EP1857201B1 - Sand-introducing-type sand molding machine - Google Patents

Sand-introducing-type sand molding machine Download PDF

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Publication number
EP1857201B1
EP1857201B1 EP07012739.4A EP07012739A EP1857201B1 EP 1857201 B1 EP1857201 B1 EP 1857201B1 EP 07012739 A EP07012739 A EP 07012739A EP 1857201 B1 EP1857201 B1 EP 1857201B1
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EP
European Patent Office
Prior art keywords
sand
compressed air
pressure
molding
introducing
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.)
Active
Application number
EP07012739.4A
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German (de)
English (en)
French (fr)
Other versions
EP1857201A1 (en
Inventor
Minoru c/o Sintokogio Ltd. HIRATA
Takuya c/o Sintokogio Ltd. Nitta
Hisashi c/o Sintokogio Ltd. Harada
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
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Sintokogio Ltd
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Publication date
Application filed by Sintokogio Ltd filed Critical Sintokogio Ltd
Publication of EP1857201A1 publication Critical patent/EP1857201A1/en
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Publication of EP1857201B1 publication Critical patent/EP1857201B1/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C19/00—Components or accessories for moulding machines
    • B22C19/04—Controlling devices specially designed for moulding machines
    • 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

Definitions

  • the present invention relates to a sand-introducing-type sand molding machine that produces a sand mold by introducing molding sand into a molding flask or a molding space and by filling the space with it by using compressed air.
  • blowing-type sand molding machine As one of this kind of machine. It generally comprises a blow head, a plurality of adjusting means for adjusting the pressure and flow of compressed air, wherein outlets of the means communicate with the blow head in parallel, a source of the compressed air that communicates with the inlets of the means, pressure-detecting means for detecting the pressure inside the blow head, and a controller that controls the operations of the adjusting means and the pressure-detecting means that is electrically connected to them.
  • the molding machine supplies compressed air into the blow head to let the molding sand in the blow head move into a molding flask or a molding space and fills it with the sand, and then makes a sand mold by compressing the molding sand that has been filled (see Japanese Patent Laid-open Publication No. H06-277800 ).
  • the conventional blowing-type sand molding machine cannot adequately control the pressure inside the blow head so as to have it correspond to the pattern shape, because the supplied compressed air changes the pressure of its inside in a stepwise manner or slowly, as in Fig. 3 . Accordingly, it does not fill enough molding sand into the molding flask, etc., or it wastes compressed air.
  • the purpose of the present invention is to resolve these problems and to provide a sand-introducing-type sand molding machine that can adequately control the pressure-variation inside the sand tank to correspond to the pattern shape by supplying the compressed air.
  • the sand-introducing-type sand molding machine of the present invention produces a sand mold by introducing molding sand into a molding flask or a molding space and filling the space with it by using compressed air. It comprises a sand tank for pressing the molding sand by the compressed air that is equipped with compressed air supplying devices to fluidize the molding sand, a communicating tube that communicates with the sand tank, a plurality of adjusting means for adjusting the pressure and flow of the compressed air which leading the sand tank that are installed in parallel, and each outlet of which is connected to the communicating tube, and each inlet of which is connected to the source of the compressed air, an electro-pneumatic proportional valve, of which the supply and discharge ports are respectively connected to a source of the compressed air and to the communicating tube, a pressure-detecting means that is provided on the sand tank for detecting the pressure inside it, and a controller that controls the operations of the plurality of the adjusting means and the electro-pneumatic proportion
  • Compressed air supplying devices to fluidize the molding sand is the means that blows the compressed air to the inside of the sand tank, and the method is no object.
  • a parting plate of the permeable partitions off dual structure, i.e. the trunk wall of the main body of sand tank making pressure tank structure, and to have a hollow chamber is formed, it is possible with the thing which comprised this parting porous plate.
  • this parting plate a lot of through-holes which a mean pore size is 10-500 ⁇ m, and is smaller than the particle size of the sand particle are provided and thickness can be comprised with the plastic board which is 5 - 20mm.
  • the sand tank has at least a function to pressurize the top surface of the molding sand by the compressed air which the supplying devices is not put through.
  • a source of the compressed air connected to the adjusting means and a source of the compressed air connected to the electro-pneumatic proportion valve may be adjusted by different or same pressure.
  • these sources of the compressed air may be integrated into one.
  • the apparatus constructed as above first sets the operating conditions of the adjusting means in the controller, and then supplies the compressed air from the adjusting means to control the pressure inside the sand tank to cause it to be less than the appropriate pressure needed for filling the sand so as to have it correspond to the pattern shape in it. Then, under the control of the pressure-detecting means, it opens the plurality of adjusting means in a stepwise manner or all at once, as well as operating the electro-pneumatic proportional valve. In this way, it causes the pressure variation inside the sand tank to correspond to a given ideal curve.
  • the given ideal pressure curve is a pressure curve to realize ideal filling density.
  • the filling density of the upper part and the lower part of mold become high and the central part of mold with the pattern becomes low in the ideal filling density on a filling cavity, and a mold density is similar within the central, upper and the lower part and mold quality is high when it is compressed afterwards.
  • the present invention is under the control of the pressure-detecting means, it opens the plurality of adjusting means in a stepwise manner or all at once, as well as operating the electro-pneumatic proportional valve.
  • the molding machine comprises a sand tank 1 for pressing the molding sand by the compressed air, which sand tank is equipped with compressed air supplying devices to fluidize the molding sand, a communicating tube 2 that communicates with the sand tank 1, a plurality of VP valves 5 (flow- and pressure-control valves) as a plurality of adjusting means for adjusting the pressure and flow of the compressed air that are installed in parallel, and each outlet of which is connected to the communicating tube 2, and each inlet of which is connected to the source of the compressed air 4a through an auxiliary tube 3, VY valve (an electro-pneumatic proportional valve) 6, of which the supply and discharge ports are respectively connected to the source of the compressed air 4b and to the communication tube 2, a pressure-detecting means 7 that is provided on the sand tank 1 for detecting the pressure inside it, and a controller
  • An electro-pneumatic proportional valve is an electromagnetic valve that supplies compressed air at any pressure on instructions sent by a controller.
  • the apparatus constructed as above first sets the operating conditions of a plurality of the VP valves 5 in the controller 8, and then supplies the compressed air from the VP valves 5 to control the pressure inside the sand tank 1 to cause it to be less than the appropriate pressure needed for filling the sand so as to have it correspond to the pattern shape in it. Then, under the control of the pressure-detecting means 7, it opens a plurality of the VP valves 5 in a stepwise manner, as well as operating the VY valve 6. In this way, it causes the pressure variation inside the sand tank 1 to correspond to a given ideal curve as in Fig. 2 .
  • FIG. 4 A schematic drawing of the sand molding machine of the present invention is shown in FIG. 4 .
  • FIG. 5 A graph that shows an ideal pressure curve inside the sand tank is shown in Fig. 5 .
  • Fig. 4 is formed almost same as Fig. 1 .
  • a controller 8 that controls the operations of the VP valves 5 and the VY valve 6 that is electrically connected to the VP valves 5 and the pressure-detecting means 7 and the VY valve 6, being constituted is different.
  • the sand molding machine first sets the operating conditions of a plurality of the VP valves 5 and VY valve 6 and ideal pressure curve in the controller 8, and then supplies the compressed air from the VP valves 5 to control the pressure inside the sand tank 1 to cause it to be less than the appropriate pressure needed for filling the sand so as to have it correspond to the pattern shape in it, under the control of the pressure-detecting means 7, it opens and closes a plurality of the VP valves 5 in a stepwise manner up to the required maximum quantity, as well as operating the VY valve 6.
  • the compressed air pressure curve supplied to sand tank 1 from VP valve 5 is shown in Fig. 6 .
  • the compressed air pressure curve supplied to sand tank 1 from VY valve 6 is shown in Fig. 7 .
  • the pressure curve in sand tank 1 is ideal as shown in Fig. 8 .
  • the synthesized pressure force curve ( FIG. 8 ) in a sand tank is adjusted to extremely resemble an ideal pressure force curve ( FIG. 5 ).
  • Pressure curve inside the sand tank ( Fig. 8 ) which is synthesized is adjusted in order quite to resemble to ideal pressure curve ( Fig. 5 ).
  • the filling density of sand S of the upper part and the lower part is high, and central part with the pattern becomes low, and it is with a high quality and mold density is similar to the central part with the pattern and the lower part on a filling cavity when it is compressed afterwards.
  • the pressure force to an adjusting means assumes 0.1- 0.3MPa
  • the pressure force to an electro-pneumatic proportional valve can be assumed 0.5MPa degree.
  • an electro-pneumatic proportional valve can just use factory air pressure in what can adjust for given pressure by electrical signal.
  • the sand tank 1 has compressed air supplying devices to fluidize the molding sand and a function to pressurize the molding sand by blowed compressed air-
  • the sand tank may be any construction in so far as it has a function to pressurize the molding sand by the compressed air. Furthermore, if you can obtain ideal sand filling, it is clear for a uniform mold to be possible with the compression after that by squeeze board B1 and B2.
  • the molding sand of the present invention the green sand which designates the bentonite as the binder is most desirable. Also, the present invention can be used for sand filling not only to the molding flask which is the tight molding machine of the existence frame but also to the molding space which is the flaskless molding machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP07012739.4A 2007-01-16 2007-06-28 Sand-introducing-type sand molding machine Active EP1857201B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007006482 2007-01-16
JP2007132487 2007-05-18

Publications (2)

Publication Number Publication Date
EP1857201A1 EP1857201A1 (en) 2007-11-21
EP1857201B1 true EP1857201B1 (en) 2017-11-29

Family

ID=38441846

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07012739.4A Active EP1857201B1 (en) 2007-01-16 2007-06-28 Sand-introducing-type sand molding machine

Country Status (7)

Country Link
US (1) US20080169079A1 (ko)
EP (1) EP1857201B1 (ko)
JP (1) JP4697609B2 (ko)
KR (1) KR101106868B1 (ko)
BR (1) BRPI0720949B8 (ko)
MX (1) MX2009007563A (ko)
WO (1) WO2008087758A1 (ko)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114700468A (zh) * 2022-04-01 2022-07-05 朱兴丰 一种铸铁用复合砂型自动制造设备
CN115007798A (zh) * 2022-06-15 2022-09-06 安徽汉扬精密机械有限公司 一种全自动卧式砂型铸造机及其工作方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3965961A (en) * 1971-09-23 1976-06-29 Dansk Industri Syndikat A/S Method of operating automatic mold part producing apparatus
JPH0515415Y2 (ko) * 1988-10-07 1993-04-22
WO1991014525A1 (en) * 1990-03-20 1991-10-03 Dansk Industri Syndikat A/S A method for producing a series of casting molds or mold parts, and an apparatus for carrying out the method
JP3092764B2 (ja) * 1993-03-26 2000-09-25 新東工業株式会社 吹込み式鋳型造型方法
JP2925504B2 (ja) * 1996-10-01 1999-07-28 メタルエンジニアリング株式会社 鋳型造型用距離検出装置
JP3332214B2 (ja) * 1998-03-27 2002-10-07 新東工業株式会社 吹込み式鋳型造型機
DE19823134C1 (de) * 1998-05-23 1999-12-02 Joachim Laempe Verfahren und Vorrichtung zur Herstellung von Formteilen für Gießereizwecke aus Sand
JP3900447B2 (ja) * 1998-10-28 2007-04-04 新東工業株式会社 鋳物砂の圧縮装置
WO2001019546A1 (fr) * 1999-09-16 2001-03-22 Sintokogio, Ltd. Procede de moulage par soufflage permettant et systeme associe
EP1149646B1 (en) 1999-11-04 2011-05-18 Sintokogio, Ltd. Molding device and molding method for sand mold
BR0104490A (pt) * 2000-02-17 2002-05-21 Sintokogio Ltd Aparelho e método para introduzir areia de moldagem em um espaço de molde definido por uma placa padrão
JP2002018552A (ja) * 2000-07-04 2002-01-22 Sintokogio Ltd 鋳物砂吹込み装置
US6957687B2 (en) 2001-08-06 2005-10-25 Sintokogio, Ltd. Method and system for monitoring a molding machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP1857201A1 (en) 2007-11-21
US20080169079A1 (en) 2008-07-17
MX2009007563A (es) 2009-08-13
BRPI0720949B8 (pt) 2016-10-11
JP2009000690A (ja) 2009-01-08
KR101106868B1 (ko) 2012-01-19
BRPI0720949B1 (pt) 2016-03-29
WO2008087758A1 (en) 2008-07-24
JP4697609B2 (ja) 2011-06-08
KR20090101488A (ko) 2009-09-28
BRPI0720949A2 (pt) 2014-03-18

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