A slender composite material round tube winding forming mold and use method

Abstract

The present invention discloses a slender composite material round tube winding forming mold and a use method, which provide an effective solution for the slender composite material round tube winding forming process; compared with the existing slender composite material round tube winding forming mold, the present invention is provided with a conical yarn hanging sleeve, which can effectively avoid the problem of yarn slippage at both ends when the composite material round tube is a slender tube due to the small shoulder width during winding, thereby ensuring that the winding process can be realized. In addition, compared with the existing composite material round tube winding forming mold, the present invention is provided with a cutting gap to avoid scratching the surface of the core mold when the end cap is cut off, effectively realizing the winding of the slender composite material round tube while ensuring that the core mold can be reused many times, reducing costs, and being suitable for large-scale use and promotion in industry.

Description

Technical Field

[0001] The invention belongs to the field of composite material manufacturing, and particularly relates to a slender composite material round tube winding molding die and a use method thereof. Background Art

[0002] The forming of composite material round tubes mainly adopts the roll-laying process. Typical products include antennas, fishing rods, and various structural parts. The common feature of these products is that they have a large aspect ratio and are called slender composite material round tubes.

[0003] As the performance requirements for slender composite round tubes increase, the stiffness and strength of composite round tubes made by the roll-laying process cannot meet the requirements. The main reason is that the fiber yarn tape does not apply tension during the roll-laying process, resulting in insufficient efficiency in the stiffness and strength of the fibers in the structural parts after molding.

[0004] There is a winding process in the prior art. When using this process, a core mold is required. The core mold usually includes a transition clamping section, a cylindrical section and a head. The outer diameter of the cylindrical section is generally the required value of the structural part, and the outer diameter of the transition clamping section is related to the length of the entire mold and the winding speed. Generally, it is as large as possible to allow the mold to have a higher deflection. However, this setting will result in a smaller shoulder width. According to winding principles and practices, when the shoulder width is less than 80mm, the composite yarn is prone to slippage and loosening, resulting in winding failure. For the slender composite circular tubes used for structural parts, a large portion of the products have an outer diameter size of less than 80mm. The winding of slender composite circular tubes cannot be completed using existing molds. Summary of the invention

[0005] The purpose of the present invention is to provide a slender composite material round tube winding molding mold and a method of use, so as to solve the problem that the composite material yarn is prone to slippage and loosening in the winding process in the prior art, resulting in winding failure and inability to complete the winding of the slender composite material round tube.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0007] A slender composite material round tube winding forming mold, comprising a core mold and two yarn hanging sleeves;

[0008] The middle part of the core mold is a cylindrical forming section, and both ends of the forming section are coaxially fixedly connected with cylindrical clamping sections, and the outer diameter of the clamping section is smaller than that of the forming section;

[0009] The yarn hanging sleeve includes a gap section, a transition section and a cone section. The gap section and the transition section are both annular structures. The outer diameter of the gap section is smaller than the outer diameter of the forming section, and the outer diameter of the transition section is equal to the outer diameter of the forming section. The cone section is a quasi-conical structure, and its taper gradually decreases in the direction away from the outer diameter of the transition section.

[0010] The yarn hanging sleeve is provided with a through hole along the central axis, and the diameter of the through hole matches the outer diameter of the clamping section; the two yarn hanging sleeves are detachably connected to the corresponding clamping sections respectively;

[0011] A plurality of yarn hanging holes are arranged in parallel along the circumferential direction at a position of the cone section close to the forming section, the central axes of the yarn hanging holes are perpendicular to the central axis of the core mold, and a yarn hanging nail is installed in each yarn hanging hole, which extends to the outside of the cone section.

[0012] The present invention also has the following features:

[0013] Furthermore, the through hole is provided with an internal thread, and the clamping section is provided with a matching external thread; and the two yarn hanging sleeves are respectively screwed on the corresponding clamping sections.

[0014] Furthermore, 2-4 circles of yarn hanging holes are provided on the cone section.

[0015] Furthermore, the axial length of the gap section of the hanging yarn sleeve is 2-5 mm.

[0016] Furthermore, the matching mode between the yarn hanging hole and the yarn hanging nail is clearance matching.

[0017] A method for using a slender composite material round tube winding molding die, based on the above-mentioned slender composite material round tube winding molding die, comprises the following steps:

[0018] Step 1, connecting the core mold and two yarn hanging sleeves to form a molding mold for winding a slender composite material round tube;

[0019] Step 2, the molding die is installed as a whole on an external winding machine, and the winding machine is used to drive the elongated molding die to rotate around the central axis;

[0020] Step 3, using an external winding machine nozzle to carry the composite yarn to reciprocate along the axial direction of the forming mold; allowing the composite yarn to pass through each yarn hanging nail in turn until a slender composite round tube to be processed is formed;

[0021] Among them, the external winding machine nozzle turns back at the ends of the two clamping sections of the core mold during reciprocating motion;

[0022] The speed of the external winding machine nozzle matches the rotation speed of the forming mold;

[0023] Step 4, curing the elongated composite material circular tube to be treated, and demoulding after curing, thereby completing the molding of the elongated composite material circular tube.

[0024] Furthermore, in step 4, when demoulding the elongated composite material circular tube, cutting is performed along the gap sections of the two hanging yarn sleeves respectively.

[0025] Compared with the prior art, the present invention has the following technical effects:

[0026] The slender composite material circular tube winding forming mold and the use method of the present invention provide an effective solution for the slender composite material circular tube winding forming process; compared with the existing slender composite material circular tube winding forming mold, the present invention is provided with a conical yarn hanging sleeve, which can effectively avoid the problem of yarn slippage at both ends when the composite material circular tube is a slender tube due to the small shoulder width during winding, thereby ensuring that the winding process can be realized. In addition, compared with the existing composite material circular tube winding forming mold, the present invention is provided with a cutting gap to avoid scratching the surface of the core mold when cutting off the head, effectively realizing the winding of the slender composite material circular tube while ensuring that the core mold can be reused many times, reducing costs, and being suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the winding and forming die for a slender composite material round tube of the present invention;

[0028] Figure 2 It is a schematic diagram of the core mold structure in the present invention;

[0029] Figure 3 It is a schematic diagram of the yarn hanging sleeve structure in the present invention;

[0030] Figure 4 It is a schematic diagram of the yarn hanging nail structure in the present invention;

[0031] Figure 5 The invention is a schematic diagram of the structure in which the yarn hanging nail is installed on the yarn hanging sleeve.

[0032] The meanings of the numbers in the figure are: 1. core mold; 2. yarn hanging sleeve; 3. forming section; 4. clamping section; 5. gap section; 6. transition section; 7. cone section; 8. yarn hanging hole; 9. yarn hanging nail. DETAILED DESCRIPTION

[0033] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art. For example, the yarn hanging nails are known and commonly used yarn hanging nails.

[0034] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0035] like Figures 1 to 5 As shown, a slender composite material round tube winding forming mold includes a core mold 1 and two yarn hanging sleeves 2;

[0036] The middle part of the core mold 1 is a cylindrical forming section 3, and both ends of the forming section 3 are coaxially fixedly connected with cylindrical clamping sections 4, and the outer diameter of the clamping section 4 is smaller than that of the forming section 3;

[0037] The yarn hanging sleeve 2 is provided with a through hole along the central axis, the aperture of the through hole matches the outer diameter of the clamping section 4, and the two yarn hanging sleeves 2 are detachably connected to the corresponding clamping section 4;

[0038] The yarn hanging sleeve 2 comprises a gap section 5, a transition section 6 and a cone section 7. The gap section 5 and the transition section 6 are both annular structures. The outer diameter of the gap section 5 is smaller than the outer diameter of the forming section 3, and the outer diameter of the transition section 6 is equal to the outer diameter of the forming section (3). The cone section 7 is a quasi-conical structure, and its taper gradually decreases in the direction away from the outer diameter of the transition section 6.

[0039] A plurality of yarn hanging holes 8 are arranged in parallel along the circumferential direction at a position of the cone section 7 near the forming section 3 , and the central axes of the yarn hanging holes 8 are perpendicular to the central axis of the core mold 1 . A yarn hanging nail 9 is installed in each yarn hanging hole 8 , and the yarn hanging nail 9 extends to the outside of the cone section 7 .

[0040] It should be noted that those skilled in the art are capable of determining which composite material round tube is a "slender" composite material round tube based on relevant knowledge in the field, and can use the slender composite material round tube winding molding mold provided in this embodiment to perform winding operations according to actual needs.

[0041] exist Figure 1 In the figure, the length of the core mold 1 is shown to be shorter for the convenience of demonstration. In actual work, the length of this core mold is usually longer.

[0042] Due to the existence of the gap section, a certain gap is formed between the core mold 1 and the yarn hanging sleeve 2. Specifically, the axial length of the gap section 5 of the yarn hanging sleeve 2 is 2-5 mm.

[0043] As a preferred solution, the through hole is provided with an internal thread, and the clamping section 4 is provided with a matching external thread; the two yarn hanging sleeves 2 are respectively screwed on the corresponding clamping sections 4, which facilitates disassembly and improves the connection strength.

[0044] Specifically, 2-4 rows of yarn hanging holes 8 are provided on the cone section 7. This number selection is conducive to the molding of a slender composite material round tube.

[0045] The matching mode between the yarn hanging hole 8 and the yarn hanging nail 9 is a clearance match, which is convenient for loading and unloading.

[0046] A method for using a slender composite material round tube winding molding die, based on the above-mentioned slender composite material round tube winding molding die, comprises the following steps:

[0047] Step 1, screwing a core mold 1 and two yarn hanging sleeves 2 to form a molding mold for winding a slender composite material round tube;

[0048] Step 2, placing the molding die as a whole on an external winding machine, and using the winding machine to drive the elongated molding die to rotate circumferentially along the central axis;

[0049] Step 3, using an external winding machine nozzle to carry the composite material yarn to reciprocate along the axial direction of the forming mold; allowing the composite material yarn to be wound through each yarn hanging nail 9 in sequence until a slender composite material round tube to be processed is formed;

[0050] In the reciprocating motion process, the external winding machine thread nozzle turns back at the ends of the two clamping sections 4 of the core mold 1; the movement speed of the external winding machine thread nozzle matches the rotation speed of the forming mold;

[0051] During the working process, as the winding machine nozzle moves in the opposite direction, the composite material yarn gradually slides from the top of the yarn hanging nail 9 to the root, and this reciprocating process can ensure that the composite material yarn is hung firmly.

[0052] Step 4, curing the elongated composite material circular tube to be treated, and demoulding after curing, thereby completing the molding of the elongated composite material circular tube.

[0053] It should be noted that the winding molding process is an existing process in the prior art and does not fall within the scope of discussion of this embodiment. This embodiment will no longer elaborate on the process of forming a slender composite material round tube by the cooperation of the external winding machine nozzle and the external winding machine.

[0054] Those skilled in the art are capable of adjusting the external winding machine nozzle and the working speed of the external winding machine according to relevant knowledge in the field to achieve winding and forming of the slender composite material round tube. The composite material yarn is also a commonly used device known in the prior art and will not be described in detail.

[0055] As a preferred solution, when demoulding the elongated composite material round tube, cutting is performed along the gap sections 5 of the two yarn hanging sleeves 2 respectively.

Claims

1. A slender composite material round tube winding forming mold, characterized in that: It comprises a core mold (1) and two yarn hanging sleeves (2); The middle part of the core mold (1) is a cylindrical forming section (3), and both ends of the forming section (3) are coaxially fixedly connected with cylindrical clamping sections (4), and the outer diameter of the clamping section (4) is smaller than that of the forming section (3); The yarn hanging sleeve (2) comprises a gap section (5), a transition section (6) and a cone section (7); the gap section (5) and the transition section (6) are both annular structures; the outer diameter of the gap section (5) is smaller than the outer diameter of the forming section (3); the outer diameter of the transition section (6) is equal to the outer diameter of the forming section (3); the cone section (7) is a quasi-conical structure, and its taper gradually decreases in the direction away from the outer diameter of the transition section (6); The yarn hanging sleeve (2) is provided with a through hole along the central axis, and the diameter of the through hole matches the outer diameter of the clamping section (4); the two yarn hanging sleeves (2) are respectively detachably connected to the corresponding clamping sections (4); The cone section (7) is provided with a plurality of yarn hanging holes (8) arranged in parallel along the circumferential direction at a position close to the forming section (3); the central axes of the yarn hanging holes (8) are perpendicular to the oblique cone surface of the cone section (7); a yarn hanging nail (9) is installed in each of the yarn hanging holes (8); and the yarn hanging nail (9) extends to the outside of the cone section (7).

2. The elongated composite material round tube winding forming mold according to claim 1, characterized in that: The through hole is provided with an internal thread, and the clamping section (4) is provided with a matching external thread; the two yarn hanging sleeves (2) are respectively screwed on the corresponding clamping sections (4).

3. The elongated composite material round tube winding forming mold according to claim 2, characterized in that: The cone section (7) is provided with 2-4 circles of yarn hanging holes (8).

4. The elongated composite material round tube winding forming mold according to claim 3, characterized in that: The axial length of the gap section (5) of the yarn hanging sleeve (2) is 2-5 mm.

5. The elongated composite material round tube winding forming mold according to claim 4, characterized in that: The matching mode between the yarn hanging hole (8) and the yarn hanging nail (9) is clearance matching.

6. A method for using a slender composite material round tube winding forming mold, the method is based on the slender composite material round tube winding forming mold according to claim 5, characterized in that: The following steps are involved: Step 1, connecting a core mold (1) and two yarn hanging sleeves (2) to form a molding mold for winding a slender composite material round tube; Step 2, installing the molding die as a whole on an external winding machine, and using the winding machine to drive the elongated molding die to rotate around the central axis; Step 3, using an external winding machine nozzle to carry the composite material yarn to reciprocate along the axial direction of the forming mold; allowing the composite material yarn to pass through each yarn hanging nail (9) in turn until a slender composite material round tube to be processed is formed; Wherein, the external winding machine nozzle is folded back at the ends of the two clamping sections (4) of the core mold (1) when it reciprocates; The movement speed of the external winding machine thread nozzle matches the rotation speed of the forming mold; Step 4, curing the elongated composite material circular tube to be treated, and demoulding after curing, thereby completing the molding of the elongated composite material circular tube.

7. The method for using the elongated composite material round tube winding forming mold according to claim 6, characterized in that: In step 4, when demoulding the elongated composite material circular tube, cutting is performed along the gap sections (5) of the two yarn hanging sleeves (2).

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