US20150202684A1 - Method for molding amorphous alloy, and molded object prouduced by said molding method - Google Patents

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

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Publication number
US20150202684A1
US20150202684A1 US14/381,909 US201314381909A US2015202684A1 US 20150202684 A1 US20150202684 A1 US 20150202684A1 US 201314381909 A US201314381909 A US 201314381909A US 2015202684 A1 US2015202684 A1 US 2015202684A1
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United States
Prior art keywords
metallic glass
casting mold
melt
cooling water
molding device
Prior art date
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Abandoned
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US14/381,909
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English (en)
Inventor
Takashi Hashima
Yoichi Inoue
Yasunori Saotome
Kenji Amiya
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HEISHIN TECHNO WERKE Ltd
Tohoku University NUC
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HEISHIN TECHNO WERKE Ltd
Tohoku University NUC
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Assigned to HEISHIN TECHNO WERKE LTD., TOHOKU UNIVERSITY reassignment HEISHIN TECHNO WERKE LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAOTOME, YASUNORI, AMIYA, KENJI, INOUE, YOICHI, HASHIMA, TAKASHI
Publication of US20150202684A1 publication Critical patent/US20150202684A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • B22D25/06—Special casting characterised by the nature of the product by its physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2218—Cooling or heating equipment for dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure

Definitions

  • the present invention relates to a method of molding an amorphous alloy that is excel lent in quality and has a high degree of shape freedom, and to a molded object produced by the molding method. Specifically, the present invention relates so a molding method capable of processing metallic glass while keeping a supercooled state in a casting mold, and to a molded article, such as a rotor of a uniaxial eccentric screw pump, produced by the molding method.
  • metallic glass that is a kind of an amorphous alloy has specific mechanical property that is not inherent in general metals. Specifically, the metallic glass has a low Young's modulus (flexibility) while keeping the mechanical strength due to its high strength and high hardness. Therefore, the metallic glass has been expected to be utilized for various materials, and the application thereof to a bar-shaped member having a small diameter, such as a rotor of a uniaxial eccentric screw pump described later, has been expected.
  • a method of molding an amorphous alloy involves casting a melt into a water-cooled mold.
  • Patent Literature 1 JP 2002-224249 A.
  • an alloy material of an amorphous alloy member is melted by heating with a high-frequency induction heating coil, and the melt is cast into a water-cooled casting mold and quenched in the mold.
  • Patent Literature 1 merely involves pouring the melt into the casting mold, thereby causing the following problems. Specifically, surrounding atmospheric gas is liable to be drawn in, the melt is solidified due to quenching before the drawn-in gas and occluded gas that has occluded the surrounding atmospheric gas during melting are released, and those gases are confined in metallic glass to form pores having various sizes.
  • the pores refer to void parts such as micropores present in a material for the metallic glass and cause significant decrease in mechanical strength of the material in a cast molded object.
  • Patent Literature 2 JP 2006-175508 A discloses a method of molding an amorphous alloy, which involves melting an amorphous alloy, pouring the melt into a casting mold, pressurizing the melt in the casting mold by pressing, and quenching the melt.
  • This molding method has the following advantage. Specifically, the melt in the casting mold is pressurized by pressing and quenched, and hence gas in the melt that causes pores is forcibly discharged to reduce inner pores.
  • the method of molding an amorphous alloy of Patent Literature 2 has the following drawback. Specifically, the method adopts the steps of pouring the melt into the casting mold, pressurizing the melt to eliminate the pores, and quenching the melt. Thus, the melt is annealed and crystallized while being poured into the casting mold when a small molded article is produced, with the result that an amorphous alloy is not formed in some cases. Accordingly, the shape and size of an article to be molded depend on the material for and the amount of the melt, and a molded article has a small degree of work freedom.
  • the present invention has been made so as to solve the above-mentioned problems, and it is an object of the present invention to provide 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 to provide a molded object produced by the molding method.
  • a method of molding an amorphous alloy including: a melting step of melting an alloy; a differential-pressure casting step of injecting a melt of the alloy into a casting mold positioned below the melt and evacuating the casting mold; and a processing step of processing the melt by pressurizing a casting metal in the casting mold under a high-temperature state while keeping the melt in a supercooled state.
  • the melt when the amorphous alloy is molded, the melt is filled into a small casting mold rapidly by evacuating the casting mold while the melt is poured into the casting mold, and pores and the like formed in this case are reduced by pressurizing the melt.
  • the melt can be filled into the casting mold sufficiently in a temperature region falling within a temperature range (supercooling temperature range) that corresponds to an intermediate temperature lower than a crystallization temperature of the metal and higher than a glass transition temperature of the metal.
  • a molded article required to have a small shape or a larger longitudinal length ratio, or to have high fluidity in the melt in the casting mold can be provided with less pores.
  • the “amorphous alloy” as used herein is preferably metallic glass.
  • the metallic glass is a kind of an amorphous alloy and is a metal in which glass transition can be observed clearly.
  • the metallic glass is processed in a state of a supercooled fluid. That is, the metallic glass is processed in a time region in which the formation of a crystal phase does not occur even when the metal temperature decreases, and thereafter, the metallic glass is strongly pressurized with the temperature being kept in the casting mold while the fluidity of the metallic glass is monitored. With this, a metallic glass molded article having a shape without defects in which pores are crushed can be produced in a bulk shape. Accordingly, the effect of mass productivity of molded articles can be expected by optimizing the conditions of the processing step, and cost can be reduced.
  • the casting metal is heated in the processing step by causing a high-frequency current to flow through a coil provided on a periphery of the casting mold.
  • the casting metal is heated, for example, by causing the high-frequency current to flow Through the coil wound around the periphery of the casting mold to conduct heat from the outside to the inside of the casting mold (high-frequency induction heating).
  • This method is advantageous in that the temperature of the melt can be controlled by regulating a coil current, and the temperature can be controlled easily in accordance with a change in the melt and the external atmosphere.
  • the casting metal may be heated by irradiating the casting mold with infrared light or may be heated through use of radiation heat obtained by irradiating the casting mold with infrared light.
  • melt is pressurized in the processing step by pressurizing the melt with gas through a hole formed in the casting mold.
  • the melt can be pressurized uniformly without preparing a mechanical pressurizing device separately as long as gas inflow means to an inlet hole and an output hole of the casting mold, for pressurizing the melt with gas, and air tightness are ensured.
  • melt is pressurized in the processing step by pressurizing the melt with an actuator through a hole formed in the casting mold.
  • a molded article produced by the above-mentioned method of molding an amorphous alloy can be produced in a bulk shape even from the metallic glass with high accuracy.
  • a minute rotor of a uniaxial eccentric screw pump having a shape with a larger longitudinal length ratio can be produced with high mechanical strength and repetition fatigue strength simply by optimizing heating and processing conditions.
  • shaping can be performed while the pores and the like are reduced by pressurizing the melt and the supercooled state is kept in the casting mold, and hence a molded article of an amorphous alloy having various shapes, sizes, and components can be provided easily.
  • FIG. 1( a ) shows a specific heat curve of an amorphous alloy
  • FIG. 1( b ) shows a specific heat curve of metallic glass.
  • FIG. 2 is a transformation diagram of a related-art amorphous alloy and metallic glass.
  • FIG. 3 are schematic views illustrating a molding step for a rotor 1 of a uniaxial eccentric screw pump made of metallic glass in time series.
  • FIG. 4 is a flowchart of the schematic view of FIG. 3 .
  • FIG. 5 describes, while referring to, a specific heat curve of a melt of metallic glass in a casting mold in a processing step (viscous flow processing step) in a method of molding an amorphous alloy of the present invention.
  • FIG. 6 is a partial side view schematically illustrating a state of a molding device for performing the molding method of the present invention, when viewed from a lateral side.
  • FIG. 7( a ) is an enlarged horizontal sectional view of a casting mold in the molding device of FIG. 6
  • FIG. 7( b ) is an enlarged plan view of an injection port in the vicinity of a right end when viewed from above
  • FIG. 7( c ) is a side view of FIG. 7( a ).
  • FIG. 8 is a view illustrating a uniaxial eccentric screw pump.
  • an amorphous alloy in particular, metallic glass to be molded in a method of molding an amorphous alloy of the present invention is described.
  • General metals and alloys have a crystal structure in which atoms are arranged periodically. When melted by heating, the metals and alloys become a liquid to have a structure in which the atoms are packed densely at random. The state not having a periodic structure is called an amorphous state. In general, when the liquid is solidified, the liquid changes to a crystal. However, predetermined alloys form a solid while keeping an amorphous structure when quenched. Such an alloy is called an amorphous alloy. Of The amorphous alloys, an alloy exhibiting glass transition that is one of the features of glass is called metallic glass.
  • FIG. 1( a ) shows a specific heat curve of an amorphous alloy
  • FIG. 1( b ) shows a specific heat curve of metallic glass.
  • the amorphous alloy reaches a crystallization temperature by heating before reaching a glass transition point T g and the crystallization thereof proceeds. Thus, no glass transition is observed.
  • T g glass transition point
  • the amorphous alloy in the case of an amorphous alloy having a resistance to crystallization, which is stable in a supercooled liquid state, that is, stable in an amorphous structure, the amorphous alloy reaches the glass transition point T g prior to a crystallization temperature T x due to an increase in temperature, and the crystallization thereof proceeds when the temperature becomes higher than the glass transition point T g .
  • the amorphous alloy having the glass transition point T g lower than the crystallization temperature T x is called metallic glass, and the general amorphous alloy (T x ⁇ T g ) and the metallic glass (T x >T g ) are discriminated from each other.
  • the dotted line (a) on a left side represents a general amorphous alloy.
  • the general metal is solidified at a melting point. T m or less, and the crystallization thereof proceeds and the work hardening thereof also increases at the glass transition temperature T g or less unless the metal is further quenched.
  • the dotted line (b) on a right side represents metallic glass. The supercooled region of the metallic glass is still large even at the melting point T m or less and can be molded to a bulk product having a thickness to some degree even over a long period of time
  • a melt of metallic glass is injected into a casting mold, and the melt is processed by heating and pressurizing the melt in the casting mold while being kept in a supercooled state.
  • description is made of an exemplary case where a rotor of a uniaxial eccentric screw pump made of metallic glass is an article to be molded by the molding method. Note that, the uniaxial eccentric screw pump and the use example thereof are described later
  • FIG. 3 are schematic views illustrating a molding step for a rotor 1 of a uniaxial eccentric screw pump made of metallic glass in time series.
  • FIG. 4 is a flowchart thereof (specific device configuration example is described later).
  • a columnar standard rod 2 is used as a basic material of a metallic glass material as illustrated in FIG. 3( a ).
  • the standard rod 2 is produced by performing selection and blending of an alloy in consideration of mechanical physical properties.
  • a Pd-based alloy excellent in castability, a low-cost Ni-based alloy excellent in mass productivity, and the like are considered as candidate materials for the rotor 1 .
  • the standard rod 2 is split in an axial direction as illustrated in FIG.
  • the step is herein referred to as a differential-pressure casting step, in which the melt 7 pressurized with gas is injected into the casting mold 4 through an inlet on a left end of the drawing sheet of FIG. 3( c ) (STEP 3 ), and the casting mold 4 is evacuated with a vacuum pump (described later) through an outlet on a right end of the drawing sheet of FIG. 3( c ) (STEP 4 ).
  • a vacuum pump described later
  • the melt 7 is injected into the casting mold 4 through the inlet on the left end in a gap between an upper die 4 - 1 and a lower die 4 - 2 in FIG.
  • the molding method of the present invention additionally includes a viscous flow processing step illustrated in FIG. 3( d ) (STEP 5 ).
  • the melt 7 in the casting mold 4 is heated and pressurized. That is, in the viscous flow processing step, high-temperature control (STEP 6 ) and pressurizing treatment (STEP 7 ) are performed simultaneously in the casting mold 4 .
  • the pressurizing treatment the inlet port and the outlet port of the casting mold 4 are pressurized from both sides as indicated by the arrows F, and in the high-temperature control, the casting mold 4 is heated by supplying a high-frequency coil current from an AC power source to a coil 5 wound around the periphery of the casting mold 4 .
  • the melt 7 in the casting mold 4 is heated from an outer surface of the casting mold 4 by heat conduction, and for example, PID control is adopted as the temperature control.
  • the high-frequency heating is preferred as the high-temperature control (STEP 6 ) because deviation between the coil current and the increase/decrease in temperature is small, it is also considered to use infrared light or radiation heat.
  • the pressurizing treatment (STEP 7 ) is advantageous in that a method of applying a pressure with inert gas can be provided with a simple configuration. Alternatively, a method of directly pressurizing the inlet port and the outlet port of the casting mold 4 through use of an actuator is also considered as the pressurizing treatment.
  • the processing process of the melt 7 in the casting mold 4 in the viscous flow processing is described with reference to a specific heat curve of FIG. 5 .
  • a metallic glass Pd alloy as a material for the molded article (rotor 1 ) is described.
  • the viscous flow processing encompasses processing in a state of a supercooled fluid and refers to processing at a temperature of from the melting point T m to the glass transition point T g .
  • the metallic glass Pd alloy is processed in a time region in which the formation of a crystal phase does not occur even when the metal temperature of the Pd alloy decreases.
  • the metallic glass Pd alloy is then strongly pressurized with the temperature in the casting mold 4 being kept while the fluidity thereof is monitored, pores are crushed and the number thereof is reduced significantly, with the result that a shape without defects can be obtained.
  • the cooling rate has a rate gradient of about 1° C./sec or more in a temperature region of from the crystallization temperature T x of 380° C. to the glass transition point T g of 350° C. after the casting. Accordingly, an amorphous metallic glass is formed.
  • the mass productivity effect of a molded article can be expected and cost can be reduced by setting the optimum conditions of the viscous flow processing.
  • the supercooled state is finished by cooling the melt 7 , and the melt 7 is solidified (STEP 8 ).
  • the cooling treatment is generally performed by cooling the casting mold 4 that contains the melt 7 to the glass transition point T g or less with water (detailed example is described later).
  • the Pd alloy is quenched to 350° C. or less.
  • the casting mold 4 is separated (split) into the upper die 4 - 1 and the lower die 4 - 2 , and the solidified metallic glass 7 is ejected from the casting mold 4 (STEP 9 ).
  • the rotor 1 being a molded article has parting lines formed therein. Therefore, rolling finish is performed as illustrated in FIG. 3( e ) (STEP 10 ).
  • the rolling finish is performed with a rolling die 6 so as to enhance the dimensional accuracy, and herein, description is made of an exemplary case where the rotor 1 is held while an upper rolling die 6 a and a lower rolling die 6 b each having a shape conforming with the shape of the rotor 1 are axially rotated. Further, the rolling die 6 may perform rolling by causing two rotating round dies to hold the rotor 1 . Then, the surface of the rotor 1 subjected to rolling finish as illustrated in FIG. 3( f ) is finally polished by electrolytic polishing or the like (STEP 11 ). In this manner, the rotor 1 is completed.
  • FIGS. 6 to 7 illustrate a specific configuration example of a molding device for metallic glass, which actually carries out the molding method of the present invention described above with reference to FIGS. 3 and 4 .
  • FIG. 6 is a partial side view schematically illustrating a state of the molding device for carrying out the molding method of the present invention, when viewed from a lateral side.
  • FIG. 7 is an enlarged sectional view of the casting mold 4 in the molding device of FIG. 6 , when viewed from a lateral side.
  • the configuration of injecting the melt of metallic glass from above is adopted, and the melt is injected into the casting mold 4 through the injection port 5 a on the upper surface on the right side of the casting mold 4 .
  • a lower end of an injection tube 11 for injecting the melt into the casting mold 4 ascends or descends as indicated by the arrow X, and is connected to the injection port 5 a during injection and distanced from the injection port 5 a during non-injection.
  • the pellet 3 (see FIGS. 3( a ) and 3 ( b )), which is obtained by cutting the standard rod 2 into a portion corresponding to one shot for the casting mold 4 , is arranged in a pellet storage tube 13 , and the pellet 3 is heated with a ceramic heater positioned below the pellet storage tube 13 . In this manner, the metallic glass material is melted. Then, the melt of the metallic glass is injected into the casting mold 4 through the melt injection tube 11 while being pressurized with inert gas from the lower end.
  • the inert gas to be used for pressurization during the injection of the melt is guided from a gas introduction port 14 formed above the pellet storage tube 13 to the lower end of the injection tube 11 .
  • the coil 5 is wound around the periphery of the casting tube 4 , and the casting mold 4 is subjected to heating treatment when a high-frequency current flows through the coil 5 from the. AC power source as described above (see FIG. 3( d ) and STEP 6 of FIG. 4) .
  • the casting mold 4 is supported by a support member 10 .
  • the casting mold 4 and the support member 10 are arranged in a vacuum chamber 15 indicated by the dotted line so that the melt (metallic glass) can spread sufficiently inside the mold when the casting mold 4 is evacuated through a gap of the casting mold 4 , a left-end opening 4 b , and a right-end opening 4 c during the injection of the melt into the casting mold 4 .
  • the melt 7 described above is subjected to the heating treatment and the pressurizing treatment simultaneously in the casting mold 4 (see FIG. 3( d ) and STEP 7 of FIG. 4) , and in the configuration adopted in FIG. 6 , the melt 7 is pressurized by holding the left-end opening 4 b and the right-end opening 4 c from both sides with pressurizing pistons (arranged in side parts denoted by reference numeral 8 ).
  • pressurizing pistons arranged in side parts denoted by reference numeral 8 .
  • a linear slider 9 that reciprocates in a direction of the arrow Y may be used or a dedicated actuator may be provided instead.
  • a method of pressurizing the melt 7 a method of pressurizing the melt 7 with inert gas from the left-end opening 4 b and/or the right-end opening 4 c may be adopted.
  • FIG. 7( a ) a detailed example of the casting mold 4 illustrated in FIG. 6 is described with reference to the side sectional view of FIG. 7( a ).
  • the coil 5 is omitted.
  • a lower end nozzle of the injection tube 11 illustrated only in FIG. 6
  • the melt 7 of metallic glass is injected into The casting mold 4 .
  • the injection port 4 a extends from a deepest part of a receiving portion 4 d that is an elliptical recessed part to a molding gap 4 j in the casting mold 4 .
  • the receiving portion 4 d serves as a guide hole for guiding the lower end nozzle of the injection tube 11 into the injection port 4 a .
  • the melt 7 is pushed into the casting mold 4 while being pressurized with inert gas such as argon gas as described above.
  • the molding gap 4 j extends in an axial direction in the casting mold 4 , and the melt is filled into the casting gap 4 j.
  • a cooling water path through which cooling water flows in the axial direction is arranged on the teriphery of the casting mold 4 , and the water having cooled the casting mold 4 is discharged outside through a cooling water pipe on the left end.
  • a cooling water path 4 g for an upper die which extends in the axial direction, is formed in the upper die 4 - 1 .
  • the cooling water path 4 g for an upper die is connected to a cooling water pipe 4 e for an upper die on the left end of the casting mold 4 , and the cooling water is discharged outside.
  • the cooling water path 4 g for an upper die extends from a left-end vicinity of the casting mold 4 to the right side in the axial direction and returns to the left side in the axial direction when reaching the right-end vicinity of the casting mold 4 to reach the cooling water pipe 4 e for an upper die.
  • FIG. 7( c ) is a left side view of FIG. 7( a ).
  • the cooling water flows into the casting mold 4 through the cooling water pipe 4 e for an upper die on the right side of FIG. 7( c ) and the cooling water is discharged from the cooling water pipe 4 e for an upper die on the left side.
  • the same cooling configuration as that of the upper die 4 - 1 is also arranged in the lower the 4 - 2 .
  • the cooling water path 4 g for an upper die which extends in the axial direction, is formed in the lower die 4 - 2 .
  • the cooling water path 4 h for a lower die is connected to a cooling water pipe 4 f for an upper die on the left end of the casting mold 4 , and the cooling water is discharged outside.
  • the cooling water path 4 h for a lower die extends from the left-end vicinity of the casting mold 4 to the right side in the axial direction and returns to the left end in the axial direction when reaching the right-end vicinity of the casting mold 4 to reach the cooling water pipe 4 f for a lower die in the same way as the above. Note that, both end portions of the casting mold 4 are held by the support member 10 as described with reference to FIG. 6 and the like.
  • a molded article molded through use of the method of molding an amorphous alloy such as metallic glass of the present invention is described.
  • a rotor of a uniaxial eccentric screw pump is exemplified as a molded article.
  • the rotor serving as a metallic glass molded article denoted by reference numeral 130 in FIG. 8
  • a uniaxial eccentric screw pump 100 including the rotor as one component are described.
  • FIG. 8 illustrates the uniaxial eccentric screw pump 100 .
  • the uniaxial eccentric screw pump 100 is mounted, for example, at an arm tip end or the like of an industrial robot, and ejects and applies an appropriate amount of liquid or the like to a desired place from a tip end nozzle 112 a .
  • the uniaxial eccentric screw pump 100 is a so-called rotary displacement pump, and receives a stator 120 , the rotor 130 , a power transmission mechanism 150 , and the like in a casing 112 , as illustrated in FIG. 8 .
  • the casing 112 is a metallic tubular member, and a needle (first opening) 114 a is provided at the nozzle 112 a mounted on one end side in a longitudinal direction.
  • an outer circumferential portion of the casing 112 has an opening (second opening) 114 b .
  • the opening 114 b communicates to an inner space of the casing 112 in an intermediate portion 112 d positioned in an intermediate part in the longitudinal direction of the casing 112 .
  • the needle 114 a and the opening 114 b respectively serve as a suction port and an ejection port of the pump 100 .
  • the uniaxial eccentric screw pump 100 is capable of pumping a fluid so that the needle 114 a serves as the ejection port and the opening 114 b serves as the suction port when the rotor 130 is rotated in a forward direction.
  • the uniaxial eccentric screw pump 100 is capable of pumping a fluid so that the needle 114 a serves as the suction port and the opening 114 b serves as the ejection port when the rotor 130 is rotated in a backward direction.
  • the rotor 130 is operated so that the needle 114 a serves as the ejection port and the opening 114 b serves as the suction port.
  • the stator 120 is a member being formed of an elastic body or a resin typified by a rubber and having a substantially cylindrical external shape.
  • the material for the stator 120 is appropriately selected depending on the kind, characteristics, and the like of a fluid to be conveyed through use of the uniaxial eccentric screw pump 100 .
  • the stator 120 is received in a stator mounting portion 112 b positioned adjacent to the needle 114 a in the casing 112 .
  • An outer diameter of the stator 120 is substantially the same as an inner diameter of the stator mounting portion 112 b .
  • the stator 120 is mounted on the stator mounting portion 112 b in a state in which an outer circumferential surface of the stator 120 is substantially held in close contact with an inner circumferential surface of the stator mounting portion 112 b . Further, one end side of the stator 120 is held by the nozzle 112 a in an end portion of the casing 112 .
  • an inner circumferential surface 124 of the stator 120 has a double threaded multi-stage female screw shape. More specifically, a through-hole 122 extending in the longitudinal direction of the stator 120 and being twisted at the above-mentioned pitch is formed in the stator 120 .
  • the through-hole 122 is formed so that a sectional shape thereof (opening shape) has a substantially elliptical shape even in a cross-section at any position in the longitudinal direction of the stator 120 .
  • An inner diameter D i of the female screw shape portion formed by the inner circumferential surface 124 of the stator 120 is set in a stepwise manner so as to be enlarged at every step proceeding in the longitudinal direction by the length L from the opening 114 b side (right side of FIG. 8 ) serving as the suction port to the needle 114 a side (left side of FIG. 10 ) serving as the ejection port.
  • An outer diameter of the portion formed into the male screw shape of the rotor 130 is set in a stepwise manner so as to be reduced at every step proceeding in the longitudinal direction by the length L from the suction side (right side of FIG. 8 ) to the ejection port side (needle 114 a side (left side of FIG. 8 )).
  • an outer circumferential surface 132 of the rotor 130 and the inner circumferential surface 124 of the stator 120 are brought into close contact with each other at the respective tangents, and a fluid conveyance path 140 is formed between the inner circumferential surface 124 of the stator 120 and the outer circumferential surface of the rotor 130 .
  • the fluid conveyance path 140 serves as a multi-stage (d-stage) flow path with a length that is d times as large as the reference length S of the lead in the axial direction of the stator 120 and the rotor 130 , assuming that the reference length S is the length L of the lead of the stator 120 and the rotor 130 described above. Further, the fluid conveyance path 140 extends in a spiral shape in the longitudinal direction of the stator 120 and the rotor 130 .
  • the fluid conveyance path 140 proceeds in the longitudinal direction of the stator 120 while rotating in the stator 120 when the rotor 130 is rotated in the through-hole 122 of the stator 120 . Therefore, when the rotor 130 is rotated, a fluid can be conveyed sucked into the fluid conveyance path 140 from one end side of the stator 120 , and the fluid can be conveyed to the other end side of the stator 120 while being confined in the fluid conveyance path 140 to be ejected on the other end side of the stator 120 .
  • the pump 110 of this embodiment is capable of pumping the fluid sucked through the opening 114 b to eject the fluid through the needle 114 a , when the rotor 130 is rotated in a forward direction.
  • the power transmission mechanism 150 is provided so as to transmit power from a power source (not shown), such as a motor provided outside of the casing 112 , to the rotor 130 described above.
  • the power transmission mechanism 150 includes a power transmission portion 152 and an eccentric rotation portion 154 .
  • the power transmission portion 152 is provided on one end side in the longitudinal direction of the casing 112 , more specifically, on an opposite side of the nozzle 112 a described above (hereinafter also referred to simply as “base end side”).
  • the power portion 152 includes a drive shaft, and is connected to a driving machine 165 formed of a servo motor and a speed reducer through the drive shaft.
  • the drive shaft can be rotated by operating the driving machine 165 .
  • a shaft seal 161 formed of a Variseal 163 , another mechanical seal, a ground packing, or the like is provided in the vicinity of the power transmission portion 152 , with the result that the fluid to be conveyed is prevented from leaking to the driving machine 165 side.
  • the eccentric rotation portion 154 is a portion for connecting the drive shaft and the rotor 130 to each other so that power can be transmitted.
  • the eccentric rotation portion 154 includes a coupling shaft 162 and two coupling bodies 164 , 166 .
  • the coupling shaft 163 is formed of a coupling rod, a screw rod, or the like, which are publicly known in the related art.
  • the coupling body 164 couples the coupling shaft 162 and the rotor 130 to each other, and the coupling body 166 couples the coupling shaft 162 and a drive shaft 156 to each other.
  • the coupling bodies 164 , 166 are each formed of a universal joint, which is publicly known in the related art and are capable of transmitting a rotation force, which is transmitted through the drive shaft, to the rotor 130 to eccentrically rotate the rotor 130 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Rotary Pumps (AREA)
  • Compressor (AREA)
  • Fuel-Injection Apparatus (AREA)
US14/381,909 2012-02-29 2013-01-30 Method for molding amorphous alloy, and molded object prouduced by said molding method Abandoned US20150202684A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2012-042613 2012-02-29
JP2012042613A JP6417079B2 (ja) 2012-02-29 2012-02-29 金属ガラスの成形装置、及び金属ガラス製棒状部材の成形装置
PCT/JP2013/051998 WO2013129012A1 (ja) 2012-02-29 2013-01-30 非結晶質合金の成型方法および該成型方法で作製した成型物

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US20150202684A1 true US20150202684A1 (en) 2015-07-23

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US14/381,909 Abandoned US20150202684A1 (en) 2012-02-29 2013-01-30 Method for molding amorphous alloy, and molded object prouduced by said molding method

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US (1) US20150202684A1 (zh)
EP (1) EP2821163A4 (zh)
JP (1) JP6417079B2 (zh)
KR (1) KR20140131366A (zh)
CN (1) CN104302424B (zh)
WO (1) WO2013129012A1 (zh)

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CN108339853B (zh) * 2018-01-10 2019-12-03 上海交通大学 一种金属玻璃微米箔及其制备方法

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KR20140131366A (ko) 2014-11-12
EP2821163A1 (en) 2015-01-07
CN104302424A (zh) 2015-01-21
JP6417079B2 (ja) 2018-10-31
JP2013176791A (ja) 2013-09-09
CN104302424B (zh) 2017-03-08
EP2821163A4 (en) 2015-12-30
WO2013129012A1 (ja) 2013-09-06

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