CN115946371A - Method for forming shell with ablation layer on inner surface and asymmetric seal head - Google Patents
Method for forming shell with ablation layer on inner surface and asymmetric seal head Download PDFInfo
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Abstract
The invention discloses a shell forming method with an ablation layer on the inner surface and an asymmetric end enclosure, which relates to the technical field of composite material forming and comprises the steps of assembling a die with the asymmetric end enclosure, manufacturing the ablation resistant layer, winding, forming, curing and demoulding to obtain a shell with the ablation layer on the inner surface and the asymmetric end enclosure; the forming process is simple, the forming efficiency is high, the cost is low, the mechanical property of the material is high, and the method is suitable for batch production; the ablation-resistant layer of the rocket projectile engine shell is formed by adopting the boron phenolic resin and the high silica glass fiber cloth, the ablation-resistant layer is uniform, the carbon forming rate is high, the strength is high, the ablation resistance is good, and the problems of poor erosion resistance and bubbling of the traditional ablation-resistant coating, uneven thickness of an ethylene propylene diene monomer rubber layer, poor smoothness of the inner surface, bubbling and the like are solved.
Description
Technical Field
The invention relates to the technical field of composite material forming, in particular to a method for forming a shell with an ablation layer on the inner surface and an asymmetric end enclosure.
Background
The ablation-resistant shell is generally used on rocket projectile engines, the traditional rocket projectile shell is provided with a metal lining, and then the inner surface of the traditional rocket projectile shell is coated with a layer of ablation-resistant coating or is formed by laying ethylene propylene diene monomer rubber. And the traditional ablation-resistant coating has the problems of poor scouring resistance and bubbling, and the ethylene propylene diene monomer has the problems of uneven layer thickness, poor inner surface finish and bubbling, so that the existing ablation-resistant shell has low mechanical property, poor high temperature resistance, low molding efficiency and high labor intensity, and cannot meet the requirements of rocket projectile engines.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a shell forming method with an ablation layer on the inner surface and an asymmetric end socket.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for forming a shell with an ablation layer on the inner surface and an asymmetric seal head comprises the following steps:
(1) assembling a die with an asymmetric end enclosure;
(2) manufacturing an ablation-resistant layer: coating a release agent on a mold, winding a layer of PTFE tape on the mold, coating a layer of release agent on the PTFE tape, then uniformly coating boron phenolic resin on the mold in sequence, laying a layer of high silica glass fiber cloth, coating a boron phenolic resin glue solution on the high silica glass fiber cloth by using a brush, winding a layer of high silica glass fiber yarn for soaking the boron phenolic resin on the boron phenolic resin, putting the boron phenolic resin-soaked high silica glass fiber yarn into a curing furnace, curing for 0.5 to 1 hour at 75 to 85 ℃, and curing for 1 to 2 hours at the temperature of 155 to 165 ℃ to obtain an ablation-resistant layer;
(3) winding, forming and curing: installing a mould on a winding machine, pouring medium-temperature cured resin glue solution into a glue groove, leading high-strength glass fiber yarns out of a tensioner, passing through a glue dipping groove, winding the high-strength glass fiber yarns onto a mould core mould through a winding trolley in a strand dividing manner, adjusting the tension, winding the high-strength glass fiber yarns to the expected thickness of 5mm, putting the high-strength glass fiber yarns into a curing furnace, connecting the mould with a rotating device in the curing furnace through a connecting structure in the curing furnace, closing a furnace cover, starting the winding machine, and performing rotary curing to obtain a shell with an ablation layer on the inner surface and an asymmetric seal head; the curing parameters are that the rotating speed in the rotating curing process is 30-50 r/min, the curing is firstly carried out for 1-1.5 hours at 75-85 ℃, and the curing is carried out for 1-2 hours when the temperature is raised to 115-125 ℃;
(4) and demolding to obtain the shell with an ablation layer on the inner surface and an asymmetric end enclosure.
Preferably, the mold with the asymmetric end socket comprises a support core shaft and a core shaft, wherein one end of the support core shaft is provided with a positioning hole, one end of the core shaft is provided with a positioning column, the diameter of the positioning column is smaller than that of the core shaft, and the positioning column is in inserting fit with the positioning hole;
a first positioning ring and a first baffle ring are arranged on the supporting mandrel, the first baffle ring is positioned on one side of the first positioning ring close to the positioning hole, and a first positioning jackscrew is arranged on the first positioning ring;
a first shell sealing head is arranged between the support mandrel and the mandrel, a through hole matched with a positioning column at the end part of the mandrel is formed in the first shell sealing head, and the positioning column penetrates through the through hole;
the mandrel is provided with a spliced inner die, a second shell head, a second retaining ring and a second positioning ring, the spliced inner die is located between the first shell head and the second shell head, the spliced inner die is formed by splicing a plurality of modules distributed around the mandrel, the second retaining ring is located between the second shell head and the second positioning ring, and a second positioning jackscrew is arranged on the second positioning ring.
Preferably, all set up 3 at least adjusting bolt on first position circle and the second position circle, adjusting bolt passes the position circle to with position circle screw-thread fit, each adjusting bolt all along the position circle border evenly distributed that corresponds separately.
Preferably, the process of assembling the mold with the asymmetric end socket is as follows:
installing a first positioning ring on a support mandrel, connecting a first baffle ring, and screwing a first positioning jackscrew to fix the first positioning ring on the support mandrel;
mounting a first shell end socket on a positioning column at the end part of the mandrel, mounting the positioning column in a positioning hole, and then assembling the spliced inner die on the mandrel;
installing a second shell end socket, a second baffle ring and a second positioning ring on the core shaft, screwing a positioning bolt, and fixing the second positioning ring on the core shaft;
the further demolding procedure was as follows:
loosening the second positioning bolt, taking the second baffle ring and the second positioning ring off the mandrel, and then taking the mandrel off; loosening the first positioning jackscrew, taking down the second positioning ring, the second baffle ring and the support mandrel; and (4) taking out the spliced inner die from the inner hole formed after the mandrel is pulled out, and taking out the spliced inner die to obtain the shell with the ablation layer on the inner surface and the asymmetric seal head.
Preferably, the release agent is prepared from dimethyl silicone oil, liquid paraffin and toluene according to a mass ratio of 5:1 to 3:2 to 4 are mixed to obtain the product.
Preferably, the boron phenolic resin glue solution is prepared from boron phenolic resin, mica, KH550 coupling agent and industrial alcohol according to a mass ratio of 7-8: 2 to 3:0.1 to 0.3:10 are mixed to obtain the product.
Preferably, the medium-temperature curing resin glue solution is prepared from AG-80 epoxy resin, E-51 epoxy resin, 701 flame retardant, antimony trioxide and diaminodiphenylmethane modified dicyandiamide according to a mass ratio of 6-8: 5:1 to 2:1 to 2: 5-7, mixing;
the diaminodiphenylmethane modified dicyandiamide is prepared by mixing diaminodiphenylmethane and dicyandiamide in a mass ratio of 200:180 to 270.
Compared with the prior art, the invention has the following advantages:
the method for molding the shell with the ablation layer on the inner surface and the asymmetric end enclosure has the advantages of simple molding process, high molding efficiency, low cost, high mechanical properties of materials, suitability for automatic operation and batch production, and suitability for molding the shell which is difficult to demold by a conventional method; the ablation-resistant layer of the rocket shell is formed by adopting boron phenolic resin and high silica glass fiber cloth, the ablation-resistant layer is uniform, the carbon forming rate is high, the strength is high, the ablation resistance is good, and the problems of poor erosion resistance and bubbling of the traditional ablation-resistant coating, uneven thickness of an ethylene propylene diene monomer rubber layer, poor smoothness of the inner surface, bubbling and the like are solved. The medium-temperature curing epoxy resin and the high-temperature resistant epoxy resin are adopted, the energy consumption is reduced, the production efficiency is improved, the performance loss of various materials in the shell under the high-temperature curing is avoided, the mechanical property of the winding layer is high, and the fiber strength exertion rate reaches more than 97%.
The mould adopted by the invention is of a metal petal mould combined structure, the ablation resistant layer is manufactured on the metal petal mould, after winding, forming and curing, the metal petal mould is drawn out from two ends of the shell, and then the mould is combined for reuse, so that the size deformation of the shell can be effectively controlled, the inner surface quality of the shell is high, the coaxiality and the roundness are good, the quality consistency is good, the forming efficiency is high, and the problems of low size precision, low production efficiency and high labor intensity after the traditional sand mould is formed are solved.
Drawings
FIG. 1 is a cross-sectional view of a mold for a shell having an ablation layer on the inner surface and an asymmetric seal head;
FIG. 2 is a left side view of the inner spliced mold;
FIG. 3 is a cross-sectional view of a split inner mold;
FIG. 4 is a cross-sectional view of the first retaining ring;
FIG. 5 is a left side view of the first positioning collar;
FIG. 6 is a schematic structural view of a housing with an ablation-resistant layer on the inner surface and an asymmetric end enclosure after winding, molding and curing;
fig. 7 is a schematic structural view of the shell with an asymmetric end enclosure and an ablation-resistant layer on the inner surface after demolding.
Reference numerals:
the anti-ablation device comprises a supporting mandrel 1, a first positioning ring 2, a first retaining ring 3, a first shell end socket 4, a positioning hole 5, a spliced inner die 6, a mandrel 7, a second shell end socket 8, a second retaining ring 9, a second positioning jackscrew 10, an adjusting bolt 11, a first metal petal die 12, a second metal petal die 13, an ablation-resistant layer 14, a die shell 15, a die shell 16, a through hole 17, a second positioning ring 18, a first positioning jackscrew 19 and a positioning column 20.
Detailed Description
The invention aims to provide a shell forming method with an ablation layer on the inner surface and an asymmetric seal head, which is realized by the following technical scheme:
the invention is further described with reference to specific examples.
The high silica glass fiber yarn can be selected from the products produced by the following manufacturers: nanjing Long-March glass fiber Co., ltd, luoyangsendui glass fiber Co., ltd, or Satsu-named Sakuai high silica glass fiber products Co., ltd.
The high-strength glass fiber yarn can be selected from the products produced by the following manufacturers: nanjing glass fiber research design institute, inc., jiangsu Zhengwei New Material or Chongqing International composite materials, inc.
Example 1
A method for forming a shell with an ablation layer on the inner surface and an asymmetric end enclosure comprises the following steps:
(1) assembling a die with an asymmetric end enclosure;
(2) manufacturing an ablation-resistant layer: coating a release agent on a mold, winding a layer of PTFE tape on the mold, coating a layer of release agent on the PTFE tape, then uniformly coating boron phenolic resin on the mold in sequence, laying a layer of high silica glass fiber cloth, coating a boron phenolic resin glue solution on the high silica glass fiber cloth by using a brush, winding a layer of high silica glass fiber yarn for soaking the boron phenolic resin on the boron phenolic resin, putting the boron phenolic resin-soaked high silica glass fiber yarn into a curing furnace, curing for 0.5 hour at 75 ℃, heating to 155 ℃ and curing for 1 hour to obtain an ablation-resistant layer;
(3) winding, forming and curing: installing a mould on a winding machine, pouring medium-temperature cured resin glue solution into a glue groove, leading high-strength glass fiber yarns out of a tensioner, passing through a glue dipping groove, winding the high-strength glass fiber yarns onto a mould core mould through a winding trolley in a strand dividing manner, adjusting the tension, winding the high-strength glass fiber yarns to the expected thickness of 5mm, putting the high-strength glass fiber yarns into a curing furnace, connecting the mould with a rotating device in the curing furnace through a connecting structure in the curing furnace, closing a furnace cover, starting the winding machine, and performing rotary curing to obtain a shell with an ablation layer on the inner surface and an asymmetric seal head; the curing parameters are that the rotating speed in the rotating curing process is 50 revolutions per minute, the curing is firstly carried out for 1 hour at 85 ℃, and the curing is carried out for 1 hour after the temperature is raised to 115 ℃;
(4) and demolding to obtain the shell with an ablation layer on the inner surface and an asymmetric end enclosure.
Example 2
A method for forming a shell with an ablation layer on the inner surface and an asymmetric seal head comprises the following steps:
(1) assembling a die with an asymmetric end enclosure:
as shown in fig. 1, the mold with the asymmetric end socket comprises a support core shaft 1 and a core shaft 7, wherein one end of the support core shaft 1 is provided with a positioning hole 5, one end of the core shaft 7 is provided with a positioning column 20, the diameter of the positioning column 20 is smaller than that of the core shaft 7, and the positioning column is in inserted fit with the positioning hole 5;
a first positioning ring 2 and a first baffle ring 3 are arranged on the supporting mandrel 1, the first baffle ring 3 is positioned on one side, close to the positioning hole 5, of the first positioning ring 2, and a first positioning jackscrew 19 is arranged on the first positioning ring 2;
a first shell end enclosure 4 is arranged between the support mandrel 1 and the mandrel 7, a through hole 17 matched with a positioning column 20 at the end part of the mandrel 7 is formed in the first shell end enclosure 4, and the positioning column penetrates through the through hole;
the mandrel 7 is provided with a splicing type inner die 6, a second shell end socket 8, a second retaining ring 9 and a second positioning ring 18, the splicing type inner die 6 is positioned between the first shell end socket 4 and the second shell end socket 8, the splicing type inner die 6 is formed by splicing a plurality of modules distributed around the mandrel 7, the second retaining ring 9 is positioned between the second shell end socket 8 and the second positioning ring 18, and the second positioning ring 18 is provided with a second positioning jackscrew 10;
as shown in fig. 2 and 3, the split internal mold 6 is formed by staggering a first metal petal mold 12 and a second metal petal mold 13, so that the split internal mold is convenient to mount and dismount, and labor force is saved;
the specific process for assembling the die with the asymmetric end sockets is as follows:
installing the first positioning ring 2 on the support mandrel 1, connecting the first baffle ring 3, and screwing the first positioning jackscrew 19 to fix the first positioning ring 2 on the support mandrel 1;
installing a first shell end socket 4 on a positioning column at the end part of the mandrel 7, installing the positioning column in a positioning hole 5, and then assembling the spliced inner die 6 on the mandrel 7;
installing a second shell end socket 8, a second retaining ring 9 and a second positioning ring 18 on the mandrel 7, screwing a positioning bolt 10, and fixing the second positioning ring 18 on the mandrel 7;
(2) preparing an ablation resistant layer: coating a release agent on a spliced inner die 6, winding a layer of tetrafluoro belt on the spliced inner die 6, coating a layer of release agent on the tetrafluoro belt, then uniformly coating boron phenolic resin on the die in sequence, laying a layer of high silica glass fiber cloth with the thickness of 0.2mm, coating a boron phenolic resin glue solution on the high silica glass fiber cloth by using a brush, winding a layer of high silica glass fiber yarn for soaking the boron phenolic resin on the boron phenolic resin, putting the boron phenolic resin glue solution into a curing furnace, curing for 0.5 hour at 75 ℃, and curing for 1 hour at 155 ℃ to obtain an anti-ablation layer;
the high silica glass fiber yarn is 1200tex, the tension is controlled at 120N, and the thickness is about 0.4mm;
the release agent is prepared from dimethyl silicone oil, liquid paraffin and toluene according to a mass ratio of 5:1:2, mixing to obtain;
the boron phenolic resin glue solution is prepared from boron phenolic resin, mica, KH550 coupling agent and industrial alcohol according to a mass ratio of 7:2:0.1:10 mixing to obtain;
(3) winding, forming and curing: installing a mould on a winding machine, pouring medium-temperature cured resin glue solution into a glue groove, leading high-strength glass fiber yarns out of a tensioner, passing through a glue dipping groove, winding the high-strength glass fiber yarns onto a mould core mould through a winding trolley in a splitting manner, adjusting the tension, winding the high-strength glass fiber yarns to the expected thickness of 5mm, putting the high-strength glass fiber yarns into a curing furnace, connecting the mould with a rotating device in the curing furnace through a connecting structure in the curing furnace, closing a furnace cover, starting the winding machine, and rotating and curing to obtain a shell with an ablation layer on the inner surface and an asymmetric end enclosure, wherein the shell is shown in figure 6; the curing parameters are that the rotating speed in the rotating curing process is 30-50 r/min, the curing is firstly carried out for 1 hour at 75 ℃, and the curing is carried out for 1 hour at 115 ℃;
the medium-temperature curing resin glue solution is prepared from AG-80 epoxy resin, E-51 epoxy resin, 701 flame retardant, antimony trioxide and diaminodiphenylmethane modified dicyandiamide in a mass ratio of 6:5:1:1:5, mixing to obtain;
the diaminodiphenylmethane modified dicyandiamide is prepared from the following components in percentage by mass: 18 diaminodiphenylmethane and dicyandiamide react for 4 hours at 115 ℃ to obtain the product;
(4) and (3) demolding to obtain the shell with the ablation layer on the inner surface and the asymmetric end socket, as shown in fig. 7, the specific demolding process is as follows:
loosening the second positioning bolt 10, taking the second retainer ring 9 and the second positioning ring 18 off the mandrel 7, and then taking the mandrel 7 off; loosening the first positioning jackscrew 19, and taking down the second positioning ring 2, the second retaining ring 3 and the support mandrel 1; and (3) taking out the spliced inner die 6 from the inner hole formed after the mandrel 7 is pulled out, and taking out the spliced inner die to obtain the shell with the ablation layer on the inner surface and the asymmetric end enclosure.
Example 3
A method for forming a shell with an ablation layer on the inner surface and an asymmetric seal head comprises the following steps:
(1) assembling a die with an asymmetric end enclosure:
as shown in fig. 1, the mold with the asymmetric end socket comprises a support core shaft 1 and a core shaft 7, wherein one end of the support core shaft 1 is provided with a positioning hole 5, one end of the core shaft 7 is provided with a positioning column 20, the diameter of the positioning column 20 is smaller than that of the core shaft 7, and the positioning column is in inserted fit with the positioning hole 5;
a first positioning ring 2 and a first baffle ring 3 are arranged on the supporting mandrel 1, the first baffle ring 3 is positioned on one side, close to the positioning hole 5, of the first positioning ring 2, and a first positioning jackscrew 19 is arranged on the first positioning ring 2;
a first shell end socket 4 is arranged between the support mandrel 1 and the mandrel 7, a through hole 17 matched with a positioning column 20 at the end part of the mandrel 7 is formed in the first shell end socket 4, and the positioning column penetrates through the through hole;
the mandrel 7 is provided with a splicing type inner die 6, a second shell end socket 8, a second retaining ring 9 and a second positioning ring 18, the splicing type inner die 6 is positioned between the first shell end socket 4 and the second shell end socket 8, the splicing type inner die 6 is formed by splicing a plurality of modules distributed around the mandrel 7, the second retaining ring 9 is positioned between the second shell end socket 8 and the second positioning ring 18, and a second positioning jackscrew 10 is arranged on the second positioning ring 18; as shown in fig. 4 and 5, at least 3 adjusting bolts 11 are arranged on the first positioning ring 2 and the second positioning ring 18, the adjusting bolts 11 axially penetrate through the positioning rings and are in threaded fit with the positioning rings, and the adjusting bolts are uniformly distributed along the circumference of the corresponding positioning rings;
the specific process for assembling the die with the asymmetric end sockets is as follows:
installing the first positioning ring 2 on the support mandrel 1, connecting the first baffle ring 3, and screwing the first positioning jackscrew 19 to fix the first positioning ring 2 on the support mandrel 1;
installing a first shell end socket 4 on a positioning column at the end part of the mandrel 7, installing the positioning column in a positioning hole 5, and then assembling the spliced inner die 6 on the mandrel 7;
installing a second shell end socket 8, a second retaining ring 9 and a second positioning ring 18 on the mandrel 7, screwing a positioning bolt 10, and fixing the second positioning ring 18 on the mandrel 7;
a plurality of fourth positioning bolts 20 are arranged on the second positioning ring 2, and a plurality of third positioning bolts 11 are arranged on the first positioning ring 18;
(2) manufacturing an ablation-resistant layer: coating a release agent on a mold, winding a layer of PTFE tape on the mold, coating a layer of release agent on the PTFE tape, then uniformly coating boron phenolic resin on the mold in sequence, laying a layer of high silica glass fiber cloth, coating a boron phenolic resin glue solution on the high silica glass fiber cloth by using a brush, winding a layer of high silica glass fiber yarn for soaking the boron phenolic resin on the boron phenolic resin, putting the boron phenolic resin-soaked high silica glass fiber yarn into a curing furnace, curing for 1 hour at 85 ℃, and curing for 2 hours at 165 ℃ to obtain an ablation-resistant layer;
the release agent is obtained by mixing dimethyl silicone oil, liquid paraffin and toluene according to the mass ratio of 5: 3: 4;
the boron phenolic resin glue solution is prepared by mixing boron phenolic resin, mica, KH550 coupling agent and industrial alcohol according to the mass ratio of 8: 3: 0.3: 10;
(3) winding, forming and curing: installing a mould on a winding machine, pouring medium-temperature curing resin glue solution into a glue tank, leading high-strength glass fiber yarns out of a tensioner, passing through a glue dipping tank, winding the high-strength glass fiber yarns onto a mould core mould through a winding trolley tow separating device, starting a winding program to start winding when the high-strength glass fiber yarns are wound onto the mould core mould through the winding trolley tow separating device, wherein the width of each yarn sheet is 10mm, the tension is 150N, and the longitudinal winding angle is 650,3 cut points; after the winding thickness is 1.5 mm; adjusting the technological parameters of 10mm of width of the yarn sheet, 120N of tension, winding in the circumferential direction, and after the winding thickness is 1.5 mm; adjusting the process parameters of 12mm of width of the yarn sheet, 100N of tension, 550,5 tangent points of longitudinal winding angle and 1.5mm of winding thickness; adjusting the technological parameters of 12mm of width of the yarn sheet and 80N of tension, and winding in a circular direction until the yarn sheet is wound to the expected thickness of 5mm;
the medium-temperature curing resin glue solution is prepared by mixing AG-80 epoxy resin, E-51 epoxy resin, 701 flame retardant, antimony trioxide and diaminodiphenylmethane modified dicyandiamide according to the mass ratio of 8:5: 2: 7;
the diaminodiphenylmethane modified dicyandiamide is obtained by reacting diaminodiphenylmethane and dicyandiamide in a mass ratio of 20: 27 at 125 ℃ for 5 hours;
putting the wound shell into a curing furnace, connecting the mold with a rotating device in the curing furnace through a connecting structure in the curing furnace, closing a furnace cover, starting a winding machine, and rotating and curing to obtain the shell with an ablation layer on the inner surface and an asymmetric seal head; the curing parameters are that the rotating speed in the rotating curing process is 50 revolutions per minute, the curing is firstly carried out for 1.5 hours at 85 ℃, and the curing is carried out for 2 hours when the temperature is raised to 125 ℃;
(4) and demolding to obtain the shell with an ablation layer on the inner surface and an asymmetric end enclosure, wherein the specific demolding process comprises the following steps: loosening the second positioning bolt 10, taking the second retainer ring 9 and the second positioning ring 18 off the mandrel 7, and then taking the mandrel 7 off; loosening the first positioning jackscrew 19, and taking down the second positioning ring 2, the second retaining ring 3 and the support mandrel 1; and (3) taking out the spliced inner die 6 from the inner hole formed after the mandrel 7 is pulled out, and obtaining the shell with the ablation layer on the inner surface and the asymmetric end enclosure.
Example 4
A method for forming a shell with an ablation layer on the inner surface and an asymmetric end enclosure comprises the following steps:
(1) assembling a die with an asymmetric end enclosure:
as shown in fig. 1, the mold with the asymmetric sealing head comprises a supporting mandrel 1 and a mandrel 7, wherein a positioning hole 5 is formed in one end of the supporting mandrel 1, a positioning column 20 is arranged at one end of the mandrel 7, the diameter of the positioning column 20 is smaller than that of the mandrel 7, and the positioning column is in inserted fit with the positioning hole 5; a first positioning ring 2 and a first baffle ring 3 are arranged on the supporting mandrel 1, the first baffle ring 3 is positioned on one side, close to the positioning hole 5, of the first positioning ring 2, and a first positioning jackscrew 19 is arranged on the first positioning ring 2; a first shell end enclosure 4 is arranged between the support mandrel 1 and the mandrel 7, a through hole 17 matched with a positioning column 20 at the end part of the mandrel 7 is formed in the first shell end enclosure 4, and the positioning column penetrates through the through hole; the mandrel 7 is provided with a splicing type inner die 6, a second shell end socket 8, a second retaining ring 9 and a second positioning ring 18, the splicing type inner die 6 is positioned between the first shell end socket 4 and the second shell end socket 8, the splicing type inner die 6 is formed by splicing a plurality of modules distributed around the mandrel 7, the second retaining ring 9 is positioned between the second shell end socket 8 and the second positioning ring 18, and the second positioning ring 18 is provided with a second positioning jackscrew 10;
the specific process for assembling the die with the asymmetric end sockets is as follows:
installing the first positioning ring 2 on the support mandrel 1, connecting the first baffle ring 3, and screwing the first positioning jackscrew 19 to fix the first positioning ring 2 on the support mandrel 1; a first shell end socket 4 is arranged on a positioning column at the end part of the mandrel 7, the positioning column is arranged in a positioning hole 5, and then the spliced inner die 6 is assembled on the mandrel 7; a second shell end socket 8, a second retainer ring 9 and a second positioning ring 18 are arranged on the mandrel 7, and a positioning bolt 10 is screwed to fix the second positioning ring 18 on the mandrel 7;
a plurality of fourth positioning bolts 20 are arranged on the second positioning ring 2, and a plurality of third positioning bolts 11 are arranged on the first positioning ring 18;
(2) preparing an ablation resistant layer: coating a release agent on a mold, winding a layer of teflon tape on the mold, coating a layer of release agent on the teflon tape, then uniformly coating boron phenolic resin on the mold in sequence, laying a layer of high silica glass fiber cloth, coating boron phenolic resin glue solution on the high silica glass fiber cloth by using a brush, winding a layer of high silica glass fiber yarn for soaking the boron phenolic resin on the boron phenolic resin, putting the boron phenolic resin-soaked high silica glass fiber yarn into a curing furnace, curing for 1 hour at 85 ℃, and curing for 2 hours at 165 ℃ to obtain an ablation-resistant layer;
the release agent is obtained by mixing dimethyl silicone oil, liquid paraffin and toluene according to the mass ratio of 5: 2: 3;
the boron phenolic resin glue solution is prepared by mixing boron phenolic resin, mica, KH550 coupling agent and industrial alcohol according to the mass ratio of 8: 2: 0.2: 10;
(3) winding, forming and curing: installing a mould on a winding machine, pouring medium-temperature cured resin glue solution into a glue groove, leading high-strength glass fiber yarns out of a tensioner, passing through a glue dipping groove, winding the high-strength glass fiber yarns onto a mould core mould through a strand dividing bundle of a winding trolley, starting a winding program to start winding when the high-strength glass fiber yarns are wound onto the mould core mould through the strand dividing bundle of the winding trolley, wherein the width of each yarn sheet is 10mm, the tension is 150N, and the longitudinal winding angle is 650,3 cut points; after the winding thickness is 1.5 mm; adjusting the technological parameters of 10mm of width of the yarn sheet, 120N of tension, winding in the circumferential direction, and after the winding thickness is 1.5 mm; adjusting the process parameters of 12mm of width of the yarn sheet, 100N of tension, 550,5 tangent points of longitudinal winding angle and 1.5mm of winding thickness; adjusting the technological parameters of 12mm of width of the yarn sheet and 80N of tension, and winding in a circular direction until the yarn sheet is wound to the expected thickness of 5mm;
the medium-temperature curing resin glue solution is prepared by mixing AG-80 epoxy resin, E-51 epoxy resin, 701 flame retardant, antimony trioxide and diaminodiphenylmethane modified dicyandiamide according to the mass ratio of 7: 5: 1.5: 6;
the diaminodiphenylmethane modified dicyandiamide is obtained by reacting diaminodiphenylmethane and dicyandiamide in a mass ratio of 1:1 at 120 ℃ for 4.5 hours;
putting the wound shell into a curing furnace, connecting the mold with a rotating device in the curing furnace through a connecting structure in the curing furnace, closing a furnace cover, starting a winding machine, and performing rotary curing to obtain the shell with an ablation layer on the inner surface and an asymmetric seal head; the curing parameters are that the rotating speed in the rotating curing process is 50 r/min, the curing is firstly carried out for 1.5 hours at 85 ℃, and the curing is carried out for 2 hours at 125 ℃;
(4) and demolding to obtain the shell with an ablation layer on the inner surface and an asymmetric end enclosure, wherein the specific demolding process comprises the following steps: loosening the second positioning bolt 10, taking the second retainer ring 9 and the second positioning ring 18 off the mandrel 7, and then taking the mandrel 7 off; loosening the first positioning jackscrew 19, and taking down the second positioning ring 2, the second retaining ring 3 and the support mandrel 1; and (3) taking out the spliced inner die 6 from the inner hole formed after the mandrel 7 is pulled out, and obtaining the shell with the ablation layer on the inner surface and the asymmetric end enclosure.
Examples 1-4 were prepared using the same mold, and the shell parameters were as follows: inner diameter of casing
The wall thickness is 5mm, the head is high-strength aluminum alloy material, one end head height 80mm, utmost point hole radius 30mm, other end head height 100mm, utmost point hole radius 45mm, barrel end length 300mm department, the internal surface has the resistant ablation layer of 0.7 mm's boron phenolic aldehyde and the shaping of high silica glass fiber.
The housings having an ablation layer on the inner surface and an asymmetric head obtained in examples 1 to 4 were examined for pressure-bearing strength and the like, and the housing was an ablation-resistant housing having a high-strength aluminum metal liner and an ablation-resistant coating on the inner surface, and the results are shown in table 2.
The properties of the boronovolac resin pastes in examples 2 to 4 are shown in Table 1, and the ablation test was performed with reference to GJB 323A-96.
TABLE 1 Performance results of boron phenolic resin glue solutions in examples 2 to 4
It can be seen that the boron phenolic resin glue solutions of examples 2 to 4 have excellent properties and can meet technical requirements.
Table 2 table of the results of testing the shell having an ablative layer on the inner surface and an asymmetric end cap obtained in examples 1 to 4
The shell with the ablation-resistant layer on the inner surface and the asymmetric end enclosure is uniform in thickness, good in inner surface smoothness and free of bubbling, the shell is easy to demould by adopting a specific demoulding agent, and is particularly suitable for demoulding of a mould with an asymmetric structure, and the results in table 2 show that the shell with the ablation-resistant layer on the inner surface and the asymmetric end enclosure is light in weight, high in pressure-bearing strength and excellent in ablation resistance.
Claims (8)
1. A method for forming a shell with an ablation layer on the inner surface and an asymmetric seal head is characterized in that: the method comprises the following steps:
(1) assembling a mould with an asymmetric end enclosure;
(2) manufacturing an ablation-resistant layer: coating a release agent on a mold, winding a layer of PTFE tape on the mold, coating a layer of release agent on the PTFE tape, then uniformly coating boron phenolic resin on the mold in sequence, laying a layer of high silica glass fiber cloth, coating a boron phenolic resin glue solution on the high silica glass fiber cloth by using a brush, winding a layer of high silica glass fiber yarn for soaking the boron phenolic resin on the boron phenolic resin, putting the boron phenolic resin-soaked high silica glass fiber yarn into a curing furnace, curing for 0.5 to 1 hour at 75 to 85 ℃, and curing for 1 to 2 hours at the temperature of 155 to 165 ℃ to obtain an ablation-resistant layer;
(3) winding, forming and curing: installing a mould on a winding machine, pouring medium-temperature curing resin glue solution into a glue groove, leading high-strength glass fiber yarn out of a tensioner, passing through a glue dipping groove, winding the high-strength glass fiber yarn onto a mould core mould through a winding trolley in a splitting manner, adjusting the tension, winding the high-strength glass fiber yarn to the expected thickness of 5mm, putting the high-strength glass fiber yarn into a curing furnace, connecting the mould with a rotating device in the curing furnace through a connecting structure in the curing furnace, closing a furnace cover, starting the winding machine, and performing rotary curing to obtain a shell with an ablation layer on the inner surface and an asymmetric end enclosure; the curing parameters are that the rotating speed in the rotating curing process is 30-50 r/min, the curing is firstly carried out for 1-1.5 hours at the temperature of 75-85 ℃, and the curing is carried out for 1-2 hours at the temperature of 115-125 ℃;
(4) and demolding to obtain the shell with an ablation layer on the inner surface and an asymmetric end enclosure.
2. The method for forming a shell with an ablation layer on the inner surface and an asymmetric end socket according to claim 1, wherein the method comprises the following steps: the die with the asymmetric seal head comprises a supporting core shaft (1) and a core shaft (7), wherein one end of the supporting core shaft (1) is provided with a positioning hole (5), one end of the core shaft (7) is provided with a positioning column (20), the diameter of the positioning column (20) is smaller than that of the core shaft (7), and the positioning column is in inserting fit with the positioning hole (5);
a first positioning ring (2) and a first baffle ring (3) are arranged on the supporting mandrel (1), the first baffle ring (3) is positioned on one side, close to the positioning hole (5), of the first positioning ring (2), and a first positioning jackscrew (19) is arranged on the first positioning ring (2);
a first shell end enclosure (4) is arranged between the support core shaft (1) and the core shaft (7), a through hole (17) matched with a positioning column (20) at the end part of the core shaft (7) is formed in the first shell end enclosure (4), and the positioning column penetrates through the through hole;
installation concatenation formula centre form (6) on dabber (7), second casing head (8), second fender ring (9) and second position circle (18), concatenation formula centre form (6) are located between first casing head (4) and second casing head (8), concatenation formula centre form (6) are by a plurality of module concatenations of arranging around dabber (7) and are constituteed, second fender ring (9) are located between second casing head (8) and second position circle (18), set up second location jackscrew (10) on second position circle (18).
3. The method of claim 2, wherein the shell has an ablation layer on an inner surface and an asymmetric end socket, and the method comprises the steps of: all set up 3 at least adjusting bolt (11) on first position circle (2) and second position circle (18), adjusting bolt (11) axial passes the position circle to with position circle screw-thread fit, each adjusting bolt all along the position circle border evenly distributed that corresponds separately.
4. The method for forming a shell with an ablation layer on the inner surface and an asymmetric end socket according to claim 2, wherein the method comprises the following steps: the process of assembling the die with the asymmetric end socket is as follows:
the first positioning ring (2) is arranged on the supporting mandrel (1), connected with the first baffle ring (3), and fixed on the supporting mandrel (1) by screwing the first positioning jackscrew (19);
a first shell end socket (4) is arranged on a positioning column at the end part of the mandrel (7), the positioning column is arranged in a positioning hole (5), and then the spliced inner die (6) is assembled on the mandrel (7);
and a second shell end socket (8), a second retaining ring (9) and a second positioning ring (18) are arranged on the mandrel (7), and a positioning bolt (10) is screwed to fix the second positioning ring (18) on the mandrel (7).
5. The method of claim 2, wherein the shell has an ablation layer on an inner surface and an asymmetric end socket, and the method comprises the steps of: the demolding process comprises the following steps:
loosening the second positioning bolt (10), taking the second retainer ring (9) and the second positioning ring (18) off the mandrel (7), and then taking the mandrel (7) off;
loosening the first positioning jackscrew (19), and taking down the second positioning ring (2), the second retaining ring (3) and the support mandrel (1);
and (3) taking out the spliced inner die (6) from the inner hole formed after the mandrel (7) is pulled out, and taking out the spliced inner die to obtain the shell with the ablation layer on the inner surface and the asymmetric seal head.
6. The method of claim 1, further comprising the step of forming a shell having an ablation layer on an inner surface thereof and an asymmetric end enclosure, wherein the method comprises the steps of: the release agent is prepared from dimethyl silicone oil, liquid paraffin and toluene according to a mass ratio of 5:1 to 3:2 to 4 are mixed to obtain the product.
7. The method for forming a shell with an ablation layer on the inner surface and an asymmetric end socket according to claim 1, wherein the method comprises the following steps: the boron phenolic resin glue solution is prepared by mixing boron phenolic resin, mica, KH550 coupling agent and industrial alcohol according to the mass ratio of 7-8: 2-3: 0.1-0.3: 10.
8. The method of claim 1, further comprising the step of forming a shell having an ablation layer on an inner surface thereof and an asymmetric end enclosure, wherein the method comprises the steps of: the medium-temperature curing resin glue solution is obtained by mixing AG-80 epoxy resin, E-51 epoxy resin, 701 flame retardant, antimony trioxide and diaminodiphenylmethane modified dicyandiamide according to the mass ratio of 6-8: 5: 1-2: 5-7;
the diaminodiphenylmethane modified dicyandiamide is obtained by reacting diaminodiphenylmethane and dicyandiamide in a mass ratio of 200: 180-270 at 115-125 ℃ for 4-5 hours.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211545740.4A CN115946371A (en) | 2022-12-01 | 2022-12-01 | Method for forming shell with ablation layer on inner surface and asymmetric seal head |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211545740.4A CN115946371A (en) | 2022-12-01 | 2022-12-01 | Method for forming shell with ablation layer on inner surface and asymmetric seal head |
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| CN202211545740.4A Pending CN115946371A (en) | 2022-12-01 | 2022-12-01 | Method for forming shell with ablation layer on inner surface and asymmetric seal head |
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| Country | Link |
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