CN113681939A - Equivalent substitution method for composite material thermocouple - Google Patents
Equivalent substitution method for composite material thermocouple Download PDFInfo
- Publication number
- CN113681939A CN113681939A CN202110873785.3A CN202110873785A CN113681939A CN 113681939 A CN113681939 A CN 113681939A CN 202110873785 A CN202110873785 A CN 202110873785A CN 113681939 A CN113681939 A CN 113681939A
- Authority
- CN
- China
- Prior art keywords
- thermocouple
- tool
- composite
- equivalent replacement
- replacement method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006467 substitution reaction Methods 0.000 title abstract description 5
- 239000004744 fabric Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 3
- 229910000510 noble metal Inorganic materials 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 1
- 239000004945 silicone rubber Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000011810 insulating material Substances 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/0288—Controlling heating or curing of polymers during moulding, e.g. by measuring temperatures or properties of the polymer and regulating the process
-
- 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
- B29C70/34—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 shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation
- B29C70/342—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 shaping or impregnating by compression, i.e. combined with compressing after the lay-up operation using isostatic pressure
-
- 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
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
The invention belongs to a composite material forming technology, and particularly relates to an equivalent substitution method of a composite material thermocouple. And selecting the placement positions of the leading thermocouple and the lagging thermocouple on the tool. And placing a thermocouple, wherein the thermocouple is punched in the part, and the thermocouple is required to be placed at the back of the tool at the same position. The thermocouple at the back of the tool needs to be isolated by a heat insulating layer. And (5) conveying the tool into an autoclave for curing. And analyzing the curing temperature curves of the leading couple and the lagging couple of the part to obtain an equivalent lagging couple distributed on the back surface of the tool. The method has the advantages that the problem of vacuum leakage of the vacuum bag is solved, the difficulty of manufacturing the vacuum bag by an operator is reduced, and the part qualification rate is improved.
Description
Technical Field
The invention belongs to a composite material forming technology, and particularly relates to an equivalent substitution method of a composite material thermocouple.
Background
At present, various researchers have deep research on the influence of the type and the structural form of a composite material forming tool on the quality of a composite material, but the research on the heat distribution of the forming tool of a composite material part is less. The composite material tool thermal distribution represents the distribution condition of the tool workpiece temperature field in the curing process, and the temperature field distribution influences the quality and deformation control of the composite material component. The purpose of the composite material tool thermal distribution simulation is to find out a proper position for arranging a thermocouple in a tool or part allowance area, and the position is used for measuring the distribution condition of leading and lagging temperatures (namely a temperature field) of a tool workpiece in the curing process of the part, so that the rising and cooling rates of the part and whether the curing temperature can meet the requirements in the curing period are verified. When the composite material part is formed, thermocouples are respectively arranged in a part rapid temperature rising and falling area and a part slowest temperature rising and falling area to monitor the temperature change condition of the part during curing, and the thermocouples are buried in the vacuum bag, and the extended thermocouples are arranged outside the vacuum bag, so that vacuum leakage of the vacuum bag is easily caused, the difficulty of manufacturing the vacuum bag by an operator is increased, and the part qualification rate is reduced.
Disclosure of Invention
Technical scheme
An equivalent replacement method for a composite thermocouple comprises the following steps:
1. and selecting the placement positions of the leading thermocouple and the lagging thermocouple on the tool.
2. And placing a thermocouple, wherein the thermocouple is punched in the part, and the thermocouple is required to be placed at the back of the tool at the same position.
3. The thermocouple at the back of the tool needs to be isolated by a heat insulating layer.
4. And (5) conveying the tool into an autoclave for curing.
5. And analyzing the curing temperature curves of the leading couple and the lagging couple of the part to obtain an equivalent lagging couple distributed on the back surface of the tool.
Further, the tooling lead thermocouple may be located between the plies of the tooling near the autoclave can door end or near the vacuum bag.
Further, the tool hysteresis thermocouple may be located in the center of the part, in the center of the honeycomb, between the layers near the side of the tool.
Furthermore, the position of the back of the tool selected in the step 2 needs to be selected to be convenient for the worker to cloth the doll, and the depth is not too deep.
Further, the heat insulating layer and the heat insulating material mentioned in the step 3 include dry glass cloth and silicon rubber.
Further, the number of the heat insulating layers is specifically designed as follows: the fewer the number of heat insulating material layers, the faster the heat transfer, the worse the heat insulating effect, and the design of the number of heat insulating layers and the experimental heat insulating effect need to be considered according to the material and the profile thickness of the tool.
Further, before the thermocouple is placed, whether the thermocouple fails or not needs to be checked.
Furthermore, the thermocouple suggests to select a noble metal thermocouple, so that the heat distribution result is prevented from being influenced by failure during recycling.
Furthermore, 2-3 more thermocouples are recommended to be backed up in the thermocouple socket, so that the condition that a single thermocouple fails and needs to be re-coupled is avoided.
Technical effects
The problem of vacuum leakage of the vacuum bag is solved, the difficulty of manufacturing the vacuum bag by an operator is reduced, and the part qualification rate is improved.
Detailed Description
The invention is further illustrated below with reference to the use of a flow scheme:
as for the composite material, the composite material is a solid material compounded by two or more pure substances or one substance, and the material has superior performance compared with the original single material and has comprehensive effect. The composite material is artificial, is designed and manufactured according to requirements, is formed by combining the components in the related form, proportion and distribution, has obvious interfaces among the components, not only maintains the advantages of the material performance of each component, but also can obtain the comprehensive performance which cannot be achieved by a single component material through the complementation and the correlation of the properties of each component. Composite materials are mainly classified into two major categories, metallic and non-metallic.
The equivalent substitution method of the thermocouple comprises the following steps:
1. and selecting the placement positions of the leading thermocouple and the lagging thermocouple on the tool.
2. And placing a thermocouple, wherein the thermocouple is punched in the part, and the thermocouple is required to be placed at the back of the tool at the same position.
3. The thermocouple at the back of the tool needs to be isolated by a heat insulating layer.
4. And (5) conveying the tool into an autoclave for curing.
5. And analyzing the curing temperature curves of the leading couple and the lagging couple of the part to obtain an equivalent lagging couple distributed on the back surface of the tool.
Further, the tooling lead thermocouple may be located between the plies of the tooling near the autoclave can door end or near the vacuum bag.
Further, the tool hysteresis thermocouple may be located in the center of the part, in the center of the honeycomb, between the layers near the side of the tool.
Furthermore, the position of the back of the tool selected in the step 2 needs to be selected to be convenient for the worker to cloth the doll, and the depth is not too deep.
Further, the heat insulating layer and the heat insulating material mentioned in the step 3 include dry glass cloth and silicon rubber.
Further, the number of the heat insulating layers is specifically designed as follows: the fewer the number of heat insulating material layers, the faster the heat transfer, the worse the heat insulating effect, and the design of the number of heat insulating layers and the experimental heat insulating effect need to be considered according to the material and the profile thickness of the tool.
Further, before the thermocouple is placed, whether the thermocouple fails or not needs to be checked.
Furthermore, the thermocouple suggests to select a noble metal thermocouple, so that the heat distribution result is prevented from being influenced by failure during recycling.
Furthermore, 2-3 more thermocouples are recommended to be backed up in the thermocouple socket, so that the condition that a single thermocouple fails and needs to be re-coupled is avoided.
The thermocouple is a common temperature measuring element in a temperature measuring instrument, directly measures temperature, converts a temperature signal into a thermoelectric potential signal, and converts the thermoelectric potential signal into the temperature of a measured medium through an electric instrument. The shapes of various thermocouples are very different according to needs, but the basic structures of the thermocouples are approximately the same and the thermocouples are generally composed of main parts such as a thermode, an insulating sleeve protection tube, a junction box and the like.
The specific implementation mode is as follows:
1. and selecting the placement positions of the leading thermocouple and the lagging thermocouple on the tool. 2. And placing a thermocouple, wherein the thermocouple is punched in the part, and the thermocouple is required to be placed at the back of the tool at the same position.
3. The thermocouple at the back of the tool needs to be stacked with a proper amount of silica gel and isolated by a heat insulating layer.
4. And (5) conveying the tool into an autoclave for curing.
5. And analyzing the curing temperature curves of the leading couple and the lagging couple of the part to obtain an equivalent lagging couple distributed on the back surface of the tool.
And analyzing the result of the curing temperature curve to obtain a cloth image of the tool, improving and optimizing curing process parameters, improving the molding quality of the composite material member and reducing the deformation of the workpiece.
Claims (8)
1. An equivalent replacement method for a composite thermocouple is characterized by comprising the following steps:
step 1, selecting the placement positions of a leading thermocouple and a lagging thermocouple on a tool;
step 2, placing a thermocouple, wherein the thermocouple is punched in the part, and the thermocouple is required to be placed on the back of the tool at the same position;
step 3, isolating the thermocouple at the back of the tool by using a heat insulation layer;
step 4, conveying the tool into an autoclave for curing;
and 5, analyzing the curing temperature curves of the leading couple and the lagging couple of the part to obtain an equivalent lagging couple of the cloth couple on the back of the tool.
2. The equivalent replacement method for a composite thermocouple as claimed in claim 1, wherein the tooling lead thermocouple is located between the plies of the tooling near the autoclave can door end or near the vacuum bag.
3. A composite thermocouple equivalent replacement method according to claim 1, wherein the tooling hysteresis thermocouples are located at the part centre, the cell centre, between the plies near the tooling side.
4. The equivalent replacement method for the composite material thermocouple according to claim 1, wherein the step 2 of selecting the position on the back of the tool requires selecting a position where a worker can conveniently cloth the thermocouple.
5. The equivalent replacement method for a composite thermocouple according to claim 1, wherein the heat insulating layer mentioned in step 3 has both dry glass cloth and silicone rubber.
6. A composite thermocouple equivalent replacement method according to claim 1, wherein the thermocouple is tested for failure prior to placement.
7. A composite thermocouple equivalent replacement method according to claim 1, wherein the thermocouple is a noble metal thermocouple.
8. A composite thermocouple equivalent replacement method according to claim 1, wherein 2-3 thermocouple sockets are backed up to avoid single failure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110873785.3A CN113681939A (en) | 2021-07-30 | 2021-07-30 | Equivalent substitution method for composite material thermocouple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110873785.3A CN113681939A (en) | 2021-07-30 | 2021-07-30 | Equivalent substitution method for composite material thermocouple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113681939A true CN113681939A (en) | 2021-11-23 |
Family
ID=78578702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110873785.3A Pending CN113681939A (en) | 2021-07-30 | 2021-07-30 | Equivalent substitution method for composite material thermocouple |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113681939A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938185A (en) * | 2013-01-21 | 2014-07-23 | 中国兵器工业第五九研究所 | Preparation method for inner hole coating of tubular part |
| CN206519899U (en) * | 2017-03-10 | 2017-09-26 | 成都联科航空技术有限公司 | A kind of modularization installs the frock of thermocouple |
| CN107471688A (en) * | 2017-07-12 | 2017-12-15 | 昌河飞机工业（集团）有限责任公司 | A kind of method for reducing autoclave molding vacuum bag gas leakage |
| CN207509778U (en) * | 2017-10-30 | 2018-06-19 | 成都飞机工业（集团）有限责任公司 | A kind of molding temperature control equipment of composite material |
| CN110014664A (en) * | 2019-04-03 | 2019-07-16 | 西安飞机工业（集团）有限责任公司 | A kind of forming method of deep camber type face PMI cystosepiment |
| CN209191347U (en) * | 2018-11-28 | 2019-08-02 | 中航复合材料有限责任公司 | The thermometric pipeline of fiber preform internal temperature in a kind of on-line measurement mold |
-
2021
- 2021-07-30 CN CN202110873785.3A patent/CN113681939A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938185A (en) * | 2013-01-21 | 2014-07-23 | 中国兵器工业第五九研究所 | Preparation method for inner hole coating of tubular part |
| CN206519899U (en) * | 2017-03-10 | 2017-09-26 | 成都联科航空技术有限公司 | A kind of modularization installs the frock of thermocouple |
| CN107471688A (en) * | 2017-07-12 | 2017-12-15 | 昌河飞机工业（集团）有限责任公司 | A kind of method for reducing autoclave molding vacuum bag gas leakage |
| CN207509778U (en) * | 2017-10-30 | 2018-06-19 | 成都飞机工业（集团）有限责任公司 | A kind of molding temperature control equipment of composite material |
| CN209191347U (en) * | 2018-11-28 | 2019-08-02 | 中航复合材料有限责任公司 | The thermometric pipeline of fiber preform internal temperature in a kind of on-line measurement mold |
| CN110014664A (en) * | 2019-04-03 | 2019-07-16 | 西安飞机工业（集团）有限责任公司 | A kind of forming method of deep camber type face PMI cystosepiment |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211123 |
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| RJ01 | Rejection of invention patent application after publication |