.
Specifically, the diameters of all connecting rods are the same and are 0.1-5 mm, the diameters of the rods can be adjusted according to the requirements of target apertures, a cylinder can be created in software by setting the diameters of the rods, the diameter of the cylinder is the diameter of the rod, the height of the cylinder is the length of the rod, and the length of the rod can be adjusted by adjusting the height of the cylinder. A sphere is created with a diameter that is the diameter of the spherical node, which is slightly larger than the diameter of the rod. The ball is placed at the intersection of the rod members, ensuring that the ball is connected to the ends of the rod members. The bars are then arranged, ensuring that there is sufficient clearance between them when the bars are arranged, which can be achieved by moving the bars or adjusting the position of the spheres if necessary to adjust the bar clearance.
Specifically, the change of pore sizes before and after deformation needs to be considered when the parameters are set by using simulation iteration plastic deformation. As variations in pore size directly affect the performance of the lattice structure. After the first wheel compression plastic deformation simulation, the pressing-down amount can be determined through the limiting compression amount, if the result shows that the pores are too large, the rod diameter can be increased, and/or the pore spacing can be reduced, and/or the spherical node diameter can be increased, and if the pores after compression are uneven, the rod length and the rod gap need to be modified to meet the pore diameter requirement of a target area.
Specifically, in step S2, the additive manufacturing technology includes laser selective sintering, laser powder feeding cladding, electron beam melting, binder jet printing forming, and arc additive technology; parameters of the additive manufacturing technology include laser power, scanning speed and molten pool size, and optimization is required according to the performance requirements of the lattice structure.
In one possible embodiment, to meet the strength and filtering properties of the lattice structure, the laser power is set at 400W, the scanning speed is 800mm/s, and the size of the molten pool is 150-300 μm for additive manufacturing of titanium alloy screens. In one possible embodiment, in order to meet the automatic perspiration performance of the lattice structure, the lattice structure pores form stepped pores from top to bottom in sequence, so that enough liquid flows. In one possible embodiment, increasing the rod diameter may reduce the porosity when the strength is dominant.
Further, the lattice structure is manufactured by using additive manufacturing technology, and the specific operation steps are as follows:
1) Designing a lattice structure, and designing a three-dimensional model of the lattice structure by utilizing CAD software;
2) And (3) material selection: selecting a suitable additive powder;
3) Selecting proper additive manufacturing equipment, and setting parameters of additive manufacturing according to the selected materials and equipment requirements;
4) And manufacturing a lattice structure.
Specifically, before plastic deformation is performed between the steps S2 and S3, a heat treatment or other post treatment is required to be performed on the manufactured lattice structure to cure and strengthen the lattice structure sample, so that the strength and stability of the lattice structure are improved, and the lattice structure can bear larger stress and pressure.
Further, heat treatment is a technique for improving the properties of a metal material through a heating and cooling process. Internal stress generated by the material during the manufacturing process can be eliminated or reduced by heat treatment, which helps to prevent cracking during subsequent plastic deformation; the heat treatment can also improve the plasticity of the material, so that the material is easier to plastically deform, thereby reducing tool wear and energy consumption in the processing process.
The specific steps of heat treatment of the lattice structure include:
1) Determining a partial area of the lattice structure which needs to be subjected to heat treatment according to the use requirement of the lattice structure and the performance target;
2) Designing a proper induction coil according to the shape and the size of the area to be heat treated, wherein the design of the coil ensures that concentrated and uniform heating can be provided for the target area;
3) Setting parameters in the heat treatment process, including heating temperature, heating rate, heat preservation time, cooling rate and the like, wherein the parameters are determined according to the heat treatment characteristics of the lattice structure material;
4) Heat treatment is performed with a heating device.
Further, other post-treatments include grinding and polishing treatments and coating techniques. The grinding and polishing treatment is used for improving the surface roughness of the lattice structure, removing processing traces, improving the dimensional accuracy and obtaining better optical performance; the coating technology is to apply one or more layers of materials on the surface of the lattice structure to improve the wear resistance, corrosion resistance and adhesion resistance.
Further, in step S3, the plastic deformation is a molding area with reasonable design according to the functional requirement of the lattice structure product, and the whole plastic molding or the partial plastic molding can be performed on different parts of the lattice structure. For example, to manufacture many small screens over a limited area, it is only necessary to manufacture one large screen and plastic shape it in its entirety, and then achieve the same by covering the non-screen locations, in order to simplify the process. For example, in order to facilitate installation of the screen, a fixed position with a certain width needs to be left on the periphery of the screen, and when the screen is manufactured, only the center (non-fixed position) of the screen needs to be partially compressed.
Plastic forming may be achieved by hot press forming, hot stretching, etc. The plastic forming comprises the following specific steps:
1) According to the structural and functional requirements of the lattice structure, a reasonable forming area is designed, and the whole plastic forming or the partial plastic forming is realized;
2) Placing the lattice structure manufactured by the additive manufacturing technology into plastic forming equipment;
3) Parameters such as temperature, pressure, heat preservation time and the like of plastic forming are set, so that the lattice structure is ensured to have enough fluidity and deformability in the plastic forming process, and proper pressure and forming force can be provided, the lattice structure can completely fill a die, and a required sieve pore structure is obtained;
4) Selecting a proper forming process, such as hot press forming or hot stretching, and determining an optimal forming mode according to the size, thickness and material properties of the lattice structure;
5) The plastic forming is carried out by a selected process, and in the plastic forming process, the lattice structure is deformed into a lattice structure with fine meshes according to the set temperature and pressure.
In one possible implementation, the whole lattice is compressed and deformed in one direction, the whole lattice is put on a lower platform of a press with a heating furnace, and the upper platform of the press acts on the part to cause the whole lattice structure to be plastically deformed;
In a possible implementation mode, the whole multi-directional compression deformation is carried out, a lattice structural member is placed on an upper platform and a lower platform of a press, the structural member is heated by sleeving corresponding induction coils on the outer layer of a target area, when the temperature reaches a material plastic deformation area, the induction coils are removed, and orderly loading is carried out in multiple directions simultaneously or according to a certain sequence, so that the plastic deformation of the target area is carried out, and an ideal aperture lattice structure is obtained;
In one possible implementation mode, the lattice structure is locally compressed and deformed, the lattice structure is placed on an upper platform and a lower platform of a press, the structure is heated by sleeving corresponding induction coils on the outer layer of a target area, when the temperature reaches a material plastic deformation easy area, the upper platform applies acting force to the lattice structure, rapid deformation of the target area is achieved, and an ideal aperture lattice structure is obtained.
In one possible embodiment, the entire lattice structure is put on a stretcher with a heating furnace and the lattice structure is held at both ends so that the entire lattice structure is plastically deformed.
Further, in the plastic deformation process, the material temperature and pressure parameters of different areas are controlled so as to realize high-quality controllable molding.
In one possible embodiment, the target pore diameter is 50 μm, the blank of the manufactured titanium alloy material, the cylindrical and space-inclined lattice structure is integrally formed by plastic forming, the integral unidirectional compression is formed by plastic forming, the cylinder inner diameter is 50mm, the cylinder outer diameter is 200mm, the cylinder height (screen thickness) is 6mm, taking the minimum space-inclined structural unit as an example: the upper layer and the lower layer are both composed of square frames with the side length of 0.4 multiplied by 0.4 mm; the height between the upper layer and the lower layer is 0.4mm, the initial equivalent diameter of the pore is 0.12mm, the printed lattice structure is put into plastic forming equipment, the temperature is 700 ℃, the pressing amount is 58%, the pressure maintaining time is 30min, and the lattice structure can be deformed into the lattice structure with the pore diameter of about 50 mu m according to the set temperature and pressure in the plastic forming process.
In one possible embodiment, the target pore diameter is 5 μm, the manufactured lattice structure blank of titanium alloy material, cylindrical, space inclined lattice structure is locally plastic formed, local unidirectional compression is plastic formed, the cylindrical diameter is 50mm, the column height (screen thickness) is 5mm, taking the smallest space inclined structural unit as an example: the upper layer and the lower layer are both composed of square frames with the side length of 0.5 multiplied by 0.5 mm; the height between the upper layer and the lower layer is 0.5mm, the initial equivalent diameter of the pore is 0.05mm, the printed lattice structure is put into plastic forming equipment, the temperature is 700 ℃, the pressing amount is 90%, the pressure maintaining time is 30min, and the lattice structure can be deformed into the lattice structure with the pore diameter of about 5 mu m according to the set temperature and pressure in the plastic forming process.
Preferably, the heating furnace is a vacuum heating furnace, and high-temperature oxidation can be avoided.
Further, in step S5, after plastic forming, the obtained lattice structure product may have a certain surface roughness and dimensional deviation, so that surface treatment and finish machining are required to improve the surface quality and dimensional accuracy of the lattice structure.
Further, the surface treatment includes polishing, spraying, and the like. The polishing process can remove the surface roughness, so that the aperture and the flatness of the lattice structure are more consistent; the spray coating process may use a surface coating technique to add one or more layers of material to the surface to increase the wear resistance, corrosion resistance and adhesion resistance of the lattice structure. The finish machining can be performed in a CNC machining mode and the like, and accurate size measurement and adjustment are performed on the lattice structure to ensure that the lattice structure meets specific requirements.
Compared with the prior art, the manufacturing method of the space inclined lattice structure suitable for deformation and the product thereof, such as a screen, adopts a process combining additive manufacturing lattice structure and plastic forming, can effectively improve the manufacturing efficiency and quality of the micro-aperture lattice structure, and reduces the production cost. The obtained product has wide application in the fields of aviation, aerospace, navigation, rail transit or medical products, and the products comprise filter screens, surface tension storage tanks, engine parts, cooling devices and the like.
The lattice structure, the screen and the method of manufacturing the same according to the present invention will be further described below by way of specific examples.
Example 1
A space inclined lattice structure is formed by combining rods with the diameter of 0.1mm, the rods are connected by spherical nodes, the diameter of each spherical node is slightly larger than that of each rod and is 0.15mm, and a three-dimensional lattice structure is formed; the units of the lattice structure are of a space inclined structure; the specific structure can refer to fig. 1 (a), 1 (b) and 1 (c) which are schematic diagrams of three-dimensional models of space inclined structures. The spatial tilting structure is deformable after being compressed. Taking the smallest space-inclined building block as an example: the upper layer and the lower layer are both composed of square frames with the side length of 0.4 multiplied by 0.4 mm; the height between the upper layer and the lower layer is 0.4mm, and the spherical nodes corresponding to the upper layer and the lower layer are connected by 4 rods inclined at a certain angle theta to form an inclined cube frame, wherein the inclination angle is theta=45 ℃.
The lattice structure is a radially nested and axially stacked multilayer structure, and is formed by sequentially arranging a plurality of space inclined structural units on the same plane, wherein the height of the lattice structure is 0.4mm; the lattice structure is a ring with the inner diameter of 50mm, the outer diameter of 200mm and the thickness of 6mm, and is formed by overlapping layers of 15 layers of lattice structures, the height of each layer of space inclined structural unit is 0.4mm, and the total thickness of the lattice structure is 6mm.
Application example 1
The spatially tilted lattice structure provided in example 1 was applied to the manufacture of a screen for use in the cooling of sweats at the nozzle of a rocket engine. The screen mesh is made of titanium alloy, is cylindrical in structure, has a specific shape shown in fig. 2 (a) and 2 (b), has an inner diameter of 50mm, an outer diameter of 200mm and a height (screen mesh thickness) of 6mm, and has the effects of sucking liquid above the screen mesh into the lower part through lower ignition, and guiding the liquid into a combustion chamber by utilizing a micropore runner to complete cooling and supplying functions. The mesh has a plurality of elongated irregular shapes, so the target pore diameter is 50 mu m of pore equivalent diameter, the porosity is 50%, and the cooling and fuel supply effects can be satisfied.
The specific manufacturing method of the lattice structure is as follows:
Step one: according to the actual application requirement, designing a three-dimensional model of the space inclined lattice structure by utilizing computer-aided design (CAD) software; the model is the tube-shape, and the section of thick bamboo internal diameter is 50mm, and section of thick bamboo external diameter 200mm, and the section of thick bamboo height is 6mm, and follow-up needs whole compression plastic forming, through pushing down the process, lattice structure can torsional deformation downwards, reduces the sieve mesh structure, and lattice structure height can reduce after general whole compression. The initial equivalent diameter of the pore is 0.12mm, and the size of the equivalent diameter before and after deformation is designed based on the compression quantity; the finite element simulation shows that the pressing amount is 3.5mm and the compression amount is 58%, so that the rod diameters on the space inclined lattice are gradually stuck together, and the pore size is controlled at 50 mu m.
Step two: the lattice structure is fabricated by additive manufacturing techniques. Titanium alloy powder (particle diameter about 50 μm) is selected as lattice structure material, and is manufactured by adopting laser sintering additive manufacturing technology, wherein the laser power is set to 400W, the scanning speed is 800mm/s, and the size of a molten pool is 150-300 μm. And manufacturing a lattice structure blank by stacking materials layer by layer, and removing the titanium alloy powder.
Step three: carrying out vacuum heat treatment on the manufactured blank, wherein the method comprises the following specific steps of:
a. Solution treatment: and (3) placing the blank into a vacuum heat treatment furnace, heating to 1030 ℃ at a speed of 16 ℃/min, preserving heat for 2 hours, fully dissolving solute in the alloy into solid solution, and then rapidly cooling.
B. after solution treatment, the material is rapidly cooled and quenched to form a martensitic structure, thereby improving the hardness and strength of the material.
C. Tempering: tempering the quenched blank to eliminate internal stress produced by quenching and to raise the toughness and plasticity of the material. Tempering temperature and time will vary depending on the delivery conditions, typically at 550 c, and air or water cooled after 8 hours.
Step four: and integrally compression plastic forming the lattice structure blank. As shown in fig. 3, the blank after heat treatment is put on a base 5 of a plastic forming device, a pressure 1 applies pressure to the blank, an induction heating wire 3 is wrapped by a wrapper 4 and integrally heats a heating area 2, the heating temperature is controlled to be 700 ℃, the pressing amount is 58%, and the pressure maintaining time is 30min. It can be seen from the figure that the lattice structure is compressed as a whole. In the plastic forming process, the space-inclined lattice structure is compressed and deformed, and the final pore diameter is reduced to 50 mu m.
Performance test: the aperture of the manufactured product is 50 mu m, the specific size is a cylinder with the inner diameter of the cylinder being 50mm, the outer diameter of the cylinder being 200mm and the height of the cylinder being 2.5mm, thereby meeting the functional requirements of the target product.
Application example 2
The difference from application example 1 is that only the part with the width of 50mm around the inner ring of the cylindrical structure is partially compressed, the partial compression schematic diagram is shown in fig. 4, the blank after heat treatment is put on the base 5 of the plastic forming equipment, the pressure 1 applies pressure to the blank, the induction heating wire 3 is wrapped by the wrapper 4 and the heating area 2 is partially heated, the heating temperature is controlled at 700 ℃, the pressing amount is 58%, and the dwell time is 30min. From the figure it can be seen that the lattice structure is locally compressed.
Performance test: the aperture of the manufactured product at the local compression position is 50 mu m, the specific size is that the inner diameter of the cylinder is 50mm, the outer diameter of the cylinder is 200mm, the height of the cylinder of the compression part is 2.5mm, and the height of the cylinder of the non-compression part is 6mm, so that the functional requirement of the target product is met.
Example 2
A space inclined lattice structure is formed by combining rods with the diameter of 0.2mm, the rods are connected by spherical nodes, the diameter of each spherical node is slightly larger than that of each rod and is 0.25mm, and a three-dimensional lattice structure is formed; the units of the lattice structure are of a space inclined structure; specific structures can refer to 1 (a), 1 (b) and 1 (c) as three-dimensional model schematic diagrams of space inclined structures. The spatial tilting structure is deformable after being compressed. Taking the smallest space-inclined building block as an example: the upper layer and the lower layer are both composed of square frames with the side length of 0.5 multiplied by 0.5 mm; the height between the upper layer and the lower layer is 0.5mm, and the spherical nodes corresponding to the upper layer and the lower layer are connected by 4 rods inclined at a certain angle theta to form an inclined cube frame, wherein the inclination angle is theta=60 ℃.
The lattice structure is a radially telescopic and axially stacked multilayer structure, and is formed by sequentially arranging a plurality of space inclined structural units on the same plane, wherein the height is 0.5mm, and the shape of the lattice structure isThe disc-shaped structure is formed by overlapping 10 layers of lattice structures layer by layer, the height of each layer of space inclined structure unit is 0.5mm, and the total thickness of the lattice structure is 5mm.
Application example 3
The spatially tilted lattice structure provided in example 2 was applied to screen manufacture on a surface tension reservoir of an attitude orbit control system on a satellite. Fig. 7 is a schematic diagram of a screen device on a surface tension tank, which is provided by the invention, and the device strengthens the surface tension by utilizing the complex microstructure of the screen 9, absorbs liquid into a liquid acquisition channel 10, and finally the liquid is discharged through a liquid outlet 11 to realize gas-liquid separation. The screen is made of titanium alloy, has a disc-shaped (cylindrical) structure, has a specific shape shown in fig. 5 (a) and 5 (b), has a cylinder diameter of 50mm, a cylinder height (screen thickness) of 5mm, and has a plurality of elongated irregular screen pores, so that the target pore diameter is 5 mu m, the porosity is 60%, and the gas in a gas-liquid mixture can be filtered to provide fuel liquid for an engine in the satellite or rocket in-orbit process.
The specific manufacturing method of the lattice structure is as follows:
Step one: according to the actual application requirement, designing a three-dimensional model of the space inclined lattice structure by utilizing computer-aided design (CAD) software; the model is discoid, and the cylinder diameter is 50mm, and the post height is 5mm, and follow-up needs whole compression plastic forming, through pushing down the process, lattice structure can torsional deformation downwards, reduces the sieve mesh structure, and lattice structure height can reduce after the whole compression generally. The initial equivalent diameter of the pore is 0.05mm, and the size of the pore before and after deformation of the equivalent diameter is designed based on the compression quantity; the finite element simulation shows that the pressing amount is 4.5mm and the compression amount is 90%, so that the rod diameters on the space inclined lattice are gradually stuck together, and the pore size is controlled at 5 mu m.
Step two: the lattice structure is fabricated by additive manufacturing techniques. Titanium alloy powder (particle diameter about 50 μm) is selected as lattice structure material, and is manufactured by adopting laser sintering additive manufacturing technology, wherein the laser power is set to 400W, the scanning speed is 800mm/s, and the size of a molten pool is 150-300 μm. And manufacturing a lattice structure blank by stacking materials layer by layer, and removing the titanium alloy powder.
Step three: carrying out vacuum heat treatment on the manufactured blank, wherein the method comprises the following specific steps of:
a. Solution treatment: and (3) placing the blank into a vacuum heat treatment furnace, heating to 1030 ℃ at a speed of 16 ℃/min, preserving heat for 2 hours, fully dissolving solute in the alloy into solid solution, and then rapidly cooling.
B. after solution treatment, the material is rapidly cooled and quenched to form a martensitic structure, thereby improving the hardness and strength of the material.
C. Tempering: tempering the quenched blank to eliminate internal stress produced by quenching and to raise the toughness and plasticity of the material. Tempering temperature and time will vary depending on the delivery conditions, typically at 550 c, and air or water cooled after 8 hours.
Step four: and integrally compression plastic forming the lattice structure blank. As shown in fig. 3, the blank after heat treatment is put on a base 5 of a plastic forming device, a pressure 1 applies pressure to the blank, an induction heating wire 3 is wrapped by a wrapper 4 and integrally heats a heating area 2, the heating temperature is controlled to be 700 ℃, the pressing amount is 90%, and the pressure maintaining time is 30min. It can be seen from the figure that the lattice structure is compressed as a whole. In the plastic forming process, the space inclined lattice structure is compressed and deformed, and the final pore diameter is reduced to 5 mu m.
Performance test: the aperture of the manufactured product is 5 mu m, the specific size is a cylinder with the diameter of a cylinder surface of 50mm and the height of the cylinder of 0.5mm, and the functional requirement of the target product is met.
Application example 4
The difference from application example 3 is that only the center of the cylindrical structure is partially compressed at the cylindrical portion having a diameter of 40 mm.
Performance test: the aperture of the manufactured product at the local compression position is 5 mu m, the specific size is that the diameter of a cylindrical surface is 50mm, the column height of a compression part is 0.5mm, and the height of an uncompressed part is 5mm, so that the functional requirement of the target product is met.
Application example 5
The difference from the application example 3 is that the solid parts are more around the lattice structure cylinder, the solid parts are printed together during additive manufacturing, the lattice structure is only integrally compressed during plastic forming, as shown in the lattice structure schematic diagrams of the central lattice edge solid shown in fig. 6 (a) and 6 (b), the lattice structure comprises a cylindrical lattice structure 7 and a cylindrical fixing section 8 sleeved outside the cylindrical lattice structure 7, the width of the fixing section is more than or equal to 6mm, the width of the fixing section is 10mm, the height of the cylindrical fixing section 8 is the same as or different from the height of the central cylindrical lattice structure 7, and the height of the fixing section is 2 mm.
Performance test: the aperture of the manufactured product lattice structure is 5 mu m, the specific size is that the diameter of the cylindrical lattice structure 7 is 50mm, the column height is 0.5mm, the width of the cylindrical fixing section 8 sleeved on the outer side of the cylindrical lattice structure 7 is 10mm, and the height is 2mm, so that the functional requirement of a target product is met.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The space inclined lattice structure is characterized by comprising at least one space inclined structural unit, wherein the space inclined structural unit comprises an upper rectangular frame, a lower rectangular frame, spherical nodes and connecting rods;
the upper rectangular frame and the lower rectangular frame are rectangular with side length of a multiplied by b mm; the end parts of the adjacent sides of the rectangle are connected through spherical nodes;
The spherical nodes corresponding to the upper rectangular frame and the lower rectangular frame are connected through inclined connecting rods;
The projections of the upper rectangular frame and the lower rectangular frame are not overlapped.
2. The lattice structure of claim 1, wherein the connecting rods between the spherical nodes corresponding to the upper rectangular frame and the lower rectangular frame are not perpendicular to the rectangular planes of the upper rectangular frame and the lower rectangular frame.
3. The lattice structure of claim 1, wherein the connecting rods between the corresponding spherical nodes of the upper rectangular frame and the lower rectangular frame are identical in length and/or diameter.
4. The lattice structure of claim 1, wherein the upper rectangular frame and the lower rectangular frame are disposed in parallel.
5. The lattice structure of claim 1, wherein the connecting rods have a diameter of 0.1-5 mm.
6. The lattice structure of claim 1, wherein the tie bars are inclined at 0 ℃ < θ < 90 ℃.
7. The lattice structure of claim 1, wherein the straight line distance between the connecting rods between the four sides of the upper layer and the four sides of the lower layer is not less than 0.2mm.
8. The lattice structure according to claim 1, wherein the lattice structure is constituted by a structure in which a plurality of repeating units of spatially inclined structural units are arranged in lateral order, or a structure in which a plurality of repeating units of spatially inclined lattice structural units are arranged in lateral order, being vertically stacked.
9. A screen, characterized in that based on the spatially inclined lattice structure according to any one of claims 1-8, the pore size of the lattice structure is reduced by plastic deformation after manufacturing the spatially inclined lattice structure by additive manufacturing technique, resulting in a micro pore size screen.
10. A method of making a screen as claimed in claim 9, comprising the steps of:
s1: according to the actual application requirement, designing a three-dimensional model of the lattice structure according to any one of claims 1-8 by utilizing computer-aided design (CAD) software;
s2: manufacturing a lattice structure by an additive manufacturing technology;
S3: and (3) plastically deforming the lattice structure manufactured in the step (S2) to enable the lattice structure to be integrally or locally plastically deformed, and reducing the aperture of the lattice structure.
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