EP0774311A1 - Vorrichtung und Verfahren zur Herstellung eines Kernes - Google Patents

Vorrichtung und Verfahren zur Herstellung eines Kernes Download PDF

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Publication number
EP0774311A1
EP0774311A1 EP96118272A EP96118272A EP0774311A1 EP 0774311 A1 EP0774311 A1 EP 0774311A1 EP 96118272 A EP96118272 A EP 96118272A EP 96118272 A EP96118272 A EP 96118272A EP 0774311 A1 EP0774311 A1 EP 0774311A1
Authority
EP
European Patent Office
Prior art keywords
air
core space
introducing
gas
molding sand
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.)
Withdrawn
Application number
EP96118272A
Other languages
English (en)
French (fr)
Inventor
Nagato Uzaki
Masayoshi Kasazaki
Hisashi Harada
Kazuo Sugimoto
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.)
Sintokogio Ltd
Original Assignee
Sintokogio 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
Priority claimed from JP32366095A external-priority patent/JP3322382B2/ja
Priority claimed from JP8061985A external-priority patent/JPH09225583A/ja
Application filed by Sintokogio Ltd filed Critical Sintokogio Ltd
Publication of EP0774311A1 publication Critical patent/EP0774311A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening
    • B22C9/123—Gas-hardening

Definitions

  • This invention relates to an apparatus and method for producing a core with gas-curable molding sand.
  • a method and apparatus for producing a core is conventionally known wherein gas-curable molding sand is charged into a core space by the air-blowing method, and is then cured by curing gas introduced into the space.
  • Japanese Patent Publication No. 48 - 13804 discloses such an apparatus. It has a core box having a cope and a drag to mate each other to define a core space therebetween. The cope is fixedly mounted on a frame, and the drag is supported by a cylinder for vertical movement to and away from the fixed cope. An assembly of a gassing means, a blow head, and a core-pushing mechanism is disposed above the core box. The assembly is horizontally slidable on the frame through wheels such that it mates the upper portion of the cope to supply an air blow and curing gas into the core space.
  • the purpose of this invention is to provide an apparatus and method for producing a core having a high density wherein the number of vent plugs to be used and cost and time to produce a metal mold are reduced.
  • be method of the present invention for producing a core includes the steps of charging gas-curable molding sand into the core space, reducing the pressure of the core space to 2 - 100 Torr, introducing from above an air flow into the core space at a rate that increases the pressure of the core space at 50 - 600 Kg/cm 2 /sec to apply pressure to the upper surface of the gas-curable molding sad to give it a high density, and introducing curing gas into the core space to harden the molding sand.
  • the apparatus of the present invention is one of the type disclosed in Japanese Patent Publication No. 48 - 13804. However, in be apparatus of the present invention there is evacuating means to reduce the pressure of the core space.
  • the apparatus includes a blow head, pressure chamber, core halves to define a core space therebetween, evacuating means to reduce the pressure of the core space, a valve for air-blowing, a valve for introducing air, means for introducing curing gas, and means for discharging the curing gas.
  • an air flow is suddenly introduced into the evacuated core space.
  • This introduced air flow applies an impulse pressure to be upper surface of the molding sand, and therefore it is consolidated to a higher density than an upper surface that is consolidated only by air-blowing.
  • a plurality of columns 2 are mounted on the base 1, and a frame F is mounted on the top of the columns 2.
  • a sand hopper 4 having a sand feeding gate 3, and an air-introducing means having a valve 5 for air-blowing, a valve 6 for introducing air, and an air tank 7.
  • a blow head 10 is mounted on the frame below the sand hopper 4.
  • the blow head 10 has a port 8 for receiving gas-curable molding sand S from the hopper 4 and introducing compressed air 10 into the blow head.
  • the blow head 10 is moved horizontally along the frame F so that it communicates with the air-blowing valve 5.
  • a pressure chamber 11 is horizontally spaced apart from and connected to the blow head 10 so that the assembled pressure chamber and the blow head are moved horizontally along the frame by a cylinder 12 connected to the pressure chamber 11.
  • the pressure chamber 11 communicates with the air-introducing valve 6 at the top and sealingly meets the top of a metal cope 13a or metal mold half at the bottom.
  • the metal cope 13a is mounted on the columns 2 such that it can move up from its position shown in Fig. 2.
  • a lifter table T is disposed between the lower parts of the columns 2.
  • the lifter table T supports a metal drag or metal mold half 13b on the top of the table T.
  • the cope and drag or mold halves define a core space 14 between them.
  • a plurality of apertures 13c for air-blowing are formed in the cope 13a. These apertures 13c communicate with blow nozzles 9 formed in the bottom of the blow head 10.
  • vent plugs 16 fit in vent holes 15 formed in the cope 13a and drag 13b.
  • the vent holes 15 communicate with a vacuum pump P or evacuating means 18, which evacuates the core space 14.
  • One end of the evacuating means 18 communicates with the upper and lower parts of the core space 14 through the bottom of the pressure chamber 11, the wall of the lifter table 4, and vent holes 15, while the other end communicates with the vacuum pump P through an evacuating valve 17.
  • the pump P reduces the pressure of the core space 14 to a pressure of 2 - 100 Torr.
  • vent holes 15 of the pressure chamber 11 and cope 13a communicate with means 19 for introducing curing gas from a gas generator 19 into the core space 14 through a valve 22.
  • the vent holes 15 of the drag 13b communicate with a curing-gas-discharging means 21 through the lifter table T and a valve 23.
  • the gas-curable molding sand S which has been previously mixed at a location (not shown), is placed into the hopper 4.
  • the amount of the molding sand in the hopper which is more than one shot for the core space, is then fed into the blow head 10 when the sand feeding gate 3 is opened.
  • the assembly of the blow head 10 and pressure chamber 11 are moved laterally by the cylinder 12 until the blow head 10 is located just above the mold halves and lifter table T (Fig. 2).
  • the port 8 is connected to a port 8a of the valve 6.
  • the lifter table T is then moved up with the drag 13b until the drag 13b mates and pushes up the cope 13a so that the blow nozzles 9 engage and communicate with the apertures 13c of the cope 13a.
  • the lifter table T is locked at that position. (This state is shown in Fig. 3 of the second embodiment of the present invention.)
  • the air-blowing then starts.
  • compressed air from the air tank 7 is introduced into the blow head 10.
  • the air blown into the blow head 10 and the molding sand in it flow together through the nozzles 9 into the core space 14, so that the molding sand accumulates in the core space 14 and the air is discharged through the vent plugs 16.
  • the location of these vent plugs can be determined by just considering their proper venting. Arranging them for a good consolidation of the molding sand need not be considered.
  • the lifter table T is then lowered until the cope 13a returns to its original lower position shown in Fig. 2, where the cope 13a is separated from the blow head 10.
  • the assembly 10, 11 is moved to its original position shown in Fig. 1.
  • the lifter table T is then moved up until air supply holes 11a of the pressure chamber 11 engage and communicate with the apertures 13c of the cope 13a.
  • the core space 14 is evacuated by opening the valve 23 so that the pressure of the core space becomes 2 - 100 Torr.
  • the location of the vent plugs 16 can be determined by just considering their proper venting, and a good consolidation need not be considered.
  • the valve 6 is then opened, so that an air flow is suddenly introduced into the core space 14.
  • the flow applies an impulse pressure to the surface of the molding sand in the core space, so that the molding sand S is well consolidated.
  • it has a charging density higher than that when it is subjected only to the air blow.
  • Curing gas from the curing-gas-introducing means 20 is then introduced into the core space 14.
  • the gas passes through the molding sand S, so that it is hardened.
  • Purging is then carried out, if necessary.
  • the lifter table T is lowered, while upper and lower pushers 25, 25 are operated to push and take out the core product.
  • binders such as a water glass, phenol resin, polyurethane resin, furan resin, etc. are used for gas-curable molding sand.
  • curing gases such as carbon dioxide, TEA gas, sulfur dioxide, methyl formate, etc. may be used.
  • the air is introduced into the pressure chamber such that the pressure in the chamber is increased at a rate of 50 - 600 kg /cm 2 /sec. More preferably the rate is 200 - 400 kg /cm 2 /sec.
  • the air to be introduced may be ambient air of the atmosphere or compressed air. When compressed air is used, its pressure is preferably 10 kg/cm 2 at maximum. The pressure may be optimized depending on the size and shape of the air-introducing valve.
  • Figs. 1 and 2 The above embodiment shown in Figs. 1 and 2 is exemplary only. Clearly to one skilled in the art some modification may be made to the embodiment.
  • the evacuating means 18 communicates with the core space at its upper and lower parts, it may be modified to communicate with the space at both sides of it.
  • vertical mold halves may be used instead of using a cope and a drag. The mold halves may be opened and closed by one or more cylinders that extend horizontally.
  • the blow head 10 and pressure chamber 11, which in the embodiment are connected, may, alternatively, be separated and moved separately.
  • the molding sand S is charged into the core space by air-blowing.
  • This charge can be done using the gravity of the sand or using a vacuum.
  • the molding sand is charged into it due to the pressure difference between the blow head 10 and the vacuum.
  • the blow head 10 acts as a pressure chamber like the pressure chamber 11.
  • the pressure chamber 11 can be eliminated.
  • either the air-blowing valve 5 or air-introducing valve 6 may be also eliminated.
  • Fig. 3 shows a second embodiment of the apparatus of the invention. In it the same reference numbers are designated for the same elements as in Figs. 1 and 2.
  • the apparatus includes a frame F secured to columns 2 mounted on a base 1, the same as in Figs. 1 and 2.
  • a sand hopper 4 which has a sand-feeding gate 3, and an air-introducing mean, which has an air-introducing valve 6 and air tank 7, are mounted on the frame F.
  • a hollow cylindrical connecting body H is disposed under the hopper 4.
  • the connecting body H has a port 8 to receive molding sand from the hopper and a port 8b through which air is introduced into the connecting body H.
  • Under the connecting body H a pressure chamber 31 having nozzles 9 is disposed.
  • the pressure chamber 31 and the connecting body H are integrally fixed to each other and they move integrally.
  • the port 8b is opened and closed by a valve 6.
  • a gas chamber 32 is connected to the pressure chamber 31 so that the assembled gas chamber and pressure chamber are horizontally moved along the frame F by a cylinder 12.
  • the gas chamber 32 communicates with a gas generator 19.
  • a pusher 25 having pushing pins is disposed within the gas chamber.
  • the gas chamber 32 sealingly meets a metal mold half or cope 13a when moved onto it.
  • a sand-containing box B is disposed. Since this box B has a turner R, it can drop the molding sand contained in it into the pressure chamber 31 when turned over by the turner R.
  • a sand-measuring means having a belt conveyor measures the molding sand of one shot by controlling the operation of the belt conveyor and the period that the sand-feeding gate 3 is opened.
  • the gate 3 is then closed, and a core space 14 is evacuated by evacuating means 18 to a pressure of 2 - 100 Torr.
  • evacuating means 18 to a pressure of 2 - 100 Torr.
  • the air-introducing valve 6 is then opened to apply compressed air to the pressure chamber 31.
  • the pressure of the compressed air is preferably 10 kg/cm 2 at maximum, and the rate of the air pressure that increases in the core space is preferably 50 - 600 kg /cm 2 /sec.
  • the air flow and molding sand in the pressure chamber flow into the core space 14. The air flow goes out through the vent plugs 16, and the molding sand is consolidated in the core space 14. It is consolidated to a higher density than the initial density due to just the vacuum.
  • the gas chamber 32 is then connected to the mold halves in a way similar to the embodiment of Figs. 1 and 2. Similarly, the molding sand is cured and taken out from the mold halves by upper and lower pushers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP96118272A 1995-11-17 1996-11-14 Vorrichtung und Verfahren zur Herstellung eines Kernes Withdrawn EP0774311A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP323660/95 1995-11-17
JP32366095A JP3322382B2 (ja) 1995-11-17 1995-11-17 中子造型方法及びその装置
JP8061985A JPH09225583A (ja) 1996-02-23 1996-02-23 中子造型方法及び装置
JP61985/96 1996-02-23

Publications (1)

Publication Number Publication Date
EP0774311A1 true EP0774311A1 (de) 1997-05-21

Family

ID=26403062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96118272A Withdrawn EP0774311A1 (de) 1995-11-17 1996-11-14 Vorrichtung und Verfahren zur Herstellung eines Kernes

Country Status (3)

Country Link
EP (1) EP0774311A1 (de)
KR (1) KR970029928A (de)
CN (1) CN1159374A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102078933A (zh) * 2010-12-24 2011-06-01 山西华德冶铸有限公司 自动合箱装置
CN102632203A (zh) * 2012-05-07 2012-08-15 苏州明志科技有限公司 一种冷芯制芯方法
DE102016123050A1 (de) 2016-11-29 2018-05-30 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Verfahren zum Herstellen von Kernen oder Formen für den Metallguss

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* Cited by examiner, † Cited by third party
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CN1075965C (zh) * 1998-05-19 2001-12-12 北京中租铸造模具技术开发公司 简易真空造型生产线
DE10144193C1 (de) * 2001-09-08 2002-10-31 Vaw Mandl & Berger Gmbh Linz Verfahren und Formschießmaschine zum Herstellen von Formteilen, wie Gießkernen, für Gießformen zum Vergießen von Metallschmelze
CN102310166B (zh) * 2011-10-19 2012-12-26 华东泰克西汽车铸造有限公司 一种用于汽车发动机缸体油道中砂芯的生产工艺
CN103192031A (zh) * 2013-04-03 2013-07-10 苏州苏铸成套装备制造有限公司 优化的砂芯成型方法
CN103192028B (zh) * 2013-04-22 2015-06-24 天津凯星科技有限公司 冒口套生产设备
CN103192032B (zh) * 2013-04-22 2016-04-06 山东建筑大学 一种水玻璃砂co2负压吹气硬化工艺
CN103551519A (zh) * 2013-11-14 2014-02-05 邵宏 无掉砂坭芯的制作方法与喷涂装置
CN103978164A (zh) * 2014-04-25 2014-08-13 河南省汤阴县华兴机械制造有限公司 一种铸造箱体本体芯旁侧抽空整体制芯机
CN105108067B (zh) * 2015-08-31 2017-08-25 宁夏共享模具有限公司 一种提升射芯模充砂成型的方法
CN106077523B (zh) * 2016-08-24 2018-11-16 苏州苏铸成套装备制造有限公司 一种抽真空射砂结构
CN109396353B (zh) * 2018-12-24 2020-09-29 沈阳汇亚通铸造材料有限责任公司 铸造用水玻璃砂的吹co2硬化方法
CN113333687B (zh) * 2021-05-18 2022-08-09 苏州明志科技股份有限公司 一种大型砂芯的制芯方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4813804B1 (de) 1968-04-27 1973-05-01
EP0123756A1 (de) * 1983-04-27 1984-11-07 Naniwa Products Co, Ltd Vollautomatische "cold box" Maschine für das Formen eines integrierten Verbundkernes
EP0443287A2 (de) * 1990-02-23 1991-08-28 Naniwa Products Co, Ltd Horizontal geteilte Formmaschine vom Typ stationärer Kernunterkasten
DE9315614U1 (de) * 1993-10-08 1993-12-23 Hottinger Adolf Masch Vorrichtung zum Füllen von Schußköpfen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4813804B1 (de) 1968-04-27 1973-05-01
EP0123756A1 (de) * 1983-04-27 1984-11-07 Naniwa Products Co, Ltd Vollautomatische "cold box" Maschine für das Formen eines integrierten Verbundkernes
EP0443287A2 (de) * 1990-02-23 1991-08-28 Naniwa Products Co, Ltd Horizontal geteilte Formmaschine vom Typ stationärer Kernunterkasten
DE9315614U1 (de) * 1993-10-08 1993-12-23 Hottinger Adolf Masch Vorrichtung zum Füllen von Schußköpfen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102078933A (zh) * 2010-12-24 2011-06-01 山西华德冶铸有限公司 自动合箱装置
CN102632203A (zh) * 2012-05-07 2012-08-15 苏州明志科技有限公司 一种冷芯制芯方法
DE102016123050A1 (de) 2016-11-29 2018-05-30 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Verfahren zum Herstellen von Kernen oder Formen für den Metallguss
WO2018099894A1 (de) 2016-11-29 2018-06-07 HÜTTENES-ALBERTUS Chemische Werke Gesellschaft mit beschränkter Haftung Verfahren zum herstellen von kernen oder formen für den metallguss

Also Published As

Publication number Publication date
KR970029928A (ko) 1997-06-26
CN1159374A (zh) 1997-09-17

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