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RTM molding method and device

A molding method and molding device technology, applied in textiles, papermaking, fiber processing, etc., can solve problems such as poor fluidity, long time, and aggravated resin gelation

Inactive Publication Date: 2009-04-15
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, it is difficult to set the amount of flowing resin to a large extent, and there is only one resin injection port, so there is a problem that RTM molding of large products is difficult
That is, there is a problem that, when the resin is made to flow, the gelation of the resin is accelerated (resin viscosity increases), and the resin cannot flow into the entire area of ​​the molded product.
However, in this method, although the resin flows while sequentially impregnating the reinforcing fiber base material from one side to the opposite side, if the molded product becomes relatively large, there is a problem that it takes an extremely long time for the resin to flow, and it may vary depending on the situation. Changes, the resin reaches the gelation time in the flow and stops flowing before complete impregnation
Therefore, the fluidity of the resin to this gap is poor, and as a result, voids or pinholes are easily generated here
As described above, especially in the RTM forming method or the vacuum forming method, even if a random mat layer is provided on the outermost layer (pattern surface of the surface layer), the generation of voids or pinholes cannot be prevented

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0197] In each of the above-mentioned embodiments, the size of the metal mold on the molding surface (cavity surface) is 1500 mm x 1200 mm x 3 mm in depth, and as the reinforcing fiber base material, 8 layers of torayca T700 fabric BT70-30 manufactured by Toray Co., Ltd. are used. (300g / m 2 ) laminates, as the resin, high-speed curing epoxy resin (main agent: "Epikoto" 828 (epoxy resin manufactured by Yuhua Shell Epoxy Co., Ltd.); curing agent: Toray Co., Ltd. blend (blend) TR- C35H (imidazole derivative)) can be molded well and quickly even for relatively large molded products. It should be noted that when the resin injection pressure is 0.7MPa, the time for the resin to completely impregnate the substrate is 5 minutes or less, which can be shortened to 1 / 5-1 / 10 or 1 / 5-1 / 10 or less.

[0198] 8 to 12 show the RTM molding method and apparatus according to the second embodiment of the present invention. FIG. 11 shows a schematic configuration diagram of an example of a moldi...

Embodiment 2

[0219] In the RTM molding system 54 according to this embodiment shown in FIG. 11 , an example of molding a large flat plate (length 1500 mm x width 700 mm x height (thickness) 3 mm) will be described as an example of molding according to the molding conditions of the present invention. The overall view of the RTM molding metal mold 1 used in this example is shown in Figures 8 and 9, and the relationship between the temperature and viscosity of the resin used in the molding and the resin curing degree-time characteristics at the molding temperature are shown in Figure 12A and Figure 12A. 12B. In the molding cavity 50 provided in the lower mold 43 of the molding mold 41 (the same as the upper mold 42 and the lower mold 43 with a length of 2000 mm, a width of 1000 mm, and a height of 350 mm) including the resin injection pipes 46 to 48 and the discharge pipe 49 , laminated 8 layers (0 / 90° oriented substrate, 4 layers; ±45° oriented substrate, 4 layers) Toray Co., Ltd. carbon fib...

Embodiment 3

[0235] In addition, the above-mentioned Example 2 is a single-plate structure of reinforced fiber resin base material, as another example, even if it is a carbon-reinforced fiber sandwich structure with a core (thickness 10 mm, surface specific gravity 0.1) inside By laminating three layers of the above-mentioned carbon fiber "torayca" fabric on the upper and lower surfaces respectively), molded products with almost the same surface quality can be obtained. Incidentally, the impregnation time is about 4.5 minutes, which is the same short time as above.

[0236] Next, the RTM molding method according to the third embodiment of the present invention will be described. First, production of a reinforcing fiber base material according to this RTM molding method will be described with reference to FIG. 18 . As shown in FIG. 18, a resin injection port 85 and a suction port 86 are provided in an upper die 83 of the two dies. The lower mold 84 includes a resin injection flow path 88 ...

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Abstract

An RTM molding method comprising disposing a reinforcing fiber substrate in a cavity of a mold consisting of a plurality of dies, clamping the mold, and thereafter injecting resin to complete molding, characterized in that divided areas with respect to the surface direction of the reinforcing fiber substrate are assumed, each divided area is one in which injected resin expands over the entire surface in the area and can be substantially uniformly impregnated in the thickness direction of the substrate, and resin introducing paths are formed for respective assumed divided areas for introducingthe injected resin into the respective divided areas; and an RTM molding device. When a relatively large molded product is to be molded, a molding step from resin injection to impregnating / curing canbe implemented at high speed without generating a non-resin-flowing area, thereby enabling a high-quality molded product to be produced free from voids, etc., with a molding time shortened and production speed and volume increased.

Description

[0001] This application is a divisional application of the application dated February 16, 2005, application number 200580005211.3 (international application number PCT / JP2005 / 002314), and invention name "RTM forming method and device". technical field [0002] The present invention relates to the RTM (Resin Transfer Molding (Resin Transfer Molding)) molding method and device for molding relatively large FRP (Fiber Reinforced Resin), especially to the RTM molding method and device capable of high-speed molding and improving surface quality. Background technique [0003] FRP, especially CFRP (Carbon Fiber Reinforced Resin) is used in various fields as a lightweight composite material with high mechanical properties. As one of the FRP molding methods, it is known to place a reinforcing fiber base material composed of a laminated material such as a reinforcing fiber fabric in a mold, and after closing the mold, reduce the pressure in the mold, inject liquid resin, and heat it to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/48B29C70/54B29C33/00B29C39/10D06M17/00
CPCB29C70/48B29C70/547
Inventor 关户俊英岩泽茂郎仙波龙也
Owner TORAY IND INC
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