JP2000343205A - Manufacture of amorphous alloy formed stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of forming even a small and long hole with a specified shape, high dimensional accuracy and surface quality, and manufacturing an amorphous alloy formed stock in a simple process and with excellent mass productivity. SOLUTION: A molten metal A of a material to generate an amorphous alloy in a melting container 1 is poured and cast in a cavity 4 of a die 3 which is maintained at the temperature that the die temperature Tm is not lower than the glass transition temperature Tg of the alloy and lower than the melting point Tm. Then, a small wire-like core member 6 is penetrated in a casting material B in a condition that the die temperature Tm is maintained at the temperature not lower than the glass transition Tg, and drawn to form a small hole 7. After the die is cooled until the die temperature is not higher than the glass transition temperature Tg, the die is separated, and an amorphous alloy formed stock 8 is taken out. The core member may be set in the die in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an amorphous alloy molded article, and more particularly, to a technique for molding an amorphous alloy (metallic glass) using a supercooled liquid state or a glass transition region, and in particular, an optical connector. The present invention relates to a technique for forming a fine hole with high dimensional accuracy useful for forming parts (ferrules, capillaries) and the like.

[0002]

2. Description of the Related Art Conventionally, as a technique for forming a small hole, various methods such as a drilling method, a processing method in which ultrasonic waves are added to drilling, and a laser processing method are known. However, in drilling, the depth of a hole is limited to about 5 times the diameter of a drill, and a thin and long hole cannot be drilled. In the case of a long hole, electrical discharge machining is performed, but there is a limit on the hole diameter. Further, a deep hole cannot be formed by a processing method in which ultrasonic waves are added to drilling. For example, 5mm for hole diameter φ0.1mm
However, there is a drawback that the degree is the limit and high precision is not required. On the other hand, even in laser processing, for example, the hole diameter φ
At most, 3 to 5 mm is required for 0.1 mm, and there is a problem that high precision cannot be achieved even with this processing method.

[0003] A capillary or a ferrule of an optical connector is a typical example having an elongated through hole and requiring high dimensional accuracy. Referring to the accompanying drawings, FIG. 7 shows a ferrule 10 in which an optical connector has a capillary portion 11 and a flange portion 12 which are integrated. That is, the ferrule 10
Is a capillary section 11 in which a small-diameter through hole 13 for inserting an optical fiber 17 (or an optical fiber) is formed along a central axis, and an optical fiber core 16 (of an optical fiber) along the central axis. With outer jacket attached to the outer periphery)
Flange part 12 in which large-diameter through hole 14 for insertion is formed
The small-diameter through-hole 13 and the large-diameter through-hole 14 are connected via a tapered diameter portion 15. The pair of optical fibers 17, 17 is connected by inserting the ferrules 10, 10 into which they are inserted and joined, from both ends of the split sleeve 18, and butting the ends of the ferrules 10, 10 together. The optical fibers 17, 17
The tip ends are butt-connected while the axes of are aligned. On the other hand, FIG. 8 shows an optical connector ferrule 10a in which a capillary 11a of an optical connector and a flange 12a are separate bodies.

[0004] The diameter of the small hole through which the optical fiber passes varies depending on the type. For example, a capillary (ferrule) called an SC type has a small hole of φ0.126 mm and a depth of 10 mm. Primarily, capillaries are made of ceramics such as zirconia. This small hole molding,
A capillary having a small hole is injection molded in advance, and after firing, the hole is formed into a regular size by wire wrapping. In addition, this part is manufactured through many steps such as outer diameter processing and polishing in addition to fine hole processing. Therefore, the manufacturing process is long and the cost is forced to increase.

As a capillary made of another material, there is a capillary made of glass. On the contrary, a glass tube having a large hole (crystallized) in advance is controlled to predetermined outer and inner diameters in a glass transition region. It is stretched and molded. However, such a method has a disadvantage that dimensional control is difficult.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to form a complicated or minute shape, and in particular to form a long and narrow hole with a predetermined shape, high dimensional accuracy and surface quality. Therefore, the present invention provides a method for producing such an amorphous alloy molded product in a simple process with good mass productivity, and is thus inexpensive amorphous alloy molded product having excellent durability, strength, impact resistance, etc. It is intended to provide an alloy molded product.

[0007]

According to the present invention, there is provided, in accordance with the present invention, a method for producing an amorphous alloy molded article, the method comprising: A molding step of extracting a core member present in the amorphous alloy in a temperature region lower than (Tm) to obtain a molded body having a cross-sectional shape of the core member, and a step of cooling the molded body. I have.

A more specific first aspect of the method for producing an amorphous alloy molded article of the present invention is a step of injecting a molten metal of a material capable of forming an amorphous alloy into a cavity of a mold, a glass transition temperature ( A molding step of piercing a core member into an amorphous alloy maintained at a temperature equal to or higher than Tg) and lower than a melting point (Tm), and extracting the core member to form a molded body having a cross-sectional shape of the core member; and cooling the molded body. It is characterized by including the step of performing.

In a second more specific embodiment of the method for producing an amorphous alloy molded article according to the present invention, a core member having a desired cross-sectional shape is set in advance and the glass transition temperature (Tg) of the amorphous alloy or higher is set. Injecting a molten metal of a material capable of forming an amorphous alloy into a cavity of a mold maintained at a temperature lower than the melting point (Tm), and maintaining the temperature at a temperature higher than the glass transition temperature (Tg) and lower than the melting point (Tm) in the cavity. The method is characterized by including a forming step of extracting a core member from the amorphous alloy in the state as described above to form a molded body having a cross-sectional shape of the core member, and cooling the molded body.

[0010] Further, a third embodiment of the method for producing an amorphous alloy molded article according to the present invention relates to a material capable of forming an amorphous alloy in a cavity of a mold in which a core member having a desired sectional shape is set in advance. And cooling the cast material in the cavity to a temperature lower than the glass transition temperature (Tg). The cast material in the cavity was heated to a temperature higher than the glass transition temperature (Tg) and lower than the melting point (Tm). The method is characterized by including a forming step of extracting the core member in the state to form a molded body having the core member with a cross-sectional shape, and a step of cooling the molded body.

Further, a fourth embodiment of the method for producing an amorphous alloy molded article according to the present invention is directed to a material capable of forming an amorphous alloy in a cavity of a mold in which a core member having a desired sectional shape is set in advance. And cooling the casting material in the cavity to a temperature lower than the glass transition temperature (Tg). The core member in the cavity is heated by using its electric resistance, and the casting near the core member is cast. A molding step in which the core member is pulled out in a state where the material is heated to a temperature equal to or higher than the glass transition temperature (Tg) and lower than the melting point (Tm) to form a molded body having a core member having a cross-sectional shape, and cooling the molded body It is characterized by including the step of performing.

In any of the above methods, a fine hole can be formed with high dimensional accuracy by using a thin linear member as a core member. In particular, a ferrule or capillary for an optical connector having a long thin hole can be manufactured. It can be applied to advantage.

Further, according to the present invention, there is provided a more general forming method capable of forming not only a small hole but also various cross-sectional shapes. That is, according to another aspect of the present invention, an amorphous alloy is converted to a continuous cooling transformation (CCT).
Includes a step of raising the temperature to a temperature equal to or higher than the glass transition temperature (Tg) and lower than the melting point (Tm) at a temperature rising rate that does not touch the nose in the curve diagram, forming in this temperature range, and cooling the formed body. There is also provided a method for producing an amorphous alloy molded article characterized by the above. In this method, the above-mentioned molding step may be combined so as to be performed by the molding step of any one of the above-described embodiments.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The method for producing an amorphous alloy molded article according to the present invention uses an optical connector component (ferrule, capillary) utilizing a supercooled liquid state of an amorphous alloy (metallic glass) or viscous flow in a glass transition region. And the like to form small holes and the like. If the molten alloy having the amorphous alloy composition is cooled at an appropriate cooling rate, the molten metal becomes a so-called supercooled liquid state that exists in a liquid state even at a temperature lower than its melting point (has a lower viscosity than a solid substance). Further, in an alloy composition having a large amorphous forming ability, the molten metal is cooled from the melting point or higher, and is kept at a temperature higher than the glass transition temperature (or a temperature at which the material can be handled as a solid substance) for a predetermined time and then cooled. An alloy containing an amorphous phase is obtained. In addition, a stable amorphous alloy called a metallic glass has a glass transition region in which the viscosity is reduced before crystallization when the temperature is raised after the amorphous is once amorphized.
In general, amorphous alloys have very high strength and can hardly be processed at room temperature, but by using these supercooled liquid state and glass transition region, they can be processed with relatively small force due to their low viscosity. Thus, it is possible to produce a molded article containing at least an amorphous phase having high dimensional accuracy, particularly a part having fine holes.

Therefore, the method for manufacturing an amorphous alloy molded article according to the present invention is a method for extracting a core member existing in an amorphous alloy in a temperature range from a glass transition temperature (Tg) to a melting point (Tm). When a thin linear member is used as the core member, a fine hole can be formed with high dimensional accuracy. The core member is pulled out at the glass transition temperature (T
g) A method in which the core member is pierced into the amorphous alloy maintained at a temperature lower than the melting point (Tm) and then pulled out, or a core member having a desired sectional shape is set in advance and the amorphous alloy is Glass transition temperature (T
g) After casting a molten metal of a material capable of forming an amorphous alloy into a cavity of a mold maintained at a temperature not lower than the melting point (Tm), the core member is pulled out of the amorphous alloy maintained at the above temperature. Method or a state in which the casting material in the cavity is once cooled to a temperature lower than the glass transition temperature (Tg), and then the casting material in the cavity is heated again to a temperature higher than the glass transition temperature (Tg) and lower than the melting point (Tm). For example, a method of pulling out a core member can be adopted. In the last-mentioned method, it is not always necessary to heat the entire cast material in the cavity to a temperature equal to or higher than the glass transition temperature (Tg), and it is also possible to heat only a portion requiring molding. For example, the core member in the cavity is heated by utilizing its electrical resistance, and the core member can be pulled out while the amorphous alloy near the core member is heated to a temperature equal to or higher than the glass transition temperature (Tg). .

By performing each of the above steps in a vacuum or in an inert gas atmosphere, it is possible to prevent the formation of an oxide film of the molten alloy and to produce an amorphous alloy molded article of good quality. In order to prevent formation of an oxide film on the molten metal, the entire apparatus is placed in a vacuum or in an inert gas atmosphere such as Ar gas, or an inert gas is flowed at least at a location where the molten alloy is exposed. Is preferred.

As the material used in the method of the present invention, any material capable of obtaining a product made of a substantially amorphous alloy can be used, and is not limited to a specific material. An amorphous alloy having a composition represented by any one of the following general formulas (1) to (6) can be suitably used. Formula _{^{(1): M 1 a M}} 2 b Ln c M 3 d M 4 e M 5 f However, one or two elements M ¹ is selected from Zr and Hf, M ² is Ni, Cu, Fe , Co, Mn, Nb, T
at least one element selected from the group consisting of i, V, Cr, Zn, Al and Ga; Ln is Y, La, Ce, N
at least one element selected from the group consisting of d, Sm, Gd, Tb, Dy, Ho, Yb, and Mm (mish metal which is an aggregate of rare earth elements); M ³ is Be, B,
At least one element selected from the group consisting of C, N and O; M ⁴ is at least one element selected from the group consisting of Ta, W and Mo; M ⁵ is Au, Pt, Pd and A;
at least one element selected from the group consisting of g, a,
b, c, d, e and f are each atomic%, and 25 ≦ a ≦
85, 15 ≦ b ≦ 75, 0 ≦ c ≦ 30, 0 ≦ d ≦ 30,
0 ≦ e ≦ 15 and 0 ≦ f ≦ 15.

The amorphous alloy has the following general formula (1)
-A) to (1-p) amorphous alloys. General formula (1-a): M ¹ _a M ² _b This amorphous alloy has a large negative enthalpy of mixture and good amorphous forming ability because the M ² element coexists with Zr or Hf. Formula ^{(1-b): M 1} a M 2 b Ln c , as in this amorphous alloy, the formula (1-a)
By adding a rare earth element to the alloy of the above, the thermal stability of the amorphous is improved.

[0019] Formula ^{(1-c): M 1} a M 2 b M 3 d general formula ^{(1-d): M 1} a M 2 b Ln c M 3 d like these amorphous alloys, the atomic radius of By filling the gaps in the amorphous structure with small elements (Be, B, C, N, O), the structure is stabilized and the ability to form an amorphous phase is improved.

[0020] formula ^{(1-e): M 1} a M 2 b M 4 e general formula ^{(1-f): M 1} a M 2 b Ln c M 4 e general formula ^{(1-g): M 1} a _{^{M 2 b M 3 d M 4}} e general formula ^{(1-h): M 1} a M 2 b Ln c M 3 d M 4 e like these amorphous alloys, refractory metals (T
When (a, W, Mo) is added, heat resistance and corrosion resistance are improved without affecting the ability to form an amorphous phase.

The general formula ^{(1-i): M 1} a M 2 b M 5 f general formula ^{(1-j): M 1} a M 2 b Ln c M 5 f general formula ^{(1-k): M 1} a _{^{M 2 b M 3 d M 5}} f general formula ^{(1-l): M 1} a M 2 b Ln c M 3 d M 5 f general formula ^{(1-m): M 1} a M 2 b M 4 e M 5 _f general formula ^{(1-n): M 1} a M 2 b Ln c M 4 e M 5 f general formula ^{(1-o): M 1} a M 2 b M 3 d M 4 e M 5 f general formula (1 -p): for _{^{M 1 a M 2 b Ln c}} M 3 d M 4 e M 5 f these noble metals ^{M 5 (Au, Pt, Pd} , Ag) laden amorphous alloys, even crystallization occurred fragile No.

The general formula _{(2): Al 100-ghi} Ln g M 6 h M 3 i However, Ln is Y, La, Ce, Nd, Sm, Gd, T
at least one element selected from the group consisting of b, Dy, Ho, Yb, and Mm; M ⁶ is Ti, V, Cr, Mn,
Fe, Co, Ni, Cu, Zr, Nb, Mo, Hf, T
at least one element selected from the group consisting of a and W, M ³ is at least one element selected from the group consisting of Be, B, C, N, and O; g, h, and i are each atomic%; 30 ≦ g ≦ 90, 0 <h ≦ 55, 0 ≦ i ≦ 10
It is.

The above amorphous alloy has the following general formula (2)
-A) and (2-b) amorphous alloys. Formula _{(2-a): Al 100} -gh Ln g M 6 h This amorphous alloy, mixing enthalpy is large in negative, amorphous forming ability is good. Formula (2-b): In the ^{_{Al 100-ghi Ln g M 6}} h M 3 i This amorphous alloy fills atomic radius smaller elements (Be, B, C, N , O) a gap amorphous structure in This stabilizes the structure and improves the ability to form an amorphous phase.

General formula (3): Mg _100-p M ⁷ _p where M ⁷ is at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and p is atomic% and 5 ≦ p ≦
60. This amorphous alloy has a large negative enthalpy of mixing and good amorphous forming ability.

General formula (4): Mg _100-qr M ⁷ _q M ⁸ _r where M ⁷ is at least one element selected from the group consisting of Cu, Ni, Sn and Zn, and M ⁸ is Al, Si and At least one element selected from the group consisting of Ca, q
And r are each atomic%, 1 ≦ q ≦ 35, 1 ≦ r ≦ 2
5 Like this amorphous alloy, an element having a small atomic radius (Al, S
By filling gaps in the amorphous structure with (i, Ca), the structure is stabilized, and the ability to form an amorphous phase is improved.

General formula (5): Mg _100-qs M ⁷ _q M ⁹ _s General formula (6): Mg _100-qrs M ⁷ _q M ⁸ _r M ⁹ _s where M ⁷ is Cu, Ni, Sn and Zn At least one element selected from the group consisting of M, M ⁸ is at least one element selected from the group consisting of Al, Si, and Ca;
⁹ is at least one element selected from the group consisting of Y, La, Ce, Nd, Sm and Mm, q, r and s are each atomic%, and 1 ≦ q ≦ 35, 1 ≦ r ≦ 25, 3 ≦ s ≦
25. Like these amorphous alloys, the thermal stability of the amorphous is improved by adding a rare earth element to the alloys of the general formulas (3) and (4).

Among the above-mentioned amorphous alloys, Zr-TM-Al-based and Hf-TM-Al-based (TM: transition metal) amorphous alloys having an extremely wide temperature difference between the glass transition temperature (Tg) and the crystallization temperature (Tx) Is a super-cooled liquid region (glass transition region) with high strength and high corrosion resistance
ΔTx = Tx−Tg is 30K or more, especially Zr-TM-A
The 1-type amorphous alloy is extremely wide at 60K or more, and exhibits very good workability even in a low stress of several tens MPa or less due to viscous flow in this temperature range. In addition, the cooling rate is
It is very stable and easy to manufacture, for example, an amorphous bulk material can be obtained even by a casting method of about 0 K / s.
These alloys produce an amorphous material and at the same time reproduce the mold shape and dimensions very faithfully, either by die casting from the melt or by viscous flow forming utilizing the glass transition region.

These Zr-TM- used in the present invention
Although the Al-based and Hf-TM-Al-based amorphous alloys vary depending on the alloy composition and the measuring method, a very large ΔT
x range. For example, Zr ₆₀ Al ₁₅ Co _2.5 N
i _7.5 Cu ₁₅ alloy (Tg: 652K, Tx: 768K)
Is very wide at 116K. It has very good oxidation resistance, and is hardly oxidized even when heated to a high temperature up to Tg in air. The hardness is 460 (DPN) in Vickers hardness (Hv) from room temperature to around Tg, and the tensile strength is 1,600 M
Pa and the bending strength reach 3,000 MPa. The coefficient of thermal expansion α is as small as 1 × 10 ⁻⁵ / K from room temperature to around Tg, the Young's modulus is 91 GPa, and the elastic limit during compression exceeds 4 to 5%. Higher toughness, 6-7J Charpy impact value
/ Cm ² . When the glass transition region is heated while exhibiting such a very high strength characteristic, the flow stress decreases to about 10 MPa. For this reason, it is a feature of the present alloy that it is extremely easy to process and can be formed into a small component having a complicated shape with low stress and a high precision component. Moreover, the processed (deformed) surface has extremely high smoothness due to the characteristics as a so-called glass (amorphous), and substantially no steps such as a step in which a slip band appears on the surface as when a crystalline alloy is deformed. have.

In general, when an amorphous alloy is heated to the glass transition region, crystallization starts due to holding for a long time. However, an alloy having a wide ΔTx such as the present alloy has a stable amorphous phase, and the temperature within ΔTx is adjusted appropriately. No crystal is generated until about 2 hours, and there is no need to worry about crystallization in ordinary molding. In addition, the alloy exerts this property even when solidifying from the molten metal. Generally, rapid cooling is required for the production of an amorphous alloy, but with this alloy, a bulk material consisting of an amorphous single phase can be easily obtained from a molten metal at a cooling rate of about 10 K / s. The solidified surface is still extremely smooth, and has a transferability that faithfully reproduces even micron-order polishing scratches on the mold surface. Therefore, if this alloy is applied as an alloy material,
If the surface of the mold has a surface quality that meets the required characteristics of the molded product, the surface characteristics of the mold can be reproduced as it is in the cast material, and the dimensions can be adjusted and the surface can be adjusted in the conventional mold casting method and mold molding method. The step of adjusting the roughness can be omitted or shortened.

As described above, relatively low hardness, high tensile strength and high bending strength, relatively low Young's modulus, high elasticity limit, high impact resistance, high abrasion resistance, surface smoothness, high precision Features that have both castability and workability are not only suitable as materials for molded products in various fields such as precision parts such as ferrules, sleeves, gears and micromachines of optical fiber connectors, but also apply conventional molding methods. it can.
In addition, since amorphous alloys have high-precision castability and workability, and have excellent transferability that can faithfully reproduce the cavity shape of the mold, by appropriately manufacturing the mold, the mold casting is performed. Shape by molding method or mold molding method,
A molded product satisfying dimensional accuracy and surface quality can be manufactured with high productivity in a single process.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically with reference to the embodiments shown in the accompanying drawings. FIG. 1 (A) ~
(E) shows a schematic configuration of an embodiment of a method for producing a cylinder made of an amorphous alloy by the method of the present invention.
In FIG. 1, reference numeral 1 denotes a melting vessel for melting and holding an alloy material capable of forming an amorphous alloy, and a split mold 3 having a product-shaped cavity 4 is disposed below the vessel 1. . As a heating means (not shown) of the melting vessel 1, any means such as high-frequency induction heating and resistance heating can be adopted. As a material of the melting container 1, a heat-resistant material such as a ceramic or a heat-resistant coating metal material is preferable. On the other hand, the mold 3 can be made of copper, a copper alloy, a cemented carbide, or another metal material. Also,
The mold 3 may be provided with a flow path through which a cooling medium such as a fluid or a gas or a heating medium flows. In order to prevent the formation of an oxide film on the molten metal, the entire apparatus is placed in a vacuum or an inert gas atmosphere such as Ar gas, or at least an inert gas is provided between the melting vessel 1 and the upper part of the mold 3. It is preferable to flow gas.

In manufacturing an amorphous alloy molded product, as shown in FIG. 1A, the melting vessel 1 is heated to melt the amorphous alloy (state higher than the melting point Tm).
After the pores 2 formed at the bottom are connected to the pouring port 5 of the mold 3, pressure is applied to the molten metal A in the melting vessel 1 via, for example, an inert gas, and the bottom of the melting vessel 1 is formed. A predetermined amount of the molten metal A is injected into the cavity 4 of the mold 3 in which the mold temperature (TM) is maintained at a temperature equal to or higher than the glass transition temperature (Tg) through the fine holes 2 and cast. Next, as shown in FIG. 1B, while the mold temperature (TM) is maintained at a temperature equal to or higher than the glass transition temperature (Tg), the mold 3 is divided as shown in FIG. A thin linear core member 6 having a desired diameter is pierced into the casting material B from the hole 4a formed in the bottom of the surface, and is drawn out as shown in FIG. In this process, the cast material is cooled, but until the drawing is completed, the mold temperature is the glass transition temperature (T
g). Then, after cooling the mold temperature to the glass transition temperature (Tg) or lower, the mold 3 is separated as shown in FIG.
An amorphous alloy molded product 8 having a smooth surface that faithfully reproduces the cavity surface of the above is taken out.

FIGS. 2A to 2D show a modification of the above-described method. In this method, first, as shown in FIG. 2A, a thin linear core member 6 is set in advance. The molten metal A is poured into the cavity 4 of the mold 3 in which the mold temperature (TM) is maintained at a temperature equal to or higher than the glass transition temperature (Tg) and cast (FIG. 2 (B)). Next, as shown in FIG. 2 (C), the core member 6 is pulled out of the cast material B while the mold temperature (TM) is maintained at a temperature equal to or higher than the glass transition temperature (Tg), and the fine holes 7 are formed. Molding. Then, after cooling until the mold temperature becomes equal to or lower than the glass transition temperature (Tg), FIG.
As shown in (D), the mold 3 is separated, and the amorphous alloy molded product 8 is taken out.

In the case of the method shown in FIGS. 3A to 3D, first, as shown in FIG. 3A, a thin linear core member 6 is set in advance, and the mold temperature (TM) is reduced. The molten metal A is poured into the cavity 4 of the mold 3 maintained at a temperature lower than the glass transition temperature (Tg) and cast (FIG. 3B). At this stage, the casting material B is cooled to a temperature lower than the glass transition temperature (Tg). Thereafter, the mold 3 is set to the glass transition temperature (T
g) At this time, the core member 6 is heated to a temperature lower than the melting point (Tm), and in this state, the core member 6 is pulled out from the cast material B as shown in FIG. Then, after cooling until the mold temperature becomes equal to or lower than the glass transition temperature (Tg), FIG.
As shown in (D), the mold 3 is separated, and the amorphous alloy molded product 8 is taken out.

The method shown in FIGS. 4A to 4D is similar to the method shown in FIG.
Unlike the methods shown in (A) to (D), the entire cast material is not heated, and only the portion to be formed is heated to the glass transition temperature (T
g) An example of a method of heating to the above temperature is shown. In the case of the method shown in FIGS. 4A to 4D, first, as shown in FIG. 4A, a thin linear core member 6 covered with an insulator 9 is set in advance, and the mold temperature is reduced. The molten metal A is injected into the cavity 4 of the mold 3 in which (TM) is maintained at a temperature lower than the glass transition temperature (Tg) and cast (FIG. 4).
(B)). At this stage, the casting material B has a glass transition temperature (T
g) Cool to a lower temperature. Thereafter, an electric current is applied to the core member 6 to generate heat using the electric resistance, and only the cast material portion near the core member is heated to a temperature equal to or higher than the glass transition temperature (Tg) and lower than the melting point (Tm), In this state, FIG.
As shown in (C), the core member 6 is pulled out from the cast material B, and the small hole 7 is formed. Thereafter, the mold is cooled until the mold temperature becomes equal to or lower than the glass transition temperature (Tg), and then the mold 3 is separated as shown in FIG.

Which of the above-mentioned methods is adopted may be selected according to the glass transition region ΔTx of the amorphous alloy and the capability of forming the amorphous. Further, in the above-described method, the elongated core member 6 having the same diameter is used. However, by using a core member having a wire diameter that is increased stepwise or inclined in the drawing direction, stepwise in the axial direction. It is also possible to form a small hole having an inner diameter that is gradually or inclinedly increased. Further, in each of the embodiments described above, the formation of the through-hole has been described. However, by adjusting the depth of the core member piercing into the amorphous alloy and the height of the core member set in the mold, a desired depth can be obtained. A non-penetrating narrow hole can be formed.

Further, the method of the present invention is not limited to the above-described processing for forming a fine hole, but is also applicable to a general forming method for forming various cross-sectional shapes. FIG. 5 shows Zr ₅₅ A
l ₁₀ Ni ₅ Cu ₃₀ of amorphous alloy CCT is (CCT) curves. In order to prevent crystallization of the molded product (especially in order to maintain the structure of an amorphous single phase), the alloy melt heated to a melting point (Tm) or higher is crystallized as shown by curves a and b in FIG. It must be cooled to a temperature in the glass transition region at a cooling rate that does not enter the transition zone. In this cooling process, the alloy melt is at or above the glass transition temperature (Tg), preferably at the crystallization temperature (Tg), as shown by the curve a in FIG.
x) and the glass transition temperature (Tg) while the temperature is maintained (the forming process is shown by a jagged curve), or as shown by the curve b, the molten alloy is once heated to the glass transition temperature (Tg). Even when cooled to a lower temperature, molding is performed while heating to a temperature higher than or equal to the glass transition temperature (Tg) and lower than the melting point (Tm), preferably between crystallization temperature (Tx) and glass transition temperature (Tg). Then, an amorphous alloy molded product can be obtained.

FIG. 6 is a general explanatory view in which forming processing is performed on an amorphous alloy once manufactured. That is, as shown by the curve c in FIG.
In the CCT (Continuous Cooling Transformation) curve diagram, the glass transition temperature (Tg) or higher and the melting point (T
m) may be rapidly raised to a temperature less than m) and molded at this temperature. Thereafter, by cooling the molded body, an amorphous alloy molded article is obtained. As shown by a curve d in FIG. 6, the melting point (Tg) is higher than the glass transition temperature (Tg).
As long as the temperature is kept below m), two or more molding operations can be performed. As a method of rapidly increasing the temperature, there is a heating method using an image furnace, a PAS (plasma discharge machining apparatus), or the like. This method is not limited to the narrow hole forming as described above, and can be applied to various forming processes. However, the method can be combined so as to perform the above-described narrow hole forming steps.

[0039]

As described above, according to the method of the present invention,
Forming is possible even for complicated or fine shapes, and it is possible to form with high dimensional accuracy, especially for long and narrow holes, and to produce amorphous alloy molded products that satisfy the prescribed shape, dimensional accuracy and surface quality with good productivity. It can be manufactured at low cost. In addition, the amorphous alloy used in the present invention is excellent in strength, toughness, corrosion resistance, etc., and is resistant to wear, deformation, chipping, etc. as various precision molded products, and can be used for a long period of time.

[Brief description of the drawings]

FIG. 1 is a schematic partial sectional view showing one embodiment of a production process of an amorphous alloy molded product of the present invention.

FIG. 2 is a schematic partial sectional view showing another embodiment of the manufacturing process of the amorphous alloy molded product of the present invention.

FIG. 3 is a schematic partial cross-sectional view showing still another embodiment of the production process of the amorphous alloy molded product of the present invention.

FIG. 4 is a schematic partial sectional view showing still another embodiment of the production process of the amorphous alloy molded article of the present invention.

FIG. 5 is a CCT (continuous cooling transformation) curve diagram of a Zr ₅₅ Al ₁₀ Ni ₅ Cu ₃₀ amorphous alloy.

FIG. 6 is a CCT (continuous cooling transformation) curve diagram of a general amorphous alloy.

FIG. 7 is a schematic partial sectional view showing a ferrule for an optical connector in which a capillary portion and a flange portion are integrated.

FIG. 8 is a schematic partial cross-sectional view showing a ferrule for an optical connector in which a capillary and a flange are separate types.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Melting container 3 Die 4 Cavity 6 Core member 7 Fine hole 8 Amorphous alloy molding A Melt B Cast material

Claims (9)

[Claims] 1. A glass transition temperature (Tg) or higher and a melting point (T
m) forming a molded body having a cross-sectional shape of the core member by extracting the core member present in the amorphous alloy in a temperature range of less than m), and cooling the molded body. Manufacturing method of amorphous alloy molded product. 2. A step of injecting a molten metal of a material capable of forming an amorphous alloy into a cavity of a mold, wherein the amorphous alloy is maintained at a temperature equal to or higher than a glass transition temperature (Tg) and lower than a melting point (Tm) in the cavity. A method for producing an amorphous alloy molded article, comprising: a step of forming a molded article having a core member having a cross-sectional shape by piercing a core member into the molded article and pulling out the molded article; and a step of cooling the molded article. 3. A core member having a desired cross-sectional shape set in advance, and a glass transition temperature (Tg) of an amorphous alloy.
As described above, the step of injecting a molten metal of a material capable of forming an amorphous alloy into the cavity of the mold held at a temperature lower than the melting point (Tm), the temperature of the glass transition temperature (Tg) within the cavity being lower than the melting point (Tm). Manufacturing a molded article of an amorphous alloy, comprising: a forming step of extracting a core member from the held amorphous alloy to form a molded body having a cross-sectional shape of the core member, and a step of cooling the molded body. Method. 4. A molten metal of a material capable of forming an amorphous alloy is cast into a cavity of a mold in which a core member having a desired cross-sectional shape is set in advance, and the cast material in the cavity is once cooled to a temperature lower than a glass transition temperature (Tg). A step of cooling to a temperature, forming a molded product in which the core member is drawn out in a state where the cast material in the cavity is heated to a temperature equal to or higher than the glass transition temperature (Tg) and lower than the melting point (Tm) to give a cross-sectional shape of the core member; And a step of cooling the compact. 5. A molten metal of a material capable of forming an amorphous alloy is cast in a cavity of a mold in which a core member having a desired cross-sectional shape is set in advance, and the cast material in the cavity is temporarily cooled to a temperature lower than a glass transition temperature (Tg). Cooling to a temperature, the core member in the cavity is heated by utilizing its electric resistance, and the cast material in the vicinity of the core member is heated to a glass transition temperature (Tg).
As described above, the method includes a molding step of extracting the core member in a state where the core member is heated to a temperature lower than the melting point (Tm) to obtain a molded body having a cross-sectional shape of the core member, and a step of cooling the molded body. Of manufacturing amorphous alloy moldings. 6. The method according to claim 1, wherein the core member is a thin linear member, and a small hole is formed. 7. The amorphous alloy is heated to a temperature not lower than the glass transition temperature (Tg) and lower than the melting point (Tm) at a temperature rising rate that does not touch the nose in a CCT (continuous cooling transformation) curve diagram. And a step of cooling the formed body. 8. The method according to claim 7, wherein the forming step is performed by the forming step according to any one of claims 1 to 6. 9. The optical device according to claim 1, wherein the molded product is a ferrule or a capillary for an optical connector.
The method according to any one of claims 1 to 8.