A processing method for cutting into symmetric T-shaped workpieces

Abstract

The present invention discloses a processing method for cutting into symmetric T-shaped workpieces. The symmetric T-shaped workpieces are cut from H-shaped workpieces, and the H-shaped workpieces include an upper C-shaped prepreg flat plate and a lower C-shaped prepreg flat plate. The upper C-shaped prepreg flat plate includes a left upper L-shaped prepreg flat plate and a right upper L-shaped prepreg flat plate. The left upper L-shaped prepreg flat plate includes multiple layers of plies, and in the same coordinate system, a certain ply of the left upper L-shaped prepreg flat plate can be laid in the directions of 45°, -45°, 0° or 90°, while the plies of the corresponding right upper L-shaped prepreg flat plate are laid in the directions of -45°, 45°, 0° or 90°. The structure of the lower C-shaped prepreg flat plate and the laying method of each layer of plies are the same as those of the upper C-shaped prepreg flat plate, so that two completely symmetric T-shaped workpieces can be obtained after the H-shaped workpieces are cut, which can effectively improve the manufacturing efficiency of the T-shaped workpieces, shorten the manufacturing cycle and save raw materials.

Description

Technical Field

[0001] The invention relates to the technical field of composite material manufacturing, and in particular to a processing method for cutting a workpiece into symmetrical T-shaped parts. Background Art

[0002] Aircraft composite stiffened panels typically utilize a co-bonding process to bond the skin and stringers, often using either a "dry stringer + wet skin" or "wet stringer + dry skin" co-bonding process. Stringers used in stiffened panels typically come in a variety of structural forms, including I-shaped, T-shaped, and Ω-shaped.

[0003] T-shaped workpieces can be manufactured by splitting an H-shaped workpiece into two T-shaped workpieces. During manufacturing, the H-shaped workpiece must first be split into two upper and lower C-shaped preforms. The upper and lower C-shaped preforms are then assembled on an H-shaped workpiece fixture. The H-shaped workpiece is then hot-pressed and solidified to obtain an H-shaped workpiece, which is then split into T-shaped workpieces. However, when using this manufacturing method, unidirectional tape prepreg is used for laying, and the two resulting T-shaped workpieces are not symmetrical. To produce n symmetrical T-shaped workpieces, n H-shaped workpieces are required, which not only increases the amount of raw materials used, but also increases the manufacturing cycle and reduces manufacturing efficiency.

[0004] Therefore, a processing method for cutting into symmetrical T-shaped workpieces is urgently needed to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a processing method for cutting into symmetrical T-shaped workpieces, so as to improve the parts manufacturing efficiency, shorten the manufacturing cycle, and save the amount of raw materials used in the T-shaped workpiece forming process.

[0006] As conceived above, the technical solution adopted by the present invention is:

[0007] A processing method for cutting into symmetrical T-shaped workpieces, comprising:

[0008] Step 1: Design the net dimensions of the prepreg flat sheet. According to the net dimensions of the T-shaped workpiece, obtain the net dimensions of the upper left L-shaped prepreg flat sheet, the upper right L-shaped prepreg flat sheet, the lower left L-shaped prepreg flat sheet, and the lower right L-shaped prepreg flat sheet.

[0009] Step 2: Laying the prepreg flat sheet: using an automatic tape laying machine to lay the prepreg flat sheet on an automatic tape laying platform. The upper left L-shaped prepreg flat sheet includes multiple layers, and the upper right L-shaped prepreg flat sheet also includes multiple layers.

[0010] In the same coordinate system, a certain ply of the upper left L-shaped prepreg flat plate is laid at a 45° direction, while the corresponding ply of the upper right L-shaped prepreg flat plate is laid at a -45° direction, or a certain ply of the upper left L-shaped prepreg flat plate is laid at a -45° direction, while the corresponding ply of the upper right L-shaped prepreg flat plate is laid at a 45° direction, or a certain ply of the upper left L-shaped prepreg flat plate and the corresponding ply of the upper right L-shaped prepreg flat plate are both laid at a 0° direction, or a certain ply of the upper left L-shaped prepreg flat plate and the corresponding ply of the upper right L-shaped prepreg flat plate are both laid at a 90° direction;

[0011] In the same coordinate system, a certain ply of the lower left L-shaped prepreg flat plate is laid at a 45° direction, while the corresponding ply of the lower right L-shaped prepreg flat plate is laid at a -45° direction, or a certain ply of the lower left L-shaped prepreg flat plate is laid at a -45° direction, while the corresponding ply of the lower right L-shaped prepreg flat plate is laid at a 45° direction, or a certain ply of the lower left L-shaped prepreg flat plate and the corresponding ply of the lower right L-shaped prepreg flat plate are both laid at a 0° direction, or a certain ply of the lower left L-shaped prepreg flat plate and the corresponding ply of the lower right L-shaped prepreg flat plate are both laid at a 90° direction;

[0012] Step 3: Preforming treatment, bending the upper C-shaped prepreg flat plate to obtain an upper C-shaped preform; bending the lower C-shaped prepreg flat plate to obtain a lower C-shaped preform;

[0013] Step 4: H-shaped workpiece forming, assembling the upper C-shaped preform and the lower C-shaped preform on the H-shaped workpiece tooling, and performing autoclave forming treatment to obtain an H-shaped workpiece;

[0014] Step 5: T-shaped workpiece forming, cutting the web of the H-shaped workpiece along a direction perpendicular to the plane where the web of the H-shaped workpiece is located to obtain two T-shaped workpieces.

[0015] As a preferred solution of the processing method for cutting into symmetric T-shaped workpieces, in the step 2, it further includes using an ultrasonic cutting machine to cut the laid prepreg flat plate according to the net sizes of the various prepreg flat plates obtained in the step 1.

[0016] As a preferred solution of the processing method for cutting into symmetric T-shaped workpieces, in the step 3, for the bending treatment, the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate need to be respectively transferred to a hot diaphragm preforming tooling first, and a hot diaphragm machine is used to bend the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate respectively.

[0017] As a preferred solution of the processing method for cutting into symmetric T-shaped workpieces, in step 3, before transferring the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate to the hot diaphragm preforming tooling respectively, positioning holes need to be opened on the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate respectively, and the positioning holes are used to position the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate on the hot diaphragm preforming tooling.

[0018] As a preferred solution of the processing method for cutting into symmetric T-shaped workpieces, in step 4, the H-shaped workpiece tooling includes an upper C-shaped core mold, a lower C-shaped core mold, a left cover plate and a right cover plate. By placing the upper C-shaped preform on the upper C-shaped core mold, the lower C-shaped preform on the lower C-shaped core mold, flipping the upper C-shaped core mold and placing it above the lower C-shaped core mold, then placing the left cover plate on the left side of the upper C-shaped core mold and the lower C-shaped core mold, and placing the right cover plate on the right side of the upper C-shaped core mold and the lower C-shaped core mold, so that the upper C-shaped preform and the lower C-shaped preform are assembled on the H-shaped workpiece tooling, and a wick strip is clamped between the upper C-shaped preform, the lower C-shaped preform and the left cover plate, and between the upper C-shaped preform, the lower C-shaped preform and the right cover plate.

[0019] As a preferred solution of the processing method for cutting into symmetric T-shaped workpieces, the manufacturing steps of the H-shaped workpiece tooling include:

[0020] Drawing the digital model of the H-shaped workpiece: Drawing the digital model of the T-shaped workpiece, then performing three-dimensional mirroring on the digital model of the T-shaped workpiece to obtain the mirrored digital model of the T-shaped workpiece, and then symmetrically combining the digital model of the T-shaped workpiece and the mirrored digital model of the T-shaped workpiece to obtain the digital model of the H-shaped workpiece;

[0021] Disassembling the digital model of the H-shaped workpiece: Decomposing the digital model of the H-shaped workpiece into the digital model of the upper C-shaped preform and the digital model of the lower C-shaped preform;

[0022] Obtaining the H-shaped workpiece tooling: Manufacturing and obtaining the upper C-shaped core mold, the lower C-shaped core mold, the left cover plate and the right cover plate according to the dimensional structures of the digital model of the upper C-shaped preform and the digital model of the lower C-shaped preform.

[0023] As a preferred solution of the processing method for cutting into symmetric T-shaped workpieces, in step 4, an isolation film and a breather felt also need to be placed on the H-shaped workpiece tooling to paste a vacuum bag, and by performing air extraction treatment on the vacuum bag, the upper C-shaped preform is attached to the upper C-shaped core mold, and the lower C-shaped preform is attached to the lower C-shaped core mold.

[0024] As a preferred embodiment of the processing method for cutting into symmetric T-shaped workpieces, in step 4, the H-shaped workpiece obtained through the autoclave forming process also needs to be demolded so that the H-shaped workpiece is detached from the H-shaped workpiece tooling.

[0025] As a preferred embodiment of the processing method for cutting into symmetric T-shaped workpieces, in step 5, the cutting process requires transferring the H-shaped workpiece to a milling fixture, and then using a five-axis machine tool to cut the web of the H-shaped workpiece to obtain two T-shaped preforms.

[0026] As a preferred embodiment of the processing method for cutting into symmetric T-shaped workpieces, in step 4, the cutting process further includes trimming the ends of the T-shaped preforms to obtain the T-shaped workpieces.

[0027] The beneficial effects of the present invention are as follows:

[0028] A processing method for cutting into symmetric T-shaped workpieces proposed by the present invention includes five steps: sizing design of the prepreg flat plate, laying of the prepreg flat plate, preforming, forming of the H-shaped workpiece, and forming of the T-shaped workpiece. By bending the upper C-shaped prepreg flat plate to obtain an upper C-shaped preform, and bending the lower C-shaped prepreg flat plate to obtain a lower C-shaped preform. Then, the upper C-shaped preform and the lower C-shaped preform are assembled on the H-shaped workpiece tooling, and through autoclave forming, an H-shaped workpiece is obtained. Finally, by cutting the web of the H-shaped workpiece in a direction perpendicular to the plane where the web of the H-shaped workpiece is located, two T-shaped workpieces can be obtained.

[0029] The upper C-shaped prepreg flat plate includes a left-upper L-shaped prepreg flat plate with multiple layers and a right-upper L-shaped prepreg flat plate with multiple layers. In the same coordinate system, a certain layer of the left-upper L-shaped prepreg flat plate is laid at a 45° angle, while the corresponding layer of the right-upper L-shaped prepreg flat plate is laid at a -45° angle. Or a certain layer of the left-upper L-shaped prepreg flat plate is laid at a -45° angle, while the corresponding layer of the right-upper L-shaped prepreg flat plate is laid at a 45° angle. Or a certain layer of the left-upper L-shaped prepreg flat plate and the corresponding layer of the right-upper L-shaped prepreg flat plate are both laid at a 0° angle. Or a certain layer of the left-upper L-shaped prepreg flat plate and the corresponding layer of the right-upper L-shaped prepreg flat plate are both laid at a 90° angle. The structure of the lower C-shaped prepreg flat plate and the laying method of each layer are the same as those of the upper C-shaped prepreg flat plate. This enables the manufactured H-shaped workpiece to be cut into two completely symmetric T-shaped workpieces after cutting, which can effectively improve the manufacturing efficiency of the T-shaped workpiece, shorten the manufacturing cycle, and save raw materials. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the laying direction of a certain layer of multiple prepreg plates provided by an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the laying directions of multiple layers of multiple prepreg plates provided by an embodiment of the present invention;

[0032] Figure 3 It is an assembly schematic diagram of an H-shaped workpiece tooling, an upper C-shaped preform, a lower C-shaped preform, and a wick strip provided by an embodiment of the present invention.

[0033] In the figure:

[0034] 1. Upper C-shaped preform; 11. Upper left L-shaped prepreg plate; 12. Upper right L-shaped prepreg plate; 2. Lower C-shaped preform; 3. Wick strip;

[0035] 100. Upper C-shaped core mold; 200. Lower C-shaped core mold; 300. Left side cover plate; 400. Right side cover plate. Detailed implementation manners

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0038] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the tool table or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] In the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0042] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0043] This embodiment provides a processing method for cutting an H-shaped workpiece into symmetric T-shaped workpieces. Different from the traditional cutting manufacturing method, it can cut an H-shaped workpiece into two completely symmetric T-shaped workpieces. When used in the manufacturing and production of T-shaped stringers, two completely symmetric T-shaped stringers can be obtained in one manufacturing process, which can effectively improve the manufacturing efficiency, shorten the manufacturing cycle, and save the usage amount of raw materials during the forming process of T-shaped stringers.

[0044] The traditional slitting manufacturing method is to bend the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate into the upper C-shaped preform 1 and the lower C-shaped preform 2 respectively, and then hot-press the upper C-shaped preform 1 and the lower C-shaped preform 2 into an H-shaped workpiece, and finally slit the H-shaped workpiece into a T-shaped workpiece. The processing method for slitting into a symmetric T-shaped workpiece provided in this embodiment is mainly different from the traditional slitting manufacturing method in the laying of prepreg flat plates. As Figure 1 and Figure 2 shown, it is necessary to first lay the upper left L-shaped prepreg flat plate 11 and the upper right L-shaped prepreg flat plate 12 respectively to form the upper C-shaped prepreg flat plate, and lay the lower left L-shaped prepreg flat plate and the lower right L-shaped prepreg flat plate respectively to form the lower C-shaped prepreg flat plate, and then perform the above steps.

[0045] Specifically, both the upper left L-shaped prepreg flat plate 11 and the upper right L-shaped prepreg flat plate 12 include multiple layers. In the same coordinate system, as Figure 1 a shows, when a certain layer of the upper left L-shaped prepreg flat plate 11 is laid in the 45° direction, the corresponding layer of the upper right L-shaped prepreg flat plate 12 needs to be laid in the -45° direction. Or as Figure 1 b shows, when a certain layer of the upper left L-shaped prepreg flat plate 11 is laid in the -45° direction, the corresponding layer of the upper right L-shaped prepreg flat plate 12 needs to be laid in the 45° direction. Of course, it can also be as Figure 1 c shows, where a certain layer of the upper left L-shaped prepreg flat plate 11 and the corresponding layer of the upper right L-shaped prepreg flat plate 12 are both laid in the 0° direction. Or as Figure 1 d shows, where a certain layer of the upper left L-shaped prepreg flat plate 11 and the corresponding layer of the upper right L-shaped prepreg flat plate 12 are both laid in the 90° direction.

[0046] Consistently, there are also four ways to lay the lower C-shaped prepreg flat plate. One is that a certain layer of the lower left L-shaped prepreg flat plate is laid in the 45° direction, and the corresponding layer of the lower right L-shaped prepreg flat plate is laid in the -45° direction; the second is that a certain layer of the lower left L-shaped prepreg flat plate is laid in the -45° direction, and the corresponding layer of the lower right L-shaped prepreg flat plate is laid in the 45° direction; the third is that a certain layer of the lower left L-shaped prepreg flat plate and the corresponding layer of the lower right L-shaped prepreg flat plate are both laid in the 0° direction; the fourth is that a certain layer of the lower left L-shaped prepreg flat plate and the corresponding layer of the lower right L-shaped prepreg flat plate are both laid in the 90° direction.

[0047] Preferably, as Figure 2As shown, when a certain ply of the upper left L-shaped prepreg flat plate 11 is laid at a 45° direction, the other plies of the adjacent upper left L-shaped prepreg flat plate 11 are laid at -45°, 0° or 90° directions. When a certain ply of the upper left L-shaped prepreg flat plate 11 is laid at a -45° direction, the other plies of the adjacent upper left L-shaped prepreg flat plate 11 are laid at 45°, 0° or 90° directions.

[0048] In addition, the net laying dimensions of the upper left L-shaped prepreg flat plate 11, the upper right L-shaped prepreg flat plate 12, the lower left L-shaped prepreg flat plate and the lower right L-shaped prepreg flat plate need to be calculated before laying the prepreg flat plates. Since the processing method of cutting into symmetric T-shaped workpieces provided in this embodiment is for manufacturing T-shaped workpieces, the digital model of the H-shaped workpiece can be obtained according to the digital model of the T-shaped workpiece to be manufactured, and this step can be achieved through three-dimensional mirror processing. Then, according to the digital model of the H-shaped workpiece, the digital models of the upper C-shaped preform and the lower C-shaped preform are obtained, that is, evenly split along the plane where the web of the digital model of the H-shaped workpiece is located. Finally, according to the digital model of the upper C-shaped preform, the digital models of the upper left L-shaped workpiece and the upper right L-shaped workpiece are obtained, and according to the digital model of the lower C-shaped preform, the digital models of the lower left L-shaped workpiece and the lower right L-shaped workpiece are obtained.

[0049] Then, the three-dimensional surface structure of the digital model of the upper C-shaped preform is converted into a two-dimensional plane structure to obtain the net dimension of the upper left L-shaped prepreg flat plate 11. Based on the digital model of the upper right L-shaped workpiece, the net dimension of the upper right L-shaped prepreg flat plate 12 is obtained. Based on the digital model of the lower left L-shaped workpiece, the net dimension of the lower left L-shaped prepreg flat plate is obtained. Based on the digital model of the lower right L-shaped workpiece, the net dimension of the lower right L-shaped prepreg flat plate is obtained. After knowing the net dimensions of each part of the prepreg flat plates, they can be laid in layers according to the aforementioned laying directions.

[0050] Optionally, an automatic tape laying machine is used to lay the prepreg flat plates on an automatic tape laying table, and then an ultrasonic cutting machine is used to cut the laid prepreg flat plates, and the standard for this cutting is the net dimensions of various prepreg flat plates obtained in the aforementioned prepreg flat plate net dimension design steps.

[0051] Furthermore, the formed upper C-shaped prepreg flat plate is bent to obtain the upper C-shaped preform 1, and the formed lower C-shaped prepreg flat plate is bent to obtain the lower C-shaped preform 2. Specifically, when performing the bending treatment, the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate need to be transferred to the hot diaphragm preforming tooling respectively, and then a hot diaphragm machine is used to bend the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate respectively, so as to obtain the upper C-shaped preform 1 and the lower C-shaped preform 2. Using a hot diaphragm machine for bending treatment has high working efficiency, and the quality of the upper C-shaped preform 1 and the lower C-shaped preform 2 obtained through hot diaphragm forming treatment is better.

[0052] Optionally, in order to fix the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate on the hot diaphragm preforming tooling, positioning holes are respectively provided on the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate, and the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate can be respectively positioned on the hot diaphragm preforming tooling through the positioning holes.

[0053] Furthermore, the upper C-shaped preform 1 and the lower C-shaped preform 2 are assembled on the H-shaped workpiece tooling and subjected to autoclave molding treatment to obtain an H-shaped workpiece. As Figure 3 shown, the H-shaped workpiece tooling includes an upper C-shaped core mold 100, a lower C-shaped core mold 200, a left cover plate 300, and a right cover plate 400. During assembly, the upper C-shaped preform 1 needs to be placed on the upper C-shaped core mold 100, the lower C-shaped preform 2 needs to be placed on the lower C-shaped core mold 200, then the upper C-shaped core mold 100 is flipped and placed above the lower C-shaped core mold 200, and then the left cover plate 300 is placed on the left side of the upper C-shaped core mold 100 and the lower C-shaped core mold 200, and the right cover plate 400 is placed on the right side of the upper C-shaped core mold 100 and the lower C-shaped core mold 200, so that the upper C-shaped preform 1 and the lower C-shaped preform 2 are assembled on the H-shaped workpiece tooling. In addition, a wick strip 3 is clamped between the upper C-shaped preform 1, the lower C-shaped preform 2 and the left cover plate 300, and a wick strip 3 is clamped between the upper C-shaped preform 1, the lower C-shaped preform 2 and the right cover plate 400. Optionally, the wick strip 3 is formed by pultrusion of prepreg using a wick strip preforming device.

[0054] The H-shaped workpiece tooling needs to be designed in advance according to the dimensions of the to-be-made T-shaped workpiece. The steps of manufacturing the H-shaped workpiece tooling include three steps. First, draw the digital model of the H-shaped workpiece: draw the digital model of the T-shaped workpiece, then perform a three-dimensional mirroring process on the digital model of the T-shaped workpiece to obtain the mirrored digital model of the T-shaped workpiece, and then symmetrically combine the digital model of the T-shaped workpiece and the mirrored digital model of the T-shaped workpiece to obtain the digital model of the H-shaped workpiece. Second, disassemble the digital model of the H-shaped workpiece: decompose the digital model of the H-shaped workpiece into the digital model of the upper C-shaped preform and the digital model of the lower C-shaped preform. Third, obtain the H-shaped workpiece tooling: according to the dimensional structure of the digital model of the upper C-shaped preform and the digital model of the lower C-shaped preform, manufacture and obtain the upper C-shaped core mold 100, the lower C-shaped core mold 200, the left cover plate 300, and the right cover plate 400. In this embodiment, the upper C-shaped core mold 100 and the lower C-shaped core mold 200 are hard steel core molds. The surface grooves of the upper C-shaped core mold 100 and the lower C-shaped core mold 200 for placing the upper C-shaped preform 1 and the lower C-shaped preform are formed by milling processing, and their processing accuracy is high, which can effectively ensure the surface quality of the initially obtained T-shaped preform. The left cover plate 300 and the right cover plate 400 are both thin cover plates with a thickness less than 1 mm. In this embodiment, the thickness of the left cover plate 300 and the right cover plate 400 is 0.5 mm, and the materials of the left cover plate 300 and the right cover plate 400 are composite materials. Of course, in other embodiments, they can also be metal plate materials.

[0055] Optionally, to make the upper C-shaped preform 1 and the lower C-shaped preform 2 fit the H-shaped workpiece tooling, in the H-shaped workpiece forming step, it further includes placing an isolation film and a breather felt on the assembled H-shaped workpiece tooling to paste a vacuum bag, and by performing a pumping process on the vacuum bag, so that the upper C-shaped preform 1 is pressed against the upper C-shaped core mold 100, and the lower C-shaped preform 2 is pressed against the lower C-shaped core mold 200, which is beneficial to improving the quality of the H-shaped workpiece obtained after subsequent autoclave forming treatment.

[0056] Optionally, in the H-shaped workpiece forming step, the H-shaped workpiece formed by autoclave forming treatment also needs to be demolded so that the H-shaped workpiece is detached from the H-shaped workpiece tooling. In this embodiment, one H-shaped workpiece can be obtained through one autoclave curing treatment, and two symmetrical T-shaped workpieces can be obtained after cutting. Compared with the existing manufacturing method of T-shaped workpieces, the production efficiency is improved.

[0057] For the cutting treatment, the obtained H-shaped workpiece needs to be cut along the direction perpendicular to the plane where the web of the H-shaped workpiece is located. Specifically, when performing the cutting treatment, the H-shaped workpiece needs to be first transferred to the milling tooling, and then the web of the H-shaped workpiece is slit by using a five-axis machine tool to obtain two T-shaped preforms. Using a five-axis machine tool instead of manual cutting can greatly improve the cutting accuracy, reduce the cutting difficulty, and ensure the cutting quality.

[0058] After slitting, a five-axis machine tool can be further used to trim the ends of the slit T-shaped preforms to finally obtain two symmetrical T-shaped workpieces.

[0059] Note that the above are only the preferred embodiments of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A processing method for cutting into symmetric T-shaped workpieces, characterized in that, Including: Step 1: Design the net size of the prepreg flat plate. Obtain the net size of the upper left L-shaped prepreg flat plate (11), the net size of the upper right L-shaped prepreg flat plate (12), the net size of the lower left L-shaped prepreg flat plate, and the net size of the lower right L-shaped prepreg flat plate according to the net size of the T-shaped workpiece. Step 2: Lay the prepreg flat plates. Use an automatic tape laying machine to lay the prepreg flat plates on the automatic tape laying platform. The upper left L-shaped prepreg flat plate (11) includes multiple layers, and the upper right L-shaped prepreg flat plate (12) also includes multiple layers. In the same coordinate system, a certain layer of the upper left L-shaped prepreg flat plate (11) is laid in the 45° direction, while the corresponding layer of the upper right L-shaped prepreg flat plate (12) is laid in the -45° direction, or a certain layer of the upper left L-shaped prepreg flat plate (11) is laid in the -45° direction, while the corresponding layer of the upper right L-shaped prepreg flat plate (12) is laid in the 45° direction, or a certain layer of the upper left L-shaped prepreg flat plate (11) and the corresponding layer of the upper right L-shaped prepreg flat plate (12) are both laid in the 0° direction, or a certain layer of the upper left L-shaped prepreg flat plate (11) and the corresponding layer of the upper right L-shaped prepreg flat plate (12) are both laid in the 90° direction. In the same coordinate system, a certain layer of the lower left L-shaped prepreg flat plate is laid in the 45° direction, while the corresponding layer of the lower right L-shaped prepreg flat plate is laid in the -45° direction, or a certain layer of the lower left L-shaped prepreg flat plate is laid in the -45° direction, while the corresponding layer of the lower right L-shaped prepreg flat plate is laid in the 45° direction, or a certain layer of the lower left L-shaped prepreg flat plate and the corresponding layer of the lower right L-shaped prepreg flat plate are both laid in the 0° direction, or a certain layer of the lower left L-shaped prepreg flat plate and the corresponding layer of the lower right L-shaped prepreg flat plate are both laid in the 90° direction. Step 3: Pre-forming treatment. Bend the upper C-shaped prepreg flat plate to obtain the upper C-shaped preform (1). The upper C-shaped prepreg flat plate includes the upper left L-shaped prepreg flat plate (11) with multiple layers and the upper right L-shaped prepreg flat plate (12) with multiple layers. Bend the lower C-shaped prepreg flat plate to obtain the lower C-shaped preform (2). The lower C-shaped prepreg flat plate includes the lower left L-shaped prepreg flat plate with multiple layers and the lower right L-shaped prepreg flat plate with multiple layers. Step 4: Forming the H-shaped workpiece. Assemble the upper C-shaped preform (1) and the lower C-shaped preform (2) on the H-shaped workpiece tooling, and perform autoclave forming treatment to obtain the H-shaped workpiece. Step 5: Forming the T-shaped workpiece. Cut the web of the H-shaped workpiece along the direction perpendicular to the plane where the web of the H-shaped workpiece is located to obtain two T-shaped workpieces.

2. The processing method for cutting into symmetric T-shaped workpieces according to claim 1, characterized in that, In the step 2, it further includes using an ultrasonic cutting machine to cut the laid prepreg flat plate according to the net sizes of the various prepreg flat plates obtained in the step 1.

3. The processing method of cutting into symmetric T-shaped workpieces according to claim 1, characterized in that In the step 3, for the bending process, the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate need to be respectively transferred to a hot diaphragm preforming tooling, and a hot diaphragm machine is used to bend the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate respectively.

4. The processing method of slicing into symmetric T-shaped workpieces according to claim 3, characterized in that, In the step 3, before the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate are respectively transferred to the hot diaphragm preforming tooling, positioning holes need to be respectively opened on the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate, and the positioning holes are used to position the upper C-shaped prepreg flat plate and the lower C-shaped prepreg flat plate on the hot diaphragm preforming tooling.

5. The processing method for cutting into symmetric T-shaped workpieces according to claim 1, characterized in that, In the step 4, the H-shaped workpiece tooling includes an upper C-shaped core mold (100), a lower C-shaped core mold (200), a left side cover plate (300) and a right side cover plate (400). By placing the upper C-shaped preform (1) on the upper C-shaped core mold (100), the lower C-shaped preform (2) on the lower C-shaped core mold (200), flipping the upper C-shaped core mold (100) and placing it above the lower C-shaped core mold (200), then placing the left side cover plate (300) on the left side of the upper C-shaped core mold (100) and the lower C-shaped core mold (200), and placing the right side cover plate (400) on the right side of the upper C-shaped core mold (100) and the lower C-shaped core mold (200), so that the upper C-shaped preform (1) and the lower C-shaped preform (2) are assembled on the H-shaped workpiece tooling, and a wick strip (3) is clamped between the upper C-shaped preform (1), the lower C-shaped preform (2) and the left side cover plate (300), and between the upper C-shaped preform (1), the lower C-shaped preform (2) and the right side cover plate (400).

6. The processing method for cutting into symmetric T-shaped workpieces according to claim 5, characterized in that, The manufacturing steps of the H-shaped workpiece tooling include: Drawing the H-shaped workpiece digital model: Drawing the T-shaped workpiece digital model, then performing a three-dimensional mirroring process on the T-shaped workpiece digital model to obtain a mirrored T-shaped workpiece digital model, and then symmetrically combining the T-shaped workpiece digital model and the mirrored T-shaped workpiece digital model to obtain the H-shaped workpiece digital model; Disassembling the H-shaped workpiece digital model: Decomposing the H-shaped workpiece digital model into an upper C-shaped preform digital model and a lower C-shaped preform digital model; Obtaining the H-shaped workpiece tooling: Manufacturing and obtaining the upper C-shaped core mold (100), the lower C-shaped core mold (200), the left side cover plate (300) and the right side cover plate (400) according to the dimensional structures of the upper C-shaped preform digital model and the lower C-shaped preform digital model.

7. The processing method of cutting into symmetric T-shaped workpieces according to claim 5, characterized in that, In the step 4, an isolation film and a breather felt also need to be placed on the H-shaped workpiece tooling to paste a vacuum bag, and by performing a gas pumping process on the vacuum bag, the upper C-shaped preform (1) is made to fit onto the upper C-shaped core mold (100), and the lower C-shaped preform (2) is made to fit onto the lower C-shaped core mold (200).

8. The processing method for cutting into symmetric T-shaped workpieces according to claim 5, characterized in that, In the step 4, the H-shaped workpiece processed by the autoclave forming needs to be demolded so that the H-shaped workpiece is separated from the H-shaped workpiece tooling.

9. The processing method for cutting into symmetric T-shaped workpieces according to claim 1, characterized in that, In the step 5, the cutting process needs to transfer the H-shaped workpiece to a milling fixture, and then a five-axis machine tool is used to slit the web of the H-shaped workpiece to obtain two T-shaped preforms.

10. The processing method of slicing into symmetric T-shaped workpieces according to claim 9, characterized in that, In the step 4, the cutting process also includes trimming the ends of the T-shaped preform to obtain the T-shaped workpiece.

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