CN112644040A - Low-cost liquid forming test plate manufacturing process - Google Patents
Low-cost liquid forming test plate manufacturing process Download PDFInfo
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- CN112644040A CN112644040A CN202011594622.3A CN202011594622A CN112644040A CN 112644040 A CN112644040 A CN 112644040A CN 202011594622 A CN202011594622 A CN 202011594622A CN 112644040 A CN112644040 A CN 112644040A
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- fabric
- manufacturing process
- liquid forming
- cost liquid
- test panel
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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
-
- 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 is suitable for the technical field of composite material processing, and provides a low-cost liquid forming test board manufacturing process which comprises the steps of sequentially carrying out fabric inspection, fabric shaping, cutting, preform preparation, shaping, curing and demolding, wherein the content of a shaping agent is 6g/m during fabric shaping2So that the shear strength and glass transition temperature performance of the test plate reach high levels. In addition, in the forming step, diaphragms are arranged on the upper side and the lower side of the fabric to form a laminated piece, the laminated piece is pressed to a mould through methods of heating, vacuumizing and the like under the auxiliary action of a special diaphragm, and the fiber slippage is accurately controlled to achieve the purposes of no wrinkle and no wave, so that the surface quality and the mechanical property of the prefabricated piece are accurately controlled, and the prefabricated piece meets the requirements of a liquid forming process.
Description
Technical Field
The invention belongs to the technical field of composite material processing, and particularly relates to a low-cost liquid forming test board manufacturing process.
Background
At present, the large-scale main bearing structure of a domestic main engine plant basically adopts the traditional autoclave forming process, and the manufactured product has the advantages of smooth surface, uniform internal mass distribution and low porosity, but has the defects of long production period, high equipment cost and high energy consumption, thereby causing high cost.
Disclosure of Invention
The invention provides a low-cost liquid forming test plate manufacturing process, and aims to solve the problems in the prior art.
The invention is realized in this way, a low-cost liquid forming test board manufacturing process, including the following steps:
s1, checking: inspecting the fabric to obtain a fabric raw material which meets a preset qualified standard;
s2, shaping and cutting the fabric: setting agent is added according to the proportion of 6g/m2The quality of the fabric is spread on the fabric and is subjected to heat setting, the fabric is cut into a required shape by a cutting machine after the fabric is set, the fabric cut into a specified shape is numbered and is sealed and stored, and a prefabricated body raw material is obtained;
s3, preparation of a preform: placing the mould in heating equipment, heating to 60 ℃, taking out, and paving the prepreg and the fabric on the surface of the mould according to the label;
s4, molding: arranging diaphragms on the upper side and the lower side of the fabric to form a laminated piece, and pressing the laminated piece to a mold by heating, vacuumizing and other methods under the auxiliary action of the specially-made diaphragms;
s5, curing: conveying the mold into heating equipment, closing a glue injection pipeline, connecting a glue outlet pipeline and an air exhaust pipeline, starting the heating equipment, starting glue injection when the temperature reaches a glue injection temperature, heating the heating equipment according to a resin curing system after the glue injection is finished, and cooling a workpiece along with a furnace after the curing is finished;
s6, demolding: and when the temperature of the die is reduced to below 60 ℃, demolding is started, the rough finished product is cut, the cutting area is polished, the surface of the product is cleaned by using a cleaning agent, and the paint spraying protection is carried out, so that a test board product is obtained.
Preferably, the method further comprises step S7: and carrying out nondestructive testing on the test plate product to obtain the test plate product which reaches the preset qualified quality.
Preferably, the method further comprises step S8: the test panel product obtained in step S7 is machined to improve the surface finish of the test panel.
Preferably, the fabric is a carbon fiber fabric.
Preferably, in step S4, a double-diaphragm forming device is used to perform the forming operation;
the double diaphragm forming device comprises: a lower die and an upper die; the top of the lower die is provided with a lower die groove; the laminating piece is arranged on the top of the lower die, and the upper die is arranged on the top of the laminating piece;
the bottom of the upper die is provided with an upper die groove, and the upper die is provided with a pressure hole communicated with the upper die groove;
and a vacuum hole for vacuumizing is formed in the lower die and communicated with the lower die groove.
Preferably, in step S3, 1 to 2 layers of prepreg are applied to the mold, and the remaining number of layers of fabric are applied.
Preferably, in the step S3, the prepreg is vacuum-compacted once per one laid layer, and the fabric is heat-set once per 3-8 laid layers.
Preferably, in the step S5, the glue injection method is multi-point glue injection.
Compared with the prior art, the invention has the beneficial effects that: the low-cost liquid forming test board manufacturing process comprises the steps of sequentially carrying out fabric inspection, fabric shaping, cutting, preform preparation, shaping, curing and demolding, wherein the content of a shaping agent is 6g/m during fabric shaping2So that the shear strength and glass transition temperature performance of the test plate reach high levels. In addition, in the molding step, double-diaphragm molding is adopted, and the fiber slippage is accurately controlled so as to achieve no wrinkling and no wave, so that the surface quality and the mechanical property of the prefabricated body are accurately controlled, and the prefabricated body meets the requirements of a liquid molding process.
Drawings
FIG. 1 is a flow chart of a low-cost liquid molding test panel manufacturing process according to the present invention.
Fig. 2 is a schematic structural diagram of a double-diaphragm forming device adopted by the invention.
In the figure: 1-upper die and 2-lower die.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1, the present embodiment provides a technical solution: a low-cost liquid molding test panel manufacturing process comprises the following steps:
s1, checking: inspecting the fabric to obtain a fabric raw material which meets a preset qualified standard; the fabric is a carbon fiber fabric.
S2, shaping and cutting the fabric: setting agent is added according to the proportion of 6g/m2The quality of the fabric is spread on the fabric and is subjected to heat setting, the fabric is cut into a required shape by a cutting machine after the fabric is set, the fabric cut into a specified shape is numbered and is sealed and stored, and a prefabricated body raw material is obtained;
s3, preparation of a preform: and (3) placing the mould in a heating device, heating to 60 ℃, taking out, paving the prepreg and the fabric on the surface of the mould according to the mark number, paving 1-2 layers of prepreg on the mould, and paving the fabric on the rest layers. And (3) performing vacuum compaction once when each layer of prepreg is laid, and performing heat setting once when each layer of fabric is laid and adhered with 3-8 layers.
S4, molding: the upper and lower sides of the fabric are provided with membranes to form a laminated piece, and the laminated piece is pressed to a mould by heating, vacuumizing and other methods under the auxiliary action of a special membrane.
As shown in fig. 2, the molding operation is performed using a double diaphragm molding apparatus.
The double diaphragm forming device comprises: a lower die 1 and an upper die 2; the top of the lower die 1 is provided with a lower die groove; the lamination member is disposed on top of the lower mold, and the upper mold 1 is disposed on top of the lamination member.
The bottom of the upper die 2 is provided with an upper die groove, and the upper die 2 is provided with a pressure hole communicated with the upper die groove.
The lower die 1 is internally provided with a vacuum hole for vacuumizing, and the vacuum hole is communicated with the lower die groove.
S5, curing: and (3) conveying the die into a heating device, closing the glue injection pipeline, connecting the glue outlet pipeline with the air exhaust pipeline, starting the heating device, starting glue injection when the temperature reaches the glue injection temperature, heating the heating device according to a resin curing system after the glue injection is finished, and cooling the workpiece along with the furnace after the curing is finished. In this embodiment, the glue injection method is multi-point glue injection.
S6, demolding: and when the temperature of the die is reduced to below 60 ℃, demolding is started, the rough finished product is cut, the cutting area is polished, the surface of the product is cleaned by using a cleaning agent, and the paint spraying protection is carried out, so that a test board product is obtained.
And S7, carrying out nondestructive testing on the test board product to obtain the test board product which reaches the preset qualified quality.
S8, machining the test board product obtained in the step S7 to improve the surface smoothness of the test board.
The use of the sizing agent material is beneficial to improving the stability of the fiber fabric and the consolidation of parts to form an integral structural member. The content of the setting agent is an important parameter for setting treatment, too much setting agent can cause poor shape following performance, too little setting agent can not achieve the setting effect, and the process operation is difficult. Through years of experimental study and process verification, the leader team accumulates the content of the sizing agent and the sizing process parameters matched with different fabrics (or fibers), and the short beam shearing and DMA-Tg of a certain 285S satin fabric composite material laminated plate under different sizing agent contents are given in table 1.
It can be seen from the table that 6g/m2The setting agent content effect is better.
The thermal diaphragm forming process is to laminate the composite material prepreg or shaped fabric and place the laminated material or shaped fabric on a mold, and to press the laminated part to the mold by heating, vacuumizing and other methods under the assistance of a special diaphragm to form the required shape, which can be used for forming parts with complicated shapes. A typical application is a400M military transport aircraft wing main spar. The hot diaphragm forming can be divided into single diaphragm preforming and double diaphragm preforming from the technical method, the pressing piece is positioned inaccurately and slides easily in the single diaphragm preforming process, but the technical process is simple, the cost of raw materials is low, the preforming time is short, and the forming quality of a part with a complicated shape and a thick thickness can be effectively ensured by double diaphragm forming. The double-diaphragm forming technology of the invention can accurately control the surface quality and the mechanical property of the prefabricated part by accurately controlling the fiber slippage to achieve no wrinkling and no wave, so that the prefabricated part meets the requirements of the liquid forming process.
In addition, in a specific implementation environment, in order to complete the manufacturing process, after step S8, steps of assembly and factory inspection may be further included.
In conclusion, the low-cost liquid forming test board manufacturing process provided by the invention sequentially carries out fabric inspection, fabric shaping, cutting, preform preparation, forming, curing and demolding, and the content of the shaping agent is 6g/m during fabric shaping2So that the shear strength and glass transition temperature performance of the test plate reach high levels. In addition, in the forming step, diaphragms are arranged on the upper side and the lower side of the fabric to form a laminated piece, the laminated piece is pressed to a mould through methods of heating, vacuumizing and the like under the auxiliary action of a special diaphragm, and the fiber slippage is accurately controlled to achieve the purposes of no wrinkle and no wave, so that the surface quality and the mechanical property of the prefabricated piece are accurately controlled, and the prefabricated piece meets the requirements of a liquid forming process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A low-cost liquid forming test board manufacturing process is characterized in that: the method comprises the following steps:
s1, checking: inspecting the fabric to obtain a fabric raw material which meets a preset qualified standard;
s2, shaping and cutting the fabric: setting agent is added according to the proportion of 6g/m2The quality of the fabric is spread on the fabric and is subjected to heat setting, the fabric is cut into a required shape by a cutting machine after the fabric is set, the fabric cut into a specified shape is numbered and is sealed and stored, and a prefabricated body raw material is obtained;
s3, preparation of a preform: placing the mould in heating equipment, heating to 60 ℃, taking out, and paving the prepreg and the fabric on the surface of the mould according to the label;
s4, molding: arranging diaphragms on the upper side and the lower side of the fabric to form a laminated piece, and pressing the laminated piece to a mold by heating, vacuumizing and other methods under the auxiliary action of the specially-made diaphragms;
s5, curing: conveying the mold into heating equipment, closing a glue injection pipeline, connecting a glue outlet pipeline and an air exhaust pipeline, starting the heating equipment, starting glue injection when the temperature reaches a glue injection temperature, heating the heating equipment according to a resin curing system after the glue injection is finished, and cooling a workpiece along with a furnace after the curing is finished;
s6, demolding: and when the temperature of the die is reduced to below 60 ℃, demolding is started, the rough finished product is cut, the cutting area is polished, the surface of the product is cleaned by using a cleaning agent, and the paint spraying protection is carried out, so that a test board product is obtained.
2. A low cost liquid forming test panel manufacturing process as claimed in claim 1, wherein: further comprising step S7: and carrying out nondestructive testing on the test plate product to obtain the test plate product which reaches the preset qualified quality.
3. A low cost liquid forming test panel manufacturing process as claimed in claim 2, wherein: further comprising step S8: the test panel product obtained in step S7 is machined to improve the surface finish of the test panel.
4. A low cost liquid forming test panel manufacturing process as claimed in claim 1, wherein: the fabric is a carbon fiber fabric.
5. A low cost liquid forming test panel manufacturing process as claimed in claim 1, wherein: in step S4, a double diaphragm forming apparatus is used to perform a forming operation;
the double diaphragm forming device comprises: a lower die and an upper die; the top of the lower die is provided with a lower die groove; the laminating piece is arranged on the top of the lower die, and the upper die is arranged on the top of the laminating piece;
the bottom of the upper die is provided with an upper die groove, and the upper die is provided with a pressure hole communicated with the upper die groove;
and a vacuum hole for vacuumizing is formed in the lower die and communicated with the lower die groove.
6. A low cost liquid forming test panel manufacturing process as claimed in claim 1, wherein: in the step S3, 1 to 2 layers of prepreg are laid on the mold, and the remaining number of layers is laid on the fabric.
7. A low cost liquid forming test panel manufacturing process as claimed in claim 1, wherein: in the step S3, the prepreg is compacted once when being laid one layer, and the fabric is heat-set once when being laid 3-8 layers.
8. A low cost liquid forming test panel manufacturing process as claimed in claim 1, wherein: in the step S5, the glue injection method is multi-point glue injection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011594622.3A CN112644040A (en) | 2020-12-29 | 2020-12-29 | Low-cost liquid forming test plate manufacturing process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011594622.3A CN112644040A (en) | 2020-12-29 | 2020-12-29 | Low-cost liquid forming test plate manufacturing process |
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| CN112644040A true CN112644040A (en) | 2021-04-13 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104742382A (en) * | 2015-04-10 | 2015-07-01 | 东华大学 | Pressure-assisted VARI (vacuum assisted resin infusion) forming device and method |
| CN106142587A (en) * | 2016-07-27 | 2016-11-23 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | The double bag hot barrier film preformation method of a kind of composite |
| CN107471683A (en) * | 2017-07-27 | 2017-12-15 | 江苏恒神股份有限公司 | A kind of composite liquid is molded finished pieces with complex shapes method |
| CN107866988A (en) * | 2017-10-20 | 2018-04-03 | 江苏恒神股份有限公司 | The preparation method of prepreg vacuum aided liquid molding product |
| CN111491772A (en) * | 2017-10-23 | 2020-08-04 | 迈凯轮汽车有限公司 | Molding apparatus |
-
2020
- 2020-12-29 CN CN202011594622.3A patent/CN112644040A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104742382A (en) * | 2015-04-10 | 2015-07-01 | 东华大学 | Pressure-assisted VARI (vacuum assisted resin infusion) forming device and method |
| CN106142587A (en) * | 2016-07-27 | 2016-11-23 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | The double bag hot barrier film preformation method of a kind of composite |
| CN107471683A (en) * | 2017-07-27 | 2017-12-15 | 江苏恒神股份有限公司 | A kind of composite liquid is molded finished pieces with complex shapes method |
| CN107866988A (en) * | 2017-10-20 | 2018-04-03 | 江苏恒神股份有限公司 | The preparation method of prepreg vacuum aided liquid molding product |
| CN111491772A (en) * | 2017-10-23 | 2020-08-04 | 迈凯轮汽车有限公司 | Molding apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 顾诵芬 总主编: "《结构复合材料》", 30 June 2019, 上海交通大学出版社, pages: 203 - 204 * |
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Application publication date: 20210413 |
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