CN113147009A - Process method for winding and forming engine shell by large-size fiber with chemical - Google Patents
Process method for winding and forming engine shell by large-size fiber with chemical Download PDFInfo
- Publication number
- CN113147009A CN113147009A CN202110272163.5A CN202110272163A CN113147009A CN 113147009 A CN113147009 A CN 113147009A CN 202110272163 A CN202110272163 A CN 202110272163A CN 113147009 A CN113147009 A CN 113147009A
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- winding
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- shell
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Classifications
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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
- B29C70/06—Fibrous reinforcements only
-
- 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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/56—Winding and joining, e.g. winding spirally
- B29C53/562—Winding and joining, e.g. winding spirally spirally
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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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/80—Component parts, details or accessories; Auxiliary operations
- B29C53/8008—Component parts, details or accessories; Auxiliary operations specially adapted for winding and joining
- B29C53/8041—Measuring, controlling or regulating
-
- 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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/80—Component parts, details or accessories; Auxiliary operations
- B29C53/8008—Component parts, details or accessories; Auxiliary operations specially adapted for winding and joining
- B29C53/8066—Impregnating
-
- 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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/80—Component parts, details or accessories; Auxiliary operations
- B29C53/82—Cores or mandrels
- B29C53/821—Mandrels especially adapted for winding and joining
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Moulding By Coating Moulds (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
A process method for winding and forming an engine shell by large-size fibers with chemicals relates to environmental control of a large-size winding and forming production workshop, a low-temperature resin fiber dipping process and introduction of a winding process with chemicals. The method solves the problem of large-size winding safety with the chemical, accurately controls the low-temperature curing resin impregnation effect and controls the volume content of the fiber. The implementation method is a mode of remote monitoring winding, constant quantitative glue preparation at any time and fiber impregnation layer by layer. The invention not only can overcome the process difficulty in the manufacturing of the steel shell, but also has the characteristics of high strength and light weight, and can avoid cracking of the powder column due to the solidification and shrinkage of the propellant in the adherence pouring scheme, and avoid the damage of the shell due to the expansion of the combustion surface when the shell works because the heat insulation layer is debonded from the bonding surface of the powder column.
Description
Technical Field
The invention relates to a process method for winding and forming a large-size fiber engine shell with chemicals, and belongs to the technical field of winding and forming processes.
Background
The prior art winding formed engine casings generally cannot be wound with the chemical, because the engine casings are filled with solid propellant, the chemical winding is very dangerous along with the increase of the danger level of the chemical column, and particularly, the casings with the diameter of more than 400mm are required to be used at present, wherein the medicine filling amount is larger, the operation is more difficult and the danger is more serious.
And the existing composite material engine shell forming process mostly adopts a common wet winding mode, a certain amount of resin can be stored in the glue groove, if low-temperature curing resin is selected, when the indoor temperature is higher, the phenomenon of implosion is easy to occur, and the field control is not facilitated.
Disclosure of Invention
The invention provides a process method for winding and forming an engine shell by large-size fibers with chemicals, aiming at solving the technical problems that the process method for winding and forming the engine shell by large-size fibers with chemicals is not beneficial to field control, propellant filled in the engine shell formed by winding and forming the large-size fibers with the chemicals has certain danger, and resin is low-temperature cured resin, if a common wet winding mode is adopted, a certain amount of resin can be stored in a glue groove, the indoor temperature is high, the phenomenon of implosion is easy to occur, and the technical problem is solved.
The invention provides a process method for winding and forming a large-size fiber with chemicals into an engine shell, which specifically comprises the following steps:
the method comprises the following steps of firstly, controlling the temperature and humidity of an explosion-proof workshop, arranging a coated grain core mold on a winding machine, placing the winding machine in the explosion-proof workshop, and installing an explosion-proof workshop static removing device and remote explosion-proof monitoring equipment;
step two, preparing low-temperature curing resin of an epoxy resin system, operating a remote control winding device,
thirdly, the fiber passes through a guide roller of a winding machine, the fiber is wound on a core mold of the coating grain by the setting program of the winding machine, the winding angle is 17-25 degrees,
step four, when the number of spiral winding layers reaches 1/3, pausing winding, impregnating a certain amount of low-temperature curing resin on the fiber surface, after the impregnation is finished, using a glue absorption felt to absorb glue on the shell fiber surface, after the surface composite material layer is cured to a certain extent, carrying out surface treatment, and then carrying out secondary winding;
and step five, starting the winding equipment to continue winding, pausing winding when the winding is performed according to a program 2/3, coating the glue, absorbing the glue, performing surface treatment, and repeatedly dipping the fibers layer by layer until the fibers are fully distributed on the surface of the core mold of the coated grain.
Preferably, in the step one, the temperature of the explosion-proof workshop is controlled to be between 15 and 20 ℃, and the humidity is controlled to be between 40 and 60 percent.
Preferably, in step three, the fibers used are carbon fibers or glass fibers, and each mass of fibers is weighed before winding.
Preferably, in the third step, the fiber passes through a rubber roller and a filament nozzle, the tension of each fiber is measured by using a tension measuring instrument, and the tension of the single fiber bundle is controlled to be 10N-15N.
Preferably, the winding program is set remotely and the winding process is monitored, the winding speed is gradually increased, and the final speed is less than 1800 degrees/min.
Preferably, in the fifth step, the fiber winding angle is 17-25 degrees, and the single-bundle fiber winding tension is 10N-15N.
Preferably, the low-temperature curing resin consists of epoxy resin, epoxy diluent, curing agent and heterocyclic accelerator.
Preferably, in step four, the impregnated fibers require uniform application of resin from one side of the mandrel to the other.
Preferably, in step four, the glue has to be sucked with too much force and is processed from one layer of the core mould to the other.
Preferably, after the winding is finished, the remaining fiber weight is weighed, the fiber group number is recorded, and a resin retention sample is prepared.
The process method for winding and forming the engine shell by the large-size fiber with the chemical has the beneficial effects that:
1. the process method for winding and forming the engine shell by the large-size fiber tape chemicals can overcome the process difficulty in manufacturing the steel shell, has the characteristics of high strength and light weight, can avoid cracking of the chemical columns due to solidification and shrinkage of the propellant in an adherence and chemical pouring scheme, and avoids the damage of the shell due to expansion of a combustion surface when the shell works because the heat insulation layer is debonded from a bonding surface of the chemical columns.
2. The process method for winding and forming the engine shell by the large-size fibers with the chemicals enables the product to be easy to inspect and control the quality, can improve the reliability of the product, has a series of advantages of simple and convenient process for forming the engine shell, high structural efficiency of the product and the like, and can meet the requirements of weapon models.
3. The process method for winding and forming the engine shell by the large-size fiber with the chemical initiates the way for winding and forming the engine shell by the large-size fiber with the chemical, and the engine shell is formed by adopting a mode of remote monitoring winding, constant quantitative glue preparation and layer-by-layer fiber impregnation, so that the process method is safer and more reliable.
Detailed Description
The following further details the embodiments of the present invention:
the first embodiment is as follows: the process method for winding and forming the engine shell by the large-size fibers with the chemicals in the embodiment specifically comprises the following steps of:
the method comprises the following steps of firstly, controlling the temperature and humidity of an explosion-proof workshop, arranging a coated grain core mold on a winding machine, placing the winding machine in the explosion-proof workshop, and installing an explosion-proof workshop static removing device and remote explosion-proof monitoring equipment;
step two, preparing low-temperature curing resin of an epoxy resin system, operating a remote control winding device,
thirdly, the fiber passes through a guide roller of a winding machine, the fiber is wound on a core mold of the coating grain by the setting program of the winding machine, the winding angle is 17-25 degrees,
step four, when the number of spiral winding layers reaches 1/3, pausing winding, impregnating a certain amount of low-temperature curing resin on the fiber surface, after the impregnation is finished, using a glue absorption felt to absorb glue on the shell fiber surface, after the surface composite material layer is cured to a certain extent, carrying out surface treatment, and then carrying out secondary winding;
and step five, starting the winding equipment to continue winding, pausing winding when the winding is performed according to a program 2/3, coating the glue, absorbing the glue, performing surface treatment, and repeatedly dipping the fibers layer by layer until the fibers are fully distributed on the surface of the core mold of the coated grain.
In the first step, the temperature of the explosion-proof workshop is controlled to be between 15 and 20 ℃, and the humidity is controlled to be between 40 and 60 percent.
In step three, the fibers used are carbon fibers or glass fibers, and each mass of fibers is weighed before winding.
In the third step, the fiber passes through a rubber roller and a silk nozzle, the tension of each group of fiber is measured by using a tension measuring instrument, and the tension of the single-bundle fiber is controlled to be 10N-15N.
And (4) setting a winding program remotely and monitoring the winding process, wherein the winding rotating speed is gradually increased, and the final rotating speed is less than 1800 DEG/min.
In the fifth step, the fiber winding angle is 17-25 degrees, and the single-bundle fiber winding tension is 10-15N.
The low-temperature curing resin consists of epoxy resin, an epoxy diluent, a curing agent and a heterocyclic accelerator.
In step four, the impregnated fiber is required to be evenly coated with resin from one side of the core mold to the other side.
In the fourth step, the glue is sucked from the core mould layer to the other layer without excessive force.
After the winding is finished, the residual fiber weight is weighed, the fiber group number is recorded, and a resin retention sample is prepared.
The fibers were carbon fibers and high strength glass fibers, and each mass was weighed before winding.
And (5) finishing a group of processes, and enabling an operator to enter the site to perform yarn breakage and site cleaning work.
The core mold for coating the grain is a thermal insulation material coating propellant, and the surface is required not to be allowed to have defects and damage, and the weight of the core mold and the shaft should be weighed and wound.
And after the solidification is finished, weighing the product (the belt winding shaft), and testing the solidification degree of the resin retention sample, wherein the solidification degree of the resin is not less than 85%.
The winding is changed from spiral winding to annular winding, no fiber treatment is needed by an operator, an intermediate transition program is set, and transition from spiral winding to annular winding is carried out by the intermediate transition program.
The invention of the application lies in: and (4) winding and forming the engine shell with the large size with the chemicals. Because the dangerous level of the propellant indicated by the propellant is high, the whole detonation level is reached, namely the whole process needs to be directly wound on the propellant, once the detonation result is unreasonable, the winding needs to be finished in an explosion-proof workshop, and the remote control is needed. And because the chemical is wound, the curing temperature of the chemical column cannot be too high, and the low-temperature curing resin is prepared by adopting a resin formula in the chemical winding process, but the low-temperature curing resin is easy to explode and gather, so that potential safety hazards are caused.
The invention adopts the process of forming the engine shell as follows: the method comprises the following steps of remote monitoring winding, constant quantitative glue preparation at any time and layer-by-layer fiber impregnation, namely, the shell forming engine shell is formed by adopting remote control, the fiber without impregnated resin is used for winding, before, in the winding process and after winding of each layer, the resin is impregnated layer by layer in the shell fiber, a special glue absorption felt is used for completely impregnating the fiber and the resin after impregnation is finished, and then the next layer of winding work is carried out.
The winding shell with the chemical comprises fibers and matrix resin. The fiber is glass fiber or carbon fiber. The matrix resin is a mixture of epoxy resin, epoxy diluent, curing agent and heterocyclic accelerant.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that reasonable combinations of the features described in the above-mentioned embodiments can be also possible, and any modifications, equivalent substitutions, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (10)
1. A process method for winding and forming an engine shell by large-size fibers with chemicals is characterized by comprising the following steps:
the method comprises the following steps of firstly, controlling the temperature and humidity of an explosion-proof workshop, arranging a coated grain core mold on a winding machine, placing the winding machine in the explosion-proof workshop, and installing an explosion-proof workshop static removing device and remote explosion-proof monitoring equipment;
step two, preparing low-temperature curing resin of an epoxy resin system, operating a remote control winding device,
thirdly, the fiber passes through a guide roller of a winding machine, the fiber is wound on a core mold of the coating grain by the setting program of the winding machine, the winding angle is 17-25 degrees,
step four, when the number of spiral winding layers reaches 1/3, pausing winding, impregnating a certain amount of low-temperature curing resin on the fiber surface, after the impregnation is finished, using a glue absorption felt to absorb glue on the fiber surface of the shell, after the surface composite material layer is cured to a certain extent, carrying out surface treatment, and then carrying out secondary winding;
and step five, starting the winding equipment to continue winding, pausing winding when the winding is performed according to a program 2/3, coating the glue, absorbing the glue, performing surface treatment, and repeatedly dipping the fibers layer by layer until the fibers are fully distributed on the surface of the core mold of the coated grain.
2. The process for winding and forming the engine shell by the large-size fiber with the chemical according to claim 1, wherein in the first step, the temperature of an explosion-proof workshop is controlled to be between 15 and 20 ℃, and the humidity is controlled to be between 40 and 60 percent.
3. The process for winding and forming the engine shell by the large-size fiber with the chemical according to claim 1, wherein in the third step, the used fiber is carbon fiber or glass fiber, and the weight of each fiber is weighed before winding.
4. The process method for winding and forming the engine shell by the large-size fiber with the chemical according to claim 1, wherein in the third step, the fiber passes through a rubber roller and a wire nozzle, the tension of each fiber is measured by using a tension measuring instrument, and the tension of a single fiber bundle is controlled to be 10N-15N.
5. The process for winding and forming the engine shell with the large-size fiber and the chemical according to claim 1, wherein the winding procedure is set remotely, the winding process is monitored, the winding speed is gradually increased, and the final speed is less than 1800 degrees/min.
6. The process method for winding and forming the engine shell by the large-size fiber tape with the chemical according to claim 1, wherein in the fifth step, the fiber winding angle is 17-25 degrees, and the winding tension of the single fiber is 10N-15N.
7. The process of winding and forming the engine housing with the large-size fiber and the chemical according to claim 1, wherein the low-temperature curing resin is composed of epoxy resin, epoxy diluent, curing agent and heterocyclic accelerator.
8. The process for winding and forming the engine case with the large-size fiber and the chemical according to claim 1, wherein in the fourth step, the impregnated fiber is required to be evenly coated with the resin from one side of the core mold to the other side.
9. The process for winding and forming the engine shell by the large-size fibers with the chemical according to claim 1, wherein in the fourth step, the adhesive is not excessively absorbed and is treated from the core mold layer to another layer.
10. The process method for winding and forming the engine shell by the large-size fiber with the chemical according to claim 1, wherein after winding is finished, the weight of the residual fiber is weighed, the number of fiber groups is recorded, and a resin retention sample is prepared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110272163.5A CN113147009B (en) | 2021-03-12 | 2021-03-12 | Process method for winding and forming engine shell by large-size fiber with chemical |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110272163.5A CN113147009B (en) | 2021-03-12 | 2021-03-12 | Process method for winding and forming engine shell by large-size fiber with chemical |
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| Publication Number | Publication Date |
|---|---|
| CN113147009A true CN113147009A (en) | 2021-07-23 |
| CN113147009B CN113147009B (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110272163.5A Active CN113147009B (en) | 2021-03-12 | 2021-03-12 | Process method for winding and forming engine shell by large-size fiber with chemical |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114179389A (en) * | 2021-12-01 | 2022-03-15 | 湖北三江航天江北机械工程有限公司 | Method for improving fiber volume content in winding process of composite shell |
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| GB660789A (en) * | 1945-05-28 | 1951-11-14 | Aerojet Engineering Corp | Propellant charge |
| GB1301296A (en) * | 1968-11-16 | 1972-12-29 | ||
| DE2142076A1 (en) * | 1971-08-21 | 1973-03-01 | Friedrich W Odenberg | Spiral wound solid fuel propellant core - for rocket propulsion units |
| EP0181982A1 (en) * | 1983-09-26 | 1986-05-28 | Societe Europeenne De Propulsion (S.E.P.) S.A. | Method for preparing a propellant casing for a rocket engine |
| US5425973A (en) * | 1985-12-27 | 1995-06-20 | Mcdonnell Douglas Corporation | Integral overwrap shield |
| CN105443973A (en) * | 2015-11-09 | 2016-03-30 | 大连理工大学 | Fibrous-composite-wound pressure container with thin-walled metal lining and manufacturing process thereof |
| CN105684800A (en) * | 2016-02-22 | 2016-06-22 | 西安近代化学研究所 | Hail suppression and rain enhancement bullet engine and manufacturing method thereof |
| CN109653900A (en) * | 2018-11-29 | 2019-04-19 | 湖北航天技术研究院总体设计所 | A kind of forming method of dipulse solid engines powder charge combustion chamber |
| CN109723573A (en) * | 2018-12-28 | 2019-05-07 | 湖北航天技术研究院总体设计所 | A kind of dipulse engine and production method with medicine winding integral structure |
| CN110530225A (en) * | 2019-08-30 | 2019-12-03 | 陈波 | A kind of Waste Distillers'Grain ultra-high pressure water fluid jet is safe to destroy simultaneously recycling and reusing method and system |
| CN111120145A (en) * | 2019-12-17 | 2020-05-08 | 上海新力动力设备研究所 | Shell structure of head prefabricated secondary winding composite material |
-
2021
- 2021-03-12 CN CN202110272163.5A patent/CN113147009B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB660789A (en) * | 1945-05-28 | 1951-11-14 | Aerojet Engineering Corp | Propellant charge |
| GB1301296A (en) * | 1968-11-16 | 1972-12-29 | ||
| DE2142076A1 (en) * | 1971-08-21 | 1973-03-01 | Friedrich W Odenberg | Spiral wound solid fuel propellant core - for rocket propulsion units |
| EP0181982A1 (en) * | 1983-09-26 | 1986-05-28 | Societe Europeenne De Propulsion (S.E.P.) S.A. | Method for preparing a propellant casing for a rocket engine |
| US5425973A (en) * | 1985-12-27 | 1995-06-20 | Mcdonnell Douglas Corporation | Integral overwrap shield |
| CN105443973A (en) * | 2015-11-09 | 2016-03-30 | 大连理工大学 | Fibrous-composite-wound pressure container with thin-walled metal lining and manufacturing process thereof |
| CN105684800A (en) * | 2016-02-22 | 2016-06-22 | 西安近代化学研究所 | Hail suppression and rain enhancement bullet engine and manufacturing method thereof |
| CN109653900A (en) * | 2018-11-29 | 2019-04-19 | 湖北航天技术研究院总体设计所 | A kind of forming method of dipulse solid engines powder charge combustion chamber |
| CN109723573A (en) * | 2018-12-28 | 2019-05-07 | 湖北航天技术研究院总体设计所 | A kind of dipulse engine and production method with medicine winding integral structure |
| CN110530225A (en) * | 2019-08-30 | 2019-12-03 | 陈波 | A kind of Waste Distillers'Grain ultra-high pressure water fluid jet is safe to destroy simultaneously recycling and reusing method and system |
| CN111120145A (en) * | 2019-12-17 | 2020-05-08 | 上海新力动力设备研究所 | Shell structure of head prefabricated secondary winding composite material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114179389A (en) * | 2021-12-01 | 2022-03-15 | 湖北三江航天江北机械工程有限公司 | Method for improving fiber volume content in winding process of composite shell |
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| Publication number | Publication date |
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| CN113147009B (en) | 2022-12-30 |
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