Topologically optimized skeleton structure
Through topological optimization design and selective laser melting technology, the balance between weight and load-bearing capacity of aerospace products is solved, and an efficient and lightweight design is achieved, and the ratio of load-bearing capacity to weight is improved.
Patent Information
- Application Number
- CN202420009443.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-02
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-01-02
AI Technical Summary
In aerospace products, the skeleton structure needs to find a balance between weight and load-bearing capacity, and the prior art is difficult to effectively achieve high load-bearing capacity and low weight design.
Using topologically optimized design, the skeleton structure is produced by selective laser melting technology, the main beam and the secondary beam are set into a tubular structure, and multiple cavity and weight reduction cavity are formed inside. Combined with reinforcement and weight reduction grooves, the material layout is optimized to improve the structure. Strength and weight reduction.
It achieves the goal of lightweight design by maximizing and reducing material usage, increasing the ratio of load-bearing capacity to weight while ensuring structural strength.
Smart Images
Figure CN222133456U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of metal additive manufacturing, in particular to a topologically optimized skeleton structure. Background Art
[0002] The skeleton structure is usually an important part of the entire product system, responsible for bearing or transmitting various loads. The skeleton structure in aerospace products also has strict restrictions on its weight. Therefore, it is very necessary to design the skeleton structure to be lightweight and seek a higher ratio of load-bearing capacity to weight. Utility Model Content
[0003] Based on this, it is necessary to provide a topologically optimized skeleton structure with a high ratio of load-bearing capacity to weight.
[0004] A topologically optimized skeleton structure is an integrally formed structure manufactured by selective laser melting technology, the topologically optimized skeleton structure comprising a main beam, a first sub-beam and a second sub-beam; the first sub-beam and the second sub-beam are respectively arranged at opposite ends of the main beam and are located on the same side of the main beam; the first sub-beam and the second sub-beam are both tubular structures; the side of the main beam on which the first sub-beam and the second sub-beam are arranged has a load-bearing surface, and the side away from the first sub-beam and the second sub-beam has an installation fixing point; the load-bearing surface is located between the first sub-beam and the second sub-beam; the main beam is a topological structure, and its interior undergoes force topological optimization to form a plurality of independent cavities.
[0005] In some embodiments, the multiple cavities include a first cavity, a second cavity, a third cavity and a fourth cavity arranged at intervals along the direction from the first sub-beam to the second sub-beam; a first powder overflow hole connected to the second cavity is formed at the bottom of the inner wall of the first cavity; a second powder overflow hole connected to the outside is formed at the bottom of the inner wall of the second cavity; a third powder overflow hole connected to the fourth cavity is formed at the bottom of the inner wall of the third cavity; a fourth powder overflow hole connected to the outside is formed at the bottom of the inner wall of the fourth cavity.
[0006] In some embodiments, the apertures of the first powder overflow hole, the second powder overflow hole, the third powder overflow hole, and the fourth powder overflow hole are all 3 mm to 8 mm.
[0007] In some embodiments, a first reinforcement portion is provided on a side of the first sub-beam facing away from the main beam; a first weight-reducing cavity is formed inside the first reinforcement portion; a second reinforcement portion is provided on a side of the second sub-beam facing away from the main beam; a second weight-reducing cavity is formed inside the second reinforcement portion.
[0008] In some embodiments, a fifth powder overflow hole communicating with the internal space of the first sub-beam is formed on the inner wall of the first weight reduction cavity; a sixth powder overflow hole communicating with the internal space of the second sub-beam is formed on the inner wall of the second weight reduction cavity.
[0009] In some embodiments, the diameters of the fifth powder overflow hole and the sixth powder overflow hole are 3 mm to 8 mm.
[0010] In some embodiments, a plurality of first weight-reducing grooves are formed on an inner wall of the first sub-beam; a plurality of second weight-reducing grooves are formed on an inner wall of the second sub-beam.
[0011] In some embodiments, half of the wall thickness of the first sub-beam is greater than the depth of the first weight-reducing groove; and half of the wall thickness of the second sub-beam is greater than the depth of the second weight-reducing groove.
[0012] In some embodiments, the main beam is a plate-like topological structure with a thickness of 30 mm; the wall thickness of the first sub-beam and the second sub-beam is 3 mm.
[0013] The topology optimized skeleton structure is manufactured by selective laser melting technology during processing. Even if the topology optimized skeleton structure has a complex structure and many curved surface features, it can be quickly processed and formed with low processing difficulty, and a high structural density and a high yield rate are guaranteed, which ensures that the obtained topology optimized skeleton structure has a high bearing strength. The first sub-beam and the second sub-beam are both set as hollow tubular structures, and a cavity is formed at a position with less force inside the main beam through topology optimization design, so as to reduce the weight of the structure as much as possible while ensuring that the overall strength of the topology optimized skeleton structure meets the use requirements, and achieve the effect of efficient bearing with a small amount of material, so as to achieve the purpose of lightweight. Therefore, the ratio of the bearing capacity to weight of the topology optimized skeleton structure is as high as possible. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:
[0015] Figure 1 This is a schematic diagram of the structure of the topologically optimized skeleton structure in a preferred embodiment of the utility model;
[0016] Figure 2 for Figure 1 Cross-sectional view of the topology-optimized skeleton structure shown.
[0017] Description of the reference numerals in the specific implementation manner: 100, topologically optimized skeleton structure; 110, main beam; 111, bearing surface; 112, installation fixing point; 113, cavity; 1131, first cavity; 1132, second cavity; 1133, third cavity; 1134, fourth cavity; 114, first powder overflow hole; 115, second powder overflow hole;
[0018] 116, third powder overflow hole; 117, fourth powder overflow hole; 120, first sub-beam; 121, first weight reduction groove;
[0019] 130, second sub-beam; 131, second weight-reducing groove; 140, first reinforcement portion; 141, first weight-reducing cavity;
[0020] 142. The fifth powder overflow hole; 150. The second reinforcement portion; 151. The second weight reduction cavity; 152. The sixth powder overflow hole. DETAILED DESCRIPTION
[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.
[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.
[0023] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intermediate element. It is also understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can be one or more intermediate elements.
[0024] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.
[0025] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.
[0026] See also Figure 1 The topology optimized skeleton structure 100 in the preferred embodiment of the present invention is an integrally formed structure made by selective laser melting technology. The topology optimized skeleton structure 100 includes a main beam 110 , a first sub-beam 120 and a second sub-beam 130 .
[0027] Please also read Figure 2 , the first sub-beam 120 and the second sub-beam 130 are respectively arranged at opposite ends of the main beam 110 and are located on the same side of the main beam 110. The first sub-beam 120 and the second sub-beam 130 are both tubular structures. The side of the main beam 110 on which the first sub-beam 120 and the second sub-beam 130 are arranged has a load-bearing surface 111, and the side away from the first sub-beam 120 and the second sub-beam 130 has an installation fixing point 112. The load-bearing surface 111 is located between the first sub-beam 120 and the second sub-beam 130. The main beam 110 is a topological structure, and its interior is subjected to force topological optimization to form a plurality of mutually independent cavities 113. Specifically, the main beam 110 is a plate-like topological structure with a thickness of 30 mm; the wall thickness of the first sub-beam 120 and the second sub-beam 130 is 3 mm.
[0028] Among them, the load-bearing surface 111 is the main load-bearing surface of the topology optimized skeleton structure 100, and the installation fixing point 112 is used for the connection and fixation between the topology optimized skeleton structure 100 and other components, so the direction of load transfer is from the load-bearing surface 111 to the installation fixing point 112.
[0029] Selective laser melting (SLM) is an additive manufacturing technology based on the layer-by-layer melting and stacking of a metal powder bed. It has high forming density and can form relatively complex structures. Even if the structure of the above-mentioned topologically optimized skeleton structure 100 is complex and has many curved surface features, it can be simply and quickly processed and formed using selective laser melting technology, making the processing difficulty of the topological skeleton structure lower and ensuring that the obtained topologically optimized skeleton structure 100 has a high bearing strength.
[0030] The first sub-beam 120 and the first main beam 110 are both set as hollow tubular structures, and the internal force topology of the main beam 110 is optimized to find the force transmission path. The area inside the main beam 110 with small load or material bearing requirements is designed to reduce weight to form a cavity 113, and the area with large load is reserved. The structural weight is reduced while ensuring that the above-mentioned topologically optimized skeleton structure 100 meets the mechanical performance requirements.
[0031] Therefore, the above-mentioned topologically optimized skeleton structure 100 can minimize the use of materials, improve material utilization, and reduce the overall weight of the structure while ensuring structural strength and product appearance, thereby achieving the purpose of improving the ratio of load-bearing capacity to weight.
[0032] In some embodiments, the plurality of cavities 113 include a first cavity 1131, a second cavity 1132, a third cavity 1133, and a fourth cavity 1134 arranged at intervals along the direction from the first sub-beam 120 to the second sub-beam 130. A first powder overflow hole 114 communicating with the second cavity 1132 is formed at the bottom of the inner wall of the first cavity 1131. A second powder overflow hole 115 communicating with the outside is formed at the bottom of the inner wall of the second cavity 1132. A third powder overflow hole 116 communicating with the fourth cavity 1134 is formed at the bottom of the inner wall of the third cavity 1133. A fourth powder overflow hole 117 communicating with the outside is formed at the bottom of the inner wall of the fourth cavity 1134.
[0033] The number of cavities 113 is set to four, and they are defined as a first cavity 1131, a second cavity 1132, a third cavity 1133 and a fourth cavity 1134 respectively, and are arranged at intervals along the direction from the first sub-beam 120 to the second sub-beam 130, so that each cavity 113 can obtain a larger space, and at the same time simplify the force transmission path of the load, which not only reduces the processing difficulty, but also can further improve the ratio of the load-bearing capacity to weight of the topologically optimized skeleton structure 100.
[0034] The powder in the first cavity 1131 can flow into the second cavity 1132 through the first powder overflow hole 114, and the powder in the second cavity 1132 can flow out through the second powder overflow hole 115. The powder in the third cavity 1133 can flow into the fourth cavity 1134 through the third powder overflow hole 116, and the powder in the fourth cavity 1134 can flow out through the fourth powder overflow hole 117. While reducing the surface holes, the powder in all cavities 113 can also be effectively discharged.
[0035] Furthermore, in some embodiments, the diameters of the first powder overflow hole 114, the second powder overflow hole 115, the third powder overflow hole 116, and the fourth powder overflow hole 117 are all 3 mm to 8 mm. Thus, the diameters of the powder overflow holes are all 3 mm to 8 mm, which can ensure that the powder in each cavity 113 can be cleaned smoothly.
[0036] In some embodiments, a first reinforcement portion 140 is provided on a side of the first sub-beam 120 away from the main beam 110. A first weight reduction cavity 141 is formed inside the first reinforcement portion 140. A second reinforcement portion 150 is provided on a side of the second sub-beam 130 away from the main beam 110. A second weight reduction cavity 151 is formed inside the second reinforcement portion 150. While ensuring the bearing strength of the first sub-beam 120 and the second sub-beam 130, reducing the weight of the first sub-beam 120 and the second sub-beam 130 is beneficial to further lightweighting of the topologically optimized skeleton structure 100.
[0037] In some embodiments, the inner wall of the first weight reduction cavity 141 is formed with a fifth powder overflow hole 142 that is connected to the internal space of the first sub-beam 120. The inner wall of the second weight reduction cavity 151 is formed with a sixth powder overflow hole 152 that is connected to the internal space of the second sub-beam 130. Because the first weight reduction cavity 141 and the second weight reduction cavity 151 are both closed chambers, after molding, the powder in the first weight reduction cavity 141 can be discharged into the first sub-beam 120 through the fifth powder overflow hole 142, and then removed from the first sub-beam 120, and the powder in the second weight reduction cavity 151 can be discharged into the second sub-beam 130 through the sixth powder overflow hole 152, and then removed from the second sub-beam 130.
[0038] Furthermore, in some embodiments, the diameters of the fifth powder overflow hole 142 and the sixth powder overflow hole 152 are 3 mm to 8 mm, so that the powder in the first weight reduction cavity 141 and the second weight reduction cavity 151 can be cleaned up smoothly.
[0039] In some embodiments, a plurality of first weight-reducing grooves 121 are formed on the inner wall of the first sub-beam 120. A plurality of second weight-reducing grooves 131 are formed on the inner wall of the second sub-beam 130. Specifically, the first weight-reducing grooves 121 are long strip grooves arranged along the axial direction of the first sub-beam 120, and the second weight-reducing grooves 131 are long strip grooves arranged along the axial direction of the second sub-beam 130.
[0040] The provision of the first weight-reducing groove 121 and the second weight-reducing groove 131 can realize a weight-reducing design for the first sub-beam 120 and the second sub-beam 130 , while ensuring the bearing strength of the first sub-beam 120 and the second sub-beam 130 , effectively reducing the weight of the first sub-beam 120 and the second sub-beam 130 , which is beneficial to further lightweighting of the topologically optimized skeleton structure 100 .
[0041] Furthermore, in some embodiments, half of the wall thickness of the first sub-beam 120 is greater than the depth of the first weight-reducing groove 121. Half of the wall thickness of the second sub-beam 130 is greater than the depth of the second weight-reducing groove 131. In this way, while achieving weight reduction, the support strength of the first sub-beam 120 and the second sub-beam 130 can meet the use requirements.
[0042] In order to make the ratio of the load-bearing capacity to the weight of the first sub-beam 120 and the second sub-beam 130 higher, the depth of the first weight-reducing groove 121 can be set to a value close to half the wall thickness of the first sub-beam 120, and the depth of the second weight-reducing groove 131 can be set to a value close to half the wall thickness of the second sub-beam 130. Specifically, when the wall thickness of the first sub-beam 120 and the second sub-beam 130 is 3 mm, the depth of the first weight-reducing groove 121 and the second weight-reducing groove 131 is 1.25 mm.
[0043] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0044] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A topologically optimized skeleton structure, characterized in that: It is an integrally formed structure manufactured by selective laser melting technology, and the topologically optimized skeleton structure includes a main beam, a first sub-beam and a second sub-beam; the first sub-beam and the second sub-beam are respectively arranged at opposite ends of the main beam and are located on the same side of the main beam; the first sub-beam and the second sub-beam are both tubular structures; the side of the main beam on which the first sub-beam and the second sub-beam are arranged has a load-bearing surface, and the side away from the first sub-beam and the second sub-beam has an installation fixing point; the load-bearing surface is located between the first sub-beam and the second sub-beam; the main beam is a topological structure, and its interior undergoes force topological optimization to form a plurality of independent cavities.
2. The topology optimized skeleton structure according to claim 1, characterized in that: The multiple cavities include a first cavity, a second cavity, a third cavity and a fourth cavity arranged at intervals along the direction from the first sub-beam to the second sub-beam; a first powder overflow hole connected to the second cavity is formed at the bottom of the inner wall of the first cavity; a second powder overflow hole connected to the outside is formed at the bottom of the inner wall of the second cavity; a third powder overflow hole connected to the fourth cavity is formed at the bottom of the inner wall of the third cavity; a fourth powder overflow hole connected to the outside is formed at the bottom of the inner wall of the fourth cavity.
3. The topology optimized skeleton structure according to claim 2, characterized in that: The apertures of the first powder overflow hole, the second powder overflow hole, the third powder overflow hole and the fourth powder overflow hole are all 3 mm to 8 mm.
4. The topology optimized skeleton structure according to claim 1, characterized in that: A first reinforcement portion is provided on the side of the first sub-beam away from the main beam; a first weight-reducing cavity is formed inside the first reinforcement portion; a second reinforcement portion is provided on the side of the second sub-beam away from the main beam; a second weight-reducing cavity is formed inside the second reinforcement portion.
5. The topology optimized skeleton structure according to claim 4, characterized in that: A fifth powder overflow hole communicating with the inner space of the first sub-beam is formed on the inner wall of the first weight reduction cavity; a sixth powder overflow hole communicating with the inner space of the second sub-beam is formed on the inner wall of the second weight reduction cavity.
6. The topology optimized skeleton structure according to claim 5, characterized in that: The apertures of the fifth powder overflow hole and the sixth powder overflow hole are 3 mm to 8 mm.
7. The topology optimized skeleton structure according to claim 1, characterized in that: A plurality of first weight-reducing grooves are formed on an inner wall of the first sub-beam; a plurality of second weight-reducing grooves are formed on an inner wall of the second sub-beam.
8. The topology optimized skeleton structure according to claim 7, characterized in that: Half of the wall thickness of the first sub-beam is greater than the depth of the first weight-reducing groove; half of the wall thickness of the second sub-beam is greater than the depth of the second weight-reducing groove.
9. The topology optimized skeleton structure according to claim 1, characterized in that: The main beam is a plate-like topological structure with a thickness of 30 mm; the wall thickness of the first sub-beam and the second sub-beam is 3 mm.