Pressure holding device for producing composite parts by infusion of resin and related methods
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A technology of holding device and pressurizing device, applied in the field of aeronautics, can solve the problem that the holding pressure can no longer be ensured to be transmitted to the mold, and achieve the effect of reducing the occupation time and increasing the productivity
Active Publication Date: 2016-08-24
SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
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This solidification in the pipe makes it no longer possible to ensure that the pressure is maintained to be transmitted to the mold, which leads to the appearance of air holes in the part
Method used
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[0052] In all figures, unless otherwise stated, the same elements are provided with the same reference numerals.
[0053] figure 1 A schematic diagram showing a first embodiment of an RTM injection system 100 incorporating a pressure maintaining device 10 according to the present invention.
[0054] The system 100 includes conventional elements so that parts made of composite materials can be manufactured by RTM injection. To this end, the system 100 includes:
[0055] - resin injector 60;
[0056] - an injection mold 20 having two parts, an upper part 21 and a lower part 22, separated by a connecting surface 24 and comprising a cavity 23 having the shape of the part to be produced, into which a braided preform is inserted pieces 25;
[0057] - resin pool 50;
[0058] - an injection pipe 61 connecting the injector 60 to the injection mold 20;
[0059] - a resin outlet pipe 62 connecting the injection mold 20 to the resin pool 50;
[0060] - means 31 for generating a vac...
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Abstract
The invention relates to a pressure maintaining device (10) for a resin injection system (100), characterized in that it comprises: a first chamber (17, 117, 217) connectable to a pressurizing device, and Can be connected with vacuum device; second chamber (18, 118, 218), which can be injected with resin of said injection system (100, 200) through resin injection pipe (61) and resin outlet pipe (62) The network is connected, and the first chamber (17, 117, 217) and the second chamber (18, 118, 218) are arranged so that they cannot leak into each other; the flexible body (19, 219), the flexible body can The pressurization of the first chamber (17, 117, 217) is transferred to the second chamber (18, 118, 218) to apply pressure to the infusion network of the infusion system; a perforated rigid plate (14 , 214) capable of limiting deformation of said flexible body (19, 219) when said vacuum is generated in said first chamber (17, 117, 217).
Description
technical field [0001] The invention relates to a pressure holding device for manufacturing composite parts made by RTM (resin transfer molding) injection molding, and a method for manufacturing parts made of composite materials by RTM injection molding. [0002] The invention finds particular application in the field of aeronautics. Background technique [0003] The RTM method is a known method for manufacturing parts made of composite material (fibre-resin) with a high strength-to-mass ratio. In the traditional way, the RTM method includes the following basic operations: [0004] - preparation of a fiber preform by weaving; [0005] - placing the preform in an injection mold; [0006] - injected liquid resin; [0007] - Applying a pressure holding device on the injected resin and polymerizing the part by heating. [0008] The resin used is very fluid to penetrate well between the different fibers of the preform even when they are injected under reduced pressure. Duri...
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Application Information
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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/48
CPCB29C70/48B29C70/461B29C45/18
Inventor 理查德·马顿安东尼·飞利浦奥
Owner SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
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