CN112008991B - Process for solving problem of dry cloth in vacuum infusion molding of composite material - Google Patents
Process for solving problem of dry cloth in vacuum infusion molding of composite material Download PDFInfo
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- CN112008991B CN112008991B CN202010809270.2A CN202010809270A CN112008991B CN 112008991 B CN112008991 B CN 112008991B CN 202010809270 A CN202010809270 A CN 202010809270A CN 112008991 B CN112008991 B CN 112008991B
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- air
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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
Abstract
A process for solving the problem of dry cloth in vacuum infusion molding of composite materials relates to the technical field of vacuum infusion molding, and a plurality of through holes are formed in a mold bottom plate; reserving a deceleration area which is not covered by the flow guiding net at the edge end of the fiber reinforced material; a circle of flow guide pipes are respectively distributed at the bottom and the top of the mould, and each flow guide pipe is provided with two opposite pumping ports; covering a preset number of layers of axial cloth at the air exhaust port; pumping and filling according to the following steps: step 1, blocking two air extraction openings on a flow guide pipe at the top of the mold, and extracting air from the two air extraction openings on the flow guide pipe at the bottom of the mold; step 2, after the lower part of the fiber reinforced material is soaked, conducting two air pumping ports on a honeycomb duct at the top of the mold and pumping air from the two air pumping ports on the honeycomb duct at the top of the mold; the process for solving the problem of dry cloth in vacuum infusion molding of the composite material can avoid the phenomena of dry cloth and incomplete injection of all fiber materials when the number of layers of the fiber materials of a vacuum infusion molded product is large and thick.
Description
The technical field is as follows:
the invention relates to the technical field of vacuum infusion molding, in particular to a process for solving the problem of dry cloth in vacuum infusion molding of a composite material.
Background art:
the vacuum infusion process is characterized in that resin is infused by vacuum force, resin sizing materials are infused by distributed guide pipes by utilizing the principle of air vacuum negative pressure, and a product structure layer is compacted by utilizing atmospheric pressure. The vacuum infusion forming process is to lay fiber reinforced material directly on the mold according to the structural design requirement, lay a layer of demolding cloth on the fiber reinforced material, the demolding cloth is usually a very thin fiber fabric with low porosity and low permeability, lay a flow guiding net on the demolding cloth, then cover with its vacuum bag, and seal. The mould is coated and sealed by a vacuum bag film, the vacuum pump pumps air to a negative pressure state, the demoulding cloth is easy-to-strip low-porosity fiber fabric, the flow guide net is a high-permeability medium, and the flow guide pipes are distributed on the flow guide cloth. The resin enters the whole system through the rubber inlet pipe, the main flowing direction of the resin is guided through the guide pipe, the resin is distributed to each corner of the paving layer through the guide cloth, and the demolding cloth is stripped after curing, so that the structural paving layer with high compactness and low rubber content is obtained. Compared with the traditional process, the vacuum infusion process has the advantages that the strength and rigidity of the product are greatly improved, the utilization rate of resin is greatly improved, the using amount of the resin can be accurately controlled, the bubbles of the product are less, and the porosity is low. However, the vacuum infusion process has many disadvantages, such as air leakage during the infusion process, resin blockage and no flow, resin accumulation and swelling, etc., which can be minimized or avoided in the process details and in the actual operation of the personnel. However, some products are all paved on a mould by using composite materials to ensure the strength of the products, the number of layers is large and thick, the defects of dry cloth and the like can occur inside the products during glue injection, all fiber materials cannot be injected, the mechanical property of the products is affected, and the products cannot be used.
The invention content is as follows:
in order to solve the technical problem, the invention provides a process for solving the problem of dry cloth in vacuum infusion molding of a composite material, which can avoid the phenomena of dry cloth and incomplete injection of all fiber materials when the number of layers of the fiber materials of a vacuum infusion molded product is large and thick.
The invention is realized by the following technical scheme:
a process for solving the problem of dry cloth in vacuum infusion molding of composite materials is characterized in that a preset number of through holes are formed in a mold bottom plate; reserving a deceleration area which is not covered by the flow guiding net at the edge end of the fiber reinforced material when the flow guiding net is laid; a circle of flow guide pipes are respectively distributed at the bottom and the top of the mould, and each flow guide pipe is provided with two opposite pumping ports; covering a preset number of layers of axial cloth at the air exhaust port; performing air suction and perfusion according to the following steps:
step 1, blocking two air suction ports on a flow guide pipe at the top of the mold, and sucking air from the two air suction ports on the flow guide pipe at the bottom of the mold;
and 2, after the lower part of the fiber reinforced material is soaked, conducting the two air pumping ports on the top flow guide pipe of the mold and pumping air from the two air pumping ports on the top flow guide pipe of the mold.
In another aspect of the invention, the mold is wrapped with an air-permeable felt, the draft tube is positioned inside the air-permeable felt, and the air-permeable felt is wrapped with a vacuum bag.
In another aspect of the invention, the through hole has an inner diameter of 3mm.
In another aspect of the present invention, the number of the through holes is 4.
In another aspect of the invention, the connecting line between the two air pumping ports on the top flow guide pipe of the mold is perpendicular to the connecting line between the two air pumping ports on the bottom flow guide pipe of the mold.
In another aspect of the invention, the axial cloth is a fiberglass cloth.
The invention has the beneficial effects that: the process for solving the problem of dry cloth in vacuum infusion molding of the composite material can avoid the phenomena of dry cloth and incomplete injection of all fiber materials when the number of layers of the fiber materials of a vacuum infusion molded product is large and thick.
Description of the drawings:
FIG. 1 is a schematic side view of an embodiment of the present invention.
In the drawings: 1. glass fiber cloth, 2, an air exhaust opening, 3, a flow guide pipe, 4, a fiber reinforced material, 5, a flow guide net, 6, demolding cloth, 7, a vacuum pump, 8, an injection inlet, 9, a through hole, 10, a mold, 11 and resin.
The specific implementation mode is as follows:
the following describes the embodiments of the present invention with reference to the drawings and examples:
in the description of the present invention, it is to be understood that the description indicating the orientation or positional relationship is based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
A process for solving the problem of dry cloth in vacuum infusion molding of a composite material comprises the steps of forming a preset number of through holes 9 on a bottom plate of a mold 10, wherein in the embodiment, the number of the through holes 9 is 4, the inner diameter of each through hole 9 is 3mm, and the 4 through holes 9 are uniformly distributed on the bottom plate of the mold 10; when the diversion net 5 is laid, a deceleration area which is not covered by the diversion net 5 is reserved at the edge end of the fiber reinforced material 4, and in the embodiment, the laying length of the diversion net 5 accounts for 2/3 of the product; as shown in the attached drawings, a circle of flow guide pipes 3 are respectively distributed at the bottom and the top of a mould 10, and each flow guide pipe 3 is provided with two opposite pumping holes 2; covering a preset number of layers of axial cloth at the air suction port 2, wherein the axial cloth is glass fiber cloth 1 in the embodiment; the glue injection inlet 8 is located in the middle of the fiber reinforced material 4. The air suction and filling are carried out according to the following steps:
step 1, blocking two air pumping ports 2 on a flow guide pipe at the top of the mould (when the mould is blocked, the flow guide pipe can be bent and blocked in a binding belt binding mode), and pumping air from the two air pumping ports 2 on the flow guide pipe at the bottom of the mould;
and 2, after the lower part of the fiber reinforced material 4 is soaked by the resin, conducting the two air pumping ports 2 on the top flow guide pipe of the mould and pumping air from the two air pumping ports 2 on the top flow guide pipe of the mould.
The mold 10 is wrapped with a ventilated felt, the draft tube 3 is located on the inner side of the ventilated felt, and the ventilated felt is wrapped with a vacuum bag.
The connecting line between the two air pumping holes 2 on the honeycomb duct at the top of the mould is vertical to the connecting line between the two air pumping holes 2 on the honeycomb duct at the bottom of the mould.
The invention improves from the aspect of the outer part of the product, and further solves the problems that when the product has a plurality of layers and is thick, the dry cloth appears in the product and the whole fiber reinforced material 4 is not injected. Drilling 4 phi 3 mm's aperture on mould 10 bottom plate can let the resin permeate the surface of fibre reinforced material 4 from fibre reinforced material 4's internal surface, annotate the bottom fibre thoroughly, the length is laid for 2/3 of goods to water conservancy diversion net 5, the speed reduction region has been left, prevent that the injecting glue speed is too fast, avoid forming local dry cloth of product and inside cavity, it adopts multilayer glass fiber cloth 1 as the choked flow region to bleed, glass fiber cloth 1 inhales the volume of gluing and compares in other fiber material higher, can prevent that extraction opening 2 from getting into the resin too early, mould 10 bottom and top are twined round honeycomb duct 3 respectively and can make atmospheric pressure balanced when the evacuation, guarantee that the resin is balanced to flow.
The process for solving the problem of dry cloth in vacuum infusion molding of the composite material is applied to the vacuum infusion process, and the phenomena of dry cloth and incomplete injection of all fiber materials can be avoided when the number of layers of the fiber materials of a vacuum infusion molded product is large and thick.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.
Claims (1)
1. A process for solving the problem of dry cloth in vacuum infusion molding of composite materials is characterized in that a bottom plate of a mold (10) is provided with a preset number of through holes (9); when the flow guide net (5) is laid, a deceleration area which is not covered by the flow guide net (5) is reserved at the edge end of the fiber reinforced material (4); a circle of flow guide pipes (3) are respectively distributed at the bottom and the top of the mould, and each flow guide pipe (3) is provided with two opposite pumping holes (2); covering a preset number of layers of axial cloth at the air extraction opening (2); performing air suction and perfusion according to the following steps:
step 1, blocking two air pumping ports (2) on a flow guide pipe at the top of the mold, and pumping air from the two air pumping ports (2) on the flow guide pipe at the bottom of the mold;
step 2, after the lower part of the fiber reinforced material (4) is soaked, conducting two air pumping ports (2) on a honeycomb duct at the top of the mold and pumping air from the two air pumping ports (2) on the honeycomb duct at the top of the mold;
the mold is wrapped with a ventilated felt, the flow guide pipe is positioned on the inner side of the ventilated felt, and the ventilated felt is wrapped with a vacuum bag;
the inner diameter of the through hole (9) is 3mm;
the number of the through holes (9) is 4;
the connecting line between the two air pumping ports (2) on the honeycomb duct at the top of the mould is vertical to the connecting line between the two air pumping ports (2) on the honeycomb duct at the bottom of the mould;
the axial cloth is glass fiber cloth (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010809270.2A CN112008991B (en) | 2020-08-12 | 2020-08-12 | Process for solving problem of dry cloth in vacuum infusion molding of composite material |
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| CN202010809270.2A CN112008991B (en) | 2020-08-12 | 2020-08-12 | Process for solving problem of dry cloth in vacuum infusion molding of composite material |
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| CN112008991B true CN112008991B (en) | 2023-01-20 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4942013A (en) * | 1989-03-27 | 1990-07-17 | Mcdonnell Douglas Corporation | Vacuum resin impregnation process |
| WO2011015999A1 (en) * | 2009-08-05 | 2011-02-10 | Mwangi, Festus Maina | Composite components |
| CN102756481A (en) * | 2012-07-27 | 2012-10-31 | 国电联合动力技术(连云港)有限公司 | Manufacturing method of carbon fiber girder for fan blade |
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| CN208946720U (en) * | 2018-07-30 | 2019-06-07 | 中材科技(萍乡)风电叶片有限公司 | A kind of outer reinforcement priming by vacuum structure of wind electricity blade front and rear edge |
Family Cites Families (7)
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|---|---|---|---|---|
| EP1038656A1 (en) * | 1999-03-02 | 2000-09-27 | LS Technologies, Inc. A Pennsylvania Corporation | Vacuum resin impregnation process |
| CN102529046B (en) * | 2011-12-26 | 2015-08-05 | 兴源环境科技股份有限公司 | Macromolecule plastic membrane pressure process injection molding system and the method for forming |
| CA2859114A1 (en) * | 2013-08-29 | 2015-02-28 | International Automotive Components Group North America, Inc. | Formed articles comprising carbon and natural fibers, methods of manufacture and use thereof |
| CN104647780A (en) * | 2015-02-11 | 2015-05-27 | 张玉清 | Combined type mold |
| CN106142593B (en) * | 2015-04-10 | 2019-11-26 | 科思创德国股份有限公司 | The method for manufacturing article of fiber reinforced plastics |
| CN110994921A (en) * | 2019-11-27 | 2020-04-10 | 宜格赛特自动化技术(苏州)有限公司 | Method for forming potted rotor disc |
| CN111070730B (en) * | 2020-01-03 | 2021-05-28 | 国电联合动力技术有限公司 | Vacuum perfusion method for wind power blade |
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2020
- 2020-08-12 CN CN202010809270.2A patent/CN112008991B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4942013A (en) * | 1989-03-27 | 1990-07-17 | Mcdonnell Douglas Corporation | Vacuum resin impregnation process |
| WO2011015999A1 (en) * | 2009-08-05 | 2011-02-10 | Mwangi, Festus Maina | Composite components |
| CN102756481A (en) * | 2012-07-27 | 2012-10-31 | 国电联合动力技术(连云港)有限公司 | Manufacturing method of carbon fiber girder for fan blade |
| CN105904747A (en) * | 2016-04-13 | 2016-08-31 | 山东英特力新材料有限公司 | Repairing method of large composite material shelter |
| CN107187080A (en) * | 2017-05-25 | 2017-09-22 | 中材科技(萍乡)风电叶片有限公司 | One kind is used for composite thick member vacuum infusion molding process for compound method |
| CN208946720U (en) * | 2018-07-30 | 2019-06-07 | 中材科技(萍乡)风电叶片有限公司 | A kind of outer reinforcement priming by vacuum structure of wind electricity blade front and rear edge |
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