A spherical split core tooling for fiber winding and winding forming method

Abstract

The application relates to a spherical split core mold tool for fiber winding and a winding forming method, and relates to the technical field of fiber winding forming, and comprises a main shaft and core mold petals, a telescopic piece connecting the main shaft and the core mold petals, and a first telescopic piece, a second telescopic piece,..., and an i-th telescopic piece, i>=2, which are independently arranged on each core mold petal along the axial direction of the main shaft; the core mold petal and the telescopic structure are connected through a guide groove arranged on the core mold petal; the guide groove comprises a first groove and a second groove, and the included angle alpha of the first groove and the second groove is 90 DEG <= alpha < 180 DEG. The tool divides the core mold, which plays a bearing role in the winding process, into multiple petals and guarantees the overall bearing performance in the winding process through the telescopic piece; after the winding is completed, the core mold petals are separated and rotated through the cooperation of the telescopic piece and the guide groove, so that the maximum outer diameter of the tool is smaller than the opening diameter of the fiber shell, and then the tool is withdrawn from the inside of the fiber shell, so that the efficiency of the winding forming is improved.

Description

Technical Field

[0001] The invention relates to the technical field of filament winding molding, and in particular to a spherical split-flap core mold tooling for filament winding and a winding molding method. Background Art

[0002] The fiber-wound casing of a solid rocket motor, especially a large-sized fiber-wound casing, requires a core mold as a supporting structure during the manufacturing and winding process to complete the fiber winding process.

[0003] At present, sand core molds are commonly used for winding molding. For example, CN113123897A discloses a method for molding a solid rocket engine combustion chamber charge holder. Molding steps: S1, design a core mold molding tool, install the charge holder at the specified position, then fill the core mold tool with water-soluble sand core filler, put it into the furnace for drying, and finally disassemble the core mold tool to achieve overall molding; S2, brush adhesive on the surface of the core mold charge holder, form a release layer on the remaining core mold surface, perform inner insulation layer overmolding, perform fiber winding according to a certain winding tension, perform inner insulation layer pre-vulcanization, and remove the fiber; S3, perform fiber winding on the surface of the inner insulation layer, and then solidify the winding layer after reaching the specified thickness; S4, after the combustion chamber shell is solidified, disassemble the winding mandrel, take out the sand core mold and melt it, and complete the separation of the core mold and the inner insulation layer.

[0004] CN103883871A discloses a lightweight, high-temperature, high-pressure composite gas cylinder and its manufacturing method. The cylinder comprises two nozzles at each end and a central cylinder body. The cylinder body comprises, from the inside out, an ablation-resistant thin-walled metal liner, a ceramic tile insulation layer, a rubber insulation layer, and a wrapping layer made of a carbon fiber-reinforced resin-based composite material. The manufacturing method includes the following steps: 1) ellipsoidal molding; 2) sand core molding; 3) metal liner molding; 4) insulation layer molding; 5) wrapping layer molding; and 6) demolding and sand core dissolution.

[0005] However, when using a sand core mold for winding molding, the core mold can only be used once, and it takes a lot of time to clean it after use. At the same time, the sand core mold has to be made again, which makes the entire production cycle of the winding shell longer, which is not conducive to the efficient production of the fiber winding shell. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a spherical split core mold tooling and winding molding method for fiber winding, so as to solve the defect of low efficiency in fiber winding shell production when using sand core mold for winding molding.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a spherical split-type core mold tooling for filament winding, the spherical split-type core mold tooling for filament winding comprising:

[0009] A main shaft and a core mold piece, and a telescopic piece connecting the main shaft and the core mold piece, wherein each core mold piece is independently configured with a first telescopic piece, a second telescopic piece, ..., an i-th telescopic piece along the axial direction of the main shaft, where i≥2;

[0010] The core mold flap and the telescopic structure are connected via guide grooves provided on the core mold flap;

[0011] The guide groove includes a first groove and a second groove that are connected, and an included angle α between the first groove and the second groove is 90°≤α<180°.

[0012] The spherical split-petal core mold tooling for fiber winding provided by the present invention divides the core mold that plays a load-bearing role in the winding process into multiple petals, and ensures the overall load-bearing performance during the winding process through telescopic parts; after the winding is completed, the telescopic parts and guide grooves are used to separate and rotate the core mold petals so that they are evenly distributed along the main shaft, so that the maximum outer diameter of the tooling is smaller than the opening diameter of the fiber shell, thereby realizing the withdrawal of the tooling from the inside of the fiber shell, thereby improving the efficiency of winding molding and reducing costs.

[0013] As a preferred technical solution of the present invention, the first telescopic member is connected to the main shaft through a hinge.

[0014] As a preferred technical solution of the present invention, the i-th telescopic member is connected to the main shaft via a sliding member; the i-th telescopic member and the sliding member are movably connected.

[0015] As a preferred technical solution of the present invention, the sliding member reciprocates along the axial direction of the main shaft.

[0016] As a preferred technical solution of the present invention, a guide member is arranged between the sliding member and the main shaft.

[0017] As a preferred technical solution of the present invention, the core mold petal is a petal body obtained by dividing a sphere into n equal parts, where n≥3.

[0018] As a preferred technical solution of the present invention, the telescopic member is telescopic along the axial direction of the telescopic member.

[0019] As a preferred technical solution of the present invention, the telescopic member includes: an electric telescopic rod and / or a hydraulic telescopic rod.

[0020] In a second aspect, the present invention provides a winding method for a spherical fiber body, the winding method comprising:

[0021] The spherical split-type core mold tooling for fiber winding described in the first aspect is used.

[0022] As a preferred technical solution of the present invention, the winding molding method includes:

[0023] The telescopic parts of the spherical split core mold tooling used for fiber winding are controlled to extend so that the core mold petals fit together, and then the fiber winding and molding are carried out. After the molding is completed, the telescopic structure is controlled to contract so that the core mold petals are separated from the molded fiber profile.

[0024] Compared with the existing technical solutions, the present invention has the following beneficial effects:

[0025] The spherical split-petal core mold tooling for fiber winding provided by the present invention divides the core mold that plays a load-bearing role in the winding process into multiple petals, and ensures the overall load-bearing performance during the winding process through telescopic parts; after the winding is completed, the core mold petals are separated and rotated by utilizing the telescopic parts and guide grooves so as to be evenly distributed along the main axis, so that the maximum outer diameter of the tooling is smaller than the opening diameter of the fiber shell, thereby realizing the withdrawal of the tooling from the inside of the fiber shell, thereby improving the efficiency of winding molding and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a schematic diagram of the expansion of a spherical split-petal core mold tooling for fiber winding provided by an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of the contraction of a spherical split-type core mold tooling for fiber winding provided by an embodiment of the present invention.

[0028] In the figure: 100-main shaft, 200-core mold flap, 300-telescopic part, 400-sliding part.

[0029] The present invention is further described in detail below. However, the following examples are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention shall be subject to the claims. DETAILED DESCRIPTION

[0030] To better illustrate the present invention and facilitate understanding of the technical solutions of the present invention, typical but non-limiting embodiments of the present invention are as follows:

[0031] This embodiment provides a spherical split-flap core mold tooling for fiber winding, such as Figure 1 and Figure 2 As shown, the spherical split-type core mold tooling for fiber winding includes:

[0032] A main shaft 100 and a core mold piece 200, and a telescopic member 300 connecting the main shaft 100 and the core mold piece 200, wherein each core mold piece 200 is independently configured with a first telescopic member, a second telescopic member, ..., an i-th telescopic member along the axial direction of the main shaft 100, where i ≥ 2;

[0033] The core mold piece 200 and the telescopic structure are connected via a guide groove provided on the core mold piece 200;

[0034] The guide groove includes a first groove and a second groove that are connected, and an included angle α between the first groove and the second groove is 90°≤α<180°.

[0035] In the present invention, fiber winding refers to winding the fiber on a core mold according to a set winding trajectory and then molding it. The fiber used is a fiber prepreg or fiber, or the fiber is coated with a resin material after being wound in sections for a set number of layers and then cured and molded. The spherical fiber shell obtained by molding can be the head of a rocket solid engine shell, etc., or other fiber shells with a spherical surface.

[0036] Specifically, the fibers and adhesive materials used can be reasonably selected and designed according to the purpose of the final molded product, and the present invention does not make specific limitations.

[0037] In the present invention, through the cooperation of the telescopic rod and the guide groove, it can be achieved that when the telescopic rod is in the extended state, each core mold piece 200 can fit tightly together. When the telescopic rod is in the shortened state, each core mold piece 200 can rotate around the axis at a certain angle through the action of the guide groove, thereby achieving contraction and then being able to separate from the fiber molding.

[0038] In the present invention, the first groove is distributed along the arc line of the core mold flap, and the arc line refers to the arc line extending from the spherical vertex of the spherical fiber shell toward the sphere. When the telescopic part and the guide groove are contracted, the connecting part moves from the first groove to the second groove.

[0039] In the present invention, it is preferred to control the length of the first groove to be greater than the length of the second groove to meet the requirements of efficient preparation of the solid rocket engine head. When preparing other fiber-wound moldings, the lengths of the first groove and the second groove can be reasonably designed based on the volume required after the core mold shrinks.

[0040] The first telescopic member is connected to the main shaft 100 via a hinge.

[0041] In the present invention, when the first telescopic part is connected to the main shaft 100, it can be designed based on the spherical fiber body and connected to the end of the main shaft 100. At this time, a complete sphere can be formed after molding, or on the shaft body of the main shaft 100, there are structures such as holes on the top of the sphere formed.

[0042] The i-th telescopic member is connected to the main shaft 100 via a sliding member 400 ; the i-th telescopic member and the sliding member 400 are movably connected.

[0043] In the present invention, the i-th telescopic member slides with the main shaft 100 through the sliding member 400, which can achieve synchronous movement of the sliding member 400 when the telescopic member 300 is extended or shortened, thereby improving the extension and contraction efficiency of the tooling.

[0044] In the present invention, each of the core mold flaps 200 is independently configured with the first telescopic part, the second telescopic part,..., the i-th telescopic part along the axial direction of the main shaft 100, i≥2. For example, the first telescopic part is connected to the main shaft 100 through a hinge, and the subsequent second telescopic part, the third telescopic part, the fourth telescopic part,..., and the i-th telescopic part, i≥2, are all connected to the main shaft 100 through a sliding part 400.

[0045] The sliding member 400 reciprocates along the axial direction of the main shaft 100 .

[0046] A guide member is disposed between the sliding member 400 and the main shaft 100 .

[0047] In the present invention, a guide member is configured between the sliding member 400 and the main shaft 100, so that the sliding member 400 can slide along a predetermined direction when sliding, thereby preventing the sliding member 400 from rotating around the main shaft 100, resulting in unreasonable transformation of the telescopic member 300 and the core mold flap 200.

[0048] In the present invention, the guide member achieves guidance through a concave-convex matching structure. For example, a protrusion is set on the main shaft 100, and a corresponding groove is configured on the sliding member 400, so that the protrusion and the groove match to prevent the sliding member 400 from rotating around the main shaft 100.

[0049] The telescopic member 300 is telescopic along the axial direction of the telescopic member 300 .

[0050] In the present invention, the telescopic member 300 refers to a component that can be extended and shortened along its axial direction, and is composed of a plurality of mutually nested rods, which can freely extend and retract within a certain range.

[0051] Wherein, the telescopic member 300 includes: an electric telescopic rod and / or a hydraulic telescopic rod.

[0052] The core mold petal 200 is a petal body obtained by dividing a sphere into n equal parts, where n≥3.

[0053] In the present invention, each of the petals obtained by dividing the petals into n equal parts is independently provided with a corresponding telescopic member 300 , that is, the total number of the telescopic members 300 is n×i.

[0054] In the present invention, the materials of the core mold flap 200, the main shaft 100 and the telescopic member 300 can be reasonably determined according to actual needs while ensuring that the formation of the spherical fiber body is not affected during the winding process. For example, light alloys, mold steel and other metal materials can be used.

[0055] Furthermore, this embodiment provides a winding molding method for a spherical fiber body, the winding molding method comprising:

[0056] The process is carried out using the spherical split-type core mold tooling for fiber winding as described above, specifically including: controlling the telescopic parts of the spherical split-type core mold tooling for fiber winding to stretch so that the core mold petals fit together, then performing fiber winding and molding, and after molding is completed, controlling the telescopic structure to contract so that the core mold petals are separated from the molded fiber profile.

[0057] In the present invention, the fiber winding and post-forming method is reasonably selected and designed according to the different configured adhesives, such as the curing method of the adhesive. Usually, the curing methods of the adhesive include room temperature curing, heating curing, ultraviolet curing, infrared curing and the like.

[0058] Furthermore, in order to illustrate the effects that can be achieved by the spherical split-type core mold tooling for fiber winding provided by the present invention, the following actual examples are used for illustration, as follows:

[0059] Example 1

[0060] This embodiment provides a spherical split-flap core mold tooling for filament winding, specifically comprising:

[0061] A main shaft and a core mold piece, a telescopic piece connecting the main shaft and the core mold piece, and each core mold piece is independently configured with a first telescopic piece and an i-th telescopic piece along the axial direction of the main shaft, where i=2;

[0062] The core mold flap and the telescopic structure are connected via guide grooves provided on the core mold flap;

[0063] The guide groove includes a first groove and a second groove that are connected, and the angle α between the first groove and the second groove is 90°.

[0064] Wherein, the first telescopic member is connected to the main shaft through a hinge.

[0065] The i-th telescopic member is connected to the main shaft via a sliding member, the sliding member reciprocates along the axial direction of the main shaft, and a guide member is arranged between the sliding member and the main shaft.

[0066] Wherein, the telescopic member is telescopic along the axial direction of the telescopic member, and the telescopic member is a hydraulic telescopic rod.

[0067] The core mold petals are petal bodies obtained by dividing a spherical surface into n equal parts, where n=18.

[0068] Example 2

[0069] This embodiment provides a spherical split-flap core mold tooling for filament winding, specifically comprising:

[0070] a main shaft and a core mold segment, a telescopic piece connecting the main shaft and the core mold segment, each of the core mold segments being independently provided with a first telescopic piece, a second telescopic piece, and an i-th telescopic piece along the axial direction of the main shaft, i=3;

[0071] The core mold segment and the telescopic structure are connected through a guide groove provided on the core mold segment.

[0072] The guide groove comprises a first groove and a second groove, and the included angle α between the first groove and the second groove is 120°.

[0073] The first telescopic piece is connected to the main shaft through a hinge.

[0074] The i-th telescopic piece is connected to the main shaft through a sliding piece, the sliding piece reciprocates along the axial direction of the main shaft, and a guide piece is arranged between the sliding piece and the main shaft.

[0075] The telescopic piece telescopes along the axial direction of the telescopic piece, and the telescopic piece is an electric telescopic rod.

[0076] The core mold segment is a spherical segment obtained by equally dividing a spherical surface, and n=20.

[0077] Embodiment 3

[0078] The embodiment provides a spherical segmented core mold tool for fiber winding, and specifically comprises:

[0079] a main shaft and a core mold segment, a telescopic piece connecting the main shaft and the core mold segment, each of the core mold segments being independently provided with a first telescopic piece and an i-th telescopic piece along the axial direction of the main shaft, i=2;

[0080] The core mold segment and the telescopic structure are connected through a guide groove provided on the core mold segment.

[0081] The guide groove comprises a first groove and a second groove, and the included angle α between the first groove and the second groove is 145°.

[0082] The first telescopic piece is connected to the main shaft through a hinge.

[0083] The i-th telescopic piece is connected to the main shaft through a sliding piece, the sliding piece reciprocates along the axial direction of the main shaft, and a guide piece is arranged between the sliding piece and the main shaft.

[0084] The telescopic piece telescopes along the axial direction of the telescopic piece, and the telescopic piece is a hydraulic telescopic rod.

[0085] The core mold segment is a spherical segment obtained by equally dividing a spherical surface, and n=36.

[0086] Embodiment 4

[0087] The embodiment provides a spherical split core mold tool for fiber winding, and particularly comprises the following:

[0088] a main shaft, core mold petals, a telescopic part connecting the main shaft and the core mold petals, and a first telescopic part, a second telescopic part and an i-th telescopic part, i=3, independently arranged on each core mold petal along the axial direction of the main shaft.

[0089] The core mold petals and the telescopic structure are connected through a guide groove arranged on the core mold petals.

[0090] The guide groove comprises a first groove and a second groove, and the included angle alpha between the first groove and the second groove is 90 degrees.

[0091] The first telescopic part is connected to the main shaft through a hinge.

[0092] The i-th telescopic part is connected to the main shaft through a sliding part, the sliding part reciprocates along the axial direction of the main shaft, and a guide part is arranged between the sliding part and the main shaft.

[0093] The telescopic part telescopes along the axial direction of the telescopic part, and the telescopic part is an electric telescopic rod.

[0094] The core mold petals are spherical and are divided into n petals, n=12.

[0095] The tool obtained through the above embodiment is used for winding and forming a spherical fiber body, as follows: the telescopic part of the tool for winding a spherical split core mold is controlled to expand, so that the core mold petals are attached, then fiber winding and forming are performed, after the forming is completed, the telescopic structure is controlled to contract, so that the core mold petals are separated from the formed fiber profile.

[0096] The tool provided by the embodiment separates the core mold into multiple petals during winding and guarantees the overall bearing performance in the winding process by means of the telescopic part; after the winding is completed, the core mold petals are separated and rotated by means of the telescopic part and the guide groove, so that the maximum outer diameter of the tool is smaller than the opening diameter of the fiber shell, and then the tool is withdrawn from the inside of the fiber shell, thereby improving the efficiency of winding and forming.

[0097] The above describes the preferred embodiments of the application, but the application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the application within the technical concept of the application, and the simple modifications all belong to the protection scope of the application.

[0098] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the application will not describe various possible combinations again.

[0099] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A spherical split-flap core mold tooling for fiber winding, characterized in that: The spherical split-type core mold tooling for fiber winding includes: A main shaft and a core mold piece, and a telescopic piece connecting the main shaft and the core mold piece, wherein each core mold piece is independently configured with a first telescopic piece, a second telescopic piece, ..., an i-th telescopic piece along the axial direction of the main shaft, where i≥2; The core mold flap and the telescopic structure are connected via guide grooves provided on the core mold flap; The guide groove includes a first groove and a second groove that are connected, and an included angle α between the first groove and the second groove is 90°≤α<180°.

2. The spherical split-type core mold tooling for fiber winding according to claim 1, characterized in that: The first telescopic member is connected to the main shaft through a hinge.

3. The spherical split-type core mold tooling for fiber winding according to claim 1, characterized in that: The i-th telescopic member is connected to the main shaft via a sliding member; the i-th telescopic member and the sliding member are movably connected.

4. The spherical split-type core mold tooling for fiber winding according to claim 3, characterized in that: The sliding member reciprocates along the axial direction of the main shaft.

5. The spherical split-type core mold tooling for fiber winding according to claim 3, characterized in that: A guide member is arranged between the sliding member and the main shaft.

6. The spherical split-type core mold tooling for fiber winding according to claim 1, characterized in that: The core mold petal is a petal body obtained by dividing a sphere into n equal parts, where n≥3.

7. The spherical split-type core mold tooling for fiber winding according to claim 1, characterized in that: The telescopic member is telescopically adapted to extend and retract along its axial direction.

8. The spherical split-type core mold tooling for fiber winding according to claim 1, characterized in that: The telescopic member includes: an electric telescopic rod and / or a hydraulic telescopic rod.

9. A winding method for a spherical fiber body, characterized in that: The winding method comprises: The process is carried out using the spherical split-type core mold tooling for fiber winding as described in any one of claims 1 to 8.

10. The winding method according to claim 9, wherein: The winding method comprises: The telescopic parts of the spherical split core mold tooling used for fiber winding are controlled to extend so that the core mold petals fit together, and then the fiber winding and molding are carried out. After the molding is completed, the telescopic structure is controlled to contract so that the core mold petals are separated from the molded fiber profile.

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