CN109703062B - Method for manufacturing emission box end cover by adopting vacuum-assisted resin diffusion molding process - Google Patents
Method for manufacturing emission box end cover by adopting vacuum-assisted resin diffusion molding process Download PDFInfo
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- CN109703062B CN109703062B CN201910100226.1A CN201910100226A CN109703062B CN 109703062 B CN109703062 B CN 109703062B CN 201910100226 A CN201910100226 A CN 201910100226A CN 109703062 B CN109703062 B CN 109703062B
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Abstract
The invention relates to a method for manufacturing an end cover of a launching box by adopting a vacuum-assisted resin diffusion molding process, which comprises the following steps: layering with a reinforcing material; placing the reinforced material after being layered in a vacuum environment, and completely pumping air in the reinforced material; introducing resin by using vacuum, so that the reinforcing material is completely soaked by the resin, and stopping the introduction of the resin; curing the resin; and demolding, removing the flash, and performing surface functionalization treatment to obtain the end cover of the launching box. Compared with the prior art, the method for manufacturing the end cover of the launching box has the advantages that the operation is simple, the cost is low, the manufactured end cover of the launching box has the characteristic of light weight, and compared with end covers made of other materials with the same performance, the end cover of the launching box has the characteristics of light weight and thin thickness. According to the process, the structural functionalization of the end cover of the launching box is realized through a reasonable layering structure in the vacuum-assisted resin diffusion molding process method, and different cover opening modes can be realized only by changing the layering mode.
Description
Technical Field
The invention relates to a forming method, in particular to a method for manufacturing an end cover of a launching box by adopting a vacuum-assisted resin diffusion forming process.
Background
Rapid fire technology is a developing trend of missile weapon systems. At present, most of the missiles in China adopt a launching box (barrel) technology to replace the original naked missile launching, and the anti-interference performance and the launching hit rate are effectively improved. The end cover plays a role in sealing when being stored, so that the missile is effectively stored, and the service life of the missile is maintained. The end cover can give way when launching, does not influence the missile launch. The end caps play a very important role in the firing system.
The end cover is developed for years, the composite end cover is mainly used at present, and the composite end cover is light in weight and high in response speed. One of the more common composite end caps is a fiberglass end cap. In recent years, the requirement of the missile weapon system for light weight is more and more emphasized, the weight and the height size of the end cover are also limited, and the glass fiber reinforced plastics are emphasized because of high specific strength and can make a manufactured piece thinner. Meanwhile, the glass fiber reinforced plastic has stronger designability.
Glass fiber reinforced plastic is a material with a long research history, and the glass fiber reinforced plastic forming process is basically divided into two main types, namely wet contact forming and dry pressure forming. With the development of large-size missile launching boxes (barrels), the size of the end cover made of glass fiber reinforced plastics is increased. With the linear increase in product size, the cost and lead time of the die, forming equipment and associated tooling increases geometrically if a molding process is used. From cost and cycle considerations, a more economical molding method should be selected. Besides the mould pressing process, the glass fiber reinforced plastic forming process also comprises hand pasting, vacuum auxiliary forming and the like. The hand lay-up forming process has the advantages that: no complex equipment is needed, the investment is low, and the period is short; the structure, shape and size of the manufactured product are basically not limited; but the requirement on operators is high, the quality depends on the skill and experience of the operators, the quality consistency is poor, and meanwhile, the construction environment is severe and is not good for the health of the operators. The vacuum auxiliary forming process is to seal the product between the mold and the vacuum bag and pressurize the product by vacuumizing, so that the product has compact material and good mechanical property. The vacuum auxiliary forming method generally only needs one half of the mould, and the vacuum bag film can be used as the other half of the mould, so that the cost and the period are greatly saved for some parts with simple structures, even without special moulds.
A vacuum-assisted resin diffusion forming process (VARIM process for short) is one of vacuum-assisted forming processes, and is a high-performance and low-cost composite material forming process developed on the basis of an RTM (resin transfer molding) process. The impregnation of the fiber fabric in the sealed die cavity is realized by utilizing the flowing and the permeation of resin in a vacuum negative pressure environment, and meanwhile, the vacuum also plays a role in pressurizing a product. The vacuum-assisted forming method has the advantages of vacuum-assisted forming, and meanwhile, due to the vacuum infusion, resin is uniformly dispersed, and the influence of the construction environment on operators is reduced. The product structure can be easily changed by only changing the type and the layering mode of the fiber fabric and then performing pouring and curing by using VARIM.
However, there is no mature vacuum assisted resin diffusion molding process for forming the end caps of the launch boxes.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for manufacturing an end cover of a launch box by adopting a vacuum-assisted resin diffusion molding process.
The purpose of the invention can be realized by the following technical scheme:
a method for manufacturing an end cover of a launching box by adopting a vacuum-assisted resin diffusion molding process comprises the following steps:
layering with a reinforcing material;
placing the reinforced material after being layered in a vacuum environment, and completely pumping air in the reinforced material;
introducing resin by using vacuum, so that the reinforcing material is completely soaked by the resin, and stopping the introduction of the resin;
curing the resin;
and demolding, removing the flash, and performing surface functionalization treatment to obtain the end cover of the launching box.
Specifically, the method for manufacturing the end cover of the launching box by adopting a vacuum assisted resin diffusion forming process comprises the steps that used equipment comprises a vacuum pump, a pressure buffer tank, a product forming area and a resin system, wherein the vacuum pump is connected with the pressure buffer tank, the pressure buffer tank is connected with the product forming area, in addition, the resin system is also connected with the product forming area, when the method is used, a reinforcing material is used for layering in the product forming area, then the vacuum pump is started, so that the reinforcing material after layering in the product forming area is placed in a vacuum environment, and air in the reinforcing material is pumped completely; and then introducing the resin in the resin system into a product forming area by using vacuum, so that the resin completely soaks the reinforcing material, stopping introduction of the resin, finally curing the resin, demolding, removing the flash, and performing surface functionalization treatment to obtain the end cover of the launching box.
The product forming area comprises a vacuum film bag and a mold arranged in the vacuum film bag, the mold is used for placing a reinforcing material, after the reinforcing material is paved, demolding cloth is paved, a flow guide net is paved on the demolding cloth, the demolding cloth and the flow guide net are also positioned in the vacuum film bag, a vacuum tube is further arranged in the vacuum film bag and is used for being communicated with a pressure buffer tank, a resin tube is further arranged in the vacuum film bag and is used for being communicated with a resin system, a spiral tube is further arranged in the vacuum film bag and is arranged around the mold and connected with the resin tube, resin can be conveniently guided in from the center and can be uniformly diffused through the spiral tube, and the reinforcing material can be completely soaked.
For a burst-type end cover, the layering mode is as follows:
the reinforcing material is round-angle rectangular fabric, round-angle rectangles are used as circumferential grooves in the round-angle rectangular fabric, two diagonal lines in the round-angle rectangles are used as X grooves, the glass fiber surface felt is cut along the circumferential grooves and the X grooves, and 18 layers are counted and marked as A; cutting the glass fiber plain cloth along the circumferential groove and the X groove, wherein 1 layer is needed and marked as B; cutting the glass fiber mesh cloth along the circumferential groove and the X groove, wherein 2 layers are needed and marked as C; cutting the glass fiber surface felt along the circumferential groove, not cutting the X groove, and laying the reinforcing material on the die according to the sequence of B, C, A, D, wherein the total number of 6 layers is marked as D;
for a burst-type end cover, the layering mode is as follows:
the reinforcing material is round-angle rectangular fabric, round-angle rectangles are used as circumferential grooves in the round-angle rectangular fabric, two diagonal lines in the round-angle rectangles are used as X grooves, the glass fiber surface felt is cut along the circumferential grooves and the X grooves, and 18 layers are counted and marked as A; cutting the glass fiber plain cloth along the circumferential groove and the X groove, wherein 1 layer is needed and marked as B; cutting the glass fiber mesh cloth along the circumferential groove and the X groove, wherein 2 layers are needed and marked as C; the glass fiber face mat was cut along the X-grooves with no circumferential grooves cut for a total of 6 layers, noted D, and the reinforcement was laid on the mold in the order B, C, A, D.
The reinforcing material is selected from one or more of the following substances: glass fiber cloth, glass fiber felt, glass fiber fabric, glass fiber gridding cloth, aramid fiber cloth or carbon fiber cloth.
In the process of introducing the resin, the vacuum degree is maintained to be not lower than-0.06 MPa.
The resin includes epoxy resin, unsaturated polyester, and the like.
The curing agent is added into the resin, the curing agent and the resin are uniformly stirred, and the curing agent is prepared by adopting a conventional curing agent.
When the drainage network was completely wetted it was confirmed that the reinforcing material was also completely wetted. Whether the reinforcing material is completely soaked can be judged by visual inspection, and the method is simple and easy to operate.
The resin is cured at normal temperature, and the resin is cured at normal temperature. The curing conditions may also be selected according to the selected resin system.
The surface functionalization includes performing one or more of an electromagnetic shielding coating, a three-proofing (salt spray, mold, and damp heat) coating, a sealing coating, or an ablation-resistant coating.
The technological conditions of the electromagnetic shielding coating, the three-proofing coating, the sealing coating or the ablation-resistant coating can be completed by adopting conventional conditions, the construction process is determined by a selected coating system, and the construction is generally carried out by selecting a thermal spraying, air spraying or brushing coating process, and generally needs heating.
Compared with the prior art, the method for manufacturing the end cover of the launching box has the advantages that the operation is simple, the cost is low, the manufactured end cover of the launching box has the characteristic of light weight, and compared with end covers made of other materials with the same performance, the end cover of the launching box has the characteristics of light weight and thin thickness. Although the vacuum-assisted resin diffusion molding process method has been developed for a certain time, no public report is found yet for applying the vacuum-assisted resin diffusion molding process method to the manufacture of the end cover of the launching box.
According to the process, the structural functionalization of the end cover of the launching box is realized through a reasonable layering structure in the vacuum-assisted resin diffusion molding process method, and different cover opening modes can be realized only by changing the layering mode.
Drawings
FIG. 1 is a schematic connection diagram of the devices of the vacuum-assisted resin diffusion molding process.
FIG. 2 is a schematic connection diagram (cross section) of the consumables of the vacuum assisted resin diffusion molding process.
FIG. 3 is a schematic plane view of a fabric when the end cover is used for manufacturing the layer.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
A method for manufacturing a burst-type end cover of a launching box by adopting a vacuum-assisted resin diffusion molding process comprises the following steps:
layering with a reinforcing material;
placing the reinforced material after being layered in a vacuum environment, and completely pumping air in the reinforced material;
introducing resin by using vacuum, so that the reinforcing material is completely soaked by the resin, and stopping the introduction of the resin;
curing the resin;
and demolding, removing the flash, and performing surface functionalization treatment to obtain the end cover of the launching box.
Referring to fig. 1, a method for manufacturing an end cover of a launch box by using a vacuum assisted resin diffusion molding process is adopted, and used equipment comprises a vacuum pump 1, a pressure buffer tank 2, a product molding area 3 and a resin system 4, wherein the vacuum pump 1 is connected with the pressure buffer tank 2, the pressure buffer tank 2 is connected with the product molding area 3, in addition, the resin system 4 is also connected with the product molding area 3, when in use, a reinforcing material is used for layering in the product molding area, then the vacuum pump is started, so that the reinforcing material after layering in the product molding area is placed in a vacuum environment, and air in the reinforcing material is pumped out; and then introducing the resin in the resin system into a product forming area by using vacuum, so that the resin completely soaks the reinforcing material, stopping introduction of the resin, finally curing the resin, demolding, removing the flash, and performing surface functionalization treatment to obtain the end cover of the launching box.
Referring to fig. 2, the product forming area includes a vacuum film bag 5 and a mold 6 disposed in the vacuum film bag 5, the mold 6 is used for placing a reinforcing material 7, a releasing cloth 8 is laid after the reinforcing material 7 is laid, a flow guide net 9 is laid on the releasing cloth 8, the releasing cloth 8 and the flow guide net 9 are also disposed in the vacuum film bag 5, a vacuum tube 10 is further disposed in the vacuum film bag 5, the vacuum tube 10 is used for communicating with the pressure buffer tank 2, a resin tube 11 is further disposed in the vacuum film bag 5, the resin tube 11 is used for communicating with the resin system 4, a spiral tube 12 is further disposed in the vacuum film bag 5, the spiral tube 12 is disposed around the mold 6 and connected with the resin tube 11, so that the resin is uniformly diffused through the spiral tube after being introduced from the center, and completely soaks the reinforcing material. The periphery of the vacuum film bag 5 is provided with a sealing rubber strip 13.
According to the figure 3, the reinforcing material is round-angle rectangular fabric, round-angle rectangles are used as circumferential grooves in the round-angle rectangular fabric, two diagonal lines in the round-angle rectangles are used as X grooves, the glass fiber surface felt is cut along the circumferential grooves a and the X grooves b, and 18 layers are counted and marked as A; cutting the glass fiber plain cloth along the circumferential groove and the X groove, wherein 1 layer is needed and marked as B; cutting the glass fiber mesh cloth along the circumferential groove and the X groove, wherein 2 layers are needed and marked as C; the glass fiber surfacing mat was cut along the circumferential grooves (X grooves uncut) for a total of 6 layers, and is noted as D.
The reinforcement was laid on the mould in the order B, C, A, D, and then the consumables were installed according to fig. 2, with the equipment connected according to fig. 1.
Vacuumizing, maintaining the vacuum degree at-0.08 MPa, introducing ER3600 epoxy resin (which is solidified and uniformly stirred), stopping resin introduction after complete infiltration, curing at normal temperature, demolding, removing flash, and spraying a three-proofing coating. Through tests, the weight of the epoxy foam material end cover is 50% of that of an epoxy foam material end cover with the same function, and the epoxy foam material end cover has air tightness and three-proofing performance and is divided into four blocks along a preset groove during bursting.
Example 2
A method for manufacturing a burst-type end cover of a launching box by adopting a vacuum-assisted resin diffusion molding process comprises the following steps:
layering with a reinforcing material;
placing the reinforced material after being layered in a vacuum environment, and completely pumping air in the reinforced material;
introducing resin by using vacuum, so that the reinforcing material is completely soaked by the resin, and stopping the introduction of the resin;
curing the resin;
and demolding, removing the flash, and performing surface functionalization treatment to obtain the end cover of the launching box.
Referring to fig. 1, a method for manufacturing an end cover of a launch box by using a vacuum assisted resin diffusion molding process is adopted, and used equipment comprises a vacuum pump 1, a pressure buffer tank 2, a product molding area 3 and a resin system 4, wherein the vacuum pump 1 is connected with the pressure buffer tank 2, the pressure buffer tank 2 is connected with the product molding area 3, in addition, the resin system 4 is also connected with the product molding area 3, when in use, a reinforcing material is used for layering in the product molding area, then the vacuum pump is started, so that the reinforcing material after layering in the product molding area is placed in a vacuum environment, and air in the reinforcing material is pumped out; and then introducing the resin in the resin system into a product forming area by using vacuum, so that the resin completely soaks the reinforcing material, stopping introduction of the resin, finally curing the resin, demolding, removing the flash, and performing surface functionalization treatment to obtain the end cover of the launching box.
Referring to fig. 2, the product forming area includes a vacuum film bag 5 and a mold 6 disposed in the vacuum film bag 5, the mold 6 is used for placing a reinforcing material 7, a releasing cloth 8 is laid after the reinforcing material 7 is laid, a flow guide net 9 is laid on the releasing cloth 8, the releasing cloth 8 and the flow guide net 9 are also disposed in the vacuum film bag 5, a vacuum tube 10 is further disposed in the vacuum film bag 5, the vacuum tube 10 is used for communicating with the pressure buffer tank 2, a resin tube 11 is further disposed in the vacuum film bag 5, the resin tube 11 is used for communicating with the resin system 4, a spiral tube 12 is further disposed in the vacuum film bag 5, the spiral tube 12 is disposed around the mold 6 and connected with the resin tube 11, so that the resin is uniformly diffused through the spiral tube after being introduced from the center, and completely soaks the reinforcing material. The periphery of the vacuum film bag 5 is provided with a sealing rubber strip 13.
According to the figure 3, the reinforcing material is round-angle rectangular fabric, round-angle rectangles are used as circumferential grooves in the round-angle rectangular fabric, two diagonal lines in the round-angle rectangles are used as X grooves, the glass fiber surface felt is cut along the circumferential grooves a and the X grooves b, and 18 layers are counted and marked as A; cutting the glass fiber plain cloth along the circumferential groove and the X groove, wherein 1 layer is needed and marked as B; cutting the glass fiber mesh cloth along the circumferential groove and the X groove, wherein 2 layers are needed and marked as C; the glass fiber surfacing mat was cut along the X-grooves (circumferential grooves uncut) for a total of 6 layers, and is noted D.
The reinforcement was laid on the mould in the order B, C, A, D, and then the consumables were installed according to fig. 2, with the equipment connected according to fig. 1.
Vacuumizing, maintaining the vacuum degree at-0.06 MPa, introducing ER3600 epoxy resin (solidified and uniformly stirred), stopping resin introduction after complete infiltration, curing at normal temperature, demolding, removing flash, and spraying a three-proofing coating. Through tests, the weight of the epoxy foam material end cover is 60% of that of an epoxy foam material end cover with the same function, the epoxy foam material end cover has air tightness and three-proofing performance, and the epoxy foam material end cover is broken into four pieces along a preset groove during bursting.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications (including various different configurations and dimensions) can be made to the embodiments and the generic principles described herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (7)
1. A method for manufacturing an end cover of a launching box by adopting a vacuum-assisted resin diffusion molding process is characterized by comprising the following steps of:
layering with a reinforcing material;
placing the reinforced material after being layered in a vacuum environment, and completely pumping air in the reinforced material;
introducing resin by using vacuum, so that the resin completely soaks the reinforcing material, confirming that the reinforcing material is completely soaked when the flow guide net is completely soaked, and stopping the introduction of the resin;
curing the resin;
demolding, removing flash, and performing surface functionalization treatment to obtain an end cover of the launching box;
for a burst-type end cover, the layering mode is as follows:
the reinforcing material is round-angle rectangular fabric, round-angle rectangles are used as circumferential grooves in the round-angle rectangular fabric, two diagonal lines in the round-angle rectangles are used as X grooves, the glass fiber surface felt is cut along the circumferential grooves and the X grooves, and 18 layers are counted and marked as A; cutting the glass fiber plain cloth along the circumferential groove and the X groove, wherein 1 layer is needed and marked as B; cutting the glass fiber mesh cloth along the circumferential groove and the X groove, wherein 2 layers are needed and marked as C; cutting the glass fiber surface felt along the circumferential groove, not cutting the X groove, and laying the reinforcing material on the die according to the sequence of B, C, A, D, wherein the total number of 6 layers is marked as D;
for a burst-type end cover, the layering mode is as follows:
the reinforcing material is round-angle rectangular fabric, round-angle rectangles are used as circumferential grooves in the round-angle rectangular fabric, two diagonal lines in the round-angle rectangles are used as X grooves, the glass fiber surface felt is cut along the circumferential grooves and the X grooves, and 18 layers are counted and marked as A; cutting the glass fiber plain cloth along the circumferential groove and the X groove, wherein 1 layer is needed and marked as B; cutting the glass fiber mesh cloth along the circumferential groove and the X groove, wherein 2 layers are needed and marked as C; cutting the glass fiber surface felt along the X groove, not cutting the circumferential groove, and laying the reinforcing material on a mould according to the sequence of B, C, A, D, wherein the total number of 6 layers is marked as D;
it splits into four along predetermineeing annular slot and X groove when possessing airtight performance, three proofings performance, bursting to the launch canister end cover.
2. The method for manufacturing the end cover of the launching box by adopting the vacuum-assisted resin diffusion molding process as claimed in claim 1, wherein the used equipment comprises a vacuum pump, a pressure buffer tank, a product molding area and a resin system, wherein the vacuum pump is connected with the pressure buffer tank which is connected with the product molding area, in addition, the resin system is also connected with the product molding area, when in use, the reinforcing material is used for layering in the product molding area, then the vacuum pump is started, so that the reinforcing material which is layered in the product molding area is placed in a vacuum environment, and air in the reinforcing material is pumped out; and then introducing the resin in the resin system into a product forming area by using vacuum, so that the resin completely soaks the reinforcing material, stopping introduction of the resin, finally curing the resin, demolding, removing the flash, and performing surface functionalization treatment to obtain the end cover of the launching box.
3. The method of claim 2, wherein the end cap of the launch box is formed by a vacuum assisted resin diffusion molding process, it is characterized in that the product forming area comprises a vacuum film bag and a mould arranged in the vacuum film bag, the mould is used for placing reinforcing materials, after the reinforced material is layered, laying the stripping cloth, laying the flow guide net on the stripping cloth, wherein the stripping cloth and the upper flow guide net are also positioned in the vacuum film bag, the vacuum film bag is also internally provided with a vacuum tube which is used for being communicated with the pressure buffer tank, the vacuum film bag is also internally provided with a resin tube, the resin tube is communicated with the resin system, the vacuum film bag is also internally provided with a spiral tube which is arranged around the die, and the spiral pipe is connected with the resin pipe, so that the resin can be conveniently and uniformly diffused through the spiral pipe after being introduced from the center, and the reinforcing material is completely soaked.
4. The method of claim 1, wherein the vacuum is maintained at a level of at least-0.06 MPa during resin infusion.
5. The method of claim 1, wherein the resin comprises epoxy resin, unsaturated polyester resin.
6. The method for manufacturing the end cover of the launch box by using the vacuum-assisted resin diffusion molding process according to claim 1, wherein a curing agent is added into the resin, and the curing agent and the resin are uniformly stirred.
7. The method of claim 1, wherein the surface functionalization comprises one or more of an electromagnetic shielding coating, a three-proofing coating, a sealing coating, or an ablation-resistant coating.
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| CN2926979Y (en) * | 2006-04-30 | 2007-07-25 | 南京航空航天大学 | Easily-broken composite-film cap |
| CN102328441A (en) * | 2011-09-30 | 2012-01-25 | 天津德风科技有限公司 | Process for producing glass reinforced plastic through strong core mat vacuum infusion |
| CN102514207A (en) * | 2011-12-14 | 2012-06-27 | 奇瑞汽车股份有限公司 | Production method of composite material automobile parts |
| CN104325657A (en) * | 2014-08-27 | 2015-02-04 | 新疆金风科技股份有限公司 | Vacuum assistant resin casted protection coating, system and method of permanent magnet motor rotor |
| CN104626601A (en) * | 2015-01-30 | 2015-05-20 | 中国船舶重工集团公司第七二五研究所 | Carbon fiber hybrid resin matrix composite material and preparation method thereof |
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