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Method for preparing workpiece with complex inner cavity

A technology for parts and inner cavities, which is applied in the field of complex inner cavity parts preparation, can solve the problems that the core material cannot be used repeatedly, the core cannot be demoulded, and it is difficult to prepare the inner cavity, so that the inner cavity structure can be maintained well and the manufacturing process can be achieved. The effect of easy core and fast core removal

Active Publication Date: 2016-10-12
北京鸿鹄雄狮技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the preparation of parts with a complex inner cavity structure has encountered difficult problems, mainly because the complex structure of the core will cause the problem that it cannot be demoulded, so it is difficult to prepare a complex inner cavity such as a long pipeline structure or a tortuous inner cavity. Composite parts for piping structures
An existing technology is the application of water-soluble cores, which can be removed by water-soluble methods after the composite material is formed, but it inevitably brings about slow dissolution, core materials that cannot be used repeatedly, environmental pollution, and dissolution. Deal with many issues affecting the performance of composite parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The implementation process of the technical solution of this embodiment is as follows:

[0023] (1-1) Die-cast the core material into a block, and then process it into a spiral shape by mechanical processing; or directly extrude the core material into a mold with a spiral cavity at high temperature, and obtain a spiral shape after cooling and demoulding core. Then wrap a non-porous film of polytetrafluoroethylene outside the core to seal.

[0024] (1-2) At room temperature, the continuous carbon fiber pre-impregnated with medium-temperature curing epoxy resin is wound on the non-porous film surface of the polytetrafluoroethylene of the above-mentioned core to obtain a composite material prefabricated body, and then put into the mold; The polytetrafluoroethylene non-porous film at the end is sealed on the mold wall, the mold is closed, the temperature is raised to 120°C and the preform is solidified and formed under the specified pressure and time; then the temperature ...

Embodiment 2

[0028] The implementation process of the technical solution of this embodiment is as follows:

[0029] (2-1) Heat up the core material to 280°C and inject it into a zigzag polyimide sealed bag with a prefabricated cavity to obtain a polyimide sealed bag covered with a core material inside. core. Then wrap a non-porous film of polytetrafluoroethylene outside the core to seal.

[0030] (2-2) At room temperature, the unidirectional continuous carbon fiber or glass fiber prepreg pre-impregnated with high-temperature curing epoxy resin or benzoxazine is spread on the surface of the non-porous film of polytetrafluoroethylene of the above-mentioned core, and then placed into the mold, fix and seal the outlet of the polyimide sealing bag at both ends of the core to the connecting air nozzle to ensure the air isolation between the core and the composite material preform, and the air inlet reserved on one side of the composite material preform Vacuumize, heat up to 180°C, and perform ...

Embodiment 3

[0033] The implementation process of the technical solution of this embodiment is as follows:

[0034](3-1) Prepare a high-temperature nylon sealed bag with a prefabricated cavity in a U-shape; raise the temperature of the core material to 260° C., inject it into the cavity of the high-temperature nylon sealed bag, and obtain a high-temperature nylon sealed bag covered with Core; then wrap a non-porous film of polytetrafluoroethylene outside the core to seal;

[0035] (3-2) At room temperature, unidirectional continuous carbon fiber or glass fiber is wound on the surface of the non-porous film of polytetrafluoroethylene of the above-mentioned core, and the composite material prefabricated body is obtained by shaping, and then put into the mold, and the nylon at both ends of the core is The outlet of the sealed bag is fixed and sealed to the air nozzle, and the air isolation between the core and the composite material prefabrication is ensured. At the same time, the reserved ai...

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Abstract

The invention discloses a method for preparing a workpiece with a complex inner cavity. The method for preparing the workpiece with the complex inner cavity is characterized by comprising the steps that a, continuous fibers presoaked with resin are wound on the surface of a mold core wrapped with an isolating membrane under the room temperature, or resin-presoaked continuous fiber materials are laid on the surface of a mold core wrapped with an isolating membrane in a covering mode to obtain a mode core wrapped with a prefabricated body; b, the mold core wrapped with the prefabricated body is placed into a mould, and the mold core and the prefabricated body are mutually separated in a sealed mode by utilization of a sealant and the isolating membrane; c, the prefabricated body is subjected to curing molding under the conduction of curing; and d, after composing material of the mold core is heated to be melt into a liquid state, compressed air is applied to discharge the liquid state mold core in the cavity of the composite workpiece, cooling and demoulding are conducted, residues of the mold core and the isolating membrane are removed from the cavity, and the workpiece with the complex inner cavity is obtained. The method for preparing the workpiece with the complex inner cavity can be used for preparing various continuous-fiber-reinforced composite workpieces with complex inner cavity structures.

Description

technical field [0001] The invention relates to the technical field of preparation of complex inner cavity parts, in particular to a method for preparing complex inner cavity parts. Background technique [0002] Continuous fiber-reinforced resin-based composite parts have high specific strength and specific stiffness, and are more and more widely used in aerospace, oil pipelines, high-pressure vessels, civil sports equipment and other fields. The preparation methods of continuous fiber-reinforced resin-based composite parts mainly include: lay-up molding, winding molding, and the newly developed 3D printing technology. The winding molding method is mainly used for the preparation of pipelines, containers or complex core-containing structural parts, such as oil pipelines, high-pressure gas cylinders, blades of ships or helicopters, civil lightweight hollow equipment such as crutches, clubs, bicycle frames, etc., usually After the fiber is pre-impregnated, it is wound on a co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/30B29C67/00
CPCB29C67/00B29C70/30
Inventor 冯跃飞
Owner 北京鸿鹄雄狮技术开发有限公司
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