Composite material preform forming mold and forming method

Abstract

The invention provides a composite material prefabricated body forming mold and a forming method, and belongs to the field of mold design and manufacturing and composite material manufacturing. The problems that the wall thickness of a product is not uniform, operation is tedious and time is consumed in the production process of a composite material prefabricated body product are solved. The mold removing device comprises side plates, an upper flange, a bottom plate and a mold removing block, the bottom plate is in a groove shape, the upper flange covers the bottom plate, the side plates are arranged at the left end and the right end in the bottom plate, and the mold removing block is arranged at the bottom of the bottom plate. The extrusion force on the four surfaces around the prefabricated body is consistent and uniform in the mold closing process of the prefabricated body. After the prefabricated body is laid, the laid prefabricated body is placed in the prefabricated body forming mold, the upper flange is fastened by the bolts to pressurize the prefabricated body, and under the action of the upper flange, the periphery of the prefabricated body is subjected to uniform counter-acting force of the bottom plate mold, so that the problem that the prefabricated body is damaged due to the fact that the periphery is pressurized in the forming process is solved. And the wall thickness of the composite material around the prefabricated body is not uniform due to non-uniform bolt fastening force.

Description

Technical Field

[0001] The invention belongs to the field of mold design and manufacturing and composite material manufacturing, and in particular relates to a composite material preform molding mold and a molding method. Background Art

[0002] Composite materials are widely used in aviation, aerospace, weapons and equipment and other fields. The structures are becoming more and more lightweight. Composite preforms are also a key step in the production of composite products. However, the production of preform products currently has problems such as time-consuming and uneven wall thickness of the products after production.

[0003] Conventional composite material preform molding dies are fastened to each other by four-sided dies, which cannot ensure uniform wall thickness of the preform and is relatively complicated to operate. Summary of the invention

[0004] In view of this, in order to solve the problems of uneven product wall thickness, complicated operation and time-consuming production in the production of composite material preform products, the present invention provides a composite material preform forming mold and a forming method.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a composite material preform forming mold and forming method, including side plates, an upper flange, a bottom plate and a stripping module, the bottom plate is in a groove shape, with an upper flange covered on the top, side plates are arranged at the left and right ends of the bottom plate, and a stripping module is arranged at the bottom.

[0006] Furthermore, the side plate is a quadrangular pyramid structure, and a positioning hole, a fastening hole, a demoulding surface and a positioning surface are arranged on the quadrangular pyramid.

[0007] Furthermore, the upper flange is in the form of a boss structure, and is provided with positioning holes and fastening holes for positioning with the bottom plate.

[0008] Furthermore, the bottom plate is provided with connection holes and positioning holes connected to the side plates, connection holes, positioning holes and fixing holes connected to the stripping modules, and positioning holes and connection holes connected to the upper flange.

[0009] Furthermore, the bottom plate uses positioning surfaces and positioning pins to position the side plates, and after positioning, bolts are used to fix the side plates to the bottom plate.

[0010] Furthermore, the bottom plate uses a positioning surface and positioning pins to fix the upper flange and the bottom plate.

[0011] Furthermore, the stripping module is designed with connecting holes and positioning holes connected to the bottom plate, and the connecting holes and positioning holes here are blind holes.

[0012] Furthermore, the bottom plate uses a positioning surface and a positioning pin to position the stripping module, and after positioning, bolts are used to fix the stripping module to the bottom plate.

[0013] Furthermore, the convex surface of the upper flange, the upper surface of the stripping module, and the side surface of the side plate form a cavity of the preform.

[0014] A molding method using a composite material preform molding mold specifically comprises the following steps:

[0015] Step 1: Position the stripping module and the bottom plate through the two positioning holes on the bottom of the stripping module. The stripping module and the inner cavity of the bottom plate have positioning surfaces that match. The stripping module and the bottom plate are fastened together with fastening bolts.

[0016] Step 2: The two side panels and the bottom panel are positioned through the positioning holes, the inclined surfaces of the demoulding surfaces are matched, and the side panels and the bottom panel are fastened with two fastening bolts;

[0017] Step 3: Place the formed composite material preform into the cavity formed by the side plate, bottom plate and stripping module, position the upper flange with two positioning pins, tighten the bolts, and use diagonal uniform force during the tightening process to ensure that the upper flange is stable and in place with the bottom plate. After the mold is in place, put it into the furnace for curing;

[0018] Step 4: Demold the cured composite preform. Before demolding, ensure that the temperature of the mold is room temperature to ensure that the preform does not deform during demolding. Take out the positioning pins and fastening bolts connecting the upper flange and the bottom plate in turn, separate them, use the fixing bolts to separate the upper flange from the bottom plate, install the fixing bolts under the bottom plate to push out the demolding module, and remove the preform product and the side panels together. Then take out the preform product.

[0019] Compared with the prior art, the composite material preform forming mold and forming method described in the present invention have the following beneficial effects:

[0020] 1. The present invention includes a mold design that uses upper flange positioning and bolt tightening to save effort, save time and is easy to operate.

[0021] 2. Preset demoulding module, which is located under the prefabricated product. After the product is cured, the demoulding module is ejected and the product is taken out by the demoulding tool, which can completely avoid damage to the product during the demoulding process.

[0022] 3. The present invention ensures that the extrusion pressure on the four sides of the preform is consistent and uniform during the preform mold closing process. After the preform is laid, the preform is placed in the preform forming mold, and the upper flange is tightened with bolts to pressurize the preform. Under the action of the upper flange, the four sides of the preform are subjected to a uniform reaction force from the bottom plate mold, which solves the problem of uneven wall thickness of the composite material around the preform due to uneven bolt tightening force during the pressurization of the four sides during the forming process of the preform. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 It is a partial cross-sectional view of the composite material preform forming mold of the present invention;

[0025] Figure 2 A three-dimensional diagram of a composite material preform forming mold according to the present invention;

[0026] Figure 3 It is a structural schematic diagram of the side plate of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the bottom plate of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the flange of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the stripping module of the present invention;

[0030] In the figure: 1-side plate, 2-upper flange, 3-bottom plate, 4-removal module. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0032] See also Figure 1-6 To describe this embodiment, a composite material preform forming mold, 1. includes a side plate 1, an upper flange 2, a bottom plate 3 and a stripping module 4, wherein the bottom plate 3 is in a groove shape and is covered with the upper flange 2, side plates 1 are arranged at the left and right ends of the bottom plate 3, and a stripping module 4 is arranged at the bottom.

[0033] The side plate 1 is a tetrahedral pyramid structure, and is provided with positioning holes, fastening holes, a demoulding surface (three inclined vertical surfaces of the tetrahedral pyramid), and a positioning surface (a surface of the tetrahedral pyramid perpendicular to the upper and lower surfaces).

[0034] The upper flange 2 is a boss structure, and is provided with positioning holes and fastening holes for mutual positioning with the bottom plate 3. The boss structure has four vertical surfaces, the vertical surfaces of the long sides are in contact with the bottom plate, and the vertical surfaces of the short sides are in contact with the side plate 1, and the upper flange 2 can be positioned through the contact surfaces with the bottom plate and the side plate.

[0035] The bottom plate 3 is a concave structure, and is provided with connection holes and positioning holes connected to the side plate 1, connection holes, positioning holes and fixing holes connected to the demolding mold 4, and positioning holes and connection holes for the upper flange 2.

[0036] The stripping module 4 is designed with a connecting hole and a positioning hole connected to the bottom plate 3, and the connecting hole and the positioning hole are blind holes.

[0037] The bottom plate 3 uses a positioning surface and a positioning pin to position the stripping module 4, and after positioning, the stripping module 4 and the bottom plate 3 are fixed with bolts.

[0038] The bottom plate 3 uses a positioning surface and a positioning pin to position the side plate 1, and after positioning, the side plate 1 and the bottom plate 3 are fixed by bolts.

[0039] The bottom plate 3 uses a positioning surface and a positioning pin to fix the upper flange 2 and the bottom plate 3.

[0040] The convex surface of the upper flange 2, the upper surface of the stripping module 4, and the side surface of the side plate 1 form a cavity of the preform.

[0041] A molding method using a composite material preform molding mold specifically comprises the following steps:

[0042] Step 1: Position the stripping module 4 and the bottom plate 3 through the two positioning holes on the bottom of the stripping module 4. The stripping module 4 and the inner cavity of the bottom plate 3 have positioning surfaces that match. The stripping module 4 and the bottom plate 3 are fastened together with fastening bolts.

[0043] Step 2: The two side panels 1 and the bottom panel 3 are positioned through the positioning holes, the inclined surfaces of the demoulding surfaces are matched, and the side panels 1 and the bottom panel 3 are fastened with two fastening bolts;

[0044] Step 3: After the composite material preform is laid, it is placed in the cavity formed by the side plate 1, the bottom plate 3, and the stripping module 4. The upper flange 2 is positioned with two positioning pins and tightened with bolts. During the tightening process, diagonal force is applied evenly to ensure that the upper flange 2 is stably molded with the bottom plate 3. After the mold is in place, it is put into the furnace for curing;

[0045] Step 4: demoulding the cured composite material preform. Before demoulding, ensure that the temperature of the mold is close to room temperature, ensure that the preform does not deform during demoulding, remove the positioning pins and fastening bolts connecting the upper flange 2 and the bottom plate 3 in sequence, and use the fixing bolts to separate the upper flange 2 from the bottom plate 3. Install the fixing bolts under the bottom plate 3 to push out the demolding module 4, and the demolding module 4 will fix the preform product and the side plate 1 together. The preform product is taken out without damage, and the operation is convenient and quick.

[0046] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A composite material preform forming mold, characterized in that: The device comprises a side plate (1), an upper flange (2), a bottom plate (3) and a stripping module (4); the bottom plate (3) is in a groove shape and is covered with an upper flange (2); side plates (1) are arranged at the left and right ends of the bottom plate (3); and a stripping module (4) is arranged at the bottom.

2. The composite material preform forming mold according to claim 1, characterized in that: The side plate (1) is a quadrangular pyramid structure, and a positioning hole, a fastening hole, a demoulding surface, and a positioning surface are arranged on the quadrangular pyramid.

3. The composite material preform forming mold according to claim 1, characterized in that: The upper flange (2) is in the form of a boss structure, and is provided with positioning holes and fastening holes for positioning with the bottom plate (3).

4. The composite material preform forming mold according to claim 1, characterized in that: The bottom plate (3) is provided with connection holes and positioning holes connected to the side plate (1), connection holes, positioning holes and fixing holes connected to the stripping module (4), and positioning holes and connection holes connected to the upper flange (2).

5. The composite material preform forming mold according to claim 1, characterized in that: The bottom plate (3) uses a positioning surface and positioning pins to position the side plate (1), and after positioning, bolts are used to fix the side plate (1) and the bottom plate (3).

6. The composite material preform forming mold according to claim 1, characterized in that: The bottom plate (3) uses a positioning surface and positioning pins to fix the upper flange (2) and the bottom plate (3).

7. The composite material preform forming mold according to claim 1, characterized in that: The stripping module (4) is designed with a connection hole and a positioning hole connected to the bottom plate (3), and the connection hole and the positioning hole here are blind holes.

8. The composite material preform forming mold according to claim 7, characterized in that: The bottom plate (3) uses a positioning surface and a positioning pin to position the stripping module (4), and after positioning, bolts are used to fix the stripping module (4) and the bottom plate (3).

9. The composite material preform forming mold according to claim 1, characterized in that: The convex surface of the upper flange (2), the upper surface of the stripping module (4), and the side surface of the side plate (1) form a mold cavity of the preform.

10. A molding method using the composite material preform molding mold according to any one of claims 1 to 9, characterized in that: The specific steps include: Step 1: The stripping module (4) and the bottom plate (3) are positioned through two positioning holes on the bottom of the stripping module (4) and the bottom plate (3). The stripping module (4) and the bottom plate (3) are matched with each other by positioning surfaces on the periphery thereof. The stripping module (4) and the bottom plate (3) are matched and fastened together by fastening bolts to form a whole. Step 2: The two side panels (1) and the bottom panel (3) are positioned through the positioning holes, the inclined surfaces of the demoulding surfaces are matched, and the side panels (1) and the bottom panel (3) are matched and fastened with two fastening bolts; Step 3: After the composite material preform is laid, it is placed in the cavity formed by the side plate (1), the bottom plate (3) and the stripping module (4), the upper flange (2) is positioned using two positioning pins, and the bolts are tightened. During the tightening process, diagonal force is applied evenly to ensure that the upper flange (2) is stably molded into place with the bottom plate (3), and after the mold is in place, it is put into the furnace for curing; Step 4: demoulding the cured composite material preform. Before demoulding, the temperature of the mold is ensured to be room temperature to ensure that the preform does not deform during demoulding. The positioning pins and fastening bolts connecting the upper flange (2) and the bottom plate (3) are removed and separated in sequence. The upper flange (2) and the bottom plate (3) are separated by fixing bolts. The fixing bolts are installed under the bottom plate (3) to push out the demolding module (4). The demolding module (4) fixes the preform product and the side plate (1) together, and the preform product is taken out.

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