Forming die for arc-shaped composite material covering cap and production process of forming die

Abstract

The forming die comprises a bottom plate, a positioning plate and a top plate, a first concave clamping position is arranged at the position, close to the edge, of the bottom plate, and a first forming face is arranged at the position, close to the center, of the bottom plate; a protruding clamping position is arranged on the bottom face of the positioning plate and connected with the first concave clamping position in a matched mode. The positioning plate is provided with a forming cavity surrounding the first forming surface, and the inner surface of the forming cavity is a second forming surface; the top plate is fixed to the top face of the positioning plate. A third forming face is arranged on the bottom face of the top plate. The first forming face, the second forming face and the third forming face jointly define a forming cavity capable of being covered with a forming material. Due to the adoption of the yin-yang membrane, the appearance quality of the inner and outer surfaces is good, and the inner and outer surfaces do not need to be machined; and the surface carbon fibers cannot be damaged by machining, so that the excellent mechanical property can be guaranteed, the manufacturing period is shortened, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present application relates to a molding die for an arc-shaped composite material mouth cover and a production process thereof, and belongs to the technical field of aerospace equipment. Background Art

[0002] Composite cover (such as Figure 1 Composite materials are often made of two or more materials with different properties combined to achieve better performance than a single material, such as higher strength-to-weight ratio, corrosion resistance, and design flexibility.

[0003] The composite cover in the prior art generally has the following disadvantages:

[0004] 1. The original single-sided mold has one side as the vacuum bag forming surface, and the appearance quality is poor, and the outer surface and outer contour need to be machined;

[0005] 2. Machining will damage carbon fiber and reduce its mechanical properties;

[0006] 3. It needs to be cured in an autoclave, which is very costly.

[0007] Therefore, there is a need for a related technology that can produce a composite material preform using prepreg as a material, and the related technology includes the mold used and the specific production process. Summary of the invention

[0008] In view of the shortcomings of the prior art, the present application provides a molding die for a curved composite material mouth cover, comprising:

[0009] A bottom plate, wherein the bottom plate is provided with a first recessed position near an edge thereof, and a first molding surface is provided near a center thereof;

[0010] A positioning plate, wherein a protruding snap-in position is provided on the bottom surface of the positioning plate near the edge, the protruding snap-in position is adapted and connected with the first recessed snap-in position, and the top surface of the positioning plate protrudes from the top surface of the bottom plate; a molding cavity surrounding the first molding surface is provided near the center of the positioning plate, and the inner surface of the molding cavity is the second molding surface;

[0011] and a top plate, the top plate being fixed to the top surface of the positioning plate, and a third molding surface being provided on the bottom surface of the top plate near the center;

[0012] The first molding surface, the second molding surface and the third molding surface together form a molding cavity capable of being covered with molding material.

[0013] In the above technical solution, further, a second recessed position is provided on the bottom surface of the top plate near the edge, and a portion of the positioning plate protruding from the top surface of the bottom plate is accommodated and fixed in the second recessed position.

[0014] In the above technical solution, further, the main characteristic cross-section of the molding cavity is arc-shaped.

[0015] In the above technical solution, further, a demoulding hole is provided on the top plate, and the bottom end of the demoulding bolt adapted to the demoulding hole acts on the top surface of the positioning plate; the top plate, the positioning plate and the bottom plate are fixedly connected by a plurality of tension bolts.

[0016] In the above technical solution, further, a recessed area is provided on the bottom surface of the bottom plate near the center position.

[0017] In addition, the present application also provides a production process of a curved composite material mouth cover, using the above-mentioned curved composite material mouth cover forming mold, specifically comprising the following steps:

[0018] Step S1, fixing the positioning plate on the top surface of the bottom plate so that the protruding locking position is adapted to be connected with the first recessed locking position;

[0019] Step S2, laying carbon fiber prepreg or carbon fiber fabric in the area surrounded by the first molding surface and the second molding surface;

[0020] Step S3, fixing the top plate on the top surface of the positioning plate, and tightening and fixing the top plate, the positioning plate and the bottom plate;

[0021] Step S4, placing the assembled mold in an oven and maintaining it at a preset temperature for a period of time to complete the curing and molding;

[0022] Step S5, take out of the oven, cool to room temperature, and demould.

[0023] In the above technical solution, further, after step S5, it also includes:

[0024] Step S6, the product after being ejected is transferred to the machining process to process the connecting holes.

[0025] In the above technical scheme, further, the top plate and the bottom plate are tightened and fixed for the first time by using the pull-in bolts, and the entire molding mold is placed in an oven and heated to a preset temperature and maintained for a preset time; the molding mold is taken out, and the top plate and the bottom plate are tightened and fixed for a second time by using the pull-in bolts, and the entire molding mold is placed in the oven again, heated to a preset temperature and maintained for a preset time.

[0026] In the above technical solution, further, in the step S5, the top plate is ejected by using the demoulding bolts adapted to the demoulding holes; and then the positioning plate is taken out to eject the product.

[0027] In the above technical solution, further, in step S4, the temperature of the oven is 130 to 180° C., and the curing time in the oven is 5 to 8 hours.

[0028] The molding die of the arc-shaped composite material mouth cover provided by the present application has good appearance quality of the inner and outer surfaces due to the use of yin and yang membranes, and no machining is required for the inner and outer surfaces; on the one hand, the production process is simplified, the production efficiency is improved, no machining equipment is required, and the production cost is reduced; on the other hand, the surface carbon fiber will not be damaged due to machining, which is conducive to ensuring excellent mechanical properties. Moreover, bolts can be tightened and pressurized, and ovens can be heated and cured to form, which has a lower comprehensive cost than autoclave bag pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objectives and advantages of the present invention will become more apparent from a reading of the detailed description of non-limiting embodiments made with reference to the following accompanying drawings.

[0030] Figure 1 It is a schematic diagram of the structure of the arc-shaped composite material mouth cover;

[0031] Figure 2 A schematic diagram of the three-dimensional structure of a molding die for a curved composite material mouth cover provided in an embodiment of the present application;

[0032] Figure 3 An exploded view of a molding die for a curved composite material mouth cover provided in an embodiment of the present application;

[0033] Figure 4 A cross-sectional view of a molding die for a curved composite material mouth cover provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of a three-dimensional structure of a base plate provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of a three-dimensional structure of a positioning plate provided in an embodiment of the present application;

[0036] Figure 7 A schematic diagram of a three-dimensional structure of a top plate provided in an embodiment of the present application;

[0037] Figure 8 A process flow chart of a production process of a curved composite material mouth cover provided in an embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 100-bottom plate; 200-positioning plate; 300-top plate; 400-tensioning bolt; 500-transportation handle; 600-demolding bolt; 110-peripheral edge; 120-middle recessed area; 130-center protruding portion; 140-weight reduction cavity; 131-first molding surface; 210-molding cavity; 220-protruding position; 211-second molding surface; 310-top plate protruding portion; 311-third molding surface. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0040] The embodiments based on the concepts of the present disclosure may be subjected to various changes and may have various forms, so specific embodiments will be exemplified in the drawings and described in detail in this specification or application. However, this is not to limit the embodiments based on the concepts of the present disclosure to specific disclosed forms, and should be understood to include all changes, equivalents and substitutes included in the ideas and technical scope of the present disclosure.

[0041] The terms "first" and "second" can be used to describe a variety of components, but the components are not limited by the terms. The terms are only used to distinguish one component from other components. For example, within the scope of the rights based on the concept of the present disclosure, the first component can be named as the second component, and similarly, the second component can also be named as the first component.

[0042] When a certain constituent element is said to be "connected" or "connected to" another constituent element, it should be understood that it can be directly connected to or connected to the other constituent element, or other constituent elements may be present in between. On the contrary, when a certain constituent element is said to be "directly connected to" or "directly connected to" another constituent element, it should be understood that no other constituent elements are present in between. Other expressions used to describe the relationship between constituent elements, that is, "between" or "directly between" or "adjacent to" or "directly adjacent to" etc., should also be interpreted in the same way.

[0043] The terms used in this specification are only used to illustrate specific embodiments and are not intended to limit the meaning of the present disclosure. Unless the contrary meaning is clearly stated in the context, the singular expression includes the plural expression. In this specification, the terms "including" or "having" are intended to specify the existence of a preset feature, number, step, action, constituent element, component or combination thereof, and should be understood as not excluding in advance the existence or additional possibility of one or more other features or numbers, steps, actions, constituent elements, components or combinations thereof.

[0044] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as those generally understood by a person of ordinary skill in the art to which the present disclosure belongs. Terms that are the same as those defined in a commonly used dictionary should be interpreted in a manner consistent with the meanings in the context of the relevant art, and should not be interpreted ideally or excessively as formal meanings unless explicitly defined in this specification.

[0045] Figure 1 Schematic diagram of the arc-shaped composite material mouth cover structure.

[0046] like Figure 1 As shown, the main characteristic cross-section of the arc-shaped composite material mouth cover is an arc. Due to shape restrictions, the arc-shaped composite material mouth cover in the prior art is generally formed by comparative autoclave bag pressing, which is a single-sided mold with one side being a vacuum bag molding surface. The appearance quality is poor and the outer surface and outer contour need to be machined.

[0047] In this regard, the molding die of the arc-shaped composite material mouth cover provided in the present application includes a bottom plate, a positioning plate and a top plate. The bottom plate is provided with a first concave clamping position near the edge position, and the bottom plate is provided with a first molding surface near the center position; the bottom surface of the positioning plate is provided with a protruding clamping position near the edge position, and the protruding clamping position is adapted to be connected with the first concave clamping position, and the top surface of the positioning plate protrudes from the top surface of the bottom plate; the positioning plate is provided with a molding cavity surrounding the first molding surface near the center position, and the inner surface of the molding cavity is the second molding surface; the top plate is fixed to the top surface of the positioning plate, and the bottom surface of the top plate is provided with a third molding surface near the center position; the first molding surface, the second molding surface and the third molding surface together enclose a molding cavity that can be covered with carbon fiber prepreg or carbon fiber fabric.

[0048] The molding die of the arc-shaped composite material mouth cover provided by the present application has good appearance quality of the inner and outer surfaces due to the use of yin and yang membranes, and no machining is required for the inner and outer surfaces; on the one hand, the production process is simplified, the production efficiency is improved, no machining equipment is required, and the production cost is reduced; on the other hand, the surface carbon fiber will not be damaged due to machining, which is conducive to ensuring excellent mechanical properties. Moreover, bolts can be tightened and pressurized, and ovens can be heated and cured to form, which has a lower comprehensive cost than autoclave bag pressing.

[0049] Figure 2 A schematic diagram of the three-dimensional structure of a molding die for a curved composite material mouth cover provided in an embodiment of the present application; Figure 3 An exploded view of a molding die for a curved composite material mouth cover provided in an embodiment of the present application; Figure 4 An exploded view of a molding die for a curved composite material mouth cover provided in an embodiment of the present application.

[0050] See also Figure 2 , Figure 3 as well as Figure 4 As shown, a forming mold for an arc-shaped composite material mouth cover provided in an embodiment of the present application includes a bottom plate 100, a positioning plate 200, a top plate 300, a plurality of tightening bolts 400 and at least two transport handles 500.

[0051] The bottom plate 100 is provided with a fixing position of a positioning plate 200; the positioning plate 200 is annular in shape as a whole, and the annular positioning plate 200 is installed on the fixing position of the positioning plate 200; the top plate 300 is fixedly connected to the bottom plate 100 by a plurality of pull-in bolts, and the top plate 300 and the bottom plate 100 clamp and fix the positioning plate 200. The bottom plate 100 is located near the center as a first molding surface 131; the center of the positioning plate 200 is a molding cavity 210 surrounding the first molding surface 131, and the inner surface of the cavity is a second molding surface 211; the bottom surface of the top plate 300 is provided with a third molding surface 311 near the center; the first molding surface 131, the second molding surface 211 and the third molding surface 311 together form a molding cavity capable of laying molding materials.

[0052] In this embodiment, the molding material is carbon fiber prepreg or carbon fiber fabric.

[0053] The two transfer handles 500 are fixed to the bottom plate 100 by fastening bolts and are symmetrically distributed. The transfer handles 500 are convenient for placing the mold into or taking it out of the oven, or for transporting and storing the mold.

[0054] The structures of the main components are as follows Figure 5-7 As shown, further explanation is given in conjunction with the accompanying drawings.

[0055] Figure 5 A schematic diagram of the three-dimensional structure of a base plate provided in an embodiment of the present application.

[0056] like Figure 5 As shown, the top surface of the bottom plate 100 is provided with three layers, namely: the peripheral edge portion 110, the middle recessed area 120 and the central protruding portion 130. In this embodiment, the height of the central protruding portion 130 is higher than the peripheral edge portion 110. The middle recessed area 120 is the first recessed position for fixing the positioning plate 200; the top surface of the central protruding portion 130 is the first molding surface 131.

[0057] The longitudinal section of the bottom plate 100 is arc-shaped, and the edge of the bottom plate 100 is undulating, with some portions being convex and some portions being concave.

[0058] See also Figure 3 and Figure 4 In some implementations, a weight-reducing cavity 140 is provided at the bottom center of the bottom plate 100, which saves materials on the one hand and reduces weight on the other hand, facilitating mold transportation.

[0059] Figure 6 A schematic diagram of the three-dimensional structure of a positioning plate provided in an embodiment of the present application.

[0060] like Figure 6As shown, the positioning plate 200 is annular as a whole, that is, a molding cavity 210 is provided near the center of the positioning plate 200, and a protruding position 220 is provided near the edge of the bottom surface of the positioning plate 200.

[0061] The positioning plate 200 is installed to the top surface of the base plate 100, and the protruding position 220 is adapted to be connected with the first recessed position; the top surface of the positioning plate 200 protrudes from the top surface of the base plate 100, and the molding cavity 210 is sleeved on the central protrusion 130 of the base plate 100, and the height of the central protrusion 130 is less than the depth of the molding cavity 210, and the inner surface of the molding cavity 210 is the second molding surface 211.

[0062] Figure 7 A schematic diagram of the three-dimensional structure of the top plate provided in an embodiment of the present application.

[0063] like Figure 7 As shown, a top plate protrusion 310 is provided near the center of the bottom surface of the top plate 300, and the top plate 300 is fixedly connected to the positioning plate 200 and the bottom plate 100 by tightening bolts 400. The top plate 300 is fixed on the top surface of the positioning plate 200, and its top plate protrusion 310 is installed on the upper part of the molding cavity 210. The surface of the top plate protrusion 310 is the third molding surface 311, and the first molding surface 131, the second molding surface 211 and the third molding surface 311 together form a molding cavity that can be paved with molding materials.

[0064] The longitudinal section of the top plate 300 is arc-shaped, and the edge of the bottom plate 100 is undulating, with some portions being convex and some portions being concave. The convex portion of the top plate 300 is connected to the concave portion of the bottom plate 100, and the concave portion of the top plate 300 is connected to the convex portion of the bottom plate 100.

[0065] In some embodiments, the bottom surface of the top plate 300 is provided with a second recessed position near the edge, the portion of the positioning plate 200 protruding from the top surface of the bottom plate 100 is accommodated and fixed in the second recessed position, the bottom surface of the positioning plate 200 is fixed by the first recessed position of the bottom plate 100, and the top surface of the positioning plate 200 is fixed by the second recessed position of the top plate 300. Of course, these are only some specific embodiments of the present application, and the second recessed position may not be provided. Only by using the mutual cooperation of the protruding state and the recessed state of the bottom plate 100 and the top plate 300, precise limiting is achieved.

[0066] See also Figure 4 and Figure 7 A demoulding hole is provided on the top plate 300. During demoulding, the demoulding bolt 600 adapted to the demoulding hole acts on the bottom plate 100 or the positioning plate 200 at its end, thereby reversely ejecting the top plate 300.

[0067] Figure 8 A process flow chart of a production process of a curved composite material mouth cover provided in an embodiment of the present application.

[0068] like Figure 8 As shown, the present application also provides a production process of a curved composite material mouth cover, which uses the above-mentioned forming mold, and the production process includes the following steps:

[0069] Step S1, fix the positioning plate 200 on the top surface of the bottom plate 100 so that the protruding locking position 220 is adapted to be connected with the first recessed locking position;

[0070] Step S2, covering the molding material in the area enclosed by the first molding surface 131 and the second molding surface 211;

[0071] In this embodiment, the molding material is carbon fiber prepreg or carbon fiber fabric;

[0072] Step S3, fixing the top plate 300 on the top surface of the positioning plate 200, and tightening and fixing the top plate 300, the positioning plate 200 and the bottom plate 100;

[0073] Step S4, placing the assembled mold in an oven and maintaining it at a preset temperature for a period of time to complete the curing and molding.

[0074] In this embodiment, the preset temperature of the oven is 130-180° C., and the curing time in the oven is 5-8 hours.

[0075] Step S5, take out of the oven, cool to room temperature, and demould.

[0076] In this embodiment, the demoulding process specifically includes: using demoulding bolts 600 adapted to the demoulding holes to push out the top plate 300; and then taking out the positioning plate 200 to eject the product.

[0077] In some embodiments, after step S5, the method further includes:

[0078] Step S6, the product after being ejected is transferred to the machining process to process the connecting holes.

[0079] For the connection holes, machining is convenient and efficient, and will not damage the surface or affect the mechanical properties. Of course, the connection holes can also be formed in one go by setting a core mold, avoiding machining.

[0080] In this embodiment, the tensioning of the bottom plate 100, the positioning plate 200 and the top plate 300 is performed twice:

[0081] The top plate 300 and the bottom plate 100 are tightened and fixed by the pull-in bolts for the first time, and the entire molding mold is placed in an oven and heated to a preset temperature and maintained for a preset time; the molding mold is taken out, and the top plate 300 and the bottom plate 100 are tightened and fixed by the pull-in bolts for a second time, and the entire molding mold is placed in the oven again, heated to a preset temperature and maintained for a preset time.

[0082] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole and the technical solutions in each embodiment.

Claims

1. A molding die for an arc-shaped composite material mouth cover, characterized in that: include: A bottom plate, wherein the bottom plate is provided with a first recessed position near an edge thereof, and a first molding surface is provided near a center thereof; A positioning plate, wherein a protruding snap-in position is provided on the bottom surface of the positioning plate near the edge, the protruding snap-in position is adapted and connected with the first recessed snap-in position, and the top surface of the positioning plate protrudes from the top surface of the bottom plate; a molding cavity surrounding the first molding surface is provided near the center of the positioning plate, and the inner surface of the molding cavity is the second molding surface; and a top plate, the top plate being fixed to the top surface of the positioning plate, and a third molding surface being provided on the bottom surface of the top plate near the center; The first molding surface, the second molding surface and the third molding surface together form a molding cavity capable of being covered with molding material.

2. The molding die for the arc-shaped composite material mouth cover according to claim 1, characterized in that: A second recessed position is provided on the bottom surface of the top plate near the edge, and a portion of the positioning plate protruding from the top surface of the bottom plate is accommodated and fixed in the second recessed position.

3. The molding die for the arc-shaped composite material mouth cover according to claim 1, characterized in that: The main characteristic cross section of the molding cavity is an arc shape.

4. The molding die for the arc-shaped composite material mouth cover according to claim 1, characterized in that: The top plate is provided with a demoulding hole, and the bottom end of the demoulding bolt adapted to the demoulding hole acts on the top surface of the positioning plate; the top plate, the positioning plate and the bottom plate are fixedly connected by a plurality of tension bolts.

5. The molding die for the arc-shaped composite material mouth cover according to claim 1, characterized in that: A recessed area is provided near the center of the bottom surface of the bottom plate.

6. A production process for an arc-shaped composite material mouth cover, characterized in that: The forming mold of the curved composite material mouth cover according to any one of claims 1 to 5 is used, and specifically comprises the following steps: Step S1, fixing the positioning plate on the top surface of the bottom plate so that the protruding locking position is adapted to be connected with the first recessed locking position; Step S2, covering the area enclosed by the first molding surface and the second molding surface with molding material; Step S3, fixing the top plate on the top surface of the positioning plate, and tightening and fixing the top plate, the positioning plate and the bottom plate; Step S4, placing the assembled mold in an oven and maintaining it at a preset temperature for a period of time to complete the curing and molding; Step S5, take out of the oven, cool to room temperature, and demould.

7. The production process of a curved composite material mouth cover according to claim 6, characterized in that: After step S5, the method further includes: Step S6, the product after being ejected is transferred to the machining process to process the connecting holes.

8. The production process of a curved composite material mouth cover according to claim 6, characterized in that: The top plate and the bottom plate are tightened and fixed by the pull-in bolts for the first time, and the entire molding mold is placed in an oven and heated to a preset temperature and maintained for a preset time; the molding mold is taken out, and the top plate and the bottom plate are tightened and fixed by the pull-in bolts for a second time, and the entire molding mold is placed in the oven again, heated to a preset temperature and maintained for a preset time.

9. The production process of a curved composite material mouth cover according to claim 6, characterized in that: In step S5, the top plate is ejected by using the ejection bolts matched with the ejection holes; then the positioning plate is taken out to eject the product.

10. The production process of a curved composite material mouth cover according to claim 6, characterized in that: In step S4, the temperature of the oven is 130-180° C., and the curing time in the oven is 5-8 hours.

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