KR930007315B1 - Process for making the metal materials strengthened fiber & its articles - Google Patents

Abstract

Method for manufacturing fiber reinforced metal comprises mixing 5-6 g water and 0.05-0.1 wt.% silicon binder to 1 g fiber; putting the water-mixed fiber in the metal mold, then agitating, draining from metal mold till fiber comes out; producing a fiber compact by pressing, dehydrating and drying process; pouring Al alloy melt into the preheated metal mold in which the heated fiber compact is put and pressing with 10-15 mm/sec rate the metal mold to impregnate Al alloy melt into fiber compact.

Description

Manufacturing method of fiber reinforced metal material and fiber reinforced metal material

1 is a schematic view of a preform molding apparatus of the present invention.

2 is a schematic view of a molten metal impregnation apparatus of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced metal, and in particular, to have even strength, wear resistance, and impact resistance regardless of orientation.

It is well known to inject aluminum alloy molten metal into a fibrous molded product of continuous fibers or short fibers to produce a fiber-reinforced metal material that is lighter than iron and superior to iron in tensile strength, abrasion resistance, impact resistance, and the like.

However, the conventional method of manufacturing a fiber-reinforced metal material is obtained by simply superimposing continuous fibers or short fibers in the same direction as in Japanese Patent Laid-Open Publication No. 2-30726 to obtain a fiber molded body and injecting an aluminum alloy molten metal into the fiber molded body. As a result, the tensile strength, impact resistance, and abrasion resistance of the finished material were much different from those toward and away from the fiber.

In addition, in the conventional manufacturing method, the fibrous molded body is simply formed by overlapping continuous fibers or short fibers so that the fibrous molded body cannot be traded as an independent product having a desired shape and density, and it is difficult to separate the division between companies and departments within the same company, and thus is efficient. It was also difficult to establish a production system or production strategy.

In order to solve this problem, the present invention is to make the uniform distribution of amorphous fibers evenly within the fiber molding and to make the fibrous body an independent article having a desired shape and density.

In more detail, the present invention is to put the short fibers in the water mixed with a few binders and sufficiently stirred to make the short fibers evenly distributed in an amorphous state, while maintaining the even distribution, sediment drainage and press molding after dehydration drying the fibers The manufacture of molded articles allows the finished material to have even strength, impact resistance, abrasion resistance, etc., regardless of orientation, and the fibrous molded bodies can be traded as independent articles having desired shapes and densities.

Hereinafter, the present invention will be described in detail by process.

(1st process: mixing process of short fiber and water)

The short fibers made of alumina (Al ₂ O ₃ ) and silicon (SIO ₂ ) are mixed with a small amount of water in which a binder (Silicon binder) is added, but stirred sufficiently so that the short fibers are evenly distributed.

The types of short fibers used in the present invention are generally as follows.

When the short fibers are mixed with water, the mixing ratio of the short fibers, water and the binder (Silicon binder) is as follows.

Short Fiber (g): Water (g): Binder (%) = 1: 5.0-6.0: 0.05-0.1

In addition, the mass of the short fibers to calculate the volume of the fiber molded product to be produced to achieve the desired volume content is by the following equation.

Wf = Vp × Vf × Pf

Wf: weight of short fiber (g)

Vp: Volume of the fiber molded product (cm 3)

Vf: Volume content of fiber (%)

Pf: fiber density (g / cm 3)

For example, if the volume (Vp) of the fibrous molded body is 100 cm 3, the content of short fibers for the Vp, that is, Vf is 23%, and the density Pf of the used short fibers themselves is 3.4 (g / cm 3) The formula gives 100 × 0.23 × 3.4 = 78.2g.

(2nd process: dehydration and pressurization process)

Dewatering and pressurization processes are by means of mechanical devices.

1 is an improved configuration diagram of a device for dewatering and pressurizing. A piston cell (2) for measuring the pressure of the piston (2) is installed above the piston (2) which is lifted and lifted by the hydraulic cylinder (1). The upper mold 4 is attached to the lower end.

On the support plate 6 of the support frame 5, the catching piece 8 of the vacuum box 7 is placed, and the drainage hole 10 corresponding to the drainage hole 9 of the vacuum box 7 is drilled thereon. The plate 11 is mounted and the lower mold 12 and the lower mold support plate 13 are fixed thereon, and the filter paper 14 is inserted on the drain hole 10.

Drain openings 15 and 15 'are drilled at both sides of the vacuum box 8, and the drain openings 15 and 15' are connected to the drain box 17 by hoses 16 and 16 'and the drain box 17 The vacuum pump 18 is connected to the operation of the vacuum pump 18 to form an appropriate vacuum pressure in the vacuum box (8).

The short fiber mixed with water is injected into the lower mold 12 by the first process, and the upper and lower molds 4 and 12 are replaced with a desired shape as necessary.

When the injection is completed, the mixture is slightly stirred again to recover the even distribution of the state shaken during the injection process, and when the even distribution is restored, it is left as it is to settle sufficiently.

During sedimentation, natural drainage is performed through the filter paper 14, and when the sedimentation proceeds more than 90%, the vacuum pump 18 is operated to be forced drainage by vacuum pressure.

However, the rapid drainage caused by excessive vacuum pressure may cause the uniform distribution of the short fibers to be shaken, so that the drainage can be drained as slowly as possible to maintain the even distribution.

Therefore, the suction pressure of vacuum pressure acting at the time of drainage is most appropriate 0.8-1.2 cmHg / ㎠.

However, this draft pressure may vary depending on the mechanical construction and performance of the dehydrator used.

When the drainage proceeds to expose the surface of the precipitated short fibers to operate the hydraulic cylinder (1) to press the upper mold (4).

The pressing action is not intended for drainage, but to determine the size and density of the fibrous body to be manufactured.

The size and density of the fibrous molded body are determined differently depending on the properties such as hardness and tensile property of the fiber reinforced metal material.

If the pressure is too high or too high, the pressure is not evenly applied to the fibrous object to be pressurized, so that a layer is formed of a portion where a large amount of pressure is applied and a portion that is not, thereby producing an uneven defective product such as strength or wear resistance.

Therefore, in order to prevent the formation of a layer on the pressurized object, it is preferable to pressurize at a speed of about 1 mm / sec.

When compressed to the desired size and density by proper pressurization, the upper mold (4) is slightly raised and waited until it is completely drained by vacuum pressure.

When the drainage is completed, the mold is demolded, heated to about 100-200 ° C., and dried to complete the preparation of the fibrous molded body having the desired shape and density.

(3rd step: molten metal impregnation process)

In this process, the molten aluminum alloy is poured evenly into the finished fiber molded body, so that the production of the fiber-reinforced metal material is completed.

The chemical composition of the aluminum alloy used in the present invention is the same as Table (1) or Table (2) below.

TABLE 1

TABLE 2

The aluminum alloy molten metal impregnation apparatus used in this process is roughly the same as the configuration of FIG.

That is, the mold 2 is fixed in the support frame 1, and the heating wire 3 heated by electricity is installed in the body of the mold 2, and the hydraulic cylinder 4 is placed on the mold 2. The punch 5 which moves up and down is provided.

Before inserting the fibrous body 6 into the mold 2, the fibrous body 6 and the mold 2 are properly heated so that the aluminum alloy molten metal can sufficiently infiltrate into the numerous pores formed in the fibrous body 6 evenly.

The fibrous molded body 6 is most suitably heated to about 700 占 폚 and the temperature of the mold 2 to about 400 占 폚.

This is the most ideal temperature considering the temperature of the aluminum alloy molten metal (7) is approximately 700-800 ℃ and the cooling temperature after the injection of the molten metal is approximately 300-350 ℃.

The heating of the mold 2 is performed by the electric heating wire 3 installed in the body of the mold 2, and the heating of the fibrous molded body is performed by a separate electric heating furnace, but may be heated by other methods.

Put the heated fibrous body 6 into a suitably heated mold 2 as above, and pour aluminum alloy molten metal 7 of the same component as in Table 1 or Table 2 thereon and punch it thereon. 5), the aluminum alloy molten metal is evenly infiltrated into the numerous pores formed in the fibrous molded body (6).

What is important at this time is the pressurization condition of the punch 5.

In other words, if the pressurization speed and time are excessive, the product is deformed with the fibrous body, and if it is insufficient, impregnation may not be sufficient, resulting in defective products.

Also important in this process is the volume ratio of the molten aluminum alloy to the fibrous molded body.

If the ratio of fiber-formed metal in the fiber-reinforced metal material is too high, the fibers may stick together in the pressing process and it is difficult to sufficiently impregnate the aluminum alloy molten metal between the fibers, and if the ratio of the fiber-formed body is too low, the effect of fiber-reinforcement will be almost ineffective.

According to the present invention, the time that the punch 5 contacts the surface of the aluminum alloy molten metal 7 at the time of pressurization is most suitably about 2-3 seconds, and the pressurization speed is suitably 10-15 mm / sec.

In general, the volume ratio of the fiber molded product in the fiber-reinforced metal material is 9-23%.

In other words, the volume ratio of the aluminum alloy molten metal 77-91%: the fiber molded body 9-23% is good.

If the volume ratio of the fibrous molded body is 23% or more, as described above, there is no sufficient impregnation of the molten metal between the fibers, and if it is 9% or less, there is almost no fiber strengthening effect.

After the punch 5 is fully pressurized, the state is maintained for about 10 seconds to complete the pressurization.

When the pressurization is completed, by cooling to about 300-350 ° C and demolding, the production of the fiber reinforced metal material (FRM) of the present invention is completed.

The present invention produced as described above is uniformly distributed in a single fiber in the FRM has a uniform tensile strength, impact resistance, abrasion resistance, etc., regardless of the direction, and the fiber molded body is manufactured as an independent article of the desired shape and density between companies As it can be traded, moved and stored, it is possible to make division of labor between companies or departments within the company, and thus it is possible to establish efficient production system and production strategy.

Claims (6)

The short fibers are mixed with a small amount of binder water and stirred to be evenly distributed. The short fibers mixed with water are added to a mold, and then precipitated and drained while maintaining an even distribution of the short fibers. The method of manufacturing a fiber-reinforced metal material prepared by heating the fibrous molded product, inserting it into a preheated mold, pouring aluminum alloy molten metal on it, and pressing it with a punch to sufficiently impregnate the aluminum alloy town in the fibrous molded body and then cooling it by demolding. . The short fibers are mixed with a small amount of binder water and stirred to be evenly distributed. The short fibers mixed with water are added to a mold, and then precipitated and drained while maintaining an even distribution of the short fibers. A fiber-reinforced metal material prepared by heating a fibrous molded product, putting it in a preheated mold, pouring aluminum alloy molten metal on it, and pressing it with a punch so that the aluminum alloy molten metal is sufficiently impregnated in the fibrous molded body and then cooled by demolding. The method of claim 1, wherein the short fibers are mixed with water in which some binder is added, but the short fibers 1g, 5-6g of water, and 0.05-0.1% of a binder (Silicon binder) are added and mixed with water. Put it in the mold and stir it a little more and settle it. When it is settled about 90%, it is gradually drained by vacuum pressure. When drained to the extent that the surface of short fiber is exposed, it is pressurized by the upper mold at a pressure of about 1mm / sec and demolded. A method for producing a fiber-reinforced metal material, which is dried to produce a fiber molded article. The method of claim 2, wherein the short fibers are mixed with water in which a little binder is added, but the short fibers mixed with water at a rate of 1 g of short fibers, 5-6 g of water, and 0.05-0.1% of a binder (Silicon binder) are mixed with the lower portion. Put it into the mold and stir a little more and settle again.When it is settled about 90%, it is gradually drained by vacuum pressure, and when drained to the extent that the surface of the short fiber is exposed, it is pressurized by the upper mold at a pressure of about 1mm / sec. Fibrous molded product obtained by demolding drying. The method for producing a fiber-reinforced metal material according to claim 1, wherein the fiber-reinforced metal material is produced so that the volume ratio of the fiber molded body is 9-23%. The method for producing a fiber-reinforced metal material according to claim 1, wherein the punch is in contact with the surface of the aluminum alloy molten metal for 2-3 seconds and the pressing speed is 10-15 mm / sec.