CN116197607A - Machining method for splitting paired T-shaped workpieces - Google Patents

Machining method for splitting paired T-shaped workpieces Download PDF

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Publication number
CN116197607A
CN116197607A CN202111455628.7A CN202111455628A CN116197607A CN 116197607 A CN116197607 A CN 116197607A CN 202111455628 A CN202111455628 A CN 202111455628A CN 116197607 A CN116197607 A CN 116197607A
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China
Prior art keywords
shaped
flat plate
prepreg
workpiece
certain layer
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CN202111455628.7A
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黄鸿胤
卢鑫
陈菲
吴臣君
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Shanghai Aircraft Manufacturing Co Ltd
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Shanghai Aircraft Manufacturing Co Ltd
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Priority to CN202111455628.7A priority Critical patent/CN116197607A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/40—Weight reduction

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  • Moulding By Coating Moulds (AREA)

Abstract

The invention discloses a processing method for splitting a paired T-shaped workpiece. The symmetrical T-shaped workpiece is formed by cutting an H-shaped workpiece, wherein the H-shaped workpiece comprises an upper C-shaped prepreg flat plate and a lower C-shaped prepreg flat plate, and the upper C-shaped prepreg flat plate comprises an upper left L-shaped prepreg flat plate and an upper right L-shaped prepreg flat plate. The upper left L-shaped prepreg plate comprises a plurality of layers, and under the same coordinate system, one layer of the upper left L-shaped prepreg plate can be paved in the direction of 45 degrees, -45 degrees, 0 degrees or 90 degrees, and the layer of the upper right L-shaped prepreg plate corresponding to the one layer of the upper left L-shaped prepreg plate can be paved in the direction of-45 degrees, 0 degrees or 90 degrees. The structure of the lower C-shaped prepreg flat and the paving method of each layer of paving layer are consistent with those of the upper C-shaped prepreg flat, so that two completely symmetrical T-shaped workpieces can be obtained after the manufactured H-shaped workpieces are cut, the manufacturing efficiency of the T-shaped workpieces can be effectively improved, the manufacturing period is shortened, and raw materials are saved.

Description

Machining method for splitting paired T-shaped workpieces
Technical Field
The invention relates to the technical field of composite material manufacturing, in particular to a processing method for splitting a symmetrical T-shaped workpiece.
Background
The aircraft composite stiffened panel part is typically formed by co-cementing the skin to the stringers using a "dry stringer+wet skin" or "wet stringer+dry skin" co-cementing process. The stringer components employed in the stiffened panel generally have a variety of different structural forms, such as I-shaped, T-shaped, omega-shaped, etc.
The T-shaped workpiece is manufactured by a method of dividing an H-shaped workpiece into two T-shaped workpieces, the H-shaped workpiece is divided into an upper C-shaped preformed piece and a lower C-shaped preformed piece firstly during manufacturing, then the upper C-shaped preformed piece and the lower C-shaped preformed piece are assembled on the H-shaped workpiece, and then the H-shaped workpiece is obtained through hot press solidification and is divided into the T-shaped workpiece. However, when the method is used for manufacturing, the unidirectional tape prepreg is adopted for paving, two T-shaped workpieces obtained through final cutting are not symmetrical parts, and if n symmetrical T-shaped workpieces are to be manufactured, n H-shaped workpieces are needed, so that the use amount of raw materials is increased, the manufacturing period is prolonged, and the manufacturing efficiency is reduced.
Therefore, a method of splitting a pair of T-shaped workpieces is needed to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a processing method for splitting a symmetrical T-shaped workpiece, which is used for improving the manufacturing efficiency of the part, shortening the manufacturing period and saving the consumption of raw materials in the T-shaped workpiece forming process.
The technical scheme adopted by the invention is as follows:
a method of machining a slit pair T-shaped workpiece comprising:
step 1: the method comprises the steps of designing the net size of a prepreg plate, and obtaining the net size of an upper left L-shaped prepreg plate, the net size of an upper right L-shaped prepreg plate, the net size of a lower left L-shaped prepreg plate and the net size of a lower right L-shaped prepreg plate according to the net size of a T-shaped workpiece;
step 2: paving a prepreg flat plate, wherein the prepreg flat plate is paved on an automatic tape paving platform by adopting an automatic tape paving machine, the upper left L-shaped prepreg flat plate comprises a plurality of layers of paving layers, and the upper right L-shaped prepreg flat plate also comprises a plurality of layers of paving layers;
in the same coordinate system, a certain layer of the left upper L-shaped prepreg plate is paved according to a 45-degree direction, a layer of the right upper L-shaped prepreg plate corresponding to the certain layer of the left upper L-shaped prepreg plate is paved according to a-45-degree direction, or a layer of the left upper L-shaped prepreg plate and a layer of the right upper L-shaped prepreg plate corresponding to the certain layer of the left upper L-shaped prepreg plate are paved according to a 0-degree direction, or a layer of the left upper L-shaped prepreg plate and a layer of the right upper L-shaped prepreg plate corresponding to the certain layer of the left upper L-shaped prepreg plate are paved according to a 90-degree direction;
in the same coordinate system, a certain layer of the left lower L-shaped prepreg flat plate is paved according to a 45-degree direction, a certain layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer of the left lower L-shaped prepreg flat plate is paved according to a-45-degree direction, a certain layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer of the left lower L-shaped prepreg flat plate is paved according to a 45-degree direction, a certain layer of the left lower L-shaped prepreg flat plate and a certain layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer of the left lower L-shaped prepreg flat plate are paved according to a 0-degree direction, or a certain layer of the left lower L-shaped prepreg flat plate and a certain layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer of the left lower L-shaped prepreg flat plate are paved according to a 90-degree direction;
step 3: performing, namely 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 preformed piece;
step 4: forming an H-shaped workpiece, namely assembling the upper C-shaped preformed piece and the lower C-shaped preformed piece on the H-shaped workpiece, and carrying out autoclave forming treatment to obtain an H-shaped workpiece;
step 5: and forming the T-shaped workpiece, and cutting the web plate of the H-shaped workpiece along the direction perpendicular to the plane of the web plate of the H-shaped workpiece so as to obtain two T-shaped workpieces.
As a preferable mode of the processing method for dividing into symmetrical T-shaped workpieces, in the step 2, cutting the laid prepreg flat with an ultrasonic cutter is further included in accordance with the net sizes of the plurality of prepreg flat obtained in the step 1.
As a preferable mode of the processing method for dividing the upper C-shaped prepreg flat and the lower C-shaped prepreg flat into symmetrical T-shaped workpieces, in the step 3, the bending process needs to transfer the upper C-shaped prepreg flat and the lower C-shaped prepreg flat onto a thermal diaphragm preform tool, and bend the upper C-shaped prepreg flat and the lower C-shaped prepreg flat by a thermal diaphragm machine, respectively.
As a preferable mode of the processing method for dividing the upper C-shaped prepreg plate and the lower C-shaped prepreg plate into symmetrical T-shaped workpieces, in the step 3, before transferring the upper C-shaped prepreg plate and the lower C-shaped prepreg plate to the thermal diaphragm preforming tool, positioning holes for positioning the upper C-shaped prepreg plate and the lower C-shaped prepreg plate on the thermal diaphragm preforming tool are also required to be opened on the upper C-shaped prepreg plate and the lower C-shaped prepreg plate, respectively.
As a preferable mode of the processing method of dividing into symmetrical T-shaped pieces, in the step 4, the H-shaped piece includes an upper C-shaped core mold, a lower C-shaped core mold, a left side cover plate and a right side 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, the upper C-shaped core mold is turned over and placed over the lower C-shaped core mold, and then the left side cover plate is placed on the left side of the upper C-shaped core mold and the lower C-shaped core mold, and the right side cover plate is placed 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 to the H-shaped piece with the upper C-shaped preform, the lower C-shaped preform and the left side cover plate and the upper C-shaped preform, the lower C-shaped preform and the right side cover plate interposed between the twisted strips.
As a preferable scheme of the processing method for dividing the symmetrical T-shaped workpiece, the manufacturing steps of the H-shaped workpiece tool comprise:
drawing H-shaped workpiece model: drawing a T-shaped workpiece die, performing three-dimensional mirror image processing on the T-shaped workpiece die to obtain a mirror image T-shaped workpiece die, and symmetrically combining the T-shaped workpiece die and the mirror image T-shaped workpiece die to obtain an H-shaped workpiece die;
disassembling the H-shaped workpiece die: decomposing the H-shaped workpiece number die into an upper C-shaped preformed workpiece number die and a lower C-shaped preformed workpiece number die;
obtaining an H-shaped workpiece tool: and 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 size structures of the upper C-shaped preformed number mold and the lower C-shaped preformed number mold.
As a preferable mode of the processing method for dividing and cutting the H-shaped workpiece into symmetrical T-shaped workpieces, in the step 4, a separator and an airfelt are further required to be placed on the H-shaped workpiece to paste a vacuum bag, and the upper C-shaped preform is attached to the upper C-shaped mandrel and the lower C-shaped preform is attached to the lower C-shaped mandrel by performing suction treatment on the vacuum bag.
In the step 4, the H-shaped workpiece subjected to the autoclave molding process is further subjected to a demolding process to separate the H-shaped workpiece from the H-shaped workpiece fixture.
As a preferred embodiment of the method for machining the symmetrical T-shaped workpiece, in the step 5, the cutting process is performed by transferring the H-shaped workpiece to a milling tool, and then cutting the web of the H-shaped workpiece by using a five-coordinate machine tool to obtain two T-shaped preforms.
As a preferable mode of the processing method of dividing into symmetrical T-shaped workpieces, in the step 4, the cutting process further includes trimming an end portion of the T-shaped preform to obtain the T-shaped workpiece.
The beneficial effects of the invention are as follows:
the invention provides a processing method for splitting a symmetrical T-shaped workpiece, which comprises five steps of prepreg flat net size design, prepreg flat laying, preforming treatment, H-shaped workpiece forming and T-shaped workpiece forming. The upper C-shaped prepreg flat is subjected to bending treatment to obtain an upper C-shaped preform, and the lower C-shaped prepreg flat is subjected to bending treatment to obtain a lower C-shaped preform. And then the upper C-shaped preformed piece and the lower C-shaped preformed piece are assembled on the H-shaped workpiece, and the H-shaped workpiece is obtained through autoclave molding treatment. Finally, cutting the web plate of the H-shaped workpiece along the direction perpendicular to the plane of the web plate of the H-shaped workpiece, so that two T-shaped workpieces can be obtained.
The upper C-shaped prepreg panel includes an upper left L-shaped prepreg panel having a plurality of plies and an upper right L-shaped prepreg panel having a plurality of plies. In the same coordinate system, a certain layer of the upper left L-shaped prepreg plate is paved and pasted according to the 45-degree direction, and a layer of the upper right L-shaped prepreg plate corresponding to the certain layer is paved and pasted according to the-45-degree direction. Or one layer of the upper left L-shaped prepreg plate is paved and stuck in the direction of-45 degrees, and the layer of the upper right L-shaped prepreg plate corresponding to the layer of the upper left L-shaped prepreg plate is paved and stuck in the direction of 45 degrees. Or a certain layer of the upper left L-shaped prepreg flat plate and a layer of the upper right L-shaped prepreg flat plate corresponding to the certain layer are paved in the direction of 0 degrees. Or a certain layer of the upper left L-shaped prepreg flat plate and a layer of the upper right L-shaped prepreg flat plate corresponding to the certain layer are paved and stuck in the 90-degree direction. The structure of the lower C-shaped prepreg plate and the paving method of each layer of paving are consistent with those of the upper C-shaped prepreg plate. Therefore, the manufactured H-shaped workpiece can be completely symmetrical to two T-shaped workpieces after being cut, the manufacturing efficiency of the T-shaped workpieces can be effectively improved, the manufacturing period is shortened, and raw materials are saved.
Drawings
FIG. 1 is a schematic illustration of lay-up direction of a lay-up of a plurality of prepreg sheets according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the lay-up direction of a multi-ply lay-up of a plurality of prepreg sheets provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an assembly of an H-shaped workpiece fixture with an upper C-shaped preform, a lower C-shaped preform, and a twisted ribbon, according to an embodiment of the present invention.
In the figure:
1. an upper C-shaped preform; 11. upper left L-prepreg plate; 12. upper right L-prepreg panel; 2. a lower C-shaped preform; 3. twisting the strips;
100. a C-shaped core mold is arranged on the upper part; 200. a lower C-shaped core mold; 300. a left side cover plate; 400. and a right cover plate.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the tool table or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
The present embodiment provides a method for cutting a symmetrical T-shaped workpiece, which is different from the conventional cutting manufacturing method, in that one H-shaped workpiece can be cut into two completely symmetrical T-shaped workpieces. When the method is used for manufacturing and producing the T-shaped stringers, two completely symmetrical T-shaped stringers can be obtained by one-time manufacturing, the manufacturing efficiency can be effectively improved, the manufacturing period can be shortened, and the consumption of raw materials in the T-shaped stringers in the forming process can be saved.
The conventional slitting manufacturing method is to bend an upper C-shaped prepreg flat and a lower C-shaped prepreg flat into an upper C-shaped preform 1 and a lower C-shaped preform 2, respectively, then heat-press the upper C-shaped preform 1 and the lower C-shaped preform 2 into H-shaped workpieces, and finally divide the H-shaped workpieces into T-shaped workpieces. The processing method for dividing and cutting into symmetrical T-shaped workpieces provided in this embodiment is different from the conventional dividing and cutting manufacturing method mainly in that prepreg flat plates are laid and pasted. As shown in fig. 1 and 2, it is necessary to lay down the upper left and right L-shaped prepreg sheets 11 and 12 to form upper C-shaped prepreg sheets, respectively, and lay down the lower left and right L-shaped prepreg sheets to form lower C-shaped prepreg sheets, respectively, and then perform the above steps.
Specifically, the upper left L-shaped prepreg flat plate 11 and the upper right L-shaped prepreg flat plate 12 each include a plurality of plies, and when one ply of the upper left L-shaped prepreg flat plate 11 is laid in a 45 ° direction, the corresponding ply of the upper right L-shaped prepreg flat plate 12 needs to be laid in a-45 ° direction under the same coordinate system as shown in fig. 1 a. Alternatively, as shown in FIG. 1b, when a certain ply of the upper left L-shaped prepreg sheet 11 is laid in a direction of-45 DEG, the corresponding ply of the upper right L-shaped prepreg sheet 12 needs to be laid in a direction of 45 deg. Of course, as shown in fig. 1c, a certain layer of the upper left L-shaped prepreg sheet 11 and a layer of the upper right L-shaped prepreg sheet 12 corresponding thereto may be laid in the 0 ° direction. Alternatively, as shown in fig. 1d, a certain ply of the upper left L-shaped prepreg sheet 11 and a ply of the upper right L-shaped prepreg sheet 12 corresponding thereto are laid in a 90 ° direction.
In accordance with the method, four paving modes are adopted for forming the lower C-shaped prepreg flat plate, namely, one certain paving layer of the lower left L-shaped prepreg flat plate is paved according to the 45-degree direction, and the corresponding paving layer of the lower right L-shaped prepreg flat plate is paved according to the-45-degree direction; secondly, paving a certain layer of the lower left L-shaped prepreg plate according to the direction of-45 degrees, and paving a layer of the lower right L-shaped prepreg plate corresponding to the certain layer according to the direction of 45 degrees; thirdly, paving a certain layer of the left lower L-shaped prepreg flat plate and a layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer in the 0-degree direction; and fourthly, paving a certain layer of the left lower L-shaped prepreg flat plate and a layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer in the 90-degree direction.
Preferably, as shown in fig. 2, when one ply of the upper left L-shaped prepreg sheet 11 is laid in a 45 ° direction, the other ply of the upper left L-shaped prepreg sheet 11 adjacent thereto is laid in a-45 °, 0 ° or 90 ° direction. When one ply of the upper left L-shaped prepreg sheet 11 is laid in the-45 DEG direction, the other ply of the upper left L-shaped prepreg sheet 11 adjacent thereto is laid in the 45 DEG, 0 DEG or 90 DEG direction.
In addition, the lay-up net dimensions of the upper left L-shaped prepreg sheet 11, the upper right L-shaped prepreg sheet 12, the lower left L-shaped prepreg sheet, and the lower right L-shaped prepreg sheet need to be calculated before the prepreg sheets are laid up. Because the processing method for dividing the symmetrical T-shaped workpiece into the two parts is provided in this embodiment, in order to manufacture the T-shaped workpiece, the H-shaped workpiece die can be obtained according to the T-shaped workpiece die to be manufactured, and this step can be obtained by three-dimensional mirror image processing. And obtaining an upper C-shaped preformed piece number die and a lower C-shaped preformed piece number die according to the H-shaped piece number die, namely uniformly splitting along a plane parallel to a web plate of the H-shaped piece number die. Finally, an upper left L-shaped workpiece die and an upper right L-shaped workpiece die are obtained according to the upper C-shaped preformed workpiece die, and a lower left L-shaped workpiece die and a lower right L-shaped workpiece die are obtained according to the lower C-shaped preformed workpiece die.
And then converting the three-dimensional curved surface structure of the upper C-shaped preformed piece number die into a two-dimensional plane structure to obtain the net size of the upper left L-shaped prepreg flat plate 11, obtaining the net size of the upper right L-shaped prepreg flat plate 12 based on the upper right L-shaped piece number die, obtaining the net size of the lower left L-shaped prepreg flat plate based on the lower left L-shaped piece number die, obtaining the net size of the lower right L-shaped prepreg flat plate based on the lower right L-shaped piece number die, and layering and pasting according to the pasting direction after knowing the net size of each part of prepreg flat plate.
Alternatively, the prepreg flat is laid on an automatic tape laying table by using an automatic tape laying machine, and then the laid prepreg flat is cut by using an ultrasonic cutting machine, and the standard of the cutting is the net size of various prepreg flat obtained by the net size design step of the prepreg flat.
Further, the formed upper C-shaped prepreg flat plate is subjected to a bending process to obtain an upper C-shaped preform 1, and the formed lower C-shaped prepreg flat plate is subjected to a bending process to obtain a lower C-shaped preform 2. Specifically, in the bending process, it is necessary to transfer the upper C-type prepreg flat plate and the lower C-type prepreg flat plate to the thermal separator preform tool, respectively, and then bend the upper C-type prepreg flat plate and the lower C-type prepreg flat plate, respectively, by using the thermal separator, thereby obtaining the upper C-type preform 1 and the lower C-type preform 2. The bending treatment by using the thermal diaphragm machine has high working efficiency, and the quality of the upper C-shaped preformed piece 1 and the lower C-shaped preformed piece 2 obtained after the thermal diaphragm forming treatment is better.
Alternatively, in order to achieve the fixation of the upper C-type prepreg plate and the lower C-type prepreg plate on the thermal diaphragm pre-forming tool, positioning holes are respectively provided on the upper C-type prepreg plate and the lower C-type prepreg plate, and the upper C-type prepreg plate and the lower C-type prepreg plate can be respectively positioned on the thermal diaphragm pre-forming tool through the positioning holes.
Further, the upper C-shaped preform 1 and the lower C-shaped preform 2 are assembled on an H-shaped workpiece tool, and subjected to autoclave molding treatment to obtain an H-shaped workpiece. As shown in fig. 3, the H-shaped workpiece fixture includes an upper C-core mold 100, a lower C-core mold 200, a left cover plate 300, and a right cover plate 400. In the assembly, it is necessary to place the upper C-type preform 1 on the upper C-type core mold 100, place the lower C-type preform 2 on the lower C-type core mold 200, then turn over the upper C-type core mold 100 and place it over the lower C-type core mold 200, and place the left cover plate 300 on the left side of the upper C-type core mold 100 and the lower C-type core mold 200 and the right cover plate 400 on the right side of the upper C-type core mold 100 and the lower C-type core mold 200, thereby assembling the upper C-type preform 1 and the lower C-type preform 2 on the H-type workpiece. In addition, a twisted piece 3 is sandwiched between the upper C-shaped preform 1, the lower C-shaped preform 2, and the left cover plate 300, and a twisted piece 3 is sandwiched between the upper C-shaped preform 1, the lower C-shaped preform 2, and the right cover plate 400. Alternatively, the twisted sliver 3 is pultruded with prepreg by a sliver preforming device.
The H-shaped workpiece tool needs to be designed in advance by the size of the T-shaped workpiece to be manufactured. The method for manufacturing the H-shaped workpiece fixture comprises three steps, namely, drawing an H-shaped workpiece die: drawing a T-shaped workpiece die, performing three-dimensional mirror image processing on the T-shaped workpiece die to obtain a mirror image T-shaped workpiece die, and symmetrically combining the T-shaped workpiece die and the mirror image T-shaped workpiece die to obtain an H-shaped workpiece die; secondly, disassembling the H-shaped workpiece die: decomposing the H-shaped workpiece die into an upper C-shaped preformed workpiece die and a lower C-shaped preformed workpiece die; thirdly, an H-shaped workpiece tool is obtained: the upper C-core mold 100, the lower C-core mold 200, the left cover plate 300 and the right cover plate 400 are manufactured according to the dimensional structures of the upper C-type preform number mold and the lower C-type preform number mold. In this embodiment, the upper C-core mold 100 and the lower C-core mold 200 are hard steel core molds. The upper C-core mold 100 and the lower C-core mold 200 are used for placing the profile grooves of the upper C-shaped preform 1 and the lower C-shaped preform, which are formed by milling processing, and have high processing precision, and can effectively ensure the surface quality of the T-shaped preform that is initially obtained. The left side cover 300 and the right side cover 400 are thin cover plates with a thickness less than 1mm, in this embodiment, the thickness of the left side cover 300 and the right side cover 400 is 0.5mm, and the materials of the left side cover 300 and the right side cover 400 are composite materials, but in other embodiments, the materials of the left side cover 300 and the right side cover 400 may be metal plates.
Optionally, in order to make the upper C-shaped preform 1 and the lower C-shaped preform 2 fit with the H-shaped workpiece, in the H-shaped workpiece forming step, a spacer film and an airfelt are placed on the H-shaped workpiece which is assembled and combined, so as to paste a vacuum bag, and the vacuum bag is subjected to air suction treatment, so that the upper C-shaped preform 1 is pressed against the upper C-shaped mandrel 100, and the lower C-shaped preform 2 is pressed against the lower C-shaped mandrel 200, which is beneficial to improving the quality of the H-shaped workpiece obtained after the subsequent autoclave forming treatment.
Optionally, in the H-shaped workpiece forming step, the H-shaped workpiece subjected to autoclave forming treatment is further subjected to demolding treatment, so that the H-shaped workpiece is separated from the H-shaped workpiece fixture. In the embodiment, an H-shaped workpiece can be obtained through one autoclave curing treatment, and two symmetrical T-shaped workpieces can be obtained after cutting, so that the production efficiency is improved compared with the existing T-shaped workpiece manufacturing method.
The cutting process is to cut the web of the H-shaped workpiece from a direction perpendicular to the plane of the web of the H-shaped workpiece. Specifically, when the cutting process is performed, the H-shaped workpiece needs to be transferred to a milling tool, and then a five-coordinate machine tool is used for cutting a web plate of the H-shaped workpiece so as to obtain two T-shaped preformed pieces. The five left machine tools are adopted to replace manual cutting, so that the cutting precision can be greatly improved, the cutting difficulty is reduced, and the cutting quality is ensured.
After the cutting is completed, the end part of the cut T-shaped preformed piece can be further trimmed by adopting a five-coordinate machine tool, so that two symmetrical T-shaped workpieces are finally obtained.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims (10)

1. A method of machining a slit pair T-shaped workpiece comprising:
step 1: the net size of the prepreg flat plate is designed, and 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 are obtained according to the net size of the T-shaped workpiece;
step 2: paving a prepreg flat plate, wherein the prepreg flat plate is paved on an automatic tape paving platform by adopting an automatic tape paving machine, the upper left L-shaped prepreg flat plate (11) comprises a plurality of layers of paving layers, and the upper right L-shaped prepreg flat plate (12) also comprises a plurality of layers of paving layers;
in the same coordinate system, a certain layer of the left upper L-shaped prepreg flat plate (11) is paved according to the 45-degree direction, a certain layer of the right upper L-shaped prepreg flat plate (12) corresponding to the certain layer of the left upper L-shaped prepreg flat plate is paved according to the-45-degree direction, or a certain layer of the left upper L-shaped prepreg flat plate (11) is paved according to the-45-degree direction, a certain layer of the right upper L-shaped prepreg flat plate (12) corresponding to the certain layer of the left upper L-shaped prepreg flat plate is paved according to the 45-degree direction, or a certain layer of the left upper L-shaped prepreg flat plate (11) and a certain layer of the right upper L-shaped prepreg flat plate (12) corresponding to the certain layer of the left upper L-shaped prepreg flat plate are paved according to the 0-degree direction, or a certain layer of the left upper L-shaped prepreg flat plate (11) and a certain layer of the right upper L-shaped prepreg flat plate (12) corresponding to the certain layer of the left upper L-shaped prepreg flat plate are paved according to the 90-degree;
in the same coordinate system, a certain layer of the left lower L-shaped prepreg flat plate is paved according to a 45-degree direction, a certain layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer of the left lower L-shaped prepreg flat plate is paved according to a-45-degree direction, a certain layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer of the left lower L-shaped prepreg flat plate is paved according to a 45-degree direction, a certain layer of the left lower L-shaped prepreg flat plate and a certain layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer of the left lower L-shaped prepreg flat plate are paved according to a 0-degree direction, or a certain layer of the left lower L-shaped prepreg flat plate and a certain layer of the right lower L-shaped prepreg flat plate corresponding to the certain layer of the left lower L-shaped prepreg flat plate are paved according to a 90-degree direction;
step 3: performing a bending process on the upper C-shaped prepreg flat plate to obtain an upper C-shaped preform (1); bending the lower C-shaped prepreg flat plate to obtain a lower C-shaped preform (2);
step 4: forming an H-shaped workpiece, namely assembling the upper C-shaped preform (1) and the lower C-shaped preform (2) on the H-shaped workpiece, and carrying out autoclave forming treatment to obtain an H-shaped workpiece;
step 5: and forming the T-shaped workpiece, and cutting the web plate of the H-shaped workpiece along the direction perpendicular to the plane of the web plate of the H-shaped workpiece so as to obtain two T-shaped workpieces.
2. The method of claim 1, further comprising cutting the laid prepreg sheet with an ultrasonic cutting machine according to the net sizes of the plurality of prepreg sheets obtained in step 1.
3. The method according to claim 1, wherein in the step 3, the bending process is performed by transferring the upper C-type prepreg sheet and the lower C-type prepreg sheet to a thermal separator preform, respectively, and bending the upper C-type prepreg sheet and the lower C-type prepreg sheet with a thermal separator.
4. The method of claim 3, wherein in step 3, before transferring the upper and lower C-type prepreg plates to the thermal membrane preforming tool, positioning holes are formed in the upper and lower C-type prepreg plates, respectively, for positioning the upper and lower C-type prepreg plates on the thermal membrane preforming tool.
5. The method of claim 1, wherein in step 4, the H-shaped workpiece comprises an upper C-core mold (100), a lower C-core mold (200), a left side cover plate (300) and a right side cover plate (400), wherein the upper C-shaped preform (1) and the lower C-shaped preform (2) are assembled to the lower C-core mold (200) by placing the upper C-core mold (100) on the right side of the upper C-core mold (100), the upper C-core mold (100) is turned over and placed over the lower C-core mold (200), and then the left side cover plate (300) is placed on the left side of the upper C-core mold (100) and the lower C-core mold (200), so that the upper C-shaped preform (1) and the lower C-shaped preform (2) are assembled to the upper C-core mold (100) and the lower C-core mold (200), and the left side cover plate (400) is placed between the upper C-shaped preform (1), the lower C-shaped preform (2) and the left side cover plate (400).
6. The method of claim 5, wherein the step of manufacturing the H-shaped workpiece fixture comprises:
drawing H-shaped workpiece model: drawing a T-shaped workpiece die, performing three-dimensional mirror image processing on the T-shaped workpiece die to obtain a mirror image T-shaped workpiece die, and symmetrically combining the T-shaped workpiece die and the mirror image T-shaped workpiece die to obtain an H-shaped workpiece die;
disassembling the H-shaped workpiece die: decomposing the H-shaped workpiece number die into an upper C-shaped preformed workpiece number die and a lower C-shaped preformed workpiece number die;
obtaining an H-shaped workpiece tool: 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) are manufactured and obtained according to the dimensional structures of the upper C-shaped preformed number mold and the lower C-shaped preformed number mold.
7. The method of claim 5, wherein in step 4, a spacer film and an airfelt are further placed on the H-shaped workpiece to paste a vacuum bag, and the upper C-shaped preform (1) is attached to the upper C-core mold (100) and the lower C-shaped preform (2) is attached to the lower C-core mold (200) by evacuating the vacuum bag.
8. The method according to claim 5, wherein in step 4, the H-shaped workpiece subjected to the autoclave molding process is further subjected to a demolding process to separate the H-shaped workpiece from the H-shaped workpiece fixture.
9. The method of claim 1, wherein in step 5, the cutting process requires transferring the H-shaped workpiece to a milling tool and then slitting the web of the H-shaped workpiece using a five-coordinate machine to obtain two T-shaped preforms.
10. The method of claim 9, wherein in step 4, the cutting process further comprises trimming the ends of the T-shaped preform to obtain the T-shaped workpiece.
CN202111455628.7A 2021-12-01 2021-12-01 Machining method for splitting paired T-shaped workpieces Pending CN116197607A (en)

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