Forming die for composite material h-shaped structural member

Abstract

The utility model belongs to the field of composite material manufacturing, and discloses a forming die for a composite material h-shaped structural member, which comprises an upper die and a lower die, and the upper die and the lower die are correspondingly arranged up and down and are detachably connected under the action of pressure; an upper laying layer is attached to the bottom end of the upper die, a lower laying layer is attached to the top end of the lower die, and the upper laying layer and the lower laying layer are correspondingly arranged up and down and fixedly connected in a press fit mode. The side walls of the upper mold and the lower mold are detachably connected with a bottom plate; the bottom plate is attached and fixedly connected with the upper paving layer and the lower paving layer; a positioning assembly used for positioning the upper die and the lower die is arranged between the upper die and the lower die. In the curing stage of the autoclave, the composite die of the upper die can conduct good pressure for a workpiece due to weak rigidity, so that prepreg layers are tighter, the flatness of the assembly surface of the part is further ensured, the qualification rate of the part is improved, and later assembly and use are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite material manufacturing, in particular to a forming die for an H-shaped structural member of a composite material. Background Art

[0002] H-type structural composites are composite materials with an H-shaped cross-sectional shape, usually composed of two or more layers of different materials, which are bonded together by adhesives or other connection methods. They have the advantages of high strength and stiffness, light weight, corrosion resistance, and easy processing and installation. They are widely used in construction, aerospace, automobiles, ships and other industrial fields. Composite H-type structural parts are generally common in the partitions on aircraft. During assembly, the two sides are connected to the parts by gluing / riveting. They are easy to use and widely used.

[0003] Traditional H-shaped structural composite parts are generally manufactured using upper and lower metal molds. Affected by the process and the properties of the material itself, there is a thickness difference between the prepreg before and after curing, resulting in a very obvious step difference in the assembly surface of the H-shaped structural parts manufactured by the full metal mold, which does not meet the flatness requirements.

[0004] Therefore, the present application designs a molding die for an H-shaped structural member of a composite material to solve the above-mentioned technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model proposes a forming die for an H-shaped structural member of a composite material.

[0006] To achieve the above purpose, the utility model provides a forming die for a composite material H-shaped structural member, comprising an upper die and a lower die, wherein the upper die and the lower die are arranged correspondingly up and down and are detachably connected under pressure;

[0007] An upper layer is fitted on the bottom of the upper mold, and a lower layer is fitted on the top of the lower mold. The upper layer and the lower layer are arranged correspondingly up and down and are pressed and fixedly connected.

[0008] The upper mold and the lower mold side walls are detachably connected with a bottom plate, and the bottom plate is bonded and fixed to the upper layer and the lower layer;

[0009] A positioning component for positioning the upper mold and the lower mold is arranged between the upper mold and the lower mold.

[0010] Preferably, the positioning assembly includes correspondingly arranged positioning bosses and positioning holes, the positioning bosses are fixedly connected to the top end of the lower mold, the positioning holes are opened on the upper mold, and the positioning bosses are inserted into the positioning holes when the upper mold is pressed downward.

[0011] Preferably, the upper mold includes a prepreg material laid on the top of the forming mold, and the size of the prepreg material exceeds the size of the upper mold.

[0012] Preferably, the thickness of the prepreg is mm-5 mm.

[0013] Preferably, arc-shaped positions of the side walls of the upper layer and the lower layer are filled with twisted strips, and the twisted strips abut against the side walls of the bottom plate.

[0014] Preferably, a demoulding layer is provided between the upper layer and the upper mold, and a demoulding layer is also provided between the lower layer and the lower mold.

[0015] Preferably, the demoulding layer comprises a demoulding cloth, a non-porous isolation film, an epoxy cover plate, a breathable felt and a vacuum bag which are arranged in sequence; the demoulding cloth is bonded to the upper mold, and the vacuum bag is bonded to the upper layer.

[0016] Compared with the prior art, the utility model has the following advantages and technical effects: the utility model discloses a forming mold for a composite material H-shaped structural part. When in use, the upper layer and the lower layer are laid and attached to the upper mold and the lower mold respectively, and then combined by pressure compression. During the autoclave curing stage, the upper mold composite mold can transmit good pressure to the part due to its weak rigidity, so that the layers of the layer and the lower layer are tighter, thereby ensuring the flatness of the part assembly surface, improving the part qualification rate, and facilitating later assembly and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the molding die of the utility model;

[0019] Figure 2 It is a schematic diagram of the state of the forming mold of the composite material H-shaped structural member before the mold is closed;

[0020] Figure 3 It is a schematic diagram of the mold closing of the forming mold of the composite material H-shaped structural member of the utility model;

[0021] Figure 4 For this utility model Figure 2 A partial enlarged view of middle A;

[0022] Figure 5 This is a schematic diagram of an H-shaped composite material structural member of the utility model;

[0023] In the figure: 1. upper mold; 2. lower mold; 3. upper layer; 4. lower layer; 5. base plate; 6. positioning boss; 7. positioning hole; 8. prepreg; 9. twisted strip; 10. release layer; 11. non-porous isolation film; 12. epoxy cover plate; 13. breathable felt; 14. vacuum bag; 15. molding mold; 16. release cloth. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Reference Figure 1-Figure 5 As shown, this embodiment provides a molding die for a composite material H-shaped structural member, comprising an upper die 1 and a lower die 2, wherein the upper die 1 and the lower die 2 are arranged correspondingly up and down and are detachably connected under pressure;

[0027] The upper layer 3 is fitted on the bottom of the upper mold 1, and the lower layer 4 is fitted on the top of the lower mold 2. The upper layer 3 and the lower layer 4 are arranged correspondingly up and down and pressed and fixedly connected.

[0028] The side walls of the upper mold 1 and the lower mold 2 are detachably connected with a bottom plate 5, and the bottom plate 5 is bonded and fixed to the upper layer 3 and the lower layer 4;

[0029] A positioning assembly for positioning the upper mold 1 and the lower mold 2 is provided between the upper mold 1 and the lower mold 2 .

[0030] The utility model discloses a forming mold for a composite material H-shaped structural part. When in use, an upper layer 3 and a lower layer 4 are laid and attached to an upper mold 1 and a lower mold 2 respectively, and then are pressed and combined by pressure. During the curing stage of an autoclave, the upper mold composite mold can transmit good pressure to the workpiece due to its weak rigidity, so that the upper layer 3 and the lower layer 4 are more closely spaced, thereby ensuring the flatness of the assembly surface of the parts, improving the qualified rate of the parts, and facilitating the later assembly and use.

[0031] Furthermore, the lower mold 2 is a metal thin shell structure, which is conducive to the transfer of temperature during the curing process.

[0032] Further optimizing the scheme, the positioning assembly includes corresponding positioning bosses 6 and positioning holes 7, the positioning bosses 6 are fixedly connected to the top of the lower mold 2, the positioning holes 7 are opened on the upper mold 1, and the positioning bosses 6 are inserted into the positioning holes 7 when the upper mold 1 is pressed down. When the mold is closed, the positioning bosses 6 and the positioning holes 7 are inserted together, so that the upper mold 1 and the lower mold 2 are positioned to ensure the accuracy and stability of the mold closing.

[0033] In a further optimized solution, the upper mold 1 includes a prepreg 8 laid on the top of the molding mold 15, and the size of the prepreg 8 exceeds the size of the upper mold 1; the thickness of the prepreg 8 is 1mm-5mm. Figure 1 , lay the prepreg 8 on the top of the forming mold, heat and pressurize it in an autoclave until it is completely cured, and cut it according to the margin line after curing. At least 10 mm should be reserved at the position of the positioning boss 6 to obtain the upper mold 1.

[0034] Furthermore, the upper mold 1 is a composite laminate structure, which is obtained by laying prepreg on the molding die of the upper mold 1, encapsulating and curing.

[0035] Furthermore, the forming mold 15 is a metal thin shell structure, and the forming surface is the upper surface of the H-shaped workpiece.

[0036] In a further optimized solution, the arc position of the side wall of the upper layer 3 and the lower layer 4 is filled with twisted strips 9, and the twisted strips 9 abut against the side wall of the bottom plate 5. The function of the twisted strips 9 is to fill the arc gap after the upper layer 3 and the lower layer are attached, and compacted through the bottom plate 5, so that the twisted strips 9 are combined with the upper layer 3 and the lower layer 4 to form a complete composite material H-shaped structural member.

[0037] Furthermore, the Tg value after curing should be greater than the curing temperature of the H-type structural part. Generally, the prepreg with the same resin material system as the H-type structural part is used.

[0038] Further optimization scheme, a demoulding layer 10 is arranged between the upper layer 3 and the upper mold 1, and a demoulding layer 10 is also arranged between the lower layer 4 and the lower mold 2; the demoulding layer 10 includes a demoulding cloth 16, a non-porous isolation film 11, an epoxy cover plate 12, a breathable felt 13 and a vacuum bag 14 arranged in sequence; the demoulding cloth 16 is arranged in affixed with the upper mold 1, and the vacuum bag 14 is arranged in affixed with the upper layer 3. The role of the demoulding layer 10 is to facilitate the separation of the upper layer 3 and the lower layer 4 from the upper mold 1 and the lower mold 2, to prevent the inconvenience of separation after molding, and to improve the quality of the workpiece; the demoulding layer 10 is packaged in the packaging order of demoulding cloth 16→non-porous isolation film 11→epoxy cover plate 12→breathable felt 13→vacuum bag 14.

[0039] Construction plan:

[0040] Step 1: If Figure 1As shown, the carbon fiber prepreg 8 is laid on the forming mold 15 of the upper mold 1, and the laying size exceeds the margin line and the positioning boss 6. The number of layers is determined by the thickness, and generally 1-1.5 mm thick is selected. After the first layer is vacuumed during the laying process, vacuum is drawn every three layers to ensure the density of the product. After laying, it is packaged in the order of release cloth 16 → non-porous isolation film 11 → breathable felt 13 → vacuum bag 14, and the temperature is increased and pressurized by an autoclave until it is completely cured. After curing, it is cut according to the margin line, and at least 10 mm needs to be reserved at the position of the positioning boss 6 to obtain the upper mold 1;

[0041] Step 2: If Figure 2 As described above, the carbon fiber prepreg 8 is laid on the lower mold 2 and the upper mold 1 respectively, the laying size exceeds the margin line, the number of layers and the angle are in accordance with the design requirements, and the first layer is vacuumed during the laying process, and every three layers are vacuumed to ensure the density of the product, and then the upper mold 1 and the lower mold 2 are molded together through the positioning boss 6;

[0042] Step 3: If Figure 4 As shown, the twist strips 9 are filled at the R corner of the mold and compacted by vacuum, and the number of layers and angles of the bottom plate 5 are laid according to the design requirements;

[0043] Step 4: packaging in the order of release cloth 16 → non-porous isolation film 11 → epoxy cover plate 12 → air felt 13 → vacuum bag 14 to produce release layer 10;

[0044] Step 5: Place the mold after mold closing into the autoclave and heat and pressurize until it is completely cured;

[0045] Step 6: After curing, the demoulding layer 10 is removed to obtain a roughcast of the composite material H-shaped structural component;

[0046] Step 7: Cut and process according to the product line to obtain the composite material H-shaped structural parts.

[0047] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0048] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A forming die for an H-shaped structural member of a composite material, characterized in that: It comprises an upper die (1) and a lower die (2), wherein the upper die (1) and the lower die (2) are arranged correspondingly up and down and are detachably connected under the action of pressure; An upper layer (3) is fitted on the bottom of the upper mold (1), and a lower layer (4) is fitted on the top of the lower mold (2); the upper layer (3) and the lower layer (4) are arranged correspondingly up and down and are pressed and fixedly connected; The upper mold (1) and the side walls of the lower mold (2) are detachably connected with a bottom plate (5), and the bottom plate (5) is fitted and fixed to the upper layer (3) and the lower layer (4); A positioning component for positioning the upper mold (1) and the lower mold (2) is provided between the upper mold (1) and the lower mold (2).

2. The forming die of the composite material H-shaped structural member according to claim 1, characterized in that: The positioning assembly comprises correspondingly arranged positioning bosses (6) and positioning holes (7); the positioning bosses (6) are fixedly connected to the top end of the lower mold (2); the positioning holes (7) are provided on the upper mold (1); when the upper mold (1) is pressed downward, the positioning bosses (6) are inserted into the positioning holes (7).

3. The forming die of the composite material H-shaped structural member according to claim 1, characterized in that: The upper mold (1) comprises a prepreg (8) laid on the top of the forming mold (15), and the size of the prepreg (8) exceeds the size of the upper mold (1).

4. The forming die for the composite material H-shaped structural member according to claim 3, characterized in that: The thickness of the prepreg (8) is 1 mm to 1.5 mm.

5. The forming die for the composite material H-shaped structural member according to claim 1, characterized in that: The arc-shaped positions of the side walls of the upper layer (3) and the lower layer (4) are filled with twisted strips (9), and the twisted strips (9) are in contact with the side walls of the bottom plate (5).

6. The forming die for the composite material H-shaped structural member according to claim 1, characterized in that: A demoulding layer (10) is provided between the upper layer (3) and the upper mold (1), and a demoulding layer (10) is also provided between the lower layer (4) and the lower mold (2).

7. The forming die for the composite material H-shaped structural member according to claim 6, characterized in that: The demoulding layer (10) comprises a demoulding cloth (16), a non-porous isolation film (11), an epoxy cover plate (12), a breathable felt (13) and a vacuum bag (14) which are arranged in sequence; the demoulding cloth (16) is arranged in contact with the upper mold (1), and the vacuum bag (14) is arranged in contact with the upper layer (3).

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