Vertical composite winding process for prepreg tape at expansion section of oversized spray pipe

Abstract

The invention provides a vertical composite winding process for an oversized spray pipe expansion section prepreg tape, which comprises the following steps of: placing an expansion section core mold on a rotary track, rotating the expansion section core mold under the driving of a rotary driving mechanism, winding an ablation layer and a heat insulation layer by using a vertical tape winding mechanism, and then performing vacuum packaging and curing to obtain the oversized spray pipe expansion section prepreg tape. Laying the carbon fiber structure layer, performing vacuum packaging and curing, and finally demolding to form a product. According to the invention, the vertical winding forming of the prepreg tape at the expansion section of the oversized composite material spray pipe with the outlet diameter of phi 3.5 m-phi 4 m can be realized, and the problem of looseness of the heavier prepreg tape caused by traditional long-period horizontal winding is avoided; the vertical rotary curing of the expansion section of the oversized composite material spray pipe can be realized, the uniform heating of a product is ensured, the reaction rate of each part is consistent, and meanwhile, the problem that a prepreg tape slides towards the small-diameter end of a core mold due to the softening of resin in the curing and heating stage of the product is solved.

Description

technical field [0001] The invention belongs to the technical field of solid rocket motors, and in particular relates to a vertical composite winding process of prepreg cloth tapes in the expansion section of super-large nozzles. Background technique [0002] Solid rocket motors have the advantages of large thrust, simple structure, high reliability, short development cycle, and strong achievability. They have been widely used in boosters for space transportation heavy launch vehicles to meet the development needs of deep space exploration. Solid boosters account for about 81% of foreign bundled launch vehicles. Especially in the development of large and heavy launch vehicles, solid rocket motors are almost always used as the first choice for booster stages. Although my country has made some progress in large solid rocket motors, there is still a certain gap compared with the United States and Europe. [0003] The winding process can be divided into wet method and dry metho...

AI Technical Summary

Problems solved by technology

If the traditional horizontal winding is used, the product needs to be adjusted from the horizontal posture to the vertical posture after the product is prepared, and then the demoulding is performed. During the product posture adjustment process, the operation is difficult and the risk factor is high, which is very easy to cause damage to the product.

[0006] (3) For the expansion section of super-large-sized composite materials, the traditional horizontal curing process will cause the prepreg tape to slip towards the small-diameter end of the mandrel during the curing and heating stage of the product due to the softening of the resin, resulting in the inner surface of the product Polyglue line is serious, even gully appears

At the same time, during the curing process of the product, after the temperature of the resin rises and the viscosity becomes lower, the gravity will cause the side of the product near the ground to have a higher resin content, while the side farther away from the ground will have a lower resin content, resulting in low performance of the final cured product;

[0007] (4) The product adopts traditional static curing, which leads to a higher local heating rate on the side of the product near the heat source, and a lower heating rate on the part far away from the heat source, resulting in uneven distribution of the circumferential temperature field of the product and inconsistent curing reaction rates, which seriously affect resin curing. Reaction process, product quality consistency is poor

[0008] (5) The mandrel of the expansion section of the traditional composite material is made of ordinary carbon steel. The thermal expansion coefficient of the material reaches about 12×10-6m / ℃, which is quite different from the thermal expansion coefficient of the composite material body. During the curing and heating process, the mandrel is wound It is very easy to cause swelling and injury to composite nozzle products

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