Method for preparing washable core mold used for preparing hollow workpiece by using RTM molding technology

A core mold, hollow technology, applied in the field of composite RTM molding and preparation, to achieve the effects of convenient use, high fiber volume content, and improved efficiency

Inactive Publication Date: 2019-09-17
TIANJIN GONGDA AEROTECH COMPOSITE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims at the deficiencies of the prior art methods, and aims to propose a flushable mandrel for the preparation of hollow parts by RTM molding technology, so as to solve the process technology of preparing hollow parts with complex structures by RTM in the prior art. question

Method used

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  • Method for preparing washable core mold used for preparing hollow workpiece by using RTM molding technology
  • Method for preparing washable core mold used for preparing hollow workpiece by using RTM molding technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Prepare sodium bicarbonate, polyethylene glycol, and polyvinylpyrrolidone aqueous solution: respectively weigh 5 grams of sodium bicarbonate, 12 grams of polyethylene glycol, and 5 grams of polyvinylpyrrolidone into 100 ml of water in sequence, and stir to dissolve;

[0041] 2) Wash the quartz sand three times with water, place it in an oven at 80°C, and dry it;

[0042] 3) Take 1,000 grams of the solution in 1) and 1,000 grams of dried quartz sand in 2), stir well and moisten evenly, and set aside;

[0043] 4) Add the uniformly mixed quartz mortar in 3 to the mandrel mold several times, and compact it repeatedly each time;

[0044] 5) Add the assembled mandrel mold into the oven, set the temperature at 160°C for 4 hours, and the mandrel is formed;

[0045] 6) After the mandrel is cooled, take out the mandrel, polish both ends, and cover with a high-temperature-resistant polytetrafluoroethylene sealing film with glue;

[0046] 7) Spread the fabric on the surface of...

Embodiment 2

[0049] 1) Preparation of aqueous solutions of polyethylene glycol and polyvinylpyrrolidone: Weigh 18 grams of polyethylene glycol and 6 grams of polyvinylpyrrolidone respectively, add them to 120 ml of water in turn, and stir to dissolve;

[0050] 2) Wash the quartz sand three times with water, place it in an oven at 80°C, and dry it;

[0051] 3) Take 1,000 grams of the solution in 1) and 1,000 grams of dried quartz sand in 2), stir well and moisten evenly, and set aside;

[0052] 4) Add the uniformly mixed quartz mortar in 3 to the mandrel mold several times, and compact it repeatedly each time;

[0053] 5) Add the assembled mandrel mold into the oven, set the temperature at 170°C for 5 hours, and the mandrel is formed;

[0054] 6) After the mandrel is cooled, take out the mandrel, polish both ends, and cover with a high-temperature-resistant polytetrafluoroethylene sealing film with glue;

[0055] 7) Spread the fabric on the surface of the mandrel in 6), and then install t...

Embodiment 3

[0058] 1) Preparation of polyethylene glycol and polyvinylpyrrolidone aqueous solutions: respectively weigh 20 grams of polyethylene glycol and 10 grams of polyvinylpyrrolidone into 200 ml of water in turn, stir to dissolve;

[0059] 2) Wash the quartz sand three times with water, place it in an oven at 80°C, and dry it;

[0060] 3) Take 1,000 grams of the solution in 1) and 1,000 grams of dried quartz sand in 2), stir well and moisten evenly, and set aside;

[0061] 4) Add the uniformly mixed quartz mortar in 3 to the mandrel mold several times, and compact it repeatedly each time;

[0062] 5) Add the assembled mandrel mold into the oven, set the temperature at 160°C for 4 hours, and the mandrel is formed;

[0063] 6) After the mandrel is cooled, take out the mandrel, polish both ends, and cover with a high-temperature-resistant polytetrafluoroethylene sealing film with glue;

[0064] 7) Spread the fabric on the surface of the mandrel in 6), and then install the mold, injec...

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Abstract

The invention provides a method for preparing a washable core mold used for preparing a hollow workpiece by using an RTM molding technology. The method comprises the following steps that the core mold can be washed and removed by tap water after RTM curing, and comprises a soluble core mold and a tape adhesive sealing film, the soluble core mold can be partially softened and dissolved after being washed with the tap water and can be flushed out of the workpiece along with water flow, the tape adhesive sealing film can resist high temperature of 200 DEG C, sealing is ensured, so that the phenomenon that in an RTM resin injection process, resin is immersed inside the core mold so as to cause the core mold to be cured, and the core mold washing after forming of the workpiece is influenced is prevented. The washable core mold used for preparing the hollow workpiece by using the RTM molding technology can be used for preparing the hollow RTM workpiece, so that the weight of the workpiece is reduced, the strength of the workpiece is improved, the manufacturing process is simple, and mounting and implementation are convenient.

Description

technical field [0001] The patent of the invention belongs to the field of RTM molding preparation of composite materials, and in particular relates to a preparation method of hollow composite material parts. Background technique [0002] Under the current situation that composite materials are widely used in various fields, resin-based composite materials have attracted extensive attention because of their unique properties. Compared with solid parts, hollow parts can reduce weight and cost, especially in the field of aerospace, where the weight of parts is also a decisive factor affecting its use. Therefore, in the RTM molding process of monolithic materials, it is urgent to develop a new removable mandrel to meet the high-strength and light-weight requirements of resin-based composite materials. Water-soluble polymers are hydrophilic and can dissolve or swell when exposed to water. Using this characteristic of water-soluble polymers as an adhesive and mixing with granula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C33/38B29C70/48
CPCB29C33/3842B29C70/48
Inventor 王静陈利李熠杰
Owner TIANJIN GONGDA AEROTECH COMPOSITE MATERIALS
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