CN107718576B - Annular block assembly method for submerged nozzle throat liner - Google Patents
Annular block assembly method for submerged nozzle throat liner Download PDFInfo
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- CN107718576B CN107718576B CN201710827644.1A CN201710827644A CN107718576B CN 107718576 B CN107718576 B CN 107718576B CN 201710827644 A CN201710827644 A CN 201710827644A CN 107718576 B CN107718576 B CN 107718576B
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- throat
- hoop
- insert
- liner
- pressurizing
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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
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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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
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
- B29C66/721—Fibre-reinforced materials
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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
- B29C66/81463—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 comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/97—Rocket nozzles
- F02K9/974—Nozzle- linings; Ablative coatings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/50—Building or constructing in particular ways
- F05D2230/51—Building or constructing in particular ways in a modular way, e.g. using several identical or complementary parts or features
Abstract
The invention discloses an annular block assembly method of a submerged nozzle throat insert, which comprises the following steps: equally dividing a rotary throat liner into N throat liner blocks along the circumferential direction of the throat liner block for processing, wherein each throat liner block is processed into an isosceles trapezoid structure with a chamfer angle by milling a cuboid blank on a numerical control milling machine, and strip-shaped grooves are processed on the trapezoid inclined surfaces on the two sides of each throat liner block along the length direction of the throat liner block; splicing and bonding the N throat lining blocks into a rotary throat lining by using a bonding assembly tool; applying pressure to the throat liner by using a pressurizing tool to perform circumferential reinforcement until the adhesive is completely cured; and (4) after the pressurizing tool is disassembled, taking out the throat liner after bonding and curing, and machining and molding according to the designed shape and size. The assembly method can effectively reduce the production and processing difficulty of the throat insert and ensure the consistency of the product quality.
Description
Technical Field
The invention relates to the technical field of a submerged nozzle throat insert, in particular to an annular block assembling method of the submerged nozzle throat insert.
Background
The jet pipe aircraft of the solid rocket engine provides the part of thrust, the throat insert is positioned at the throat part of the jet pipe, the ablation state is the most harsh, the inner profile of the throat insert is easily damaged by scouring and ablation of heat flow which is high in temperature, high in pressure and high in speed and contains erosive particles, particularly, at the moment of engine ignition, the throat insert is heated up suddenly from normal temperature at the speed of more than 2000 ℃/s to generate great temperature gradient and thermal stress, the throat insert is easy to crack or break, the thrust and the efficiency of the engine are directly influenced, and even the working capacity is lost.
At present, the most common material for the throat insert of the solid rocket engine at home and abroad is an integral 3D woven C/C composite material. Due to rapid development of domestic and foreign solid rocket engine technologies, large-diameter and large-flow solid rocket engines are increasingly applied, but for the integral 3D woven C/C composite throat insert, due to the limitation of manufacturing processes and equipment, when the size of the throat insert reaches a certain bottleneck size, the process difficulty and complexity are greatly increased, the quality of a formed product is poor, the defects of nonuniform carburization, more carbon-rich areas, large material strength dispersion and the like can exist, the consistency of the product is difficult to guarantee, and the production cost is high.
Disclosure of Invention
The invention aims to provide an annular block assembly method of a submerged nozzle throat insert, which uniformly divides a rotary throat insert into N throat insert blocks along the annular direction of the rotary throat insert for assembly, can effectively reduce the production and processing difficulty of the throat insert, and ensures the consistency of product quality.
In order to achieve the aim, the invention provides a circumferential block assembly method of a submerged nozzle throat insert, which comprises the following steps:
1) equally dividing a rotary throat liner into N throat liner blocks along the circumferential direction of the throat liner block for processing, wherein each throat liner block is processed into an isosceles trapezoid structure with a chamfer angle by milling a cuboid blank on a numerical control milling machine, and strip-shaped grooves are processed on the trapezoid inclined surfaces on the two sides of each throat liner block along the length direction of the throat liner block;
2) splicing and bonding N throat lining blocks into a rotary throat lining by using a bonding assembly tool, filling an adhesive between two adjacent throat lining blocks, and filling strip-shaped anti-ablation materials into strip-shaped grooves on two sides of each throat lining block;
3) applying pressure to the throat liner by using a pressurizing tool to perform circumferential reinforcement until the adhesive is completely cured;
4) and (4) after the pressurizing tool is disassembled, taking out the throat liner after bonding and curing, and machining and molding according to the designed shape and size.
Further, in the step 2), the bonding assembly tool comprises a base, a mandrel arranged in the middle of the base and vertically and fixedly connected with the base, and a bushing sleeved on an outer ring of the mandrel;
the upper end face of the base is provided with an annular groove which is used for placing the throat lining block and is arranged around the periphery of the mandrel, the cross section of the annular groove is in an inverted right-angle trapezoid shape, and the trapezoid inclined plane of the annular groove can be abutted against the oblique angle of the throat lining block.
Furthermore, the middle part of the base is provided with a limiting hole, and the bottom of the mandrel is provided with a limiting boss which is embedded with the limiting hole.
Further, in the step 3), the pressurizing tool includes a hollow circular truncated cone-shaped hoop, a sliding cover, a pressure sensing device and a pressurizing platform, wherein the hollow circular truncated cone-shaped hoop is used for being sleeved on an outer ring of the throat insert and exerting circumferential constraint force on the throat insert, the sliding cover is used for being sleeved on the outer ring of the hoop and exerting circumferential constraint force on the hoop and is provided with a circular truncated cone-shaped inner cavity, the pressure sensing device is arranged above the sliding cover and is used for transmitting downward pressure to the sliding cover, and the pressurizing platform is arranged above the pressure sensing device and is used for exerting downward pressure on the;
the hoop consists of a first half hoop and a second half hoop, and the joint of the first half hoop and the second half hoop is in a sawtooth shape; the diameter of the outer ring of the hoop is gradually increased from the top end to the bottom end, the diameter of the inner cavity of the sliding cover is gradually increased from the top end to the bottom end, and the shape of the inner cavity of the sliding cover is matched with the shape of the outer ring of the hoop; the sliding cover can slide downwards along the outer wall of the hoop to form circumferential restraint on the periphery of the hoop under the action of downward pressure applied by the pressurizing platform.
Further, the pressurization frock still includes the guide bar that sets up in pressurization platform both sides and is used for the supporting platform of fixed guide bar, the both sides correspondence of pressurization platform is provided with the guiding hole that is used for supplying the guide bar to pass.
Further, in the step 2), a specific method for splicing and bonding the N throat insert blocks into the rotary throat insert by using the bonding assembly tool comprises the following steps:
2.1) the core shaft penetrates through the limiting hole of the base from bottom to top until the limiting boss at the bottom is embedded with the limiting hole, and then the bushing is sleeved on the core shaft;
2.2) coating an adhesive on the trapezoidal slopes on the two sides of the throat filler block, and filling an ablation-resistant material into the strip-shaped groove;
2.3) the throat lining blocks are sequentially placed in the annular groove along the circumferential direction, the oblique cutting angles of the throat lining blocks are abutted against the trapezoidal inclined surfaces of the annular groove, and the trapezoidal inclined surfaces of two adjacent throat lining blocks are attached until the last throat lining block is assembled.
Further, in the step 3), the specific step of applying pressure to the throat insert by using the pressurizing tool to circumferentially reinforce the throat insert includes:
3.1) sleeving a hoop on the outer ring of the throat insert treated in the step 2), smearing a release agent on the inner wall and the upper and lower end faces of the hoop, abutting the bottom end face of the hoop against the trapezoidal inclined plane of the annular groove, and adjusting each throat insert block to be firmly attached to the bushing;
3.2) a slip cover is sleeved on the upper part of the outer ring of the hoop, a pressure sensing device and a pressurizing platform are sequentially placed on the upper part of the slip cover, and a guide hole on the pressurizing platform penetrates through a corresponding guide rod;
3.3) slowly applying downward pressure to the pressurizing platform, stopping pressurizing until the pressure value reaches a set value, and maintaining the pressure until the adhesive is completely cured.
Further, in the step 4), in the machining process, the throat liner is clamped through a containing ring sleeved on the outer ring of the throat liner, and the containing ring is provided with an opening with adjustable tightness.
Further, in the step 1), N is an integer within 10-30; the cuboid blank is a blank made of a C/C composite material.
Further, in the step 2), the strip-shaped ablation-resistant material is an elastic strip-shaped member made of flexible graphite or carbon fiber material.
Compared with the prior art, the invention has the following advantages:
firstly, the throat insert of the invention is processed by equally dividing the throat insert of the rotary body into N throat insert blocks along the circumferential direction, and then the throat insert is connected into an integral throat insert by a specific assembly process and an assembly tool, the volume of the single throat insert block is smaller than that of the integral throat insert, and the production and processing difficulty of the throat insert can be effectively reduced.
Secondly, the large-size throat insert is divided into N small-size throat insert blocks for processing, the blank size is reduced, raw materials can be effectively saved, the process preparation and processing cost is reduced, meanwhile, due to the fact that the size of the single throat insert block is reduced and the thickness of the throat insert block is reduced, carburization is uniform, and the quality consistency of products is easy to guarantee.
Thirdly, the N throat lining blocks are spliced and bonded into the rotary throat lining by using the splicing and assembling tool, the upper end surface of the base of the splicing and assembling tool is provided with an annular groove which is used for placing the throat lining block and is arranged around the periphery of the mandrel, the cross section of the annular groove is in a shape of an inverted right trapezoid, the trapezoidal inclined plane of the annular groove can be abutted against the oblique angle of the throat lining block, and the throat lining block is supported and positioned.
Fourthly, the pressurizing tool is used for applying pressure to the throat lining for circumferential reinforcement in the assembling method, the pressurizing tool is provided with a hoop and a sliding cover, the sliding cover can slide downwards along the outer wall of the hoop under the action of downward pressure applied by the pressurizing platform to form circumferential restraint on the periphery of the hoop, and simultaneously, the annularly partitioned throat lining blocks are pressurized and automatically locked, so that the uniformity of bonding between the throat lining blocks is ensured.
Drawings
FIG. 1 is a schematic view of a submerged nozzle throat insert;
FIG. 2 is an enlarged schematic view of the throat pad;
FIG. 3 is a schematic cross-sectional view taken along A-A of FIG. 2;
FIG. 4 is a schematic structural view of the throat insert block during bonding;
FIG. 5 is a schematic view of the structure of the throat insert during press curing;
FIG. 6 is a schematic view of the hoop of FIG. 5;
FIG. 7 is a schematic diagram of a containment ring;
in the figure: the throat lining comprises a throat lining 1, a throat lining block 2, a chamfer angle 2.1, a strip-shaped groove 2.2, a bonding assembly tool 3, a base 3.1, an annular groove 3.11, a limiting hole 3.12, a mandrel 3.2, a limiting boss 3.21, a bushing 3.3, a pressurizing tool 4, a hoop 4.1, a first half hoop 4.11, a second half hoop 4.12, a sliding cover 4.2, a pressure sensing device 4.3, a pressurizing platform 4.4, a guide hole 4.41, a guide rod 4.5, a supporting platform 4.6, a containing ring 5 and an opening 5.1.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.
As shown in the figure, the annular block assembly method of the submerged nozzle throat insert comprises the following steps:
1) equally dividing a rotary throat liner 1 into N (N is an integer within 10-30) throat liner blocks 2 along the circumferential direction of the rotary throat liner 1, machining each N throat liner blocks 2 by a cuboid blank (a regular cuboid blank made of a C/C composite material) on a numerical control milling machine to form an isosceles trapezoid structure with a chamfer angle 2.1, and machining strip-shaped grooves 2.2 on the trapezoidal inclined surfaces on the two sides of each throat liner block 2 along the length direction of the throat liner block;
2) n throat lining blocks 2 are spliced and adhered into a rotary throat lining 1 by using a splicing assembly tool 3, an adhesive (preferably an ultrahigh-temperature-resistant organic adhesive) is filled between every two adjacent throat lining blocks 2, strip-shaped anti-ablation materials are filled in strip-shaped grooves 2.2 on two sides of each throat lining block 2, and the strip-shaped anti-ablation materials are elastic strip-shaped components made of flexible graphite or carbon fiber materials, so that a 'blind zone' structure is formed, and the problem that the work of an engine fails due to fire penetration is solved;
3) applying pressure to the throat liner 1 by using a pressurizing tool 4 to circumferentially reinforce until the adhesive is completely cured, so as to ensure the uniformity of bonding between the throat filler blocks 2;
4) after the pressurizing tool 4 is disassembled, the throat liner 1 after bonding and curing is taken out to be machined and formed according to the designed shape and size, in the machining process, the throat liner 1 is clamped through a containing ring 5 sleeved on the outer ring of the throat liner 1, and the containing ring 5 is provided with an opening 5.1 capable of adjusting tightness.
In the technical scheme, in the step 2, the bonding assembly tool 3 comprises a base 3.1, a mandrel 3.2 arranged in the middle of the base 3.1 and vertically and fixedly connected with the base, and a bushing 3.3 sleeved on the outer ring of the mandrel 3.2; the upper end face of the base 3.1 is provided with an annular groove 3.11 which is used for placing the throat filler block 2 and is arranged around the periphery of the mandrel 3.2, the cross section of the annular groove 3.11 is in a shape of an inverted right trapezoid, and the trapezoid inclined plane of the annular groove 3.11 can be abutted against the chamfer angle 2.1 of the throat filler block 2. The middle part of the base 3.1 is provided with a limiting hole 3.12, and the bottom of the mandrel 3.2 is provided with a limiting boss 3.21 which is embedded with the limiting hole 3.12.
In the above technical scheme, in the step 2, the specific method for splicing and bonding the N throat insert blocks 2 into the rotary throat insert 1 by using the splicing and assembling tool 3 comprises the following steps:
2.1) the core shaft 3.2 penetrates through the limiting hole 3.12 of the base 3.1 from bottom to top until the limiting boss 3.21 at the bottom is embedded with the limiting hole 3.12, and then the bushing 3.3 is sleeved on the core shaft 3.2;
2.2) coating an adhesive on the trapezoidal slopes on the two sides of the throat filler block 2, and filling an anti-ablation material into the strip-shaped groove 2.2;
2.3) put throat filler block 2 in the ring channel 3.11 along circumference in proper order, and the chamfer angle 2.1 of throat liner block 2 and the trapezoidal inclined plane of ring channel 3.11 counterbalance, until the last throat filler block 2 assembly is accomplished, the one side end face of the trapezoidal body area minimum of throat liner block 2 is towards bush 3.3 and rather than the outer wall laminating, laminate each other between the trapezoidal inclined plane of two adjacent throat filler blocks 2, the width of throat filler block 2 is by the one end towards bush 3.3 to the one end of orientation hoop 4.1 crescent.
In the above technical scheme, in step 3, the pressurizing tool 4 includes a hollow circular truncated cone-shaped hoop 4.1 which is used for being sleeved on the outer ring of the throat insert 1 and can apply circumferential constraint force to the hollow circular truncated cone-shaped hoop, a sliding cover 4.2 which is used for being sleeved on the outer ring of the hoop 4.1 and can apply circumferential constraint force to the hoop, a pressure sensing device 4.3 which is arranged above the sliding cover 4.2 and is used for transmitting downward pressure to the sliding cover, a pressurizing platform 4.4 which is arranged above the pressure sensing device 4.3 and is used for applying downward pressure to the pressurizing platform, guide rods 4.5 which are arranged on two sides of the pressurizing platform 4.4, and a supporting platform 4.6 which is used for fixing the guide rods 4.5, wherein guide holes 4.41 through which the guide rods 4.5 can pass are correspondingly arranged on two sides of the pressurizing platform 4.4. The hoop 4.1 consists of a first semi-hoop 4.11 and a second semi-hoop 4.12, and the joint of the first semi-hoop 4.11 and the second semi-hoop 4.12 is in a sawtooth shape; the diameter of the outer ring of the hoop 4.1 is gradually increased from the top end to the bottom end, the diameter of the inner cavity of the sliding cover 4.2 is gradually increased from the top end to the bottom end, and the shape of the inner cavity of the sliding cover 4.2 is matched with the shape of the outer ring of the hoop 4.1; the sliding cover 4.2 can slide downwards along the outer wall of the hoop 4.1 under the action of downward pressure applied by the pressurizing platform 4.4 to form circumferential restraint on the outer periphery of the hoop 4.1.
In the above technical scheme, in step 3, the specific steps of applying pressure to the throat insert 1 by using the pressurizing tool 4 to circumferentially reinforce are as follows:
3.1) sleeving a hoop 4.1 on the outer ring of the throat insert 1 treated in the step 2, smearing a release agent on the inner wall and the upper and lower end faces of the hoop 4.1 to ensure that the inner wall and the upper and lower end faces are bonded together by the extruded adhesive, abutting the bottom end face of the hoop 4.1 against the trapezoidal inclined plane of the annular groove 3.11, checking and manually adjusting each throat insert 2 to be firmly attached to the bush 3.3, wherein the bush 3.3 is made of an elastic non-metal material;
3.2) a sliding cover 4.2 is sleeved on the upper part of the outer ring of the hoop 4.1, a pressure sensing device 4.3 and a pressurizing platform 4.4 are sequentially placed on the upper part of the sliding cover 4.2, and a guide hole 4.41 on the pressurizing platform 4.4 penetrates through a corresponding guide rod 4.5;
3.3) slowly applying downward pressure to the pressurizing platform 4.4 until the pressure value reaches a set value, stopping pressurizing, and maintaining the pressure until the adhesive is completely cured.
The throat insert is divided into N throat insert blocks with specific structural forms from the original integral throat insert structure, and then the throat insert is connected into the integral throat insert through a specific assembly process and an assembly tool. The volume of the single throat liner block is smaller than that of the whole throat liner, so that the production and processing difficulty of the throat liner can be effectively reduced; because the size of the blank is reduced, the raw materials can be effectively saved, and the process preparation and processing cost is also reduced; meanwhile, the size of the independent throat insert is reduced, the thickness is reduced, so that the carburization is uniform, and the quality consistency of the product is easier to guarantee.
The above are only embodiments of the present invention, and it should be noted that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention.
Claims (4)
1. A circumferential block assembly method for a submerged nozzle throat insert is characterized by comprising the following steps: it comprises the following steps:
1) equally dividing a rotary throat liner (1) into N throat filler blocks (2) along the circumferential direction of the throat liner for processing, wherein each throat filler block (2) is processed into an isosceles trapezoid structure with a chamfer angle (2.1) by a rectangular blank on a numerical control milling machine through milling, and strip-shaped grooves (2.2) are processed on the trapezoidal inclined surfaces on the two sides of each throat filler block (2) along the length direction of the throat filler block;
2) n throat filler blocks (2) are spliced and bonded into a throat liner (1) in a rotary body shape by using a splicing and assembling tool (3), an adhesive is filled between every two adjacent throat filler blocks (2), and strip-shaped grooves (2.2) on two sides of each throat filler block (2) are filled with strip-shaped ablation-resistant materials;
3) applying pressure to the throat liner (1) by using a pressurizing tool (4) for circumferential reinforcement until the adhesive is completely cured;
4) after the pressurizing tool (4) is disassembled, taking out the throat liner (1) after bonding and curing, and machining and molding according to the designed shape and size;
in the step 2), the bonding assembly tool (3) comprises a base (3.1), a mandrel (3.2) arranged in the middle of the base (3.1) and vertically and fixedly connected with the base, and a bushing (3.3) sleeved on the outer ring of the mandrel (3.2);
the upper end face of the base (3.1) is provided with an annular groove (3.11) which is used for placing the throat lining block (2) and is arranged around the periphery of the mandrel (3.2), the cross section of the annular groove (3.11) is in an inverted right-angle trapezoidal shape, and the trapezoidal inclined plane of the annular groove (3.11) can be abutted against the oblique angle (2.1) of the throat lining block (2); a limiting hole (3.12) is formed in the middle of the base (3.1), and a limiting boss (3.21) which is embedded with the limiting hole (3.12) is arranged at the bottom of the mandrel (3.2);
the concrete method for splicing and bonding the N throat filler blocks (2) into the rotary throat liner (1) by using the bonding assembly tool (3) comprises the following steps:
2.1) the mandrel (3.2) penetrates through the limiting hole (3.12) of the base (3.1) from bottom to top until the limiting boss (3.21) at the bottom is embedded with the limiting hole (3.12), and then the bushing (3.3) is sleeved on the mandrel (3.2);
2.2) coating an adhesive on the trapezoidal slopes on the two sides of the throat filler block (2), and filling an ablation-resistant material in the strip-shaped groove (2.2);
2.3) the throat filler blocks (2) are sequentially placed in the annular groove (3.11) along the circumferential direction, the chamfer angles (2.1) of the throat filler blocks (2) are abutted against the trapezoidal inclined surfaces of the annular groove (3.11), and the trapezoidal inclined surfaces of two adjacent throat filler blocks (2) are attached until the last throat filler block (2) is assembled;
in the step 3), the pressurizing tool (4) comprises a hollow circular truncated cone-shaped hoop (4.1) which is used for being sleeved on the outer ring of the throat insert (1) and can apply circumferential constraint force to the outer ring, a sliding cover (4.2) which is used for being sleeved on the upper portion of the outer ring of the hoop (4.1) and can apply circumferential constraint force to the outer ring, and is provided with a circular truncated cone-shaped inner cavity, a pressure sensing device (4.3) which is arranged on the upper portion of the sliding cover (4.2) and is used for transmitting downward pressure to the sliding cover, and a pressurizing platform (4.4) which is arranged on the upper portion of the pressure sensing device (4.3) and is used for applying downward;
the hoop (4.1) consists of a first half hoop (4.11) and a second half hoop (4.12), and the joint of the first half hoop (4.11) and the second half hoop (4.12) is in a sawtooth shape; the diameter of the outer ring of the hoop (4.1) is gradually increased from the top end to the bottom end, the diameter of the inner cavity of the sliding cover (4.2) is gradually increased from the top end to the bottom end, and the shape of the inner cavity of the sliding cover (4.2) is matched with the shape of the outer ring of the hoop (4.1); the sliding cover (4.2) can slide downwards along the outer wall of the hoop (4.1) under the action of downward pressure exerted by the pressurizing platform (4.4) to form circumferential constraint on the periphery of the hoop (4.1);
the pressurizing tool (4) further comprises guide rods (4.5) arranged on two sides of the pressurizing platform (4.4) and a supporting platform (4.6) used for fixing the guide rods (4.5), and guide holes (4.41) used for allowing the guide rods (4.5) to penetrate through are correspondingly formed in two sides of the pressurizing platform (4.4);
the method for reinforcing the throat liner (1) in the circumferential direction by applying pressure to the throat liner (1) through the pressurizing tool (4) comprises the following specific steps:
3.1) sleeving a hoop (4.1) on the outer ring of the throat insert (1) treated in the step 2), smearing a release agent on the inner wall and the upper and lower end faces of the hoop (4.1), abutting the bottom end face of the hoop (4.1) against the trapezoidal inclined plane of the annular groove (3.11), and adjusting each throat insert block (2) to be firmly attached to the insert (3.3);
3.2) a slip cover (4.2) is sleeved on the upper part of the outer ring of the hoop (4.1), a pressure sensing device (4.3) and a pressurizing platform (4.4) are sequentially placed on the upper part of the slip cover (4.2), and a guide hole (4.41) on the pressurizing platform (4.4) penetrates through a corresponding guide rod (4.5);
3.3) slowly applying downward pressure to the pressurizing platform (4.4), stopping pressurizing until the pressure value reaches a set value, and keeping the pressure until the adhesive is completely cured.
2. The method of assembling a submersible nozzle throat insert in circumferential segments according to claim 1, wherein: in the step 4), in the machining process, the throat insert (1) is clamped through a containing ring (5) sleeved on the outer ring of the throat insert, and the containing ring (5) is provided with an opening (5.1) with adjustable tightness.
3. The method of assembling a submersible nozzle throat insert in circumferential segments according to claim 1, wherein: in the step 1), N is an integer within 10-30; the cuboid blank is a blank made of a C/C composite material.
4. The method of assembling a submersible nozzle throat insert in circumferential segments according to claim 1, wherein: in the step 2), the strip-shaped anti-ablation material is an elastic strip-shaped component made of flexible graphite or carbon fiber materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710827644.1A CN107718576B (en) | 2017-09-14 | 2017-09-14 | Annular block assembly method for submerged nozzle throat liner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710827644.1A CN107718576B (en) | 2017-09-14 | 2017-09-14 | Annular block assembly method for submerged nozzle throat liner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107718576A CN107718576A (en) | 2018-02-23 |
| CN107718576B true CN107718576B (en) | 2020-05-08 |
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| CN113323770B (en) * | 2021-05-18 | 2022-08-09 | 湖北三江航天江北机械工程有限公司 | Special device for precisely bonding throat linings of large solid rocket engine in blocks |
| CN113339373B (en) * | 2021-05-18 | 2022-06-10 | 湖北三江航天江北机械工程有限公司 | Method for forming throat insert of large solid rocket engine |
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| CN106050477B (en) * | 2016-07-28 | 2020-01-03 | 湖北航天技术研究院总体设计所 | Combined throat insert spray pipe of solid rocket engine and manufacturing method |
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