Forming die and manufacturing method for C-shaped section composite support with negative angle

Abstract

The forming die comprises a core die and a bottom plate, a counter bore used for containing the core die is formed in the middle of the upper end face of the bottom plate, and the portion, on the side of the core die, of the bottom plate is sequentially sleeved with a side pressing plate A, a side pressing plate B and an upper pressing plate from bottom to top, after being assembled, the side pressing plate B and the side pressing plate A press the core mold laying layer, the horizontal part of the core mold laying layer is located between the side pressing plate A and the bottom plate, the vertical part of the core mold laying layer is located between the side pressing plate A and the side pressing plate B and the core mold, and the side pressing plate laying layer is located between the upper pressing plate and the side pressing plate B; after the core mold laying layer and the side pressing plate laying layer are laid, the form of the composite support before forming is formed. The machining cost is low; the molded composite bracket has better corrosion resistance and fatigue resistance, the service life of the product is prolonged, and the maintenance cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material forming, and relates to a forming die for a composite material bracket with a C-shaped cross-section and a negative angle and a manufacturing method. Background Art

[0002] Composite brackets are involved in a variety of industries and applications, including aerospace, automotive, medical devices, construction, etc. Composite materials are usually composed of two or more materials with different properties to obtain better performance than a single material, such as higher strength-to-weight ratio, corrosion resistance and design flexibility.

[0003] Disadvantages of existing technology

[0004] 1. The original metal material uses five-axis CNC machining, and the external surfaces need to be processed at a high cost; 2. Insufficient strength and toughness; 3. Not corrosion-resistant; 4. Insufficient design freedom, which is not conducive to optimizing structural performance. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a composite bracket forming mold with a C-shaped cross-section and a negative angle and a manufacturing method thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A forming die for a composite support with a C-shaped cross-section and a negative angle comprises a core mold and a base plate, wherein a countersunk hole for placing the core mold is arranged in the middle of the upper end surface of the base plate, and a side pressure plate A, a side pressure plate B and an upper pressure plate which cooperate with each other are sequentially sleeved on the base plate on the side of the core mold from bottom to top, and the side pressure plates B and A are assembled to press the core mold ply, the horizontal part of the core mold ply is located between the side pressure plates A and the base plate, the vertical part of the core mold ply is located between the side pressure plates A and B and the core mold, and the side pressure plate ply is located between the upper pressure plate and the side pressure plate B, and after the core mold ply and the side pressure plate ply are laid, the shape before the composite support is formed is formed.

[0008] Furthermore, the side pressure plate A is a rotating body structure, a first step is arranged on the bottom plate of the side of the core mold, and a second step matching the first step is arranged on the side pressure plate A.

[0009] Furthermore, the portion of the side pressure plate A extending to the bottom plate is provided with a horizontally arranged boss along its inner circle, a third step is provided on the lower end surface of the boss along its inner edge, and the gap between the third step and the bottom plate is used to accommodate the horizontal portion of the core mold ply.

[0010] Furthermore, the side pressure plate B is placed on the boss, and the side pressure plate B is a rotating body. The upper end surface of the boss is provided with a fourth step for cooperating with the side pressure plate B. After the side pressure plate B abuts against the fourth step, the inner wall of the side pressure plate B is flush with the inner wall of the boss, and the space between the side pressure plate B, the boss and the core mold is used to accommodate the vertical part of the core mold ply.

[0011] Furthermore, the outer edge of the upper end surface of the core mold is provided with a fifth step for positioning and limiting the upper pressing plate, and the inner wall of the upper pressing plate is provided with a step corresponding to the fifth step.

[0012] Furthermore, the inner wall of the side pressure plate A above the boss is an inclined surface that inclines outward from bottom to top, and the corresponding outer wall of the side pressure plate B is an inclined surface corresponding to the inclined surface of the side pressure plate A.

[0013] Furthermore, the upper end surface of the side pressure plate B is an inclined surface or a horizontal surface. At a position with a negative angle on the composite support, the upper end surface of the side pressure plate B is a corresponding inclined surface. At a position without a negative angle on the composite support, the upper end surface of the side pressure plate B is a horizontal surface.

[0014] A method for manufacturing a composite bracket with a C-shaped cross-section and a negative angle comprises the following steps:

[0015] S1: First, assemble the core mold and the base plate, and lay the core mold layer composite material on the core mold and the base plate;

[0016] S2: Assemble the side pressure plate A and the side pressure plate B, lay the side pressure plate ply on the upper end surface of the side pressure plate B, and then assemble the side pressure plate A and the bottom plate.

[0017] S3: Fold the vertical part of the core mold ply that exceeds the side pressure plate B downward onto the side pressure plate ply;

[0018] S4: Assemble the upper pressing plate and press the upper pressing plate onto the side pressing plate ply;

[0019] S5: Wrap in a vacuum bag, put into an autoclave for curing, and demould in the reverse order of assembly after cooling out of the can to complete the product molding.

[0020] The beneficial effects of the present invention are:

[0021] 1. The metal bracket in the prior art cannot meet the wave transmission performance, is heavy, and has insufficient radar stealth performance;

[0022] 2. The machining cost of composite brackets is relatively low;

[0023] 3. Composite stents have higher specific strength and specific stiffness;

[0024] 4. Composite brackets have better corrosion resistance and fatigue resistance, which prolongs the service life of the product and reduces maintenance costs;

[0025] 5. Composite brackets have a high degree of design freedom, and the layers can be designed according to the direction of force, which is conducive to optimizing structural performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 This is a schematic structural diagram of a composite support with a C-shaped cross-section and a negative angle according to an embodiment of the present invention;

[0028] Figure 2 It is a cross-sectional view of a forming mold of a composite material bracket with a C-shaped cross-section and a negative angle according to an embodiment of the present invention;

[0029] Figure 3 It is a cross-sectional view with a hanging ring of a forming mold of a composite material bracket with a C-shaped cross-section and a negative angle according to an embodiment of the present invention;

[0030] Figure 4 A three-dimensional diagram of a molding die for a composite bracket with a negative angle and a C-shaped cross section according to an embodiment of the present invention;

[0031] Figure 5 It is a schematic diagram of the structure of a C-section ply according to an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] 1. Main body; 11. Upper plate; 12. Middle plate; 13. Lower plate; 14. C-section; 15. Negative angle; 16. Reinforcement rib; 2. Core mold; 21. Lifting ring; 22. First step; 23. Fifth step; 3. Bottom plate; 4. Side pressure plate A; 41. Second step; 42. Boss; 421. Third step; 422. Fourth step; 5. Side pressure plate B; 6. Upper pressure plate; 7. Core mold ply; 8. Side pressure plate ply; 9. Guide block. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", 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; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0038] As shown in the figure, a composite bracket with a C-shaped cross section and a negative angle includes a body 1 with a C-shaped cross section 14, the body 1 includes an upper plate 11, a middle plate 12 and a lower plate 13, one edge of the upper plate 11 is connected to the upper edge of the middle plate 12 as a whole, the lower edge of the middle plate 12 is connected to one edge of the lower plate 13 as a whole, and the upper plate 11, the middle plate 12 and the lower plate 13 form a C-shaped structure. A number of reinforcing ribs 16 are evenly distributed between the upper plate 11, the middle plate 12 and the lower plate 13. The C-shaped opening of the body 1 is facing outward to form an integrated rectangular frame, and the upper plates 11 of the two opposite sides of the rectangular frame are made into a negative angle 15 structure, that is, the upper plate 11 is tilted outward and downward, so that the angle between the upper plate 11 and the middle plate 12 is an acute angle, and the lower plate 13 and the middle plate 12 are at a right angle. The upper plate 11 of the other two opposite frames of the rectangular frame is perpendicular to the middle plate 12, and the lower plate 13 is perpendicular to the middle plate 12.

[0039] A forming die for a composite support with a C-shaped cross-section and a negative angle comprises a core mold 2 and a base plate 3. A countersunk hole for placing the core mold 2 is provided in the middle of the upper end surface of the base plate 3. The core mold 2 is used as an internal support for the composite support. The base plate 3 on the side of the core mold 2 is sequentially sleeved with a side pressure plate A4, a side pressure plate B5 and an upper pressure plate 6 that cooperate with each other from bottom to top. The side pressure plate A4 is a rotating body structure. A first step 22 is provided on the base plate 3 on the side of the core mold 2. A second step 41 that cooperates with the first step 22 is provided on the side pressure plate A4. The part of the side pressure plate A4 extending to the base plate 3 is provided with a horizontally arranged boss 42 along its inner circle. A third step 421 is provided on the lower end surface of the boss 42 along its inner edge. The gap between the third step 421 and the base plate 3 is used to accommodate the horizontal part of the core mold ply 7.

[0040] The side pressure plate B5 is placed on the boss 42. The side pressure plate B5 is a rotating body. The upper end surface of the boss 42 is provided with a fourth step 422 for cooperating with the side pressure plate B5. After the side pressure plate B5 abuts against the fourth step 422, the inner wall of the side pressure plate B5 is flush with the inner wall of the boss 42. The space between the side pressure plate B5, the boss 42 and the core mold 2 is used to accommodate the vertical part of the core mold ply 7.

[0041] The upper pressing plate 6 is located above the side pressing plate B5. The outer edge of the upper end surface of the core mold 2 is provided with a fifth step 23 for positioning and limiting the upper pressing plate 6. The upper pressing plate 6 is also a hollow rotating body. The inner wall of the upper pressing plate 6 is provided with a step corresponding to the fifth step 23. The inner wall of the side pressing plate A4 above the boss 42 is an inclined surface inclined outward from bottom to top, and the corresponding outer wall of the side pressing plate B5 is an inclined surface corresponding to the inclined surface of the side pressing plate A4. The gap between the upper pressing plate 6 and the side pressing plate B5 is used to accommodate the side pressing plate ply 8. As needed, the upper end surface of the side pressing plate B5 is an inclined surface or a horizontal surface. At a position with a negative angle 15 on the composite support, the upper end surface of the side pressing plate B5 is a corresponding inclined surface. At a position without a negative angle 15 on the composite support, the upper end surface of the side pressing plate B5 is a horizontal surface.

[0042] For ease of installation, the side pressure plate A4 is divided into several sections, preferably eight sections, which can be spliced ​​into a side pressure plate A4 in the form of a rotating body. A guide block 9 is fixed to the outer side of the lower end of each section of the side pressure plate A4, and a countersunk hole matching the guide block 9 is opened on the corresponding bottom plate 3. In this way, the guide block 9 is placed in the countersunk hole to complete the positioning of the side pressure plate.

[0043] A lifting ring 21 is fixed to the middle of the core mold 2 for easy lifting.

[0044] The molding method created by the present invention:

[0045] S1: First, assemble the core mold 2 and the bottom plate 3, and lay the core mold ply 7 composite material on the core mold 2 and the bottom plate 3;

[0046] S2: Assemble the side pressure plate A4 and the side pressure plate B5, lay the side pressure plate ply 8 on the upper end surface of the side pressure plate B5, and then assemble the side pressure plate A4 and the bottom plate 3.

[0047] S3: Fold the vertical portion of the core mold ply 7 that exceeds the side pressure plate B5 downward onto the side pressure plate ply 8;

[0048] S4: Assemble the upper pressing plate 6 and press the upper pressing plate 6 onto the side pressing plate ply 8;

[0049] S5: Wrap in a vacuum bag, put into an autoclave for curing, and demould in the reverse order of assembly after cooling out of the can to complete the product molding.

[0050] The present invention solves the following problems existing in the prior art.

[0051] 1. The metal bracket in the prior art cannot meet the wave transmission performance, is heavy, and has insufficient radar stealth performance;

[0052] 2. The machining cost of composite brackets is relatively low;

[0053] 3. Composite stents have higher specific strength and specific stiffness;

[0054] 4. Composite brackets have better corrosion resistance and fatigue resistance, which prolongs the service life of the product and reduces maintenance costs;

[0055] 5. Composite brackets have a high degree of design freedom, and the layers can be designed according to the direction of force, which is conducive to optimizing structural performance.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A forming die for a composite bracket with a C-shaped cross section and negative angle, characterized in that: The invention comprises a core mold (2) and a bottom plate (3), wherein a countersunk hole for placing the core mold (2) is arranged in the middle of the upper end surface of the bottom plate (3), and a side pressure plate A (4), a side pressure plate B (5) and an upper pressure plate (6) which cooperate with each other are sequentially sleeved on the bottom plate (3) on the side of the core mold (2) from bottom to top, and the side pressure plate B (5) and the side pressure plate A (4) are assembled to press the core mold ply (7), and the horizontal part of the core mold ply (7) is located between the side pressure plate A (4) and the bottom plate (3), and the vertical part of the core mold ply (7) is located between the side pressure plate A (4) and the side pressure plate B (5) and the core mold (2), and the side pressure plate ply (8) is located between the upper pressure plate (6) and the side pressure plate B (5), and after the core mold ply (7) and the side pressure plate ply (8) are laid, they form the shape before the composite support is formed.

2. The forming die of the composite bracket with a C-shaped cross-section and negative angle according to claim 1 is characterized in that: The side pressure plate A (4) is a rotating body structure, a first step (22) is arranged on the bottom plate (3) on the side of the core mold (2), and a second step (41) matching with the first step (22) is arranged on the side pressure plate A (4).

3. The forming die of the composite bracket with a C-shaped cross-section and negative angle according to claim 1 is characterized in that: The portion of the side pressure plate A (4) extending onto the bottom plate (3) is provided with a horizontally arranged boss (42) along its inner circle, and a third step (421) is provided on the lower end surface of the boss (42) along its inner edge, and the gap between the third step (421) and the bottom plate (3) is used to accommodate the horizontal portion of the core mold ply (7).

4. The forming die of the composite bracket with a C-shaped cross-section and negative angle according to claim 3 is characterized in that: The side pressure plate B (5) is placed on the boss (42). The side pressure plate B (5) is a rotating body. The upper end surface of the boss (42) is provided with a fourth step (422) for cooperating with the side pressure plate B (5). After the side pressure plate B (5) abuts against the fourth step (422), the inner wall of the side pressure plate B (5) is flush with the inner wall of the boss (42). The space between the side pressure plate B (5), the boss (42) and the core mold (2) is used to accommodate the vertical part of the core mold ply (7).

5. The forming die of the composite bracket with a C-shaped cross-section and negative angle according to claim 1 is characterized in that: The outer edge of the upper end surface of the core mold (2) is provided with a fifth step (23) for positioning and limiting the upper pressing plate (6), and the inner wall of the upper pressing plate (6) is provided with a step corresponding to the fifth step (23).

6. The forming die for the composite bracket with a C-shaped cross-section and negative angle according to claim 5, characterized in that: The inner wall of the side pressure plate A (4) above the boss (42) is an inclined surface that inclines outward from bottom to top, and the outer wall of the corresponding side pressure plate B (5) is an inclined surface corresponding to the inclined surface of the side pressure plate A (4).

7. The forming die for the composite bracket with a C-shaped cross section and negative angle according to claim 1, characterized in that: The upper end surface of the side pressure plate B (5) is an inclined surface or a horizontal surface. At a location on the composite support having a negative angle (15), the upper end surface of the side pressure plate B (5) is a corresponding inclined surface. At a location on the composite support having no negative angle (15), the upper end surface of the side pressure plate B (5) is a horizontal surface.

8. A method for manufacturing a composite bracket with a C-shaped cross section and negative angle according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: First, assemble the core mold (2) and the bottom plate (3), and lay the core mold ply (7) composite material on the core mold (2) and the bottom plate (3); S2: Assemble the side pressure plate A (4) and the side pressure plate B (5), lay the side pressure plate ply (8) on the upper end surface of the side pressure plate B (5), and then assemble the side pressure plate A (4) and the bottom plate (3). S3: Folding the vertical portion of the core mold ply (7) that exceeds the side pressure plate B (5) downward onto the side pressure plate ply (8); S4: Assembling the upper pressing plate (6), and pressing the upper pressing plate (6) onto the side pressing plate layer (8); S5: Wrap in a vacuum bag, put into an autoclave for curing, and demould in the reverse order of assembly after cooling out of the can to complete the product molding.

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