US20160129498A1 - Double casting method and apparatus - Google Patents

Double casting method and apparatus Download PDF

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Publication number
US20160129498A1
US20160129498A1 US14/889,821 US201414889821A US2016129498A1 US 20160129498 A1 US20160129498 A1 US 20160129498A1 US 201414889821 A US201414889821 A US 201414889821A US 2016129498 A1 US2016129498 A1 US 2016129498A1
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United States
Prior art keywords
casting
molten metal
mold
duplex
cavity
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Abandoned
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US14/889,821
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English (en)
Inventor
Jung Wook Ji
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PIM KOREA CO Ltd
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PIM KOREA CO Ltd
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Assigned to PIM KOREA CO., LTD. reassignment PIM KOREA CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JI, JUNG WOOK
Publication of US20160129498A1 publication Critical patent/US20160129498A1/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
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • B22D17/145—Venting means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088—Feeder heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • 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
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2023—Nozzles or shot sleeves
    • 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
    • B22D17/32—Controlling equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill 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
    • B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D39/00—Equipment for supplying molten metal in rations
    • B22D39/06—Equipment for supplying molten metal in rations having means for controlling the amount of molten metal by controlling the pressure above the molten metal

Definitions

  • the present invention relates to a method and apparatus for duplex casting. More particularly, the present invention relates to a method and apparatus for duplex casting which apply decompression casting and gravity casting together to a mold, such that gas pores and bubbles in a product are removed to prevent a casting defect, and a non-fill problem is resolved to easily produce high heat resistant cast steel products.
  • a generally-used metal mold casting method is one of the most fundamental methods of metal molding, and is used to mass-produce products of the same form.
  • scrap, pig iron, alloy iron, or non-ferrous metal raw materials are injected into a furnace, heated and melted, then poured into a mold formed of sand or a metallic material, and cooled and coagulated to manufacture products.
  • the principle is that, after a molten metal is injected into a mold manufactured in a desired shape and formed, a metallic object of the same shape is formed when the molten metal is coagulated.
  • Vacuum casting may be used by performing melting in the atmosphere and casting under a vacuum condition, or processing a molten metal melted in the atmosphere in a vacuum state when receiving the molten metal in a ladle and casting under the vacuum condition or in the atmosphere.
  • this casting method is used in manufacturing products such as stainless steel, heat resistant steel, tool steel, bearing steel, magnetic materials and the like.
  • a countergravity vacuum assisted casting method which is one type of the vacuum casting method, was developed in the 1970s and 1980s by Hitchiner Manufacturing Co. in the U.S. etc., and is a method of rapidly suctioning a molten metal into a mold through a vacuum system by inserting a ceramic tube into the molten metal.
  • Korean Registration Patent Nos. 0947948 and 0801815 are representative patents related to countergravity vacuum assisted casting and vacuum casting apparatuses. However, since the casting method of Hitchiner Manufacturing Co.
  • this technology is a method of producing a product by suctioning a molten metal into a mold using only a vacuum pressure, such that not only small pores but also large holes such as worm holes are formed in a product in some cases due to a rapid flow of molten metal, and many non-fill casting defects are on partial surfaces of a product.
  • a molten metal has to be rapidly filled into a ceramic cell mold using a vacuum pump in Korean Registration Patent No. 0947948, a severe problem of mold damage may occur with a low-strength sand mold, and when a molten metal is filled in a cavity of a mold and a case is rotated at 300 RPM to 600 RPM, dimensions of a product may change due to the molten metal damaging or deforming the mold, and may lead to severe defects in quality, such that a high-price ceramic cell mold has to be used, which is disadvantageous in terms of original cost. Furthermore, since the ceramic cell mold for precision casting does not naturally collapse after the molten metal is solidified, the ceramic cell mold cannot be applied to inner inserted type products such as a turbine housing.
  • the ceramic cell mold is used at temperatures of 900° C. or higher.
  • a long time of 600 seconds or more is required until the molten metal is coagulated due to the high temperature of the mold, the ceramic cell mold has a severe weakness in terms of productivity. If the mold is moved within a shorter time, not only the molten metal in a vertical riser of Korean Registration Patent No. 0947948, but also uncoagulated molten metal in a product connected to a gate may exit from a source and lead to severe quality problems.
  • centrifugal force is used to rotate the case until the product is completely solidified in order to attempt an improvement in productivity.
  • a long time of 300 seconds or more is still required until the product is completely solidified.
  • the present inventors have repeated studies on casting methods for overcoming the above problems, and produced a high-temperature heat resistant steel stainless steel product by applying a duplex casting technology which removes a vacuum pressure in a sand mold, instead of ceramic precision casting mold, to refill a molten metal which is suctioned but not yet coagulated by gravity, thus completing the present invention.
  • An aspect of the present invention is to provide a duplex casting method which is capable of preventing shrinkage defects, bubble defects, and other casting defects when casting a product.
  • Another aspect of the present invention is to provide a duplex casting method through which inclusions included in a molten metal may be easily removed.
  • Still another aspect of the present invention is to provide a duplex casting method in which a degree of precision is excellent, and manufacturing a product of a complex shape is possible.
  • Yet another aspect of the present invention is to provide a duplex casting method capable of saving on costs and improving productivity.
  • Yet another aspect of the present invention is to provide a duplex casting apparatus.
  • the duplex casting apparatus includes a casting chamber in which a space portion is formed; an injection tube mounted below the casting chamber and into which a molten metal is injected; a mold detachably connected to the injection tube and having a cavity; a filling medium filled between an inner portion of the casting chamber and the mold; and a pressure regulating means disposed above the casting chamber and decompressing the inner portion of the casting chamber.
  • a riser accommodating the molten metal by coming in communication with an upper portion of the cavity in the mold and discharging the molten metal to the cavity may be further included.
  • the riser may be formed in a size of about 30 volume % to about 120 volume % of the mold.
  • a melting furnace for melting a raw material to form a molten metal may be further included.
  • an inner diameter of the injection tube may be larger than an inner diameter of an inlet of the cavity.
  • a ratio of the inner diameter of the cavity to the inner diameter of the injection tube may be about 1:1.1 to about 1:3.
  • the pressure regulating means may include a suction screen, a vacuum pump, and a suction tube.
  • the duplex casting method includes decompressing the casting chamber into which the filling medium is filled by the pressure regulation means and performing first injection of a molten metal into the cavity inside the mold along the injection tube by the pressure difference with the outside; and undoing the decompression of the casting chamber before the molten metal of the first injection into the cavity is coagulated and performing second injection of the molten metal by gravity.
  • the molten metal may also be injected into the riser formed to come in communication with the upper portion of the cavity in the mold during the first injection, and the molten metal injected into the riser may be discharged by gravity and the second injection into the cavity may be performed when the decompression of the casting chamber is undone.
  • the method may include inserting the mold into the casting chamber on which the injection tube is mounted to be coupled to the injection tube, and performing the first injection of the molten metal by decompression after filling the inner portion of the casting chamber with the filling medium.
  • a decompression rate of the casting chamber may be regulated to regulate a speed at which the molten metal is injected into the mold.
  • the injection tube, the pressure regulation means, and the filling medium may be reused.
  • shrinkage defects and bubble defects may be prevented, inclusions included in a molten metal may be easily removed to prevent casting defects, a degree of precision may be excellent, manufacturing a product of a complex shape may be possible, and reusing an inlet, a pressure regulation means, a filling medium, and the like may be possible, thereby enabling costs to be saved and productivity to be improved.
  • FIG. 1 illustrates a cross-section of a duplex casting apparatus according to one embodiment of the present invention.
  • FIG. 2( a ) illustrates a cross-section of an injection tube according to one embodiment of the present invention
  • FIG. 2( b ) illustrates a cross-section of an injection tube according to another embodiment of the present invention.
  • FIG. 3 illustrates a duplex casting apparatus according to another embodiment of the present invention.
  • An aspect of the present invention relates to a duplex casting apparatus.
  • FIG. 1 illustrates a cross-section of a duplex casting apparatus according to one embodiment of the present invention.
  • a duplex casting apparatus 100 includes a casting chamber 10 in which a space portion is formed; an injection tube 20 mounted below the casting chamber 10 and into which a molten metal is injected; a mold 30 detachably connected to the injection tube 20 and having a cavity 35 ; a filling medium 40 filled between an inner portion of the casting chamber 10 and the mold 30 ; and a pressure regulation means 60 disposed above the casting chamber 10 and decompressing the inner portion of the casting chamber 10 .
  • a space portion may be formed in the casting chamber 10 to enable the filling medium 40 to be filled and fix the mold 30 , and the casting chamber 10 may be decompressed by the pressure regulation means 60 to a pressure equal to or less than atmospheric pressure to provide a decompressed atmosphere in the mold 30 .
  • the injection tube 20 is dipped into the casting chamber 10 , mounted below the casting chamber 10 , and fixed, and a portion of the injection tube 20 protrudes and is dipped in the molten metal to inject the molten metal into the mold 30 .
  • a plurality of injection tubes 20 may also be installed at the casting chamber 10 in other embodiments.
  • the injection tube 20 formed of a common material may be used.
  • the injection tube 20 may be formed of a fireproof material such as a ceramic that may prevent a reaction when coming in contact with the molten metal, but the material is not limited thereto.
  • an inner diameter d 1 of the injection tube 20 may be larger than an inner diameter d 2 of the cavity 35 in the present invention.
  • a time for which the molten metal stays may be increased even when the decompression is undone.
  • a ratio of the inner diameter d 2 of the cavity 35 to the inner diameter d 1 of the injection tube 20 (d 2 :d 1 ) may be about 1:1.1 to about 1:3.
  • the ratio may be about 1:1.5 to about 1:2.5. More preferably, the ratio may be about 1:2.
  • the time for which the molten metal stays may be increased even when the decompression of the casting chamber 10 is undone.
  • FIG. 2( a ) illustrates a cross-section of the injection tube 20 according to one embodiment of the present invention
  • FIG. 2( b ) illustrates a cross-section of an injection tube 21 according to another embodiment of the present invention.
  • a portion coming in contact with a floor surface of the casting chamber may be wide and gradually narrowed upward.
  • the mold 30 is detachably connected to the injection tube 20 , and may have the cavity 35 of a desired product shape.
  • the mold 30 formed of a common material may be used.
  • a sand mold may be used as the mold 30 .
  • the mold 30 may be used after being manufactured by obtaining mixed sand which includes sand, a water-soluble phenolic resin, and an ester based curing agent, and inserting the mixed sand into a mold, but the material is not limited thereto.
  • Common sand may be used as the sand.
  • silica sand, zircon sand, chromite sand, olivine sand, or alumina sand may be used.
  • the sand having a diameter of about 0.05 mm to about 1 mm may be used.
  • a plurality of molds 30 may be installed in the casting chamber 10 .
  • one to nine molds 30 may be installed, such that the cost may be saved and the productivity may be improved through efficient space utilization.
  • the sand mold naturally collapses. Consequently, the cost saving effect is improved because the mold 30 and the ceramic injection tube 20 are naturally separated such that the injection tube 20 attached to the case is reusable, and the productivity improving effect is improved because the injection tube 20 is fixed to the casting chamber 10 as illustrated in FIG. 1 and the mold 30 may be continuously replaced by itself.
  • the filling medium 40 may be filled in the casting chamber 10 and around the mold 30 to support the mold 30 .
  • the filling medium 40 formed of a common material may be used.
  • fireproof particles such as mixed sand or sand may be used, but the material is not limited thereto.
  • the filling medium 40 may be filled while applying vibration to the casting chamber 10 for a predetermined amount of time, thereby enabling the filling medium 40 to be uniformly filled while increasing the filling density.
  • the duplex casting apparatus 100 may further include a riser 50 accommodating the molten metal by coming in communication with an upper portion of the cavity 35 in the mold 30 and discharging the molten metal to the cavity by gravity.
  • the riser 50 may be included to prevent inclusions from being included in a product or casting defects such as bubbles when the mold 30 is coagulated.
  • the riser 50 may be disposed above the cavity 35 .
  • a bottom surface of the riser 50 may be disposed above a top surface of the cavity 35 .
  • an interval between the bottom surface of the riser 50 and the top surface of the cavity 35 may be about 1 cm to about 100 cm.
  • the riser 50 may be formed in a size of about 30 volume % to about 120 volume % of the mold 30 . In one embodiment, the riser 50 may be formed in a size of about 50 volume % to about 80 volume % of the mold 30 .
  • Inclusions included in the molten metal may be easily removed in the above ranges, and the bubbles and the air remaining in the mold 30 may be easily removed.
  • the pressure regulation means 60 may be disposed above the casting chamber 10 , and may regulate a pressure in the casting chamber 10 to decompress the casting chamber 10 .
  • the pressure regulation means 60 may include a suction screen 64 , a vacuum pump (not shown), and a suction tube 62 .
  • the suction screen 64 is connected to an upper portion of the casting chamber 10
  • the suction tube 62 is connected to one surface of the suction screen 64
  • the suction tube 62 may come in contact with the vacuum pump (not shown) to regulate the pressure in the casting chamber 10 by operating the vacuum pump.
  • the suction screen 64 may play a role of passing only gas through the suction tube 62 and preventing suction of the filling medium 40 .
  • the vacuum pump may regulate the pressure of the casting chamber 10 to remove gas inside the mold 30 and regulate a speed at which the molten metal is injected.
  • a common vacuum pump may be used as the vacuum pump.
  • an ionic pump, a diffusionic pump, and the like may be used, but the type of the pump is not limited thereto.
  • the suction tube 62 may discharge gas in the casting chamber 10 to decompress the pressure in the casting chamber 10 .
  • a speed of decompressing the inner pressure of the casting chamber 10 may be regulated to regulate a speed at which the molten metal is injected.
  • FIG. 3 illustrates a duplex casting apparatus 100 according to another embodiment of the present invention.
  • the duplex casting apparatus 100 may further include a melting furnace 70 for melting a raw material to form a molten metal.
  • the melting furnace 70 may be disposed at a lower portion of the duplex casting apparatus 100 and the injection tube 20 of the duplex casting apparatus 100 may be dipped in the molten metal in the melting furnace 70 to inject the molten metal by the decompression of the casting chamber 10 .
  • the injection tube 20 may be dipped in the molten metal formed in the melting furnace 70 in a depth of about 3 cm to about 10 cm. Under the above condition, outside air is maximally prevented from being introduced into the molten metal to prevent casting defects, and the speed at which the molten metal is injected may be regulated.
  • a common furnace may be used as the melting furnace 70 .
  • an electric furnace including a coil type heating unit such as tungsten and Kanthal may be used to heat a raw material accommodated therein and form the molten metal.
  • the duplex casting method may include decompressing the casting chamber 10 to perform first injection of the molten metal into the cavity 35 ; and undoing the decompression to perform second injection of the molten metal.
  • the duplex casting method may include decompressing the casting chamber 10 into which the filling medium 40 is filled by the pressure regulation means 60 and performing the first injection of the molten metal into the cavity 35 inside the mold 30 along the injection tube 20 by the pressure difference with the outside; and undoing the decompression of the casting chamber 10 before the molten metal of the first injection into the cavity 35 is coagulated, performing the second injection of the molten metal by gravity, and disassembling the casting chamber to separate the mold.
  • the duplex casting method may include inserting the mold 30 into the casting chamber 10 on which the injection tube 20 is mounted to be coupled to the injection tube 20 , and performing the first injection of the molten metal by decompression through the pressure regulation means after filling the inner portion of the casting chamber 10 with the filling medium 40 .
  • This step is a step of melting a raw material accommodated in the melting furnace 70 to form a molten metal.
  • An electric furnace may be used as the melting furnace 70 , and a heating coil included in the electric furnace may be used to heat and melt the raw material, but embodiments are not limited thereto.
  • This step is a step of filling the filling medium 40 between the casting chamber 10 and the mold 30 , then decompressing the inner pressure of the casting chamber 10 through the pressure regulation means 60 .
  • the decompressed pressure may be regulated to about 10 ⁇ 2 torr to about 10 ⁇ 5 torr. Under the above condition, a speed at which the molten metal is injected may be easily regulated, and casting defects may be prevented.
  • the first injection of the molten metal into the cavity 35 is performed in the mold 30 along the injection tube 20 by a pressure difference between the casting chamber 10 and the outside.
  • the injection tube 20 may be dipped in the molten metal formed in the melting furnace 70 in a depth of about 3 cm to about 10 cm, and the molten metal may be injected. Under the above condition, outside air is maximally prevented from being introduced into the molten metal to prevent casting defects, and the speed at which the molten metal is injected may be easily regulated.
  • a decompression rate of the casting chamber 10 may be regulated to regulate a speed in which the molten metal is injected into the mold 30 .
  • the decompression rate applied by the pressure regulation means 60 may be regulated to regulate the speed at which the molten metal is injected.
  • the decompression rate may be regulated to about 0.1 cm/s to about 30 cm/s.
  • the casting chamber 10 may be regulated to also regulate a speed at which the molten metal is injected into the riser 50 formed to come in communication with the upper portion of the cavity 35 during the first injection.
  • This step is a step of undoing the decompression of the casting chamber 10 before the molten metal of the first injection into the cavity 35 is coagulated to perform the second injection of the molten metal by gravity.
  • the first injection of the molten metal is a motion from bottom to top, while the second injection of the molten metal is a motion from top to bottom.
  • the molten metal of the first injection into the cavity 35 begins directional coagulation from an outside of the cavity 35 . Consequently, inclusions (or impurities) with a relatively low density may be coagulated on a surface of the cavity 35 and easily removed. In addition, pores and air bubbles formed at the cavity 35 during the second injection of the molten metal may be easily removed.
  • the molten metal injected into the riser 50 may be discharged by gravity when the decompression of the casting chamber 10 is undone and the second injection into the cavity 35 may be performed.
  • the pores and bubbles formed at the cavity 35 may be easily removed when the second injection into the mold 30 is performed on the molten metal injected into the riser 50 by gravity.
  • This step is a step of disassembling the casting chamber 10 after the second injection of the molten metal and obtaining a product formed in the mold 30 .
  • FIG. 3 illustrates the duplex casting apparatus 100 according to another embodiment of the present invention.
  • the injection tube 20 , the pressure regulation means 60 , and the filling medium 40 are easily detachable from a casting chamber 10 a.
  • the casting chamber 10 a may be separated and disassembled, and the injection tube 20 , the pressure regulation means 60 , and the filling medium 40 may be mounted on another casting chamber 10 b and reused, thereby having a cost saving effect.
  • the injection tube 20 formed of a ceramic material which had a shape illustrated in FIG. 2( a ) and was 200 mm long was installed at a bottom portion of the casting chamber 10 of a cylindrical shape which had a diameter of 600 mm and a height of 800 mm.
  • the mold 30 having the cavity 35 was manufactured using mixed sand manufactured to include sand, water-soluble phenolic resin, and an ester based curing agent, and the mold 30 was overlaid on an inlet of the injection tube 20 and disposed in the casting chamber 10 .
  • the injection tube with an inner diameter d 1 of ⁇ 50 mm and the cavity with an inner diameter d 2 of an inlet of ⁇ 25 mm were used.
  • the riser 50 coming in communication with an upper portion of the cavity 35 was mounted on the mold 30 .
  • the riser 50 was formed to have a size of 65 volume % of an overall volume of the mold 30 .
  • the mold 30 formed as illustrated in FIG. 1 was overlaid on the injection tube 20 to prevent a gap from being formed.
  • the filling medium 40 was filled between the casting chamber 10 and the mold 30 while vibration was applied thereto.
  • the melting furnace (electric furnace) 70 which included a tungsten coil type heating unit was prepared, and a raw material was inserted thereinto and heated to manufacture a molten metal.
  • the pressure regulation means 60 which included the suction screen 60 , the suction tube 62 , and the vacuum pump (not shown) was mounted on the casting chamber 10 , and the vacuum pump (not shown) was operated to maintain the inner portion of the casting chamber 10 in a vacuum state of 10 ⁇ 3 torr.
  • the ceramic injection tube 20 was dipped in the molten metal manufactured in the electric furnace at a depth of 50 mm, and the first injection of the molten metal into the injection tube 20 was performed to inject the molten metal up to the mold 30 and the riser 50 .
  • the vacuum pump was turned off after 90 seconds, and before the molten metal of the first injection was coagulated, the second injection of the molten metal injected up to the riser 50 into the cavity 35 was performed by gravity.
  • the casting chamber 10 was moved after 120 seconds to be positioned on a disassembling conveyor, and a product formed in the cavity 35 in the mold 30 was obtained.
  • casting defects such as bubbles, worm holes, non-filled portions etc. were not found in the obtained product.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
US14/889,821 2013-05-08 2014-05-07 Double casting method and apparatus Abandoned US20160129498A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020130052062A KR101367200B1 (ko) 2013-05-08 2013-05-08 이중 주조 방법 및 장치
KR10-2013-0052062 2013-05-08
PCT/KR2014/004016 WO2014182045A1 (ko) 2013-05-08 2014-05-07 이중 주조 방법 및 장치

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US20160129498A1 true US20160129498A1 (en) 2016-05-12

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US14/889,821 Abandoned US20160129498A1 (en) 2013-05-08 2014-05-07 Double casting method and apparatus

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US (1) US20160129498A1 (ja)
JP (1) JP6117992B2 (ja)
KR (1) KR101367200B1 (ja)
CN (1) CN105492143A (ja)
DE (1) DE112014002341T5 (ja)
WO (1) WO2014182045A1 (ja)

Cited By (2)

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CN113369442A (zh) * 2021-05-25 2021-09-10 庆铃汽车（集团）有限公司 用于铸件内部缺陷改善的注射冒口及冒口装置
US11498121B2 (en) 2019-03-14 2022-11-15 General Electric Company Multiple materials and microstructures in cast alloys

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