JP2015098044A - Forming device of metallic glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming device of metallic glass capable of improving forming property of the metallic glass by preventing rapid cooling of a part of molten metal and capable of rationalization of a device configuration by simplifying a movement direction of a mold.SOLUTION: A forming device of metallic glass includes a receiving mold 20 provided with a cavity 21a for forming, a pressing mold 30 for pressing molten metal 10 into the cavity 21a for forming and a pressing driving mechanism part 40 which moves the pressing mold 30 to a pressing direction. Therein, the receiving mold 20 is constituted with a cavity mold part 21 formed of the cavity 21a for forming and a cooling base mold part 25 which facilitates the cooling of the molten metal 10 by having the cavity mold part 21 received in a nest shape and brought into contact with the cooling base mold part 25, and a driving mechanism part 50 of the cavity mold part which performs a reciprocating motion of the cavity mold part 21 along the pressing direction of the pressing mold 30 with respect to the cooling base mold part 25 is provided.

Description

  The present invention comprises a receiving mold provided with a molding cavity so as to form a metallic glass molded body by pressing a molten metal and cooling it faster than the critical cooling rate of crystallization, The present invention relates to a metal glass molding apparatus including a pressing mold that presses the molten metal into a cavity and a pressing drive mechanism that moves the pressing mold in a pressing direction.

  Conventionally, as a metallic glass molding method, for example, the alloy material is melted in a melting furnace having an open upper surface, and tilted while the molten alloy material is melted again in a forced cooling mold having a molding cavity. A method of manufacturing large bulk metallic glass that is pressure-cooled with an upper punch that also serves to promote cooling with a size that almost covers the upper surface of the molten metal surface of the cavity of the forced cooling mold. A so-called tilt casting method is known as described in Document 1.

  However, this tilt casting method is effective for obtaining, for example, a rod-like or relatively thick metallic glass molded body. For example, as a method for molding a planar and relatively thin metallic glass, molten metal is used. It cannot be used effectively due to problems such as fluidity.

  For this, conventionally, for example, an upper mold having a smooth curved surface or a flat surface and a lower mold having a cavity portion are formed, and the upper mold and the lower mold do not have a fitting portion. A metal material is installed in the lower mold of the press mold, and the metal material is melted using a high-energy heat source capable of melting the metal material, and the upper mold and the lower mold are swung from a relatively inclined shape. Metals that are pressed to overlap each other in parallel and deformed into a predetermined shape by melting the molten metal above the melting point, and cooling the molten metal at a critical cooling rate or higher simultaneously with or after the deformation A method for easily producing a glass molded product (see Patent Document 2) has been proposed. In this method of manufacturing a metal glass molded product, in the cavity portion where the molten pool portion where the molten metal is held and the product molded portion where the molded product of the metal glass is molded are adjacent, the molten metal is the molten pool portion. Since the moved molten metal portion is rapidly cooled by being moved to the product molding portion, a metal glass product molded body can be obtained.

  However, in this metal glass molded product manufacturing method, the upper mold and the lower mold are relatively swung from the inclined shape and pressed, and the linear motion (linear motion) is converted into rotation. Since the pressing is performed by tilting, there is a problem that a large portion of the molded body that does not become a metal glass product remains in the molten pool portion where the molten metal is held, and the production efficiency cannot be improved. Furthermore, the cavity part is formed so that it may follow a horizontal surface or a smooth curved surface, and the pressed molten metal is difficult to spread laterally within the cavity part, resulting in a problem that stable molding cannot be performed.

  In contrast, the present applicant presses the molten metal and cools it faster than the critical cooling rate of crystallization to form a metallic glass molded body, And a lower mold having a molten pool portion provided adjacent to the cavity and held in a state where the molten metal is accumulated in a pre-molding process, wherein the lower mold is It has one inclined portion and the other inclined portion so as to have a valley bottom portion, the valley bottom portion is configured as the melt pool portion, and the one inclined portion guides the slide movement of the upper mold. The upper inclined portion is guided by the slide guide portion, and the guided portion is guided to melt the melt. After moving to the reservoir And the pressing surface provided in an angle form that can be rotated and pressed toward the cavity side, and the upper die is pressed to press the molten metal to the other inclined portion side by the pressing surface. A slide drive mechanism that moves to the melt reservoir along the guide portion, and the upper die for pressing the molten metal into the cavity while pushing the molten metal toward the other inclined portion by the pressing surface. There has been proposed a press mold (see Patent Document 3) for molding metal glass, which is provided with a rotation drive mechanism that rotates at a portion. According to this, the site | part of the molded object which does not become a product of metal glass can be made small, and a molten metal can be pressed suitably, and production efficiency can be improved.

JP2009-68101 (first page) JP-A-11-104809 (first page) Japanese Patent No. 5145480 (Claim 1)

The problem to be solved regarding the metal glass molding apparatus is that in the conventional apparatus, a portion where the raw metal is melted into the molten metal and a cavity portion where the molten metal is transferred and molded are provided separately. It is in the point. According to this, the molten metal is partly rapidly cooled before being transferred to the cavity and molded, and the fluidity tends to be lost, and solidification easily proceeds without reaching every corner of the cavity. Therefore, the metallic glass may not be molded into a desired shape depending on the shape to be molded. Moreover, in the conventional apparatus, as operation | movement of the metal mold | die including the operation | movement which pours molten metal, it has linear operation | movement (linear motion) and operation | movement of two directions of rotation, and the apparatus structure containing a drive form It was difficult to achieve further rationalization.
Therefore, an object of the present invention is to improve the metal glass moldability by preventing partial quenching of the molten metal, and simplify the operation direction of the metal mold to rationalize the apparatus configuration. The object is to provide a glass molding apparatus.

The present invention has the following configuration in order to achieve the above object.
According to one aspect of the metallic glass molding apparatus according to the present invention, a molding cavity is formed so as to form a metallic glass molding by pressing the molten metal and cooling it faster than the critical cooling rate of crystallization. A metal glass molding apparatus comprising: a receiving mold provided with: a pressing mold that presses the molten metal into the molding cavity; and a pressing drive mechanism that moves the pressing mold in a pressing direction. The receiving mold is constituted by a cavity mold part in which the molding cavity is formed, and a cooling base mold part that promotes cooling of the molten metal by receiving and contacting the cavity mold part, When the cavity mold part is separated from the cooling base mold part when the raw metal is melted and the molten metal is pressed by the pressing mold, the molten metal is cooled. Is close As is comprises a drive mechanism of the cavity mold section to reciprocate along the pressing direction of the pressing mold.

  Further, according to one embodiment of the metallic glass molding apparatus according to the present invention, the apparatus includes a high-frequency heating coil surrounding the cavity mold part in a state where the cavity mold part is separated from the cooling base mold part, A high-frequency heating device provided to melt the raw material metal by heating with the high-frequency heating coil can be provided.

Further, according to one embodiment of the metallic glass molding apparatus according to the present invention, the outer surface of the cavity mold part that contacts the cooling base mold part is provided in a conical shape, and the outer surface of the cavity mold part is An inner side surface of the cooling base mold portion that is received in contact with the inner surface is provided in a conical surface shape corresponding to the shape of the outer surface of the cavity mold portion.
Further, according to one embodiment of the metallic glass molding apparatus according to the present invention, an outer surface of the cavity mold part that contacts the cooling base mold part is provided in an uneven shape so as to increase a surface area, and the cavity mold part The inner side surface of the cooling base mold part that receives and contacts the outer surface of the cavity mold part is provided in an uneven shape corresponding to the shape of the outer surface of the cavity mold part. .

  According to another aspect of the metal glass molding apparatus of the present invention, the cavity mold part extended to the cooling base mold part side of the cavity mold part is the cooling base mold. The drive mechanism of the cavity mold part is configured so that the cavity mold part is driven through an extension of the cavity mold part. can do.

  Moreover, according to one form of the metallic glass shaping | molding apparatus which concerns on this invention, the press surface part which contacts and presses at least the said molten metal of the said press type | mold is the said high frequency heating apparatus part at least in the heating process which concerns on this molten metal. It can be characterized by being arranged to be heated.

  According to the metal glass molding apparatus of the present invention, it is possible to improve the moldability of the metal glass by preventing partial rapid cooling of the molten metal, and streamline the apparatus configuration by simplifying the operation direction of the mold. It has a particularly advantageous effect of being able to.

It is explanatory drawing including the cross-sectional shape which shows typically the example of the shaping | molding apparatus of the metallic glass which concerns on this invention. It is process drawing explaining the shaping | molding process of the metallic glass using the example of a form of FIG. It is explanatory drawing including the cross-sectional shape which shows typically the other example of a shaping | molding apparatus of the metallic glass which concerns on this invention. It is process drawing explaining the shaping | molding process of the metal glass using the example of a form of FIG. It is process drawing which demonstrates typically the other example of a shaping | molding apparatus of the metallic glass which concerns on this invention. It is process drawing which demonstrates typically the other example of a shaping | molding apparatus of the metallic glass which concerns on this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a metal glass molding apparatus according to the present invention will be described in detail with reference to the accompanying drawings (FIGS. 1 and 2).
The metal glass molding apparatus according to the present invention has, as a basic configuration, a molding cavity that presses the molten metal 10 and cools it faster than the critical cooling rate for crystallization to form a metal glass molded body. A receiving mold 20 provided with 21a, a pressing mold 30 that presses the molten metal 10 into the molding cavity 21a, and a pressing drive mechanism 40 that moves the pressing mold 30 in the pressing direction. Reference numeral 32 denotes an extension part of the pressing mold, through which the pressing mold 30 is pressed by the pressing drive mechanism 40.

  The receiving mold 20 of the metallic glass molding apparatus according to the present invention cools the molten metal 10 by receiving and contacting the cavity mold part 21 in which the molding cavity 21a is formed. It is comprised by the base mold | type part 25 for cooling to accelerate | stimulate. The cooling base mold portion 25 of this embodiment is provided with a water cooling water passage hole 25a. By passing cooling water or other refrigerant through the water cooling water passage hole 25a, the cooling base mold portion 25a is provided. The molten metal 10 can be rapidly cooled from the portion 25 through the molding cavity 21a. The cooling base mold portion 25 can be formed in a very large form as compared with the molding cavity 21a and the pressing mold 30, and this can increase the capacity to absorb heat, thereby enabling rapid cooling. . At this time, in order to improve the thermal conductivity, as a material of the cooling base mold portion 25, for example, a composite material using an aluminum material, copper, sapphire, or carbon nanotube can be used.

  Reference numeral 50 denotes a drive mechanism unit for the cavity mold part. The cavity mold part 21 is separated from the cooling base mold part 25 when the raw metal is melted and the molten metal is pressed by the pressing mold 30. In such a state, the molten metal is provided so as to reciprocate along the pressing direction by the pressing drive mechanism 40 of the pressing mold 30 so as to contact the molten metal when it is cooled.

In this way, by forming the receiving mold 20 in a divided manner, in the heating process for melting the raw material metal and the pressing process for pressing the molten metal in the manufacturing process of the metallic glass molded body, only the cavity mold portion 21 is formed. Can be used to maintain the required high temperature. In the molten metal cooling step, the cavity mold portion 21 and the cooling base mold portion 25 can be combined and rapidly cooled, and the metal glass molded body 11 (FIGS. 2D and 4C). )) Can be manufactured efficiently.
Further, in the cooling step, the pressing die 30 is provided so as to be able to contact the cooling base die portion 25 so that the pressing die 30 can be directly cooled by the cooling base die portion 25.

  Reference numeral 60 denotes a high-frequency heating device, which includes a high-frequency heating coil 61 that surrounds the cavity mold 21 when the cavity mold 21 is separated from the cooling base mold 25. It is provided to melt the raw metal by heating with the coil 61. According to this embodiment, the cavity mold portion 21 and the pressing mold 30 are configured to move (reciprocate) along the axial direction (the pressing direction of the pressing mold 30) in the high-frequency heating coil 61. . In the heating step of melting the raw metal placed on the cavity mold 21, the cavity mold 21 is the drive mechanism of the cavity mold so that the raw metal is located at the center of the high frequency heating coil 61. 50. According to this, the raw material metal can be appropriately melted to form a molten metal. In addition, as a method of melting the raw material metal, it is possible to use other high energy sources. For example, arc discharge using an arc heat source, plasma, electron beam, laser, or the like can be used.

  Further, according to the present embodiment, the outer surface 21b that contacts the cooling base mold portion 25 of the cavity mold portion 21 is provided in a conical surface shape, and the outer surface 21b of the cavity mold portion is received in a nested manner to be in contact. The inner surface 25b of the cooling base mold part is provided in a conical surface shape corresponding to the shape of the outer surface 21b of the cavity mold part. That is, the outer side surface 21b of the cavity mold part is configured to fit in contact with the inner side surface 25b of the cooling base mold part. According to this, the cavity mold part 21 can be suitably received by the cooling base mold part 25, and the efficiency of heat conduction can be increased, and the molten metal 10 is rapidly cooled to form the metallic glass molded body 11. Can be produced efficiently.

  Further, according to the present embodiment, the outer surface 21b that contacts the cooling base mold portion 25 of the cavity mold portion 21 is provided in an uneven shape so as to increase the surface area, and the outer surface 21b of the cavity mold portion is nested. The inner side surface 25b of the cooling base mold part which is received and contacted is provided in an uneven shape corresponding to the shape of the outer side surface 21b of the cavity mold part. According to this, since the surface area to which heat is transferred is increased, the heat transfer performance is improved, and the molten metal 10 can be cooled more quickly and efficiently.

  Further, according to the present embodiment, the cavity mold part extension 22 formed by extending the cavity mold part 21 toward the cooling base mold part 25 is inserted into the central through hole 25 c of the cooling base mold part 25. The cavity mold part drive mechanism 50 is configured such that the cavity mold part 21 is driven via the extension part 22 of the cavity mold part.

According to the drive mechanism section 50 of the cavity mold section, in conjunction with the pressing drive mechanism 40, the linear movement of the reciprocating movement of the cavity mold section 21 with respect to the cooling base mold section 25 can be rationally performed. The outer side surface 21b of the mold part can be suitably brought into and out of contact with the inner side surface 25b of the base mold part for cooling.
In addition, as the drive mechanism unit 50 and the press drive mechanism unit 40 of the cavity mold unit, a press operation such as a mechanism that converts hydraulic pressure, air pressure, and electric force into a pressing force, or a mechanism that uses an elastic member such as a coil spring, etc. A known pressing technique may be selectively used according to the specifications.

In addition, according to the present embodiment, at least the heating step related to the molten metal 10 is performed by the pressing surface portion 31 that contacts and presses at least the molten metal 10 of the pressing mold 30 (see FIGS. 2A and 4A). Are arranged so as to be heated by the high-frequency heating device 60.
According to this, it can prevent that only the part which contacts the press surface part 31 of the molten metal 10 in a press process can be cooled, press the molten metal 10 more stably, and can improve the moldability more. Thus, it is possible to accurately and efficiently produce a molded body of metallic glass.

  Reference numeral 26 denotes a cooling water supply unit, which is a device that supplies water as a coolant to the water cooling water passage hole 25a of the cooling base mold unit 25. Note that the refrigerant is not limited to water, and a fluid that is another refrigerant may be supplied by a device similar to the cooling water supply unit 26.

  Further, as shown in FIG. 4 (d), reference numeral 27 denotes a discharge pin. In the present embodiment, the metal pin 11 is extruded from the central portion of the cavity mold 21 along the axis, and is extruded. It is provided to discharge. The form of the discharge pin 27 is not limited to this, and it is needless to say that a plurality of discharge pins 27 can be appropriately set according to the shape of the metal glass molded body 11.

  Next, a molding method according to the embodiment shown in FIG. 1 will be described with reference to FIG. In this embodiment, the molding apparatus is in a vertically placed state so that the pressing mold 30 and the cavity mold section 21 are reciprocated in the vertical direction by the pressing drive mechanism section 40 and the cavity mold section driving mechanism section 50. It is configured.

  FIG. 2A shows a heating process, in which a metal serving as a raw material for the metallic glass disposed in the molding cavity 21a of the cavity mold portion 21 located inside the coil is heated by a high-frequency heating coil 61. It is heated to become. At the same time, the cavity mold part 21 and the pressing surface part 31 of the pressing mold 30 are also heated, and the material and the mold become high temperature. Note that the cavity mold portion 21 and the pressing mold 30 may be made of a material that has a higher melting point than the metal that is the raw material of the metal glass and does not melt.

  FIG. 2B shows an initial stage of the pressing process, and shows a state where the pressing die 30 is lowered and the molten metal 10 is started to be pressed. FIG. 2C shows a state in which pressing by the pressing die in the pressing process is completed and the molten metal 10 is filled in the molding cavity 21a. In this pressing step, the cavity mold part 21 and the pressing mold 30 together with the molten metal 10 are heated by the high frequency heating coil 61 or at least not forcedly cooled. Good. For this reason, the molten metal 10 spreads to every corner of the cavity 21a for molding, and the moldability can be improved.

  FIG. 2D shows a cooling process, in which the cavity mold part 21 and the pressing mold 30 are linked to a driving mechanism part 50 (see FIG. 1) of the cavity mold part and a pressing drive mechanism part 40 (see FIG. 1). By being interlocked, in a state where the pressing state by the pressing die 30 is continued and maintained, it is pressed toward the cooling base die portion 25 side, and the outer side surface 21b of the cavity die portion is brought into contact with the inner side surface 25b of the cooling base die portion. Is touched. According to this, the molten metal 10 can be rapidly cooled by the cooling base mold part 25 via the cavity mold part 21.

Next, another embodiment of the metal glass molding apparatus according to the present invention will be described with reference to FIG.
The present embodiment is a horizontally placed molding apparatus, and the pressing mold 30 and the cavity mold 21 are reciprocated in the lateral direction by the pressing mechanism 40 and the cavity driving mechanism 50. It is configured. In this embodiment, the raw material metal is placed on the molten metal reservoir 21c and melted by the high frequency heating coil 61.
The operating direction of the pressing mold 30 and the cavity mold part 21 is not particularly limited, for example, the cavity mold part 21 is inclined so that the molten metal 10 does not spill from the molten metal reservoir part 21c.

Next, the molding process according to the embodiment shown in FIG. 3 will be described with reference to FIG.
FIG. 4A shows a heating process, which is a metallic glass disposed in a molten metal reservoir 21c, which is a cavity 21a for molding the cavity mold portion 21 located inside by a coil 61 for high-frequency heating. The metal used as the raw material is heated so as to become the molten metal 10. At the same time, the cavity mold part 21 and the pressing surface part 31 of the pressing mold 30 are also heated, and the material and the mold become high temperature.

  FIG. 4B shows a pressing process, in which the pressing by the pressing die is completed and the molten metal 10 is filled in the cavity 21a. In this pressing step, the cavity mold part 21 and the pressing mold 30 together with the molten metal 10 are heated by the high frequency heating coil 61 or at least not forcedly cooled. Good. For this reason, the molten metal 10 spreads to every corner of the cavity 21a for molding, and the moldability can be improved.

  FIG. 4C shows a cooling process, in which the cavity mold part 21 and the pressing mold 30 are pressed toward the cooling base mold part 25, and the outer side surface 21b of the cavity mold part is brought into contact with the inner surface 25b of the cooling base mold part. Is touched. According to this, the molten metal 10 can be rapidly cooled by the cooling base mold part 25 via the cavity mold part 21.

  FIG. 4D shows a step of taking out the metal glass molding 11 (discharge step). In this step, the cavity mold part 21 and the pressing mold 30 are separated from the cooling base mold part 25 by the cavity mold part driving mechanism 50 (see FIG. 3) and the pressing drive mechanism part 40 (see FIG. 3). Furthermore, it is moved to the outside of the coil 61 for high-frequency heating so that the portion of the molding cavity 21a is removed. Further, the mold is opened by moving the pressing mold 30 away from the cavity mold section 21 by the pressing drive mechanism section 40. Further, the metal glass molded body 11 is pushed out by the discharge pin 27 and released. According to this process, the metal glass molding 11 is suitably discharged by performing a series of operations in one axial direction.

Next, based on FIG. 5, another embodiment of the metal glass molding apparatus according to the present invention and an example of a molding process using the apparatus will be described.
In this embodiment, compared with the embodiment shown in FIGS. 1 and 2, the molding cavity 21a is formed in a concave curved surface, and the pressing surface portion 31 of the pressing die 30 protrudes so as to have a convex curved surface. It is different in that it is formed in a state. According to this, by the same molding process as the embodiment shown in FIGS. 1 and 2, the metal glass molding 11 having a curved surface can be suitably and similarly molded as in the embodiment.

Next, based on FIG. 6, another embodiment of the metal glass molding apparatus according to the present invention and an example of a molding process using the apparatus will be described.
In this embodiment, compared with the embodiment shown in FIGS. 1 and 2, a molding cavity 21a is provided on the upper surface of the cavity mold portion 21 protruding upward in a trapezoidal cross section, and the cavity mold portion 21 and the cooling cavity 21 are cooled. The fitting relationship of the concavo-convex that is nested with the base mold portion 25 is opposite. In other words, the tapered outer side surface provided so as to narrow downward on the upper side of the cooling base mold part 25 on the tapered inner side surface 21 d provided so as to spread downward on the lower side of the cavity mold part 21. 25d fits into contact. Also in this manner, the metallic glass molded body 11 can be molded in the same manner as in the above-described embodiment by the same molding process as that in the embodiment shown in FIGS.

  As described above, the present invention has been described in various ways with preferred embodiments. However, the present invention is not limited to these embodiments, and many modifications can be made without departing from the spirit of the invention. That is.

DESCRIPTION OF SYMBOLS 10 Molten metal 11 Molded body of metal glass 20 Receiving mold 21 Cavity mold part 21a Molding cavity 21b Outer surface of cavity mold part 21c Molten metal reservoir part 21d Tapered inner surface 22 Extension part of cavity mold part 25 Cooling base Mold part 25a Water cooling water hole 25b Cooling base mold part inner surface 25c Cooling base mold part central through hole 25d Tapered outer surface 26 Cooling water supply unit 27 Discharge pin 30 Pressing die 31 Pressing surface part 32 Pressing type Extension part 40 Press drive mechanism part 50 Drive mechanism part of cavity mold part 60 High-frequency heating device part 61 Coil for high-frequency heating

Claims (6)

Pressing the molten metal and cooling it faster than the critical cooling rate of crystallization to form a metallic glass molded body, and receiving mold provided with a molding cavity, and said melting into the molding cavity A metal glass molding device comprising a pressing mold that presses a metal and a pressing drive mechanism that moves the pressing mold in the pressing direction,
The receiving mold is constituted by a cavity mold part in which the molding cavity is formed, and a cooling base mold part that promotes cooling of the molten metal by receiving and contacting the cavity mold part,
When cooling the molten metal, the cavity mold part is separated from the cooling base mold part when the raw metal is melted and the molten metal is pressed by the pressing mold. A metal glass molding apparatus comprising: a cavity mold drive mechanism that is reciprocated along the pressing direction of the pressing mold so as to be in contact with each other.   A high-frequency heating coil is provided around the cavity mold part in a state where the cavity mold part is separated from the cooling base mold part, and the raw metal is melted by heating with the high-frequency heating coil. The metal glass molding apparatus according to claim 1, further comprising a high-frequency heating device section provided on the metal glass.   An outer surface of the cavity mold part that contacts the cooling base mold part is provided in a conical shape, and an inner surface of the cooling base mold part that receives and contacts the outer surface of the cavity mold part in a nested manner is provided. 3. The metallic glass molding apparatus according to claim 1, wherein the metallic mold is provided in a conical shape corresponding to the shape of the outer surface of the cavity mold portion.   An outer surface of the cavity mold part that contacts the cooling base mold part is provided in a concavo-convex shape so as to increase a surface area, and the outer surface of the cavity mold part is received in a nested manner to contact the cooling base mold part. The metal glass molding apparatus according to any one of claims 1 to 3, wherein the inner side surface is provided in an uneven shape corresponding to the shape of the outer side surface of the cavity mold part.   An extension portion of the cavity mold portion formed to extend toward the cooling base mold portion side of the cavity mold portion is inserted and arranged in a central through-hole of the cooling base mold portion, and the cavity mold portion is extended. The metal glass molding apparatus according to any one of claims 1 to 4, wherein a drive mechanism section of the cavity mold section is configured such that the cavity mold section is driven through the section.   2. The pressing surface portion that presses at least in contact with the molten metal of the pressing mold is disposed so as to be heated by the high-frequency heating device in at least a heating step related to the molten metal. The metal glass molding apparatus according to claim 5.

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