US3601161A - Method and apparatus for dosing two types of molding sand into the molding box of a foundry mold - Google Patents

Method and apparatus for dosing two types of molding sand into the molding box of a foundry mold Download PDF

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Publication number
US3601161A
US3601161A US743399A US3601161DA US3601161A US 3601161 A US3601161 A US 3601161A US 743399 A US743399 A US 743399A US 3601161D A US3601161D A US 3601161DA US 3601161 A US3601161 A US 3601161A
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sand
intermediate container
molding
layer
discharge devices
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US743399A
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English (en)
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Erwin Buhrer
Emil Maurer
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Georg Fischer AG
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Assigned to GEORG FISCHER AKTIENGESELLSCHAFT reassignment GEORG FISCHER AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BAUMANN, DORIS HEIRS OF ERWIN BUHRER, DEC'D., BRANDLI, GRETE, BUHRER, DORA BERTHA, ROTH, LOTTE
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    • 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
    • B22C5/12—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose for filling flasks

Definitions

  • Kleeman ABSTRACT An apparatus for, and method of dosing two types of molding sand into a molding box of a foundry mold disposed beneath an intermediate container placed between a respective discharge device for each type of molding sand and the molding box. A relative movement occurs between at least one of the discharge devices and the intermediate container in order to continuously deposit a layer of a first type of molding sand into and substantially throughout the entire length of the intermediate container and with a width substantially corresponding to the width of the intermediate container.
  • .and apparatus for, dosing two types of molding sand into a molding box or flask of a foundry mold while using two sand silos with associated discharge devices and an intermediate container arranged beneath the discharge devices.
  • the floor of the intermediate container is formed by a louver or shutter closure, and further there is provided a filling frame arranged beneaththe intermediate container and which can be inserted upon the molding box to be filled.
  • molding sand which should form a faultless, edge-free or smooth negative of a pattern must possess a minimum plastic form'ability.
  • This minimum plastic formability is obtained by admixing a certain minimum quantity of bendable clay to the molding sand and by adding such a quantity of water thereto that, afie r mixing, it possesses the plastic condition required for carrying out the molding operation.
  • This properly prepared molding sand referred to in the foundry as facing'sand enablesamold-which has been produced therefrom to be faultlesly removed or lifted from the pattern, without the mold edges crumbling or breaking off and without a tearing away of mold conglomerates.
  • This minimum formability which the molding sand should poses for the above-explained reasons is, however, also necessary, in order to be able to. deposit cores withoutthe tearing away or breaking off of the edges of the sand.
  • plastic molding sand-prepared for molding is also extensively elastically deformable and, thus, when lifting the mold from the pattern it elastically relieves or expands, and that this molding sand requires a large amount'of compaction workwhich cannot be furnished for the lower parts of the pattern.
  • a further supply or feed apparatus which is espe cially provided for larger molds.
  • Such embodies a stationary feed container for facing sand which is disposed beneath a facing sand silo equipped with a bar grate.
  • the bar grate which isplaced into horizontal movement serves to discharge facing sand into the stationary feed container.
  • a further stationary feed container disposed beneath a backing sand silo is prefilled with backing sand.
  • FIG. I illustrates the beginning of an operating cycle, the intermediate container a and the discharge device 3 moving
  • Another, more specific object of the present invention relates to an improved method of, and apparatus for dosing two types ofmolding sand into the molding box or flask of a foundry mold in a manner which overcomes the aforementioned drawbacks.
  • a further significant object of the present invention relates to an improved method of reliably and economically preparing molding'boxes or flasks containing two different types of molding sand.
  • Yet a further noteworthy object of the present invention pertains .to an improved apparatus for filling molding boxes or the like with two types of molding sand, such apparatus being relatively simple in construction, extremely reliable in operation, quite easy to use, and capable of producing molding boxes which have been properly filled with two types of molding sand.
  • the inventive technique for dosing two I types of molding sand into a molding box of a foundry mold relies upon the features 6f moving an intermediate container and/or the discharge devices relative to one another.
  • the molding sand removed from a first silo is continuously distributed over the entire length of the intermediate container with a width corresponding to the width of such intermediate container, and with a shift in phase simultaneously or during a further relative movement between the intermediate container and the discharge device distributing molding sand removed from.
  • the second silo continuously over the entire length of the first layer of molding sand with a width corresponding to that of the intermediate container. Then the intermediate container is aligned with the filling frame placed upon the molding box, and thereafter the shutter-type closure of the intermediate container is opened.
  • FIGS. '1 to 4 schematically depict different intermediate positions during the operation of a first embodiment of inventive apparatus for dosing two types of molding sand into the molding box of a-foundry-mold;
  • FIG. 5 schematically illustrates an arrangement for closing the discharged quantity of sand from both silos
  • FIGS. 6 to 8 schematically depict different intermediate positions during the operation of a further exemplary embodiment of inventive apparatus for closing two types of molding sand into a molding box of a foundry mold.
  • FIGS. 1 to 4, inclusive there are illustrated different intermediate operational positions'of a first embodiment of inventive apparatus for dosing two .types of molding sand into a molding box 9 of a foundry mold.
  • This exemplary embodiment of apparatus incorporates two sand silos l and 2, each of which has operably associated therewith a suitable discharge device 3 and 4, respectively, here shown in the form of endless conveyor means.
  • An intermediate container or receptacle 5 the spatial position of which can be varied, is arranged beneath the discharge devices 3 and 4, as shown.
  • the floor or bottom of this intermediate container 5 is formed by a louveror shutter closure relative to one another.
  • the facing sand which is received from the silo l is continuously distributed over the Continuing, it will further be, understood that in order is reduce the fall height of thefacing sand delivered from the i conveyor band 3 intothe intermediate container 5, and to thereby prevent an undesired precompacting of this facing sand, there is advantageously provided a suitable slide plate or sheet 6 which extends from thedischarge end of the, conveyor band 3, the intermediate container 5 is displaced with ⁇ : uniform velocity or speed from the position of FIG. 1 towards the left until it has'reached the terminal position depicted in FIG. 2. As a result, a layer of loose facing sand of uniform height covers the entirefloor of the intermediate container 5. During this sand discharge operation, the slide' plate 6 does note change its position with respect to the conveyor band 3.
  • this end wall 50 is downwardly open up to a height a in order to allow entry of the slideplate 6.
  • this container is already disposed over the filling frame 8 which, in turn, has been placed upon a moulding box or flask 9. After opening the shutter closure mechanism 10 both of the superimposed layers of molding sand simultaneously drop out of the intermediate container 5 into the molding box 9.
  • the latter can be conically tapered at least at the lower region thereof, generally designated by reference character 51, which is to be filled with the facing sand.
  • FIGS. 6 to 8, inclusive schematically depict a further exemplary embodiment of inventive apparatus which, insofar as its structure is concerned, varies only to a slight extent from the inventive apparatus structure illustrated and described in connection with FIGS. 1 to 4. However, this embodiment of apparatus is operated partially different than the initial embodiment previously discussed.
  • FIG. 6 illustrates the beginning of an operating cycle, wherein the intermediate I container 5 is located at the left-hand position of FIG. 6 from which it is displaced towards the right thereof with simultaneous discharge of facing sand from the conveyor band 3, as shown.
  • the guide plate 7 extends for such a degree down into the intermediate container 5 towards the shutter closure mechanism 10 that it approximately contacts the upwardly directed surface of the previously deposited layer of facing sand.
  • the conveyor band 4 After a predetermined displacement of the intermediate container 5, the conveyor band 4 begins to simultaneously discharge the packing or backing sand out of the silo 2 onto the layer of facing sand which is already deposited in the intermediate container 5.
  • the guide plate 7 prevents the backing sand from depositing over the portion of the shutter closure mechanism 10 which has not yet been covered with facing sand.
  • the discharge of facing sand by means of the conveyor band 3 is interrupted ata predetermined spacing of the intermediate container 5 prior to its having reached its terminal position. Shortly prior to reaching the terminal position of the intermediate container 5 the discharge of backing or packing sand by means of the conveyor band 4 is also interrupted.
  • FIG. 8 there is depicted the terminal position of the intermediate container 5. It will be recognized that this intermediate container 5 has now been filled with both layers of molding sand and is disposed above or in alignment with the filling frame 8, the latter having been placed upon a molding box or flask 9, as shown.
  • the improvement comprising carrying out a relative movement between the discharge devices and the intermediate container while continuously depositing a layer of a first type of molding sand delivered from one of said sand silos until, by reason of said relative movement, said first type of molding sand has been deposited throughout the entire length of the intermediate container and with a width substantially corresponding to the width of the intermediate container, controlling the movement of said first type of molding sand from said one silo into said intermediate container to influence the formation of said first layer of sand within said intermediate container, depositing a second layer of molding sand received from the second sand silo continuously onto and over the entire length of the first layer of molding sand and with a width which substantially corresponds to that of the intermediate container while carrying out a relative movement between the discharge devices and the intermediate container, then bringing the intermediate container into overlying relationship with respect to the filling frame which has been placed upon
  • both conveyor bands 3 and 4 can be individually or conjointly regulated, as desired, by appropriately controlling the relevant conveyor speed of travel, for instance.
  • a schematically depicted suitable drive means D can be operably associated with the intermediate container 5, for instance as shown in FIG. 1, in order to displace such container back and forth through a substantially linear path of travel.
  • the step of flowing the released facing sand along the incline being carried out continuously while maintaining the lower end of the incline within the intermediate container and while maintaining the angle of the incline such that the facing 'sand flowing therealong is discharged gently onto the bottom of the intermediate container,
  • first and second sand supply means located above said support means and each including a discharge device effective, when operated, to continuously release sand from the respective one of said sand supply means;
  • an intermediate container located above the position occupied by a mold box when the mold box is supported by said support means, said intermediate container having a bottom capable of being closed to retain sand in the container and opened to release sand downwardly therefrom; sand-flow-directing means disposed between said intermediate container and said discharge devices; and
  • said sand-flow-directing means including means operative to deposit sand from one of said discharge devices onto the bottom of said intermediate container along a line extending transversely of the direction of such relative horizontal movement and at least substantially over the full width of said intermediate container during such relative horizontal movement, whereby the sand from said one discharge device is caused to progressively form a first sand layer on the bottom of said intermediate container.
  • said intermediate container comprises two end walls spaced apart in the direction of said relative horizontal movement, one of said end walls extending upwardly for only a relatively short distance from the bottom of said intermediate container, whereby said means defining said inclined surface can enter said intermediate container as said container is moved horizontally relative to said sandflow-directing means, said inclined surface being movable to a vertical position such as to cooperate with said one end wall to retain the deposited sand within said intermediate container.
  • said intermediate container is arranged for horizontal movement from a first position aligned above said support means to a second position displaced horizontally therefrom and then back to said first position;
  • said discharge devices are spaced apart in the direction of said horizontal movement; and said intermediate container comprises two end walls which are spaced apart in the direction of said horizontal movement, said inclined surface being disposed to deposit sand adjacent the one of said end walls nearer said second position when said intermediate container is located at said first position preparatory to movement from said first position to said second position,
  • the other of said discharge devices being located near said one discharge device and arranged to release sand from its respective sand supply means toward said surface during horizontal movement of said intermediate container from said second position back to said first position.
  • the means defining'said inclined surface is movable to bring said inclined surface into a vertical position at said one end wall when said intermediate container has reached said second position.
  • said discharge devices each comprise a horizontal endless conveyor; the means defining said inclined surface is a plate; and said one end wall extends upwardly from the bottom of said intermediate container for only a relatively short distance, whereby said plate can occupy a position slanting from said first discharge device downwardly across the position of said one end wall and into said intermediate container when the latter is in said first position preparatory to deposit of sand therein.
  • said sand-flow-directing means comprises means defining a second surface, said second surface being generally upright, located between said inclined surface and the other of said discharge devices, and disposed to direct said sand from said other discharge device into said intermediate container, whereby sand from both of said discharge devices can be deposited in said intermediate container substantially simultaneously, while said container travels from said second position back to said first position, with said second surface directing sand from said other discharge device onto the sand already deposited from said inclined surface.
  • a method for dosing two different types of molding sand into a molding box of a foundry mold using two sand silos and an intermediate container for preparing sand to be filled into the mold box comprising discharging a first type of sand from one of the silos and directing the discharged sand onto the bottom of the intermediate container along a limited area extending across the intermediate container, while effecting relative horizontal movement between the intermediate container and said limited area in a direction transverse to the limited area, and thereby progressively depositing a layer of said first type of sand on the bottom of the intermediate container; depositing a second type of sand from the other of the silos and directing the discharged sand onto the deposited layer of said first type of sand to provide an overlying layer of said second type of sand; and then conjointly and simultaneously releasing the superimposed layers of said sand from the intermediate container into the mold box.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
US743399A 1967-08-16 1968-07-09 Method and apparatus for dosing two types of molding sand into the molding box of a foundry mold Expired - Lifetime US3601161A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1150967A CH462392A (de) 1967-08-16 1967-08-16 Verfahren zum Dosieren von zwei Formsandsorten in einen Formkasten einer Giessereiform

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US3601161A true US3601161A (en) 1971-08-24

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US743399A Expired - Lifetime US3601161A (en) 1967-08-16 1968-07-09 Method and apparatus for dosing two types of molding sand into the molding box of a foundry mold

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US (1) US3601161A (en:Method)
AT (1) AT282087B (en:Method)
BE (1) BE718083A (en:Method)
CH (1) CH462392A (en:Method)
DE (1) DE1758414B1 (en:Method)
FR (1) FR1573548A (en:Method)
GB (1) GB1224239A (en:Method)
LU (1) LU56551A1 (en:Method)
SE (1) SE328095B (en:Method)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181171A (en) * 1978-05-22 1980-01-01 Hitachi Metals, Ltd. Molding sand feeding device
US4357984A (en) * 1979-11-01 1982-11-09 Georg Fischer Aktiengesellschaft Method and apparatus for producing a foundry mold
WO2005113176A1 (en) * 2004-05-19 2005-12-01 Disa Industries A/S Moulding sand supply apparatus and method
RU2313417C2 (ru) * 2004-05-19 2007-12-27 Диса Индастриз А/С Устройство и способ подачи формовочного песка
US20140224152A1 (en) * 2012-05-17 2014-08-14 Kimura Chuzosho Co., Ltd. Molding sand for three dimensional laminate molding
US10233032B1 (en) * 2018-07-18 2019-03-19 Alex Xie Material delivery method and apparatus for vertical distribution
US10399257B1 (en) 2018-07-18 2019-09-03 Alex Xie Controlled vertical material distribution

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2653788C2 (de) * 1976-11-26 1981-08-27 Bühler, Eugen, Dipl.-Ing., 8871 Burtenbach Verfahren und Vorrichtung zum Herstellen von Gießformen aus bindemittelhaltigem Formsand
DE3317196A1 (de) * 1983-05-11 1984-11-22 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giessereiformsand
DE4100438C1 (en) * 1990-01-23 1991-07-25 Gerhard 5905 Freudenberg De Mueller-Spaeth Filling foundry mould with sand - supplying from bunker into screening arrangement, and conveying finer fraction to pattern and coarser fraction to fill mould
DE4038173A1 (de) * 1990-11-30 1992-06-04 Badische Maschf Gmbh Verfahren und vorrichtung zum herstellen von giessformen
CN106629108A (zh) * 2016-11-29 2017-05-10 广东技术师范学院 一种工业原料定量投放装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3088713A (en) * 1960-05-09 1963-05-07 Armstrong Cork Co Blending method
US3200449A (en) * 1961-12-22 1965-08-17 Osborn Mfg Co Contour squeeze molding machine
US3216464A (en) * 1963-02-11 1965-11-09 Armstrong Cork Co Method and apparatus for fabricating one-dimensionally graded devices
US3326248A (en) * 1963-09-09 1967-06-20 Greenawalt Sintering Co Inc Charging apparatus for sinter pan
CA774305A (en) * 1967-12-26 L. Horst Robert Admittance meter and feeding system controlled thereby

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA774305A (en) * 1967-12-26 L. Horst Robert Admittance meter and feeding system controlled thereby
US3088713A (en) * 1960-05-09 1963-05-07 Armstrong Cork Co Blending method
US3200449A (en) * 1961-12-22 1965-08-17 Osborn Mfg Co Contour squeeze molding machine
US3216464A (en) * 1963-02-11 1965-11-09 Armstrong Cork Co Method and apparatus for fabricating one-dimensionally graded devices
US3326248A (en) * 1963-09-09 1967-06-20 Greenawalt Sintering Co Inc Charging apparatus for sinter pan

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4181171A (en) * 1978-05-22 1980-01-01 Hitachi Metals, Ltd. Molding sand feeding device
US4357984A (en) * 1979-11-01 1982-11-09 Georg Fischer Aktiengesellschaft Method and apparatus for producing a foundry mold
WO2005113176A1 (en) * 2004-05-19 2005-12-01 Disa Industries A/S Moulding sand supply apparatus and method
US20070137829A1 (en) * 2004-05-19 2007-06-21 Knudsen Soren E Moulding sand supply apparatus and method
RU2313417C2 (ru) * 2004-05-19 2007-12-27 Диса Индастриз А/С Устройство и способ подачи формовочного песка
US20140224152A1 (en) * 2012-05-17 2014-08-14 Kimura Chuzosho Co., Ltd. Molding sand for three dimensional laminate molding
US9796015B2 (en) * 2012-05-17 2017-10-24 Kimura Chuzosho Co., Ltd. Molding sand for three dimensional laminate molding
US10233032B1 (en) * 2018-07-18 2019-03-19 Alex Xie Material delivery method and apparatus for vertical distribution
US10399257B1 (en) 2018-07-18 2019-09-03 Alex Xie Controlled vertical material distribution

Also Published As

Publication number Publication date
LU56551A1 (en:Method) 1968-10-30
CH462392A (de) 1968-09-15
GB1224239A (en) 1971-03-03
FR1573548A (en:Method) 1969-07-04
DE1758414B1 (de) 1970-05-21
SE328095B (en:Method) 1970-09-07
AT282087B (de) 1970-06-10
BE718083A (en:Method) 1968-12-16

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Owner name: GEORG FISCHER AKTIENGESELLSCHAFT, MUHLENTALSTRASSE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:BUHRER, DORA BERTHA;BRANDLI, GRETE;ROTH, LOTTE;AND OTHERS;REEL/FRAME:003843/0200

Effective date: 19801230