JPH01180773A - Production of fiber reinforced metal composite material - Google Patents

Abstract

PURPOSE:To make good of wettability between fiber aggregate preform and matrix metal and to obtain smooth impregnation of the metal into the preform by giving the molten matrix metal poured in a casting mold the ultrasonic vibrating action and executing high pressure casting. CONSTITUTION:A perforated plate member 12 made of sintered body, etc., having pressure loss is arranged at lower part of the casting metallic mold 11 and the fiber aggregate preform 21 forming fibrous material in the metallic mold 11 is set and successively, the molten matrix metal 22 is poured into the mold 11. Further, at the same time, vacuum suction is started with suitable exhauster 13 through the perforated plate member 12. Successively, a plunger 14 setting a horn 16 for the ultrasonic vibrator 15 is inserted from upper part of the metallic mold 11. Then the ultrasonic output of an ultrasonic generator 17 is transmitted to the horn 16, further to the plunger 14 and while giving the molten matrix metal 22 the exciting pressurized action, the matrix metal 22 is penetrated into the fiber aggregate preform 21 together with the vacuum suction action to the fiber aggregate preform 21.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a fiber-reinforced metal composite material, and more specifically, to an improvement in the method for manufacturing a fiber-reinforced composite metal material using a high-pressure casting method. It is something.

[Conventional technology]

Conventionally, whiskers and short ams (hereinafter simply referred to as fibrous materials) composed of acicular single crystals such as silicon carbide, silicon nitride, alumina, potassium titanate, or graphite have been characterized by specific strength, specific modulus, Because it has excellent physical properties in many aspects such as heat resistance and chemical stability, it is widely used as a composite reinforcing material for light metals, particularly aluminum (AM).

Therefore, the so-called high-pressure casting method (squeeze casting method) has conventionally been used as an effective means for manufacturing fiber-reinforced composite metal materials with high productivity using this type of fibrous material. This high-pressure casting method is known as
As shown in Figures and Figure 3, the prescribed casting mold! A preform 3 of fiber aggregate formed in advance is set therein, and a matrix metal 4 is set therein.
After injecting the molten metal, the fiber aggregate preform 3 is impregnated with the same matrix metal 4 while being pressurized by the plunger 2, solidified, and cast.

[Problem that the invention seeks to solve]

However, when adopting the conventional high pressure casting method described above,
The most important conditions for the casting operation are to improve the wettability between the preform 3, which is an am-like substance, and the matrix metal 4, and to maintain the molten state of the matrix metal 4 in a normal state throughout the entire impregnation process. It is to hold it to.

In other words, when the wettability between the fibrous material preform 3 and the matrix metal 4 is poor, or when the molten metal cools down during the impregnation process and the matrix metal 4 solidifies, the preform structure collapses and its structure collapses. The Ve value may be significantly different from the initial value', or the smooth penetration of metal into the preform structure may be inhibited, resulting in cracks in the composite part.

The disadvantage is that a homogeneous am-reinforced metal composite cannot be obtained.

Therefore, as a measure to prevent the solidification of the matrix metal 4 during such an impregnation process, conventional methods 9 include, for example, as shown in Japanese Patent Application Laid-open No. 142733/1982, a preheated internal solution in the casting mold is used. Methods have been proposed, such as inserting an insert mold and placing a preformed fiber aggregate preform in the insert mold, or preheating the insert mold and the preform at the same time. , it is difficult to say that this is necessarily an appropriate treatment.

On the other hand, in this conventional high-pressure casting method, the second
As is clear from the figure, the molten metal of the matrix metal 4 is infiltrated from the top surface and all the side surfaces of the fiber aggregate preform 3 as shown by the arrows. There is a problem in that the gas components contained inside the reform 3 are trapped in the center of the composite material to be manufactured, causing defects in the preform structure.

This invention was made to solve these conventional problems, and its purpose is to solve m!
l Improve the wettability between the aggregate preform and the matrix metal to ensure smooth impregnation of the metal into the preform, and at the same time eliminate the negative effects on the preform structure due to the trapping of gas components contained inside. , to propose an improved method for producing homogeneous fiber-reinforced metal composites.

[Means for solving problems]

In order to achieve the above object, the method for manufacturing a fiber-reinforced metal composite according to the present invention provides aiIII in a predetermined casting mold.
In a method for manufacturing a fiber-reinforced metal composite material in which an aggregate preform is set and a molten matrix metal is poured into it for high-pressure casting, an ultrasonic vibration effect is applied to the molten matrix metal injected into a casting mold. It is designed to be cast under high pressure. Furthermore, the method for manufacturing a fiber reinforced metal composite according to the present invention includes setting a fiber aggregate preform in a predetermined casting mold, injecting molten matrix metal into the preform, and high-pressure casting the fiber reinforced metal composite. In the manufacturing method, the molten matrix metal injected into the casting mold is subjected to high-pressure casting by applying a vacuum suction action in addition to an ultrasonic vibration action.

[For production]

For the molten matrix metal injected into the casting mold,
In order to perform high-pressure casting by applying an ultrasonic vibration effect, the molten matrix metal is subjected to an excitation effect by ultrasonic vibration in addition to the original pressurizing effect in high-pressure casting, or in combination with the ultrasonic vibration effect. A vacuum suction action is applied to the fiber aggregate preform, improving the wettability between the am aggregate preform and the matrix metal, and promoting the release of gas components contained within the preform. As a result, a homogeneous #a fiber-reinforced metal composite material with fewer defects in the preform structure can be cast.

Hereinafter, one aspect of the method for manufacturing a fiber-reinforced metal composite material according to the present invention will be described in detail with reference to FIG. 1.

According to the present invention, a perforated plate member 12 having a pressure loss such as a sintered body is disposed in the lower part of the casting mold 11, and a fiber aggregate molded with a fibrous material is formed in the manufacturing mold 11. After the reform 21 is set, a molten metal of the matrix metal 22 is poured into the casting mold 11, and at the same time, vacuum suction is started through the perforated plate member 12 using a suitable exhaust device 13.

At this time, it is also effective to use the above-mentioned conventionally known means for preventing solidification of the matrix metal 22, such as the preheated insert mold (not shown).

Next, from the upper part of the casting mold 11, the plunger 14 in which the horn 16 of the ultrasonic oscillator 15 is arranged is inserted, and the ultrasonic output (in this case, the ultrasonic output) of the ultrasonic oscillator 1B is inserted. The frequency is 50 KHz or less, preferably tl, a range of 10 to 30 KHz) is used as the horn 16. In turn, the information is transmitted to the plunger 14, and while the plunger 14 applies a vibration pressurizing action to the molten metal of the matrix metal 22, it simultaneously applies a vacuum suction action to the fiber aggregate preform 21, and causes the matrix metal 22 to become a fiber aggregate. After the matrix metal 22 is sufficiently impregnated into the entire preform structure, the matrix metal 22 is solidified in the same manner as before while maintaining the pressure to form the desired fiber-reinforced metal composite. It is something to be cast.

Therefore, in the present invention, ? ) The ultrasonic output of the ultrasonic oscillator 17 is applied to the molten metal 22 by the horn 16.
The plunger 14
Since the pressurizing action is applied, the wettability between the fiber aggregate preform 21 and the matrix metal 22 is improved, and the release of gas components contained inside the preform 21 is promoted. , together with exhaust bag M
With the vacuum suction by 13, the gas components are more effectively discharged to the outside, and in this way, the desired homogeneous fiber-reinforced metal composite material is obtained.

In the present invention, in order to prevent the heat generated from the horn 16 from being transferred to the ultrasonic oscillator 15, cooling holes, fins, water cooling jackets, etc. are provided at the top of the horn 16. It is preferable to provide a means to prevent cracks from occurring in the horn portion due to high heat.

Example.

Diameter of fibers derived from potassium dititanate fibers or potassium tetratitanate fibers 0.8-1.51L11+
Same length 50~1OOIL11. Same density 3.3g/cm''
The potassium hexatitanate whiskers were thoroughly loosened and dispersed in pure water, and a wet whisker cake was formed by suction filtration, and then dried at a temperature of 100°C to form a whisker cake with a diameter of 80 mm. 60 layers thick, vf value 1
A disk-shaped preform of 8% was prepared, and this preform was refired at a temperature of 1000° C. to obtain a hard sintered preform without springback, that is, a fiber aggregate preform 21 in this case.

In addition, the inner diameter is 35■■, the outer diameter is 140 layers, and the height is 140■■
A casting mold 11 made of tool steel is used, and a perforated plate member 12 made of a sintered body or the like is disposed at the bottom of the casting mold 11.The manufacturing mold 11 is preheated to 250°C or higher, and heated to 800°C in advance. The fiber aggregate preform 21 heated to
Immediately after injecting 3 kg of 061 as the matrix metal 22, the exhaust device 13 of the oil diffusion pump was operated to start evacuation from the lower surface side of the fiber aggregate preform 21 through the perforated plate member 12, and Under the above conditions 2
While applying ultrasonic vibration at 0 KHz, this fiber aggregate preform 21 is heated to 500 kg/kg by the plunger 14.
Pressure is immediately applied from the top at a pressure of 1 cm'', and this pressurized state is maintained until the molten metal of the matrix metal 22 solidifies, and the desired potassium hexatitanate whisker reinforcement A is obtained.
n-composite, i.e., the desired homogeneous fiber-reinforced metal composite could be cast.

Although the height of the fiber-reinforced metal composite thus obtained shrunk to approximately 54 layers, no defects such as cracks or cracks in the preform structure were observed. Ta.

Further, a tensile test piece (test piece) was cut out from this fiber-reinforced metal composite material and its tensile strength was measured, and it was found to be 36 kg/mtrf. The tensile strength of An alloy 6081 before this composite strengthening treatment was simultaneously measured and found to be 18 kg/m.

Comparative Example A fiber-reinforced metal composite material was obtained in the same manner as in the example except that ultrasonic vibration and evacuation were not performed. As a result, the preform was compressed, and the V value of the composite material was 2 to 3 times higher than the VR value of the preform, and the preform structure had one or two cracks. was recognized.

〔Effect of the invention〕

As detailed above, according to the method of the present invention, a fiber aggregate preform is set in a predetermined casting mold, and a molten matrix metal is poured into the preform to produce a fiber-reinforced metal composite material by high-pressure casting. In this method, the molten matrix metal injected into the casting mold is subjected to ultrasonic vibration action to perform high-pressure casting. Since the excitation effect is applied by ultrasonic vibration, the wettability between the fiber aggregate preform and the matrix metal is improved, and the gas components contained inside the preform are effectively released. This facilitates smooth impregnation of the matrix metal into the fiber aggregate preform, and as a result, the preform structure has fewer defects and a homogeneous fiber-reinforced metal composite can be easily cast. Moreover, even better effects can be expected by using vacuum suction in addition to excitation by ultrasonic vibration.Moreover, in terms of means, it is possible to simply use the ultrasonic vibration mechanism and vacuum suction as necessary. Since it only requires a mechanism, it has excellent features such as being relatively easy to implement.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing an overview of high-pressure casting according to an embodiment of the method for manufacturing a fiber-reinforced metal composite material according to the present invention, and FIGS. 2 and 3 are high-pressure casting according to the conventional example. FIG. 11... Casting mold, 12... Perforated plate member for evacuation, 13... Exhaust device, 14... Plunger, 15... Ultrasonic oscillator, 16 ...Horn, 17...Ultrasonic oscillator. 21... Fiber aggregate preform, 22... Matrix metal. Patent Applicant Toho Titanium Co., Ltd. Agent Patent Attorney Takashi Kawasaki Procedural Amendment (Sealed) 7 February 12, 1988 Commissioner of the Patent Office Kunio Ogawa 1 Indication of the Case
8 Patent Application No. 329810 of 1988 2 Name of the invention Method for manufacturing fiber-reinforced metal composites 3 Relationship with the case of the person making the amendment Patent applicant address 13-31 Konan 2-chome, Minato-ku, Tokyo Name Toho Titanium Co., Ltd. Representative: Shun Yashima - 4 Agent: 105 Telephone: (591) 1004 Address: 5th Floor, Toranomon Towa Building, 1-9-2 Toranomon, Minato-ku, Tokyo Name (7000) Patent Attorney Takao Kawasaki 5 Date of Amendment Order Issued by: Target of amendment: ``Column for detailed description of the invention in the specification'' ``Figure 1 of the drawings'' Contents of amendment: ``Potassium titanate'' in lines 6-7 of page 2 of the specification is amended to ``potassium titanate.'' . "Preform structure" on page 5, line 5 is corrected to "composite structure". "Potassium nititanate tara" on page 9, lines 7-11
・・・・・・・・・・・・Dispersion in pure water" is changed to "fiber diameter 0.8-1.51L layer, same length 50-100I
The potassium hexatitanate whiskers derived from the potassium nititanate fibers or potassium tetratitanate fibers of L Maro are thoroughly loosened and dispersed in pure water.'' The "V value" in the 9th line of page 11 is corrected to "rVr value". As shown in the attached sheet in Figure 1 of the drawings, the code is r12J r13Jr
14J r15J r16J r17J and these leader lines are added.

Claims (2)

[Claims] (1) A method for manufacturing a fiber reinforced metal composite material in which a fiber aggregate preform is set in a predetermined casting mold, and a molten matrix metal is injected into the preform for high pressure casting. A method for manufacturing a fiber-reinforced metal composite material, characterized in that high-pressure casting is performed by applying ultrasonic vibration to a molten matrix metal. (2) A method for manufacturing a fiber reinforced metal composite material in which a fiber aggregate preform is set in a predetermined casting mold, and a molten matrix metal is injected into the preform and cast under high pressure. A method for manufacturing a fiber-reinforced metal composite material, characterized in that a molten matrix metal is subjected to high-pressure casting by applying a vacuum suction action in addition to an ultrasonic vibration action.