CN112606380B - Method for forming thermal protection layer of spray pipe - Google Patents
Method for forming thermal protection layer of spray pipe Download PDFInfo
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- CN112606380B CN112606380B CN202011408092.9A CN202011408092A CN112606380B CN 112606380 B CN112606380 B CN 112606380B CN 202011408092 A CN202011408092 A CN 202011408092A CN 112606380 B CN112606380 B CN 112606380B
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- thermal protection
- protection layer
- spray pipe
- forming
- die
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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
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/26—Lining or sheathing of internal surfaces
- B29C63/30—Lining or sheathing of internal surfaces using sheet or web-like material
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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
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/70—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by moulding
-
- 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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
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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
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/81455—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps being a fluid inflatable bag or bladder, a diaphragm or a vacuum bag for applying isostatic pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3097—Cosmonautical vehicles; Rockets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses a method for forming a thermal protection layer of a spray pipe, wherein the spray pipe comprises a spray pipe body and the thermal protection layer and comprises the steps of sheet discharging, shearing, surface mounting and mold filling, vacuum preloading and vulcanization. By the thermal protection material patch compression molding method, the size and the appearance of the prepared thermal protection layer meet the use requirements, and the problem that the traditional short fiber reinforced phenolic resin thermal protection material press compression molding is not suitable for the molding of the thermal protection layer of the spray pipe with the complex structure is solved. Meanwhile, the vacuum box vacuum preloading shaping method is adopted, so that the thermal protection material is basically shaped before vulcanization, defects are prevented from being formed on the surface of the thermal protection layer due to local material shortage in the vulcanization process, and the apparent quality of the thermal protection layer after mould pressing is improved. Rely on the connection structure between mould body and the spray tube casing to pressurize the thermal protection layer in the forming process, consequently need not be with the help of the press, the thermal protection layer size of simultaneous control, mould simple structure, it is with low costs, realization location and drawing of patterns that can be fine, convenient operation.
Description
Technical Field
The invention relates to the technical field of manufacturing of thermal protection layers of spray pipes, in particular to a forming method of a thermal protection layer of a spray pipe.
Background
The solid rocket engine jet pipe belongs to a non-cooling structure, is the worst part in the engine for bearing the thermal environment, and needs to rely on an ablation and heat insulation structure to ensure the structural integrity, the change of an inner profile and the temperature control of an outer wall surface within a required range. Due to the complex structure form and the bad working condition, the high requirement is provided for the thermal protection, and the forming method is complex.
The traditional thermal protection layer of the spray pipe is usually formed by die pressing of short fiber reinforced phenolic resin composite materials, the forming process needs to be carried out on a press machine, and larger pressure is needed. However, due to the structural limitation of the nozzle shell, the short fiber reinforced phenolic resin thermal protection layer cannot be formed on the surface of the nozzle shell, or the forming process is complex, and the quality of the thermal protection layer cannot meet the use requirement.
Disclosure of Invention
The invention aims to provide a method for forming a thermal protection layer of a spray pipe, which is convenient to operate and good in quality of the thermal protection layer, and is suitable for forming the thermal protection layer of a structural complex part.
In order to achieve the purpose, the invention provides a method for forming a thermal protection layer of a spray pipe, wherein the spray pipe comprises a spray pipe body and the thermal protection layer, and the method comprises the following steps:
1) sheet-out and shear shape
1a) Rolling the thermal protection layer rubber material on an open mill to discharge the rubber material;
1b) placing the film into the spray pipe shell, and carrying out shearing according to the molded surface of the thermal protection layer;
2) paster die
2a) Cleaning and airing the molding surface of the mold for later use; cleaning and airing the surface of the spray pipe shell for later use;
2b) coating an adhesive on the surface of the thermal protection layer forming part of the spray pipe shell and the surface of the thermal protection layer film, and drying the adhesive;
2c) carrying out thermal protection layer film pasting on the surface of the thermal protection layer forming part of the spray pipe shell;
2d) after the surface mounting is finished, the spray pipe shell is placed into a mold;
3) vacuum preloading
Putting the integrally matched spray pipe into a vacuum drying box for vacuumizing and prepressing;
4) and (4) vulcanizing.
Further, in the step 1a), the thickness of the film is 0.1-0.3 mm thicker than the theoretical thickness of the thermal protection layer.
Further, in the step 1b), the parts which cannot be completely covered are spliced.
Further, in the step 2d), the die filling process specifically includes: firstly, the unloading module is placed into the die body, then the spray pipe shell and the die body are fixedly connected through bolts, a gap is reserved, and finally the core rod is placed into the die body.
Further, in the step 3), if the part with the material shortage is subjected to glue filling according to the shape of the material shortage position, repeating the step 2) and the step 3) until the glue material on the surface of the sprayer shell is complete, and vulcanizing after integrally assembling the mould.
Further, in the step 3a), the pre-pressing specifically comprises the following steps: pumping the pressure to-30 KPa to-50 KPa, and keeping the pressure for 30min +/-10 min.
Further, the specific vulcanization process in the step 4) is as follows:
4a) the mould is stably placed into an oven, and the temperature is raised to 80 +/-10 ℃ along with the oven, and is kept for 30-40 min;
4b) taking out the die, screwing the bolt, detecting the gap between the spray pipe shell and the die body by using a feeler gauge to ensure that the circumferential gap difference is not more than 0.1mm, and then putting the die body into an oven to continuously heat up to 140 +/-10 ℃ for 80-100 min;
4c) and after heat preservation is finished, cutting off the power, discharging the steel plate out of the furnace along with the temperature of the furnace reduced to below 60 ℃, opening the die, and cleaning the flash of the part.
Compared with the prior art, the invention has the following advantages: according to the invention, by the thermal protection material patch compression molding method, the size and the appearance of the prepared thermal protection layer meet the use requirements, and the problem that the traditional short fiber reinforced phenolic resin thermal protection material press compression molding is not suitable for the molding of the thermal protection layer of the spray pipe with a complex structure is solved. Meanwhile, the vacuum box vacuum preloading shaping method is adopted, so that the thermal protection material is basically shaped before vulcanization, defects are prevented from being formed on the surface of the thermal protection layer due to local material shortage in the vulcanization process, and the apparent quality of the thermal protection layer after mould pressing is improved. Rely on the connection structure between mould body and the spray tube casing to pressurize the thermal protection layer in the forming process, consequently need not be with the help of the press, the thermal protection layer size of simultaneous control, mould simple structure, it is with low costs, realization location and drawing of patterns that can be fine, convenient operation.
Drawings
FIG. 1 is a schematic view of a nozzle configuration;
fig. 2 is a schematic view of the mold installation.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
A method for forming a thermal protection layer of a spray pipe comprises a spray pipe body 2 and the thermal protection layer 1 as shown in figure 1, and specifically comprises the following steps:
1) sheet-out and shear shape
1a) Rolling the thermal protection layer rubber material on an open mill to obtain a film, and ensuring that the thickness of the film is 0.1-0.3 mm thicker than the theoretical thickness of the thermal protection layer; the thermal protection layer rubber material adopts ethylene propylene diene monomer material or 5-III material;
1b) and (4) placing the film into the spray pipe shell, shearing according to the molded surface of the thermal protection layer, and splicing the part which cannot be completely covered.
2) Mounting a piece and die assembling:
2a) cleaning and airing the molding surface of the mold for later use; meanwhile, the surface of the spray pipe shell is cleaned and dried for later use;
2b) coating an adhesive on the surface of the thermal protection layer forming part of the spray pipe shell and the surface of the thermal protection layer film, and drying the adhesive; the adhesive adopts Kellocko, 730 adhesive and other adhesives matched with the thermal protection layer material;
2c) carrying out thermal protection layer film pasting on the surface of the thermal protection layer forming part of the spray pipe shell;
2d) after the surface mounting is finished, the unloading module 4 is firstly placed into the die body 3, then the spray pipe shell and the die body 3 are fixedly connected through the bolt 6, a gap is reserved, and finally the core rod 5 is placed into the die body, as shown in fig. 2;
3) vacuum prepressing
3a) Putting the integrally matched spray pipe into a vacuum drying box for vacuumizing, pumping the pressure to-30 KPa to-50 KPa, maintaining the pressure for 30min +/-10 min, then taking out the spray pipe, and cleaning redundant rubber materials;
3b) if the part with the material shortage is subjected to glue filling according to the shape of the material shortage position, repeating the step 2) and the step 3) until the surface of the sprayer shell is complete in glue, and integrally assembling the sprayer shell and then vulcanizing;
by adopting a vacuum preloading method, the thermal protection material is basically shaped before vulcanization, and the apparent quality of the thermal protection layer after mould pressing is improved.
4) Vulcanization
4a) The mould is stably placed into an oven, and the temperature is raised to 80 +/-10 ℃ along with the oven, and is kept for 30-40 min;
4b) taking out the die, screwing the bolt, detecting the gap between the spray pipe shell and the die body by using a feeler gauge to ensure that the circumferential gap difference is not more than 0.1mm, and then putting the die body into an oven to continuously heat up to 140 +/-10 ℃ for 80-100 min;
4c) and after heat preservation is finished, cutting off the power, discharging the steel plate out of the furnace along with the temperature of the furnace reduced to below 60 ℃, opening the die, and cleaning the flash of the part.
The mould comprises a core rod, a mould body and a disassembling module, and is simple in structure, low in cost, convenient to operate, and capable of achieving positioning and demoulding well.
According to the invention, by the hot protective material patch compression molding method, the size and the appearance of the prepared hot protective layer meet the use requirements, and the problem that the traditional short fiber reinforced phenolic resin hot protective material press compression molding is not suitable for the molding of the hot protective layer of the spray pipe with the complex structure is solved. Meanwhile, the vacuum box vacuum preloading shaping method is adopted, so that the thermal protection material is basically shaped before vulcanization, defects are prevented from being formed on the surface of the thermal protection layer due to local material shortage in the vulcanization process, and the apparent quality of the thermal protection layer after mould pressing is improved. Rely on the connection structure between mould body and the spray tube casing to pressurize the thermal protection layer in the forming process, control the thermal protection layer size simultaneously, mould simple structure, it is with low costs, realization location and drawing of patterns that can be fine, convenient operation.
Claims (6)
1. A method for forming a thermal protection layer of a spray pipe, wherein the spray pipe comprises a spray pipe body and the thermal protection layer, and is characterized in that: the molding method comprises the following steps:
1) sheet-out and shear shape
1a) Rolling the thermal protection layer rubber material on an open mill to obtain a sheet;
1b) placing the film into the spray pipe shell, and carrying out shearing according to the molded surface of the thermal protection layer;
2) paster die
2a) Cleaning and airing the molding surface of the mold for later use; cleaning and airing the surface of the spray pipe shell for later use;
2b) coating an adhesive on the surface of the thermal protection layer forming part of the spray pipe shell and the surface of the thermal protection layer film, and drying the adhesive;
2c) carrying out thermal protection layer film pasting on the surface of the thermal protection layer forming part of the spray pipe shell;
2d) after the surface mounting is finished, the spray pipe shell is placed into a mold;
the die filling process specifically comprises the following steps: firstly, placing the unloading module into a die body, then connecting and fixing the spray pipe shell and the die body by using bolts and reserving a gap, and finally placing the core rod into the die body;
3) vacuum prepressing
Putting the integrally matched spray pipe into a vacuum drying box for vacuumizing and prepressing;
4) and (4) vulcanizing.
2. The method for forming a thermal protection layer of a nozzle according to claim 1, wherein: in the step 1a), the thickness of the film is 0.1-0.3 mm thicker than the theoretical thickness of the thermal protection layer.
3. The method for forming a thermal protection layer of a nozzle according to claim 1, wherein: in the step 1b), the parts which cannot be completely covered are spliced.
4. The method for forming a thermal protection layer of a nozzle according to claim 1, wherein: and in the step 3), if the part with the material shortage is subjected to glue filling according to the shape of the material shortage position, repeating the step 2) and the step 3) until the surface glue material of the sprayer shell is complete, and vulcanizing after integrally assembling the sprayer shell.
5. The method for forming a thermal protection layer of a nozzle according to claim 1, wherein: in the step 3), the pre-pressing specifically comprises the following steps: pumping the pressure to-30 KPa to-50 KPa, and keeping the pressure for 30min +/-10 min.
6. The method for forming a thermal protection layer of a nozzle according to claim 1, wherein: the step 4) comprises the following specific vulcanization process:
4a) the mould is stably placed into an oven, and the temperature is raised to 80 +/-10 ℃ along with the oven, and is kept for 30-40 min;
4b) taking out the die, screwing the bolt, detecting the gap between the spray pipe shell and the die body by using a feeler gauge to ensure that the circumferential gap difference is not more than 0.1mm, and then putting the die body into an oven to continuously heat up to 140 +/-10 ℃ for 80-100 min;
4c) and after heat preservation is finished, cutting off the power, discharging the steel plate out of the furnace along with the temperature of the furnace reduced to below 60 ℃, opening the die, and cleaning the flash of the part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011408092.9A CN112606380B (en) | 2020-12-03 | 2020-12-03 | Method for forming thermal protection layer of spray pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011408092.9A CN112606380B (en) | 2020-12-03 | 2020-12-03 | Method for forming thermal protection layer of spray pipe |
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| Publication Number | Publication Date |
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| CN112606380A CN112606380A (en) | 2021-04-06 |
| CN112606380B true CN112606380B (en) | 2022-07-08 |
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| CN202011408092.9A Active CN112606380B (en) | 2020-12-03 | 2020-12-03 | Method for forming thermal protection layer of spray pipe |
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| CN114670377A (en) * | 2022-04-09 | 2022-06-28 | 河北圣耐普特矿山设备有限公司 | Rubber casting pipeline vulcanization process |
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| CN102632683B (en) * | 2012-03-30 | 2014-10-29 | 湖北三江航天江北机械工程有限公司 | Manufacturing method for manual patch of heat insulating layer of filament winding engine shell |
| CN104943184B (en) * | 2015-05-15 | 2017-11-17 | 湖北三江航天江河化工科技有限公司 | A kind of heat insulation layer paster forming method |
| CN107351414A (en) * | 2016-07-08 | 2017-11-17 | 湖北航天化学技术研究所 | A kind of solid propellant rocket heat insulation layer and its forming method and crowded expanding installation |
| CN106630983A (en) * | 2016-12-23 | 2017-05-10 | 湖北三江航天江北机械工程有限公司 | Preparation method of heat protection/insulation integral antenna cover and mold thereof |
| FR3072426B1 (en) * | 2017-10-12 | 2019-11-01 | Arianegroup Sas | THERMAL PROTECTION, ITS MANUFACTURING METHOD AND DIVERGENT COMPRISING SUCH THERMAL PROTECTION |
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