Multi-interface bearing cylinder with integrated layering structure

Abstract

The invention provides a multi-interface bearing cylinder with an integrated layering structure, which is divided according to areas and comprises a bearing cylinder main body, an upper flange, a lower flange and a lateral flange, and all areas of the multi-interface bearing cylinder are integrally paved by adopting a carbon fiber composite material layer. The multi-interface bearing cylinder with the integrated paving layer structure has the characteristics of light weight, simplified configuration, simple process and the like, simplifies the preparation process of a multi-storage-box embedded propulsion module of a spacecraft and an adapter structure for multi-star launching, reduces the weight of the multi-storage-box embedded propulsion module of the spacecraft and the adapter structure for multi-star launching, and improves the reliability of the multi-interface bearing cylinder. And the adaptability of the spacecraft to a multi-load launching task is improved.

Description

Technical Field

[0001] The present invention relates to the field of aerospace, in particular to an adapter structure suitable for a multi-tank embedded propulsion cabin of a spacecraft and multi-satellite launch, and specifically to a multi-interface load-bearing cylinder with an integrated laminate structure. Background Art

[0002] Multi-interface load-bearing cylinder structures are common in the aerospace field. Their structural forms are mostly used in products such as multi-tank embedded propulsion cabins and multi-satellite serial-parallel launch adapters. They have the characteristics of high load-bearing efficiency and strong interface designability. The main body of the traditional multi-interface load-bearing cylinder mostly adopts a frame girder structure and a honeycomb sandwich structure, supplemented by gluing, riveting and other forms of assembly of interface flanges on the side walls. Their structural forms and preparation processes are relatively complex. With the development of one-piece molding technology of carbon fiber composite materials, the engineering application of one-piece layered complex configuration structural products has become a reality. The one-piece layered structure is lightweight and simple, which perfectly meets the high-performance, low-cost and rapid response requirements of intensive aerospace launch missions. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-interface load-bearing cylinder with an integrated laminate structure to simplify the preparation process of a multi-tank embedded propulsion cabin and an adapter structure for multi-star launches of a spacecraft, and to reduce the weight of the multi-tank embedded propulsion cabin and an adapter structure for multi-star launches of a spacecraft.

[0004] The technical solution of the present invention is as follows:

[0005] A multi-interface load-bearing cylinder with an integrated ply structure, characterized in that the load-bearing cylinder is of a multi-interface configuration and is divided into regions, including a load-bearing cylinder body, an upper flange, a lower flange, and a lateral flange; all regions of the load-bearing cylinder are integrally paved with carbon fiber composite material plies.

[0006] in:

[0007] The ply designs of the bearing cylinder body, upper flange, lower flange and lateral flange regions are differentiated according to the requirements of mechanical properties. Specifically, the bearing cylinder body region adopts the bearing cylinder body ply, the upper flange region adopts the upper flange ply, the lower flange region adopts the lower flange ply, and the lateral flange region adopts the lateral flange ply.

[0008] Furthermore, in the optimization design of the bearing tube main body ply, upper flange ply, lower flange ply and lateral flange ply, a method of preliminary agreed ply ratio is adopted to simplify the complex ply thickness and angle parameter optimization into a single ply thickness optimization.

[0009] Furthermore, at the intersection of the bearing cylinder main body ply, upper flange ply, lower flange ply and lateral flange ply, a ply transition zone is designed, specifically: main body-upper flange transition zone, main body-lower flange transition zone, main body-lateral flange transition zone, upper flange-lateral flange transition zone, lower flange-lateral flange transition zone; all the transition zones adopt a method combining intercalation and reduced layer laying to achieve structural continuity and uniform surface thickness in each area.

[0010] The multi-interface load-bearing cylinder with an integrated ply structure adopts a multi-prism-shaped female mold for its molding die; the molding surface of the multi-prism-shaped female mold includes an inner cylindrical molding surface, an upper molding plane, a lower molding plane, a lateral cylindrical molding surface and a lateral molding plane; the cylindrical molding surface is used for the ply molding of the load-bearing cylinder body; the upper molding plane is used for the ply molding of the upper flange; the lower molding plane is used for the ply molding of the lower flange; the lateral cylindrical molding surface and the lateral molding plane are used for the ply molding of the lateral flange.

[0011] Furthermore, the polygonal female mold is designed to be initially split along the inner cylindrical molding surface and the lateral cylindrical molding surface, and the initial split mold is further split for a second time, including repeatedly disassembled molding blocks and wedge blocks.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) In the present invention, the multi-interface bearing cylinder adopts an integrated layer structure, which simplifies the traditional series of complex processes into layer forming and curing processes, thereby greatly simplifying the structural form and process flow, effectively reducing production costs and shortening the matching cycle;

[0014] (2) In the present invention, the application of carbon fiber composite materials can significantly reduce the structural weight of the multi-interface bearing cylinder and improve the mission efficiency and benefits of the spacecraft;

[0015] (3) In the present invention, the multi-prism-shaped split-petal female mold is simple and efficient, which is conducive to ensuring the accuracy of the molding surface, and can achieve rapid and repeated disassembly and assembly, and has the characteristics of rapid response. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram (front view) of a multi-interface bearing cylinder with an integrated ply structure according to an embodiment of the present invention;

[0017] Figure 2 It is a schematic diagram of a multi-interface bearing cylinder of an integrated ply structure according to an embodiment of the present invention (reference view);

[0018] Figure 3 is a schematic diagram of layer laying in each area of ​​an embodiment of the present invention;

[0019] Figure 4Schematic diagram of the forming surface of a polygonal columnar female mold according to an embodiment of the present invention;

[0020] Figure 5 Schematic diagram of the composition of a polygonal columnar female mold according to an embodiment of the present invention (the product is not shown);

[0021] Figure 6 Schematic diagram of the composition of a polygonal columnar female mold according to an embodiment of the present invention (product shown);

[0022] In the figure, 1 is the main body of the bearing cylinder; 2 is the upper flange; 3 is the lower flange; 4 is the lateral flange; 5 is the main body ply of the bearing cylinder; 6 is the upper flange ply; 7 is the lower flange ply; 8 is the lateral flange ply; 9 is the main body-upper flange transition zone; 10 is the main body-lower flange transition zone; 11 is the main body-lateral flange transition zone; 12 is the upper flange-lateral flange transition zone; 13 is the lower flange-lateral flange transition zone; 14 is the inner cylindrical forming surface; 15 is the upper forming plane; 16 is the lower forming plane; 17 is the lateral cylindrical forming surface; 18 is the lateral forming plane; 19 is the forming block; and 20 is the wedge block. DETAILED DESCRIPTION

[0023] The following will be combined Figures 1 to 6 A multi-interface load-bearing cylinder with an integrated ply structure provided by the present invention is described in detail, which is an optional embodiment of the present invention. It can be considered that those skilled in the art can modify and embellish it without changing the spirit and content of the present invention.

[0024] Figure 1 FIG. 1 is a schematic diagram (front view) of a multi-interface bearing cylinder of an integrated ply structure according to an embodiment of the present invention. Figure 1 It can be seen that the diameter of the bearing cylinder body (1) is Φ1750mm and the height is 1325mm; the flange opening diameter of the lateral flange (4) is Φ1070mm, the distance between the opening center and the lower end face is 680mm, and the distance between the symmetrical flange faces is 1876mm;

[0025] Figure 2 The present invention is a schematic diagram of a multi-interface bearing cylinder of an integrated ply structure (reference view) according to an embodiment of the present invention. The bearing cylinder is a six-interface bearing cylinder, which includes a bearing cylinder body (1), an upper flange (2), a lower flange (3), and four lateral flanges (4) according to the area. Among them, the upper flange (2) adopts an outward-turned structure, and the lower flange (3) has no flange.

[0026] The upper end of the support cylinder is connected to the satellite docking ring through an upper flange (2); the lower end of the support cylinder is connected to the launch vehicle docking ring through a lower flange (3). The lateral flange (4) at the support cylinder is used to connect to the tank.

[0027] Furthermore, the mechanical property requirement of the bearing cylinder is that the axial stiffness is greater than or equal to 1.8×108 N / m, bending stiffness greater than or equal to 7.5×10 7 Nm / rad.

[0028] Furthermore, the ply layers of the bearing cylinder body (1), the upper flange (2), the lower flange (3), and the lateral flange (4) are designed differently according to the requirements of mechanical properties. Specifically, the bearing cylinder body (1) area adopts the bearing cylinder body ply layer (5), the upper flange (2) area adopts the upper flange ply layer (6), the lower flange (3) area adopts the lower flange ply layer (7), and the lateral flange (4) area adopts the lateral flange ply layer (8).

[0029] Furthermore, in the optimization design of the bearing tube main body ply (5), the upper flange ply (6), the lower flange ply (7), and the lateral flange ply (8), a method of preliminarily agreeing on the ply ratio is adopted to simplify the complex multi-parameter optimization such as ply thickness and angle into a single ply thickness optimization.

[0030] See also Figure 3 , is a schematic diagram of the ply laying of each region in an embodiment of the present invention.

[0031] The carbon fiber composite material used in the embodiment of the present invention is a T800 grade carbon fiber reinforced composite material prepreg, and the unidirectional tape mechanical properties thereof are shown in the following table.

[0032]

[0033] The specific steps are:

[0034] S1: The main body of the bearing cylinder (1) is mainly subjected to loads from satellites and tanks. The load form is mainly axial load, which places high demands on the axial stiffness and strength of the main body of the bearing cylinder (1). Therefore, the proportion of 0° (axial) plies of the main body of the bearing cylinder (5) should be increased to more than 50%.

[0035] S2: The upper flange (2) is mainly subjected to the connection load between the upper flange and the satellite. The load form is mainly point-type concentrated load, which places high demands on the bending stiffness and strength of the flange of the upper flange (2). Therefore, the upper flange ply (6) should increase the 0° (radial) ply ratio to more than 50% and be thickened.

[0036] S3: The lower flange (3) is mainly subjected to the connection load with the launch vehicle. The load form is mainly axial load, which places high demands on the axial stiffness and strength of the lower flange (3). Therefore, the 0° (axial) ply ratio of the lower flange ply (7) should be increased to more than 50%, and the ply thickness should be increased.

[0037] S4: The lateral flanges (4) at 4 locations mainly bear the load from the tank, and through their own stiffness design, they reasonably share the axial load from the satellite, and control the load level of the tank within a safe level. In view of the complex force form of the lateral flanges (4) and the configuration characteristics of the spherical tank, the lateral flange ply (8) should tend to be quasi-isotropic.

[0038] S5: Based on the laying principles described in steps S1 to S4, preliminary agreements are made on the laying proportions and laying forms of the bearing cylinder main body laying (5), upper flange laying (6), lower flange laying (7), and lateral flange laying (8) at various angles, as shown in the following table. The multi-parameter optimization of the thickness, angle, etc. of the laying is then simplified to a single optimization of the laying thickness.

[0039]

[0040] S6: Taking the axial stiffness and bending stiffness requirements of the bearing cylinder as constraints and the minimum weight as the goal, the four thickness parameters of the bearing cylinder main layer (5), upper flange layer (6), lower flange layer (7), and lateral flange layer (8) are optimized. It is assumed that the thickness parameters of the upper flange layer (6) and the lower flange layer (7) are the same to facilitate the implementation and curing of the structural layer. After the optimal thickness of the layer in each area is obtained through parameter optimization, the layer is further specifically regularized with reference to the layer agreement plan in step S5, and the specific layer plan of the bearing cylinder main layer (5), upper flange layer (6), lower flange layer (7), and lateral flange layer (8) is shown in the following table.

[0041]

[0042] See also Figure 3 , is a schematic diagram of the ply laying of each region in an embodiment of the present invention.

[0043] A ply transition zone is designed at the intersection of the main ply (5), the upper flange ply (6), the lower flange ply (7) and the lateral flange ply (8) of the bearing tube, including a main body-upper flange transition zone (9), a main body-lower flange transition zone (10), a main body-lateral flange transition zone (11), an upper flange-lateral flange transition zone (12) and a lower flange-lateral flange transition zone (13). The above transition zones adopt a method combining intercalation and reduced ply laying to achieve structural continuity and uniform profile thickness in each area.

[0044] The specific steps of the transition zone are:

[0045] S1: In the main body-upper flange transition zone (9) and the main body-lower flange transition zone (10), the main body ply (5) of the bearing cylinder is kept continuous, and the upper flange ply (6) and the lower flange ply (7) are realized by inserting and thickening.

[0046] S2: In the main body-lateral flange transition zone (11), the main body ply (5) of the bearing tube is kept continuous, and 42 layers of the lateral flange ply (8) are inserted into the main body ply (5) of the bearing tube. Six layers of the lateral flange ply (8) are designed to be reduced in the main body-lateral flange transition zone (11), thereby ensuring that the maximum thickness of the main body-lateral flange transition zone (11) is 8.4 mm, which is consistent with the thickness of the upper flange ply (6) and the lower flange ply (7), thereby achieving structural continuity and uniform surface thickness in the corresponding area.

[0047] S3: In the upper flange-lateral flange transition area (12) and the lower flange-lateral flange transition area (13), specific design is performed with reference to the method of combining intercalation and reduced layer laying described in step S2 to ensure structural continuity and uniform profile thickness in the corresponding areas.

[0048] S4: According to the specific laying scheme of the main body of the bearing cylinder (5), the upper flange laying (6), the lower flange laying (7), the lateral flange laying (8), the main body-upper flange transition zone (9), the main body-lower flange transition zone (10), the main body-lateral flange transition zone (11), the upper flange-lateral flange transition zone (12), and the lower flange-lateral flange transition zone (13), a finite element model is established, and static simulation analysis is carried out to obtain the axial and bending moment stiffness of the bearing cylinder structure and determine the compliance of the stiffness index. As shown in the following table.

[0049]

[0050] See also Figures 4 to 6 , respectively a schematic diagram of the polygonal prism type female mold forming surface of an embodiment of the present invention, a schematic diagram of the polygonal prism type female mold composition (the product is not shown), and a schematic diagram of the polygonal prism type female mold composition (the product is shown).

[0051] The bearing cylinder forming mold of the embodiment of the present invention adopts a quadrangular prism-shaped female mold, and the quadrangular prism-shaped female mold forming surface includes an inner cylindrical forming surface (14), an upper forming plane (15), a lower forming plane (16), four lateral cylindrical forming surfaces (17) and four lateral forming planes (18), which are respectively used for the layering forming of the bearing cylinder body (1), the upper flange (2), the lower flange (3) and the four lateral flanges (4).

[0052] Furthermore, the polygonal female mold is designed to be initially split along the inner cylindrical molding surface (14) and the lateral cylindrical molding surface, and the initial split mold is further split for a second time, specifically including 8 molding blocks (19) and 4 wedge blocks (20).

[0053] In the process of forming the polygonal female mold, the specific steps are:

[0054] S1: 8 molding blocks (19) and 4 wedge blocks (20) are first assembled and adjusted to ensure the accuracy of each molding surface;

[0055] S2: According to the laying design plan, the bearing cylinder body (1), upper flange (2), lower flange (3), four side flanges (4), and the body-upper flange transition zone (9), body-lower flange transition zone (10), body-side flange transition zone (11), upper flange-side flange transition zone (12), and lower flange-side flange transition zone (13) are laid out;

[0056] S3: The laminate structure is solidified and formed by hot vacuum bag hot pressing method, which can be supplemented by local molding method;

[0057] S4: After solidification and molding, the four wedge blocks (20) are preferentially removed radially to release the lateral constraints of the eight molding blocks (19), and then the eight molding blocks (19) are removed by side pulling to achieve complete demoulding of the product.

[0058] The embodiments of the present invention described above are only used to help explain the present invention. These embodiments are selected and specifically described in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification, which all belong to the protection scope of the present invention.

Claims

1. A multi-interface bearing cylinder with an integrated ply structure, characterized in that: The multi-interface bearing cylinder is divided into regions, comprising a bearing cylinder body (1), an upper flange (2), a lower flange (3), and a lateral flange (4); all regions of the multi-interface bearing cylinder are integrally paved with carbon fiber composite material layers.

2. The multi-interface bearing cylinder with integrated ply structure according to claim 1, characterized in that: The ply laying process of each region of the bearing cylinder body (1), the upper flange (2), the lower flange (3) and the lateral flange (4) is designed differently according to the requirements of mechanical properties. Specifically, the bearing cylinder body region (1) adopts the bearing cylinder body ply laying (5), the upper flange (2) region adopts the upper flange ply laying (6), the lower flange (3) region adopts the lower flange ply laying (7), and the lateral flange (4) region adopts the lateral flange ply laying (8).

3. The multi-interface bearing cylinder with integrated ply structure according to claim 2 is characterized in that: The bearing cylinder main body ply (5), upper flange ply (6), lower flange ply (7) and lateral flange ply (8) are designed with ply thickness parameters by adopting a method of preliminarily agreeing on ply ratios.

4. The multi-interface bearing cylinder with integrated ply structure according to claim 2, characterized in that: A ply transition zone is designed at the intersection of the main ply (5), the upper flange ply (6), the lower flange ply (7) and the lateral flange ply (8) of the bearing cylinder, specifically: a main body-upper flange transition zone (9), a main body-lower flange transition zone (10), a main body-lateral flange transition zone (11), an upper flange-lateral flange transition zone (12) and a lower flange-lateral flange transition zone (13); all the transition zones are laid by a method combining intercalation and layer reduction.

5. The multi-interface bearing cylinder with integrated ply structure according to claim 1, characterized in that: The integrally laminated structure multi-interface bearing cylinder has a molding die that adopts a polygonal prism-shaped female mold; the polygonal prism-shaped female mold molding surface includes an inner cylindrical molding surface (14), an upper molding plane (15), a lower molding plane (16), a lateral cylindrical molding surface (17) and a lateral molding plane (18).

6. The multi-interface bearing cylinder with integrated ply structure according to claim 5, characterized in that: The polygonal female mold is designed with an initial split mold along the inner cylindrical molding surface (14) and the lateral cylindrical molding surface (17).

7. The multi-interface bearing cylinder with integrated ply structure according to claim 6 is characterized in that: The initial splitting mold comprises a molding block (19) and a wedge block (20) which can be repeatedly disassembled and assembled, and can perform secondary splitting.

8. The multi-interface bearing cylinder with integrated ply structure according to claim 7, characterized in that: There are four wedge blocks (20) and eight forming blocks (19).

9. The multi-interface bearing cylinder with integrated ply structure according to claim 1, characterized in that: The mechanical property requirements of the load-bearing cylinder are that the axial stiffness is greater than or equal to 1.8×108N / m, and the bending stiffness is greater than or equal to 7.5×107N.m / rad.

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