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Spray pipe expansion section and forming method thereof

A molding method and expansion section technology, applied in the direction of tubular objects, other household appliances, household appliances, etc., can solve the problems of high equipment requirements and high cost, and achieve the effect of low equipment requirements, low cost, and simple method

Pending Publication Date: 2021-05-18
HUBEI SANJIANG AEROSPACE GRP HONGYANG ELECTROMECHANICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a nozzle expansion section and its forming method to solve the technical problem that the traditional winding forming method needs to be formed under high pressure, resulting in high requirements for equipment and high cost

Method used

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  • Spray pipe expansion section and forming method thereof

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Experimental program
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Effect test

Embodiment approach

[0042] As an implementation of the embodiments of the present invention, the obtaining includes a double-layer material prefabricated body sewn together by carbon cloth and fiber cloth, including:

[0043] Lay the carbon cloth layer by layer along the surface to obtain the inner layer;

[0044] Coating the fiber cloth outside the inner layer, and sewing the inner layer and the fiber cloth covered by the inner layer together with a fiber suture thread to obtain a transition layer;

[0045] Wrap the fiber cloth outside the transition layer to obtain the connecting layer;

[0046] Cover the fiber cloth outside the connecting layer, and sew the transition layer, the connecting layer and the fiber cloth wrapped outside the connecting layer together with a fiber suture thread, and perform pretreatment to obtain a carbon cloth and fiber cloth stitching Two layers of material prefabs together.

[0047]In the above covering process, a pressure of 0.1-1MPa should be applied to make th...

Embodiment 1

[0056] Embodiment 1 provides a nozzle expansion section and a forming method thereof, specifically as follows:

[0057] 1. Preparation of prefabricated body: Prefabricated body preparation steps: use carbon cloth and high silica cloth to lay layers on the molded surface in turn according to the design thickness requirements, and use fiber sutures to puncture and suture to form a double-layer material prefabricated body;

[0058] 2. Mold treatment steps: After cleaning the surface of the die, spray a layer of PMR release agent, and then keep it warm at 170°C for 2 hours;

[0059] 3. Preheating step of the prefabricated body: put the prefabricated body in step 1 into the oven heating equipment, and keep it warm for 2 hours at a temperature of 100°C;

[0060] 4. The initial mold assembly step: fill the sealing groove on the punch with a sealing rope, and connect it with the mold bottom plate as a whole;

[0061] 5. Prefabricated body suiting step: suit the prepared prefabricated...

Embodiment 2

[0069] Embodiment 2 provides a nozzle expansion section and a forming method thereof, specifically as follows:

[0070] 1. Preform preparation:

[0071] Inner layer laying step: Lay up (or wind) the carbon cloth tape layer by layer along the surface of the mold (material: wood), and the direction of the cloth tape laying (or winding) is consistent with the axis direction of the mold; laying (or winding) In the process, there must be a certain layer pressure (or winding tension) until the cloth layer is dense (the fiber volume fraction must meet the relevant requirements);

[0072] Stitching steps for transitional layer layup: Cover the surface of the carbon layer that meets the thickness requirements with a 2mm thick high-silica glass fiber cloth tape, and sew the inner layer and the transitional layer together with carbon fiber yarn. The stitching method: lock stitching, stitching needles Distance: 3*3;

[0073] The stitching steps of the connecting layer: cover the outer s...

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Abstract

The invention provides a spray pipe expansion section and a forming method thereof, and belongs to the technical field of composite material forming. The method comprises the following steps of: obtaining a double-layer material preform formed by sewing carbon cloth and fiber cloth together; placing the double-layer material preform in a mold, injecting glue, and performing curing treatment at the temperature of 50 to 170 DEG C for 6 to 10 hours; and demolding the preform subjected to curing treatmen, and obtaining the spray pipe expansion section. According to the forming method provided by the invention, high pressure does not need to act on a rubber sleeve on the outer side, so that the phenomena of layering, cracking, micro-cracks and the like which are easy to occur in the forming process of an inner-layer composite material are overcome, and the internal quality of a double-layer composite material product is greatly improved; and the method is simple, low in equipment requirement, low in cost, simple and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of composite material forming, and in particular relates to a nozzle expansion section and a forming method thereof. Background technique [0002] The shape of the expansion section of the nozzle of a subsystem of a rocket engine is a horn-shaped nozzle with a large diameter at one end and a small diameter at the other end. Gradient composite material, the traditional molding method of the composite material is to prepare phenolic prepreg cloth from carbon cloth and high silica cloth respectively, then wrap the carbon cloth impregnated with phenolic formaldehyde on the punch, and then wrap the high silica cloth impregnated with phenolic Wrapped on the outside of carbon cloth, and finally coated with high-silica cloth, placed in a hydraulic kettle, cured under high temperature, high pressure and vacuum, and finally machined to form, so as to achieve the purpose of anti-ablation of the inner layer and heat ins...

Claims

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Application Information

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IPC IPC(8): B29C70/42B29C70/54B29L23/00
CPCB29C70/42B29C70/54B29L2023/00
Inventor 李俊菊罗海涛张天胤
Owner HUBEI SANJIANG AEROSPACE GRP HONGYANG ELECTROMECHANICAL
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