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WO2024262667A1 - Appareil de filtration pour équipement de coulée sous pression différentielle - Google Patents

Appareil de filtration pour équipement de coulée sous pression différentielle Download PDF

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Publication number
WO2024262667A1
WO2024262667A1 PCT/KR2023/008580 KR2023008580W WO2024262667A1 WO 2024262667 A1 WO2024262667 A1 WO 2024262667A1 KR 2023008580 W KR2023008580 W KR 2023008580W WO 2024262667 A1 WO2024262667 A1 WO 2024262667A1
Authority
WO
WIPO (PCT)
Prior art keywords
mold
gas
differential pressure
molten metal
circulation line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/KR2023/008580
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English (en)
Korean (ko)
Inventor
권진국
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jinyang Machinary Co ltd
Original Assignee
Jinyang Machinary Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jinyang Machinary Co ltd filed Critical Jinyang Machinary Co ltd
Priority to PCT/KR2023/008580 priority Critical patent/WO2024262667A1/fr
Publication of WO2024262667A1 publication Critical patent/WO2024262667A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D9/00—Machines or plants for casting ingots

Definitions

  • the present disclosure relates to a filtering device for a pressure casting facility.
  • differential pressure casting equipment has been widely used in casting aluminum wheels for automobiles, cylinder heads for engines, housings, etc.
  • a differential pressure casting device may include a holding furnace for receiving molten metal, a mold positioned above the holding furnace and connected to the holding furnace through a stock, and a pressure section for applying pressure to the holding furnace and the mold to fill the molten metal into the mold by differential pressure.
  • the molten metal is filled inside the mold.
  • the occurrence of turbulence can be minimized.
  • the molten metal is solidified by maintaining the pressure for a certain period of time.
  • the pressure is removed, the mold is opened, and the casting is separated, thereby completing the product casting.
  • the unsolidified molten metal on the stock side can be recovered to the holding furnace.
  • the height of the melt surface in the holding furnace is lowered by the molten metal used, and the pressure can be corrected to the corresponding pressurization conditions when casting the next product.
  • the core provided within the mold is formed into a desired shape by mixing bonds or additives with sand for casting, but when these bonds or additives burn due to high temperature, foreign substances such as dust and gas are generated.
  • This project is to provide a filtering device for a differential pressure casting facility that can effectively remove foreign substances generated in a mold during casting.
  • the present invention relates to a filtering device for a differential pressure casting facility capable of removing foreign substances while maintaining pressure within a mold and preventing pressure loss.
  • the differential pressure casting equipment of the present embodiment may include a base plate forming a floor, a vertical shaft installed vertically on the base plate, a fixed plate installed on the upper portion of the vertical shaft to support the vertical shaft, a work table installed so as to be able to slide up and down along the vertical shaft and having a lower die installed on the upper portion, a movable plate disposed on the upper portion of the work table to slide up and down along the vertical shaft and having an upper die installed on the lower portion, a vertical driving unit installed on the fixed plate and connected to the movable plate to move the movable plate up and down, a holding furnace disposed on the base plate and connected to the work table to supply molten metal to a mold, a stock connected between the holding furnace and the mold to supply molten metal from the holding furnace to the mold, a pressure unit that applies differential pressure to the holding furnace and the mold to inject molten metal into the mold, and a filtering unit connected to the mold to remove foreign substances generated in the mold.
  • the above pressure casting equipment may further include a clamping unit that selectively connects the movable plate and the work table to raise the work table when moving to the heating furnace.
  • It may further include an ejection unit installed on the above movable plate to separate the casting from the mold.
  • the above vertical driving unit may include a vertical cylinder that is installed vertically on a fixed plate and connected to the movable plate to move a work table connected to the movable plate up and down.
  • the above pressure unit may include a pressurized gas storage tank for applying gas pressure to a surface of the molten metal, an injection line for injecting the pressurized gas of the storage tank into the mold and the interior of the heating furnace, a pressure regulator installed in each of the injection lines, and a control unit for controlling the pressure regulator to control the gas pressure inside the mold and the heating furnace.
  • the above mold is provided on the work table and may include a lower mold connected to the stock and an upper mold positioned above the lower mold.
  • the above mold can form a plurality of cavities between the lower mold and the upper mold and the lower mold, including a side mold arranged on the side of the lower mold.
  • the above casting device may have a plurality of stocks, and an injection port connected to each cavity and through which molten metal is injected may be structured to be connected to at least one stock to receive the molten metal.
  • the above filtering unit may include a circulation line branched from the exhaust line of the mold and connected to the inside of the mold to circulate gas inside the mold, a circulation valve installed in the circulation line to selectively open and close the circulation line according to a signal from the control unit, and a filter unit connected to one side of the circulation line to remove foreign substances from gas moving along the circulation line.
  • An exhaust valve that selectively opens and closes the exhaust line is installed in the above exhaust line, and the purification line may have a structure that is connected to the exhaust line at a position between the exhaust valve and the mold.
  • the above filtering part may further include a check valve installed between the filtering part and the mold to block reverse flow of gas to the circulation line.
  • the above filtering unit may further include a gas transfer pump installed on one side of the circulation line to induce the flow of gas inside the mold into the circulation line.
  • the above filter unit may include a housing having an inlet and an outlet through which gas passes, and plates arranged in a zigzag shape staggered inside the housing to reduce the flow speed of the gas and separate foreign substances from the gas.
  • the above filter unit may further include a filter membrane arranged at the rear end of the grid plate to filter out foreign substances contained in the gas.
  • foreign substances can be removed by discharging the gas inside the mold while maintaining the internal pressure of the mold. Accordingly, the differential pressure casting process can be properly performed while preventing pressure loss and removing only foreign substances generated inside the mold.
  • FIG. 1 is a schematic drawing of a differential pressure casting facility according to the present embodiment.
  • FIG. 2 is a schematic drawing showing a filtering device of a differential pressure casting facility according to the present embodiment.
  • FIG. 3 is a schematic cross-sectional view illustrating a filter section of a filtering device according to the present embodiment.
  • This device can be applied to all casting facilities having a structure that applies and maintains a certain pressure inside a mold in addition to a differential pressure casting facility.
  • Figure 1 schematically illustrates a differential pressure casting facility equipped with a cooling device according to the present embodiment.
  • the differential pressure casting facility (100) includes a frame structure including a base plate (110) forming a floor, a vertical shaft (112) installed vertically on the base plate (110), a fixed plate (114) installed on the top of the vertical shaft (112) to support the vertical shaft (112), a work table (120) installed so as to be able to slide up and down along the vertical shaft (112) and having a lower die (152) installed on the top, a movable plate (130) positioned on the top of the work table (120) to slide up and down along the vertical shaft (112) and having an upper die (154) installed on the bottom, a vertical drive unit (140) installed on the fixed plate (114) and connected to the movable plate (130) to move the movable plate (130) up and down, an ejection unit (160) installed on the movable plate (130) to separate a casting from a mold (150), It may include a heating furnace (180) arranged on a base plate (110) and connected to a
  • the mold (150) is for forming a casting by introducing molten metal, and may include a lower mold (152) and an upper mold (154) arranged vertically.
  • the mold (150) may further include a side mold arranged laterally.
  • a cavity which is a space according to the shape of the casting, is formed inside.
  • the molten metal is injected into the cavity and formed into a casting.
  • a core (not shown) may be further provided inside the mold (150) depending on the shape of the casting.
  • mold (150) may refer to all of the upper and lower molds, side molds, and cores, or may mean a cavity, which is a space into which molten metal is injected.
  • the lower die (152) may be installed on the upper part of the work table (120) and connected to the heat-insulating furnace (180) through the stock (172).
  • An injection port into which molten metal is injected may be formed on one side of the lower die (152).
  • the molten metal may be supplied into the mold (150) through the stock (172) and the connecting pipe (170).
  • a side mold and a horizontal cylinder (156) for horizontally moving the side mold may be further provided on the side of the work table (120).
  • the side mold is arranged on the side of the lower mold, and may be divided into a plurality of parts and arranged along the circumference of the lower mold.
  • the side mold is connected to the horizontal cylinder (156), and may be moved horizontally according to the operation of the horizontal cylinder (156) and may be engaged with the side between the upper mold and the lower mold.
  • the upper mold (154) can be installed at the bottom of the movable plate (130).
  • the movable plate (130) is moved up and down by the vertical driving unit (140).
  • the upper mold (154) installed on the movable plate (130) is engaged with or separated from the lower mold (152).
  • the mold (150) may further be provided with an inert gas supply means for the cavity, an air suction/discharge means, and an oxygen sensor. Accordingly, when pressurized supply of the molten metal is performed, the inert gas is supplied into the cavity and the air inside the cavity is sucked/discharged at the same time, thereby quickly replacing the inside of the cavity with an inert gas atmosphere.
  • the vertical driving unit (140) may include a vertical cylinder (142) installed on a fixed plate (114) and connected to a movable plate (130) to move the movable plate (130) up and down relative to the fixed plate (114).
  • the movable plate (130) may be installed at the tip of a piston rod of the vertical cylinder (142). Accordingly, when the vertical cylinder (142) is elastically driven, the movable plate (130) moves up and down, and the upper die (154) installed on the movable plate (130) may engage with or be separated from the lower die (152).
  • the holding furnace (180) has a crucible (182) that holds molten metal inside.
  • the holding furnace (180) maintains the molten metal in the crucible (182) at an appropriate temperature.
  • the holding furnace may have a heat-retaining function to protect the crucible and prevent the molten metal held in the crucible from solidifying.
  • the stock (172) is connected to the injection port of the mold and functions as a passage for supplying molten metal to the mold.
  • the lower end of the stock (172) is formed long enough to be immersed in the molten metal of the holding furnace and extends toward the bottom of the crucible. Accordingly, the molten metal contained in the crucible (182) can be supplied to the lower mold through the stock (172).
  • the pressure section applies differential pressure to the inside of the mold (150) and the furnace (180) to inject the molten metal into the mold.
  • the pressure unit may include a pressurized gas storage tank for applying gas pressure to the inside of the heat insulating furnace (180) and the inside of the mold (150), an injection line for injecting pressurized gas from the storage tank into the inside of the heat insulating furnace (180) and the inside of the mold (150), a pressure regulator installed in each injection line, and a control unit for controlling the pressure regulator to control the gas pressure of each line.
  • the control unit adjusts the pressure inside the mold according to the differential pressure casting process.
  • the control unit can control and drive a pressure regulator to apply pressure to the inside of the mold or the inside of the holding furnace, or remove the pressure by exhausting the internal high-pressure gas, and form a differential pressure between the mold and the inside of the holding furnace.
  • the mold When the molten metal is filled into the cavity, the mold is cooled while maintaining the pressure inside the holding furnace (180) at a constant level, thereby solidifying the molten metal inside the cavity.
  • the mold (150) When the cooling is complete, the mold (150) is opened, and the solidified casting is ejected from the mold (150) by driving the ejection unit (160), thereby completing one process.
  • the mold (150) may further be provided with an exhaust line (190) for removing internal pressurized gas.
  • An exhaust valve (192) for opening and closing the exhaust line (190) is installed on one side of the exhaust line (190).
  • the exhaust valve (192) may be operated, for example, before opening the mold (150) after casting is completed to discharge the pressurized gas inside the mold (150).
  • the filtering part of this embodiment is provided in the mold (150) and removes foreign substances generated inside the mold (150) during casting.
  • FIGS 2 and 3 illustrate the configuration of a filtering unit according to the present embodiment.
  • the filtering unit of the present embodiment will be described with reference to Figures 2 and 3.
  • the filtering unit of the present embodiment may include a circulation line (210) branched from the exhaust line (190) of the mold (150) and connected to the inside of the mold (150) to circulate gas inside the mold (150), a circulation valve (212) installed in the circulation line (210) to selectively open and close the circulation line (210) according to a signal from the control unit (200), and a filter unit (220) connected to one side of the circulation line (210) to remove foreign substances from gas moving along the circulation line (210).
  • a circulation line (210) branched from the exhaust line (190) of the mold (150) and connected to the inside of the mold (150) to circulate gas inside the mold (150
  • a circulation valve (212) installed in the circulation line (210) to selectively open and close the circulation line (210) according to a signal from the control unit (200)
  • a filter unit (220) connected to one side of the circulation line (210) to remove foreign substances from gas moving along the circulation line (210).
  • the pressure of the mold (150) rises and stabilizes and the circulation line (210) is opened during the process of injecting the molten metal the gas inside the mold (150) flows into the circulation line due to the pressure difference. Accordingly, foreign substances such as dust generated by the high-temperature molten metal can flow into the circulation line (150) and be removed while passing through the filter unit (220).
  • the circulation line (210) may be installed in front of the exhaust valve (192) along the exhaust line (190). That is, as shown in FIG. 2, the circulation line (210) is connected to the exhaust line (190) at a position between the mold (150) and the exhaust valve (192). Accordingly, the exhaust line (190) may be connected to the circulation line (210) when the exhaust valve (192) installed in the exhaust line (190) is closed and blocks the exhaust line (190).
  • the exhaust valve (192) is operated to block the exhaust line (190), and as the circulation valve (212) is opened, the exhaust line (190) is connected to the circulation line (210).
  • the gas inside the mold (150) can be continuously circulated into the mold (150) through the exhaust line (190) and the circulation line (210).
  • the circulation line (210) connects the exhaust line (190) and the mold (150), when the exhaust line (190) is closed and blocked, the gas inside the mold (150) does not escape to the outside through the circulation line (210). Accordingly, the pressure inside the mold (150) can be maintained as is.
  • the inside of the mold (150) and the circulation line (210) are connected as one to form a closed space.
  • the high-pressure gas inside the mold (150) can move to the circulation line (210), which is a connected space, but is not discharged to the outside of the mold (150). Therefore, the gas inside the mold (150) can be circulated through the circulation line (210) while preventing loss of pressure inside the mold (150).
  • the circulation line (210) may be provided separately from the exhaust line (190) and installed directly on the mold (150) in addition to a structure branched from the exhaust line (190) provided on the mold (150).
  • the filtering unit may further include a check valve (214) installed between the filter unit (220) and the mold (150) to block the backflow of gas to the circulation line (210).
  • the check valve (214) allows the gas inside the mold (150) to flow only in the forward direction through the circulation line (210).
  • the forward direction may mean the direction in which gas flows into the inlet side of the filter unit (220) and flows out through the outlet side.
  • the circulation valve (212) when the circulation valve (212) is opened, the gas inside the mold can flow smoothly toward the filter unit (220) without flowing in the reverse direction. Accordingly, the high-pressure gas containing foreign substances can be passed through the filter unit (220) installed in the circulation line (210) and flow back into the mold (150) with the foreign substances removed.
  • the filtering unit may further include a gas transfer pump (216) installed on one side of the circulation line (210) to induce the flow of gas inside the mold (150) into the circulation line (210).
  • a gas transfer pump (216) installed on one side of the circulation line (210) to induce the flow of gas inside the mold (150) into the circulation line (210).
  • the gas transfer pump (216) forces the high-pressure gas inside the mold (150) through the circulation line (210) while minimizing fluctuations in the pressure inside the mold (150).
  • the gas transfer pump (216) can be applied to any structure capable of transferring gas.
  • the gas inside the mold (150) can be more smoothly guided forward and moved along the circulation line (210). Accordingly, the high-pressure gas can be continuously and smoothly moved through the circulation line (210) to remove foreign substances more effectively.
  • FIG. 3 shows the structure of the filter unit (220) of this embodiment.
  • the filter unit (220) may include a housing (223) having an inlet (221) and an outlet (222) through which gas passes, and plates (224) arranged in a zigzag shape in an alternating manner inside the housing (223) to reduce the flow speed of the gas and separate foreign substances from the gas.
  • the filter unit (220) may further include a filter membrane (225) positioned at the rear end of the plate (224) to filter out foreign substances contained in the gas.
  • the housing (223) is connected to the circulation line (210) through an inlet (221) and an outlet (222) formed at each end of the housing (223). Accordingly, high-pressure gas moving through the circulation line (210) flows into the housing (223) through the inlet (221), passes through the housing (223), and is discharged through the outlet (222).
  • the grating plate (224) guides the flow of high-pressure gas in a zigzag shape.
  • the high-pressure gas slows down when it collides with the grating plates (224) arranged in a zigzag shape, and during this collision process, foreign matter particles with relatively large diameters and heavy substances fall and are separated from the high-pressure gas.
  • High-pressure gas from which foreign substances are separated while primarily passing through the grating (224), can secondarily remove foreign substances while passing through the filter membrane (225) arranged on the outlet side of the housing (223).
  • the filter membrane (225) may be a membrane structure for filtering out fine particles.
  • the filter membrane (225) can remove fine and light particles that are not separated from the plate (224).
  • the clean high-pressure gas with foreign substances removed is reintroduced into the mold (150) through the circulation line (210).
  • the mold (150) and the circulation line (210) are connected as one, so even if high-pressure gas flows back into the mold (150), the pressure inside the mold (150) does not change.
  • casting can proceed normally while maintaining the set differential pressure regardless of the removal of foreign substances inside the mold (150).
  • control unit (200) closes the circulation valve (212) installed in the circulation line (210) to block the circulation line (210). Then, according to the process, the exhaust valve (192) installed in the exhaust line (190) is opened to exhaust the high-pressure gas inside the mold (150).
  • the circulation line (210) is blocked, so the gas inside the mold (150) can be smoothly exhausted through the exhaust line (190).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

L'invention concerne un appareil de filtration pour équipement de coulée sous pression différentielle, comprenant, de façon à éliminer efficacement des corps étrangers générés dans un moule pendant la coulée : une plaque de base destinée à former le fond de celui-ci ; des axes verticaux disposés à la verticale sur la plaque de base ; une plaque fixe disposée au sommet des axes verticaux de manière à supporter ces derniers ; une table de travail qui peut coulisser verticalement le long des axes verticaux et qui comporte une matrice inférieure disposée au-dessus ; une plaque mobile qui est disposée au-dessus de la table de travail de façon à coulisser verticalement le long des axes verticaux, et qui comporte une matrice supérieure disposée au-dessous ; une partie d'entraînement verticale disposée sur la plaque fixe et reliée à la plaque mobile afin de déplacer verticalement la plaque mobile ; un four retenant la chaleur disposé sur la plaque de base, et relié à la table de travail de façon à fournir du métal fondu au moule ; un chargeur, qui relie le four retenant la chaleur et le moule de façon à alimenter le moule en métal fondu en provenance du four retenant la chaleur ; une partie de pression, qui applique une pression différentielle au four retenant la chaleur et au moule de façon à injecter le métal fondu dans le moule ; et une partie de filtration reliée au moule de façon à éliminer les corps étrangers générés dans le moule.
PCT/KR2023/008580 2023-06-21 2023-06-21 Appareil de filtration pour équipement de coulée sous pression différentielle Pending WO2024262667A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2023/008580 WO2024262667A1 (fr) 2023-06-21 2023-06-21 Appareil de filtration pour équipement de coulée sous pression différentielle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2023/008580 WO2024262667A1 (fr) 2023-06-21 2023-06-21 Appareil de filtration pour équipement de coulée sous pression différentielle

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WO2024262667A1 true WO2024262667A1 (fr) 2024-12-26

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016215257A (ja) * 2015-05-25 2016-12-22 日産自動車株式会社 加圧鋳造装置及び鋳造方法
JP2017127899A (ja) * 2016-01-22 2017-07-27 株式会社デンソー 真空ダイカスト装置
JP2022152292A (ja) * 2021-03-29 2022-10-12 本田技研工業株式会社 鋳造金型用のガス吸引装置
EP4094866A1 (fr) * 2021-05-28 2022-11-30 Nemak, S.A.B. de C.V. Séparateur pour système de moulage sous vide à haute pression
KR102483175B1 (ko) * 2020-11-24 2022-12-30 (주)진양기계 차압 주조 설비의 냉각 장치
KR20230143741A (ko) * 2022-04-06 2023-10-13 (주) 진양기계 차압 주조 설비의 필터링 장치

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016215257A (ja) * 2015-05-25 2016-12-22 日産自動車株式会社 加圧鋳造装置及び鋳造方法
JP2017127899A (ja) * 2016-01-22 2017-07-27 株式会社デンソー 真空ダイカスト装置
KR102483175B1 (ko) * 2020-11-24 2022-12-30 (주)진양기계 차압 주조 설비의 냉각 장치
JP2022152292A (ja) * 2021-03-29 2022-10-12 本田技研工業株式会社 鋳造金型用のガス吸引装置
EP4094866A1 (fr) * 2021-05-28 2022-11-30 Nemak, S.A.B. de C.V. Séparateur pour système de moulage sous vide à haute pression
KR20230143741A (ko) * 2022-04-06 2023-10-13 (주) 진양기계 차압 주조 설비의 필터링 장치

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