CN112497699B - Integrated extrusion molding system and method for combustion chamber cylinder section-end enclosure heat insulation layer - Google Patents
Integrated extrusion molding system and method for combustion chamber cylinder section-end enclosure heat insulation layer Download PDFInfo
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- CN112497699B CN112497699B CN202011186122.6A CN202011186122A CN112497699B CN 112497699 B CN112497699 B CN 112497699B CN 202011186122 A CN202011186122 A CN 202011186122A CN 112497699 B CN112497699 B CN 112497699B
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
- B29C48/152—Coating hollow articles the inner surfaces thereof
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/748—Machines or parts thereof not otherwise provided for
- B29L2031/749—Motors
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Abstract
The invention provides a combustor cylinder section-end enclosure heat insulation layer integrated extrusion molding system and a method, which comprises a base, an extruder and a combustor shell, wherein the combustor shell is of a cylinder section-end enclosure integral structure and also comprises a transition sleeve, a core mold adapter flange and a support, and the extruder, the transition sleeve, the core mold, the combustor shell, the core mold adapter flange and the support are sequentially and coaxially arranged from left to right; the method specifically comprises the following steps: step one, a preparation stage; step two, a mould-shell butt joint stage; step three, an extrusion molding stage; and step four, disassembling and post-processing. Based on the extrusion process mature in the civil field, the invention can realize the integrated rapid molding function of the cylinder section-end socket heat insulation layer, greatly reduce the cost in the aspects of equipment, process, mould and the like, and has wide application range to a heat insulation sizing material system.
Description
Technical Field
The invention belongs to the field of solid rockets, relates to the manufacture of an engine heat insulation layer, and particularly relates to a system and a method for integrated extrusion molding of a combustion chamber cylinder section and a seal head heat insulation layer.
Background
Along with the development requirements of high performance and low cost of the solid rocket engine or the ramjet engine, corresponding requirements are also put forward on the thermal protection structure of the engine. The heat insulating layer is used as a main heat protection structure of the combustion chamber, the ablation resistance and the quality reliability of the heat insulating layer have important influence on the working reliability of the engine, and the manufacturing process of the heat insulating layer is one of important factors for determining the quality reliability of the heat insulating layer.
The solid rocket or ramjet combustion chamber is similar to a high-pressure container structure, which is generally composed of a thin-wall pipe body and an oval ball head (called a seal head for short) with a small opening, and the corresponding heat insulation layer is also in a pipe body and seal head structure. The present manufacturing process of the thermal insulation layer of the combustion chamber can be roughly classified into a composite material housing and a metal housing according to the characteristics of the combustion chamber housing. For a composite shell (mainly a winding shell), the heat-insulating layer can be paved or wound on the surface of the core mold, and after the shell is wound, the shell is vulcanized together; or adhering a heat insulating layer after the winding of the shell is finished. For a metal casing, an insulating layer is usually applied after the casing is finished. When the metal cylinder section and the end enclosure are of a split structure, heat insulation layers are prefabricated on the cylinder section and the end enclosure respectively through processes of manual paving, coating, extrusion molding or compression molding and the like, and then the cylinder section and the end enclosure are assembled into a whole. Pengzheng et al (CN 104552692A) invented a method for extruding and forming to realize the precise formation of heat insulating layer of slender combustion chamber, but it is necessary to first spread and stick the prefabricated heat insulating layer green sheet in the combustion chamber shell. Pengzheng et al (CN 109838321A) also invented a method for forming the heat insulating layer of the rear end enclosure, and proposed that the structural layers with different functions and materials, such as the anti-scouring heat insulating layer and the light heat insulating layer, are preformed on the metal end enclosure.
When the metal cylinder section and the end enclosure are of an integral structure, the process can be finished only by a manual paving or coating process at present. Zhengguang tiger (CN 107584771A) realizes the integral molding of the cylinder section-end enclosure heat insulation layer by a method of 'manual paving and air bag pressurization', but an inner heat insulation layer rubber sleeve is prefabricated by a mold. Sunshuxing et al (CN 108000888A) invented an integral molding method for a cylinder segment and a head heat-insulating layer, but the requirement for the fluidity of the heat-insulating glue stock is high, and the heat-insulating glue stock is required to be ensured to automatically flow into a mold cavity by means of gravity. However, such thermally insulating compounds tend to have a low content of fibers or fillers and a corresponding poor ablation resistance. This method has certain implications for the present invention.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a system and a method for integrated extrusion molding of a cylinder section and a head heat insulation layer of a combustion chamber, and solve the technical problems of high difficulty and low efficiency of the integrated molding process of the cylinder section and the head heat insulation layer in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
a combustor cylinder section-end enclosure heat insulation layer integrated extrusion molding system comprises a base, an extruder and a combustor shell, wherein the combustor shell is of a cylinder section-end enclosure integral structure and further comprises a transition sleeve, a core mold adapter flange and a support, and the extruder, the transition sleeve, the core mold, the combustor shell, the core mold adapter flange and the support are sequentially and coaxially arranged from left to right;
a slide rail is laid on the base, an extruder is fixedly mounted on the base at the left end of the slide rail, a first center frame, a second center frame and a sliding base which can slide on the slide rail are sequentially mounted on the slide rail from left to right, the first center frame supports the core mold, the second center frame supports the shell of the combustion chamber, and the sliding base supports a support;
the extruder comprises an extruding cylinder, the top of the left end of the extruding cylinder is provided with a hopper, an extruding screw is arranged in the extruding cylinder, and the right end of the extruding cylinder is open;
the mandrel comprises a metal pipe body, a left shaft head is arranged at the left end of the metal pipe body, a right shaft head is arranged at the right end of the metal pipe body, the left shaft head is installed at the right end of the extrusion screw through a bearing, and a butt joint blind hole is formed in the right shaft head in the axial direction; the outer diameter of the core mold is smaller than the inner diameter of the combustion chamber shell, and the outer profile of the core mold is consistent with the designed inner profile of the heat insulation layer; a left part of the metal pipe body is provided with a left flange of the core die; a plurality of heat-insulating sizing material flow channels are arranged on the left flange of the core mold;
the left end of the transition sleeve is provided with a transition sleeve left flange, the right end of the transition sleeve is provided with a transition sleeve right flange, the transition sleeve left flange is connected with the right end of an extrusion cylinder of the extruder, and the transition sleeve right flange is connected with a mandrel left flange; the left part of the core mould and the transition sleeve are both in a conical barrel structure, and an annular gap is formed between the transition sleeve and the core mould;
the left end of the combustion chamber shell is provided with a shell switching left flange, the right end of the combustion chamber shell is provided with a shell switching right flange, and the shell switching right flange is provided with a material overflowing hole;
a support flange is arranged on the left side of the support;
the support is connected with the combustion chamber shell through a support, the core mould adapter flange is connected with the combustion chamber shell through a support, the combustion chamber shell is connected with the combustion chamber shell through a combustion chamber, the combustion chamber shell is connected with the support through a combustion chamber, the combustion chamber shell is connected with the combustion chamber shell, the support is connected with the combustion chamber shell through a combustion chamber, the combustion chamber shell is connected with the combustion chamber shell, the combustion chamber shell is connected with the support through a combustion chamber shell, the combustion chamber shell is connected with the combustion chamber shell, and the combustion chamber shell is connected with the combustion chamber shell.
The invention also has the following technical characteristics:
the left and right sides of support be provided with left supporting roller and right supporting roller respectively.
The first center frame is provided with a supporting roller contacted with the core mold.
The number of the first center frames is one, and the number of the second center frames is two.
The heat insulation layer adopts heat insulation sizing material which is silicon rubber based composite material, ethylene propylene diene monomer rubber based composite material or nitrile rubber based composite material.
The butt joint rod is a slender metal rod or a pipe, the length of the butt joint rod is twice that of the combustion chamber shell, and the butt joint rod is made of heat-treated 45# steel or 40Cr steel.
The invention also discloses a combustion chamber cylinder section-end socket heat insulation layer integrated extrusion molding method, which adopts the combustion chamber cylinder section-end socket heat insulation layer integrated extrusion molding system;
the method is specifically carried out according to the following steps:
step one, a preparation stage:
polishing the inner wall of a combustion chamber shell roughly and cleanly, installing a shell switching left flange and a shell switching right flange, connecting a transition sleeve left flange with the right end of an extrusion cylinder, installing a core die left shaft head at the right end of an extrusion screw rod through a bearing, connecting the transition sleeve right flange with a core die left flange, supporting the core die right end through a first center frame, and supporting the combustion chamber shell through a second center frame; sequentially penetrating a butt joint rod through the support, the core mold adapter flange and the combustion chamber shell, wherein the left end of the butt joint rod is arranged in a butt joint blind hole of the core mold;
step two, a mould-shell butt joint stage:
sliding the first center frame, the second center frame and the sliding base together leftwards to drive the combustion chamber shell, the core mold adapter flange and the support to move leftwards simultaneously until the right spindle nose of the core mold extends out of the shell adapter flange; the first center frame is disassembled, the second center frame and the sliding base continue to move leftwards until the right spindle nose of the core mold completely extends into the core mold adapter flange, and the right spindle nose of the core mold is connected and fastened with the core mold adapter flange; connecting the core mold adapter flange and the support flange, and removing the butt joint rod; adjusting the position of the shell of the combustion chamber to enable the shell switching left flange to be in butt joint with the core die left flange; locking the second center frame and the sliding base so that the second center frame and the sliding base cannot slide on the sliding rail;
step three, an extrusion-injection molding stage:
starting the extruder, continuously feeding heat-insulating rubber material into the hopper, allowing the heat-insulating rubber material to sequentially pass through the extruder and the transition sleeve to enter a gap between the core mold and the shell of the combustion chamber, and synchronously stopping feeding and extruding after the heat-insulating rubber material is gradually filled in the gap and the flash hole on the right adapter flange of the shell continuously stabilizes flash;
step four, disassembling and post-processing:
the second center frame and the sliding base are unlocked to enable the second center frame and the sliding base to slide on the sliding rail, and after the left flange of the core mold and the right flange of the transition sleeve are disassembled, the core mold, the combustion chamber shell and the support which are sleeved together are pushed rightwards together; installing a cover flange on the shell transfer left flange to plug a heat insulation sizing material; and then sequentially disassembling the core mold adapter flange and the support flange as well as the core mold adapter flange and the right spindle nose of the core mold, disassembling the clamp of the second center frame, transferring the core mold-shell suite to a curing furnace for curing, withdrawing the core mold after curing and cooling are finished, disassembling the shell adapter left flange and the shell adapter right flange, and shaping to obtain the combustor shell with the heat insulation layer formed by the combustor barrel section-end enclosure heat insulation layer integrated extrusion.
In the first step, the abrasive blasting is adopted for replacing the rough grinding.
In the first step, after rough grinding and cleaning, the inner wall of the combustion chamber shell is coated with bonding primer.
In the second step, the right spindle nose of the core mould is connected and fastened with the core mould adapter flange through a screw.
And in the second step, after the right shaft head of the core mold is connected and fastened with the core mold adapter flange, the left support roller is detached.
Compared with the prior art, the invention has the following technical effects:
the invention (I) is based on the principle of the extrusion process, and aims at the ablation-resistant heat-insulating sizing material with high fiber and filler content to realize the integrated rapid molding of the combustion chamber cylinder section-end enclosure heat-insulating layer. In the existing heat insulation layer forming process technology, splicing and assembling can only be performed after the barrel section and the end socket are formed in a segmented mode, and the splicing position may have the risks of air leakage and fire leaping, so that the intrinsic safety of an engine is threatened. The disclosed integral molding process of the cylinder section-end socket heat insulation layer can only be suitable for a heat insulation layer system with good sizing material fluidity, or a cylinder section-end socket heat insulation layer integral sleeve needs to be prefabricated by an additional mold, so that the material system has narrow application range, high cost and difficult quality consistency guarantee. Based on the extrusion process mature in the civil field, the invention can realize the integrated rapid molding function of the cylinder section-end socket heat insulation layer, greatly reduce the cost in the aspects of equipment, process, mould and the like, and has wide application range to a heat insulation sizing material system.
The process equipment related to the invention has better size and workpiece structure adaptability, has the potential of being capable of being developed into a batch rapid forming process technology, and is expected to provide technical support for batch train packaging of weaponry. The extrusion injection molding process principle can design different transition sleeves and core molds according to the design requirements of different shapes and different inner heat insulation layers, can be suitable for the integrated molding of the cylinder sections and the end enclosure heat insulation layers with different sizes and molded surfaces, and even can be suitable for the manufacturing of the heat insulation layer of the combustion chamber of the scramjet engine with the characteristics of a square pipe or a special-shaped structure.
The invention breaks through the limitation that the traditional engine heat-insulating layer barrel section and the end socket can only be paved or formed in a segmented manner, so that the barrel section and the end socket heat-insulating layer are integrated, and the risks of air leakage, fire leaping and the like of the engine during working due to lap joints of the heat-insulating layer are greatly reduced; the method breaks through the limitations of insufficient dimensional stability, low efficiency and the like caused by the processes of manual paving and pasting of the heat insulating layer of the traditional engine, forming of the air bag and the like, and the product qualification rate and the quality of the heat insulating layer are essentially improved; the method has wide application range of process and product specification, can be used for preparing the combustion chamber heat insulation layer based on various heat insulation rubber materials and various specifications or complex profiles, and greatly reduces the investment cost of equipment and moulds.
(IV) because the integral molding process of the cylinder section and the end socket heat insulating layer has great difficulty, the high-efficiency and high-reliability automatic molding process technology for the heat insulating sizing material with high fiber and filler content is still not needed at present. The invention provides a simple, reliable and wide-application-range integrated forming process technology for the cylinder section-end enclosure heat insulation layer, which aims to solve the problems that the integral forming process of the cylinder section and the end enclosure heat insulation layer is difficult to realize, time and labor are wasted when manual paving is carried out, and quality consistency and precision are difficult to guarantee in the prior art, and is based on the principle of a squeeze forming process, so that the risks of air leakage and fire leaping caused by splicing of the cylinder section-end enclosure heat insulation layer can be substantially reduced. The method can be developed into a batch forming process technology, and is expected to provide technical support for batch train packaging of weaponry.
Drawings
FIG. 1 is a schematic diagram of the integrated molding system of the present invention at a preparation stage.
Fig. 2 is a schematic structural diagram of the integrated molding system of the present invention at the extrusion stage.
Fig. 3 is a schematic view of the structure of the combustor casing-core mold assembly.
Fig. 4 is a schematic view of the structure of the combustion chamber housing with the heat insulating layer.
Fig. 5 is a CT image of a combustor casing with insulation.
The meaning of the individual reference symbols in the figures is: 1-base, 2-extruder, 3-combustor shell, 4-transition sleeve, 5-core mold, 6-core mold adapter flange, 7-support, 8-butt rod, 9-slide rail, 10-first center frame, 11-second center frame, 12-sliding base, 13-support roller, 14-core mold-shell external member, 15-combustor shell with heat insulating layer, 16-heat insulating layer, 17-cover flange;
201-extrusion cylinder, 202-hopper, 203-extrusion screw;
301-shell transfer left flange, 302-shell transfer right flange, 303-overflow hole;
401-transition sleeve left flange, 402-transition sleeve right flange, 403-annular gap;
501-a metal pipe body, 502-a left shaft head, 503-a right shaft head, 504-a butt blind hole, 505-a core mold left flange and 506-a heat insulation sizing material flow channel;
701-support flange, 702-left support roller and 703-right support roller.
The present invention will be explained in further detail with reference to examples.
Detailed Description
It is to be understood that the materials, devices, and components referred to in the present invention are, unless otherwise specified, all materials, devices, and components known in the art.
The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention.
Example 1:
the embodiment provides a combustor tube section-end enclosure heat insulation layer integrated extrusion molding system, as shown in fig. 1, which comprises a base 1, an extruder 2 and a combustor shell 3, wherein the combustor shell 3 is of a tube section-end enclosure integral structure, and further comprises a transition sleeve 4, a core mold 5, a core mold adapter flange 6 and a support 7, wherein the extruder 2, the transition sleeve 4, the core mold 5, the combustor shell 3, the core mold adapter flange 6 and the support 7 are sequentially and coaxially arranged from left to right;
a slide rail 9 is laid on the base 1, an extruder 2 is fixedly mounted on the base 1 at the left end of the slide rail 9, a first center frame 10, a second center frame 11 and a sliding base 12 which can slide on the slide rail 9 are sequentially mounted on the slide rail 9 from left to right, the core mold 5 is supported by the first center frame 10, the combustion chamber shell 3 is supported by the second center frame 11, and the support 7 is supported by the sliding base 12;
the extruder 2 comprises an extrusion cylinder 201, the top of the left end of the extrusion cylinder 201 is provided with a hopper 202, an extrusion screw 203 is arranged in the extrusion cylinder 201, and the right end of the extrusion cylinder 201 is open;
the core mold 5 comprises a metal pipe body 501, a left shaft head 502 is arranged at the left end of the metal pipe body 501, a right shaft head 503 is arranged at the right end of the metal pipe body 501, the left shaft head 502 is installed at the right end of the extrusion screw 203 through a bearing, and a butt joint blind hole 504 is axially arranged on the right shaft head 503; the outer diameter of the core mold 5 is smaller than the inner diameter of the combustion chamber housing 3, and the outer profile of the core mold 5 is consistent with the designed inner profile of the heat insulating layer 16; a mandrel left flange 505 is arranged at the left part of the metal pipe body 501; a plurality of heat insulation rubber material flowing channels 506 are arranged on the core mold left flange 505;
a transition sleeve left flange 401 is arranged at the left end of the transition sleeve 4, a transition sleeve right flange 402 is arranged at the right end of the transition sleeve 4, the transition sleeve left flange 401 is connected with the right end of the extrusion cylinder 201 of the extruder 2, and the transition sleeve right flange 402 is connected with a mandrel left flange 505; the left part of the core mould 5 and the transition sleeve 4 are both in a conical cylinder structure, and an annular gap 403 is formed between the transition sleeve 4 and the core mould 5;
a shell transfer left flange 301 is arranged at the left end of the combustion chamber shell 3, a shell transfer right flange 302 is arranged at the right end of the combustion chamber shell 3, and an overflow hole 303 is arranged on the shell transfer right flange 302;
a support flange 701 is arranged on the left side of the support 7;
the combustion chamber shell structure further comprises a butt joint rod 8, the butt joint rod 8 sequentially penetrates through the support 7, the core mold adapter flange 6 and the combustion chamber shell 3, the left end of the butt joint rod 8 is installed in the butt joint blind hole 504 of the core mold 5, and the right end of the butt joint rod 8 is supported by the support 7 and extends out of the support 7.
As a preferable solution of this embodiment, the left and right sides of the support 7 are respectively provided with a left support roller 702 and a right support roller 703. The left support roller 702 and the right support roller 703 are used for assisting the support 7 to clamp and convey the docking rod 8.
As a preferable mode of this embodiment, the first steady 10 is provided with a supporting roller 13 which is in contact with the core mold 5. Relative movement between the first steady 10 and the core mold 5 is facilitated.
As a preferable configuration of this embodiment, there are one first center frame 10 and two second center frames 11. The two second centerframes 11 are better able to support the combustion chamber housing 3.
As a preferable scheme of this embodiment, the heat insulating layer 16 uses a heat insulating rubber material that is a silicone rubber-based composite material, an ethylene propylene diene monomer rubber-based composite material, or a nitrile rubber-based composite material.
In a preferred embodiment of the present invention, the butt rod 8 is an elongated metal rod or pipe, the length of the butt rod 8 is about 2 to 2.5 times the length of the combustion chamber housing 3, and the butt rod is made of heat-treated 45# steel or 40Cr steel.
Example 2:
the embodiment provides a combustion chamber cylinder section-end socket heat insulation layer integrated extrusion molding method, which adopts the combustion chamber cylinder section-end socket heat insulation layer integrated extrusion molding system in the embodiment 1;
the method specifically comprises the following steps:
step one, a preparation stage:
as shown in fig. 1, the inner wall of the combustor casing 3 is polished to be rough and clean, a casing adapter left flange 301 and a casing adapter right flange 302 are installed, a transition sleeve left flange 401 is connected with the right end of an extrusion cylinder 201, a left spindle nose 502 of a core mold 5 is installed at the right end of an extrusion screw 203 through a bearing, a transition sleeve right flange 402 is connected with a core mold left flange 505, the right end of the core mold 5 is supported by a first center frame 10, and the combustor casing 3 is supported by a second center frame 11; the butt joint rod 8 sequentially passes through the support 7, the core mold adapter flange 6 and the combustion chamber shell 3, and the left end of the butt joint rod 3 is installed in the butt joint blind hole 504 of the core mold 5;
preferably, the abrasive roughening is replaced by grit blasting.
Preferably, after rough grinding and cleaning, an adhesive primer is applied to the inner wall of the combustion chamber housing 3.
Step two, a mould-shell butt joint stage:
sliding the first center frame 10, the second center frame 11 and the sliding base 12 together leftward to drive the combustion chamber shell 3, the core mold adapter flange 6 and the support 7 to move leftward simultaneously until the right spindle nose 503 of the core mold 5 extends out of the shell adapter right flange 302; the first center frame 10 is removed, the second center frame 11 and the sliding base 12 continue to move leftwards until the right spindle nose 503 of the core mold 5 completely extends into the core mold adapter flange 6, and the right spindle nose 503 of the core mold 5 is connected and fastened with the core mold adapter flange 6; connecting the core mold adapter flange 6 with the support flange 701, and removing the butt joint rod 8; adjusting the position of the combustor shell 3 to enable the shell adapter left flange 301 to be in butt joint with the core mold left flange 505; locking the second central frame 11 and the sliding base 12 so that the second central frame cannot slide on the sliding rail 9;
preferably, the right stub shaft 503 of the core mold 5 is fastened to the core mold adapter flange 6 by screws.
Preferably, after the right stub 503 of the core mold 5 is connected and fastened with the core mold adapter flange 6, the left support roller 702 is removed.
Step three, the extrusion molding stage:
as shown in fig. 2, the extruder 2 is started, the heat-insulating rubber material is continuously fed into the hopper 202, the heat-insulating rubber material sequentially passes through the extruder 2 and the transition sleeve 4 to enter the gap between the core mold 5 and the combustion chamber housing 3, and when the heat-insulating rubber material is gradually filled in the gap and the overflow hole 303 on the housing transfer right flange 302 continuously stabilizes the overflow, the feeding and the extrusion are synchronously stopped;
step four, disassembling and post-processing:
the second center frame 11 and the sliding base 12 are unlocked to be capable of sliding on the sliding rails 9, and after the core mold left flange 505 and the transition sleeve right flange 402 are disassembled, the core mold 5, the combustor shell 3 and the support 7 which are sleeved together are pushed rightwards together; a cover flange 17 is arranged on the shell transfer left flange 301 to plug and solidify heat insulation rubber; and then the core mold adapter flange 6 and the support flange 701, and the core mold adapter flange 6 and the right spindle nose 503 of the core mold 5 are sequentially disassembled, the clamping of the second center frame 11 is removed, the core mold-shell assembly 14 shown in fig. 3 is transported to a curing furnace for curing, the core mold 5 is withdrawn after the curing and cooling are finished, the shell adapter left flange 301 and the shell adapter right flange 302 are removed, and the combustion chamber shell 15 with the heat insulation layer formed by extrusion molding of the combustion chamber barrel section and the end socket heat insulation layer is obtained after the shaping.
Application example:
the invention is further explained by taking a combustion chamber shell with the outer shape of 360mm multiplied by 700mm and the inner diameter of the opening at the sealing end of 180mm as a test object and taking a heat insulating layer test piece with the inner diameter of 330mm and the thickness of 12mm as an example.
A silicone rubber-based insulating compound is prepared having a solids content of about 55% to 70%.
The application example follows the combustion chamber cylinder section-end socket heat insulation layer integrated extrusion molding method in the embodiment 2, and the combustion chamber shell with the heat insulation layer formed by the combustion chamber cylinder section-end socket heat insulation layer integrated extrusion molding is obtained, as shown in fig. 4.
The results of DR and section flaw detection by 15MV industrial CT show that the internal quality of the heat insulating layer is good and the adhesion of the heat insulating layer and the shell is good in the integral molding test piece of the cylinder section-end enclosure heat insulating layer as shown in figure 5, which shows that the integral molding method of the cylinder section-end enclosure heat insulating layer provided by the invention is reliable.
Claims (1)
1. An integrated extrusion molding method of a combustion chamber cylinder section-end enclosure heat insulation layer adopts an integrated extrusion molding system of the combustion chamber cylinder section-end enclosure heat insulation layer; the combustor cylinder section-end enclosure heat insulation layer integrated extrusion molding system comprises a base (1), an extruder (2) and a combustor shell (3), wherein the combustor shell (3) is of a cylinder section-end enclosure integral structure, and is characterized by further comprising a transition sleeve (4), a core mold (5), a core mold adapter flange (6) and a support (7), wherein the extruder (2), the transition sleeve (4), the core mold (5), the combustor shell (3), the core mold adapter flange (6) and the support (7) are coaxially arranged from left to right in sequence;
a slide rail (9) is laid on the base (1), an extruder (2) is fixedly mounted on the base (1) at the left end of the slide rail (9), a first center frame (10), a second center frame (11) and a sliding base (12) which can slide on the slide rail (9) are sequentially mounted on the slide rail (9) from left to right, the core mold (5) is supported by the first center frame (10), the combustion chamber shell (3) is supported by the second center frame (11), and the support (7) is supported by the sliding base (12);
the extruder (2) comprises an extrusion cylinder (201), the top of the left end of the extrusion cylinder (201) is provided with a hopper (202), an extrusion screw (203) is arranged in the extrusion cylinder (201), and the right end of the extrusion cylinder (201) is open;
the mandrel (5) comprises a metal pipe body (501), a left shaft head (502) is arranged at the left end of the metal pipe body (501), a right shaft head (503) is arranged at the right end of the metal pipe body (501), the left shaft head (502) is installed at the right end of the extrusion screw (203) through a bearing, and a butt joint blind hole (504) is formed in the right shaft head (503) along the axial direction; the outer diameter of the core mold (5) is smaller than the inner diameter of the combustor shell (3), and the outer profile of the core mold (5) is consistent with the designed inner profile of the heat insulation layer (16); a mandrel left flange (505) is arranged at the left part of the metal pipe body (501); an annular channel (506) for heat insulation rubber to pass through is arranged on the left flange (505) of the core mold;
a transition sleeve left flange (401) is arranged at the left end of the transition sleeve (4), a transition sleeve right flange (402) is arranged at the right end of the transition sleeve (4), the transition sleeve left flange (401) is connected with the right end of an extrusion cylinder (201) of the extruder (2), and the transition sleeve right flange (402) is connected with a core mold left flange (505); the left part of the core mould (5) and the transition sleeve (4) are both in a conical barrel structure, and an annular gap (403) is formed between the transition sleeve (4) and the core mould (5);
a shell transfer left flange (301) is arranged at the left end of the combustion chamber shell (3), a shell transfer right flange (302) is arranged at the right end of the combustion chamber shell (3), and an overflow hole (303) is formed in the shell transfer right flange (302);
a support flange (701) is arranged on the left side of the support (7);
the device is characterized by further comprising a butt joint rod (8), wherein the butt joint rod (8) sequentially penetrates through the support (7), the core mold adapter flange (6) and the combustion chamber shell (3), the left end of the butt joint rod (8) is installed in a butt joint blind hole (504) of the core mold (5), and the right end of the butt joint rod (8) is supported by the support (7) and extends out of the support (7);
the left side and the right side of the support (7) are respectively provided with a left supporting roller (702) and a right supporting roller (703);
the first central frame (10) is provided with a supporting roller (13) which is contacted with the core mould (5);
the number of the first center frames (10) is one, and the number of the second center frames (11) is two;
the heat insulation layer (16) adopts heat insulation rubber materials which are silicon rubber-based composite materials, ethylene propylene diene monomer rubber-based composite materials or nitrile butadiene rubber-based composite materials;
the butt joint rod (8) is a slender metal rod or pipe, the length of the butt joint rod (8) is 2-2.5 times of that of the combustion chamber shell (3), and the butt joint rod is made of heat-treated 45# steel or 40Cr steel;
the method specifically comprises the following steps:
step one, a preparation stage:
the inner wall of a combustion chamber shell (3) is polished roughly and cleaned cleanly, a shell switching left flange (301) and a shell switching right flange (302) are installed, a transition sleeve left flange (401) is connected with the right end of an extrusion cylinder (201), a left shaft head (502) of a core mold (5) is installed at the right end of an extrusion screw (203) through a bearing, a transition sleeve right flange (402) is connected with a core mold left flange (505), the right end of the core mold (5) is supported through a first center frame (10), and the combustion chamber shell (3) is supported through a second center frame (11); the butt joint rod (8) sequentially penetrates through the support (7), the core mold adapter flange (6) and the combustion chamber shell (3), and the left end of the butt joint rod (3) is installed in a butt joint blind hole (504) of the core mold (5);
in the first step, the rough grinding can be replaced by sand blasting;
in the first step, after rough polishing and cleaning, coating adhesive primer on the inner wall of the combustion chamber shell (3);
step two, a mould-shell butt joint stage:
sliding a first center frame (10), a second center frame (11) and a sliding base (12) leftwards together to drive a combustion chamber shell (3), a core mold adapter flange (6) and a support (7) to move leftwards simultaneously until a right shaft head (503) of a core mold (5) extends out of a shell adapter right flange (302); the first center frame (10) is disassembled, the second center frame (11) and the sliding base (12) continue to move leftwards until the right shaft head (503) of the core mold (5) completely extends into the core mold adapter flange (6), and the right shaft head (503) of the core mold (5) is connected and fastened with the core mold adapter flange (6); connecting the core mold adapter flange (6) with the support flange (701), and removing the butt joint rod (8); adjusting the position of the combustor shell (3) to enable a shell switching left flange (301) to be in butt joint with a core mold left flange (505); locking the second center frame (11) and the sliding base (12) so that the second center frame cannot slide on the sliding rail (9);
in the second step, a right shaft head (503) of the core mold (5) is connected and fastened with a core mold adapter flange (6) through a screw;
in the second step, after a right shaft head (503) of the core mold (5) is connected and fastened with a core mold adapter flange (6), a left support roller (702) is detached;
step three, the extrusion molding stage:
starting the extruder (2), continuously feeding heat-insulating rubber material into the hopper (202), allowing the heat-insulating rubber material to sequentially pass through the extruder (2) and the transition sleeve (4) and enter a gap between the core mold (5) and the combustion chamber shell (3), and when the heat-insulating rubber material is gradually filled in the gap, synchronously stopping feeding and stopping extrusion after the overflow hole (303) in the shell switching right flange (302) continuously stabilizes overflow;
step four, disassembling and post-processing:
the second center frame (11) and the sliding base (12) are unlocked to be capable of sliding on the sliding rail (9), and after the core mold left flange (505) and the transition sleeve right flange (402) are disassembled, the core mold (5), the combustion chamber shell (3) and the support (7) which are sleeved together are pushed rightwards together; a cover flange (17) is arranged on the shell switching left flange (301) to plug and solidify heat insulation rubber material; and then sequentially disassembling the core mold adapter flange (6) and the support flange (701) and the core mold adapter flange (6) and the right shaft head (503) of the core mold (5), disassembling the clamp of the second center frame (11), transferring the core mold-shell suite (14) to a curing furnace for curing, withdrawing the core mold (5) after curing and cooling are completed, disassembling the shell adapter left flange (301) and the shell adapter right flange (302), and shaping to obtain the combustor shell (15) with the heat insulation layer formed by extruding and injecting the combustor barrel section-end enclosure heat insulation layer.
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| CN202011186122.6A CN112497699B (en) | 2020-10-30 | 2020-10-30 | Integrated extrusion molding system and method for combustion chamber cylinder section-end enclosure heat insulation layer |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2013183307A1 (en) * | 2012-06-08 | 2016-01-28 | 本田技研工業株式会社 | Fuel injection device |
| CN108488005A (en) * | 2018-02-13 | 2018-09-04 | 重庆大学 | A kind of multiple-pulse solid propellant rocket of thrust controllable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL276858B2 (en) * | 2018-02-24 | 2023-11-01 | Arkal Automotive C S Ltd | Structural member and/or coupling arrangement and/or method for same |
| CN209971463U (en) * | 2019-06-01 | 2020-01-21 | 广东宝通玻璃钢有限公司 | Forming structure of inner layer film of thermoplastic glass fiber reinforced pipe |
| CN111070560B (en) * | 2019-12-26 | 2021-09-07 | 湖北航天化学技术研究所 | Injection or injection-compression molding tool and process for heat insulation layer of combustion chamber of solid rocket engine |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2013183307A1 (en) * | 2012-06-08 | 2016-01-28 | 本田技研工業株式会社 | Fuel injection device |
| CN108488005A (en) * | 2018-02-13 | 2018-09-04 | 重庆大学 | A kind of multiple-pulse solid propellant rocket of thrust controllable |
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