CN115782225A

CN115782225A - Forming method for winding pre-buried sliding block on shell

Info

Publication number: CN115782225A
Application number: CN202211499636.6A
Authority: CN
Inventors: 魏虹; 姚桂平; 杨志超; 谭云水; 金秀秀
Original assignee: Hubei Sanjiang Space Jiangbei Mechanical Engineering Co Ltd
Current assignee: Hubei Sanjiang Space Jiangbei Mechanical Engineering Co Ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-03-14

Abstract

The invention discloses a method for forming a pre-buried slider winding shell, which comprises the steps of adhering a heat insulating layer on the surface of a core mold, winding fibers on the heat insulating layer to form a fiber layer, and then pre-curing; an inner elastic layer is pasted on the part, which is attached to the fiber layer, of the sliding block, and an outer elastic layer is pasted on the part, which is used for winding the fiber, of the sliding block; the sliding block is adhered to the fiber layer through the inner elastic layer, and then fibers are wound on the outer elastic layer; and finally, curing and demolding are carried out to obtain the winding shell with the embedded sliding block. The composite material shell is adopted to effectively reduce the passive weight and improve the strength and the comprehensive performance of the engine shell; the sliding block and the composite material shell are fixed in a bonding and sliding block winding mode, so that the sliding block is high in bearing capacity and good in fatigue resistance; the forming method is simple and the production period is short.

Description

Method for forming pre-buried slider winding shell

Technical Field

The invention belongs to the technical field of composite material forming, and particularly relates to a forming method for a pre-embedded sliding block winding shell.

Background

With the advancement of society, composite materials are used in more and more fields, especially various types of weapons. More and more types of weapons are being developed from metal shells to composite shells. The composite material, especially the carbon fiber composite material, can effectively improve the strength of the engine, reduce the negative weight and improve the comprehensive performance of the model weapon. The traditional slider for hanging and flying the airplane is a metal piece, the shell is also a metal shell, the metal shell is formed firstly, and then the slider is fixed on the metal shell in a welding mode, so that the metal shell is heavy, the welding also increases the stress of the shell, and the welding mode also easily causes the metal slider to fall off from the shell.

Disclosure of Invention

The invention aims to solve the technical defects and provides a method for forming an embedded slider winding shell, so that the embedded slider meets the airplane hanging flight requirement and the passive weight of an engine shell is effectively reduced.

In order to achieve the purpose, the invention provides a method for forming a pre-embedded sliding block winding shell, which comprises the following steps:

1) After the heat insulating layer is adhered to the surface of the core mold, fiber winding is carried out on the heat insulating layer to form a fiber layer, then pre-curing is carried out, and when the sliding block is pre-buried, the fiber layer is in a rigid state;

2) An inner elastic layer is pasted on the part, which is attached to the fiber layer, of the sliding block, and an outer elastic layer is pasted on the part, which is used for winding the fiber, of the sliding block;

3) The sliding block is adhered to the fiber layer through the inner elastic layer, and then the fiber is wound on the outer elastic layer;

4) And 3) curing and demolding are carried out after the step 3) is finished, so that the winding shell with the embedded slide block is obtained.

Further, in the step 1), the core mold is a gypsum core mold, a sand core mold or a net-size metal core mold.

Further, in the step 1), the thermal insulation layer is subjected to fiber winding to form a fiber layer, and the fiber layer is wound in a spiral winding mode and a ring winding mode, and carbon fiber or glass fiber is impregnated in epoxy resin to be subjected to wet winding or prepreg tape is used for dry winding.

Further, the specific process of step 3) is as follows: coating an adhesive on the surfaces of the inner elastic layer and the outer elastic layer, and adhering the sliding block to a preset position of the fiber layer through the inner elastic layer; and paving the prepreg on the external elastic layer according to +/-45 degrees, then winding the fibers in a ring shape, and sequentially and alternately winding the fibers in the ring shape until the fiber is wound on the outermost layer.

Further, in the step 1), the heat insulating layer is made of ethylene propylene diene monomer or nitrile rubber.

Compared with the prior art, the invention has the beneficial effects that: the sliding block for airplane hanging is embedded in the forming process of the composite material shell, the negative weight is effectively reduced by adopting the composite material shell, and the strength and the comprehensive performance of the engine shell are improved; meanwhile, the sliding block and the composite material shell are fixed in a bonding and sliding block winding mode, so that the sliding block is high in bearing capacity and good in fatigue resistance; the forming method is simple and the production period is short.

Drawings

FIG. 1 is a schematic view of the pre-buried slider of the present invention wrapped around an engine housing;

fig. 2 is a partially enlarged schematic view of fig. 1.

The heat insulation layer 1, the fiber layer 2, the inner elastic layer 3, the sliding block 4, the outer elastic layer 5 and the fiber 6.

Detailed Description

The present invention is described in further detail below by way of examples.

Referring to fig. 1 and 2, the forming process of winding the embedded slider of a certain type around the engine shell is as follows:

the diameter phi of a certain model of embedded sliding block wound on the shell of the engine is 500, the distance between the front skirt and the rear skirt of the shell is 3200mm, and 2 sliding blocks used for hanging and flying the airplane are embedded in the column section of the shell. The specific forming process is as follows:

1) After the heat insulation layer 1 is adhered to the surface of the core mold, fiber winding is carried out on the heat insulation layer 1 to form a fiber layer 2, and then pre-curing is carried out, so that the fiber layer is in a rigid state when the sliding block 4 is pre-embedded through pre-curing;

in this embodiment, the core mold is a sand core mold; adopting T800 carbon fiber to dip epoxy resin for wet winding, 6 spiral windings and 13 annular windings; the heat insulating layer is made of ethylene propylene diene monomer; the precuring system is 90 ℃/1h +120 ℃/3h;

2) An inner nitrile rubber elastic layer is pasted on the part, which is attached to the fiber layer 2, of the sliding block 4, an outer nitrile rubber elastic layer is pasted on the part, which is used for winding fibers, of the sliding block 4, and the sliding block is made of PH13-8Mo stainless steel;

3) Coating an adhesive on the surfaces of the inner nitrile rubber elastic layer and the outer nitrile rubber elastic layer, and sticking a sliding block 4 at a preset position of the fiber layer 2 through the inner elastic layer 3; laying prepreg on the external elastic layer according to +/-45 degrees, then annularly winding the fibers 6, and sequentially and alternately winding the fibers on the outermost layer until the fibers are annularly wound on the outermost layer;

4) After the step 3) is finished, curing and demolding are carried out to obtain a winding shell with the embedded sliding block, wherein the curing system is 90 ℃/1h +120 ℃/3h +150 ℃/10h; and washing the sand core mold by hot water at 90 ℃ to obtain the pre-buried slide block winding shell.

Claims

1. A method for forming a pre-buried slider winding shell is characterized by comprising the following steps: the method comprises the following steps:

1) After a heat insulating layer (1) is pasted on the surface of the core mold, fiber winding is carried out on the heat insulating layer (1) to form a fiber layer (2), and then precuring is carried out;

2) An inner elastic layer (3) is pasted on the part, which is attached to the fiber layer (2), of the sliding block (4), and an outer elastic layer (5) is pasted on the part, which is used for winding fibers, of the sliding block (4);

3) The sliding block (4) is adhered to the fiber layer (2) through the inner elastic layer (3), and then the fiber (6) is wound on the outer elastic layer (5);

2. The forming method of the embedded slider winding shell according to claim 1, characterized in that: in the step 1), the core mold is a gypsum core mold, a sand core mold or a net-size metal core mold.

3. The forming method of the embedded slider winding shell according to claim 1, characterized in that: in the step 1), the fiber winding is carried out on the heat insulation layer to form a fiber layer, and the fiber layer is wound in a spiral winding mode and a ring winding mode, and carbon fiber or glass fiber is used for impregnating epoxy resin to carry out wet winding or prepreg tape is used for dry winding.

4. The forming method of the embedded slider winding shell according to claim 1, characterized in that: the specific process of the step 3) is as follows: coating an adhesive on the surfaces of the inner elastic layer and the outer elastic layer, and adhering the sliding block to a preset position of the fiber layer through the inner elastic layer; and paving the prepreg on the external elastic layer according to +/-45 degrees, then winding the fibers in a ring shape, and sequentially and alternately winding the fibers in the ring shape until the fiber is wound on the outermost layer.

5. The forming method of the embedded slider winding shell according to claim 1, characterized in that: in the step 1), the heat insulating layer is made of ethylene propylene diene monomer or nitrile rubber.