CN115534180A - Production method of solid rocket engine heat insulation core mold coated with inner heat insulation layer - Google Patents

Production method of solid rocket engine heat insulation core mold coated with inner heat insulation layer Download PDF

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Publication number
CN115534180A
CN115534180A CN202211334939.2A CN202211334939A CN115534180A CN 115534180 A CN115534180 A CN 115534180A CN 202211334939 A CN202211334939 A CN 202211334939A CN 115534180 A CN115534180 A CN 115534180A
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China
Prior art keywords
core mold
coating
heat insulation
gypsum core
gypsum
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CN202211334939.2A
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Chinese (zh)
Inventor
郭文波
马娟
杨志超
高李帅
钟臻荣
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Hubei Sanjiang Space Jiangbei Mechanical Engineering Co Ltd
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Hubei Sanjiang Space Jiangbei Mechanical Engineering Co Ltd
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Priority to CN202211334939.2A priority Critical patent/CN115534180A/en
Publication of CN115534180A publication Critical patent/CN115534180A/en
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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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/005—Repairing damaged coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)

Abstract

The invention relates to the technical field of rocket engines, and discloses a production method of a solid rocket engine heat insulation core mold sprayed with an inner heat insulation layer. The production method of the solid rocket engine heat insulation core mold coated with the inner heat insulation layer has the advantages of high forming efficiency, simple operation, uniform forming quality and flat and defect-free surface of the formed inner heat insulation layer.

Description

Production method of solid rocket engine heat insulation core mold coated with inner heat insulation layer
Technical Field
The invention relates to the technical field of rocket engines, in particular to a method for producing a solid rocket engine heat insulation core die coated with an inner heat insulation layer.
Background
When the solid rocket engine combustion chamber shell is normally used, the internal pressure of the combustion chamber shell is 3-10 MPa or even higher and the high temperature of more than 3000K can be generated in the combustion chamber shell under normal conditions, and with the development of material science, the design of the high specific impact solid rocket engine and the use of high-energy propellant, the internal pressure and temperature of the combustion chamber shell are further improved during operation. In order to ensure the normal operation of the solid rocket engine, proper protection measures of an inner heat insulation layer need to be considered so as to prevent high temperature from directly acting on the shell of the composite material solid rocket engine, reduce the strength of the shell and endanger the structural integrity of the shell, and further influence the reliability and safety of missile flight.
The heat insulating layer in the combustion chamber of the solid rocket engine has the functions of carrying out heat protection on the shell, endowing the composite shell with air tightness, leading fuel gas into the spray pipe in a laminar flow mode as far as possible and the like. The inner heat insulating layer protects the combustion chamber shell mainly through an ablation mechanism, and the working principle of the inner heat insulating layer is that under the action of high heat flow, materials are changed in chemical and physical states and structures to generate a solid carbon layer, and further, the surface material erosion phenomenon is generated to absorb heat, so that heat energy is delayed to be conducted to the inner part and the shell. The inner heat-insulating layer usually consists of bottom coating glue, an inner heat-insulating coating and top coating glue, wherein the bottom coating glue mainly ensures the adhesion of the inner heat-insulating coating and a core mould and the later smooth demoulding; the inner heat insulation coating mainly plays a heat insulation role and is a main body material of the inner heat insulation layer; the surface coating adhesive is used for bonding the winding layer with the inner heat insulation coating and the fiber winding layer, so that the bonding strength of the first interface (the bonding interface of the inner heat insulation layer and the fiber bearing layer) is ensured. In the process of forming the composite material solid rocket motor, the core mold is used as a foundation to support the inner heat insulation layer and the fiber winding bearing layer, so that the forming quality and performance of the core mold directly influence the apparent quality of the inner heat insulation layer and the final forming quality of the composite material solid rocket motor, and the core mold generally comprises a gypsum core mold and a sand core mold.
Disclosure of Invention
The invention aims to provide a method for producing a solid rocket engine heat insulation core mold sprayed with an inner heat insulation layer, which has the advantages of high forming efficiency, simple operation, uniform forming quality and flat and defect-free surface of the inner heat insulation layer after forming, and overcomes the defects of the prior art.
In order to achieve the purpose, the production method of the heat insulation core mold of the solid rocket engine sprayed with the inner heat insulation layer sequentially comprises core mold framework assembly, gypsum core mold forming and gypsum core mold adding, and further comprises gypsum core mold surface repairing, gypsum core mold surface treatment agent coating, heat insulation coating in the heat insulation core mold surface, heat insulation core mold surface repairing and surface gluing coating, wherein the gypsum core mold surface repairing means that after the gypsum core mold adding is finished, the surface of the gypsum core mold is trimmed by using a putty powder and curing agent mixture to enable the surface of the gypsum core mold to be smooth and free of holes; the surface treatment of the gypsum core mold is to stick a layer of polytetrafluoroethylene glass fiber adhesive tape on the surface of the repaired gypsum core mold; the coating of the gypsum core mold surface treating agent refers to that a spraying device is used for uniformly spraying a primer on the surface of the gypsum core mold to form a heat insulation core mold; coating the heat insulation coating in the surface of the heat insulation core mold refers to preparing an inner heat insulation coating paint, uniformly coating the inner heat insulation coating paint on the surface of the heat insulation core mold by adopting a reciprocating automatic spraying machine, and curing in a natural state after spraying; the surface repairing of the heat insulation core mold refers to finishing the area with defects or thickness not meeting the requirements on the surface of the heat insulation core mold after the coating of the inner heat insulation coating is finished, wherein the surface coating refers to coating surface and coating, and then fiber winding of a bearing layer is carried out within preset time.
Preferably, in the process of coating the surface treatment agent for the gypsum core mold, if the surface of the gypsum core mold has a defect or a spray-leaking position after the spraying is finished, the surface treatment agent can be cleaned and then subjected to additional spraying, so that no spray-leaking position exists on the surface.
Preferably, during the process of coating the inner heat-insulating coating on the surface of the heat-insulating core mould, a needle-punching thickness gauge is used for measuring the thickness of the inner heat-insulating coating, so as to ensure that the thickness of the inner heat-insulating coating meets the requirement.
Preferably, the surface repair of the gypsum core mold comprises the following steps:
a1 Hoisting the qualified gypsum core mold after the machine feeding is finished on a support frame;
a2 Using a putty knife to dig pits and layering defects on the surface of the gypsum core mould to the root parts of the pits;
a3 Preparing a mixture of putty powder and a curing agent according to the proportion of 5-20 percent of the curing agent, filling the dug pits in layers, and keeping the height of the filled area consistent with that of the unfilled area;
a4 Air-drying the pit and the layering defect in a natural state after the repair, wherein the air-drying time is more than or equal to 4 hours, and the subsequent working procedures can be carried out;
a5 The surface of the repaired gypsum core model is polished by using 800-mesh sand paper or a pneumatic polisher, the surface of the gypsum core model is smoothly transited after polishing, and pits with the depth of more than 0.2-0.4 mm and the diameter of more than 2-4 mm and bulges with the diameter of 0.2-0.4 mm higher than the surface do not exist on the surface.
Preferably, the putty powder and curing agent mixture needs to be used within 1-2 hours.
Preferably, the gypsum core mold surface treatment comprises the following steps:
b1 Cleaning up dust on the surface of the gypsum core mold by using non-woollen paper or clean cotton cloth, and then cutting the polytetrafluoroethylene glass fiber adhesive tape according to the molded surface of the end socket;
b2 The cut polytetrafluoroethylene glass fiber adhesive tape is adhered to the front and rear end sockets and the gypsum core mold corresponding to the cylinder section according to the corresponding relationship of the molded surfaces, and the polytetrafluoroethylene glass fiber adhesive tape is compacted once again from front to back by hands after the adhesion is finished, so that the polytetrafluoroethylene glass fiber adhesive tape is ensured to be firmly adhered to the gypsum core mold.
Preferably, the gypsum core mold surface treatment agent coating comprises the steps of:
c1 Hoisting a gypsum core mold, assembling the prefabricated front and rear end sockets on the core mold from two ends of the gypsum core mold, assembling the compression nuts of the front and rear end sockets, placing the hoisted gypsum core mold on a support frame, screwing the compression nuts of the front and rear end sockets tightly, and fixing the prefabricated front and rear end sockets;
c2 Hoisting the gypsum core mold with the prefabricated end socket assembly onto spraying equipment, and fixing two ends of the gypsum core mold by using a chuck;
c3 Clean compressed air is used for removing dust on the surface of the gypsum core mould, and then clean hairless paper is dipped in ethyl acetate to repeatedly scrub the surface of the core mould until the clean hairless paper is scrubbed without pollution;
c4 ) weighing the surface treating agent, and mixing the surface treating agent 1000: the mass ratio of 120# solvent gasoline is 1:1 preparing base coating glue, spraying the base coating glue on the surface of a gypsum core mould by using spraying equipment after preparation is finished, wherein the surface of the gypsum core mould is required to be completely coated with the base coating glue, airing the gypsum core mould in a preset temperature and humidity range after spraying is finished, and then performing appearance inspection to ensure that the surface is flat and free of accumulation to form the heat insulation core mould.
Preferably, the application of the insulating coating in the insulating core surface comprises the following steps:
d1 Cleaning the spray-on tool with ethyl acetate;
d2 Cleaning the reciprocating automatic spraying machine by using No. 120 gasoline and testing the reciprocating automatic spraying machine;
d3 Weighing the internal thermal insulation coating, and mixing the internal thermal insulation coating: the mass ratio of 120# gasoline is 1:1 preparing the internal heat insulation coating, fully stirring for 20-30 minutes until no block exists;
d4 Coating the inner heat-insulating coating by using a reciprocating automatic spraying machine, airing at room temperature for more than 10 minutes after each spraying, and repeatedly coating the inner heat-insulating coating until the thickness of the inner heat-insulating coating meets the requirement;
d5 ) after the spraying is finished, naturally curing, wherein the curing is subject to the condition that the Shore A hardness of the coating reaches more than 70.
Preferably, the surface repair of the insulation core mold comprises the steps of:
e1 Carrying out coarse grinding on the internal heat-insulating coating and the defective part by using 200-300-mesh abrasive paper, and carrying out fine grinding on the internal heat-insulating coating and the defective part by using 800-mesh abrasive paper;
e2 The inner heat insulation coating pits and the parts with smaller outer diameters are polished by 800-mesh abrasive paper, then the pits and the parts with smaller outer diameters are repaired to be qualified by adopting a manual spraying mode, the protruding parts are polished to be flat, the axial protruding height of the inner heat insulation coating surface is required to be less than or equal to 1mm after repairing, the annular protruding height of the inner heat insulation coating is required to be less than or equal to 0.8mm, and the surface does not have peeling and wrinkles.
Preferably, the top-coating comprises the following steps:
f1 Hoisting the repaired heat insulation core mold on a winding machine, and clamping the core mold by using a chuck;
f2 Dipping ethyl acetate by using hairless paper to wipe the surface of the thermal insulation coating in the thermal insulation core mold once, airing for 10-20 min, airing the surface of the inner thermal insulation coating, and then bonding and sealing the front joint wire retaining ring and the tool by using a polytetrafluoroethylene glass fiber adhesive tape to prevent resin glue from permeating into a threaded hole and a mounting surface;
f3 H) to 2 Stirring the surface coating glue by using a stirrer to wrap the bottom of the container for 3-5 min, uniformly stirring, scraping the surface coating glue gathered at the edge and the bottom of the container by using a glass rod, stirring for 2-6 min by using the glass rod, and fully and uniformly stirring the surface coating glue;
f4 Patting and brushing the hairbrush to clean weak viscose fiber hairs on the surface of the hairbrush, and binding the fixed part of the hairbrush by using a transparent adhesive tape to avoid the falling of a screw;
f5 Using a brush to manually and uniformly coat the prepared H2 surface coating on the whole surface of the inner heat-insulating coating without leaking brushing, wherein an operator needs to wear clean rubber gloves during the process of brushing the coating;
f6 H2 surface coating glue is coated and brushed, then the surface is aired and placed without reflection, and then the bearing layer is wound by fiber within 60-180 min.
Compared with the prior art, the invention has the following advantages:
1. the molding efficiency is high, the operation is simple, the molding quality is uniform, and the surface of the heat insulating layer after molding is flat and free of defects;
2. the inner heat insulation layer which has low defect, lower density, ablation resistance, scouring resistance and certain strength and can form good bonding performance with the composite bearing layer of the solid rocket engine shell is formed on the inner surface of the composite solid rocket engine by adopting a spray forming mode.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
A method for producing a solid rocket engine heat insulation core mold coated with an inner heat insulation layer comprises the following steps:
1. preparing: hemp rope, gypsum, portland cement, retarder, putty powder, bottom glue, inner heat insulation layer coating, surface glue and polytetrafluoroethylene glass fiber adhesive tape; a self-designed gypsum core model framework, a scraper and a Richter hardness tester KHL180; all systems of the equipment operate normally, and the whole spraying process needs to ensure that the environmental temperature is 25 +/-10 ℃ and the relative humidity is less than or equal to 75 percent.
2. Checking and cleaning the tool and the parts: visually checking that the surface of the core mould framework part has no obvious defects such as collision damage, burrs, cracks and the like; measuring the surface hardness of the end socket cladding plate by adopting metal hardness, wherein the average hardness is required to be more than or equal to 250HL; the surfaces of the parts are not allowed to have foreign matters such as discontinuous hemp ropes, gypsum blocks, putty blocks and the like.
3. Core mold framework assembly
Winding a continuous hemp rope on the spherical surfaces of the bearing bushes of the front and rear end enclosures;
placing the mandrel on a support frame;
assembling three mandrel framework parts on the mandrel according to the sequence of the positioning shaft sleeve, the rigid support and the partition plate assembly, and fastening the partition plate assembly with the positioning shaft sleeve of the mandrel and the rigid support by using screws in the assembling process;
connecting a support rod and a gasket with the partition plate assembly by taking the mandrel front end socket key block as a reference, and then fastening by using a screw;
connecting the front seal head assembly with the front seal head positioning sleeve and the rigid support corresponding to the front seal head, and fastening by using screws;
connecting the rear seal head assembly with a rear seal head positioning sleeve, and fastening the joint of the partition plate assembly and the core shaft by using a screw;
positioning by using a rear seal head positioning sleeve, and connecting and fastening a rear tuyere base plate and a rear seal head assembly by using screws;
filling gaps between the front end enclosure assembly and the rear end enclosure assembly by using hemp ropes, preparing putty powder according to the proportion of 5-20% of a curing agent, filling the surfaces of the gaps of the assemblies by using the prepared putty powder, and ensuring that no gap exists between the putty powder and the hemp ropes on the lower layer;
and assembling the front and rear end socket cladding plates and the outer circle cladding plate to corresponding positions, and then connecting and fastening by using screws.
4. Gypsum core mould forming
Hoisting the assembled core mold framework on a gypsum core mold forming machine;
adjusting the rotating speed of a gypsum core mold forming machine, setting the rotating speed to be 5-10 r/min, rotating a core mold framework, winding a hemp rope while rotating, wherein the winding tension of the hemp rope is 10-20N/strand, winding with tension to cover the whole cylinder section area from a front equator line to a rear equator line, and then infiltrating the surface of the hemp rope by using a self-made treating agent;
assembling a self-made scraper on a scraper feeding device, enabling the scraper to face upwards, adjusting the distance between the scraper and a core mold to a proper position through the feeding device, and running and winding the core mold to ensure that the scraper is interfered with a front base plate and a rear base plate;
according to the proportion of gypsum: cement: retarder =2:1: 0-0.002 (mass ratio) of gypsum plaster mixed slurry, pouring the uniformly mixed gypsum plaster mixed slurry into a mortar spraying machine, starting the mortar spraying machine, controlling the water feeding rate to be 300-1000L/h, uniformly coating the mixture of the gypsum plaster mixed slurry and water on the surface of the core mold framework from the front end socket of the core mold, and pulling away a scraper after the scraper scrapes out a complete molded surface on the core mold framework;
and transferring the scraped gypsum core mold to a curing furnace, setting the temperature to be 50 +/-5 ℃, drying for 30-50h, cooling after drying, and discharging at room temperature.
5. Gypsum core die machine
And hoisting the gypsum core mold after the cooling after the solidification to a lathe, and lathing according to a certain profile and size.
6. Plaster core mould surface repair
A1 Hoisting the qualified gypsum core mold after the machine feeding is finished on a support frame;
a2 Using a putty knife to dig pits and layering defects on the surface of the gypsum core mould to the root of the pits;
a3 Preparing a mixture of putty powder and a curing agent according to the proportion of 5-20 percent of the curing agent, filling the dug pits in layers, keeping the height of the filled area consistent with that of the unfilled area, and using the mixture of the putty powder and the curing agent within 1-2 hours;
a4 Air-drying the pit and the layering defect in a natural state after the repair, wherein the air-drying time is more than or equal to 4 hours, and the subsequent working procedures can be carried out;
a5 The surface of the repaired gypsum core model is polished by using 800-mesh sand paper or a pneumatic polisher, the surface of the gypsum core model is smoothly transited after polishing, and pits with the depth of more than 0.2-0.4 mm and the diameter of more than 2-4 mm and bulges with the diameter of 0.2-0.4 mm higher than the surface do not exist on the surface.
7. Surface treatment of gypsum core mould
B1 Cleaning the floating dust on the surface of the gypsum core mold by using non-woollen paper or clean cotton cloth, and then cutting the polytetrafluoroethylene glass fiber adhesive tape according to the molding surface of the end socket;
b2 The cut polytetrafluoroethylene glass fiber adhesive tape is adhered to the front and rear end sockets and the gypsum core mold corresponding to the cylinder section according to the corresponding relationship of the molded surfaces, and the polytetrafluoroethylene glass fiber adhesive tape is compacted once again from front to back by hands after the adhesion is finished, so that the polytetrafluoroethylene glass fiber adhesive tape is ensured to be firmly adhered to the gypsum core mold.
8. Coating of gypsum core mould surface treatment agent
C1 Hoisting a gypsum core mold, assembling the prefabricated front and rear end sockets on the core mold from two ends of the gypsum core mold, assembling the compression nuts of the front and rear end sockets, placing the hoisted gypsum core mold on a support frame, screwing the compression nuts of the front and rear end sockets tightly, and fixing the prefabricated front and rear end sockets;
c2 Hoisting the gypsum core mold with the prefabricated end socket assembly onto spraying equipment, and fixing two ends of the gypsum core mold by using a chuck;
c3 Clean compressed air is used for removing dust on the surface of the gypsum core mould, and then clean hairless paper is dipped in ethyl acetate to repeatedly scrub the surface of the core mould until the clean hairless paper is scrubbed without pollution;
c4 Weighing the surface treating agent according to the weight ratio of the surface treating agent 1000: the mass ratio of 120# solvent gasoline is 1:1 preparing base coating glue, spraying the base coating glue on the surface of a gypsum core mould by using spraying equipment after preparation is finished, wherein the surface of the gypsum core mould is required to be completely coated with the base coating glue, airing the gypsum core mould in a preset temperature and humidity range after spraying is finished, and then performing appearance inspection to ensure that the surface is flat and free of accumulation to form the heat insulation core mould.
In addition, in the process of coating the surface treatment agent for the gypsum core mold, if defects or spraying missing positions exist on the surface of the gypsum core mold after the coating is finished, the surface treatment agent can be cleaned and then sprayed again, so that the surface is ensured to have no spraying missing positions.
9. Coating of heat insulating coating in surface of heat insulating core mold
D1 Cleaning the spray coating implement with ethyl acetate;
d2 Cleaning the reciprocating automatic spraying machine by using No. 120 gasoline and testing the reciprocating automatic spraying machine;
d3 Weighing the inner heat-insulating coating according to the following weight percentage: the mass ratio of 120# gasoline is 1:1 preparing the internal heat insulation coating, fully stirring for 20-30 minutes until no block exists;
d4 Coating the inner heat-insulating coating by using a reciprocating automatic spraying machine, airing at room temperature for more than 10 minutes after each spraying, and repeatedly coating the inner heat-insulating coating until the thickness of the inner heat-insulating coating meets the requirement;
d5 ) after the spraying is finished, naturally curing, wherein the curing is subject to the condition that the Shore A hardness of the coating reaches more than 70.
In the process of coating the inner heat insulation coating on the surface of the heat insulation core mold, a needle-punching thickness gauge is used for measuring the thickness of the inner heat insulation coating, so that the thickness of the inner heat insulation coating can meet the requirement.
10. Surface repair of heat insulation core mold
E1 Carrying out coarse grinding on the internal heat-insulating coating and the defective part by using 200-300-mesh abrasive paper, and carrying out fine grinding on the internal heat-insulating coating and the defective part by using 800-mesh abrasive paper;
e2 The inner heat insulation coating pits and the parts with smaller outer diameters are polished by 800-mesh abrasive paper, then the pits and the parts with smaller outer diameters are repaired to be qualified by adopting a manual spraying mode, the protruding parts are polished to be flat, the axial protruding height of the inner heat insulation coating surface is required to be less than or equal to 1mm after repairing, the annular protruding height of the inner heat insulation coating is required to be less than or equal to 0.8mm, and the surface does not have peeling and wrinkles.
11. Surface coating with glue
F1 Hoisting the repaired heat insulation core die on a winding machine, and clamping the core die by using a chuck;
f2 Dipping ethyl acetate by using hairless paper to wipe the surface of the thermal insulation coating in the thermal insulation core mold once, airing for 10-20 min, airing the surface of the inner thermal insulation coating, and then bonding and sealing the front joint wire retaining ring and the tool by using a polytetrafluoroethylene glass fiber adhesive tape to prevent resin glue from permeating into a threaded hole and a mounting surface;
f3 H) is mixed with 2 Stirring the surface coating glue by using a stirrer to wrap the bottom of the container for 3-5 min, uniformly stirring, scraping the surface coating glue gathered at the edge and the bottom of the container by using a glass rod, stirring for 2-6 min by using the glass rod, and fully and uniformly stirring the surface coating glue;
f4 Patting and brushing the hairbrush to clean weak viscose fiber hairs on the surface of the hairbrush, and binding the fixed part of the hairbrush by using a transparent adhesive tape to avoid the falling of screws;
f5 Using a brush to manually and uniformly coat the prepared H2 surface coating on the whole surface of the inner heat-insulating coating without leaking brushing, wherein an operator needs to wear clean rubber gloves during the process of brushing the coating;
f6 H2 surface coating glue is coated and brushed, then the surface is aired to have no reflection, and then the bearing layer is wound by fibers within 60-180 min.

Claims (10)

1. A method for producing a solid rocket engine heat insulation core mold coated with an inner heat insulation layer sequentially comprises core mold framework assembly, gypsum core mold forming and gypsum core mold machining, and is characterized in that: the method also comprises the steps of gypsum core mold surface repairing, gypsum core mold surface treatment agent coating, thermal insulation coating in the surface of the thermal insulation core mold, thermal insulation core mold surface repairing and surface gluing coating, wherein the gypsum core mold surface repairing refers to the step of finishing the surface of the gypsum core mold by using a putty powder and curing agent mixture after the gypsum core mold is machined, so that the surface of the gypsum core mold is smooth and has no holes; the surface treatment of the gypsum core mold is to stick a layer of polytetrafluoroethylene glass fiber adhesive tape on the surface of the repaired gypsum core mold; the coating of the gypsum core mold surface treating agent refers to that a spraying device is used for uniformly spraying a primer on the surface of the gypsum core mold to form a heat insulation core mold; coating the heat insulation coating in the surface of the heat insulation core mold refers to preparing an inner heat insulation coating paint, uniformly coating the inner heat insulation coating paint on the surface of the heat insulation core mold by adopting a reciprocating automatic spraying machine, and curing in a natural state after spraying; the surface repairing of the heat insulation core mold refers to finishing an area with defects or thickness not meeting requirements on the surface of the heat insulation core mold after the coating of the inner heat insulation coating is finished, and the surface gluing coating refers to coating surface gluing and then carrying out fiber winding of the bearing layer in preset time.
2. The method of producing a solid rocket motor insulating core mold coated with an inner insulating layer as claimed in claim 1, wherein: in the process of coating the surface treating agent for the gypsum core mold, if the surface of the gypsum core mold has a defect or a spray leaking position after the coating is finished, the surface treating agent can be cleaned and then subjected to secondary spraying, so that the surface is ensured to have no spray leaking position.
3. The method of producing a solid rocket motor insulating core mold coated with an inner insulating layer as claimed in claim 1, wherein: in the coating process of the inner heat insulation coating on the surface of the heat insulation core mold, the thickness of the inner heat insulation coating is measured by using a needle-punching thickness gauge, so that the thickness of the inner heat insulation coating can meet the requirement.
4. The method of producing a solid rocket motor insulating core mold coated with an inner insulating layer as claimed in claim 1, wherein: the surface repairing of the gypsum core mold comprises the following steps:
a1 Hoisting the qualified gypsum core mold after the machine feeding is finished on a support frame;
a2) Digging pits and layering defects on the surface of the gypsum core mold to the root parts of the pits by using a putty knife;
a3) Preparing a mixture of putty powder and a curing agent according to the proportion of 5-20% of the curing agent, filling the dug pits in a layered manner, and keeping the height of a filled area consistent with that of a non-filled area;
a4) After repairing the pits and the layering defects, airing the pits and the layering defects in a natural state, wherein the airing time is more than or equal to 4 hours, and carrying out the next procedure;
a5) And (3) polishing the surface of the repaired gypsum core mold by using 800-mesh sand paper or a pneumatic polisher, and enabling the surface of the gypsum core mold to be in smooth transition after polishing, wherein the surface does not have pits with the depth of more than 0.2-0.4 mm and the diameter of more than 2-4 mm and bulges with the depth of 0.2-0.4 mm higher than the surface.
5. The method of producing a solid rocket motor insulating core mold coated with an inner insulating layer as claimed in claim 4, wherein: the mixture of the putty powder and the curing agent needs to be used within 1 to 2 hours.
6. The method of producing a solid rocket motor insulating core mold coated with an inner insulating layer as claimed in claim 1, wherein: the surface treatment of the gypsum core mold comprises the following steps:
b1 Cleaning up dust on the surface of the gypsum core mold by using non-woollen paper or clean cotton cloth, and then cutting the polytetrafluoroethylene glass fiber adhesive tape according to the molded surface of the end socket;
b2 The cut polytetrafluoroethylene glass fiber adhesive tape is adhered to the front and rear end sockets and the gypsum core mold corresponding to the cylinder section according to the corresponding relationship of the molded surfaces, and the polytetrafluoroethylene glass fiber adhesive tape is compacted once again from front to back by hands after the adhesion is finished, so that the polytetrafluoroethylene glass fiber adhesive tape is ensured to be firmly adhered to the gypsum core mold.
7. The method of producing a solid rocket motor insulating core mold coated with an inner insulating layer as claimed in claim 1, wherein: the coating of the gypsum core mold surface treating agent comprises the following steps:
c1 Hoisting a gypsum core mold, assembling the prefabricated front and rear end sockets on the core mold from two ends of the gypsum core mold, assembling the compression nuts of the front and rear end sockets, placing the hoisted gypsum core mold on a support frame, screwing the compression nuts of the front and rear end sockets tightly, and fixing the prefabricated front and rear end sockets;
c2 Hoisting the gypsum core mold with the prefabricated end socket assembly onto spraying equipment, and fixing two ends of the gypsum core mold by using a chuck;
c3 Clean compressed air is used for removing dust on the surface of the gypsum core mould, and then clean hairless paper is dipped in ethyl acetate to repeatedly scrub the surface of the core mould until the clean hairless paper is scrubbed without pollution;
c4 Weighing the surface treating agent according to the weight ratio of the surface treating agent 1000: the mass ratio of 120# solvent gasoline is 1:1 preparing base coating glue, spraying the base coating glue on the surface of a gypsum core mould by using spraying equipment after preparation is finished, wherein the surface of the gypsum core mould is required to be completely coated with the base coating glue, airing the gypsum core mould in a preset temperature and humidity range after spraying is finished, and then performing appearance inspection to ensure that the surface is flat and free of accumulation to form the heat insulation core mould.
8. The method of producing a solid rocket motor insulating core mold coated with an inner insulating layer as claimed in claim 1, wherein: the coating of the heat insulation coating in the surface of the heat insulation core die comprises the following steps:
d1 Cleaning the spray coating implement with ethyl acetate;
d2 Cleaning the reciprocating automatic spraying machine by using No. 120 gasoline and testing the reciprocating automatic spraying machine;
d3 Weighing the internal thermal insulation coating, and mixing the internal thermal insulation coating: the mass ratio of 120# gasoline is 1:1 preparing the internal heat insulation coating, fully stirring for 20-30 minutes until no block exists;
d4 Coating the inner heat-insulating coating by using a reciprocating automatic spraying machine, airing at room temperature for more than 10 minutes after each spraying, and repeatedly coating the inner heat-insulating coating until the thickness of the inner heat-insulating coating meets the requirement;
d5 ) after the spraying is finished, naturally curing, wherein the curing is carried out until the Shore A hardness of the coating reaches more than 70.
9. The method of producing a solid rocket motor insulating core mold coated with an inner insulating layer as claimed in claim 1, wherein: the surface repairing of the heat insulation core mold comprises the following steps:
e1 Carrying out coarse grinding on the internal heat-insulating coating and the defective part by using 200-300-mesh abrasive paper, and carrying out fine grinding on the internal heat-insulating coating and the defective part by using 800-mesh abrasive paper;
e2 The inner heat insulation coating pits and the parts with smaller outer diameters are polished by 800-mesh abrasive paper, then the pits and the parts with smaller outer diameters are repaired to be qualified by adopting a manual spraying mode, the protruding parts are polished to be flat, the axial protruding height of the inner heat insulation coating surface is required to be less than or equal to 1mm after repairing, the annular protruding height of the inner heat insulation coating is required to be less than or equal to 0.8mm, and the surface does not have peeling and wrinkles.
10. A method of producing a gypsum core mold for a solid rocket motor coated with an internal insulating layer as defined in claim 1, wherein: the top coating glue coating comprises the following steps:
f1 Hoisting the repaired heat insulation core mold on a winding machine, and clamping the core mold by using a chuck;
f2 Dipping ethyl acetate by using hairless paper to wipe the surface of the thermal insulation coating in the thermal insulation core mold once, airing for 10-20 min, airing the surface of the inner thermal insulation coating, and then bonding and sealing the front joint wire retaining ring and the tool by using a polytetrafluoroethylene glass fiber adhesive tape to prevent resin glue from permeating into a threaded hole and a mounting surface;
f3 H) is mixed with 2 Stirring the surface coating glue by using a stirrer to wrap the bottom of the container for 3-5 min, uniformly stirring, scraping the surface coating glue gathered at the edge and the bottom of the container by using a glass rod, stirring for 2-6 min by using the glass rod, and fully and uniformly stirring the surface coating glue;
f4 Patting and brushing the hairbrush to clean weak viscose fiber hairs on the surface of the hairbrush, and binding the fixed part of the hairbrush by using a transparent adhesive tape to avoid the falling of screws;
f5 Using a brush to manually and uniformly coat the prepared H2 surface coating adhesive on the whole surface of the inner heat-insulating coating without leaking brushing, wherein an operator needs to wear clean rubber gloves during the adhesive brushing process;
f6 H2 surface coating glue is coated and brushed, then the surface is aired and placed without reflection, and then the bearing layer is wound by fiber within 60-180 min.
CN202211334939.2A 2022-10-28 2022-10-28 Production method of solid rocket engine heat insulation core mold coated with inner heat insulation layer Pending CN115534180A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115870196A (en) * 2022-12-28 2023-03-31 湖北三江航天江北机械工程有限公司 Scraping and forming method for external heat-proof layer of combustion chamber shell

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115870196A (en) * 2022-12-28 2023-03-31 湖北三江航天江北机械工程有限公司 Scraping and forming method for external heat-proof layer of combustion chamber shell

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