CN115091782B - Manufacturing method of ablation-resistant molding part with convergent section - Google Patents
Manufacturing method of ablation-resistant molding part with convergent section Download PDFInfo
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- CN115091782B CN115091782B CN202210718242.9A CN202210718242A CN115091782B CN 115091782 B CN115091782 B CN 115091782B CN 202210718242 A CN202210718242 A CN 202210718242A CN 115091782 B CN115091782 B CN 115091782B
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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
- B29C70/40—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/14—Making preforms characterised by structure or composition
- B29B11/16—Making preforms characterised by structure or composition comprising fillers or reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
- B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
- B29B15/10—Coating or impregnating independently of the moulding or shaping step
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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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/748—Machines or parts thereof not otherwise provided for
- B29L2031/749—Motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/40—Weight reduction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
A manufacturing method of a convergent section ablation-resistant molding part comprises a prefabricated body, a molding material, a male mold, a female mold and a fastening block; the male die can be inserted into the female die to form a die main body, the fastening block is arranged at the end part of the male die, and the prefabricated body is sleeved outside the end part of the male die; the mould pressing material is arranged on the inner side of the female mould, and when the male mould and the female mould are in butt joint, the prefabricated body and the mould pressing material are combined into a whole. The 2.5D woven structure is not layered when being subjected to scouring of high-temperature flame, has high thermal resistance in the thickness direction, and can reduce heat transfer outwards. The die pressing process is adopted, the production period is short, and the product precision is high and the consistency is good.
Description
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to a manufacturing method of a convergence section ablation-resistant molding part.
Background
The ablation-resistant layer of the convergence section of the modern composite solid rocket engine generally adopts a carbon fiber chopped strand molding piece, and the higher-performance composite solid-shooting also adopts a high-performance carbon/carbon material. For tactical missiles that are more price sensitive, high performance carbon/carbon materials are also a luxury option. The convergence section ablation-resistant layer manufactured by adopting the carbon fiber chopped strand molding has low cost but poor ablation resistance. In order to exert the advantage of high strength of the carbon fiber, the length of the chopped carbon fiber is usually tens of mm, and the agglomeration phenomenon is easy to occur in the mixing and pressing processes, so that the property of each part of a finished product is inconsistent on a macroscopic scale, and the agglomeration and falling phenomenon can occur in use.
Disclosure of Invention
The invention aims to provide a manufacturing method of a convergence section ablation-resistant molding part, which aims to solve the problem that the performances of all parts of a finished product are inconsistent on a macroscopic scale in the prior art, and the phenomenon of blocking and falling off can occur in use.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method of manufacturing a converging section ablation-resistant molded part, based on a molded part manufacturing apparatus, the molded part manufacturing apparatus comprising: comprises a prefabricated body, a mould pressing material, a male mould, a female mould and a fastening block; the male die can be inserted into the female die to form a die main body, the fastening block is arranged at the end part of the male die, and the prefabricated body is sleeved outside the male die; the mould pressing material is arranged between the inner sides of the prefabricated body and the female mould, and when the male mould and the female mould are in butt joint, the prefabricated body and the mould pressing material are combined into a whole;
the method comprises the following steps:
the same or compatible resin is adopted to carry out presoaking on the carbon fiber three-dimensional preform and the carbon fiber chopped filaments to be used as a material for mould pressing;
firstly, firmly sucking the fastening block at the end part of the male die, then tightly sleeving the prefabricated body on the male die, fastening the process reserved extension section at the end part of the male die at the outer circle of the fastening block, and cutting off the redundant length;
weighing carbon fiber chopped filaments according to the technological requirements, loading the chopped filaments into a female die, pre-compacting the chopped filaments by a false male die with the size larger than that of the male die, then closing the die by the male die with the prepreg preform and the female die, placing the die and the female die into a press, heating, pressurizing, preserving heat and pressure to enable the die and the female die to be solidified into a whole;
and (3) after demolding, machining, and removing redundant parts including the fastening blocks to obtain the convergent section ablation-resistant molding part with the three-dimensional preform lining.
Further, the preform is a carbon fiber three-dimensional preform liner of prepreg; the molding material is a carbon fiber chopped filament molding material of presoaked glue.
Further, the carbon fiber three-dimensional preform liner adopts a 2.5D shallow-crosslinked tubular braided structure.
Further, the resin adopted by the carbon fiber three-dimensional preform prepreg is the same as or compatible with the resin adopted by the carbon fiber chopped strand prepreg.
Further, the resin content of the prepreg three-dimensional preform is 25% -35%, and the resin content of the prepreg carbon fiber chopped filaments is 35% -45%.
Further, the outer surface of the tightening block is provided with an annular groove.
Further, the position of the prefabricated body at the end part of the male die is reserved with an extension section for the process, and the prefabricated body is bound on the outer circle of the binding block by using a binding belt.
Further, a demoulding top block is arranged at the bottom of the female mould.
Furthermore, the female die is also provided with a guide post.
Furthermore, the binding block is made of ferromagnetic materials with higher remanence.
Compared with the prior art, the invention has the following technical effects:
the carbon fiber three-dimensional preform is used as a reinforcing material of a composite material, the carbon fiber bundles of the three-dimensional woven structure are orderly interwoven with each other besides various advantages of carbon fibers, and the carbon fiber three-dimensional preform cannot be layered and fall off in a lump when bearing high-temperature, high-pressure and high-speed flames, and has anti-scouring and ablation rates remarkably superior to those of a carbon fiber chopped filament molding. The composite material reinforced by the carbon fiber three-dimensional preform and the carbon fiber chopped strand reinforced molding composite material are combined, the three-dimensional preform with relatively small thickness is used as the inner surface of the convergence section to directly resist flame scouring of the convergence section of the combustion chamber, and the chopped strand molding material is used as the back support material, so that the ablation rate of the convergence section and the weight of the ablation-resistant layer of the convergence section can be greatly reduced under the condition of low cost. The 2.5D woven structure has large thermal resistance in the thickness direction, and can reduce heat transfer to the outside. The die pressing process is adopted, the production period is short, and the product precision is high and the consistency is good.
Drawings
Figure 1 is a schematic molding diagram of a converging section ablation resistant molded article with a three-dimensional preform liner,
FIG. 2 is a schematic view of a tightening block
FIG. 3 is a schematic view of a converging section ablation resistant member
Wherein: 1-male die, 2-female die, 3-demoulding top block, 4-guide pillar, 5-prefabricated body, 6-mould pressing material, 7-fastening block and 8-binding tape.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
a convergent section ablation-resistant molding part with a three-dimensional preform lining comprises a carbon fiber three-dimensional preform lining with prepreg and carbon fiber chopped strand molding materials with prepreg, which are respectively filled into a mold, heated and pressurized, and kept at a constant temperature and pressure to be solidified into a whole.
Further, the carbon fiber three-dimensional preform liner adopts a 2.5D shallow-crosslinked tubular braided structure.
Further, the resin adopted by the carbon fiber three-dimensional preform prepreg is the same as the resin adopted by the carbon fiber chopped strand prepreg.
Further, the resin content of the prepreg three-dimensional preform is 25% -35%, and the resin content of the prepreg carbon fiber chopped filaments is 35% -45%.
Furthermore, a tightening block with an annular groove on the outer circle is arranged at the small end of the prepreg three-dimensional preform.
The invention relates to an ablation-resistant molding piece with a convergent section of a three-dimensional preform lining, which adopts the same or compatible resin to presoak a carbon fiber three-dimensional preform and a carbon fiber chopped filament as molding materials, firstly firmly sucking a fastening block at the end part of a male mold, then tightly sleeving the preform on the male mold, tightly fastening a process reserved lengthened section of a small end on the outer circle of the fastening block, and cutting off redundant length; weighing a proper amount of carbon fiber chopped filaments according to the process requirements, filling the chopped filaments into a female die, pre-compacting the chopped filaments by a false male die with the size slightly larger than that of the male die, then closing the die by the male die with the prepreg preform and the female die, placing the die in a press, heating, pressurizing, preserving heat and pressure to enable the die to be solidified into a whole; and (3) after demolding, machining, and removing redundant parts including the fastening blocks to obtain the convergent section ablation-resistant molding with the three-dimensional preform lining.
The carbon fiber three-dimensional preform liner adopts a 2.5D shallow-crosslinked tubular woven structure, has the characteristic of large thermal resistance in the thickness direction, and the inner surface of the molding part is not processed, so that the fiber of the preform maintains continuity, and the method is beneficial to reducing the external temperature and improving the ablation resistance of the preform.
Example 1:
a convergent section ablation-resistant molding part with a three-dimensional preform lining adopts phenolic resin to presoak a carbon fiber three-dimensional preform 5 and a carbon fiber chopped filament 6 as molding materials, wherein the resin content of the presoak three-dimensional preform is 30%, and the resin content of the presoak carbon fiber chopped filament is 40%. Firstly, firmly sucking the fastening block 7 at the end part of the male die 1, then tightly sleeving the prefabricated body 5 on the male die 1, binding a process reserved extension section of the small end on the outer circle of the fastening block 7 by using a binding belt 8, and cutting off the redundant length; weighing a proper amount of carbon fiber chopped filaments 6 according to the technological requirements, loading the chopped filaments into a female die 2, pre-compacting the chopped filaments by a false male die with the size slightly larger than that of a male die 1, aligning a positioning hole on the male die 1 with a positioning guide post 4 on the female die 2, closing the die of the male die 1 and the female die 2 with a prepreg preform 5, placing the die under a pressing head of a press, heating and pressurizing the die, and preserving heat and pressure for a certain time to enable the die to be solidified into a whole; after demolding, machining is performed, and excess parts including the fastening block 7 are removed, so that the convergent section ablation-resistant molded part with the three-dimensional preform lining shown in fig. 3 can be obtained.
The fastening block 7 is a cylinder with the same outer diameter as the male die, as shown in fig. 2, and has a plurality of annular grooves formed on the outer circumferential surface thereof for fastening the end of the preform 5, thereby preventing slipping. The binding block 7 is preferably made of high-carbon steel materials with higher Curie temperature and larger remanence, and is magnetized by a piece of magnetic steel or an electrified coil before use, so that the binding block can be sucked with the end part of the male die 1.
The carbon fiber three-dimensional preform 5 adopts a 2.5D shallow-crosslinked tubular weaving structure, has the characteristic of large thermal resistance in the thickness direction, and the inner surface of the molding part is not processed, so that the fiber of the preform maintains continuity, the heat transfer to the outside is reduced, the temperature of the spray pipe shell can be reduced, and the ablation resistance of the preform can be improved.
The above description is only the most typical embodiment of the invention, but the scope of the invention is not limited thereto. The data set forth are also merely illustrative of the principles of the present invention and are not intended to represent unnecessary numbers. Any equivalent modifications or substitutions easily occur to those skilled in the art of fiber composite production within the scope of the present disclosure, and are intended to be encompassed by the claims of the present invention.
Claims (10)
1. A method of manufacturing a converging section ablation-resistant molded part, characterized by a manufacturing apparatus based on a molded part, the manufacturing apparatus comprising: comprises a preform (5), a mould pressing material (6), a male mould (1), a female mould (2) and a fastening block (7); the male die (1) can be inserted into the female die (2) to form a die main body, the fastening block (7) is arranged at the end part of the male die (1), and the prefabricated body (5) is sleeved outside the male die (1); the mould pressing material (6) is arranged between the prefabricated body and the inner side of the female mould (2), and when the male mould (1) is in butt joint with the female mould (2), the prefabricated body (5) and the mould pressing material (6) are combined into a whole;
the method comprises the following steps:
the same or compatible resin is adopted to carry out presoaking on the carbon fiber three-dimensional preform and the carbon fiber chopped filaments to be used as a material for mould pressing;
firstly, firmly sucking the fastening block at the end part of the male die, then tightly sleeving the prefabricated body on the male die, fastening the process reserved extension section at the end part of the male die at the outer circle of the fastening block, and cutting off the redundant length;
weighing carbon fiber chopped filaments according to the technological requirements, loading the chopped filaments into a female die, pre-compacting the chopped filaments by a false male die with the size larger than that of the male die, then closing the die by the male die with the prepreg preform and the female die, placing the die and the female die into a press, heating, pressurizing, preserving heat and pressure to enable the die and the female die to be solidified into a whole;
and (3) after demolding, machining, and removing redundant parts including the fastening blocks to obtain the convergent section ablation-resistant molding part with the three-dimensional preform lining.
2. The method for manufacturing a convergent section ablation resistant molded article according to claim 1, wherein the preform (5) is a carbon fiber three-dimensional preform liner of prepreg; the molding material (6) is a carbon fiber chopped filament molding material of presoaked glue.
3. The method of manufacturing a converging section ablation-resistant molded article according to claim 2, wherein the carbon fiber three-dimensional preform liner is of a 2.5D shallow cross-linked tubular braid construction.
4. The method of manufacturing a converging section ablation-resistant molded article according to claim 2, wherein the resin used for the carbon fiber three-dimensional preform prepreg is the same as or compatible with the resin used for the carbon fiber chopped strand prepreg.
5. The method for manufacturing the ablation-resistant molding of the convergent section according to claim 4, wherein the resin content of the prepreg three-dimensional preform is 25% -35%, and the resin content of the prepreg carbon fiber chopped filaments is 35% -45%.
6. A method of manufacturing a converging section ablation resistant moulding according to claim 1, characterised in that the outer surface of the tightening block (7) is provided with an annular groove.
7. A method of manufacturing a converging section ablation resistant moulding according to claim 1, characterized in that the preform (5) is positioned at the end of the male mould (1) with a pre-stretch for the process, where the preform (5) is tied up with a tie (8) to the outer circumference of the tightening block (7).
8. A method of manufacturing a converging section ablation resistant moulding according to claim 1, characterized in that the bottom of the female mould (2) is provided with a stripper shoe (3).
9. The method for manufacturing a converging section ablation-resistant molding according to claim 1, wherein the female die (2) is further provided with a guide post (4).
10. A method of manufacturing a convergent section ablation resistant moulding according to claim 1, characterised in that the tightening blocks (7) are made of ferromagnetic material with a high remanence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210718242.9A CN115091782B (en) | 2022-06-21 | 2022-06-21 | Manufacturing method of ablation-resistant molding part with convergent section |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210718242.9A CN115091782B (en) | 2022-06-21 | 2022-06-21 | Manufacturing method of ablation-resistant molding part with convergent section |
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| CN115091782A CN115091782A (en) | 2022-09-23 |
| CN115091782B true CN115091782B (en) | 2023-09-05 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111997781A (en) * | 2020-07-17 | 2020-11-27 | 上海复合材料科技有限公司 | Composite material diffusion section forming method based on RTM (resin transfer molding) process semi-cured surface |
| CN114103159A (en) * | 2021-10-27 | 2022-03-01 | 株洲飞鹿高新材料技术股份有限公司 | Forming die and method for high-precision thin-shell structure composite material wave-transparent radome |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8220588B2 (en) * | 2010-03-31 | 2012-07-17 | The Boeing Company | Unitized engine nacelle structure |
| FR2958875B1 (en) * | 2010-04-20 | 2017-07-07 | Snecma | DEVICE FOR MANUFACTURING A CASE OF COMPOSITE MATERIAL AND MANUFACTURING METHOD USING SUCH A DEVICE |
| JP2019521873A (en) * | 2016-04-20 | 2019-08-08 | トレド モールディング アンド ダイ インコーポレイテッド | Method for making acoustic vehicle HAC, AIS duct with fiber slurry |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111997781A (en) * | 2020-07-17 | 2020-11-27 | 上海复合材料科技有限公司 | Composite material diffusion section forming method based on RTM (resin transfer molding) process semi-cured surface |
| CN114103159A (en) * | 2021-10-27 | 2022-03-01 | 株洲飞鹿高新材料技术股份有限公司 | Forming die and method for high-precision thin-shell structure composite material wave-transparent radome |
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