Modularized extension type composite material winding mold

Abstract

The embodiment of the invention provides a modular extension type composite material winding mold which comprises a core shaft, and the core shaft comprises a winding shaft in the middle and connecting shafts at the two ends. The winding lengthening shaft is coaxially fixed on the winding shaft on one side or two sides of the core shaft; and the connecting lengthening shaft is coaxially fixed on the connecting shaft on the inner side of the winding lengthening shaft. According to the embodiment of the invention, an integral mold is optimized into a modular lengthening assembly form, so that the weight and length of a single module are effectively reduced, the storage and maintenance difficulty is reduced, the mold structure stability is ensured, meanwhile, the requirement of the required mold shaft length can be met by adjusting the number of the winding lengthening shafts and the number of the connecting lengthening shafts, and the production efficiency is improved. The universality of the die is effectively improved, and the manufacturing and maintenance cost of the die is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material winding molding, and particularly to a modular extended composite material winding mold. Background Art

[0002] Composite materials are widely used in fields such as aerospace due to their superior properties of light weight and high strength. For example, spacecraft structural components such as fairings, solid rocket motor casings, and fuel tanks are mainly formed by the winding process. An important part of the winding molding is the design of the mold. Reusable combined molds have the characteristics of stable winding quality and outstanding economy, and are the most widely used winding molds.

[0003] The winding molding technology involves impregnating continuous fibers with resin or using prepregs / tape, winding them onto a cylindrical mandrel according to the designed ply pattern, and then completing the forming of the main straight cylinder section through processes such as curing and demolding. This technology can generally be divided into dry method, wet method, and semi-dry method. Among them, the wet winding molding is most widely used in the molding process of composite material drive shafts.

[0004] For wet winding, the currently commonly used mold is composed of a first connecting rod, a first head, a mandrel, a second head, and a second connecting rod. By flexibly changing the fiber angle and ply structure, it is easy to adjust the strength distribution of the front and rear pipe sections, thereby controlling the torsional strength of the overall drive shaft and meeting the torsional performance requirements of multiple needs.

[0005] The mandrels of the winding molds used for drive shafts mostly adopt the steel pipe type rather than the frame type because the wet winding needs to ensure the resin content and has high forming quality requirements for both the inner and outer surfaces of the shaft. Therefore, the overall mold is heavy, and it can only produce composite material shafts of a single length specification. When the required shaft length is much shorter than the existing mold, a large amount of raw materials will be wasted. When the required shaft length is longer than the existing mold, only the option is to reopen the mold. Longer molds also occupy storage space, and long-term placement will cause the molds to become elliptical and bent, greatly increasing the storage and maintenance costs of the molds. Summary of the Invention

[0006] In view of the above problems existing in the prior art, the embodiments of the present invention provide a modular extended composite material winding mold to solve the technical problems in the prior art that the integral mold is heavy and can only produce composite material shafts of a single length specification, and has poor versatility.

[0007] The embodiments of the present invention provide a modular extended composite material winding mold, including:

[0008] A mandrel, the mandrel includes a winding shaft in the middle, both ends of the winding shaft are sealed by partition ribs, and connecting shafts coaxial with the winding shaft are fixedly arranged on the partition ribs on both sides of the winding shaft. The outer diameter of the connecting shaft is smaller than that of the winding shaft, and the end of the connecting shaft extends to the outside of the end of the winding shaft;

[0009] A winding extension shaft, the winding extension shaft is coaxially fixed on the winding shaft on one side or both sides of the mandrel;

[0010] A connecting extension shaft, the connecting extension shaft is coaxially fixed on the connecting shaft inside the winding extension shaft, and the end of the connecting extension shaft extends to the outside of the end of the winding extension shaft;

[0011] A large head, the outer end of the large head is sleeved and fixed on the connecting shaft or the connecting extension shaft on one side of the mandrel, its inner end is pressed and fixed on the winding shaft or the winding extension shaft, and its outer side is an arc surface;

[0012] A head idler, the head idler is sleeved and fixed on the connecting shaft or the connecting extension shaft outside the large head, and a demoulding ring is fixedly arranged on the head idler;

[0013] A small head, the outer end of the small head is sleeved and fixed on the connecting shaft or the connecting extension shaft on the other side of the mandrel, its inner end is pressed and fixed on the winding shaft or the winding extension shaft, and its outer side is an arc surface;

[0014] A tail idler, the tail idler is sleeved and fixed on the connecting shaft or the connecting extension shaft outside the small head.

[0015] In an embodiment, a first connection end plate is arranged at the end of the connecting shaft, an outer connection wing ring is arranged at the inner end of the connecting extension shaft, and a second connection end plate is arranged at its outer end. The outer connection wing ring at the end position of the connecting extension shaft is fixedly connected to the first connection end plate or the second connection end plate through an adapter plate and a connecting bolt.

[0016] In an embodiment, an inner connection wing ring is arranged at the end of the winding extension shaft, an outer connection wing ring is correspondingly arranged on the connecting extension shaft body of the connecting extension shaft, and the inner connection wing ring and the correspondingly arranged outer connection wing ring are fixedly connected through a connecting bolt.

[0017] In an embodiment, both the large head and the small head are pressed and fixed by round nuts arranged on the outside. The round nuts are screwed on the threaded sections with external threads correspondingly arranged on the connecting shaft or the connecting extension shaft.

[0018] In an embodiment, the round nuts are arranged in pairs.

[0019] In an embodiment, both the head idler and the tail idler are connected and fixed to the connecting shaft or the connecting extension shaft through socket bolts.

[0020] In one embodiment, a cutting ring is further provided between the inner end of the large head or the small head and the winding shaft or the extended winding shaft.

[0021] In one embodiment, mating rabbets are correspondingly provided at the butt joint positions of the large head or the small head and the winding shaft or the extended winding shaft, and the cutting ring is correspondingly arranged in the rabbet.

[0022] In one embodiment, ventilation holes are provided at both ends and inside the mold, and the inner cavity of the mold is communicated through the ventilation holes.

[0023] In one embodiment, the surface of the winding shaft or the extended winding shaft of the mold is a conical surface that is larger at the end close to the large head and smaller at the end close to the small head, and the surface taper is not less than the deflection of the mold.

[0024] Compared with the prior art, the beneficial effects of a modular extended composite material winding mold provided by an embodiment of the present invention are as follows: the embodiment of the present invention optimizes the integral mold into a modular extended assembled form, effectively reducing the weight and length of a single module, reducing the difficulty of storage and maintenance, and moreover, while ensuring the structural stability of the mold, the required mold shaft length requirements can be adapted by adjusting the number of extended winding shafts and connecting extended shafts, effectively increasing the versatility of the mold and reducing the mold manufacturing and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic cross-sectional structure view of a modular extended composite material winding mold provided by an embodiment of the present invention;

[0026] Figure 2 is a cross-sectional view of the assembled structure of the extended winding shaft and the connecting extended shaft of a modular extended composite material winding mold provided by an embodiment of the present invention;

[0027] Figure 3 is a cross-sectional view of the structure at the mandrel of a modular extended composite material winding mold provided by an embodiment of the present invention;

[0028] Figure 4 is a cross-sectional view of the structure of the head roller of a modular extended composite material winding mold provided by an embodiment of the present invention;

[0029] Figure 5 is a cross-sectional view of the structure at the cutting ring of a modular extended composite material winding mold provided by an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1. Head roller; 101. Sleeve part; 102. Roller part; 2. Demolding ring; 3. Round nut; 4. Large head; 5. Core shaft; 501. Winding shaft; 502. Connecting shaft; 503. Partition rib; 504. First connecting end plate; 6. Adapter plate; 7. Winding extension shaft; 701. Winding extension shaft body; 702. Inner connecting wing ring; 703. Reinforcing wing ring; 8. Small head; 9. Connecting extension shaft; 901. Connecting extension shaft body; 902. Outer connecting wing ring; 903. Second connecting end plate; 10. Tail roller; 11. Precision bolt; 12. Cutting ring; 13. Connecting bolt; 14. Vent hole; 15. Disassembly hole. Detailed implementation manners

[0032] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0033] Reference is made herein to the various aspects and features of the present application with reference to the accompanying drawings.

[0034] These and other features of the present application will become apparent from the following description of the preferred forms of the embodiments given as non-limiting examples with reference to the accompanying drawings.

[0035] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present application, which have the features as described in the claims and thus are all within the protection scope defined thereby.

[0036] When combined with the accompanying drawings, the above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description.

[0037] Hereinafter, specific embodiments of the present application will be described with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present application and can be implemented in various ways. Well-known and / or repetitive functions and structures have not been described in detail to clarify the true intention based on the user's historical operations and to avoid unnecessary or redundant details from obscuring the present application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but are merely used as a basis for the claims and a representative basis for teaching those skilled in the art to use the present application in substantially any suitable detailed structure in a variety of ways.

[0038] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", which may each refer to one or more of the same or different embodiments according to the present application.

[0039] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The embodiments given are only used to explain the present invention and are not intended to limit the scope of the present invention. The following will be further described in detail with reference to Figures 1-5 the preferred embodiments of the present invention:

[0040] As Figures 1-5 shown, an embodiment of the present invention provides a modular extended composite winding mold, including:

[0041] A mandrel 5, the mandrel 5 includes a winding shaft 501 in the middle, both ends of the winding shaft 501 are sealed by partition ribs 503, and connecting shafts 502 coaxial with the winding shaft 501 are fixedly arranged on the partition ribs 503 on both sides of the winding shaft 501. The outer diameter of the connecting shaft 502 is smaller than the outer diameter of the winding shaft 501, and the end of the connecting shaft 502 extends to the outside of the end of the winding shaft 501;

[0042] A winding extension shaft 7, the winding extension shaft 7 is coaxially fixed on the winding shaft 501 on one side or both sides of the mandrel 5;

[0043] A connecting extension shaft 9, the connecting extension shaft 9 is coaxially fixed on the connecting shaft 502 inside the winding extension shaft 7, and the end of the connecting extension shaft 9 extends to the outside of the end of the winding extension shaft 7;

[0044] A large head 4, the outer end of the large head 4 is sleeved and fixed on the connecting shaft 502 or the connecting extension shaft 9 on one side of the mandrel 5, its inner end is pressed and fixed on the winding shaft 501 or the winding extension shaft 7, and its outer side is an arc surface;

[0045] A head roller 1, the head roller 1 is sleeved and fixed on the connecting shaft 502 or the connecting extension shaft 9 outside the large head 4, and a demolding ring 2 is fixedly arranged on the head roller 1;

[0046] A small head 8, the outer end of the small head 8 is sleeved and fixed on the connecting shaft 502 or the connecting extension shaft 9 on the other side of the mandrel 5, its inner end is pressed and fixed on the winding shaft 501 or the winding extension shaft 7, and its outer side is an arc surface;

[0047] A tail roller 10, the tail roller 10 is sleeved and fixed on the connecting shaft 502 or the connecting extension shaft 9 outside the small head 8;

[0048] As Figure 4 shown, in one embodiment, the head roller 1 includes a sleeve portion 101, the inner diameter of the sleeve portion 101 matches the outer diameter of the connecting shaft 502 or the connecting extension shaft 9 to be sleeved. A roller portion 102 protrudes from the outer end of the sleeve portion 101, and a demolding ring 2 is integrally formed on the sleeve portion 101 inside the roller portion 102. The head roller 1 and the demolding ring 2 are used for positioning and driving the mold during the winding, curing and demolding processes;

[0049] As Figure 3 shown, in one embodiment, a first connection end plate 504 is provided at the end of the connection shaft 502. On the one hand, the first connection end plate 504 can provide a position for passing through the connection bolt 13 during elongation, and on the other hand, it can also play a role in supporting and strengthening the tube body of the connection shaft 502;

[0050] As Figure 2 shown, in one embodiment, the winding elongation shaft 7 includes a winding elongation shaft body 701. Keyways are correspondingly provided at both ends of the winding elongation shaft body 701. An inner connection wing ring 702 is provided at its outer end, and a circle of reinforcing wing rings 703 is also provided inside the keyway at its inner end;

[0051] As Figure 2 shown, in one embodiment, the connection elongation shaft 9 includes a connection elongation shaft body 901. Outer connection wing rings 902 are provided at the inner end and the middle shaft body of the connection elongation shaft body 901. A keyway is provided at the inner end of its shaft body, and the outer end of its shaft body is sealed by a second connection end plate 903. On the one hand, the second connection end plate 903 can provide a position for passing through the connection bolt 13, and on the other hand, it can also play a role in supporting and strengthening the connection elongation shaft body 901. That is, standard parts are formed at both ends of the connection elongation shaft body 901 through the correspondingly arranged outer connection wing rings 902 and the second connection end plate 903, and appropriate numbers can be selected for series elongation according to the usage requirements;

[0052] During actual use, elongation can be performed at one end of the mandrel 5 according to the required length of the composite material shaft, or elongation can be performed at both ends of the mandrel 5;

[0053] During elongation, the outer connection wing ring 902 at the end of the connection elongation shaft 9 is fixedly connected to the first connection end plate 504 or the second connection end plate 903 through the adapter plate 6 and the connection bolt 13. The outer connection wing ring 902 at the middle position of the connection elongation shaft body 901 is fixedly connected to the inner connection wing ring 702 at the end of the winding elongation shaft 7 through the connection bolt 13. By adding a support point at the end of the winding elongation shaft 7, the stability of the winding elongation shaft 7 can be effectively improved. During elongation, the winding elongation shaft 7 is sleeved into the connection elongation shaft 9 from the tail and connected to the connection elongation shaft 9 through the connection bolt 13 to realize axial pressing of the mold to prevent the mold surface joint from affecting demolding;

[0054] In one embodiment, both the large head 4 and the small head 8 are tightly fixed by the round nuts 3 provided on the outside to facilitate the installation and removal of the large head 4 and the small head 8. The round nuts 3 are screwed on the threaded sections with corresponding external threads on the connection shaft 502 or the connection elongation shaft 9. To ensure the pressing and fixing effect of the large head 4 and the small head 8, the round nuts 3 are arranged in pairs in the form of double nuts;

[0055] In one embodiment, the head roller 1 and the tail roller 10 are both connected and fixed to the connecting shaft 502 or the connecting extension shaft 9 by means of hinged bolts 11, so as to facilitate the installation and removal of the head roller 1 and the tail roller 10 while ensuring the connection effect;

[0056] like Figure 5 As shown, in one embodiment, a cutting ring 12 is further provided between the inner end of the large head 4 or the small head 8 and the winding shaft 501 or the winding extension shaft 7, and the large head 4 or the small head 8 and the winding shaft 501 or the winding extension shaft 7 are provided with matching tongues and grooves at the docking positions, and the cutting ring 12 is correspondingly provided in the tongue and groove, and the docking of the cutting ring 12 is achieved through the tongue and groove and its position is ensured to be stable. The purpose of providing the cutting ring 12 is to achieve cutting from the position of the cutting ring 12 after the product is wound, so as to avoid the cutting operation from damaging the mold surface. Of course, according to the winding angle of the product, the cutting ring 12 can be replaced with a hanging ring with hanging needles, and the hanging needles are arranged on the hanging ring in a circular array at intervals;

[0057] The curvature of the outer side surfaces of the large head 4 and the small head 8 must meet the curvature design requirements and are usually designed as arc surfaces with a certain curvature to ensure that the winding angle of the product is stable;

[0058] When the fiber tape is wound, resin will remain on the surface of the head joint, making it difficult to disassemble the head (including the large head 4 or the small head 8). Therefore, a disassembly hole 15 can be added at the small end of the head, so that during the disassembly process, a bolt can be screwed into the disassembly hole 15 as a fulcrum to more conveniently pull the head off.

[0059] In one embodiment, the mandrel 5, the winding extension shaft 7 and the connecting extension shaft 9 are all hollow tubular structures, and vents 14 are provided at both ends and inside of the mold. The internal cavity of the mold is connected through the vents 14, so that after the composite material is cured, cold air can be blown into the mold to accelerate the cooling of the mold and facilitate product demoulding;

[0060] In one embodiment, to facilitate demolding, the surface of the winding shaft 501 or the winding extension shaft 7 of the mold is a conical surface that is larger at one end close to the large head 4 and smaller at one end close to the small head 8, and its surface taper is not less than the mold deflection, that is, the entire mold surface is a conical surface, the large end is defined as the head, and the small end is defined as the tail, and a demolding ring 2 is provided on the head roller 1. The demolding ring 2 is fixed during demolding, and the product is ejected from the tail.

[0061] It should be noted that when designing the interfaces of the heads (including the large head 4 or the small head 8) and the interface of the winding extension shaft 7, they need to match the interface of the winding shaft 501, and the interface design of the connecting shaft 502 and the connecting extension shaft 9 should be kept consistent to ensure adaptability. The connecting extension shaft 9, the adapter plate 6, and the winding extension shaft 7 form an extension module. Multiple extension modules can be connected between the mandrel 5 and the head to achieve the purpose of extending the winding die surface of the composite material shaft. Of course, to ensure the surface roughness requirements of the die surface, chamfering is prohibited at the splicing joint of the ends of the winding shaft 501 and the winding extension shaft 7.

[0062] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A modular extended composite material winding mold, characterized in that Comprising: A mandrel (5), the mandrel (5) includes a winding shaft (501) in the middle, both ends of the winding shaft (501) are sealed by partition ribs (503), and connecting shafts (502) coaxial with the winding shaft (501) are fixedly arranged on the partition ribs (503) on both sides of the winding shaft (501). The outer diameter of the connecting shaft (502) is smaller than the outer diameter of the winding shaft (501), and the end of the connecting shaft (502) extends to the outside of the end of the winding shaft (501); A winding extension shaft (7), the winding extension shaft (7) is coaxially fixed on the winding shaft (501) on one or both sides of the mandrel (5); A connecting extension shaft (9), the connecting extension shaft (9) is coaxially fixed on the connecting shaft (502) inside the winding extension shaft (7), and the end of the connecting extension shaft (9) extends to the outside of the end of the winding extension shaft (7); A large head (4), the outer end of the large head (4) is sleeved and fixed on the connecting shaft (502) or the connecting extension shaft (9) on one side of the mandrel (5), its inner end is pressed and fixed on the winding shaft (501) or the winding extension shaft (7), and its outer side is an arc surface; A head idler (1), the head idler (1) is sleeved and fixed on the connecting shaft (502) or the connecting extension shaft (9) outside the large head (4), and a demolding ring (2) is fixedly arranged on the head idler (1); A small head (8), the outer end of the small head (8) is sleeved and fixed on the connecting shaft (502) or the connecting extension shaft (9) on the other side of the mandrel (5), its inner end is pressed and fixed on the winding shaft (501) or the winding extension shaft (7), and its outer side is an arc surface; A tail idler (10), the tail idler (10) is sleeved and fixed on the connecting shaft (502) or the connecting extension shaft (9) outside the small head (8).

2. The modular extended composite material winding mold according to claim 1, wherein: A first connection end plate (504) is arranged at the end of the connecting shaft (502), an outer connection wing ring (902) is arranged at the inner end of the connecting extension shaft (9), and a second connection end plate (903) is arranged at its outer end. The outer connection wing ring (902) at the end position of the connecting extension shaft (9) is fixedly connected with the first connection end plate (504) or the second connection end plate (903) through an adapter plate (6) and a connection bolt (13).

3. A modular extended composite winding mold according to claim 1, characterized in that: An inner connection wing ring (702) is arranged at the end of the winding extension shaft (7), an outer connection wing ring (902) is correspondingly arranged on the connecting extension shaft body (901) of the connecting extension shaft (9), and the inner connection wing ring (702) and the correspondingly arranged outer connection wing ring (902) are fixedly connected through a connection bolt (13).

4. A modular extended composite material winding mold according to claim 1, characterized in that: Both the large head (4) and the small head (8) are pressed and fixed by circular nuts (3) arranged on the outside. The circular nuts (3) are screwed on the threaded sections with corresponding external threads on the connecting shaft (502) or the connecting extension shaft (9).

5. The modular extended composite winding mold according to claim 4, characterized in that: The circular nuts (3) are arranged in pairs.

6. The modular extended composite material winding mold according to claim 1, characterized in that: Both the head idler (1) and the tail idler (10) are connected and fixed to the connecting shaft (502) or the connecting extension shaft (9) through precision bolts (11).

7. The modular extended composite material winding mold according to claim 1, characterized in that: A cutting ring (12) is further arranged between the inner end of the large head (4) or the small head (8) and the winding shaft (501) or the winding extension shaft (7).

8. A modular extended composite material winding mold according to claim 7, characterized in that: The large head (4) or the small head (8) and the docking position of the winding shaft (501) or the winding extension shaft (7) are correspondingly provided with mating rabbets, and the cutting ring (12) is correspondingly arranged in the rabbets.

9. A modular extended composite material winding mold according to claim 1, characterized in that: Vent holes (14) are arranged at both ends and inside the mold, and the internal cavity of the mold is communicated through the vent holes (14).

10. A modular extended composite material winding mold according to claim 1, characterized in that: The surface of the winding shaft (501) or the winding extension shaft (7) of the mold is a conical surface that is large at the end close to the large head (4) and small at the end close to the small head (8), and the surface taper is not less than the deflection of the mold.

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