CN112497587A - Method for forming heat insulating layer of fiber-wound engine end socket - Google Patents
Method for forming heat insulating layer of fiber-wound engine end socket Download PDFInfo
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- CN112497587A CN112497587A CN202011167830.5A CN202011167830A CN112497587A CN 112497587 A CN112497587 A CN 112497587A CN 202011167830 A CN202011167830 A CN 202011167830A CN 112497587 A CN112497587 A CN 112497587A
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- insulating layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/002—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/007—Tempering units for temperature control of moulds or cores, e.g. comprising heat exchangers, controlled valves, temperature-controlled circuits for fluids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
- B29C2037/90—Measuring, controlling or regulating
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
The invention discloses a method for molding a heat insulating layer of a fiber-wound engine end socket, wherein a bottom layer is molded by single compression molding-integral molding, the bottom layer is placed in a molding die, then an adhesive is coated on the bottom layer and is positioned above a crack stop point, namely, an adhesive is coated on a bonding area with a cover layer and is dried, a heat insulating layer film is pasted on the adhesive coating area of the bottom layer according to the thickness and a profile of the cover layer, before pasting, the adhesive is coated on the surface of the heat insulating layer film and is dried, after the pasting of the heat insulating layer film of the cover layer is finished, the die is integrally closed, and; through with the cap coat with bond one shot integrated into one piece, can not only solve the defect that traditional axial pressor mould pressing mode can not separate artifical debonding layer root to the equator line, but also reduced mould pressing number of times and frock input, improved production efficiency, reduced manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of manufacturing of a fiber-wound engine shell heat insulation layer, and particularly relates to a method for forming a fiber-wound engine end socket heat insulation layer.
Background
The fiber wound heat insulating layer of the engine shell is a heat insulating material between the inner wall of the engine shell and the propellant grain, and consists of three parts, namely a front end socket heat insulating layer, a rear end socket heat insulating layer and a shell barrel section heat insulating layer. At present, the front and rear end sockets of the composite material shell of the domestic solid rocket engine are mostly in an integral mould pressing mode, namely, the cover layer and the bottom layer are separately moulded and formed firstly, and then the whole body is bonded.
With the starting of the new generation missile development task, the length-diameter ratio of a composite shell is increased, and in order to reduce the stress influence caused by the shrinkage of a grain as much as possible, the root separation line of the manual end socket debonding layer needs to be moved to the equator line (1.0R), but the aim is difficult to achieve by the traditional axial compression integral molding technology.
Disclosure of Invention
The invention aims to provide a method for forming a cover layer and a fiber wound engine end socket heat insulation layer integrally formed by bonding in one step, aiming at overcoming the defect that the root of an artificial debonding layer cannot be separated to an equator line in the traditional axial pressurization mould pressing mode.
In order to achieve the purpose, the forming method of the fiber winding engine head heat insulation layer comprises the following specific steps:
1) the bottom layer is molded separately
1a) Cleaning the inner surface and the outer surface of the metal joint, then airing, brushing primer on the inner surface and the outer surface of the cleaned metal joint, airing, brushing surface glue on the surface of the primer, and airing; meanwhile, brushing surface glue on the bonding surface of the heat insulation layer rubber sheet and drying the surface glue;
1b) after the heat insulation layer films are adhered to the inner surface and the outer surface of the metal joint, putting the metal joint into a forming die, and then carrying out heat insulation layer film pasting in the forming die according to the thickness and the shape of the heat insulation layer of the bottom layer of the end socket;
1c) after the surface mounting is finished, closing the die, and then putting the forming die on a flat vulcanizing machine for vulcanization;
1d) cooling the forming die to below 60 ℃ along with a flat vulcanizing machine, opening the forming die, demolding the bottom layer and cleaning burrs;
2) integral molding
2a) Polishing the area above the crack arrest point on the bottom layer, fluffing the polishing position, carrying out light inspection without reflection, and then cleaning and drying; meanwhile, adhering polytetrafluoroethylene demolding cloth on the bottom layer and in the area below the crack-stopping point;
2b) placing the bottom layer treated in the step 2a) into a forming die, and then brushing an adhesive on the bottom layer and the area above the crack-stopping point, namely the area bonded with the cover layer, and drying the adhesive;
2c) carrying out heat-insulating layer film pasting according to the thickness of the cover layer and the molded surface on the adhesive brushing area of the bottom layer, brushing an adhesive on the surface of the heat-insulating layer film before pasting, and airing;
2d) after the cover layer heat insulation layer rubber sheet is pasted, the whole die assembly is carried out, and then the forming die is placed on a flat vulcanizing machine for vulcanization;
2e) and (3) opening the forming die along with the flat vulcanizing machine when the temperature of the forming die is reduced to below 60 ℃, demolding the heat insulating layer of the end socket and cleaning the flash.
Further, in the step 1c), the specific vulcanization process is as follows: starting a vulcanizing press, performing cold pressing for 2-4 times at a gauge pressure of 3-4 MPa; heating a bottom layer forming die to 80-100 ℃, then preserving heat for 40-60 min, pressurizing to 3-5 MPa after heat preservation is finished, exhausting for 2-4 times, and finally pressurizing to 3-5 MPa; continuously heating to 110-130 ℃, and exhausting for 2-4 times; then heating to 140-160 ℃, pressurizing to 5-7 MPa, preserving heat for 60-90 min, and cooling after heat preservation.
Further, in the step 2c), the overlapping part of the heat insulating layer rubber sheet and the heat insulating layer rubber sheet is subjected to groove processing.
Further, in the step 2d), the specific vulcanization process is as follows: starting a vulcanizing press, performing cold pressing for 2-4 times at a gauge pressure of 3-4 MPa; heating the die to 80-100 ℃, then preserving heat for 40-60 min, pressurizing to 3-5 MPa after heat preservation is finished, exhausting for 2-4 times, and finally pressurizing to 3-5 MPa; continuously heating to 110-130 ℃, and exhausting for 2-4 times; then heating to 140-160 ℃, pressurizing to 5-7 MPa, and keeping the temperature for 60-90 min; and cooling after the heat preservation is finished.
Compared with the prior art, the invention has the following advantages: the cover layer and the bonding layer are integrally formed at one time, so that the defect that the root of the manual debonding layer cannot be separated to the equator line in the traditional axial pressurization die pressing mode can be overcome, the die pressing times and the tool input amount are reduced, the production efficiency is improved, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view of the insulation layer structure of a filament wound engine head according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, a method for forming a heat insulating layer of a fiber-wound engine head comprises the following specific steps:
1) the bottom layer is molded separately
1a) Cleaning the inner surface and the outer surface of the metal joint 1 by ethyl acetate, then airing, brushing primer on the inner surface and the outer surface of the cleaned metal joint, airing, brushing surface glue on the surface of the primer, and airing; meanwhile, brushing surface glue on the bonding surface of the heat insulation layer rubber sheet and drying the surface glue;
1b) after adhering heat insulating layer films to the inner surface and the outer surface of the metal joint, putting the metal joint into a forming die, and then carrying out heat insulating layer film pasting in the forming die according to the thickness and the shape of the heat insulating layer at each part of the bottom layer of the end enclosure;
1c) after the surface mounting is finished, closing the die, and then putting the forming die on a flat vulcanizing machine for vulcanization;
the specific vulcanization process is as follows: starting a vulcanizing press, performing cold pressing for 2-4 times at a gauge pressure of 3-4 MPa; heating a bottom layer forming die to 80-100 ℃, then preserving heat for 40-60 min, pressurizing to 3-5 MPa after heat preservation is finished, exhausting for 2-4 times, and finally pressurizing to 3-5 MPa; continuously heating to 110-130 ℃, and exhausting for 2-4 times; then heating to 140-160 ℃, pressurizing to 5-7 MPa, preserving heat for 60-90 min, and cutting off the power and reducing the temperature after the heat preservation is finished;
1d) the forming die is cooled to below 60 ℃ along with the flat vulcanizing machine, the forming die is opened, and the bottom layer 2 is demoulded and the flash is cleaned;
2) integral molding
2a) Polishing the region above the crack stop point 3 on the bottom layer, namely the bonding region of the cover layer 4, wherein the polishing position requires fluffing, no reflection exists in light inspection, and then cleaning and airing are carried out by using reagents such as alcohol, acetone or ethyl acetate; meanwhile, polytetrafluoroethylene demolding cloth is adhered to the area, namely the area below the crack-stopping point, on the bottom layer, namely the area of the artificial debonding layer;
2b) placing the bottom layer treated in the step 2a) into a forming die, and then brushing an adhesive on the bottom layer and the area above the crack-stopping point, namely the area bonded with the cover layer, and drying the adhesive;
2c) carrying out heat-insulating layer film pasting according to the thickness and the profile of the cover layer on the adhesive coating area of the bottom layer, coating an adhesive on the surface of the heat-insulating layer film before pasting, airing, and carrying out groove treatment on the lap joint part of the heat-insulating layer film and the heat-insulating layer film;
2d) after the cover layer heat insulation layer rubber sheet is pasted, the whole die assembly is carried out, and then the forming die is placed on a flat vulcanizing machine for vulcanization;
the specific vulcanization process is as follows: starting a vulcanizing press, performing cold pressing for 2-4 times at a gauge pressure of 3-4 MPa; heating the die to 80-100 ℃, then preserving heat for 40-60 min, pressurizing to 3-5 MPa after heat preservation is finished, exhausting for 2-4 times, and finally pressurizing to 3-5 MPa; continuously heating to 110-130 ℃, and exhausting for 2-4 times; then heating to 140-160 ℃, pressurizing to 5-7 MPa, and keeping the temperature for 60-90 min; cutting off the power and cooling after the heat preservation is finished, and keeping the temperature consistent with the bottom layer vulcanization process;
2e) and (3) opening the forming die along with the flat vulcanizing machine when the temperature of the forming die is reduced to below 60 ℃, demolding the heat insulating layer of the end socket and cleaning the flash.
The heat insulating layer film is made of ethylene propylene diene monomer material, 824 material and the like, and the adhesive is made of Kellock adhesive, 730 adhesive and the like matched with the heat insulating material.
The cover layer and the bonding layer are integrally formed at one time, so that the defect that the root of the manual debonding layer cannot be separated to the equator line in the traditional axial pressurization die pressing mode can be overcome, the die pressing times and the tool input amount are reduced, the production efficiency is improved, and the production cost is reduced.
Example 1
1) The bottom layer is molded separately
1a) Cleaning the inner surface and the outer surface of the metal joint by using ethyl acetate, then airing, coating the inner surface and the outer surface of the cleaned metal joint with Kellock 205 (primer) twice, airing, coating the surface of the primer with face glue, and airing; meanwhile, brushing a face adhesive on the bonding surface of the ethylene propylene diene monomer film and drying the face adhesive;
1b) adhering heat insulating layer films to the inner surface and the outer surface of the metal joint, placing the metal joint into a forming die, and then carrying out ethylene propylene diene monomer film pasting in the forming die according to the thickness and the shape of the heat insulating layer at each part of the bottom layer of the seal head;
1c) after the surface mounting is finished, closing the die, and then putting the forming die on a flat vulcanizing machine for vulcanization;
the specific vulcanization process is as follows: starting a vulcanizing press, and cold pressing for 3 times under the gauge pressure of 3 MPa; heating the bottom layer forming die to 80 ℃ 3, then preserving heat 403, pressurizing to 4MPa after heat preservation is finished, exhausting for 3 times, and finally pressurizing to 4 MPa; continuously heating to 115 ℃, and exhausting for 3 times; heating to 155 deg.C, pressurizing to 6MPa, maintaining for 60min, and cooling after the temperature is maintained;
1d) cooling the forming die to below 60 ℃ along with a flat vulcanizing machine, opening the forming die, demolding the bottom layer and cleaning burrs;
2) integral molding
2a) Polishing the region above the crack stop point 3 on the bottom layer, namely the bonding region of the cover layer 4, wherein the polishing position requires fluffing, no reflection exists in light inspection, and then cleaning and airing are carried out by using reagents such as alcohol, acetone or ethyl acetate; meanwhile, polytetrafluoroethylene demolding cloth is adhered to the area, namely the area below the crack-stopping point, on the bottom layer, namely the area of the artificial debonding layer;
2b) placing the bottom layer treated in the step 2a) into a forming die, and then brushing an adhesive on the bottom layer and the area above the crack-stopping point, namely the area bonded with the cover layer, and drying the adhesive;
2c) performing absolute ethylene propylene diene monomer film pasting on an adhesive coating area of the bottom layer according to the thickness and the molded surface of the cover layer, coating an adhesive on the surface of the ethylene propylene diene monomer film before pasting, drying the ethylene propylene diene monomer film in the air, and performing groove processing on the overlapped part of the ethylene propylene diene monomer film and the ethylene propylene diene monomer film;
2d) after the covering layer ethylene propylene diene monomer film is pasted, the whole die assembly is carried out, and then the forming die is placed on a flat vulcanizing machine for vulcanization;
the specific vulcanization process is as follows: starting a vulcanizing press, and cold pressing for 3 times under the gauge pressure of 3 MPa; heating the die to 80 ℃, then preserving heat for 40min, pressurizing to 4MPa after heat preservation is finished, exhausting for 3 times, and finally pressurizing to 4 MPa; continuously heating to 115 ℃, and exhausting for 3 times; then heating to 155 ℃, pressurizing to 6MPa, and keeping the temperature for 60 min; cutting off the power and cooling after the heat preservation is finished, and keeping the temperature consistent with the bottom layer vulcanization process;
2e) and (3) opening the forming die along with the flat vulcanizing machine when the temperature of the forming die is reduced to below 60 ℃, demolding the heat insulating layer of the end socket and cleaning the flash.
Claims (4)
1. A method for forming a heat insulating layer of a fiber winding engine end socket is characterized by comprising the following steps: the specific process is as follows:
1) the bottom layer is molded separately
1a) Cleaning the inner surface and the outer surface of the metal joint, then airing, brushing primer on the inner surface and the outer surface of the cleaned metal joint, airing, brushing surface glue on the surface of the primer, and airing; meanwhile, brushing surface glue on the bonding surface of the heat insulation layer rubber sheet and drying the surface glue;
1b) after the heat insulation layer films are adhered to the inner surface and the outer surface of the metal joint, putting the metal joint into a forming die, and then carrying out heat insulation layer film pasting in the forming die according to the thickness and the shape of the heat insulation layer of the bottom layer of the end socket;
1c) after the surface mounting is finished, closing the die, and then putting the forming die on a flat vulcanizing machine for vulcanization;
1d) cooling the forming die to below 60 ℃ along with a flat vulcanizing machine, opening the forming die, demolding the bottom layer and cleaning burrs;
2) integral molding
2a) Polishing the area above the crack arrest point on the bottom layer, fluffing the polishing position, carrying out light inspection without reflection, and then cleaning and drying; meanwhile, adhering polytetrafluoroethylene demolding cloth on the bottom layer and in the area below the crack-stopping point;
2b) placing the bottom layer treated in the step 2a) into a forming die, and then brushing an adhesive on the bottom layer and the area above the crack-stopping point, namely the area bonded with the cover layer, and drying the adhesive;
2c) carrying out heat-insulating layer film pasting according to the thickness of the cover layer and the molded surface on the adhesive brushing area of the bottom layer, brushing an adhesive on the surface of the heat-insulating layer film before pasting, and airing;
2d) after the cover layer heat insulation layer rubber sheet is pasted, the whole die assembly is carried out, and then the forming die is placed on a flat vulcanizing machine for vulcanization;
2e) and (3) opening the forming die along with the flat vulcanizing machine when the temperature of the forming die is reduced to below 60 ℃, demolding the heat insulating layer of the end socket and cleaning the flash.
2. The method for forming the fiber-wound engine head insulation layer according to claim 1, wherein the method comprises the following steps: in the step 1c), the specific vulcanization process is as follows: starting a vulcanizing press, performing cold pressing for 2-4 times at a gauge pressure of 3-4 MPa; heating a bottom layer forming die to 80-100 ℃, then preserving heat for 40-60 min, pressurizing to 3-5 MPa after heat preservation is finished, exhausting for 2-4 times, and finally pressurizing to 3-5 MPa; continuously heating to 110-130 ℃, and exhausting for 2-4 times; then heating to 140-160 ℃, pressurizing to 5-7 MPa, preserving heat for 60-90 min, and cooling after heat preservation.
3. The method for forming the fiber-wound engine head insulation layer according to claim 1, wherein the method comprises the following steps: and in the step 2c), groove processing is carried out on the lap joint part of the heat insulating layer rubber sheet and the heat insulating layer rubber sheet.
4. The method for forming the fiber-wound engine head insulation layer according to claim 1, wherein the method comprises the following steps: in the step 2d), the specific vulcanization process is as follows: starting a vulcanizing press, performing cold pressing for 2-4 times at a gauge pressure of 3-4 MPa; heating the die to 80-100 ℃, then preserving heat for 40-60 min, pressurizing to 3-5 MPa after heat preservation is finished, exhausting for 2-4 times, and finally pressurizing to 3-5 MPa; continuously heating to 110-130 ℃, and exhausting for 2-4 times; then heating to 140-160 ℃, pressurizing to 5-7 MPa, and keeping the temperature for 60-90 min; and cooling after the heat preservation is finished.
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| CN202011167830.5A CN112497587B (en) | 2020-10-27 | 2020-10-27 | Method for forming heat insulating layer of fiber-wound engine end socket |
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| CN113858653A (en) * | 2021-08-30 | 2021-12-31 | 湖北三江航天江北机械工程有限公司 | Method for forming fixed inverted cone heat insulation layer of rubber material |
| CN114131797A (en) * | 2021-11-05 | 2022-03-04 | 湖北三江航天江北机械工程有限公司 | Forming method and forming die for spray pipe with heat insulation layer |
| CN114131959A (en) * | 2021-11-16 | 2022-03-04 | 湖北航天技术研究院总体设计所 | Rocket engine shell front head forming method, front head and mold |
| CN114131801A (en) * | 2021-12-01 | 2022-03-04 | 湖北航天化学技术研究所 | Method for forming ellipsoidal bottom coating sleeve of solid rocket engine |
| CN114179393A (en) * | 2021-11-12 | 2022-03-15 | 湖北三江航天江北机械工程有限公司 | Fiber-wound engine end socket autoclave forming method |
| CN114179392A (en) * | 2021-11-08 | 2022-03-15 | 湖北三江航天江北机械工程有限公司 | Method for forming large-size end socket heat insulation layer |
| CN114179394A (en) * | 2021-11-23 | 2022-03-15 | 湖北三江航天江北机械工程有限公司 | Forming control method for crack stop point of heat insulation layer of solid rocket engine head |
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| CN114179392A (en) * | 2021-11-08 | 2022-03-15 | 湖北三江航天江北机械工程有限公司 | Method for forming large-size end socket heat insulation layer |
| CN114179392B (en) * | 2021-11-08 | 2024-05-07 | 湖北三江航天江北机械工程有限公司 | Forming method of large-size seal head heat insulation layer |
| CN114179393A (en) * | 2021-11-12 | 2022-03-15 | 湖北三江航天江北机械工程有限公司 | Fiber-wound engine end socket autoclave forming method |
| CN114179393B (en) * | 2021-11-12 | 2024-05-07 | 湖北三江航天江北机械工程有限公司 | Forming method of filament wound engine seal head autoclave |
| CN114131959A (en) * | 2021-11-16 | 2022-03-04 | 湖北航天技术研究院总体设计所 | Rocket engine shell front head forming method, front head and mold |
| CN114131959B (en) * | 2021-11-16 | 2023-06-20 | 湖北航天技术研究院总体设计所 | Rocket engine shell front end socket forming method, front end socket and mold |
| CN114179394A (en) * | 2021-11-23 | 2022-03-15 | 湖北三江航天江北机械工程有限公司 | Forming control method for crack stop point of heat insulation layer of solid rocket engine head |
| CN114179394B (en) * | 2021-11-23 | 2024-04-19 | 湖北三江航天江北机械工程有限公司 | Method for controlling forming of crack stop point of heat insulation layer of end socket of solid rocket engine |
| CN114131801A (en) * | 2021-12-01 | 2022-03-04 | 湖北航天化学技术研究所 | Method for forming ellipsoidal bottom coating sleeve of solid rocket engine |
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