A retractable and deformable cloth tape winding core mold

Abstract

The present invention provides a retractable and deformable cloth tape winding core mold, comprising a core mold upper body, a core mold lower body, a sealing member and an adjustable device; the core mold upper body is inserted into the core mold lower body, and a sealing member is arranged at the contact portion between the core mold upper body and the core mold lower body; the adjustable device is arranged inside the core mold lower body, and one end of the adjustable device is connected to the small end of the core mold upper body, and the other end is connected to the large end of the core mold lower body; during operation, the cloth tape is wound from the small end to the large end of the core mold lower body to prepare a winding preform, and during the hot pressing curing process, the core mold upper body approaches the small end of the core mold lower body through the adjustable device, so that the conical surface of the core mold upper body interacts with the cloth tape wound on the surface of the core mold lower body, so as to generate pressure on the cloth tape from the small end of the core mold lower body to the inclined surface of the large end of the core mold lower body, thereby preventing the cloth tape from wrinkling. The present invention solves the problem that a large number of wrinkles appear in the diffusion section during the curing molding process, and the position and depth of the wrinkles are uncertain.

Description

Technical Field

[0001] The invention relates to a cloth tape winding core mold, in particular to a retractable and deformable cloth tape winding core mold. Background Art

[0002] As an important component of a rocket engine, the nozzle needs to have good thermal insulation, ablation resistance, and erosion resistance. The comprehensive performance of the nozzle directly determines the comprehensive performance of the rocket engine. Tape winding technology has developed into a mature manufacturing technology. At present, this technology is mainly used to manufacture the diffusion section of a rocket engine. The manufacturing process of the diffusion section of a rocket engine includes three important steps: (1) winding the tape on a pre-designed core mold; (2) heating and pressurizing the wound diffusion section in a closed pressure vessel for curing; and (3) fine-machining the cured diffusion section. Among them, the curing process of the diffusion section is very critical, and there are two main curing methods: autoclave curing and autoclave tank curing. During the autoclave curing process, the corresponding rubber sleeve will pre-wrap the wound diffusion section and seal it, and then send it into the autoclave for vacuuming, pressurizing and heating to the required temperature for curing. When using an autoclave for curing, the wrapped diffuser section will first be wrapped with adhesive felt, and then the product will be vacuumed with a vacuum sealing bag. The product will then be sent to the autoclave, the vacuum pipeline will be connected, the product will be vacuumed, and pressurized and heated for molding. During the curing process, since the fixed core mold only plays a supporting role, under strong pressure, the cloth tape wrapped around the surface of the core mold will undergo a large deformation after being subjected to forces in multiple directions, resulting in large wrinkles in the cured diffuser section.

[0003] At present, a large number of wrinkles will appear in the diffusion section prepared by tape winding during the curing process. The location and depth of the wrinkles are uncertain. After mechanical processing, fiber discontinuity will occur at the wrinkles, which will directly affect the mechanical properties of the diffusion section, and then directly affect the ablation resistance and other properties of the diffusion section. When the rocket engine is working, the location where the wrinkles are formed on the diffusion section will produce stress concentration, affecting the mechanical structure of the diffusion section and directly reducing the working time of the diffusion section.

[0004] Patent (CN 105538682 A) discloses a nozzle insulation layer winding forming tool. This patent design invents a winding forming tool suitable for different nozzle outer surface insulation layers, which is convenient for replacing damaged core molds and can serve as an internal support for the nozzle during the curing process. This patent improves the problem of replacing core molds of different sizes of diffusion sections during the winding process to a certain extent. Patent (CN 218928611 U) discloses an expansion section winding core mold. By adding an adjustment device inside the core mold, the winding specifications of the glass insulation tube can be changed, and the wound glass insulation tube can be easily demolded, thereby improving the practicality of the core mold. This patent provides a core mold for controlling the winding of glass insulation tubes of different sizes, which improves the practicality of the core mold. The above patents put forward improvement suggestions in improving the practicality of the core mold, but they do not involve the problem of wrinkles caused by uneven force on the diffusion section during the curing process.

[0005] Most of the existing diffuser core molds are fixed cones. No matter it is a male mold or a female mold, while ensuring that the outer surface or the inner surface remains unchanged, the force direction of the tape during curing cannot be changed. When the hot pressing curing pressure is too large or the pressure is not matched, the tape may slip, so it is easy to form larger, more and irregular wrinkles. After fine processing, the tape is discontinuous, resulting in a significant reduction in the performance and working time of the diffuser. Summary of the invention

[0006] The invention provides a retractable and deformable cloth tape winding core mold, which solves the problem that a large number of wrinkles appear in a diffusion section during the curing and molding process, and the positions and depths of the wrinkles are uncertain.

[0007] Based on this, the present invention provides a retractable and deformable cloth tape winding core mold, comprising a core mold upper body, a core mold lower body, a seal and an adjustable device; the core mold upper body is inserted into the core mold lower body, and a seal is arranged at the contact portion between the core mold upper body and the core mold lower body; the adjustable device is arranged inside the core mold lower body, one end of the adjustable device is connected to the small end of the core mold upper body, and the other end is connected to the large end of the core mold lower body;

[0008] During operation, the cloth tape is wound from the small end to the large end of the lower body of the core mold to prepare a wound preform. During the hot pressing and curing process, the upper body of the core mold approaches the small end of the lower body of the core mold through an adjustable device, so that the conical surface of the upper body of the core mold interacts with the cloth tape wound on the surface of the lower body of the core mold, so as to generate pressure on the cloth tape along the small end of the lower body of the core mold toward the inclined surface of the large end of the lower body of the core mold, thereby preventing the cloth tape from wrinkling.

[0009] Furthermore, the retractable and deformable cloth tape winding core mold also includes a torque control system, and the torque control system is connected to the adjustable device and is used to control the torque size of the adjustable device.

[0010] Furthermore, the adjustable device is a screw rod, a hydraulic rod, a servo motor or a cylinder telescopic device.

[0011] Furthermore, the core mold upper body and the core mold lower body are hollow structures.

[0012] Furthermore, the sealing element is made of rubber.

[0013] The above one or more technical solutions of the present invention have at least one or more of the following technical effects:

[0014] The retractable and deformable cloth tape winding core mold provided by the present invention solves the problem that a large number of wrinkles appear in the diffusion section during the curing molding process, and the position and depth of the wrinkles are uncertain. It has the advantages of simple structure, convenient operation and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 , schematic diagram of the structure of the retractable and deformable cloth tape winding core mold.

[0016] Among them, 1. the upper body of the core mold, 2. the lower body of the core mold, 3. the sealing part, and 4. the adjustable device. DETAILED DESCRIPTION

[0017] The following is a clear and complete description of the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the obtained embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0018] like Figure 1 As shown: a retractable and deformable cloth tape winding core mold, comprising a core mold upper body, a core mold lower body, a sealing member, an adjustable device and a torque control system;

[0019] The core mold upper body is inserted into the core mold lower body, and a seal is set at the contact position between the core mold upper body and the core mold lower body; the adjustable device is set inside the core mold lower body, one end of the adjustable device is connected to the small end of the core mold upper body, and the other end is connected to the large end of the core mold lower body; the torque control system is connected to the adjustable device, which is used to control the torque of the adjustable device. The adjustable device is a screw, a hydraulic rod, a servo motor or a cylinder telescopic device. The core mold upper body and the core mold lower body are hollow structures. The seal is made of rubber.

[0020] During operation, the cloth tape is wound from the small end to the large end of the lower body of the core mold to prepare a wound preform. During the hot pressing and curing process, the upper body of the core mold approaches the small end of the lower body of the core mold through an adjustable device, so that the conical surface of the upper body of the core mold interacts with the cloth tape wound on the surface of the lower body of the core mold, so as to generate pressure on the cloth tape along the small end of the lower body of the core mold toward the inclined surface of the large end of the lower body of the core mold, thereby preventing the cloth tape from wrinkling.

[0021] The working steps are:

[0022] 1) According to the manufacturing process, the prepreg tape with the required fixed width is loaded into the winding machine, the mandrel lower body 2 is loaded into the winding machine, and the product is wound according to the preset winding program, trajectory and number of winding layers;

[0023] 2) The preform after winding is removed from the winding device, and the sealing ring 3 is installed on the surface of the small end thin rod of the core mold upper body 1 to seal the gap between the core mold upper body 1 and the core mold lower body 2;

[0024] 3) Install the core mold upper body 1 according to the corresponding path, so that the small end of the core mold upper body 1 forms a certain angle with the cloth tape wrapped around the preform, and achieves greater contact with the small end of the wrapped cloth tape, which is convenient for subsequent application of pressure between the core mold upper body 1 and the core mold lower body 2;

[0025] 4) Select the intermediate fixed body 4 with appropriate torque and length according to the movable distance between the upper body 1 and the lower body 2 of the core mold, and preset the required torque between the upper and lower bodies of the core mold according to the size of the wound product and the width of the cloth tape;

[0026] 5) The intermediate fixing device 4 is connected to the torque control system 5 through a signal line, transmits the locking torque and locking distance data in real time, and executes the torque and distance instructions issued by the torque control system 5;

[0027] 6) After the wound product is covered with the adhesive felt and the sealing rubber sleeve, the core mold is placed in an autoclave or a hot press to heat and pressurize. The magnitude of the applied torque is set in the torque control system 5. During the hot pressing process, a certain force is applied to the wound product to achieve the purpose of reducing the wrinkles of the wound product.

Claims

1. A retractable and deformable cloth tape winding core mold, characterized in that: The invention comprises a core mold upper body (1), a core mold lower body (2), a sealing member (3) and an adjustable device (4); the core mold upper body (1) is inserted into the core mold lower body (2), and the sealing member (3) is arranged at the contact portion between the core mold upper body (1) and the core mold lower body (2); the adjustable device (4) is arranged inside the core mold lower body (2), and one end of the adjustable device (4) is connected to the small end of the core mold upper body (1), and the other end is connected to the large end of the core mold lower body (2); During operation, the cloth tape is wound from the small end to the large end of the core mold lower body (2) to prepare a wound preform. During the hot pressing and curing process, the core mold upper body (1) approaches the small end of the core mold lower body (2) through the adjustable device (4), so that the conical surface of the core mold upper body (1) and the cloth tape wound on the surface of the core mold lower body (2) interact with each other, so as to generate pressure on the cloth tape along the small end of the core mold lower body (2) toward the inclined surface of the large end of the core mold lower body (2), thereby preventing the cloth tape from wrinkling.

2. The retractable and deformable cloth tape winding core mold according to claim 1 is characterized in that: The retractable and deformable cloth tape winding core mold also includes a torque control system, which is connected to the adjustable device (4) and is used to control the torque size of the adjustable device (4).

3. The retractable and deformable cloth tape winding core mold according to claim 2 is characterized in that: The adjustable device (4) is a screw rod, a hydraulic rod, a servo motor or a cylinder telescopic device.

4. The retractable and deformable cloth tape winding core mold according to claim 1 is characterized in that: The core mold upper body (1) and the core mold lower body (2) are hollow structures.

5. The retractable and deformable cloth tape winding core mold according to claim 1 is characterized in that: The sealing element (3) is made of rubber.

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