JPH0310024Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a composite molding device used when manufacturing fiber-reinforced composite materials by an infiltration method.

[Conventional technology]

A method for manufacturing fiber-reinforced composite materials using inorganic or ceramic fibers, whiskers, etc. as reinforcing materials, in which a matrix material such as molten metal or liquid plastic is infiltrated into a pre-shaped aggregate preform of reinforcing materials under vacuum or pressure. There is a way to solidify it. This method is called the infiltration method, and the composite operation is as shown in Figure 2.
A reinforcing material preform 2 is set inside the reinforcing material preform 2, a liquid matrix 3 is injected into the reinforcing material preform 2, and then an upper punch 4 is inserted.
This is done by impregnating the matrix material 3 into the skeletal structure of the reinforcing material preform 2 and solidifying it while applying pressure through the reinforcing material preform 2.

[Problems to be solved by the invention] When creating the above composite, it is important to ensure smooth penetration of the matrix not only from the top surface of the preform but also from the circumferential side, and to provide uniform heat distribution throughout the preform. requirements for operation. For this reason, it is necessary to arrange the preform 2 at the center of the mold 1 with equal clearance between it and the inner wall of the mold, so-called centerset. However, conventional centerset is performed by simply placing the preform 2 in the center of the bottom plate 5, and when the matrix 3 is injected into the mold, liquid flow, rocking, or buoyancy of the preform occurs. The phenomenon that the preform 2 moves upwardly or laterally as shown by the arrow in FIG. 2 frequently occurs due to such actions. If this type of positional variation causes the side surfaces of the preform to partially approach or come into contact with the inner wall of the mold, cooling of this area will be locally accelerated, resulting in matrix solidification, poor impregnation, and composite defects. Various phenomena occur that lead to complex defects, such as shape deformation due to homogeneity and generation of strain inside the tissue.

On the other hand, molding equipment is usually provided with pore passages to exclude air present in the preform from the system, but these pores often become clogged, inhibiting normal compounding. There is a point.

[Means for solving problems]

This invention provides a composite molding device for matrix infiltration with an improved structure in order to solve the above-mentioned problems. The point is that a carbon substrate or a porous ceramic plate 7 provided with a groove 6 for center setting is fixedly installed.

[Effect]

When compounding, the reinforcing material preform 2 is centered so that its bottom part fits into the groove of the carbonaceous plate 7, and this fixing action prevents the positional fluctuation as shown in FIG. 2. Furthermore, the microporous structure of the carbonaceous plate or porous ceramic plate 7 effectively functions to absorb residual air compressed from the preform.

〔Example〕

This invention will be explained below based on illustrated embodiments.

In FIG. 1, 1 is a mold, 4 is an upper punch for pressurizing, and 5 is a bottom plate. The bottom plate 5 may also be used as an opposing punch from below.

Reference numeral 7 denotes a carbonaceous plate made of carbon or graphite material, or a porous ceramic plate made of silicon carbide, alumina, or the like. This carbonaceous plate 7 is fixed to the bottom plate 5 with adhesive or the like,
A groove 6 for center-setting the reinforcing material preform 2 is provided in the center of the upper surface. The shape and dimensions of the groove are formed by cutting to match the shape of the reinforcing material preform to be set, and the depth thereof is 5 mm or less, preferably about 3 mm.

When compounding, the reinforcing material preform 2 is set by being fitted into the groove of the carbonaceous plate or the porous ceramic plate 7. In this state, there is also an anchoring effect between the fibrous surface of the reinforcing material preform 2 and the porous structure surface of the carbonaceous plate or porous ceramic plate 7, so that the reinforcing material preform 2 is stably fixed. Therefore, when the matrix material 3 is injected, the positional fluctuation as shown in FIG. 2 does not occur.

However, if the concave grooves 6 of the carbonaceous plate or porous ceramic plate 7 are slightly larger than the outer shape of the reinforcing material preform 2 to be set, the reinforcing material preform 2 will be stable against lateral displacement, but will not move upward due to buoyancy. resistance is weak. For this reason, when using a metal matrix with a high specific gravity, the tendency to float increases. Position fluctuations can be easily prevented.

Furthermore, the residual air forced out from inside the preform skeleton due to the intrusion of the matrix material 3 is quickly injected into the porous structure of the carbonaceous plate or porous ceramic plate 7 that comes into contact with the interface. Therefore, even if there is no pore passage for air removal or the passage is blocked, the occurrence of complex defects due to intervening air can be effectively prevented.

[Effect of idea]

As described above, according to the composite molding apparatus of this invention, the reinforcing material preform is centered in a stable state throughout the composite process, so that composite defects due to positional fluctuations of the preform do not occur. Moreover, the air in the preform is completely removed due to the air occlusion effect of the carbonaceous plate or the porous ceramic plate, so that a fiber-reinforced composite material of high quality can always be formed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of this invention.
FIG. 2 is an explanatory longitudinal cross-sectional view showing a conventional device. 1... Mold, 2... Reinforcement preform, 3...
...Matrix material, 4...Top punch, 5...
Bottom plate, 6... groove for center setting, 7... carbonaceous plate or porous ceramic plate, 8... carbonaceous rod-shaped body.

Claims (1)

[Claims for Utility Model Registration] 1. A composite molding device having a structure in which a carbonaceous plate or a porous ceramic plate having a groove for center-setting a reinforcing material preform is fixedly installed on the bottom plate of a mold. 2. The composite molding device according to claim 1, wherein a carbonaceous rod is placed on the upper surface of a reinforcing material preform.