Reinforced fiber body pretreatment tool for cylindrical composite material and use method

Abstract

The invention relates to a cylindrical composite material reinforced fiber body pretreatment tool and a using method, and relates to the field of molds, the cylindrical composite material reinforced fiber body pretreatment tool comprises a male mold, a female mold, a guide column, a sliding block, a locking mechanism and cover plates, the cylindrical male mold is fixedly connected to the middle of the two layers of cover plates, and a to-be-formed fiber body is laid outside the male mold; the plurality of arc-shaped female dies are annularly arranged at the upper end and the lower end outside the fiber body or cover the middle part of the fiber body; the multiple guide columns are annularly distributed between the two layers of cover plates outside the female die at intervals, the multiple sliding blocks are connected to the guide columns in a sliding mode and connected with the female die through a locking mechanism so as to fix the position of the female die, and the tool has the advantages of being simple in structure, convenient and fast to operate, low in use cost and short in production period.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to a pretreatment tool for a reinforced fiber body of a cylindrical composite material and a use method thereof. Background Art

[0002] The development of aircraft has gone through low-speed, subsonic, supersonic, and hypersonic stages. With the continuous increase in aircraft speed, the requirements for composite materials of external thermal protection layers have become increasingly stringent. In addition to the improvement of the material's own performance, the material's molding has also gradually evolved from block bonding to overall preparation, aiming to minimize the joints on the aircraft surface and optimize the flow of air on its surface.

[0003] The overall outer heat protection layer of the aircraft is mostly a cylindrical structure with a small front and a large back. In order to ensure the molding quality of the product, the reinforced fiber body needs to have a certain amount of compression. That is, the outer surface of the reinforced fiber body needs to be controlled to a positive tolerance, otherwise there will be a problem of product surface floating glue due to the poor fit between the limit and the mold surface. However, too much compression will cause the following problems: Figure 6 As shown, the product surface wrinkle problem caused by the mismatch between the fiber circumference and the mold.

[0004] Given the low density, soft texture, and easy deformation of the fiber body, it is extremely difficult to control its dimensional accuracy. In addition, when the fiber body is removed from the transfer wooden mold and then put into the molding positive mold, unpredictable dimensional changes will occur. The molding mold is generally made of steel, which is opaque, so it is difficult to predict the compression state of the fiber after the mold is closed, which can easily make the product scrapped.

[0005] Therefore, in view of the above shortcomings, it is necessary to provide a pretreatment tool for reinforcing fiber bodies of cylindrical composite materials and a method for using the same. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] The technical problem to be solved by the present invention is to solve the problem that the compression amount is difficult to control during the fiber body forming process.

[0008] (II) Technical solution

[0009] In order to solve the above technical problems, the present invention provides a pretreatment tool for reinforced fiber bodies of cylindrical composite materials, including a male mold, a female mold, a guide column, a slider, a locking mechanism and a cover plate. The cylindrical male mold is fixedly connected to the middle of the two layers of cover plates, and the fiber body to be formed is laid outside the male mold. A plurality of arc-shaped female molds are arranged in a ring at the upper and lower ends of the outer fiber body or cover the middle of the fiber body; a plurality of guide columns are distributed in a ring shape between the two layers of cover plates outside the female mold, and a plurality of sliders are slidably connected to the guide columns and connected to the female mold through a locking mechanism to fix the position of the female mold.

[0010] As a further illustration of the present invention, preferably, the surface quality requirement for the middle area of ​​the fiber body after molding is low, and the female molds are distributed at the upper and lower ends of the fiber body with a distribution interval of 50 mm to 100 mm.

[0011] As a further illustration of the present invention, preferably, the surface quality requirement for the middle area of ​​the fiber body after molding is high, the female molds are spaced at the upper and lower ends and the middle of the fiber body, and the axial distance between two adjacent groups of female molds is 10mm to 20mm.

[0012] As a further illustration of the present invention, preferably, the female mold is a transparent arc-shaped structure, and the number of female molds forming a ring is not less than two.

[0013] As a further illustration of the present invention, preferably, a slide groove is provided on the guide column along its length direction, and a protrusion is provided in the slider to be embedded in the slide groove to limit the rotation of the slider.

[0014] As a further illustration of the present invention, preferably, the locking mechanism is a T-shaped rod, three locking mechanisms are threadedly connected to the slider, one locking mechanism abuts against the guide column, and two locking mechanisms extend into the female mold and are rotatably connected to the female mold.

[0015] As a further illustration of the present invention, preferably, a plurality of first positioning posts are inserted in a circular shape with irregular intervals on the cover plate, and the first positioning posts are inserted into the male mold.

[0016] As a further illustration of the present invention, preferably, a plurality of second positioning columns are inserted at intervals on the periphery of the cover plate, and the second positioning columns are inserted into the guide columns.

[0017] The present invention also provides a method for using a pretreatment tool for reinforcing fiber bodies of cylindrical composite materials, comprising the following steps:

[0018] Ⅰ. Insert the male mold into the designated position of the cover plate, and lay the fiber body to be formed outside the male mold;

[0019] Ⅱ. Insert the guide column into the designated position of the cover plate and position it, then insert the slider with the female mold into the guide column;

[0020] Ⅲ. Rotate the locking mechanism connected to the female mold so that the female mold does not contact the fiber body, and rotate the locking mechanism abutting against the guide column after sliding on the guide column to a specified position so that the slider and the guide column have an interference fit;

[0021] IV. After all the female mold positions are adjusted, the locking mechanism connected to the female mold is rotated to make the female mold contact with the fiber body, and the fiber body is compressed in cooperation with the male mold;

[0022] V. According to the creep characteristics of the fiber body, the surface state of the fiber body is effectively adjusted through multiple compressions to complete the pretreatment.

[0023] As a further explanation of the present invention, preferably, a transparent female mold is used to observe whether there is folding on the surface of the fiber body or poor fitting of the female mold, so as to predict whether wrinkles or abnormal state of surface floating glue will appear after the composite material is formed. If the state is abnormal, the compression of the fiber body is adjusted by adjusting the female mold before formal mold closing, glue injection and molding until the expected state is reached.

[0024] (III) Beneficial effects

[0025] The above technical solution of the present invention has the following advantages:

[0026] The newly designed tooling of the present invention has a simple structure, convenient operation, low cost, and a short production cycle of the fiber body. Combined with the method of use, the fiber reinforcement of the composite material can be pre-treated before formal mold closing, glue injection, and molding according to its physical properties, so that it can reach the desired profile state as much as possible, ensuring that the fiber body has sufficient compression while reducing the risk of wrinkles. On the other hand, the tooling can also be used to predict the state of the fiber body after formal mold closing, and if there is an abnormality, it can be adjusted in time to avoid product scrapping as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a general assembly effect diagram of the first embodiment of the present invention;

[0028] Figure 2 is a bottom view of embodiment 1 of the present invention;

[0029] Figure 3 This is a general assembly effect diagram of the second embodiment of the present invention;

[0030] Figure 4 is a partial cross-sectional view of the second embodiment of the present invention;

[0031] Figure 5 yes Figure 4 A magnified view of middle;

[0032] Figure 6 It is the surface image of the fiber body with wrinkle defects;

[0033] Figure 7 It is a surface diagram of the fiber body after molding of the present invention.

[0034] In the figure: 1, male mold; 2, female mold; 3, guide column; 31, slide groove; 4, slider; 5, locking mechanism; 6, cover plate; 61, first positioning column; 62, second positioning column; 7, fiber body. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] A pretreatment tool for reinforced fiber body of cylindrical composite material, combined with Figure 1 , Figure 3 , including a male mold 1, a female mold 2, a guide column 3, a slider 4, a locking mechanism 5 and a cover plate 6. The cylindrical male mold 1 is fixedly connected to the middle of the two layers of cover plates 6. The fiber body 7 to be formed is laid outside the male mold 1. A plurality of arc-shaped female molds 2 are arranged outside the fiber body 7 in a ring. A plurality of guide columns 3 are distributed between the two layers of cover plates 6 outside the female mold 2 in an annular shape. A plurality of sliders 4 are slidably connected to the guide columns 3 and connected to the female mold 2 through the locking mechanism 5, so as to adjust the female mold 2 to move up and down to a theoretical position.

[0037] Combination Figure 1 , Figure 3 The female mold 2 is a transparent arc-shaped structure, and after being assembled in place, the compression state of the fiber body 7 can be visually observed. The material of the female mold 2 needs to have good strength and mechanical processing performance. The number of female molds forming a ring is not less than two, which can be used to pre-press the fiber body 7 to adjust its contour size.

[0038] Combination Figure 1 , Figure 3 , the guide column 3 is a cylindrical rod, the slider 4 is a square slider, and the slider 4 is slidably connected to one or two guide columns 3. The locking mechanism 5 is a T-shaped rod, and three locking mechanisms 5 are threadedly connected to the slider 4, one locking mechanism 5 is in contact with the guide column 3, and two locking mechanisms 5 extend into the female mold 2 and are rotatably connected to the female mold 2. The locking mechanism 5 connected to the female mold 2 is also marked with a scale, which can fine-tune the position of the female mold 2 in the radial direction to apply different compression amounts to the fiber body 7. The cover plate 6 is a square plate, and the two layers of cover plates 6 are placed at the upper and lower ends of the fiber body 7 and are respectively connected to the male mold 1 and the guide column 3 to play a positioning role.

[0039] Due to the complexity of the shape of the cylindrical composite material and the different surface quality requirements for different areas, the present invention provides two embodiments to adapt to the pretreatment of different types of fiber bodies.

[0040] Embodiment 1:

[0041] When the shape of the cylindrical composite material is complex, the surface curvature varies greatly, and the surface quality requirements for the end area of ​​the component are high and the requirements for the middle area are low, the Figure 1 , Figure 2 , the female mold 2 can be set only at the two end portions of the fiber body 7 in the length direction, and the female mold 2 is not set in the middle, which can further save costs.

[0042] Combination Figure 1 , Figure 2 The number of the female molds 2 forming an annular shape is preferably three, which can enhance the pretreatment effect on the upper and lower end surfaces of the fiber body 7. The female molds 2 are distributed at the upper and lower ends of the fiber body 7 at a spacing of 50 mm to 100 mm, which can avoid the fiber body 7 being pressed into annular grooves due to a small height, and can also avoid the fiber body 7 being too high and having no targeted pretreatment effect on the surface.

[0043] Combination Figure 1 , Figure 2 Each guide column 3 is slidably connected to a slider 4, and a slide groove 31 is provided on the guide column 3 along its length direction. A protrusion is provided in the slider 4 and embedded in the slide groove 31 to limit the rotation of the slider 4, which is used to fix the other degrees of the slider 4 except the axial direction, thereby ensuring that the slider 4 and the female mold 2 can only move along the axial direction of the guide column 3. The guide column 3 is also marked with scales to achieve accurate adjustment of the position of the female mold 2, thereby allowing the fiber body 7 to obtain different compression amounts.

[0044] Embodiment 2:

[0045] When the shape of the cylindrical composite material component is relatively simple, approximately truncated cone, the surface curvature change is small, but the surface quality requirements of each area are high, combined with Figure 3 , Figure 4 , the outer surface of the fiber body 7 needs to be covered with female molds 2, and the axial distance between two adjacent groups of female molds 2 is 10mm to 20mm. In this embodiment, a slider 4 connects two guide posts 3, so the guide posts 3 do not need to be grooved, and the positioning is completed only by the locking mechanism 5. Figure 5 A plurality of first positioning posts 61 are inserted in an irregular annular pattern on the cover plate 6, and the first positioning posts 61 are inserted into the male mold 1. A plurality of second positioning posts 62 are inserted in the outer periphery of the cover plate 6, and the second positioning posts 62 are inserted into the guide posts 3. By providing the first positioning posts 61 and the second positioning posts 62, the installation positions of the guide posts 3 and the male mold 1 can be quickly positioned.

[0046] The present invention also provides a method for using a pretreatment tool for reinforcing fiber bodies of cylindrical composite materials, comprising the following steps:

[0047] Ⅰ. Insert the male mold 1 into the designated position of the cover plate 6, and lay the fiber body 7 to be formed outside the male mold 1;

[0048] Ⅱ. Insert the guide column 3 into the specified position of the cover plate 6 and position it, and then insert the slider 4 with the female mold 2 into the guide column 3;

[0049] Ⅲ. Rotate the locking mechanism 5 connected to the female mold 2 so that the female mold 2 does not contact the fiber body 7, and rotate the locking mechanism 5 abutting against the guide column 3 after sliding on the guide column 3 to make the slider 4 and the guide column 3 have an interference fit;

[0050] IV. After all the female molds 2 have been adjusted, the locking mechanism 5 connected to the female mold 2 is rotated to make the female mold 2 contact with the fiber body 7, and the fiber body 7 is compressed in cooperation with the male mold 1; for low density (e.g. 0.5 g / cm 3 For fiber bodies 7 with a density of less than 1 g / cm2, the reserved compression amount is usually about 0.5 mm to 1 mm (i.e., the profile of the female mold 2 is adjusted to +0.5 mm to +1 mm compared to the theoretical profile of the female mold 2); for fiber bodies with a higher density (e.g., 1 g / cm2), the reserved compression amount is usually about 0.5 mm to 1 mm (i.e., the profile of the female mold 2 is adjusted to +0.5 mm to +1 mm compared to the theoretical profile of the female mold 2); 3 The reserved compression amount of the fiber body 7 (above) is usually about 1mm to 2mm (that is, the profile of the female mold 2 is adjusted to +1mm to +2mm compared to the theoretical profile of the forming female mold 2).

[0051] V. If it is observed through the adjustment of the female mold 2 that some positions of the fiber body 7 do not fit the mold surface of the adjustment female mold 2 or wrinkles appear, the mold surface of the fiber body 7 can be adjusted by special tools until the adjustment of the female mold 2 can pre-compress the fiber body 7 without wrinkles appearing.

[0052] According to the different creep time characteristics of the fiber body 7, the compression state is maintained for a certain period of time, which usually ranges from several hours to several days. In the early stage, the creep characteristics of the fiber body can be explored through the non-contact three-dimensional scanning detection method, and targeted adjustments can be made during actual production.

[0053] In addition, the mold surface of the adjustment mold 2 is directly adjusted to the theoretical mold surface position of the forming mold 2 to compress the fiber body 7 in place. By observing the state of the fiber body 7 by adjusting the mold 2, the state of the fiber body 7 when the forming mold is in place can be predicted, thereby avoiding product scrapping to the greatest extent. If there is a phenomenon of non-fitting or wrinkles, the fiber body 7 is adjusted in time until it reaches the expected state, and finally the pretreatment is completed. The final product is as follows Figure 7 As shown, Figure 6 Compared with traditional methods, wrinkles are obviously eliminated, the surface is smoother, and the pre-treatment operation is obviously easier and more labor-saving.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pretreatment tool for reinforced fiber body of cylindrical composite material, characterized in that: The invention comprises a male mold (1), a female mold (2), a guide column (3), a slider (4), a locking mechanism (5) and a cover plate (6); the cylindrical male mold (1) is fixedly connected to the middle of two layers of cover plates (6); a fiber body (7) to be formed is laid outside the male mold (1); a plurality of arc-shaped female molds (2) are arranged in a ring shape at the upper and lower ends outside the fiber body (7) or cover the middle of the fiber body (7); a plurality of guide columns (3) are distributed in a ring shape between the two layers of cover plates (6) outside the female mold (2); a plurality of sliders (4) are slidably connected to the guide columns (3) and connected to the female mold (2) through the locking mechanism (5) to fix the position of the female mold (2).

2. The pretreatment tool for reinforced fiber body of a cylindrical composite material according to claim 1, characterized in that: The surface quality requirement for the middle area of ​​the fiber body after molding is low, and the female mold (2) is distributed at the upper and lower ends of the fiber body (7) with a distribution interval of 50mm to 100mm.

3. The pretreatment tool for reinforced fiber body of a cylindrical composite material according to claim 1, characterized in that: The surface quality requirement for the middle area of ​​the fiber body after molding is high. The female molds (2) are distributed at intervals at the upper and lower ends and the middle of the fiber body (7). The axial distance between two adjacent groups of female molds (2) is 10 mm to 20 mm.

4. The pretreatment tool for reinforced fiber body of a cylindrical composite material according to claim 1, characterized in that: The female mold (2) is a transparent arc-shaped structure, and the number of the female molds (2) forming a ring is not less than two.

5. The pretreatment tool for reinforced fiber body of a cylindrical composite material according to claim 1, characterized in that: A slide groove (31) is provided on the guide column (3) along its length direction, and a protrusion is provided in the slider (4) and is embedded in the slide groove (31) to limit the rotation of the slider (4).

6. The pretreatment tool for reinforced fiber body of a cylindrical composite material according to claim 1, characterized in that: The locking mechanism (5) is a T-shaped rod. Three locking mechanisms (5) are threadedly connected to the slider (4). One locking mechanism (5) abuts against the guide column (3). Two locking mechanisms (5) extend into the female mold (2) and are rotatably connected to the female mold (2).

7. The pretreatment tool for reinforced fiber body of a cylindrical composite material according to claim 1, characterized in that: A plurality of first positioning columns (61) are inserted into the cover plate (6) at irregular intervals in a ring shape, and the first positioning columns (61) are inserted into the male mold (1).

8. The pretreatment tool for reinforced fiber body of a cylindrical composite material according to claim 1, characterized in that: A plurality of second positioning columns (62) are inserted at intervals on the periphery of the cover plate (6), and the second positioning columns (62) are inserted into the guide columns (3).

9. The method for using the pretreatment tool for reinforcing fiber body of a cylindrical composite material according to claim 1, characterized in that: The following steps are involved: Ⅰ. Insert the male mold (1) into the designated position of the cover plate (6), and lay the fiber body (7) to be formed outside the male mold (1); Ⅱ. Insert the guide column (3) into the designated position of the cover plate (6) and position it, and then insert the slider (4) with the female mold (2) into the guide column (3); III. Rotating the locking mechanism (5) connected to the female mold (2) so that the female mold (2) does not contact the fiber body (7), and rotating the locking mechanism (5) in contact with the guide column (3) after sliding on the guide column (3) to a specified position so that the slider (4) and the guide column (3) are interference fit; IV. When the positions of all the female molds (2) are adjusted, the locking mechanism (5) connected to the female mold (2) is rotated to make the female mold (2) contact the fiber body (7), and cooperate with the male mold (1) to compress the fiber body (7); V. According to the creep characteristics of the fiber body (7), the surface state of the fiber body (7) is effectively adjusted through multiple compressions to complete the pretreatment.

10. The method for using the pretreatment tool for reinforced fiber body of a cylindrical composite material according to claim 9, characterized in that: By using the transparent female mold (2) to observe whether the fiber body (7) surface is folded or the female mold (2) is poorly fitted, it is predicted whether wrinkles or abnormal conditions of surface adhesive floating will occur after the composite material is formed. If the condition is abnormal, the female mold (2) is adjusted to compress the fiber body (7) and adjust its size before formal mold closing, adhesive injection, and forming until the expected condition is achieved.

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