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A method and mold for preparing parts with complex inner cavity

A technology of parts and inner cavity, which is applied in the field of parts with complex inner cavity, can solve the problems that it is difficult to prepare parts with complex inner cavity of pipeline structure, the core material is difficult to be used repeatedly, and the core cannot be demoulded, etc., so as to save The effect of energy consumption, easy core making, and fast core removal speed

Active Publication Date: 2018-04-20
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, in the preparation of parts with complex inner cavities, there are difficult problems to solve. The main reason is that the core with complex structure will not be able to demould after molding. Cavity Parts
A kind of existing technology is to develop water-soluble cores, such as Chinese patents CN101559472B, CN102786295B, etc. When using water-soluble cores, the cores can be removed by water-soluble methods after the composite material is formed, but the dissolution rate is inevitably slow , core constituent materials are difficult to reuse, serious environmental pollution, dissolution treatment process affects the performance of composite parts, etc.

Method used

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  • A method and mold for preparing parts with complex inner cavity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The implementation process of the technical solution of this embodiment is as follows:

[0039] (1-1) Cast the core constituent material into a block, and then process it into a spiral shape by mechanical processing; or directly inject the core constituent material into a mold with a spiral cavity, and obtain a spiral shape after cooling and demoulding core. Then wrap a layer of polytetrafluoroethylene non-porous film on the outside of the core as an isolation film, and sealant or sealing strip to seal the film interface.

[0040] (1-2) At room temperature, wrap the continuous carbon fiber pre-impregnated with medium-temperature curing epoxy resin on the surface of the polytetrafluoroethylene non-porous film of the above-mentioned core, and then put it into the mold, and wrap the polytetrafluoroethylene non-porous film at both ends of the core. The film is sealed to the mold wall, and the sealant or bead seal ensures that the core and the composite preform are gas-sepa...

Embodiment 2

[0052] The implementation process of the technical solution of this embodiment is as follows:

[0053] (2-1) Raise the temperature of the core constituent material to 130°C, inject it into a zigzag nylon sealed bag with a prefabricated cavity, and obtain a core with a nylon sealed bag on the outside and a fusible core constituent material inside. , and then wrap a layer of polytetrafluoroethylene non-porous film outside the core to seal. The isolation membrane for the above core is composed of a double layer of nylon with high strength and a non-porous polytetrafluoroethylene membrane that is not bonded to the composite material.

[0054] (2-2) At room temperature, unidirectional continuous carbon fiber or glass fiber prepreg pre-impregnated with medium-temperature curing epoxy resin or polyester or benzoxazine is spread on the non-porous film surface of polytetrafluoroethylene of the above-mentioned core , and then put it into the mold, fix and seal the outlets of the nylon ...

Embodiment 3

[0059] The implementation process of the technical solution of this embodiment is as follows:

[0060] (3-1) Prepare a prefabricated cavity shaped as a U-shaped nylon sealed bag, insert one or two strip-shaped heating resistors inside, so that the length of the heating resistor is similar to the length of the U-shaped cavity; The material is heated to 140° C. and injected into the cavity of the nylon sealed bag to obtain a mold core covered with a nylon sealed bag and a fusible core constituent material inside. Then wrap a non-porous film of polytetrafluoroethylene outside the core to seal;

[0061] (3-2) At room temperature, the unidirectional continuous carbon fiber or glass fiber pre-impregnated with high-temperature curing epoxy resin or double horse 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 it into the mold, fix and seal the outlet of the nylon s...

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Abstract

The invention discloses a method and mold for preparing a workpiece with a complex inner cavity. The method comprises the steps that a, at the room temperature, continuous fibers of preimpregnation resin are wound on the surface of a low-melting-point mold core coated with an isolating film, or continuous fiber resin prepregs are laid on the surface of the low-melting-point mold core coated with the isolating film, and the low-melting-point mold core coated with a prefabricated body is obtained; b, the low-melting-point mold core coated with the prefabricated body is put into the mold, the low-melting-point mold core and the prefabricated body are sealed and isolated from each other through sealant and the isolating film; c, after low-melting-point mold core forming materials are molten into liquid through heating, pressurization is conducted to process pressure, and the molten low-melting-point mold core forming materials are injected into the mold core; and d, afterwards, at the solidification temperature, the prefabricated body is formed through solidification, the solidification-formed workpiece is obtained, after solidification, the liquid mold core forming materials and the isolating film in the solidification-formed workpiece are discharged or cleared away, and the workpiece with the complex inner cavity is obtained. Through the method and mold, the composite workpiece with the complex cavity can be prepared.

Description

technical field [0001] The invention relates to the technical field of parts with complex inner cavities, in particular to a method and mold for preparing parts with complex inner cavities. 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 and molding 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 pipes, containers or complex core-containing structural parts, such as oil pipelines, high-pressure gas cylinders, blades of ships or helicopters, and civil lightweight hollow equipment such as crutches and bicycle frames. Finally, it is wound on a core or central material ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/34B29C33/52
CPCB29C33/52B29C70/342
Inventor 冯跃飞
Owner 北京鸿鹄雄狮技术开发有限公司
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