US20130042989A1 - Method and device by which moulding compound to be processed is kept moist during the production of moulds or cores - Google Patents

Method and device by which moulding compound to be processed is kept moist during the production of moulds or cores Download PDF

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Publication number
US20130042989A1
US20130042989A1 US13/695,446 US201113695446A US2013042989A1 US 20130042989 A1 US20130042989 A1 US 20130042989A1 US 201113695446 A US201113695446 A US 201113695446A US 2013042989 A1 US2013042989 A1 US 2013042989A1
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United States
Prior art keywords
mixture
storage unit
feed device
sand storage
mixing apparatus
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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.)
Abandoned
Application number
US13/695,446
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English (en)
Inventor
Rudolf Wintgens
Martin Faller
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LAEMPE AND MOSSNER GmbH
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LAEMPE AND MOSSNER GmbH
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
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Application filed by LAEMPE AND MOSSNER GmbH filed Critical LAEMPE AND MOSSNER GmbH
Assigned to LAEMPE & MOSSNER GMBH reassignment LAEMPE & MOSSNER GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FALLER, MARTIN, WINTGENS, RUDOLF
Publication of US20130042989A1 publication Critical patent/US20130042989A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C19/00—Components or accessories for moulding machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
    • 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

Definitions

  • the invention relates to a method for producing molds or cores, in particular for foundry purposes, wherein molding compound or sand and at least one binder which is at least predominantly inorganic, water-soluble and/or hygroscopic are mixed by means of a mixing apparatus, and wherein this mixture is fed to at least one sand storage unit of a core or mold production apparatus with the aid of a feed device.
  • the invention furthermore relates to an apparatus for producing molds or cores, in particular for foundry purposes, having a mixing apparatus for mixing molding compound or sand and a binder which is at least predominantly inorganic, water-soluble and/or hygroscopic, and having a feed device for conveying the mixture to a sand storage unit of a core or mold production apparatus.
  • the object is therefore that of providing a method and also an apparatus of the type mentioned in the introduction in which premature drying-out and incrustation of the mixture and the associated contamination of the mixing apparatus and/or of the feed device and/or sand storage unit are largely avoided.
  • the method defined in the introduction provides for the mixture-free region of the mixing apparatus, at least at times, and/or the mixture-free region of the feed device located between the mixing apparatus and the core or mold production apparatus and/or the mixture-free region of the sand storage unit downstream of the feed device and upstream of the core or mold production apparatus to be moistened or kept moist.
  • the moistening establishes a high atmospheric humidity in said regions, which can prevent or reduce evaporation or escape of moisture from the mixture. Therefore, the mixture is unable to harden or dry out or form crusts either completely or in parts.
  • the mixture-free region of the mixing apparatus is moistened or kept moist at least at times at least during the mixing operation. Primarily as a result of the mixing operation, moisture could escape from the mixture into the mixture-free region. By moistening the mixture-free region, it is easily possible to prevent moisture from escaping from the mixture, drying it out, settling on parts of the mixing apparatus and contaminating the mixing apparatus.
  • the atmospheric humidity above the mixture is kept high by feeding in moisture, in particular is kept at approximately 70% to 100%, preferably at approximately 80% to 100%.
  • Such atmospheric humidity values minimize the moisture gradients between the mixture and the air surrounding the mixture, as a result of which the release of moisture from the mixture to the air by evaporation and associated, undesirable hardening of the mixture can be prevented to the greatest possible extent.
  • the liquid which serves for moistening or the water which serves for moistening is atomized by means of ultrasound to form a suspendable aerosol and fed to the mixing apparatus and/or to the feed device and/or to the sand storage unit.
  • the suspendable aerosol here contains such small liquid constituents that they can evaporate directly and increase the atmospheric humidity without condensing beforehand and without being deposited as a condensate in the mixing apparatus and/or the feed device and/or the sand storage unit.
  • the size of the liquid particles produced by ultrasound can lie in the order of magnitude of 0.01 mm or below.
  • a sufficiently high atmospheric humidity which can prevent the sand/binder mixture from drying out, is achieved. Both the mixing operation and the feeding and the storage of the sand/binder mixture can be effected reliably.
  • the aerosol or the quantity of this suspendable aerosol and the magnitude of the volumetric flow provided with the aerosol can be set by changing the pulse packets emitted by the ultrasound generator(s) and/or by changing the voltage of the ultrasound generator(s). In this way, it is possible to adapt the quantity of the suspendable aerosol, with which the mixing apparatus and/or the sand storage unit are moistened, to the existing conditions such as atmospheric humidity, magnitude of the volume to be moistened and ambient temperature.
  • a particularly expedient configuration of the method according to the invention is provided in the fact that the suspendable aerosol is formed and conducted via one or more lines to the mixing apparatus and/or to the feed device and/or to the sand storage unit.
  • the aerosol is therefore produced outside the mixing, feed and/or the sand storage unit. No additional installation space is therefore required in the mixing, feed and/or the sand storage unit for the production of the aerosol. Nevertheless, it is possible to provide a sufficiently high atmospheric humidity, such that it is possible to avoid drying out of the sand/binder mixture without, however, feeding in too much liquid, as a result of which in particular the binder could possibly be washed out or dissolved.
  • the apparatus defined in the introduction is characterized in that the mixing apparatus and/or the feed device and/or the sand storage unit are provided with a moistening device, which acts upon the interior thereof or opens out into the interior thereof.
  • a moistening device acts upon the interior thereof or opens out into the interior thereof.
  • the moistening device prefferably has at least one ultrasound generator in the form of an ultrasound atomizer for water or for a liquid containing water in particular.
  • the invention therefore takes advantage of the fact or knowledge that ultrasound atomizers can atomize water or a water-containing liquid in such a manner that the individual droplets may be smaller than 20 one-thousandths of a millimeter or even smaller than 10 one-thousandths of a millimeter, such that they pass over into atmospheric humidity and are not deposited, or are deposited scarcely, as a film of moisture on parts of the mixing apparatus and/or of the feed device and/or of the sand storage unit.
  • the ultrasound atomizer(s) and a liquid reservoir belonging thereto are arranged spatially separate from the mixing apparatus and/or from the feed device and/or from the sand storage unit and are connected to the region(s) to be moistened via at least one tubular or hose line.
  • Tests have shown that the suspended aerosol which is formed from water or from a water-containing liquid by an ultrasound atomizer can be transported without any problems over a plurality of meters through such a line in order to provide, at the desired location, sufficiently moist air which prevents the mixture of sand or molding compound and binder from drying up in particular in the mixing apparatus itself, the feed device and/or the sand storage unit, without however excessively soaking said mixture.
  • the liquid reservoir with the ultrasound generator(s) can thus advantageously be arranged at a location of the mold or core shooting machine or close to this machine, where sufficient space therefor is available.
  • the mixing apparatus, the feed device and the sand storage unit are each connected to the moistening device via a tubular or hose line.
  • tubular or hose lines provided separately for the individual apparatus regions, it is possible for moist air to be conducted into the mixing apparatus, the feed device and/or the sand storage unit in a manner tuned individually to the individual process steps. It is thus possible with even greater reliability to prevent the sand/binder mixture from losing moisture in one of the aforementioned regions, drying out and contaminating the latter.
  • a development of the apparatus according to the invention can provide for the number of ultrasound atomizers to at least correspond to the number of tubular or hose lines, and for at least one ultrasound atomizer to be provided for each tubular or hose line.
  • the number of ultrasound atomizers to at least correspond to the number of tubular or hose lines, and for at least one ultrasound atomizer to be provided for each tubular or hose line.
  • a fan or a pressurized gas connection is arranged, in particular, above the liquid surface in the liquid reservoir in order to transport the moisture or the aerosol from the ultrasound atomizer(s) to the mixing apparatus and/or feed device and/or sand storage unit.
  • the aerosol could flow to the mixing apparatus and/or feed device and/or sand storage unit primarily in the case of relatively short lines on account of its own pressure, a fan or a pressurized gas connection can improve this flow or else make it possible for there to be a greater distance between the ultrasound atomizer and the regions of the apparatus to be supplied with moist air.
  • a fan and/or a pressurized gas connection can overcome differences in height between the ultrasound atomizer and said regions of the apparatus at the core shooting device.
  • the aerosol can also be conveyed upward, such that the ultrasound atomizer with the liquid reservoir can also be arranged at a greater depth, where sufficient space therefor is generally available.
  • it is advantageous in the case of such an arrangement that a condensate which possibly forms on the inner walls of the tube or of the hose in which the aerosol is transported can flow back downward into the liquid reservoir.
  • a modified embodiment of the invention may provide for the feed device to be at least one movable transport bucket.
  • a movable transport bucket as the feed device makes it possible to transport the sand/binder mixture even over relatively large distances from the mixing apparatus to the sand storage unit of the core or mold production apparatus.
  • FIGURE shows, in a schematized illustration
  • An apparatus for producing molds or cores, in the exemplary embodiment for producing cores for foundry purposes, has a mixing apparatus 20 with a mixing tool 22 for producing a mixture M by mixing molding compound or sand and a binder, a feed device 30 for conveying the mixture M to a sand storage unit 40 with a closure device 42 , and also a core or mold production apparatus 50 .
  • a moistening device 2 For moistening the air in the apparatus 1 , use is made of a moistening device 2 with two ultrasound atomizers 60 for water or for a liquid 71 containing water in particular and with a liquid reservoir 70 . With the aid of these ultrasound atomizers 60 , the liquid 71 can be atomized to form a fine aerosol. This aerosol is indicated by the two mushroom clouds 61 in the interior of the liquid reservoir 70 in the FIGURE.
  • An embodiment of the apparatus which is not shown may also provide, however, for three ultrasound atomizers 60 to be provided, of which a respective one is assigned to one of the three tubular lines 81 , 82 and 83 , such that at least one ultrasound atomizer is therefore available for each tubular line 81 , 82 and 83 for feeding the liquid into the regions to be moistened. The quantity of moisture can thus be measured and fed individually for the individual regions.
  • the moistening device 2 with the ultrasound atomizers 60 and the liquid reservoir 70 are arranged spatially separate from the mixing apparatus 20 , the feed device 30 and the sand storage unit 40 , but are connected to the regions to be moistened via tubular lines 81 , 82 and 83 , which reach directly from the liquid reservoir 70 into said regions of the apparatus 1 , where they supply mixture-free regions 21 , 31 and 41 with moist air.
  • the mixing apparatus 20 not only the mixing apparatus 20 but also the feed unit 30 and the sand storage unit 40 at least at times each have a mixture-free region 31 and 41 .
  • a fan 90 and also a pressurized gas connection 10 can additionally be seen in the liquid-free region of the liquid reservoir 70 .
  • Either the fan 90 or the pressurized gas connection 10 or preferably both serve for conveying and for transporting the aerosol produced by the ultrasound atomizers 60 via the tubular lines 81 , 82 and 83 to the mixing apparatus 20 , the feed device 30 and the sand storage unit 40 .
  • a modified embodiment of the apparatus 1 which is not shown in more detail can provide for the feed device 30 to be at least one movable transport bucket which can be moved between the mixing apparatus 20 and the sand storage unit 40 with the aid of a railway or with a crane, for example. This can be favorable particularly for crossing relatively large distances between the mixing apparatus 20 and the sand storage unit 40 .
  • the mixture M is mixed by means of a mixing apparatus 20 and fed to at least one sand storage unit 40 of a core or mold production apparatus 50 with the aid of a feed device 30 , wherein the mixture-free region 21 of the mixing apparatus 20 , at least at times, and/or the feed device 30 located between the mixing apparatus 20 and the core or mold production apparatus 50 and/or the sand storage unit 40 downstream of the feed device 30 and upstream of the core or mold production apparatus 50 are moistened or kept moist by means of a liquid 71 , wherein the liquid 71 which serves for moistening is atomized by at least one ultrasound atomizer 60 to form a suspendable aerosol and fed to the mixing apparatus 20 and/or to the feed device 30 and/or to the sand storage unit 40 via tubular lines 81 , 82 and 83 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
  • Casting Devices For Molds (AREA)
  • Nozzles (AREA)
  • Jigging Conveyors (AREA)
US13/695,446 2010-04-29 2011-04-08 Method and device by which moulding compound to be processed is kept moist during the production of moulds or cores Abandoned US20130042989A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102010018751.8 2010-04-29
DE102010018751.8A DE102010018751B4 (de) 2010-04-29 2010-04-29 Verfahren und Vorrichtung zur Herstellung von Formen oder Kernen insbesondere für Gießereizwecke
PCT/EP2011/001757 WO2011134598A1 (de) 2010-04-29 2011-04-08 Verfahren und vorrichtung zum feuchthalten von zu verarbeitendem formstoff bei der herstellung von formen oder kernen

Publications (1)

Publication Number Publication Date
US20130042989A1 true US20130042989A1 (en) 2013-02-21

Family

ID=44278628

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Application Number Title Priority Date Filing Date
US13/695,446 Abandoned US20130042989A1 (en) 2010-04-29 2011-04-08 Method and device by which moulding compound to be processed is kept moist during the production of moulds or cores

Country Status (15)

Country Link
US (1) US20130042989A1 (de)
EP (2) EP2563537B2 (de)
JP (1) JP5744183B2 (de)
CN (1) CN102869464A (de)
AU (1) AU2011247371B2 (de)
BR (1) BR112012027621A2 (de)
DE (2) DE102010018751B4 (de)
ES (2) ES2600508T5 (de)
HU (1) HUE043772T2 (de)
MX (1) MX2012012332A (de)
PL (1) PL3117928T3 (de)
RU (1) RU2557382C2 (de)
TR (1) TR201902510T4 (de)
UA (1) UA109784C2 (de)
WO (1) WO2011134598A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102601302A (zh) * 2012-03-26 2012-07-25 苏州明志科技有限公司 一种中间砂斗
WO2020093337A1 (zh) * 2018-11-08 2020-05-14 苏州明志科技有限公司 一种用于制芯机的加湿装置及加湿方法
CN112974736A (zh) * 2021-02-08 2021-06-18 苏州明志科技股份有限公司 一种保湿装置及保湿方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4304289A (en) * 1978-04-24 1981-12-08 Foundry Technology Inc. Apparatus for controlling the moisture content of foundry sand
US4329063A (en) * 1975-11-26 1982-05-11 Baker Perkins Holdings Ltd. Foundry sand mixing machine
US20040250977A1 (en) * 2001-09-08 2004-12-16 Bernhard Stauder Method and mould shooter for producing mould parts, such as casting cores, for casting moulds used to cast metal melt
DE202006010504U1 (de) * 2006-07-05 2006-08-31 Hydro Aluminium Mandl&Berger Gmbh Vorrichtung zum Druckbeaufschlagen von Kernsand in einer Kernschießmaschine und Kernschießmaschine
US20080190320A1 (en) * 2005-08-13 2008-08-14 Georg Fischer Automobilguss Gmbh Casting core mass
US20080277089A1 (en) * 2005-12-01 2008-11-13 Laempe & Mossner Gmbh Method and Device for Producing Moulds or Cores, in Particular for Foundry Purposes

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CH602172A5 (de) * 1975-10-10 1978-07-31 Fischer Ag Georg
DE2952403C2 (de) * 1979-12-27 1984-08-23 Alfelder Maschinen- und Modell-Fabrik Künkel, Wagner & Co KG, 3220 Alfeld Verfahren und Vorrichtung zum Aufbereiten, insb. Kühlen und Mischen von Formsand
SU956135A1 (ru) * 1980-11-05 1982-09-07 Всесоюзный Проектно-Технологический Институт Энергомашиностроения Устройство дл заливки модельного состава в форму
GB2089700A (en) * 1980-12-12 1982-06-30 Fischer Ag Georg Apparatus for the processing of granular material
IL97699A0 (en) * 1990-09-24 1992-06-21 Gaehler Franz Method and apparatus for reprocessing loose materials
FR2687942B1 (fr) * 1992-02-27 1997-08-14 Peugeot Procede et dispositif de moulage de noyaux en sable de fonderie contenant une resine durcissable, permettant d'eviter le colmatage de buses d'injection du sable.
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DE19545917B4 (de) * 1995-07-24 2004-09-16 Künkel-Wagner Prozesstechnologie GmbH Vorrichtung und Verfahren zur Bentonitdispergierung und zum Aufbereiten von Gießereiumlaufsänden
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4329063A (en) * 1975-11-26 1982-05-11 Baker Perkins Holdings Ltd. Foundry sand mixing machine
US4304289A (en) * 1978-04-24 1981-12-08 Foundry Technology Inc. Apparatus for controlling the moisture content of foundry sand
US20040250977A1 (en) * 2001-09-08 2004-12-16 Bernhard Stauder Method and mould shooter for producing mould parts, such as casting cores, for casting moulds used to cast metal melt
US20080190320A1 (en) * 2005-08-13 2008-08-14 Georg Fischer Automobilguss Gmbh Casting core mass
US20080277089A1 (en) * 2005-12-01 2008-11-13 Laempe & Mossner Gmbh Method and Device for Producing Moulds or Cores, in Particular for Foundry Purposes
DE202006010504U1 (de) * 2006-07-05 2006-08-31 Hydro Aluminium Mandl&Berger Gmbh Vorrichtung zum Druckbeaufschlagen von Kernsand in einer Kernschießmaschine und Kernschießmaschine

Also Published As

Publication number Publication date
WO2011134598A1 (de) 2011-11-03
DE102010018751B4 (de) 2015-08-13
EP2563537B1 (de) 2016-08-31
DE202011110835U1 (de) 2016-08-30
ES2713461T3 (es) 2019-05-21
ES2600508T3 (es) 2017-02-09
RU2012146853A (ru) 2014-06-10
JP5744183B2 (ja) 2015-07-01
HUE043772T2 (hu) 2019-09-30
MX2012012332A (es) 2013-03-05
ES2600508T5 (es) 2020-03-04
DE102010018751A1 (de) 2011-11-03
PL3117928T3 (pl) 2019-06-28
EP2563537A1 (de) 2013-03-06
AU2011247371B2 (en) 2014-08-14
EP3117928A1 (de) 2017-01-18
AU2011247371A1 (en) 2012-12-06
EP3117928B1 (de) 2019-01-09
CN102869464A (zh) 2013-01-09
UA109784C2 (uk) 2015-10-12
RU2557382C2 (ru) 2015-07-20
TR201902510T4 (tr) 2019-03-21
BR112012027621A2 (pt) 2016-08-09
EP2563537B2 (de) 2019-09-11
JP2013525116A (ja) 2013-06-20

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Date Code Title Description
AS Assignment

Owner name: LAEMPE & MOSSNER GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WINTGENS, RUDOLF;FALLER, MARTIN;REEL/FRAME:029215/0457

Effective date: 20121010

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION