JPS6237101B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fiber molded article for fiber reinforced composite members.

Conventionally, when manufacturing fiber-reinforced composite members, a high-pressure solidification casting method has been applied. In this method, the molten metal is pressurized with high hydrostatic pressure and is filled and composited into the fiber molded body heated to a predetermined temperature. The filling composite properties of the material are deteriorated. Furthermore, conventionally, when forming a fiber molded article, the fibers are soldered to each other, resulting in a problem of high manufacturing man-hours and high costs.

In view of the above, an object of the present invention is to provide a fiber molded article having good molten metal filling composite properties and capable of reducing manufacturing man-hours and costs. It is characterized by a fiber sheath formed by braiding on the outer circumferential surface of the fiber.

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings. In Fig. 1, the fiber molded body F has a rod shape, and has a core part fa made of a metal fiber bundle such as stainless steel fiber, and a braided part on the outer peripheral surface of the core part fa. It has an outer covering part fb made of fibers of the same material as the core part fa.

2 and 3 show an apparatus for producing a fiber molded body F, in which a supply reel 1 for a fiber bundle f ₁ rotates around the center line XX of its winding core as shown by an arrow a, thereby producing a fiber bundle f _{1 .} It is designed so that it can be pulled upwards. Further, the supply reel 1 can also rotate around the axis Y--Y of the drawn-out fiber bundle _f1 as shown by the arrow b.

Around the pulled out fiber bundle f ₁ , fibers for the outer covering are placed.
Several sets of braiding units U each including a _f2 supply bobbin 2 and a tension roller 3 are provided. From each supply bobbin 2, a large number of fibers f ₂ are pulled out obliquely upward toward the outer peripheral surface of the fiber bundle f ₁ via the tension roller 3, and the tip of each fiber f ₂ is drawn out toward the outer peripheral surface of the fiber bundle f ₁ . Fixed.

During the braiding operation, when the fiber bundle f ₁ is pulled upward at a predetermined speed and rotated in the direction of arrow b, and the supply reel 1 is rotated in the directions of arrows a and b,
The fibers f ₂ pulled out from each supply bobbin 2 are wound around the outer peripheral surface of the fiber bundle f ₂ while obliquely intersecting with each other, and the outer sheath is
fb is formed.

In the above braiding operation, the number of supply bobbins 2 is 32.
, the number of fibers in each supply bobbin 2 is 50, pitch P
When a rod-shaped fiber molded article F with a diameter of 9 mm was obtained by setting the diameter to 20 mm, its bulk density was 3.04 g/cc.

4 and 5 show a high-pressure solidification casting apparatus for a connecting rod for an internal combustion engine, in which a mold M is provided with a sprue 4, a cavity 5, and a sump 14. The cavity 5 has a large end molded part 5a that communicates with the sprue 4 through a gate ₆₁ , and a small end molded part 5b that is located on the opposite side and communicates with the sprue 14 through a gate ₆₂ . It consists of a rod molded part 5c that communicates the parts 5a and 5b.

The fiber body F, which has been cut to a predetermined length and heated to a predetermined temperature, has one end supported in a cantilever by the piston hole forming core ₇₁ of the small end molding section 5b, and is transferred to the rod molding section. 5c.

First, molten metal such as aluminum alloy is supplied from the hopper 8 to the sprue 4 via the molten metal supply pipe 9, and the inside of the molten metal supply pipe 9 is sealed by the seal plunger 10. Next, the plunger 11 is raised to fill the cavity 5 with molten metal, and then the molten metal is heated to a pressure of 600
Primary pressure is applied to approximately Kg/ ^cm2 .

Then, the molten metal is held under the pressure for 1 to 10 seconds, and when the molten metal becomes semi-solidified, the large end forming portion 5
a, Pressure of 1000 to 2500 is applied by local pressure punches 12 ₁ to 12 ₃ of small end molding part 5 b and pool part 14
Locally pressurize each part 5a, 5b, 14 with Kg/cm ² , and at the same time apply pressure of 1000~ by plunger 11.
Secondary pressurization is performed by pressurizing the sprue 4 with 1200 kg/cm ² to fill and compound the molten metal into the fiber molded body F, and completely solidify the molten metal under this pressurized state.

A conrod material is obtained through the above steps, and by performing predetermined machining on this material, the large end 13a and small end 13b shown in FIGS. 6 and 7 are formed.
and a fiber-reinforced rod portion 13c that connects them and is reinforced with fibers.

Figure 8 shows the area near the boundary between the fiber-reinforced portion c and the single aluminum alloy portion m in the cross section of the rod portion 13c.
The optical micrograph at 200 times magnification shows that the molten metal fills the fiber molded body F with good composite properties and that the shape of the fiber molded body F is not deformed.

In addition, ₇₂ in FIGS. 4 and 5 is a core for forming a crank pin hole. In addition, the core part fa and the sheath part fb of the fiber molded body F do not need to be made of the same material, and combinations of different materials such as stainless fiber and carbon fiber, stainless fiber and silicon carbide fiber, stainless fiber and alumina fiber, etc. are also possible. It is.

As described above, the fiber molded article according to the present invention has a two-layer structure consisting of the core part and the outer covering part of the braided structure formed on the outer peripheral surface of the core part, so it has rigidity and shape retention. In addition, when heated before casting, it has excellent heat retention and does not cause a sudden temperature drop, so the filling properties of the molten metal are good, which is useful for obtaining high-quality fiber-reinforced composite members. It is valid.

Moreover, the binding of the fiber bundle is carried out by the jacket part,
Since the binding can be done by a simple mechanical means such as braiding, manufacturing man-hours and costs can be reduced compared to the conventional method of brazing fibers together, and since the fibers are not heated, their strength can be reduced. There is no. Furthermore, since it is possible to change the materials of the core part and the jacket part, it is possible to easily construct a fiber molded body having different physical properties as required.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a perspective view of a fiber molded body manufacturing device, FIG. 3 is a plan view of the device, and FIG. 4 is a longitudinal sectional front view of a high-pressure solidification casting device. 5 is a view taken along the arrows in FIG. 4, FIG. 6 is a plan view of the cooking rod, FIG. 7 is a sectional view taken along the line in FIG. 6, and FIG. 8 is an optical microscope photograph of a cross section of the rod. F...Fiber molded body, fa...core part, fb...sheathing part.

Claims (1)

[Claims] 1. In the production of fiber-reinforced composite members, in a fiber molded body that is filled with molten metal and composited under hydrostatic high pressure, a core portion consisting of a fiber bundle and fibers formed by braiding on the outer peripheral surface of the core wire portion. A fiber molded article for a fiber-reinforced composite member, consisting of an outer covering part.