Ultra-light bearing square column prefabricated body and preparation method thereof
By preparing ultra-lightweight square column prefabricated bodies, combining the design of hollow rib positions and column molds, and combining the suture technology of winding fiber cloth, the problem of ceramic matrix composite materials in spacecraft is difficult to take into account both lightweight and high strength. , realizes lightweight and high-strength prefabricated bodies, reduces satellite quality and improves stability.
Patent Information
- Application Number
- CN202411580067.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-01-03
AI Technical Summary
In the field of spacecraft, it is difficult to achieve lightweight and high strength during the preparation of existing ceramic matrix composite materials, especially in fixed applications of small brackets such as space infrared cameras, which require higher lightweight requirements to reduce satellite quality. and improve stability.
Using an ultra-lightweight square column prefabricated body and its preparation method, the hollow rib position and column mold are prepared, combined with the jointing method of winding fiber cloth, material savings and simple process, high production efficiency and low cost are achieved. Prefabricated body preparation. The specific steps include preparing hollow rib positions, installing column molds, adding components, wrapping fiber cloths and sewing them to form a load-bearing square column with adjustable length.
It realizes a prefabricated body that achieves lightweight effects on the basis of meeting the load-bearing capacity, reduces the quality of satellites, improves the stability of space cameras in space, and saves launch costs and manpower and material resources.
Smart Images
Figure CN119239006A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of aerospace equipment preparation, and in particular to an ultra-light load-bearing square column preform and a preparation method thereof. Background Art
[0002] With the rapid development of aerospace technology, lightweighting has become one of the main challenges facing spacecraft. In the field of space satellite applications, small brackets are often used to fix small equipment, such as space infrared cameras, etc., and these small brackets only need to have the bearing capacity they can bear, so higher lightweight requirements can be put forward for them. Ceramic-based composite materials have the characteristics of high temperature resistance, high strength, corrosion resistance, and zero shrinkage and expansion, and are often used in the preparation of aerospace parts. In the preparation process of ceramic-based composite materials, the structure of the fiber preform has a crucial influence on the strength of the structural parts. The more complete the fiber continuity of the preform, the higher the strength of the corresponding component; the less the amount of fiber used in the preform, the better the lightweight effect.
[0003] Using cavity components to fix the space infrared camera can not only effectively achieve the lightweight of the space camera, but also increase the stability of the space camera in space. When launching a satellite, it can effectively reduce the mass of the satellite, which will effectively save the manpower and material costs required for launching and improve the efficiency of satellite launch and work.
[0004] Therefore, the present invention proposes an ultra-light load-bearing square column prefabricated body and a preparation method thereof, which can achieve the lightweight effect as much as possible on the basis of meeting its bearing capacity. Summary of the invention
[0005] The object of the present invention is to provide a preform and a preparation method thereof which are material-saving, relatively simple in process, high in production efficiency, low in cost and lightweight.
[0006] In order to achieve the above technical effects, the present invention discloses an ultra-light load-bearing square column preform and a preparation method thereof. The preparation method of the preform comprises the following steps: S1. Prepare a number of hollow rib positions, where a is a positive integer. The method for preparing a single hollow rib position is to prepare m identical hollow rib position expansion diagrams, where m is a positive integer and an even number, and stack m layers of hollow rib position expansion diagrams. Perform two-dimensional stitching on the area between quadrilateral 1 and quadrilateral 2. Take m / 2 pieces of fiber cloth on both sides and fold them outward, with the folding line in the shape of quadrilateral 2, until the folding surface is perpendicular to the fiber cloth. Cut once along the folding line direction between adjacent folding surfaces, with the cutting position being the portion from the edge of the quadrilateral to the folding line. There are two cutting positions between adjacent folding surfaces, and any one of the cutting positions can be used for cutting. There is a surplus of fiber cloth after folding between adjacent folding surfaces, and the surplus of fiber cloth is stitched after being bonded to the fiber cloth of the adjacent folding surfaces. The hollow rib position is prepared from the fiber cloth. S2. Prepare a+1 cylindrical molds, which are installed on both sides of the rib position; the cross section of the cylindrical mold is the same size as the hollow rib position; one side of the cylindrical mold is a convex structure, and the end of the convex structure has a bite structure; the other end of the cylindrical mold is a groove structure, and the inner side of the groove has a bite structure; the head and tail of the cylindrical molds can bite each other, and the bite structure is connected through the hollow part of the hollow rib position; S3. Add hollow ribs and column molds on the horizontal plane in sequence to form components; the length of the load-bearing square column can be adjusted; S4, prepare n pieces of winding fiber cloth, where n is a positive integer, the winding fiber cloth covers one side of the component, and all the hollow ribs are sewed to the winding fiber cloth by grooving; turn the component over until all four sides are sewed to the hollow ribs, and further sew the remaining winding fiber cloth to the winding fiber cloth by grooving; wrap the components assembled in step S3 in sequence, cover them with n layers of winding fiber cloth, sew them by grooving, and sew them to the upper layer of fiber cloth.
[0007] Furthermore, the unfolded diagram of the cavity rib position is a quadrilateral.
[0008] Furthermore, quadrilateral 1 and quadrilateral 2 are defined within the quadrilateral; the quadrilateral, quadrilateral 1, and quadrilateral 2 are of equal proportions, have the same center point, and have four parallel sides; quadrilateral 1 has the smallest area and is cut off along the shape of quadrilateral 1 as a hollow quadrilateral; quadrilateral 2 serves as a folding line.
[0009] Preferably, the quadrilateral is a parallelogram or a rectangle.
[0010] Furthermore, the column mold material is a non-metallic material with a flammability point not higher than 800°C.
[0011] Furthermore, each layer of the wound fiber cloth starts at a different surface. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description: Figure 1 This is the combination diagram of the single cavity rib and the column mold; Figure 2 Structural diagram of hollow reinforcement position; Figure 3 This is the unfolded view of the hollow reinforcement position; Figure 4 This is the planed surface diagram of the combination of a single cavity rib and a column mold. DETAILED DESCRIPTION
[0013] The present invention is further described in detail below through examples so that those skilled in the art can implement the invention with reference to the description.
[0014] S1. Preparation of hollow ribs Cut 12 pieces of carbon fiber plain cloth with a size of 110mm*110mm. The plain cloth is tilted to form a parallelogram with an inclination angle of 85 degrees. Then the edge is locked. The edge is to fix the cut part of the fiber cloth. Draw two parallelograms of the same proportion and parallel to each other, which are defined as quadrilateral 1 and quadrilateral 2. After the square is tilted, the horizontal length does not change, so it is measured by the horizontal length. Figure 3 As shown in the dashed quadrilateral, quadrilateral 2 is drawn with a horizontal length of 93 mm; Figure 3 As shown in the smallest solid line quadrilateral, quadrilateral 1 is cut to form a parallelogram-shaped hole, and the hole is edge-locked. The horizontal length of quadrilateral 1 is 60 mm.
[0015] The supporting preform prepared this time is an inclined body, so a parallelogram-shaped hollow rib position is used as an embodiment. If the preform application scenario is horizontal or vertical, a square or rectangle is used as the hollow rib position.
[0016] 12 pieces of fiber cloth are stacked to a thickness of 4.5 mm, and the surfaces between quadrilateral 1 and quadrilateral 2 are sutured using a two-dimensional suture process with the suture density as high as possible to ensure the firmness of the connection. Figure 3 As shown, the solid line portion of the dotted line extension line of quadrilateral 2 is cut and the edges are locked.
[0017] Take an equal amount, fold the fiber cloth outside the suture area, and the folding angle is 90 degrees. The adjacent fiber cloths turned outward are independent of each other. After the four sides of the fiber cloth are folded, "four walls" are constructed, and there is fiber cloth surplus between the adjacent "walls". The fiber cloth surplus is used as the suture cloth to suture and connect the four "four walls". The two sides of the hollow rib position are treated in the same way to obtain the following Figure 2 The hollow rib position diagram is shown.
[0018] S2. Prepare a square cylinder mold.
[0019] The cross-sectional size of the cylindrical mold is the same as that of the hollow rib position. There is a protrusion on one side of the cylindrical mold and a groove on the other side. There is an interlocking structure at the end of the protrusion and in the groove. The size of the protrusion is the same as the hollow size of the hollow rib position. The planed surface of the mold interlocking scene is shown in Figure 4.
[0020] S3. Adding hollow ribs and column molds on one side in sequence can adjust the length of the load-bearing square column.
[0021] The length of the preform to be prepared this time needs to be 1000mm, and the length of a single column mold is 200mm. It requires 4 hollow rib positions and 5 column molds. The column mold-hollow rib position-column mold-hollow rib position-column mold-hollow rib position-column mold-hollow rib-column mold is connected in sequence. If the length of the preform needs to be 900mm, one of the column molds can also be replaced with a length of 100mm. Other length requirements can be achieved in the same way.
[0022] S4, preparing a winding fiber cloth and winding the cylindrical mold.
[0023] Step S3: A 1000mm component has been prepared. Four pieces of carbon fiber cloth with a length of 1050mm and a width of 380mm are cut. The length of the carbon fiber cloth is aligned with one side of the prepared component, and a 25mm carbon fiber cloth margin is left at both ends of the length, and it is ensured that the carbon fiber cloth has fully covered the component. The two sides of the prepared component are raised to the same height as the component to ensure that the carbon fiber cloth will not warp during the sewing process. Mark the position of the hollow ribs on the component, and sew the carbon fiber cloth with the hollow ribs by hooking, with a stitching density of 2mm×2mm. After the component is sewn on one side, it is turned over, and the carbon fiber cloth is also turned over at the same time. The position of the hollow ribs on the component is marked, and the carbon fiber cloth is sewed with the hollow ribs by hooking, with a stitching density of 2mm×2mm. The four sides of the component are sewn in this way. At this time, due to the large width of the cut fiber cloth, there will be a margin. The margin is stitched with the carbon fiber cloth that has been fixed on the first side by hooking. Wrap the second carbon fiber cloth in the same way. Start sewing the second carbon fiber cloth from the second side and sew it with the first carbon fiber cloth by hooking. All the surfaces need to be sewn with a sew density of 4mm×4mm. The sew density of the hollow ribs is kept at 2mm×2mm. Wrap two more carbon fiber cloths in the same way, trim the carbon fiber cloths with enough margins, and complete the preparation of the ultra-lightweight load-bearing square column prefabricated body.
[0024] The protection scope of the present invention is the preform and its preparation method. The preform will be subsequently subjected to steps such as interface deposition. After one deposition, the preform will be formed into a prototype, and the mold that plays a supporting role will melt and disappear due to high-temperature deposition. At this time, the prototype structure has also been stable, and a mold is needed to support and finalize it. For the convenience of understanding, this paragraph is specially added for explanation.
Claims
1. An ultra-light load-bearing square column prefabricated body and a preparation method thereof, characterized in that: The method for preparing the preform comprises the following steps: S1. Prepare a number of hollow rib positions, where a is a positive integer. The method for preparing a single hollow rib position is to prepare m identical hollow rib position expansion diagrams, where m is a positive integer and an even number, and stack m layers of hollow rib position expansion diagrams; perform two-dimensional stitching on the area between quadrilateral 1 and quadrilateral 2; take m / 2 pieces of fiber cloth on both sides and fold them outward, with the folding line being in the shape of quadrilateral 2, until the folding surface is perpendicular to the fiber cloth; Adjacent folding surfaces are cut once along the folding line direction, and the cutting position is from the edge of the quadrilateral to the folding line. There are two cutting positions between adjacent folding surfaces, and any one of the cutting positions is selected for cutting; there is a fiber cloth surplus after folding between adjacent folding surfaces, and the fiber cloth surplus is bonded with the fiber cloth of the adjacent folding surface and then sewed; the hollow rib position is prepared by the fiber cloth; S2. Prepare a+1 cylindrical molds, which are installed on both sides of the rib position; the cross section of the cylindrical mold is the same size as the hollow rib position; one side of the cylindrical mold is a convex structure, and the end of the convex structure has a bite structure; the other end of the cylindrical mold is a groove structure, and the inner side of the groove has a bite structure; the head and tail of the cylindrical molds can bite each other, and the bite structure is connected through the hollow part of the hollow rib position; S3. Add hollow ribs and column molds on the horizontal plane in sequence to form components; the length of the load-bearing square column can be adjusted; S4, prepare n pieces of winding fiber cloth, where n is a positive integer, the winding fiber cloth covers one side of the component, and all the hollow ribs are sewed to the winding fiber cloth by grooving; turn the component over until all four sides are sewed to the hollow ribs, and further sew the remaining winding fiber cloth to the winding fiber cloth by grooving; wrap the components assembled in step S3 in sequence, cover them with n layers of winding fiber cloth, sew them by grooving, and sew them to the upper layer of fiber cloth.
2. The ultra-light load-bearing square column preform and the preparation method thereof according to claim 1, characterized in that: The expanded diagram of the hollow rib position is a quadrilateral.
3. The ultra-light load-bearing square column preform and the preparation method thereof according to claim 2, characterized in that: Quadrilateral 1 and Quadrilateral 2 are defined within the quadrilateral; the quadrilateral, quadrilateral 1, and quadrilateral 2 are of equal proportions, have the same center point, and have four parallel sides; Quadrilateral 1 has the smallest area and is cut off along the shape of quadrilateral 1 as a hollow quadrilateral; Quadrilateral 2 serves as a folding line.
4. The ultra-light load-bearing square column preform and the preparation method thereof according to claim 2, characterized in that: The quadrilateral is a parallelogram or a rectangle.
5. The ultra-light load-bearing square column preform and the preparation method thereof according to claim 1, characterized in that: The column mold material is a non-metallic material with a flammability point not higher than 800°C.
6. The ultra-light load-bearing square column preform and the preparation method thereof according to claim 1, characterized in that: Each layer of wound fiber cloth starts at a different surface.