CN114103173A - Method for forming cylinder wall of large-size gas flow guide pipe - Google Patents
Method for forming cylinder wall of large-size gas flow guide pipe Download PDFInfo
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- CN114103173A CN114103173A CN202111338777.5A CN202111338777A CN114103173A CN 114103173 A CN114103173 A CN 114103173A CN 202111338777 A CN202111338777 A CN 202111338777A CN 114103173 A CN114103173 A CN 114103173A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000011347 resin Substances 0.000 claims abstract description 48
- 229920005989 resin Polymers 0.000 claims abstract description 48
- 239000006260 foam Substances 0.000 claims abstract description 35
- 239000012779 reinforcing material Substances 0.000 claims abstract description 23
- 238000005470 impregnation Methods 0.000 claims abstract description 18
- 238000009755 vacuum infusion Methods 0.000 claims abstract description 14
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 239000003292 glue Substances 0.000 claims description 62
- 238000002347 injection Methods 0.000 claims description 58
- 239000007924 injection Substances 0.000 claims description 58
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000000465 moulding Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 10
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- 238000005498 polishing Methods 0.000 claims description 3
- 239000012945 sealing adhesive Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 claims description 2
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- 238000013461 design Methods 0.000 abstract description 9
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- 238000005516 engineering process Methods 0.000 abstract description 4
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- 238000001802 infusion Methods 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
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- 238000001879 gelation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
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Images
Classifications
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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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
- B29C70/36—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core and impregnating by casting, e.g. vacuum casting
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
Abstract
The invention discloses a method for forming a cylinder wall of a large-size gas flow guide pipe, wherein the cylinder wall of the gas flow guide pipe is of a sandwich structure and comprises a foam sandwich in the middle, and inner skins and outer skins at the inner side and the outer side, a plurality of flow guide grooves penetrating through a foam core material along the radial direction are arranged on the foam sandwich, the cylinder wall of the gas flow guide pipe is provided with a reinforcing area, and the thickness of the inner skins and the outer skins of the reinforcing area is far larger than that of the inner skins and the outer skins of other areas. The design of a plurality of flow guide grooves which vertically penetrate through a foam core material and flow guide nets combined on a skin laying layer are arranged on the foam sandwich, so that a Z-direction impregnation leading vacuum infusion forming technology is formed, the seepage distance of resin is shortened, the difficult problem of liquid phase forming of a large-size and variable-section composite material plate is solved through the flow guide grooves, the resin is rapidly spread in the surface and downward seeps and infiltrates a reinforcing material, the reinforcing material is dispersed through the flow guide grooves of the core material, and a preformed body is impregnated along the thickness direction, so that uniform impregnation is realized.
Description
Technical Field
The invention relates to the technical field of vacuum infusion, in particular to a method for forming a cylinder wall of a large-size gas flow guide pipe.
Background
For large-size components made of metal materials, a die-casting welding forming mode can be directly adopted for processing, for high-polymer components with higher hardness, a thermoplastic forming method can be adopted, and the technical process is simpler. The key difficulty of the liquid phase method vacuum infusion process technology for forming and preparing the large-size and variable-section carbon-glass hybrid sandwich structure preform is that how to effectively impregnate the large-size and variable-section carbon-glass hybrid sandwich structure preform in one step by liquid resin, and the problems of large difference of permeability characteristics of carbon fibers and glass fibers, complex resin seepage behavior, difficult control of a uniform impregnation process and the like are involved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for forming the cylinder wall of a large-size gas flow guide pipe, which adopts a Z-direction impregnation leading vacuum infusion forming technology to shorten the resin seepage distance and solves the problem of liquid phase forming of a large-size variable-section composite plate through flow passage design.
In order to achieve the purpose, the invention provides a method for forming a cylinder wall of a large-size gas flow guide pipe, wherein the cylinder wall of the gas flow guide pipe is of a sandwich structure and comprises a foam sandwich in the middle, and inner skins and outer skins at the inner side and the outer side, a plurality of flow guide grooves penetrating through the foam sandwich in the radial direction are arranged on the foam sandwich, the cylinder wall of the gas flow guide pipe is provided with a reinforced area, and the thickness of the inner skins and the outer skins of the reinforced area is far greater than that of the inner skins and the outer skins of other areas;
the forming method specifically comprises the following steps:
step 1, preparing a cylinder wall split body: after the surface treatment and detection of the split forming die are finished, laying an outer skin reinforcing material, sandwich foam, an inner skin reinforcing material, a porous isolating membrane, demoulding cloth and a flow guide net component on the split forming die layer by layer; then sealing by adopting a vacuum bag film and a sealing adhesive tape, connecting a vacuum system, vacuumizing and checking the air tightness; after the air tightness is qualified, preparing resin glue solution for vacuum infusion, and then curing and forming to obtain a cylinder wall split body;
and 2, splicing and fixing the cylinder wall split bodies to obtain the cylinder wall of the gas guide pipe.
In one embodiment, in step 1, the flow guide net assembly includes a first flow guide net, a second flow guide net, a first glue injection pipe, a second glue injection pipe and a third glue injection pipe;
the head end of the first current guiding net covers the head end of the inner skin reinforcing material, and the tail end of the first current guiding net is positioned at the head end of the reinforcing area;
the tail end of the second flow guide net covers the tail end of the inner skin reinforcing material, the head end of the second flow guide net covers the reinforcing area, and a blank area is arranged between the head end of the second flow guide net and the tail end of the first flow guide net;
the first glue injection pipe is arranged at the tail end of the first flow guide net, the second glue injection pipe is arranged in the middle of the first flow guide net, and the third glue injection pipe is arranged in the middle of the second flow guide net.
In one embodiment, the width of the enhancement region is a, and the width of the margin is 0.01 a-0.03 a.
In one embodiment, the split forming die comprises a female die body, a forming die cavity is arranged on the female die body, a plurality of air exhaust holes are formed in the top of the female die body, each air exhaust hole circumferentially surrounds the forming die cavity, and the air exhaust holes vertically penetrate through the female die body;
the vacuum infusion forming method comprises the following specific steps:
cleaning the surface of the female die body, sealing holes, polishing, coating a release agent, detecting the molded surface and the air tightness of the die, checking a heating system and a vacuum channel system, and monitoring the temperature and the humidity;
sequentially laying an outer skin reinforcing material, sandwich foam, an inner skin reinforcing material, a porous isolating membrane, demoulding cloth and a flow guide net component in a forming die cavity;
laying a vacuum bag film on the female die body, so that the vacuum bag film covers the molding die cavity and each air suction hole, and sealing the air suction holes by using a semi-permeable film;
connecting each air extraction hole with a vacuumizing device, vacuumizing the vacuum bag film of the sealed die cavity to be vacuum, and checking the air tightness;
injecting resin through the flow guide net assembly, and then curing and forming.
In one embodiment, the resin is injected through the air guide net assembly, specifically:
firstly, injecting resin through a first glue injection pipe;
when the resin is soaked to the second glue injection pipe, the resin is injected through the second glue injection pipe;
when the resin is soaked to the third glue injection pipe, the resin injection through the third glue injection pipe is started.
In one embodiment, during the resin impregnation process, different air exhaust holes are exhausted by the vacuum extractor to control the direction and speed of resin impregnation.
In one embodiment, the curing and forming process includes:
opening a heating system on the split forming mold or putting the split forming mold after glue injection into an oven, heating the oven from room temperature to 60-70 ℃ at a heating rate of 1-3 ℃/min, then preserving heat for 1.5-3 hours, then heating from room temperature to 85-95 ℃ at a heating rate of 1-2 ℃/min, preserving heat for 1.5-3 hours, then naturally cooling to room temperature, removing bags and demolding.
The invention provides a method for forming a cylinder wall of a large-size gas flow guide pipe, which is characterized in that on the basis of split molding, a Z-direction impregnation leading vacuum infusion forming technology is formed by arranging a plurality of flow channels which radially penetrate through a foam core material on a foam sandwich and designing the flow channels of a flow guide net component on a skin laying layer, the resin seepage distance is shortened, the difficult problem of liquid phase forming of a large-size and variable-section composite plate is solved by the flow channel design, the resin is rapidly spread in the surface and downward seeps and soaks a reinforcing material, the reinforcing material is dispersed through the flow guide groove holes of the core material, and a preformed body is soaked along the thickness direction, so that uniform impregnation is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a foam core in an embodiment of the present invention;
FIG. 2 is a schematic view of a layer structure of a cylindrical wall segment according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a vacuum infusion molding method for a cylindrical wall segment in an embodiment of the invention.
Reference numerals:
the foam sandwich structure comprises a foam sandwich 10, a diversion trench 101 and a reinforcing area 102;
a female die body 20 and an extraction hole 201;
a release cloth 301 and a vacuum bag film 302;
the device comprises a first flow guide net 401, a second flow guide net 402, a first glue injection pipe 403, a second glue injection pipe 404, a third glue injection pipe 405 and a blank 406.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The embodiment discloses a method for forming the wall of a large-size gas guide pipe cylinder, which is mainly applied to forming the inner wall or the outer wall of the gas guide pipe. The wall of the gas guide pipe is of a sandwich structure and comprises a foam sandwich core 10 in the middle, and an inner skin and an outer skin on the inner side and the outer side. Wherein, the inner skin and/or the outer skin are carbon-glass mixed skins, a plurality of guide grooves 101 which vertically penetrate through the foam core material are arranged on the foam core 10, and the foam core 10 is locally provided with a reinforced area 102, which is shown in fig. 1; the thickness of the inner skin of the reinforced region 102 is much greater than the thickness of the inner skin of other regions of the foam core 10, and the reinforced region 102 corresponds to the paddle region of the gas guiding tube, which has higher strength requirement than other regions. Specifically, the inner skin and the outer skin are both formed by laminating at least one glass fiber layer and at least one carbon fiber layer, and the number of the carbon fiber layers on the reinforcing area 102 is far greater than that of the glass fibers. More specifically, the foam core 10 is divided into a plurality of sections by taking the edge of the reinforced area 102 as a boundary, that is, the foam core 10 is composed of a plurality of foam unit pieces, adjacent foam unit pieces have intervals equal to the width of the diversion trench, and each reinforced area 103 corresponds to an independent foam unit piece, so that the resin glue solution at the edge of the reinforced area 103 can be rapidly impregnated in the Z direction, and the impregnation speed of the inner and outer skins of the reinforced area 102 is kept the same as that of other areas.
In this embodiment, the vacuum infusion molding method of the composite material plate specifically includes:
step 1, preparing a cylinder wall split body: and laying an outer skin reinforcing material, sandwich foam 10, an inner skin reinforcing material, a porous isolating membrane, demoulding cloth 301, a flow guide net component and a vacuum bag membrane 302 on a split forming mould layer by layer, then performing vacuum infusion, and then curing and forming. The split forming die comprises a female die body 20, a forming die cavity is arranged on the female die body 20, a plurality of air exhaust holes 201 are formed in the top of the female die body 20, the air exhaust holes 201 circumferentially surround the forming die cavity, and the air exhaust holes 201 vertically penetrate through the female die body 20;
and 2, splicing and fixing the split bodies of the cylinder walls to obtain the cylinder walls of the gas guide pipe, wherein split assembly is a conventional technical means in the field, and therefore the detailed description is omitted in the embodiment.
In this embodiment, the flow guiding net assembly includes a first flow guiding net 401, a second flow guiding net 402, a first glue injection pipe 403, a second glue injection pipe 404, a third glue injection pipe 405, and a gas guiding pipe. The head end of the first guide flow net 401 covers the head end of the inner skin, the tail end of the first guide flow net 401 is located at the head end of the reinforced area 102, the tail end of the second guide flow net 402 covers the tail end of the inner skin, the head end of the second guide flow net 402 covers the reinforced area 102, a margin 406 area is arranged between the head end of the second guide flow net 402 and the tail end of the first guide flow net 401, and the margin 406 corresponds to the disconnection position of the foam unit element. The first glue injection pipe 403 is arranged at the tail end of the first flow guide net 401, the second glue injection pipe 404 is arranged in the middle of the first flow guide net 401, the third glue injection pipe 405 is arranged in the middle of the second flow guide net 402, and the gas guide pipes are wound on the first flow guide net 401 and the second flow guide net 402. It should be noted that, in fig. 2, one end on the left side is a head end, and one end on the right side is a tail end, and fig. 2 is a schematic diagram of a ply, which is not an actual ply structure diagram.
Based on the structural design of the split forming mold and the flow guide net assembly, referring to fig. 3, the vacuum infusion forming method of the composite material plate in this embodiment specifically includes:
step 1.1, cleaning the surface of a female die body, sealing holes, polishing, coating a release agent, detecting the air tightness of a molded surface and a die, checking a heating system and a vacuum channel system, and monitoring the temperature and humidity;
step 1.2, laying an outer skin reinforcing material, sandwich foam 10, an inner skin reinforcing material, a porous isolating membrane and demolding cloth 301 in sequence in a forming cavity of a female die body 20, enabling the demolding cloth 301 to cover the forming cavity and each air suction hole 201, and sealing the air suction holes by using a semi-permeable membrane;
step 1.3, respectively laying a first flow guide net 401 and a second flow guide net 402 on an inner skin according to the structural design of a flow guide net assembly, and reserving a blank 406 area between the first flow guide net 401 and the second flow guide net 402, wherein the width of the reinforcing area 102 is a, and the width of the blank 406 area is 0.01 a-0.03 a;
step 1.4, laying a first glue injection pipe 403, a second glue injection pipe 404 and a third glue injection pipe 405, laying a gas guide pipe, and coating and fixing the gas guide pipe by using demolding cloth, wherein glue injection holes in the first glue injection pipe 403, the second glue injection pipe 404 and the third glue injection pipe 405 are all located in the middle positions;
step 1.5, sealing preset air exhaust holes on the female die body by using a semipermeable membrane to ensure smooth air passages of the air exhaust holes, and communicating the air guide pipes and the air exhaust holes by using a glue absorption felt or other air guide nets; laying a vacuum bag film 302 on the female die body 20, so that the vacuum bag film 302 covers the molding die cavity and each air extraction hole 201, and sealing the molding die cavity and the air extraction holes by using a sealing adhesive tape to form a sealed molding die cavity, so as to ensure that the molding die cavity is covered with the reinforcing material preform, the air extraction holes, the air guide pipes, the glue injection pipes and other auxiliary materials and auxiliary channels;
step 1.6, connecting each air exhaust hole 201 with a vacuumizing device, vacuumizing the sealed molding die cavity through the vacuumizing device and the air exhaust holes 201 to vacuum, checking air tightness, and carrying out the next step if the air tightness is qualified; otherwise, checking the sealing system, vacuumizing and checking the air tightness;
step 1.7, preparing a resin glue solution, defoaming, standing, and after the airtightness is qualified, injecting resin through a first glue injection pipe 403, beginning to inject resin through a second glue injection pipe 404 when the resin is soaked to the second glue injection pipe 404, beginning to inject resin through a third glue injection pipe 405 when the resin is soaked to the third glue injection pipe 405 until the resin glue solution completely soaks the reinforcing material, in the process, exhausting different air exhaust holes 201 through a vacuumizing device to control the soaking direction and speed of the resin, and enabling the resin to be rapidly spread in the plane and seep downwards to soak the reinforcing material through a first flow guide net 401 and a second flow guide net 402, disperse through holes 101 of a flow guide groove of a foam core material, and soak the preformed body in the thickness direction, so that uniform soaking is realized;
step 1.8, after the glue injection is completed, the first glue injection pipe 403, the second glue injection pipe 404 and the third glue injection pipe 405 are closed, and the vacuum pumping is continuously performed. And opening the split forming mold heating system or putting the split forming mold into an oven for curing and forming, and performing post-treatment such as demolding, trimming, detecting and the like after curing is finished to finally obtain the product. Wherein the curing process specifically comprises the following steps:
opening a split molding mold heating system or putting the split molding mold after glue injection into an oven, heating the oven from room temperature to 60-70 ℃ at a heating rate of 1-3 ℃/min, then preserving heat for 1.5-3 hours, then heating from room temperature to 85-95 ℃ at a heating rate of 1-2 ℃/min, then preserving heat for 1.5-3 hours, then naturally cooling to room temperature, and then removing bags and demolding.
As a preferred embodiment, a plurality of observation holes may be further disposed along the circumferential direction at the side of the female die body 20, so as to monitor the resin impregnation process in real time, and further ensure uniform impregnation.
In this embodiment, on the basis of completing the flow channel design through the flow guide net assembly on the skin laying layer and the flow guide groove 101 on the foam core material, it is ensured through process control that the pre-forming body is uniformly impregnated with the resin before gelation. The operating window of the vacuum infusion process depends on the viscosity characteristic of the resin matrix, the viscosity of the resin is controlled to be less than 1000mPa.s during the infusion process, and the infusion time must be less than the resin gel time. In this embodiment, through the multi-stage glue injection pipe design of the first glue injection pipe 403, the second glue injection pipe 404 and the third glue injection pipe 405, and by controlling the opening and closing schedules of the glue injection pipes at different stages, the resin flow and the impregnation speed are controlled, and the uniform and sufficient impregnation is ensured. And guiding the resin to permeate along the thickness direction through the distance of the flow guide net, controlling the flow direction of the resin, and realizing a Z-direction dominant impregnation mode by combining with a flow channel design.
It should be noted that in the resin infusion and curing molding process, the prevention of molding defects must be considered, and the emphasis is on both the infusion defect and the curing defect. The impregnation defects mainly comprise dry areas, cavities, gel shortage, white spots, semi-dry spots, dry threads, local rich gel, air bubbles and the like, and the curing defects mainly comprise non-curing, non-uniform curing, low curing degree and the like. In the embodiment, for the prevention of the impregnation defect, measures such as resin defoaming treatment, standing treatment, local drainage and the like are adopted besides runner design and process control; for the prevention of curing defects, firstly, a reasonable curing system needs to be formulated according to the curing characteristics of a resin system, and the curing temperature and time are controlled by a mold heating system to realize full and uniform curing.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A method for forming the cylinder wall of a large-size gas flow guide pipe is characterized in that the cylinder wall of the gas flow guide pipe is of a sandwich structure and comprises a foam sandwich in the middle, and inner skins and outer skins at the inner side and the outer side, a plurality of flow guide grooves penetrating through the foam sandwich in the radial direction are formed in the foam sandwich, the cylinder wall of the gas flow guide pipe is provided with a reinforcing area, and the thickness of the inner skins and the outer skins in the reinforcing area is far larger than that of the inner skins and the outer skins in other areas;
the forming method specifically comprises the following steps:
step 1, preparing a cylinder wall split body: after the surface treatment and detection of the split forming die are finished, laying an outer skin reinforcing material, sandwich foam, an inner skin reinforcing material, a porous isolating membrane, demoulding cloth and a flow guide net component on the split forming die layer by layer; then sealing by adopting a vacuum bag film and a sealing adhesive tape, connecting a vacuum system, vacuumizing and checking the air tightness; after the air tightness is qualified, preparing resin glue solution for vacuum infusion, and then curing and forming to obtain a cylinder wall split body;
and 2, splicing and fixing the cylinder wall split bodies to obtain the cylinder wall of the gas guide pipe.
2. The method for forming the cylinder wall of the large-size gas guide pipe according to claim 1, wherein in the step 1, the flow guide net assembly comprises a first flow guide net, a second flow guide net, a first glue injection pipe, a second glue injection pipe and a third glue injection pipe;
the head end of the first current guiding net covers the head end of the inner skin reinforcing material, and the tail end of the first current guiding net is positioned at the head end of the reinforcing area;
the tail end of the second flow guide net covers the tail end of the inner skin reinforcing material, the head end of the second flow guide net covers the reinforcing area, and a blank area is arranged between the head end of the second flow guide net and the tail end of the first flow guide net;
the first glue injection pipe is arranged at the tail end of the first flow guide net, the second glue injection pipe is arranged in the middle of the first flow guide net, and the third glue injection pipe is arranged in the middle of the second flow guide net.
3. The method as claimed in claim 2, wherein the width of the enhanced region is a, and the width of the margin is 0.01 a-0.03 a.
4. The method for forming the cylinder wall of the large-size gas guide pipe according to claim 2 or 3, wherein the split forming mold comprises a female mold body, a forming mold cavity is arranged on the female mold body, a plurality of air suction holes are arranged at the top of the female mold body, each air suction hole circumferentially surrounds the forming mold cavity, and the air suction holes vertically penetrate through the female mold body;
the vacuum infusion forming method comprises the following specific steps:
cleaning the surface of the female die body, sealing holes, polishing, coating a release agent, detecting the molded surface and the air tightness of the die, checking a heating system and a vacuum channel system, and monitoring the temperature and the humidity;
sequentially laying an outer skin reinforcing material, sandwich foam, an inner skin reinforcing material, a porous isolating membrane, demoulding cloth and a flow guide net component in a forming die cavity;
laying a vacuum bag film on the female die body, so that the vacuum bag film covers the molding die cavity and each air suction hole, and sealing the air suction holes by using a semi-permeable film;
connecting each air extraction hole with a vacuumizing device, vacuumizing the vacuum bag film of the sealed die cavity to be vacuum, and checking the air tightness;
injecting resin through the flow guide net assembly, and then curing and forming.
5. The method for forming the cylinder wall of the large-size gas guide pipe according to claim 4, wherein the resin is injected through the guide net assembly, and specifically comprises:
firstly, injecting resin through a first glue injection pipe;
when the resin is soaked to the second glue injection pipe, the resin is injected through the second glue injection pipe;
when the resin is soaked to the third glue injection pipe, the resin injection through the third glue injection pipe is started.
6. The method as claimed in claim 5, wherein the resin impregnation process is performed by evacuating different evacuation holes through a vacuum evacuation device to control the resin impregnation direction and speed.
7. The method for forming the cylinder wall of the large-size gas guide pipe according to claim 4, wherein the curing and forming process comprises:
opening a heating system on the split forming mold or putting the split forming mold after glue injection into an oven, heating the oven from room temperature to 60-70 ℃ at a heating rate of 1-3 ℃/min, then preserving heat for 1.5-3 hours, then heating from room temperature to 85-95 ℃ at a heating rate of 1-2 ℃/min, preserving heat for 1.5-3 hours, then naturally cooling to room temperature, removing bags and demolding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111338777.5A CN114103173B (en) | 2021-11-12 | Forming method of large-size gas flow guide pipe cylinder wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111338777.5A CN114103173B (en) | 2021-11-12 | Forming method of large-size gas flow guide pipe cylinder wall |
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| CN114103173A true CN114103173A (en) | 2022-03-01 |
| CN114103173B CN114103173B (en) | 2024-04-19 |
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| CN114851595A (en) * | 2022-04-25 | 2022-08-05 | 湖南弘辉科技有限公司 | Forming method of composite material plate and preparation method of catheter support arm |
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