Winding forming method and device for fiber winding engine shell heat insulation layer

Abstract

The invention discloses a winding forming method and device for a heat insulation layer of a fiber winding engine shell. The winding forming method comprises the following steps: 1) feeding a mixed heat insulation material into an extruder to extrude a forming adhesive tape; and 2) shaping the extruded rubber belt on a conveying roller through a calendering roller, cooling the rubber sheet by a rubber sheet cooling device, cutting the rubber sheet into a rubber sheet by a rubber sheet cutting machine, and winding the rubber sheet on a winding core mold under the action of a rubber pressing roller. The bonding interface of the first-layer film and the winding core mold uses the adhesive, and other parts are formed by continuous winding without using the adhesive, so that the use amount of the adhesive is greatly reduced, the damage of a solvent in the adhesive to a human body and the environment is reduced, and the production cost is reduced; in addition, the heat-insulating rubber is continuously formed, so that the manufacturing of a roll material adhesive tape is omitted, the technological process is simplified, and the winding forming production efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of filament-wound solid rocket engine casing production, and in particular relates to a filament-wound engine casing insulation layer winding molding method and device. Background Art

[0002] The insulation material in a solid rocket engine provides insulation and thermal protection for the combustion chamber casing, preventing high-temperature, high-pressure combustion gas from reducing the casing's strength and endangering its structural integrity, thereby ensuring the engine can operate reliably; preventing the casing from reaching a temperature that threatens its structural integrity, thereby ensuring the engine can operate normally.

[0003] At present, except for the front and rear heads (the head parting generally includes the cover layer) which are formed by molding, autoclave, airbag and other molding processes, the barrel section is still manufactured mainly by manual patching. This method has high labor intensity, long process cycle, low production efficiency, and difficult to effectively control the process, which seriously restricts the production efficiency and product quality of solid rocket engines. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and to provide a method and device for winding and molding a fiber-wound engine casing insulation layer, which can improve the quality stability of the insulation layer and save costs.

[0005] To achieve the above object, the present invention provides a method for winding and molding a fiber-wound engine casing insulation layer as follows:

[0006] 1) feeding the mixed insulation material into an extruder to extrude a tape;

[0007] 2) The extruded tape is shaped by a calendering roller on a conveyor roller, cooled by a film cooling device, cut into films by a film cutting machine, and then wound onto a winding core mold under the action of a rubber pressing roller.

[0008] Furthermore, in the step 1), the thermal insulation material is heated to 60-100°C.

[0009] Furthermore, in the step 1), the outlet cross-section of the extruder is an isosceles trapezoid, and the difference between the lower base and the upper base of the isosceles trapezoid is 10 to 30 mm.

[0010] Furthermore, in the step 1), an extrusion length recorder is arranged at the outlet of the extruder.

[0011] Furthermore, in the step 2), a deflection correction device is arranged above and behind the rubber pressing roller along the conveying direction, and the film is deflected by a deflection correction sensor and a deflection correction roller before being conveyed to the winding core mold.

[0012] Furthermore, in the step 2), the winding core mold is brushed with glue by a glue brush roller, and the first layer of film is bonded to the winding core mold by adhesive; the glue brush roller is arranged on the opposite side of the starting end of the winding, and a soft roller is used, and the width of the glue brush roller is slightly larger than the width of the film; a heating device is arranged at the front end of the glue brush roller.

[0013] Furthermore, the heating device is a heating blower; the film cooling device is a blower; and the conveying roller uses constant tension conveying.

[0014] Furthermore, the roller surface of the rubber pressing roller is an elliptical concave surface, and the pressure of the rubber pressing roller is 5 to 150N.

[0015] Also provided is a device for the method of winding and forming a fiber-wound engine casing insulation layer as described above, comprising a conveying roller, an extruder arranged at the starting end of the conveying roller, a correcting roller arranged at the end of the conveying roller, an extrusion length recorder arranged at the outlet of the extruder, a glue pressing roller located at the starting end of the conveying roller and at the outlet of the extrusion length recorder, a film cooling device located at the end of the glue pressing roller, a film cutting machine and a winding core mold, a glue brushing roller for applying glue to the winding core mold, a glue pressing roller and a heating device located on the opposite side of the glue brushing roller, the heating device being arranged at the front end of the glue brushing roller, a correcting sensor being arranged between the glue pressing roller and the correcting roller, and a correcting device being arranged above the correcting sensor.

[0016] Furthermore, a rubber material collecting device is arranged directly below the rubber pressing roller.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: except for the adhesive used at the bonding interface between the first layer of film and the winding core mold of the present invention, other parts are formed by continuous winding without the need for adhesive, which greatly reduces the amount of adhesive used, reduces the damage of the solvent in the adhesive to the human body and the environment, and is also beneficial to reducing production costs; in addition, the continuous molding of the insulating rubber omits the production of the roll tape, simplifies the process flow, and improves the winding molding production efficiency; the film bevel design improves the reliability of the insulation layer after production; thereby solving the technical defects of low efficiency and low stability of manual pasting of the insulation layer, and improving the stability of the quality of the insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the shape diagram of the film of the present invention;

[0019] Figure 2 Schematic diagram of the triangular area at the starting position and the triangular area at the ending position of the thermal insulation layer winding of the present invention

[0020] Figure 3 It is a schematic diagram of the special tooling structure of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] The specific method of winding the thermal insulation layer of the fiber-wound engine casing is as follows:

[0023] 1) feeding the mixed insulation material into an extruder 1 to extrude a tape;

[0024] In order to increase the fluidity of the insulation material, heat the insulation material to 60-100°C;

[0025] In order to improve the reliability of the insulation layer after production, the outlet cross-section of the extruder is an isosceles trapezoid (such as Figure 1 As shown), a tape with overlapping grooves is produced, and the difference between the lower base and the upper base of the isosceles trapezoid is 10 to 30 mm;

[0026] The tape is produced by extrusion molding, which omits the production of coiled tape in the prior art, simplifies the process flow, improves the winding molding production efficiency, and reduces the production cost.

[0027] An extrusion length recorder 2 is arranged at the outlet of the extruder 1, which calculates the weight of the insulation layer according to the cross-sectional size, length and rubber density, and compares and counts the weight of the insulation material input into the extruder and the remaining insulation material, as well as the amount of insulation material used.

[0028] 2) The extruded tape is shaped on the conveying roller 12 by the calendering roller 3, cooled by the film cooling device 4, cut into films by the film cutting machine 5, and then wound onto the winding core mold 9 under the action of the rubber pressing roller 14;

[0029] A deflection correction device 8 is arranged above and behind the glue pressing roller 14 along the conveying direction, and the film is deflected by the deflection correction sensor 7 and the deflection correction roller 6 before being conveyed to the winding core mold 9; the deflection correction device 8 uses existing technologies such as industrial cameras, LED light sources, laser distance measuring devices and image processing to confirm the position of the film wound on the winding core mold, and feeds back to the deflection correction sensor 7 to adjust the angles of the deflection correction roller 6 and the glue pressing roller 14 to correct the film position in time. The conveying roller 12 uses constant tension for conveying to prevent deformation of the film during the transmission process;

[0030] In addition, before the film starts to be wound, the winding core mold 9 is brushed with glue by the glue brushing roller 11, and the first layer of film is bonded to the winding core mold 9 by adhesive, and no glue brushing is required later. In this embodiment, the glue brushing roller 11 is arranged on the opposite side of the starting end of the winding, and a soft roller is used. The width of the glue brushing roller 11 is slightly larger than the width of the film, which meets the initial adhesion process requirements with the front and rear head bonding interfaces and the core mold interface; at the same time, a heating device 10 is arranged at the front end of the glue brushing roller 11 to improve the insulation layer winding process efficiency and the insulation layer molding quality. In this embodiment, the heating device adopts a heating blower;

[0031] In this embodiment, the film cooling device 4 is a blower; wherein, after the film is cut by the film cutting machine 5, the film cutting requirements of the triangle area A at the starting position of the spiral winding and the triangle area B at the ending position are met, such as Figure 2 shown.

[0032] The pressure of the glue roller 14 has a direct impact on the bonding quality, appearance and density of the insulation layer. If the winding pressure is too small, the bonding quality of the insulation layer cannot be guaranteed; if the winding pressure is too large, the deformation of the tape and the insulation layer is too large, which affects the density of the insulation layer and easily damages the core mold; therefore, the pressure of the present invention is 5 to 150N, which is conducive to eliminating the gap between the tape and the winding core mold and between the tapes, thereby improving the density of the insulation layer after production.

[0033] When the thermal insulation layer is wound, a rubber pressing roller is used to wind the film onto the surface of the winding mandrel (or the thermal insulation layer). If a cylindrical pressing roller is used, the distance between the outer shape of the rubber pressing roller and the outer shape of the winding mandrel (or the thermal insulation layer) changes along the width direction of the film. Since the distance between the two is large at the edge of the film, the edge of the film is an open structure, the winding pressure is small, the bonding quality is not easy to ensure, and even the problem of warping may occur. Therefore, in order to reduce the gap between the two ends of the film and prevent the film from warping, the roller surface of the rubber pressing roller is an elliptical concave surface.

[0034] like Figure 3 The figure shows a device for winding and molding a fiber-wound engine casing insulation layer, comprising a conveying roller 12, an extruder 1 arranged at the starting end of the conveying roller 12, a correcting roller 6 arranged at the end of the conveying roller 12, an extrusion length recorder 2 arranged at the outlet of the extruder 1, a glue pressing roller 3 located at the starting end of the conveying roller 12 and at the outlet of the extrusion length recorder 2, a film cooling device 4 located at the end of the glue pressing roller 3, a film cutting machine 5 and a winding core mold 9, as well as a glue brushing roller 11 for applying glue to the winding core mold 9, a glue pressing roller 14 located on the opposite side of the glue brushing roller 11 and a heating device 10, the heating device 10 is arranged at the front end of the glue brushing roller 11, a correcting sensor 7 is arranged between the glue pressing roller 14 and the correcting roller 6, and a correcting device 8 is arranged above the correcting sensor 7, and a glue collecting device 13 is arranged directly below the glue pressing roller 14.

Claims

1. A method for winding and molding a fiber-wound engine casing insulation layer, characterized in that: The molding method shown is as follows: 1) feeding the mixed thermal insulation material into an extruder (1) to extrude a tape; 2) The extruded adhesive tape is shaped on a conveying roller (12) by a calendering roller (3), cooled by a film cooling device (4), cut into films by a film cutting machine (5), and then wound onto a winding core mold (9) under the action of a rubber pressing roller (14).

2. The method for winding and molding a fiber-wound engine casing insulation layer according to claim 1, characterized in that: In the step 1), the thermal insulation material is heated to 60-100°C.

3. The method for winding and molding a fiber-wound engine casing insulation layer according to claim 1, characterized in that: In the step 1), the outlet cross-section of the extruder (1) is an isosceles trapezoid, and the difference between the lower base and the upper base of the isosceles trapezoid is 10 to 30 mm.

4. The method for winding and molding a fiber-wound engine casing insulation layer according to claim 1, characterized in that: In the step 1), an extrusion length recorder (2) is arranged at the outlet of the extruder (1).

5. The method for winding and molding a fiber-wound engine casing insulation layer according to claim 1, characterized in that: In the step 2), a deflection correction device (8) is arranged above and behind the rubber pressing roller (14) along the conveying direction, and the film is deflected by a deflection correction sensor (7) and a deflection correction roller (6) before being conveyed to the winding core mold (9).

6. The method for winding and molding a fiber-wound engine casing insulation layer according to claim 1, characterized in that: In the step 2), the winding core mold (9) is brushed with glue by a brushing roller (11), and the first layer of film is bonded to the winding core mold (9) by an adhesive; the brushing roller (11) is arranged on the opposite side of the winding starting end, and is a soft roller, and the width of the brushing roller (11) is slightly larger than the width of the film; a heating device (10) is arranged at the front end of the brushing roller (11).

7. The method for winding and molding a fiber-wound engine casing heat insulation layer according to claim 1, characterized in that: The heating device (10) is a heating blower; the film cooling device (4) is a blower; and the conveying roller (12) is a constant tension conveyor.

8. The method for winding and molding a fiber-wound engine casing insulation layer according to claim 1, characterized in that: The roller surface of the rubber pressing roller (14) is an elliptical concave surface, and the pressure of the rubber pressing roller (14) is 5 to 150N.

9. A device for the method of winding a fiber-wound engine casing heat insulation layer as claimed in claim 1, characterized in that: The invention comprises a conveying roller (12), an extruder (1) arranged at the starting end of the conveying roller (12), a deflection correction roller (6) arranged at the end of the conveying roller (12), an extrusion length recorder (2) arranged at the outlet of the extruder (1), a glue pressing roller (3) located at the starting end of the conveying roller (12) and at the outlet of the extrusion length recorder (2), a film cooling device (4) located at the end of the glue pressing roller (3), a film cutting machine (5) and a winding core mold (9), as well as a glue brushing roller (11) for applying glue to the winding core mold (9), a glue pressing roller (14) located at the opposite side of the glue brushing roller (11) and a heating device (10), wherein the heating device (10) is arranged at the front end of the glue brushing roller (11), a deflection correction sensor (7) is arranged between the glue pressing roller (14) and the deflection correction roller (6), and a deflection correction device (8) is arranged above the deflection correction sensor (7).

10. The device according to claim 9, characterized in that: A rubber material collecting device (13) is arranged directly below the rubber pressing roller (14).

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