JP2008100264A - Method for producing a rapidly solidified metal hollow body and apparatus for producing a rapidly solidified metal hollow body - Google Patents

Abstract

A method of manufacturing a rapidly solidified metal hollow body and an apparatus for manufacturing a rapidly solidified metal hollow body capable of easily removing a core and manufacturing a hollow body such as a metal glass having a complicated shape. I will provide a.
A heat source can melt a metal material. The mold 11 has a hollow portion 21. The core 12 is made of graphite and can be pulverized, and is disposed in the hollow portion 21 of the mold 11 so as to have a gap 24 between the inner surface of the hollow portion 21. The molten metal injection means 13 is provided so that the metal material 1 melted by the heat source can be injected into the gap 24. The cooling means can rapidly cool the metal material 1 injected into the gap 24 at a critical cooling rate or higher. The particle injection device 14 is provided so as to be able to spray high-speed particles on the core 12, thereby enabling the core 12 to be pulverized.
[Selection] Figure 1

Description

  The present invention relates to a method for producing a rapidly solidified metal hollow body and a device for producing a rapidly solidified metal hollow body.

  When the molten metal material is rapidly cooled at a critical cooling rate or higher, an alloy having a non-equilibrium cooling phase such as metallic glass, amorphous, quasicrystal, or nanocrystal is generated. Metallic glass is an alloy phase in which a supercooled liquid section exists, as in ordinary glass having an amorphous phase. Such an alloy having a non-equilibrium cooling phase has excellent physical properties. For example, Fe-based metallic glass has a tensile strength 100 times or more that of ordinary metals. Further, the Ni-based metallic glass has a corrosion resistance 1000 times or more that of a normal metal. Furthermore, it exhibits excellent soft magnetism and high magnetic permeability compared to ordinary metals, and has excellent magnetic and electrical characteristics. For this reason, it is used for pressure sensors, minute gears, magnetic materials, parts for aircraft equipment, housings for electrical equipment, and the like. In addition, as an innovative new material, it is expected to further expand its applications.

  Conventionally, as a method for producing metallic glass, a molten metal material is instantaneously cast into a water-cooled mold using a differential pressure casting method, thereby increasing the moving speed of the molten metal, obtaining a large cooling speed, There is a method capable of easily producing the metallic glass (for example, see Patent Document 1). In this method, a straight pipe or the like can be manufactured, but there is a problem that a hollow body having a complicated shape or a hollow body having an arbitrary shape cannot be manufactured.

  Therefore, in order to manufacture a hollow body of complex shape or arbitrarily shaped hollow body made of rapidly solidified metal such as metal glass, amorphous alloy, or nanocrystalline composite metal glass, a metal core is placed in the hollow part of the mold. There is a method in which a metal material is injected after being placed, the metal material is rapidly cooled at a critical cooling rate or more and solidified, and then the core is taken out. At this time, the core is made of metal such as metallic copper or steel material having high thermal conductivity, and can rapidly cool the metallic material.

JP-A-8-109419

  However, the method using a metal core has a problem that after the metal material is rapidly cooled and solidified, the metal core reacts with the metal material or expands and cannot be removed. In addition, there is a problem that a hollow body having a complicated shape such as a spherical hollow body in which the core cannot be taken out cannot be manufactured.

  The present invention has been made paying attention to such a problem, and is a rapidly solidified metal hollow body that can easily take out the core and can manufacture a hollow body such as a complex-shaped metal glass. It is an object of the present invention to provide a manufacturing method and a manufacturing device for a rapidly solidified metal hollow body.

  In order to achieve the above object, a method for producing a rapidly solidified metal hollow body according to the present invention includes a non-metallic core placed between the hollow portion of a mold having a hollow portion and an inner surface of the hollow portion. The molten metal material is poured into the gap, and the molten metal material is injected into the gap, and the metal material is rapidly cooled and solidified at a critical cooling rate or higher, and then the core is taken out.

  In the method for producing a rapidly solidified metal hollow body according to the present invention, a metal material is rapidly cooled at a critical cooling rate or more to be solidified, whereby a metal material such as a metal glass, an amorphous alloy, or a nanocrystalline composite metal glass is used. Hollow bodies can be produced. Since the core is made of a non-metal, it is less likely to react with the metal material than the case of the metal and does not expand easily. For this reason, it is easier to take out the core than when the core is made of metal, and not only a simple hollow body such as a straight pipe but also a complex hollow body can be manufactured. it can. In addition, it is preferable that melting | fusing point is 700 degree | times or more so that a core may not melt | dissolve with the heat | fever of a metal material.

  In the method for producing a rapidly solidified metal hollow body according to the present invention, the core can be pulverized from carbon, ceramics, sand or clay, and the core is preferably pulverized and taken out. In this case, since the core is finely pulverized and taken out, it is not necessary to take out the core as it is. For this reason, hollows with more complicated shapes such as spherical hollow bodies whose inside is larger than the outlet of the core, hollow bodies having holes penetrating the thickness from the inner surface to the outer surface, and pipe-shaped hollow bodies whose inner diameter changes The body can be manufactured. The core is particularly preferably made of graphite. When the core is made of graphite, it is easy to remove the core from the inner surface of the hollow body due to the lubricity of graphite. Moreover, since it does not react with a metal material, a hollow body with a clean inner surface can be produced.

  In the method for producing a rapidly solidified metal hollow body according to the present invention, it is preferable that high-speed particles are sprayed on the core, and the core is pulverized and taken out. In this case, the core can be easily pulverized. By spraying particles having a small diameter, the core can be pulverized by spraying the particles to the inside of the hollow body even when the outlet of the core is small. The particles are preferably sprayed by shot peening.

  In the method for producing a rapidly solidified metal hollow body according to the present invention, a release agent may be applied to the surface of the core. In this case, the core can be easily and cleanly removed from the inner surface of the hollow body by the release agent. The release agent is made of, for example, boron nitride.

  In the method for manufacturing a rapidly solidified metal hollow body according to the present invention, the core may include a heat conductive material. In this case, since the heat of the metal material is transmitted through the core, the cooling rate of the metal material can be increased.

  In the method for manufacturing a rapidly solidified metal hollow body according to the present invention, the core may be provided so that the metal material injected into the gap can be cooled. In this case, the cooling rate of the metal material can be increased. For example, the core has a circulation path for circulating cooling water therein, and the metal material can be cooled by flowing cooling water through the circulation path.

  In the method for producing a rapidly solidified metal hollow body according to the present invention, it is preferable to apply pressure to the molten metal material and inject it into the gap. In this case, even if the metal material injected into the gap flows into a plurality of paths and then flows so as to merge, it can be integrally joined by so-called molten metal joining at the joining position. For this reason, it is possible to prevent the strength from decreasing at the joining position, and it is possible to manufacture a hollow body having a high strength. In addition, a narrow gap can be filled with a metal material, and poor filling can be prevented.

  The apparatus for producing a rapidly solidified metal hollow body according to the present invention is a heat source capable of melting a metal material, a mold having a hollow part, and can be pulverized from carbon, ceramics, sand or clay, Molten metal injection provided in the hollow portion of the mold so that the core disposed so as to have a gap between the inner surface of the hollow portion and the metal material melted by the heat source can be injected into the gap. And a cooling means capable of rapidly cooling the metal material injected into the gap at a critical cooling rate or higher, and a particle injection device provided so that high-speed particles can be sprayed onto the core. To do.

  The apparatus for producing a rapidly solidified metal hollow body according to the present invention is used to produce a rapidly solidified metal hollow body such as metal glass, amorphous alloy, or nanocrystalline composite metal glass. First, the metal material melted by the heat source is injected into the gap between the mold and the core by the molten metal injection means. At this time, since the core is made of carbon, ceramics, sand, or clay, and is not made of metal, it is less likely to react with the metal material and is less likely to expand than metal.

  The metal material is rapidly cooled and solidified by a cooling means at a critical cooling rate or more, and high-speed particles are sprayed onto the core by a particle injection device, and the core is pulverized and taken out. Since the core is finely pulverized and taken out, it is not necessary to take out the core as it is. For this reason, hollows with more complicated shapes such as spherical hollow bodies whose inside is larger than the outlet of the core, hollow bodies having holes penetrating the thickness from the inner surface to the outer surface, and pipe-shaped hollow bodies whose inner diameter changes The body can be manufactured. By spraying particles having a small diameter by the particle injection device, the core can be pulverized by spraying the particles to the inside of the hollow body even when the outlet of the core is small. Thus, a rapidly solidified metal hollow body such as metal glass, amorphous alloy, or nanocrystalline composite metal glass can be produced.

  In addition, it is preferable that melting | fusing point is 700 degree | times or more so that a core may not melt | dissolve with the heat | fever of a metal material. The core is particularly preferably made of graphite. When the core is made of graphite, it is easy to remove the core from the inner surface of the hollow body due to the lubricity of graphite. Moreover, since it does not react with a metal material, a hollow body with a clean inner surface can be produced. It is preferable that the particle injection device is composed of a device for shot peening.

  According to the present invention, a method for producing a rapidly solidified metal hollow body and a rapidly solidified metal hollow body capable of easily taking out the core and producing a hollow body such as a metal glass having a complicated shape. The manufacturing apparatus can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a method for producing a rapidly solidified metal hollow body and an apparatus for producing a rapidly solidified metal hollow body according to an embodiment of the present invention.
As shown in FIGS. 1 and 2, a rapidly solidified metal hollow body manufacturing apparatus includes a heat source (not shown), a mold 11, a core 12, a molten metal injection means 13, and a cooling means (not shown). Particle injection device 14.

The heat source is provided so that the metal material 1 that is a raw material of the rapidly solidified metal such as metal glass, amorphous alloy, or nanocrystalline composite metal glass can be melted.
As shown in FIGS. 1 and 2, the mold 11 has a hollow portion 21, an inlet 22, and a flow path 23. The mold 11 can be divided into two parts by opening the hollow part 21 so that a product manufactured by the hollow part 21 can be taken out. The inlet 22 is formed on the outer surface of the mold 11. The flow path 23 is provided so as to communicate the inlet 22 and the hollow portion 21. In the mold 11, the metal material 1 melted by a heat source is injected from the injection port 22 through the flow path 23 into the hollow portion 21.

As shown in FIGS. 1 and 2, the core 12 is made of graphite, has a melting point of 700 ° C. or more, and has a strength capable of being pulverized by collision of high-speed fine particles. The core 12 is arranged in the hollow portion 21 of the mold 11 so as to have a gap 24 between the inner surface of the hollow portion 21.
As shown in FIG. 2, the molten metal injection means 13 is connected to a heat source, and is provided so that the metal material 1 melted by the heat source can be poured into the injection port 22 of the mold 11 and injected into the gap 24. Yes. The molten metal injection means 13 is provided so as to be able to inject into the gap 24 by applying pressure to the molten metal material 1.

The cooling means has a water channel provided inside the mold 11 so as to go around the hollow portion 21 and cooling water. The cooling means is capable of rapidly cooling the metal material 1 injected into the gap 24 at a critical cooling rate or higher by circulating the cooling water through the flow channel.
As shown in FIG. 1, the particle injection device 14 includes a device for shot peening. The particle injection device 14 can spray high-speed fine particles onto the core 12 taken out from the mold 11, thereby enabling the core 12 to be pulverized.

  In a specific example shown in FIGS. 1A and 1B, the hollow portion 21 has a cylindrical shape, the core 12 has a cylindrical shape with an outer diameter smaller than the inner diameter of the hollow portion 21, and the gap 24 Has a straight pipe shape. In the specific example shown in FIGS. 1C, 1 </ b> D, and 2, the hollow portion 21 has a substantially elliptical shape, and the core 12 has an elliptical shape having an outer diameter smaller than the inner diameter of the hollow portion 21. The gap 24 has an ellipsoidal shell shape. In addition, the space | gap 24 may comprise not only the shape of FIG. 1 and FIG. 2, but more complicated shapes, such as a spherical shell shape and the pipe shape from which an internal diameter changes.

  The manufacturing method of the rapidly solidified metal hollow body according to the embodiment of the present invention is a method that is performed by the rapidly solidified metal hollow body manufacturing apparatus according to the embodiment of the present invention. First, as shown in FIGS. 1A, 1C, and 2, the metal material 1 melted by the heat source is pressed between the mold 11 and the core 12 by the molten metal injection means 13 under pressure. Injection into the gap 24. At this time, since the core 12 is made of graphite, it hardly reacts with the metal material 1 and does not easily expand as compared with the case where it is made of metal.

  The metal material 1 is rapidly cooled by a cooling means at a critical cooling rate or more to be solidified, and taken out from the mold 11 after solidification. As shown in FIGS. 1B and 1D, high-speed fine particles are sprayed onto the core 12 by the particle injection device 14, and the core 12 is crushed and taken out. Since the particle injection device 14 includes a device for shot peening, the core 12 can be easily pulverized. Since the core 12 is finely pulverized and taken out, it is not necessary to take out the core 12 as it is. Even when the outlet of the core 12 is small, the core 12 can be pulverized by spraying particles to the inside of the hollow body 2. For this reason, the hollow body 2 having a spherical shape whose inside is larger than the outlet of the core 12, the hollow body 2 having a hole penetrating the thickness from the inner surface to the outer surface, the pipe-shaped hollow body 2 whose inner diameter changes, and the like are more complicated. A hollow body 2 having a simple shape can be manufactured. Thus, a rapidly solidified metal hollow body 2 such as metal glass, amorphous alloy, or nanocrystalline composite metal glass can be produced.

  Since the core 12 is made of graphite, it is easy to remove the core 12 from the inner surface of the hollow body 2 due to the lubricity of the graphite. Moreover, since it does not react with the metal material 1, the hollow body 2 with a clean inner surface can be manufactured.

  Since the molten metal injection means 13 injects the molten metal material 1 under pressure, as shown in FIG. 2, the metal material 1 injected into the gap 24 is divided into a plurality of paths and then merges. Even if it flows, it can be joined integrally by so-called molten metal joining at the joining position 1a. For this reason, it is possible to prevent the strength from being lowered at the joining position, and it is possible to manufacture the hollow body 2 having a high strength. In addition, the narrow gap 24 can be filled with the metal material 1, and filling failure can be prevented.

  According to the method for producing a rapidly solidified metal hollow body and the apparatus for producing a rapidly solidified metal hollow body according to an embodiment of the present invention, for example, as shown in FIGS. 3 (a) and 3 (b), the outer diameter 5 mm, 35 mm in length, and pipe 3 having an ultrafine hole 3 a having an inner diameter of 0.5 mm can be manufactured. Further, as shown in FIGS. 3C and 3D, it is possible to manufacture a pipe 4 having a wall thickness of 0.4 mm and having two lateral holes 4a, the diameter of which changes. In addition, hollow bodies 2 having various shapes such as a pipe having an outer diameter of 3.8 mm, an inner diameter of 3.0 mm, and a length of 100 mm, and a metal pipe with a copper screw can be manufactured. Thereby, practical products, such as a pipe, a housing shell, a spherical product, and a harmonica-like part for vehicles, can be easily manufactured.

  X-ray diffraction is performed on the hollow body 2 manufactured by the method for manufacturing a rapidly solidified metal hollow body and the rapidly solidified metal hollow body manufacturing apparatus of the embodiment of the present invention, and the results are shown in FIG. As shown in FIG. 4, only a broad halo peak was observed in the X-ray diffraction pattern, and it was confirmed that the constituent phase of the hollow body 2 was mainly an amorphous phase.

  In the method for manufacturing a rapidly solidified metal hollow body and the rapidly solidified metal hollow body manufacturing apparatus according to the embodiment of the present invention, the core 12 is coated with a release agent made of boron nitride on the surface. It may be. In this case, the core 12 can be easily and cleanly removed from the inner surface of the hollow body 2 by the release agent.

  Further, the core 12 may include a heat conductive material. In this case, since the heat of the metal material 1 is transmitted through the core 12, the cooling rate of the metal material 1 can be increased. Further, the core 12 may have a circulation path for circulating cooling water therein, and the metal material 1 injected into the gap 24 may be cooled by flowing the cooling water through the circulation path. In this case, the cooling rate of the metal material 1 can be increased.

Sectional drawing which shows the state inject | poured into the casting_mold | template in the case of manufacturing the (a) pipe in the manufacturing method of the rapidly solidified metal hollow body of embodiment of this invention, and the manufacturing apparatus of the rapidly solidified metal hollow body, (b ) An enlarged cross-sectional view showing a state where the core is pulverized when manufacturing a pipe, (c) a cross-sectional view showing a state where the core is injected into a mold when manufacturing an elliptical shell-like hollow body, (b) It is sectional drawing which shows the state which grind | pulverizes the core in the case of manufacturing an elliptical shell-like hollow body. It is sectional drawing which shows the state currently inject | poured into the casting_mold | template of the manufacturing method of the rapidly solidified metal hollow body of embodiment of this invention, and the rapidly solidified metal hollow body manufacturing apparatus. (A) A side view showing a pipe manufactured by a method for manufacturing a rapidly solidified metal hollow body and a rapidly solidified metal hollow body manufacturing apparatus according to an embodiment of the present invention, (b) a front view showing the pipe, (C) It is a side view which shows the pipe from which a diameter changes, (d) It is a front view which shows the pipe from which a diameter changes. It is an X-ray diffraction pattern of the hollow body manufactured by the manufacturing method of the rapidly solidified metal hollow body and the rapidly solidified metal hollow body manufacturing apparatus of the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal material 2 Hollow body 11 Mold 12 Core 13 Molten metal injection | pouring means 14 Particle injection apparatus 21 Hollow part 22 Inlet 23 Channel 24 Space | gap

Claims (8)

  A non-metallic core is arranged in the hollow part of the mold having a hollow part so as to have a gap between the inner surface of the hollow part, and a molten metal material is injected into the gap, and the metal material is made critical. A method for producing a rapidly solidified metal hollow body, characterized in that the core is taken out after being rapidly cooled and solidified at a cooling rate or higher.   2. The method for producing a rapidly solidified metal hollow body according to claim 1, wherein the core is made of carbon, ceramics, sand, or clay and can be pulverized, and the core is pulverized and taken out. .   3. The method for producing a rapidly solidified metal hollow body according to claim 2, wherein high-speed particles are sprayed on the core, and the core is pulverized and taken out.   The method for producing a rapidly solidified metal hollow body according to claim 1, 2 or 3, wherein a release agent is applied to the surface of the core.   The method for producing a rapidly solidified metal hollow body according to claim 1, 2, 3, or 4, wherein the core includes a heat conductive material.   6. The method for producing a rapidly solidified metal hollow body according to claim 1, wherein the core is provided so that the metal material injected into the gap can be cooled. .   7. The method for producing a rapidly solidified metal hollow body according to claim 1, wherein pressure is applied to the molten metal material and the molten metal material is injected into the gap. A heat source capable of melting a metal material;
A mold having a hollow portion;
A core made of carbon, made of ceramics, made of sand or clay, pulverizable, and disposed in the hollow portion of the mold so as to have a gap between the inner surface of the hollow portion;
Molten metal injection means provided so as to be able to inject the metal material melted by the heat source into the gap;
A cooling means capable of rapidly cooling the metal material injected into the gap at a critical cooling rate or higher;
A particle injection device provided so that high-speed particles can be sprayed onto the core;
An apparatus for producing a hollow body made of rapidly solidified metal, characterized by comprising:

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