Composite material tubular product winding tool easy to demould

Abstract

The utility model discloses a composite material tubular product winding tool easy to demould, which comprises a winding unit, the winding unit is uniformly divided into a plurality of winding subunits along the circumferential direction of the winding unit, the two ends of each winding subunit are provided with inserting blocks, the outer sides of the plurality of inserting blocks are provided with hoop sleeves, the inserting blocks are provided with first fixing holes, and the hoop sleeves are provided with second fixing holes. A plurality of second fixing holes are formed in the hoop sleeve, bolts are arranged in the first fixing holes and the second fixing holes during forming, and ejector rods are arranged in the first fixing holes and the second fixing holes during demolding. According to the winding unit composed of the multiple winding subunits, the winding subunits are sequentially ejected out through the ejector rod, demolding after winding forming is completed, the demolding difficulty is low, expansion caused by heat and contraction caused by cold are not needed, and tubular products with different curing temperatures can be easily demolded; and the size of the inner surface of the tubular product can be more accurately controlled.

Description

Technical Field

[0001] This utility model relates to a winding tooling for easily demolded composite tubular products. Background Technology

[0002] Resin-based carbon fiber composites possess superior properties such as high specific strength and specific stiffness, strong design flexibility, good fatigue fracture resistance, corrosion resistance, and good dimensional stability, making them widely used high-performance structural materials in aerospace, transportation, and other fields. Carbon fiber composite tubing is one of the most widely used and numerous basic carbon fiber products and an important application form of carbon fiber composites.

[0003] Due to the excellent properties of carbon fiber composite tubes, their application demand is rapidly increasing in various fields. Currently, the common process for forming composite tubes involves winding the tubes using cylindrical tooling and then curing them at high temperatures. After curing, the tubes are demolded by using the gaps between the tooling and the product created by thermal expansion and contraction. The tubes are then cut to obtain composite tubular products of suitable dimensions.

[0004] However, using thermal expansion and contraction for demolding can lead to instability in the surface accuracy of the product's inner surface. Furthermore, the product's inner diameter is determined by the outer diameter of the tooling during resin curing. Changes in product thickness and resin type that alter the curing temperature will further change the product's inner diameter, causing the product dimensions to deviate from the design dimensions. Utility Model Content

[0005] The main purpose of this invention is to provide a winding tooling for easily demolded composite tubular products, in order to solve the problems mentioned in the background art.

[0006] The objective of this utility model can be achieved by adopting the following technical solution:

[0007] A winding fixture for easily demolded composite tubular products includes a winding unit, which is divided into multiple winding sub-units along its circumference. Each winding sub-unit has a plug-in block at both ends, and a sleeve is provided on the outer side of each plug-in block. Each plug-in block has a first fixing hole, and the sleeve has multiple second fixing holes. During molding, bolts are installed in the first and second fixing holes, and during demolding, ejector rods are installed in the first and second fixing holes.

[0008] Preferably, the winding unit is a cylindrical structure, and four winding sub-units are provided, each of which is a quarter-cylindrical structure.

[0009] Preferably, the plug-in block has a quarter-cylindrical structure, the plug-in block is coaxially arranged with the winding sub-unit, and the diameter of the plug-in block is smaller than the diameter of the winding sub-unit.

[0010] Preferably, four second fixing holes are provided, and each second fixing hole is used in conjunction with the first fixing hole of each plug block.

[0011] Preferably, the outer diameter of the hoop is equal to the diameter of the winding unit.

[0012] Preferably, the ejector rod is divided into an ejector part and a limiting part.

[0013] Preferably, the diameter of the ejector portion is equal to the diameter of the first fixing hole, and the diameter of the limiting portion is greater than the diameter of the first fixing hole.

[0014] The beneficial technical effects of this utility model are as follows:

[0015] The present invention provides a winding unit composed of multiple winding sub-units, and the winding sub-units are ejected in sequence by ejecting the ejector rod to complete the demolding after winding. The demolding is easy and does not rely on thermal expansion and contraction. It is beneficial for tubular products with different curing temperatures to be easily demolded and can more accurately control the inner surface dimensions of tubular products. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the winding tooling during demolding according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the completed assembly of the winding unit and the hoop according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the winding unit and hoop structure according to an embodiment of the present invention.

[0019] In the figure: 1. Winding unit; 2. Winding sub-unit; 3. Insertion block; 4. Hoop; 5. First fixing hole; 6. Second fixing hole; 7. Bolt; 8. Ejector rod; 801. Ejector part; 802. Limiting part; 9. Tubular product. Detailed Implementation

[0020] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0021] like Figures 1-3As shown, the easy-to-demold composite tubular product winding fixture provided in this embodiment includes a winding unit 1, which is evenly divided into multiple winding sub-units 2 along its circumference. Each winding sub-unit 2 has a connecting block 3 at both ends, and a clamp 4 is provided on the outer side of each connecting block 3 to achieve tight connection and fixation between the winding sub-units 2, while facilitating installation and disassembly, thus improving the fixture's flexibility and ease of maintenance. The connecting block 3 has a first fixing hole 5, and the clamp 4 has multiple second fixing holes 6. During molding, bolts 7 are installed in the first fixing holes 5 and second fixing holes 6. During demolding, ejector rods 8 are installed in the first fixing holes 5 and second fixing holes 6.

[0022] During the winding process, multiple winding sub-units 2 are fixed together using sleeves 4 and bolts 7 to form a complete winding unit 1. During demolding, one side of the sleeve 4 is completely removed, and then the single bolt 7 of the other side of the sleeve 4 is removed. The winding sub-unit 2 with the bolt 7 removed is ejected using the ejector rod 8. The above actions are repeated to eject multiple winding sub-units 2 in sequence to complete the demolding. This process does not rely on thermal expansion and contraction, which is beneficial for easy demolding of tubular products 9 with different curing temperatures. It also allows for more precise control of the inner surface dimensions of the tubular products 9.

[0023] The winding sub-unit 2 is made of Invar steel, resulting in low thermal expansion during the molding process. This allows for precise control of the inner surface dimensions of the tubular product 9, reducing the number of design and experimental iterations required for tooling dimensions of different models of tubular products 9, accelerating tooling design speed, and improving the production efficiency of the tubular product 9. Throughout the molding process, the tubular product 9 maintains constant contact with the tooling, which helps reduce the possibility of dust and other impurities entering the contact surface between the tubular product 9 and the tooling, thereby reducing the risk of damage to the surfaces of the tubular product 9 and the tooling due to friction.

[0024] In this embodiment, as Figure 1 As shown, the winding unit 1 is a cylindrical structure, and there are four winding sub-units 2. The winding sub-units 2 are quarter-cylindrical structures, which are easy to assemble.

[0025] In this embodiment, as Figure 1 As shown, the plug-in block 3 is a quarter-cylindrical structure. The plug-in block 3 is coaxially arranged with the winding sub-unit 2, which ensures that the parts can fit together tightly during the assembly process, improving the stability and consistency of the overall structure. The diameter of the plug-in block 3 is smaller than the diameter of the winding sub-unit 2, making it easier to insert or remove the plug-in block 3.

[0026] In this embodiment, as Figure 3 As shown, there are four second fixing holes 6. Each second fixing hole 6 is used in conjunction with the first fixing hole 5 of each plug block 3, so that each winding sub-unit 2 can be well fixed and can be smoothly ejected during demolding.

[0027] In this embodiment, as Figure 1 As shown, the outer diameter of the hoop 4 is equal to the diameter of the winding unit 1, making the structure more compact and facilitating winding and forming.

[0028] In this embodiment, as Figure 1 As shown, the ejector rod 8 is divided into an ejector part 801 and a limiting part 802. The diameter of the ejector part 801 is equal to the diameter of the first fixing hole 5, and the diameter of the limiting part 802 is greater than the diameter of the first fixing hole 5. The ejector part 801 is used to push the winding sub-unit 2 to complete demolding, while the limiting part 802 prevents the ejector rod 8 from being over-inserted.

[0029] In summary, in this embodiment, the winding unit 1, which is composed of multiple winding sub-units 2, is provided. Each winding sub-unit 2 is ejected sequentially by the ejector rod 8 to complete the demolding after winding. The demolding difficulty is low, and it does not rely on thermal expansion and contraction. This is beneficial for tubular products 9 with different curing temperatures to achieve easy demolding and allows for more precise control of the inner surface dimensions of the tubular product 9.

[0030] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A winding tooling for easily demolded composite tubular products, characterized in that: The device includes a winding unit (1), which is divided into multiple winding sub-units (2) along its circumference. Each winding sub-unit (2) has a plug-in block (3) at both ends. Each plug-in block (3) has a sleeve (4) on its outer side. Each plug-in block (3) has a first fixing hole (5) and each sleeve (4) has multiple second fixing holes (6). During molding, bolts (7) are installed in the first fixing hole (5) and the second fixing hole (6). During demolding, ejector rods (8) are installed in the first fixing hole (5) and the second fixing hole (6).

2. The easy-to-demold composite material tubular product winding tooling according to claim 1, characterized in that: The winding unit (1) is a cylindrical structure, and four winding sub-units (2) are provided. The winding sub-units (2) are quarter-cylindrical structures.

3. The easy-to-demold composite tubular product winding tooling according to claim 2, characterized in that: The plug-in block (3) is a quarter-cylindrical structure. The plug-in block (3) is coaxially arranged with the winding sub-unit (2). The diameter of the plug-in block (3) is smaller than the diameter of the winding sub-unit (2).

4. The easy-to-demold composite tubular product winding tooling according to claim 2, characterized in that: The second fixing hole (6) is provided in four parts, and each second fixing hole (6) is used in conjunction with the first fixing hole (5) of each plug block (3).

5. The easy-to-demold composite tubular product winding tooling according to claim 1, characterized in that: The outer diameter of the hoop (4) is equal to the diameter of the winding unit (1).

6. The easy-to-demold composite tubular product winding tooling according to claim 1, characterized in that: The ejector rod (8) is divided into an ejector part (801) and a limiting part (802).

7. The easy-to-demold composite material tubular product winding tooling according to claim 6, characterized in that: The diameter of the ejector part (801) is equal to the diameter of the first fixing hole (5), and the diameter of the limiting part (802) is greater than the diameter of the first fixing hole (5).

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