A forming die and demolding method for a variable cross-section closed-angle hat-shaped pipeline composite part

Abstract

The present invention discloses a forming die and a demolding method for a variable cross-section closed-angle hat-shaped pipeline composite part. The forming die includes an outer die and a core die. The outer die includes an upper die body and a lower die body. The lower die body is divided into a main die body and a split module. The split module is detachably embedded in the upper edge opening of the main die body and contacts the variable cross-section closed-angle hat-shaped pipeline composite part, and is used to jack up and demold the formed variable cross-section closed-angle hat-shaped pipeline composite part. By separately designing the main die body and the split module, the present invention solves the problem of difficult demolding of the variable cross-section closed-angle hat-shaped pipeline composite part, ensures the product quality during the demolding process, and this design concept can more widely solve the demolding problems of more closed-angle parts, having extremely high application and popularization value.

Description

Technical Field

[0001] The present invention relates to a forming die and a demoulding method for a variable cross-section closed-angle hat-shaped pipeline composite part. Background Art

[0002] Composite materials have the advantages of high specific strength and specific stiffness, corrosion resistance, good fatigue resistance, and good designability, which have continuously expanded their applications. Especially in the past 30 years, the research and development and applications of composite materials in the aerospace field have witnessed a blowout development. Compared with foreign countries, the application of composite materials in the civil aircraft field in China started relatively late. In recent years, with the maturity of composite material products and the continuous advancement of manufacturing technologies, the design and manufacturing levels of aviation composite parts in China have made great progress.

[0003] Aviation composite parts generally adopt the autoclave forming process. The die is the main process equipment for preparing such parts, which is used to ensure the shape, structure, and quality of the parts. Therefore, the design and manufacturing of composite material dies directly affect the quality of composite parts.

[0004] Variable cross-section closed-angle hat-shaped pipeline composite parts are generally thin-walled pipeline parts with complex structures. Their dies include an external mold and a core mold for forming the pipeline cavity to cure and form the parts. Usually, the external mold includes an upper mold body and a lower mold body. The composite material for making variable cross-section closed-angle hat-shaped pipeline parts is laid on the core mold, then placed in the lower mold body and combined with the upper mold body, and then sent into the autoclave for forming. However, since there are closed-angle areas at both ends of the variable cross-section closed-angle hat-shaped pipeline composite part and their demoulding directions are opposite, the existing forming die cannot be adjusted to a suitable angle after the part is formed, making it difficult for the part to be demoulded smoothly. And due to the hot pressing effect of the autoclave, the core mold and the external mold are tightly fitted together, clamping the hat-shaped pipeline composite part in the middle. Adopting a hard demoulding method is likely to cause the part to be damaged or even injured, resulting in unqualified parts produced or potential problems in the later use of the parts. Therefore, there is an urgent need for a reasonable and effective method to solve this problem. Summary of the Invention

[0005] Aiming at the above existing problems, the present invention provides a forming die and a demoulding method for a variable cross-section closed-angle hat-shaped pipeline composite part. By splitting the die body for forming the variable cross-section closed-angle hat-shaped pipeline composite part into a main die body and a split module, the demoulding of the part is completed by the cooperation of the main die body and the split module. After the part is thermally cured, the connecting bolts and cylindrical pins between the main die body and the split module are removed, and the split module is jacked up by the jackscrews to drive the part to separate from the main die body together, completing the demoulding. This die-splitting method solves the problem of difficult demoulding of variable cross-section closed-angle hat-shaped pipeline composite parts and ensures the product quality during the demoulding process. The specific technical method is as follows:

[0006] First, the present invention provides a forming die for a variable cross-section closed-angle cap-shaped pipeline composite part, which includes an outer die and a core die. The outer die includes an upper die body and a lower die body. The lower die body is divided into a main die body and a split module. The split module is detachably embedded in the upper edge opening of the main die body and contacts the variable cross-section closed-angle cap-shaped pipeline composite part, and is used to jack up and demold the formed variable cross-section closed-angle cap-shaped pipeline composite part.

[0007] For the aforementioned forming die for a variable cross-section closed-angle cap-shaped pipeline composite part, the split module is arranged at one end on one side of the main die body and is located at the closed-angle area at the end of the variable cross-section closed-angle cap-shaped pipeline composite part; and the split module is arranged on the inner surface of the main die body, and its lower part extends to the cap top area of the variable cross-section closed-angle cap-shaped pipeline composite part.

[0008] Preferably, for the aforementioned forming die for a variable cross-section closed-angle cap-shaped pipeline composite part, the split module is a module with a Z-shaped cross-section, which includes a fixing part, a connecting part and a toggle part; the fixing part is located in the brim area of the variable cross-section closed-angle cap-shaped pipeline composite part and is used for connecting and fixing with the main die body; the toggle part is located in the cap top area of the variable cross-section closed-angle cap-shaped pipeline composite part and is used to lift up the variable cross-section closed-angle cap-shaped pipeline composite part during demolding; the connecting part connects the fixing part and the toggle part.

[0009] Further preferably, the fixing part is provided with bolt holes, positioning pin holes and setscrew holes; the bolt holes and positioning pin holes are used for positioning and assembling the split module on the main die body; the setscrew holes are used for the setscrew to jack up and demold the formed variable cross-section closed-angle cap-shaped pipeline composite part.

[0010] Preferably, for the aforementioned forming die for a variable cross-section closed-angle cap-shaped pipeline composite part, the thickness of the split module is 10 - 15 mm; its width is one-fourth to one-half of the longitudinal length of the variable cross-section closed-angle cap-shaped pipeline composite part.

[0011] Preferably, for the aforementioned forming die for a variable cross-section closed-angle cap-shaped pipeline composite part, the length of the fixing part of the split module is greater than half of the brim width of the variable cross-section closed-angle cap-shaped pipeline composite part, reserving positions for bolts and pins; the length of the connecting part of the split module is limited by the height of the variable cross-section closed-angle cap-shaped pipeline composite part; the length of the toggle part of the split module is half of the cap top width of the variable cross-section closed-angle cap-shaped pipeline composite part, ensuring that the part can be successfully lifted without damage and with the least effort.

[0012] The aforementioned variable cross-section closed-angle hat-shaped pipe composite part forming die, on the main die body, there are module slots for the split modules to be inserted. The depth of the module slots is equivalent to the thickness of the split modules, and corresponding bolt holes, positioning pin holes and setscrew holes are provided at the upper edges of the module slots. It is positioned and connected with the split modules through cylindrical pins and bolts.

[0013] Secondly, the present invention also provides a method for forming and demolding a variable cross-section closed-angle hat-shaped pipe composite part, using the aforementioned forming die for forming and demolding the variable cross-section closed-angle hat-shaped pipe composite part, which specifically includes the following steps:

[0014] S1: Die assembly: First, through cylindrical pins and connecting bolts, the split modules are inserted into the module slots on the main die body and positioned and fixed using bolt holes and positioning pin holes to form a complete lower die body, ensuring that the step difference and gap between the split modules and the main die body are as small as possible;

[0015] S2: Laying and curing: The composite prepreg for preparing the variable cross-section closed-angle hat-shaped pipe is laid on the core mold and the lower die body assembled in step S1 according to requirements, and then the mold is closed and sealed. The device with the laid material is sent into the autoclave to complete the curing process of the part according to the specified parameters;

[0016] S3: Part demolding: Remove the cylindrical pins and connecting bolts between the main die body and the split modules, install the ejector screws, lift the split modules through the ejector screws, and the split modules drive the formed part to smoothly demold from the lower die body. Then remove the core mold to obtain the formed variable cross-section closed-angle hat-shaped pipe composite part.

[0017] Advantages of the present invention:

[0018] By separately designing the main die body and the split modules, the present invention solves the problem of difficult demolding of variable cross-section closed-angle hat-shaped pipe composite parts.

[0019] Through the smooth demolding of the variable cross-section closed-angle hat-shaped pipe composite part, the present invention ensures the product quality during the demolding process; moreover, the design of the die is simple and the operation is also very simple, but the effect is remarkable.

[0020] With the design concept of the variable cross-section closed-angle hat-shaped pipe composite part device, the present invention can more widely solve the demolding problems of more closed-angle parts, and has extremely high application and promotion value. Brief description of the drawings

[0021] Figure 1 It is a schematic structural diagram of the variable cross-section closed-angle hat-shaped pipe composite part of the present invention;

[0022] Figure 2 It is a schematic end structure diagram of the variable cross-section closed-angle hat-shaped pipe composite part of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a forming die for a composite material part of a variable-section closed-angle cap-shaped pipeline according to the present invention;

[0024] Figure 4 This is a schematic diagram of the main mold structure of the variable-section closed-angle cap-shaped pipe composite material part forming mold of the present invention;

[0025] Figure 5 This is a schematic diagram of the split module structure of the variable-section closed-angle cap-type pipeline composite material part forming mold of the present invention.

[0026] Figure: 1. Main mold; 11. Module slot; 2. Split module; 21. Fixing portion; 22. Connecting portion; 23. Rocker portion; 3. Composite material part of variable-section closed-angle cap-shaped pipe; 4. Bolt hole; 5. Dowel pin hole; 6. Jackscrew hole. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments and drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only preferred embodiments of the present invention, not all embodiments, and are not intended to limit the present invention in any other form. Any person skilled in the art may use the disclosed technical content to make changes or modifications. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

[0028] Example 1

[0029] This embodiment is a variable cross-section closed angle cap-shaped pipe composite material part forming mold, including an outer mold and a core mold, the outer mold includes an upper mold body and a lower mold body, the lower mold body is divided into a main mold body 1 and a split module 2, such as Figures 3 to 5 As shown, the split module 2 is detachably embedded in the upper edge of the main mold body 1 and in contact with the variable-section closed-angle hat-type pipe composite material part, and is used to lift and demould the formed variable-section closed-angle hat-type pipe composite material part, thereby solving the problem of difficulty in demoulding the variable-section closed-angle hat-type pipe composite material part. The variable-section closed-angle hat-type pipe composite material part can be smoothly demoulded, thereby ensuring the product quality during the demoulding process.

[0030] For the forming die of the variable cross-section closed-angle hat-shaped pipeline composite part described in this embodiment, the split module 2 is arranged at one end on one side of the main die body 1, at the closed-angle area at the end of the variable cross-section closed-angle hat-shaped pipeline composite part 3. Since the two ends of the variable cross-section closed-angle hat-shaped pipeline composite part are closed-angled, it is found through experiments that the demolding can be completed by only arranging the split module at one end. Therefore, in this example, the split module is arranged at one end, but the situation where split modules are provided on both sides of both ends is not excluded. In this example, choosing to set one split mold mainly considers that such a setting can facilitate operation on the premise of ensuring the smooth demolding of the part, and considering that setting more split modules will affect the forming quality of the entire mold and the design is also complex.

[0031] As a preferred implementation manner, in this embodiment, the split module 2 is arranged on the inner surface of the main die body 1, and its lower part extends to the bottom (hat top) of the variable cross-section closed-angle hat-shaped pipeline composite part 3. That is, the split module 2 is a module with a Z-shaped cross-section, which includes a fixing part 21, a connecting part 22 and a rocker part 23; the fixing part 21 is located in the brim area of the part and is used for connecting and fixing with the main die body 1; the connecting part 22 connects the fixing part 21 and the rocker part 23; the rocker part 23 is located in the hat top area of the part and is used for lifting the variable cross-section closed-angle hat-shaped pipeline composite part 3 during demolding. Specifically, the fixing part 21 is provided with bolt holes 4, positioning pin holes 5 and setscrew holes 6; the bolt holes 4 and positioning pin holes 5 are used for positioning and assembling the split module 2 on the main die body 1; the setscrew holes 6 are used for the setscrew to lift the formed variable cross-section closed-angle hat-shaped pipeline composite part 3 for demolding. In this embodiment, the thickness of the split module 2 is 10 - 15 mm, and the thickness of the connecting part 22 is at least 12 - 15 mm. This thickness range can ensure its connection strength, effectively transfer the force of the setscrew to the rocker part, and does not affect the overall heat absorption of the mold and the forming effect of the part. Correspondingly, for the forming die of the variable cross-section closed-angle hat-shaped pipeline composite part described in this embodiment, the main die body 1 is provided with a module embedding groove 11 for the split module 2 to be embedded. The depth of the module embedding groove 11 is equivalent to the thickness of the split module 2, and the upper edge of the module embedding groove 11 is provided with corresponding bolt holes 4, positioning pin holes 5 and setscrew holes 6, and it is positioned and connected with the split module 2 through a cylindrical pin and a bolt.

[0032] In addition, in this embodiment, the width of the split module 2 is one-fourth to one-half of the longitudinal length of the variable cross-section closed-angle hat-shaped pipeline composite part (3), which ensures that the part can be successfully lifted without damage and with the least effort.

[0033] In this embodiment, the fixing part 21, the connecting part 22, and the rocker part 23 of the split module 2 are designed to have the same width. However, it does not exclude the design method of using different widths for other parts. In this embodiment, the width of the fixing part of the split module is greater than half of the bottom of the variable cross-section closed-angle cap-shaped pipe composite part, leaving positions for bolts and pins. The height of the connecting part is limited by the height of the variable cross-section closed-angle cap-shaped pipe composite part, and the width of the rocker part is half of the top of the variable cross-section closed-angle cap-shaped pipe composite part, ensuring that the part can be successfully lifted without damage and with the least effort. In other embodiments, other deformation designs can be adopted.

[0034] Embodiment 2

[0035] In this embodiment, the forming die described in Embodiment 1 is used for the forming and demolding of the variable cross-section closed-angle cap-shaped pipe composite part. The structure of the variable cross-section closed-angle cap-shaped pipe composite part is as Figure 1 and Figure 2 shown. Both ends of it have closed-angle regions, and the demolding directions are opposite after forming. Moreover, due to the hot pressing effect of the autoclave, the core mold is tightly attached to the external mold, clamping the cap-shaped pipe composite part in the middle. If a hard demolding method is adopted, it is easy to cause the part to be injured or even damaged, resulting in unqualified produced parts or potential hazards in the later use of the parts. The specific operations for forming and demolding using the forming die described in Embodiment 1 include the following steps:

[0036] S1: Die assembly: First, through cylindrical pins and connecting bolts, the split module 2 is embedded into the module slot 11 on the main mold body 1 and positioned, connected, and fixed using the bolt holes 4 and positioning pin holes 5 to form a complete lower mold body, and the ejector screw is installed. At the same time, ensure that the step difference and gap between the split module and the main mold body are as small as possible.

[0037] S2: Laying and curing: The composite prepreg for preparing the variable cross-section closed-angle cap-shaped pipe is laid on the core mold and the lower mold body assembled in step S1 according to requirements, and then the mold is closed and sealed. The device with the laid material is sent into the autoclave, and the curing process of the part is completed according to the specified parameters.

[0038] S3: Part demolding: Remove the cylindrical pins and connecting bolts between the main mold body 1 and the split module 2, lift the split module 2 through the ejector screw, and the split module 2 drives the formed part to smoothly demold from the lower mold body. Then, remove the core mold to obtain a formed variable cross-section closed-angle cap-shaped pipe composite part with good quality.

[0039] Thus, by separately designing the main mold body and the split module, the present invention solves the problem of difficult demolding of the variable cross-section closed-angle cap-shaped pipeline composite part, enables the smooth demolding of the formed variable cross-section closed-angle cap-shaped pipeline composite part, and ensures the product quality during the demolding process. The design of the mold is simple, and the operation is also very simple, but the effect is remarkable. In addition, the design concept of the present invention by designing the split module on the main mold body can more widely solve the demolding problems of more closed-angle parts, and has very good application value and promotion space.

[0040] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the same elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed invention.

[0041] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A forming and demolding method for a variable cross-section closed-angle hat-shaped pipeline composite part, characterized in that: The mold for forming includes an outer mold and a core mold. The outer mold includes an upper mold body and a lower mold body. The lower mold body is divided into a main mold body and a split module. The split module is detachably embedded in the upper edge opening of the main mold body and contacts the variable cross-section closed-angle cap-shaped pipe composite part, and is used to jack up and demold the formed variable cross-section closed-angle cap-shaped pipe composite part. The split module is arranged at one end on one side of the main mold body and is located at the closed-angle area at the end of the variable cross-section closed-angle cap-shaped pipe composite part. And the split module is arranged on the inner surface of the main mold body, and its lower part extends to the cap top area of the variable cross-section closed-angle cap-shaped pipe composite part. The split module is a module with a Z-shaped cross-section, and it includes a fixing part, a connecting part and a toggle part. The fixing part is located in the brim area of the variable cross-section closed-angle cap-shaped pipe composite part and is used to connect and fix with the main mold body. The toggle part is located in the cap top area of the variable cross-section closed-angle cap-shaped pipe composite part and is used to lift up the variable cross-section closed-angle cap-shaped pipe composite part during demolding. The connecting part connects the fixing part and the toggle part. The forming and demolding of the variable cross-section closed-angle cap-shaped pipe composite part includes the following steps: S1: Mold assembly: First, through cylindrical pins and connecting bolts, the split module is embedded into the module slot on the main mold body and is positioned, connected and fixed using bolt holes and positioning pin holes to form a complete lower mold body, ensuring that the step difference and gap between the split module and the main mold body are as small as possible. S2: Laying and curing: The composite prepreg for preparing the variable cross-section closed-angle cap-shaped pipe is laid on the core mold and the lower mold body assembled in step S1 according to requirements, and then the mold is closed and sealed. The device with the laid material is sent into the autoclave, and the curing procedure of the part is completed according to the specified parameters. S3: Part demolding: Remove the cylindrical pins and connecting bolts between the main mold body and the split module, install the ejector screw, jack up the split module through the ejector screw, and the split module drives the formed part to smoothly demold from the lower mold body. Then remove the core mold to obtain the formed variable cross-section closed-angle cap-shaped pipe composite part.

2. The forming and demolding method of the variable cross-section closed-angle hat-shaped pipeline composite material part according to claim 1, characterized in that: The fixing part is provided with bolt holes, positioning pin holes and ejector screw holes. The bolt holes and positioning pin holes are used for positioning, assembling and fixing the split module on the main mold body. The ejector screw holes are used for the ejector screw to jack up and demold the formed variable cross-section closed-angle cap-shaped pipe composite part.

3. The forming and demolding method of the variable cross-section closed-angle hat-shaped pipeline composite material part according to claim 2, characterized in that: The thickness of the split module is 10 - 15 mm; its width is one-fourth to one-half of the longitudinal length of the variable cross-section closed-angle cap-shaped pipe composite part.

4. The forming and demolding method of the variable cross-section closed-angle hat-shaped pipeline composite material part according to claim 3, characterized in that: The length of the fixing part of the split module is greater than half of the brim width of the variable cross-section closed-angle cap-shaped pipe composite part, reserving positions for bolts and pins. The length of the connecting part of the split module is limited by the height of the variable cross-section closed-angle cap-shaped pipe composite part. The length of the toggle part of the split module is half of the cap top width of the variable cross-section closed-angle cap-shaped pipe composite part, ensuring that the part can be successfully lifted without damage and with the least effort.

5. The forming and demolding method of the variable cross-section closed-angle hat-shaped pipeline composite material part according to claim 4, characterized in that: The main body is provided with module embedding grooves for the split modules to be embedded. The depth of the module embedding grooves is equivalent to the thickness of the split modules. And corresponding bolt holes, dowel pin holes and setscrew holes are provided at the upper edges of the module embedding grooves, and they are positioned and connected with the split modules through dowel pins and bolts.

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