CN115091782A - Manufacturing method of shrinkage section ablation-resistant molded part - Google Patents
Manufacturing method of shrinkage section ablation-resistant molded part Download PDFInfo
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- CN115091782A CN115091782A CN202210718242.9A CN202210718242A CN115091782A CN 115091782 A CN115091782 A CN 115091782A CN 202210718242 A CN202210718242 A CN 202210718242A CN 115091782 A CN115091782 A CN 115091782A
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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
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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
- 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
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- 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 shrinkage section ablation-resistant molded part comprises a prefabricated body, a molded material, a male mold, a female mold and a binding block; the male die can be inserted into the female die to form a die body, the fastening block is arranged at the end part of the male die, and the prefabricated body is sleeved at the outer side of 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 is in butt joint with the female mould, the prefabricated body and the mould pressing material are combined into a whole. The 2.5D braided structure is not layered when subjected to the scouring of high-temperature flame, has large thermal resistance in the thickness direction, and can reduce the outward transfer of heat. And the die pressing process is adopted, so that the production period is short, 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 shrinkage section ablation-resistant die pressing piece.
Background
Carbon fiber chopped strand die-casting parts are generally adopted in the convergence section ablation-resistant layer of the modern composite material solid rocket engine, and high-performance carbon/carbon materials are adopted in the high-performance composite material. The widespread adoption of high performance carbon/carbon materials is a luxury for tactical missiles that are relatively price sensitive. Although the ablation resistance layer of the convergent section manufactured by adopting the carbon fiber short cut filament die pressing is low in cost, the ablation resistance performance is poor. In order to exert the advantage of high strength of the carbon fiber, the length of the short cut carbon fiber is usually dozens of mm, and the agglomeration phenomenon is easy to occur in the mixing and pressing process, so that the performance of each part of a finished product is inconsistent in a macroscopic scale, and the agglomeration and falling phenomena can occur in use.
Disclosure of Invention
The invention aims to provide a manufacturing method of a shrinkage section ablation-resistant molded part, which aims to solve the problem that in the prior art, the performances of all parts of a finished product are inconsistent in a macroscopic scale, and the phenomenon of blocking and falling off can occur in use.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of manufacturing a convergent-section ablation-resistant molded article, based on a molded article manufacturing apparatus comprising: comprises a prefabricated body, a mould pressing material, a male mould, a female mould and a binding block; the male die can be inserted into the female die to form a die body, the fastening block is arranged at the end part of the male die, and the prefabricated body is sleeved on the outer side of 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 is butted with the female mould, 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 prefabricated body and the carbon fiber short cut thread to be used as a mould pressing material;
the method comprises the following steps of (1) firmly sucking a fastening block at the end part of a male die, tightly sleeving a prefabricated body on the male die, fastening a process reserved lengthened section at the end part of the male die to the outer circle of the fastening block, and cutting off redundant length;
weighing carbon fiber short shreds according to the process requirements, filling the carbon fiber short shreds into a female die, pre-compacting the carbon fiber short shreds by using a false male die with the size larger than that of the male die, then closing the male die and the female die with pre-impregnated prefabricated bodies, placing the male die and the female die in a press, heating and pressurizing, and preserving heat and pressure to solidify the male die and the female die into a whole;
and (4) machining after demoulding, and removing redundant parts including the fastening blocks to obtain the ablation-resistant die pressing piece with the three-dimensional preform lining.
Further, the prefabricated body is a pre-impregnated carbon fiber three-dimensional prefabricated body lining; the mould pressing material is carbon fiber chopped strand mould pressing material which is pre-dipped.
Furthermore, the carbon fiber three-dimensional prefabricated body lining adopts a 2.5D shallow-crossing-bending-connected tubular braided structure.
Furthermore, the resin used for pre-dipping the carbon fiber three-dimensional preform is the same as or compatible with the resin used for pre-dipping the carbon fiber chopped strands.
Furthermore, the resin content of the prepreg three-dimensional preform is 25% -35%, and the resin content of the prepreg carbon fiber short cut filament is 35% -45%.
Furthermore, an annular groove is formed in the outer surface of the binding block.
Furthermore, the position of the prefabricated body at the end part of the male die is reserved with a lengthening section for the process, and the prefabricated body is bound on the outer circle of the binding block by a binding belt.
Further, the bottom of the female die is provided with a demolding ejector block.
Furthermore, a guide post is also arranged on the female die.
Furthermore, the binding block is made of ferromagnetic materials with high 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, and besides various advantages of carbon fibers, the carbon fiber bundles of the preform are orderly interwoven in a three-dimensional weaving structure, so that the carbon fiber three-dimensional preform cannot be layered and blocked to fall off when subjected to high-temperature, high-pressure and high-speed flame, and the erosion resistance and the ablation rate of the carbon fiber three-dimensional preform are obviously superior to those of a carbon fiber chopped strand die casting piece. The composite material reinforced by the carbon fiber three-dimensional preform is combined with the carbon fiber chopped strand reinforced mould pressing composite material, the three-dimensional preform with relatively thin thickness is used as the inner surface of the convergence section to directly resist the flame washing of the convergence section of the combustion chamber, and the chopped strand mould pressing material is used as the back support material, so that the ablation rate of the convergence section can be greatly reduced and the weight of the ablation resistant layer of the convergence section can be reduced under the condition that the cost is not increased much. The 2.5D braided structure has large thermal resistance in the thickness direction, and can reduce the outward transfer of heat. And the die pressing process is adopted, so that the production period is short, and the product has high precision and good consistency.
Drawings
FIG. 1 is a schematic drawing of a converging section ablation resistant molded part with a three dimensional preform liner,
FIG. 2 is a schematic view of a tightening block
FIG. 3 is a schematic view of a convergent section ablation resistant member
Wherein: 1-male die, 2-female die, 3-demoulding jacking block, 4-guide post, 5-prefabricated body, 6-mould pressing material, 7-binding block and 8-binding band.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
a shrinkage section ablation-resistant die pressing piece with a three-dimensional preform lining comprises a pre-dipped carbon fiber three-dimensional preform lining and a pre-dipped carbon fiber chopped strand die pressing material, which are respectively put into a die, heated and pressurized, and then are subjected to heat preservation and pressure preservation to be cured into a whole.
Furthermore, the carbon fiber three-dimensional prefabricated body lining adopts a 2.5D shallow-crossing-bending-connected tubular braided structure.
Further, the resin used for pre-dipping the carbon fiber three-dimensional preform is the same as the resin used for pre-dipping the carbon fiber chopped strands.
Furthermore, the resin content of the prepreg three-dimensional preform is 25% -35%, and the resin content of the prepreg carbon fiber short cut filament is 35% -45%.
Furthermore, a binding block with an annular groove on the outer circle is arranged at the small end of the prepreg three-dimensional prefabricated body.
The invention relates to an ablation-resistant die pressing piece for a convergence section with a three-dimensional preform lining, which adopts the same or compatible resin to pre-dip carbon fiber three-dimensional preforms and carbon fiber short shreds as a die pressing material, wherein a binding block is firmly absorbed at the end part of a male die, then the preforms are tightly sleeved on the male die, a small-end process reserved lengthening section is tightly bound at the excircle of the binding block, and the redundant length is cut off; weighing a proper amount of carbon fiber short shreds according to the process requirements, filling the carbon fiber short shreds into a female die, pre-compacting the carbon fiber short shreds by using a false male die with the size slightly larger than that of the male die, then closing the male die and the female die with a pre-impregnated prefabricated body, placing the male die and the female die in a press, heating and pressurizing, and preserving heat and pressure to solidify the male die and the female die into a whole; and (4) machining after demoulding, and removing redundant parts including the fastening blocks to obtain the shrinkage section ablation-resistant molded part with the three-dimensional preform lining.
The carbon fiber three-dimensional preform lining adopts a 2.5D shallow-cross-bending connected tubular weaving structure, has the characteristic of large thermal resistance in the thickness direction, and the inner profile of the mould pressing piece is not processed, so that the continuity of the fiber of the preform is kept, the external temperature is favorably reduced, and the ablation resistance of the preform is favorably improved.
Example 1:
a shrinkage section ablation-resistant die pressing piece with a three-dimensional preform lining is characterized in that phenolic resin is used for pre-dipping a carbon fiber three-dimensional preform 5 and a carbon fiber short cut wire 6 to serve as a die pressing material, the resin content of the pre-dipped rubber three-dimensional preform is 30%, and the resin content of the pre-dipped rubber carbon fiber short cut wire is 40%. Firstly, firmly absorbing a binding block 7 at the end part of a male die 1, then tightly sleeving a prefabricated body 5 on the male die 1, binding a small-end process reserved lengthening section on the excircle of the binding block 7 by using a binding belt 8, and cutting off redundant length; weighing a proper amount of carbon fiber short shreds 6 according to the process requirements, filling the carbon fiber short shreds into a female die 2, pre-compacting the carbon fiber short shreds by using a false male die with the size slightly larger than that of the male die 1, aligning a positioning hole on the male die 1 with a positioning guide pillar 4 on the female die 2, closing the male die 1 and the female die 2 with a pre-impregnated prefabricated body 5, placing the male die 1 and the female die 2 under a pressure head of a press machine, heating and pressurizing, and preserving heat and pressure for a certain time to solidify the male die and the female die into a whole; after demolding, machining was carried out to remove the excess including the tie blocks 7, and the convergent-section ablation-resistant molded article having a three-dimensional preform inner liner shown in FIG. 3 was obtained.
The binding block 7 is a cylinder with the same outer diameter as the male die, and a plurality of annular grooves are processed on the outer circumferential surface of the binding block, and are used for binding the end parts of the prefabricated bodies 5 and preventing the prefabricated bodies from slipping off, as shown in figure 2. The binding block 7 is preferably made of high carbon steel or other material with high Curie temperature and large remanence, and is magnetized by a piece of magnetic steel or an electrified coil before use so as to be absorbed by the end part of the male die 1.
The carbon fiber three-dimensional preform 5 is of a 2.5D shallow-cross-bending connected tubular braided structure and has the characteristic of high thermal resistance in the thickness direction, and the inner profile of the molded piece is not processed, so that the continuity of the fibers of the preform is kept, the heat transfer to the outside is reduced, the temperature of a spray pipe shell can be reduced, and the ablation resistance of the preform is improved.
The above description is only the most typical embodiment of the present invention, but the scope of the present invention is not limited thereto. The data listed are also only intended to describe the working principle of the invention and do not represent necessary values. Any equivalent changes or substitutions which can be easily made by those skilled in the art of fiber composite production within the technical scope of the present disclosure are intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. A method for manufacturing a convergent-section ablation-resistant molded article, characterized by comprising, based on a molded article manufacturing apparatus, the apparatus comprising: comprises a prefabricated body (5), a mould pressing material (6), a male mould (1), a female mould (2) and a binding block (7); the male die (1) can be inserted into the female die (2) to form a die body, the binding block (7) is arranged at the end of the male die (1), and the prefabricated body (5) is sleeved on the outer side of 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 butted 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 prefabricated body and the carbon fiber short cut thread to be used as a mould pressing material;
firstly, firmly absorbing a fastening block at the end part of a male die, then tightly sleeving a prefabricated body on the male die, fastening a process reserved lengthening section at the end part of the male die on the excircle of the fastening block, and cutting off redundant length;
weighing carbon fiber short shreds according to the process requirements, filling the carbon fiber short shreds into a female die, pre-compacting the carbon fiber short shreds by using a false male die with the size larger than that of the male die, then closing the male die and the female die with pre-impregnated prefabricated bodies, placing the male die and the female die in a press, heating and pressurizing, and preserving heat and pressure to solidify the male die and the female die into a whole;
and (4) machining after demolding, and removing redundant parts including the fastening blocks to obtain the shrinkage section ablation-resistant molded piece with the three-dimensional preform lining.
2. The method for manufacturing a convergent-section ablation-resistant die-pressed article according to claim 1, wherein the preform (5) is a pre-impregnated carbon fiber three-dimensional preform inner liner; the mould pressing material (6) is a carbon fiber chopped strand mould pressing material presoaked with glue.
3. The method of claim 2, wherein the carbon fiber three-dimensional preform liner is of a 2.5D shallow-cross-linked tubular braid structure.
4. The method for manufacturing an ablation-resistant die-molded part with a convergent section according to claim 2, wherein the resin used for pre-dipping the three-dimensional carbon fiber preform is the same as or compatible with the resin used for pre-dipping the chopped carbon fiber filaments.
5. The method for manufacturing the convergent section ablation-resistant molded part 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 short cut filament is 35-45%.
6. The method of manufacturing a convergent-section ablation-resistant die-pressed member according to claim 1, wherein the outer surface of the binding block (7) is provided with an annular groove.
7. The method for manufacturing a convergent-section ablation-resistant die-pressed part according to claim 1, characterized in that the position of the preform (5) at the end of the male die (1) is reserved with an elongated section for the process, where the preform (5) is bound to the outer circle of the binding block (7) by a binding band (8).
8. The method for manufacturing a convergent-section ablation-resistant molded article according to claim 1, wherein the bottom of the female mold (2) is provided with a stripper top block (3).
9. The method for manufacturing a convergent-section ablation-resistant die-pressed part according to claim 1, wherein the female die (2) is further provided with guide posts (4).
10. The method for manufacturing the convergent-section ablation-resistant die-pressed member according to claim 1, wherein the binding block (7) is made of a ferromagnetic material having 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115091782A true CN115091782A (en) | 2022-09-23 |
| CN115091782B CN115091782B (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210718242.9A Active CN115091782B (en) | 2022-06-21 | 2022-06-21 | Manufacturing method of ablation-resistant molding part with convergent section |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110244150A1 (en) * | 2010-03-31 | 2011-10-06 | The Boeing Company | Unitized Engine Nacelle Structure |
| US20130087955A1 (en) * | 2010-04-20 | 2013-04-11 | Snecma | Device for manufacturing a casing made of a composite material and manufacturing method using such a device |
| US20170305232A1 (en) * | 2016-04-20 | 2017-10-26 | Toledo Molding & Die, Inc. | Method of Making an Acoustic Automotive HVAC and AIS Duct with a Particle Fiber Slurry |
| 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 |
-
2022
- 2022-06-21 CN CN202210718242.9A patent/CN115091782B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110244150A1 (en) * | 2010-03-31 | 2011-10-06 | The Boeing Company | Unitized Engine Nacelle Structure |
| US20130087955A1 (en) * | 2010-04-20 | 2013-04-11 | Snecma | Device for manufacturing a casing made of a composite material and manufacturing method using such a device |
| US20170305232A1 (en) * | 2016-04-20 | 2017-10-26 | Toledo Molding & Die, Inc. | Method of Making an Acoustic Automotive HVAC and AIS Duct with a Particle Fiber Slurry |
| 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 | Publication date |
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| CN115091782B (en) | 2023-09-05 |
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