A stamping tool for thermoplastic composite bending structure

Abstract

The utility model discloses a kind of stamping tool of thermoplastic composite bending structure, it is related to composite material tooling technical field.The stamping tool of thermoplastic composite bending structure proposed in the utility model, when female die mechanism and male die mechanism close mould, female surface group will thermoplastic composite be pressed to male die surface, to make thermoplastic composite be shaped as finished product in bending structure, in the process of closing mould, its movable surface is first contacted with the top of thermoplastic composite in the process of top stamping piece in the process of closing mould, and with the progress of closing mould, top stamping piece slowly compresses elastic member after pressing the top of thermoplastic composite, and the elastic force of elastic member to top stamping piece generates reaction, so that thermoplastic composite top surface is always in sufficient stress state in the process of closing mould, so that thermoplastic composite overall stress is more uniform, overcome the defect of insufficient stress on top, improve the forming quality of thermoplastic composite.

Description

Technical Field

[0001] This utility model relates to the field of composite material tooling technology, and in particular to a stamping tooling for a thermoplastic composite bending structure. Background Technology

[0002] Continuous fiber reinforced thermoplastic composites, or thermoplastic composites for short, are gradually replacing traditional metals and thermosetting composites in the aerospace field due to their lightweight, high toughness, rapid prototyping, weldability, and recyclability. The low-density, high-strength thermoplastic composites used in commercial aircraft not only reduce aircraft weight and save fuel, but also allow for the production of thermoplastic composite components in minutes using stamping processes (compared to several hours for autoclave molding of thermosetting composites), enabling high-efficiency and low-cost manufacturing of structural products.

[0003] Commercial aircraft fuselages, wings, and tail sections use a large number of connecting tabs, covering various configurations such as L, C, and Z. Among them, the difficulty in manufacturing the complex four-sided bending configuration of thermoplastic composites using stamping is that unreasonable stamping tooling design leads to insufficient pressure on the top of the multi-sided bending structure of thermoplastic composites, which in turn leads to defects such as out-of-tolerance porosity and excessive glue in the multi-sided bending structure of thermoplastic composites.

[0004] Therefore, there is an urgent need to provide a solution to the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a stamping fixture for bending thermoplastic composites, which solves the problem in the prior art where unreasonable stamping fixture design leads to insufficient pressure on the top of the thermoplastic composite, resulting in excessive porosity and excessive glue in the thermoplastic composite.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] A stamping fixture for bending thermoplastic composites includes a female die mechanism and a male die mechanism. The female die mechanism has a stamping groove, the groove wall of which has a female face assembly. The male die mechanism has a stamping protrusion, the surface of which has a male face. The male face can support the thermoplastic composite, and the female face assembly can move toward the male face to stamp the thermoplastic composite. The female die mechanism includes a female die body and a top stamping assembly. The female die body has a through groove penetrating the stamping groove and has a fixed profile. The top stamping assembly includes a top stamping part, a fastener, and an elastic element. The top stamping part is movably disposed in the through groove. The top stamping part has a movable hole. The female mold body has a fixed hole. The movable hole corresponds to the fixed hole. One end of the fastener can pass through the movable hole along the stamping direction and can be fixed in the fixed hole. The other end of the fastener has a limiting protrusion. The elastic element is sleeved on the fastener. One end of the elastic element is connected to the limiting protrusion and the other end is connected to the top stamping part. The lower end of the top stamping part has a movable surface. The fixed surface and the movable surface together form the female surface group.

[0008] In some embodiments, the female mold body is provided with a connecting lug at the upper end of the through groove, and the connecting lug is provided with the fixing hole along the stamping direction.

[0009] In some embodiments, the upper end of the top stamping part is provided with a fixing ear, and the fixing ear is provided with the movable hole along the stamping direction.

[0010] In some embodiments, the fixed surface includes three connected fixed sub-surfaces, with adjacent fixed sub-surfaces being perpendicular to each other.

[0011] In some embodiments, adjacent fixed sub-surfaces form a circular arc transition.

[0012] In some embodiments, the movable surface includes three connected movable sub-surfaces, adjacent movable sub-surfaces are perpendicular to each other, and the three movable sub-surfaces are configured in a one-to-one correspondence with the three fixed sub-surfaces.

[0013] In some embodiments, adjacent active sub-surfaces are connected by a circular arc transition.

[0014] In some embodiments, the fastener has an external threaded section at the end away from the limiting protrusion, the fixing hole has an internal thread, and the fastener is threadedly engaged with the fixing hole.

[0015] In some embodiments, an anti-slip sheet is provided on the male model surface, and the anti-slip sheet can abut against the thermoplastic composite material.

[0016] In some embodiments, a plurality of anti-slip pads are provided, and the plurality of anti-slip pads are spaced apart on the male model surface.

[0017] The beneficial effects of this utility model are:

[0018] This utility model proposes a stamping fixture for bending thermoplastic composites, comprising a female die mechanism and a male die mechanism. The female die mechanism has a stamping groove, the groove wall of which has a female profile assembly. The male die mechanism has a stamping protrusion, the surface of which has a male profile assembly. The male profile assembly can support the thermoplastic composite, and the female profile assembly can move toward the male profile assembly to stamp the thermoplastic composite. The female die mechanism includes a female die body and a top stamping assembly. The female die body has a through groove that passes through the stamping groove and has a fixed profile. The top stamping assembly includes a top... The die body comprises a stamped part, a fastener, and an elastic element. The top stamped part is movably disposed in a through slot and has a movable hole. The female die body has a fixed hole, and the movable hole corresponds to the fixed hole. One end of the fastener can pass through the movable hole along the stamping direction and be fixed in the fixed hole. The other end of the fastener has a limiting protrusion. The elastic element is sleeved on the fastener, and one end of the elastic element abuts against the limiting protrusion and the other end abuts against the top stamped part. The lower end of the top stamped part has a movable profile. The fixed profile and the movable profile together form a female profile group. When the female mold mechanism moves toward the male mold mechanism, the female mold surface assembly and the male mold surface move toward each other. Since the male mold surface can support the thermoplastic composite, when the female mold mechanism and the male mold mechanism close, the female mold surface assembly presses the thermoplastic composite against the male mold surface, thereby shaping the thermoplastic composite into a finished product with a bent structure. During the mold closing process, because the top stamping part is connected to the elastic part, and the elastic part is connected to the limiting protrusion on the fastener installed on the female mold body, the movable surface of the top stamping part first contacts the top of the thermoplastic composite during the mold closing process, and then moves with the mold closing mechanism. During the molding process, the top stamping part presses down on the top of the thermoplastic composite and then slowly compresses the elastic part. The elastic part generates a reaction force on the top stamping part, ensuring that the top surface of the thermoplastic composite is always under sufficient stress during the mold closing process. Finally, when the fixed surface contacts the thermoplastic composite, the top and side surfaces of the thermoplastic composite are simultaneously stressed, resulting in a more uniform stress distribution on the thermoplastic composite as a whole. This overcomes the defect of insufficient top stress, thereby avoiding excessive porosity deviation, delamination, and excessive glue in the thermoplastic composite, and improving the molding quality of the thermoplastic composite. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0020] Figure 1This is an exploded view of a stamping fixture with a thermoplastic composite bending structure according to an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the female mold body according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the top stamping part according to an embodiment of the present invention;

[0023] Figure 4 This is a structural schematic diagram of the fastener according to an embodiment of the present utility model.

[0024] In the picture:

[0025] 1. Female mold mechanism; 11. Female mold body; 111. Stamping groove; 112. Fixed surface; 113. Connecting ear; 1131. Fixing hole; 12. Top stamping assembly; 121. Top stamping part; 1211. Fixing ear; 12111. Movable hole; 122. Fastener; 1221. Limiting protrusion; 123. Elastic element; 124. Washer; 125. Movable surface; 2. Male mold mechanism; 21. Male mold surface; 3. Anti-slip plate. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0030] This embodiment proposes a stamping fixture for bending thermoplastic composites, which solves the problem in the prior art where unreasonable stamping fixture design leads to insufficient pressure on the top of the thermoplastic composite, resulting in excessive porosity and glue accumulation in the thermoplastic composite.

[0031] like Figures 1-4 As shown, a stamping fixture for bending thermoplastic composites includes a female die mechanism 1 and a male die mechanism 2. The female die mechanism 1 has a stamping groove 111, and the groove wall of the stamping groove 111 has a female face assembly. The male die mechanism 2 has a stamping protrusion, and the surface of the stamping protrusion has a male face 21. The male face 21 can support the thermoplastic composite, and the female face assembly can move toward the male face 21 to stamp the thermoplastic composite. The female die mechanism 1 includes a female die body 11 and a top stamping assembly 12. The female die body 11 has a through groove that passes through the stamping groove 111 and has a fixed face 112. The top stamping assembly 12 includes a top stamping part 121, a fastener 122, and an elastic member 123. 21 is movably disposed in the through groove. The top stamping part 121 has a movable hole 12111. The female mold body 11 has a fixed hole 1131. The movable hole 12111 corresponds to the fixed hole 1131. One end of the fastener 122 can pass through the movable hole 12111 along the stamping direction and can be fixed in the fixed hole 1131. The other end of the fastener 122 has a limiting protrusion 1221. The elastic member 123 is sleeved on the fastener 122. One end of the elastic member 123 abuts against the limiting protrusion 1221 and the other end abuts against the top stamping part 121. The lower end of the top stamping part 121 has a movable surface 125. The fixed surface 112 and the movable surface 125 together form a female surface group.

[0032] Understandably, when the female mold mechanism 1 moves toward the male mold mechanism 2, the female mold surface assembly and the male mold surface 21 move toward each other. Since the male mold surface 21 can support the thermoplastic composite, when the female mold mechanism 1 and the male mold mechanism 2 close, the female mold surface assembly presses the thermoplastic composite against the male mold surface 21, thereby forming the thermoplastic composite into a finished product with a bent structure. During the mold closing process, since the top stamping part 121 is connected to the elastic part 123, and the elastic part 123 is connected to the limiting protrusion 1221 on the fastener 122 installed on the female mold body 11, the movable surface 125 of the top stamping part 121 first contacts the thermoplastic composite during the mold closing process. The top of the composite material contacts the mold, and as the mold closes, the top stamping part 121 presses down on the top of the thermoplastic composite material and slowly compresses the elastic part 123. The elastic part 123 generates a reaction force on the top stamping part 121, so that the top surface of the thermoplastic composite material is always under sufficient force during the mold closing process. Finally, when the fixed surface 112 contacts the thermoplastic composite material, the top and side surfaces of the thermoplastic composite material are simultaneously stressed, so that the overall stress of the thermoplastic composite material is more uniform, overcoming the defect of insufficient top stress, thereby avoiding excessive porosity deviation, delamination and glue richness in the thermoplastic composite material, and improving the molding quality of the thermoplastic composite material.

[0033] In some optional embodiments, the female mold body 11 is provided with a connecting lug 113 at the upper end of the through groove, and the connecting lug 113 is provided with a fixing hole 1131 along the stamping direction. This arrangement can use the connecting lug 113 to limit the top stamping part 121 to a certain extent, thereby improving the structural rationality of the stamping fixture.

[0034] In some optional embodiments, a fixing ear 1211 is provided at the upper end of the top stamping part 121, and the fixing ear 1211 has a movable hole 12111 along the stamping direction. This arrangement facilitates the correspondence between the movable hole 12111 on the fixing ear 1211 and the fixing hole 1131 on the connecting ear 113, thereby improving the structural rationality of the stamping fixture.

[0035] For example, two connecting ears 113 and two fixing ears 1211 are arranged opposite each other. The connecting ears 113 are provided with multiple fixing holes 1131, and the fixing ears 1211 are provided with multiple movable holes 12111. The fixing holes 1131 and movable holes 12111 are arranged in a one-to-one correspondence. Multiple fasteners 122 and elastic elements 123 are also provided, with fasteners 122 installed in each of the corresponding fixing holes 1131 and movable holes 12111, and elastic elements 123 are fitted onto each of the multiple fasteners 122. This arrangement improves the installation stability of the top stamping part 121 and increases the elastic force received by the top stamping part 121, thereby improving the structural strength of the stamping fixture and the molding quality of the thermoplastic composite.

[0036] For example, each connecting ear 113 is provided with two fixing holes 1131 opposite to each other, and each fixing ear 1211 is provided with two moving holes 12111 opposite to each other. This arrangement avoids causing significant structural damage to the female mold body 11 and the top stamping part 121 while ensuring that the top stamping part 121 can be subjected to sufficient elastic force, thereby improving the structural rationality of the stamping fixture.

[0037] Of course, the number of fixed holes 1131 and movable holes 12111 is not limited to this. They can be set as needed according to the actual situation, and no further restrictions are imposed here.

[0038] For example, the top stamping assembly 12 also includes a washer 124 disposed in the movable hole 12111 and connected to the elastic member 123. This arrangement improves the connection stability between the elastic member 123 and the top stamping member 121, thereby improving the reliability of the stamping fixture.

[0039] In some alternative embodiments, the fixed surface 112 includes three connected fixed sub-surfaces, with adjacent fixed sub-surfaces perpendicular to each other. This arrangement enables the thermoplastic composite to be formed into right-angled bent structures, improving the forming versatility of the stamping tooling.

[0040] In some optional embodiments, adjacent fixed sub-faces form a rounded transition. This arrangement ensures uniform stress distribution at the side corners of the thermoplastic composite without dead angles, avoiding stress concentration at the side corners and improving the reliability of the stamping fixture.

[0041] In some optional embodiments, the movable surface 125 includes three connected movable sub-surfaces, adjacent movable sub-surfaces being perpendicular to each other, and the three movable sub-surfaces corresponding one-to-one with the three fixed sub-surfaces. This arrangement allows the movable surface 125 to be adapted to the shape of the fixed surface 112, thereby making the formed shape of the thermoplastic composite uniform and smooth, and improving the forming quality of the stamping tooling.

[0042] In some optional embodiments, adjacent active sub-faces are connected by a rounded transition. This arrangement ensures more uniform stress distribution at the top corners of the thermoplastic composite, eliminating dead zones and preventing stress concentration at the top corners, thus improving the reliability of the stamping fixture.

[0043] In some alternative embodiments, the end of the fastener 122 away from the limiting protrusion 1221 has an external thread section, and the fixing hole 1131 has an internal thread, with the fastener 122 threadedly engaging with the fixing hole 1131. This arrangement improves the reliability of the fastener 122 being fixed in the fixing hole 1131 and facilitates disassembly and assembly, thereby enhancing the reliability and ease of maintenance of the stamping fixture.

[0044] In some optional embodiments, an anti-slip plate 3 is provided on the male mold surface 21, which can abut against the thermoplastic composite. This arrangement can prevent the thermoplastic composite from sliding on the male mold surface 21, thereby ensuring the forming quality of the stamping fixture and improving the structural rationality of the stamping fixture.

[0045] For example, the male mold surface 21 includes three interconnected male sub-molded surfaces, which are perpendicular to each other. This arrangement allows the male sub-molded surfaces to be adapted to the female mold surface assembly, improving the structural rationality of the stamping fixture.

[0046] In some optional embodiments, multiple anti-slip plates 3 are provided, and the multiple anti-slip plates 3 are spaced apart on the male mold surface 21. This arrangement further enhances the friction between the male mold surface 21 and the thermoplastic composite, further prevents the thermoplastic composite from slipping on the male mold surface 21, and improves the reliability of the stamping tooling.

[0047] For example, six anti-slip plates 3 are provided, with two at the connection point of each of two adjacent male mold surfaces. This arrangement targets the positions on the male mold surface 21 most prone to slippage, further preventing the thermoplastic composite material from slipping on the male mold surface 21 and improving the reliability of the stamping tooling.

[0048] For example, the anti-slip plate 3 is a thermoplastic composite material. This design prevents the anti-slip material from contaminating the thermoplastic composite material, resulting in a cleaner thermoplastic composite material after stamping and improving the user experience of the stamping tooling.

[0049] The working process of the stamping fixture in this embodiment is as follows:

[0050] 1. Install the female mold mechanism 1 on the upper surface of the press, and install the male mold mechanism 2 on the lower surface of the press.

[0051] 2. Preheat the female mold mechanism 1 and the male mold mechanism 2, and heat the thermoplastic composite material to a molten state.

[0052] 3. Install the anti-slip plate 3 onto the positive mold surface 21, and the robotic arm transfers the thermoplastic composite material heated to a molten state from the infrared furnace to the positive mold surface 21.

[0053] 4. The female mold mechanism 1 moves from top to bottom, and the female mold mechanism 1 and the male mold mechanism 2 close the mold. The fixed surface 112 and the movable surface 125 exert multi-directional forces on the male mold surface 21, pressing the thermoplastic composite material against the anti-slip sheet 3 and the male mold surface 21.

[0054] 5. After the mold is closed, the press rises, causing the female mold mechanism 1 to move upward and leave the anti-slip plate 3 and the male mold surface 21. The pressure on the male mold mechanism 2 from the female mold mechanism 1 disappears. Then, the molded thermoplastic composite four-sided bending structure test piece is taken out from the male mold surface 21.

[0055] 6. Repeat steps 1-5 to stamp the next thermoplastic composite.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A stamping fixture for a thermoplastic composite bending structure, characterized in that, The device includes a female mold mechanism (1) and a male mold mechanism (2). The female mold mechanism (1) has a stamping groove (111), and the groove wall of the stamping groove (111) has a female surface group. The male mold mechanism (2) has a stamping protrusion, and the surface of the stamping protrusion has a male mold surface (21). The male mold surface (21) can support thermoplastic composite material, and the female surface group can move toward the male mold surface (21) to stamp thermoplastic composite material. The female mold mechanism (1) includes a female mold body (11) and a top stamping assembly (12). The female mold body (11) has a through groove that passes through the stamping groove (111) and has a fixed surface (112). The top stamping assembly (12) includes a top stamping part (121), a fastener (122), and an elastic element (123). The top stamping part (121) is movably disposed in the through groove. The top stamping part (121) has a movable hole (12111), and the female mold body (11) has a fixed hole (1131). The movable hole (12111) corresponds to the fixed hole (1131). One end of the fastener (122) can pass through the movable hole (12111) along the stamping direction and can be fixed to the fixed hole (1131). The other end of the fastener (122) has a limiting protrusion (1221). The elastic element (123) is sleeved on the fastener (122), and one end of the elastic element (123) is connected to the limiting protrusion (1221) and the other end is connected to the top stamping part (121). The lower end of the top stamping part (121) has a movable surface (125). The fixed surface (112) and the movable surface (125) together form the female surface group.

2. The stamping fixture for the thermoplastic composite bending structure according to claim 1, characterized in that, The female mold body (11) is provided with a connecting ear (113) at the upper end of the through groove, and the connecting ear (113) is provided with the fixing hole (1131) along the stamping direction.

3. The stamping fixture for the thermoplastic composite bending structure according to claim 1, characterized in that, The top stamping part (121) is provided with a fixing ear (1211) at its upper end, and the fixing ear (1211) is provided with the movable hole (12111) along the stamping direction.

4. The stamping fixture for the thermoplastic composite bending structure according to claim 1, characterized in that, The fixed surface (112) includes three connected fixed sub-surfaces, and adjacent fixed sub-surfaces are perpendicular to each other.

5. The stamping fixture for the thermoplastic composite bending structure according to claim 4, characterized in that, The adjacent fixed sub-surfaces are connected by a circular arc transition.

6. The stamping fixture for the thermoplastic composite bending structure according to claim 4, characterized in that, The movable surface (125) includes three connected movable sub-surfaces, adjacent movable sub-surfaces are perpendicular to each other, and the three movable sub-surfaces are set in a one-to-one correspondence with the three fixed sub-surfaces.

7. The stamping fixture for the thermoplastic composite bending structure according to claim 6, characterized in that, The adjacent active sub-surfaces are connected by a circular arc transition.

8. The stamping fixture for the thermoplastic composite bending structure according to claim 1, characterized in that, The fastener (122) has an external thread section at one end away from the limiting protrusion (1221), and the fixing hole (1131) has an internal thread. The fastener (122) is threadedly engaged with the fixing hole (1131).

9. The stamping fixture for the thermoplastic composite bending structure according to any one of claims 1-8, characterized in that, An anti-slip sheet (3) is provided on the positive model surface (21), and the anti-slip sheet (3) can abut against the thermoplastic composite material.

10. The stamping fixture for the thermoplastic composite bending structure according to claim 9, characterized in that, Multiple anti-slip plates (3) are provided, and the multiple anti-slip plates (3) are spaced apart on the male model surface (21).

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