JPS5849380B2 - Method for manufacturing composite material of carbon fiber with pores and resin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a composite material of carbon fiber and resin having pores between the laminated layers.

Conventionally, this type of composite material (hereinafter referred to as prepreg) of carbon fiber and resin such as epoxy resin has been used.

) is formed by laminating the materials, and after the materials have been laminated, the composite material is cured by applying pressure and heat, and then drilling is carried out using a drilling tool such as a twist drill or core drill. It was.

However, with this method, the hardness of the composite material is extremely high, causing significant wear and tear on the drilling tool, and the processing time is also extremely high.
Furthermore, it is extremely difficult to drill holes with small diameters and large depths, and there are many drawbacks such as low processing accuracy.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a composite material having pores having a diameter of 0.32 to 120% with good accuracy, for example.

The present invention will be described below based on examples with reference to the drawings.

In FIG. 1, numerals 1, 2, 3, 4 and 5 each indicate a prepreg laminate in which several sheets of prepreg are stacked.

Now, in order to provide a pore at the position 6 in the laminate 3, as shown in FIG. In this case, the composite materials or molded materials facing each other at the same height with the wire rod in between are sandwiched between the hard wire rods 7,
Respective end faces 3a, 3a', 3b, 3b', 3c, 3c'
and 3d and 3d' are butted against the edge surface of the hard wire material and laminated in a single layer to form a blip-preg laminate 3, and then,
Other prepreg laminates 1, 2, 4.5 are stacked one after another (first step).

In this way, a certain type of opposing mold material is arranged at intervals according to each chord length of the pore, and a hole slightly thicker than the pore is formed.

This laminate is then transferred to an autoclave, e.g.
When heated and pressurized at 200' to 6000 C and 3 to 10 atm, the composite hollow-shaped material is cured to obtain a composite material.

At this time, in the hole portion 6, the material is brought into close contact with the wire rod I by heating and pressurizing, so that a pore corresponding to the shape of the wire rod 7 is formed (second step).

Next, as shown in FIG. 3, the composite material 9 is
By pulling out the wire 7 in the direction of the arrow while holding down, a pore with a predetermined diameter can be formed (third step)
.

Next, the present invention will be further explained with reference to specific examples.

In a composite material made by laminating and curing prepregs having a thickness of 0.14% in the order shown in FIG. 1, 0.32% and 0.80
A JLSG3502 standard piano wire having a diameter of 1.20% and coated with a silicone mold release agent on the surface is inserted between the laminated layers as the wire 7, and laminated in the above manner.
Cured by heating and pressurizing for 15 hours in an autoclave adjusted to 50°C and 45 atmospheres, and then curing for 10 to
When the wires were pulled out with a force of 20 kg, a composite material having pores each having a diameter equal to the diameter of the piano wire was obtained.

In addition, JISC4309 stainless steel wire, JISG
3 5 2 1 Good results were also obtained when hard copper wire or the like was used as the wire rod, but the point is that the wire rod only needs to be strong enough not to break during drawing, and its shape It is also possible to have an elliptical cross-section, a prismatic shape, etc.

Furthermore, a Teflon-based mold release agent may be used as the mold release agent applied to the wire, and depending on the prepreg material, drawing can be performed smoothly without applying a mold release agent.

The present invention is based on the above-mentioned structure, and therefore, a hard wire rod is interposed at a desired position during lamination of a composite material made of carbon fiber and resin, which is extremely difficult to perforate after hardening, and the wire rod is inserted from the left and right sides. By stacking the ends of the prepreg material against the edge surfaces of the wire in a sandwiching manner and then applying heat and pressure, it is possible to form extremely precise pores, and the processing process is simple. In some respects, this method is extremely useful as a method for producing composite materials of this type.

In addition, in the case of drilling using a conventional method such as a drill, the arrangement of the reinforcing carbon fibers in the perforated area is disordered, and the content ratio of the fibers is uneven, which causes the load stress to concentrate and weakens the strength. However, this can have the remarkable effect of eliminating this problem.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams showing the steps of the method for manufacturing a composite material having pores according to the present invention, with Figure 1 being a perspective view showing a laminated state, and Figure 2 showing a state in which holes are formed. The sectional view shown in FIG. 3 is a plan view showing a state in which the wire rod is pulled out. 1.2,3,4.5... prepreg laminate, 6
...Hole, 7...Hard wire.

Claims (1)

[Claims] 1. A hard wire having a diameter suitable for the desired pore is interposed between a composite material or shaped material made of carbon fiber and resin, and the end face of the composite material hollow-shaped material is placed on the edge surface of the wire so as to sandwich the wire from the left and right. A first step of butting, arranging and laminating, a second step of heating and pressurizing the laminate to bring the composite material or mold material into close contact with the hard wire, and drawing out the wire to form pores between the laminate. A method for producing a composite material of a carbon fiber and a resin having pores, the method comprising a third step of: