Spherical surface sectioning type core mold tool for fiber winding and winding forming method

Abstract

The invention relates to a spherical split type core mold tool for fiber winding and a winding forming method, and relates to the technical field of fiber winding forming, the spherical split type core mold tool comprises a main shaft, core mold petals and telescopic pieces connecting the main shaft and the core mold petals, each core mold petal is independently provided with a first telescopic piece, a second telescopic piece,..., an ith telescopic piece in the axial direction of the main shaft, and i is larger than or equal to 2; the core mold petals and the telescopic structures are connected through guide grooves formed in the core mold petals. The guide groove comprises a first groove and a second groove which are communicated, and the included angle alpha between the first groove and the second groove is larger than or equal to 90 degrees and smaller than 180 degrees. According to the tool, the core mold playing a bearing role in the winding process is divided into multiple sections, and the overall bearing performance in the winding process is guaranteed by means of the telescopic pieces; and after winding is finished, the mandrel petals are separated and rotated through cooperation of the telescopic pieces and the guide grooves, so that the maximum outer diameter of the tool is smaller than the opening diameter of the fiber shell, then the tool is withdrawn from the interior of the fiber shell, and therefore the winding forming efficiency is improved.

Description

Technical Field

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

[0002] The filament-wound casing of a solid rocket motor, especially a large-sized filament-wound casing, requires a core mold as a supporting structure during the manufacturing and winding process to complete the filament 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 column fixing frame. Molding steps: S1, design a core mold molding tool, install a charge column fixing frame at a specified position, then fill the core mold tool with water-soluble sand core filler, put it into a 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 column fixing frame, form a demoulding layer on the surface of the remaining core mold, 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 a specified thickness; S4, after the combustion chamber shell is solidified, disassemble the winding mandrel, take out the sand core mold to melt, and complete the separation of the core mold and the inner insulation layer.

[0004] CN103883871A discloses a lightweight high-temperature and high-pressure composite gas cylinder and a manufacturing method thereof, comprising nozzles at both ends and a bottle body in the middle, wherein the bottle body comprises, from the inside to the outside, an ablation-resistant thin-walled metal liner, a ceramic tile insulation layer, a rubber insulation layer, and a winding layer, wherein the winding layer is a carbon fiber reinforced resin-based composite material. The manufacturing method comprises the following steps: 1) ellipsoid molding; 2) sand core molding; 3) metal liner molding; 4) insulation layer molding; 5) winding layer molding; 6) demoulding and sand core dissolution.

[0005] However, when using a sand core mold for winding molding, the core mold can only be used once, and a lot of time is needed 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 manufacturing fiber winding shells when using sand core molds 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-flap mandrel tooling for fiber winding, the spherical split-flap mandrel tooling for fiber winding comprising:

[0009] A main shaft and a core mold half, a telescopic member connecting the main shaft and the core mold half, each core mold half independently being provided with a first telescopic member, a second telescopic member, ..., an i-th telescopic member along the axial direction of the main shaft, i≥2;

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

[0011] The guide groove includes a first groove and a second groove that are connected, and an 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 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.

[0013] As a preferred technical solution of the present invention, the first telescopic member is connected to the main shaft via 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 spherical surface into n equal parts, where n≥3.

[0018] As a preferred technical solution of the present invention, the telescopic member telescopes 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-flap 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 forming method comprises:

[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 shrink so that the core mold petals are separated from the molded fiber profile.

[0024] Compared with the prior art 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 in 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 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 development 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-petal core mold tooling for fiber winding provided in 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 only 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 solution 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-flap core mold tooling for fiber winding includes:

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

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

[0034] The guide groove comprises a first groove and a second groove which 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 for curing and molding. 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 bonding 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 half 200 can fit tightly together. When the telescopic rod is in the shortened state, each core mold half 200 can rotate around the axis at a certain angle through the guide groove, thereby achieving contraction and then being able to be separated from the fiber molding.

[0038] In the present invention, the first groove is distributed along the arc line of the core mold, 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 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] Wherein, 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 according to 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. At this time, there are structures such as holes on the top of the formed sphere.

[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, so that the sliding member 400 can move synchronously 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 halves 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. Exemplarily, 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] Wherein, a guide member is arranged between the sliding member 400 and the main shaft 100 .

[0047] In the present invention, a guide member is arranged between the sliding member 400 and the main shaft 100 so that the sliding member 400 can slide in a predetermined direction, 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 member that can be extended and shortened along its axial direction, and is composed of a plurality of mutually nested rods, and these rods can be freely extended and retracted 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 piece 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 selected.

[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-flap core mold tooling for fiber winding as described above, specifically including: controlling the telescopic parts of the spherical split-flap core mold tooling for fiber winding to extend 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] Further, in order to illustrate the effect that can be achieved by the spherical split-flap core mold tooling for fiber winding provided by the present invention, the following actual example is used for illustration, as follows:

[0059] Example 1

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

[0061] A main shaft and a core mold half, a telescopic member connecting the main shaft and the core mold half, each core mold half independently being provided with a first telescopic member and an i-th telescopic member along the axial direction of the main shaft, i=2;

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

[0063] The guide groove comprises a first groove and a second groove which are connected to each other, and an 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] Wherein, 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 petal is a petal body obtained by dividing a spherical surface into n equal parts, where n=18.

[0068] Example 2

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

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

[0071] The core mold halves and the telescopic structure are connected via guide grooves provided on the core mold halves;

[0072] The guide groove includes a first groove and a second groove that are connected, and an angle α between the first groove and the second groove is 120°.

[0073] Wherein, the first telescopic member is connected to the main shaft through a hinge.

[0074] Wherein, the i-th telescopic member is connected to the main shaft via a sliding member, wherein the sliding member reciprocates along the axial direction of the main shaft, wherein a guide member is arranged between the sliding member and the main shaft.

[0075] Wherein, the telescopic member is telescopic along the axial direction of the telescopic member, and the telescopic member is an electric telescopic rod.

[0076] The core mold petal is a petal body obtained by dividing a spherical surface into n equal parts, where n=20.

[0077] Example 3

[0078] This embodiment provides a spherical split-petal core mold tooling for fiber winding, specifically comprising:

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

[0080] The core mold halves and the telescopic structure are connected via guide grooves provided on the core mold halves;

[0081] The guide groove includes a first groove and a second groove that are connected, and an angle α between the first groove and the second groove is 145°.

[0082] Wherein, the first telescopic member is connected to the main shaft through a hinge.

[0083] Wherein, the i-th telescopic member is connected to the main shaft via a sliding member, wherein the sliding member reciprocates along the axial direction of the main shaft, wherein a guide member is arranged between the sliding member and the main shaft.

[0084] Wherein, the telescopic member is telescopic along the axial direction of the telescopic member, and the telescopic member is a hydraulic telescopic rod.

[0085] The core mold petals are petal bodies obtained by dividing a spherical surface into n equal parts, where n=36.

[0086] Example 4

[0087] This embodiment provides a spherical split-petal core mold tooling for fiber winding, specifically comprising:

[0088] A main shaft and a core mold half, a telescopic part connecting the main shaft and the core mold half, each core mold half independently being provided with a first telescopic part, a second telescopic part, and an i-th telescopic part along the axial direction of the main shaft, i=3;

[0089] The core mold halves and the telescopic structure are connected via guide grooves provided on the core mold halves;

[0090] The guide groove comprises a first groove and a second groove which are connected to each other, and an angle α between the first groove and the second groove is 90°.

[0091] Wherein, the first telescopic member is connected to the main shaft through a hinge.

[0092] Wherein, the i-th telescopic member is connected to the main shaft via a sliding member, wherein the sliding member reciprocates along the axial direction of the main shaft, wherein a guide member is arranged between the sliding member and the main shaft.

[0093] Wherein, the telescopic member is telescopic along the axial direction of the telescopic member, and the telescopic member is an electric telescopic rod.

[0094] The core mold petals are petal bodies obtained by dividing a spherical surface into n equal parts, where n=12.

[0095] The tooling obtained by the above embodiment is used to carry out winding and molding of a spherical fiber body, as follows: the telescopic parts of the spherical split-flap core mold tooling used for fiber winding are controlled to extend so that the core mold flaps fit together, and then the fiber is wound and molded. After the molding is completed, the telescopic structure is controlled to contract so that the core mold flaps are separated from the molded fiber profile.

[0096] The tooling provided in this embodiment divides the core mold that plays a load-bearing role in the winding process into multiple petals and uses telescopic parts to ensure the overall load-bearing performance during the winding process; after the winding is completed, the telescopic parts and guide grooves are used to separate and rotate the core mold petals 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.

[0097] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0098] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0099] In addition, 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-flap core mold tooling for fiber winding comprises: A main shaft and a core mold half, a telescopic member connecting the main shaft and the core mold half, each core mold half independently being provided with a first telescopic member, a second telescopic member, ..., an i-th telescopic member along the axial direction of the main shaft, i≥2; The core mold halves and the telescopic structure are connected via guide grooves provided on the core mold halves; The guide groove comprises a first groove and a second groove which are connected, and an included angle α between the first groove and the second groove is 90°≤α<180°.

2. The spherical split-flap 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-flap 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 is movably connected to the sliding member.

4. The spherical split-flap 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-flap 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-flap 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 spherical surface into n equal parts, where n≥3.

7. The spherical split-flap core mold tooling for fiber winding according to claim 1, characterized in that: The telescopic member telescopes along the axial direction of the telescopic member.

8. The spherical split-flap core mold tooling for fiber winding according to claim 1, characterized in that: The telescopic member comprises: 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-flap core mold tooling for fiber winding as described in any one of claims 1 to 8.

10. The winding method according to claim 9, characterized in that: 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 shrink so that the core mold petals are separated from the molded fiber profile.

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