Method for molding amorphous alloy, and molded object prouduced by said molding method

Abstract

Provided are a method of molding an amorphous alloy, which has a high degree of work freedom regardless of components of an amorphous alloy, in particular, metallic glass and of the shape of an article to be molded, and is capable of producing a molded article having less pores, and a molded object produced by the molding method. The method of molding an amorphous alloy includes: a melting step of melting an amorphous alloy; a differential-pressure casting step of injecting a melt of the amorphous alloy into a casting mold positioned below the melt and evacuating the casting mold; and a processing step of processing the melt by heating and pressurizing the melt in the casting mold while keeping the melt in a supercooled state.

1 - 8 . (canceled) 
     
     
         9 . A molding device for metallic glass, comprising:
 a casting mold into which a melt of metallic glass is to be injected;   an injection tube for injecting the melt of the metallic glass into the casting mold; and   holding means for holding the melt of the metallic glass from both sides in an axial direction of the casting mold,   wherein the casting mold has a molding gap into which the melt of the metallic glass is to be filled, the molding gap being formed in the casting mold so as to extend in the axial direction of the casting mold,   wherein, under a state in which the melt of the metallic glass is injected into the casting mold, the melt of the metallic glass injected into the casting mold is pressurized by the holding means, and   wherein a temperature of the melt of the metallic glass injected into the casting mold is dropped within a temperature range corresponding to an intermediate temperature lower than a crystallization temperature of metal and higher than a glass transition temperature of the metal.   
     
     
         10 . A molding device for metallic glass according to  claim 9 , further comprising a cooling water path arranged on a periphery of the casting mold so that cooling water is caused to flow through the cooling water path in the axial direction of the casting mold,
 wherein the cooling water is caused to flow through the cooling water path, to thereby drop the temperature of the melt of the metallic glass injected into the casting mold within the temperature range corresponding to the intermediate temperature lower than the crystallization temperature of the metal and higher than the glass transition temperature of the metal.   
     
     
         11 . A molding device for metallic glass according to  claim 9 , further comprising:
 a storage tube in which a metallic glass material is to be arranged; and   a heater,   wherein the metallic glass material arranged in the storage tube is melted by heating with the heater into the melt of the metallic glass so as to be injected into the casting mold.   
     
     
         12 . A molding device for metallic glass according to  claim 9 , further comprising:
 a storage tube in which a metallic glass material is to be arranged;   a heater; and   a cooling water path arranged on a periphery of the casting mold so that cooling water is caused to flow through the cooling water path in the axial direction of the casting mold,   wherein the metallic glass material arranged in the storage tube is melted by heating with the heater into the melt of the metallic glass so as to be injected into the casting mold, and   wherein the cooling water is caused to flow through the cooling water path, to thereby drop the temperature of the melt of the metallic glass injected into the casting mold within the temperature range corresponding to the intermediate temperature lower than the crystallization temperature of the metal and higher than the glass transition temperature of the metal.   
     
     
         13 . A molding device for metallic glass according to  claim 9 , wherein the holding means comprises inert gas. 
     
     
         14 . A molding device for metallic glass according to  claim 9 , wherein the holding means comprises a piston. 
     
     
         15 . A molding device for metallic glass according to  claim 12 , wherein the storage tube is configured to store a pellet obtained by splitting a columnar metallic glass material. 
     
     
         16 . A molding device for metallic glass according to  claim 9 , further comprising an injection port through which the melt of the metallic glass is to be injected into the casting mold,
 wherein the injection tube is connected to the injection port during injection of the melt of the metallic glass, and   wherein the injection tube is distanced from the injection port during non-injection of the melt of the metallic glass.   
     
     
         17 . A molding device for metallic glass according to  claim 9 , further comprising a receiving portion having a guide hole for guiding a lower end nozzle of the injection tube into an injection port. 
     
     
         18 . A molding device for metallic glass according to  claim 9 , further comprising a rolling die for performing rolling finish. 
     
     
         19 . A molding device for metallic glass according to  claim 9 , wherein the molding device is configured to mold a rotor of a uniaxial eccentric screw pump as a bar-shaped member made of the metallic glass, the uniaxial eccentric screw pump comprising:
 a stator having a through-hole with a female screw shape;   the rotor with a male screw shape; and   a fluid conveyance path formed by inserting the rotor into the through-hole,   the uniaxial eccentric screw pump being configured to suck a fluid from one end side of the stator and eject the fluid from another end side thereof through eccentric rotation of the rotor in the through-hole.   
     
     
         20 . A molding device for a bar-shaped member made of metallic glass, the molding device comprising:
 a casting mold into which a melt of the metallic glass is to be injected;   an injection tube for injecting the melt of the metallic glass into the casting mold; and   a cooling water path arranged so that cooling water is caused to flow through the cooling water path in an axial direction of the casting mold,   wherein the casting mold has a molding gap into which the melt of the metallic glass is to be filled, the molding gap being formed in the casting mold so as to extend in the axial direction of the casting mold,   wherein, under a state in which the melt of the metallic glass is injected into the casting mold while being pressurized, the melt of the metallic glass injected into the casting mold is pressurized, and   wherein the cooling water is caused to flow through the cooling water path, to thereby drop a temperature of the melt of the metallic glass injected into the casting mold within a temperature range corresponding to an intermediate temperature lower than a crystallization temperature of metal and higher than a glass transition temperature of the metal.   
     
     
         21 . A molding device for a bar-shaped member made of metallic glass according to  claim 20 , wherein the melt of the metallic glass is injected into the casting mold while being pressurized with inert gas. 
     
     
         22 . A molding device for a bar-shaped member made of metallic glass according to  claim 20 , further comprising:
 a storage tube in which a metallic glass material is to be arranged; and   a heater,   wherein the metallic glass material arranged in the storage tube is melted by heating with the heater into the melt of the metallic glass so as to be injected into the casting mold.   
     
     
         23 . A molding device for a bar-shaped member made of metallic glass according to  claim 20 , further comprising:
 a storage tube in which a metallic glass material is to be arranged; and   a heater,   wherein the cooling water path is arranged on a periphery of the casting mold so that the cooling water is caused to flow through the cooling water path in the axial direction of the casting mold,   wherein the metallic glass material arranged in the storage tube is melted by heating with the heater into the melt of the metallic glass so as to be injected into the casting mold, and   wherein the cooling water is caused to flow through the cooling water path, to thereby drop the temperature of the melt of the metallic glass injected into the casting mold within the temperature range corresponding to the intermediate temperature lower than the crystallization temperature of the metal and higher than the glass transition temperature of the metal.   
     
     
         24 . A molding device for a bar-shaped member made of metallic glass according to  claim 22 , wherein the storage tube is configured to store a pellet obtained by splitting a columnar metallic glass material. 
     
     
         25 . A molding device for a bar-shaped member made of metallic glass according to  claim 20 , further comprising an injection port through which the melt of the metallic glass is to be injected into the casting mold,
 wherein the injection tube is connected to the injection port during injection of the melt of the metallic glass, and   wherein the injection tube is distanced from the injection port during non-injection of the melt of the metallic glass.   
     
     
         26 . A molding device for a bar-shaped member made of metallic glass according to  claim 20 , further comprising a receiving portion having a guide hole for guiding a lower end nozzle of the injection tube into an injection port. 
     
     
         27 . A molding device for a bar-shaped member made of metallic glass according to  claim 20 , further comprising a rolling die for performing rolling finish. 
     
     
         28 . A molding device for a bar-shaped member made of metallic glass according to  claim 20 , wherein the molding device is configured to mold a rotor of a uniaxial eccentric screw pump as the bar-shaped member made of the metallic glass, the uniaxial eccentric screw pump comprising:
 a stator having a through-hole with a female screw shape;   the rotor with a male screw shape; and   a fluid conveyance path formed by inserting the rotor into the through-hole,   the uniaxial eccentric screw pump being configured to suck a fluid from one end side of the stator and eject the fluid from another end side thereof through eccentric rotation of the rotor in the through-hole.