EP2907601A1 - Machine et procédé de fabrication de noyaux de sable - Google Patents

Machine et procédé de fabrication de noyaux de sable Download PDF

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Publication number
EP2907601A1
EP2907601A1 EP15382044.4A EP15382044A EP2907601A1 EP 2907601 A1 EP2907601 A1 EP 2907601A1 EP 15382044 A EP15382044 A EP 15382044A EP 2907601 A1 EP2907601 A1 EP 2907601A1
Authority
EP
European Patent Office
Prior art keywords
filtration plate
cleaning means
sand
blowing chamber
molding box
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.)
Granted
Application number
EP15382044.4A
Other languages
German (de)
English (en)
Other versions
EP2907601B1 (fr
Inventor
Luis Alfonso Fernandez Orive
Alesander Olea Abarrategi
Ekaitz Barrasa Artamendi
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.)
Loramendi S Coop
Original Assignee
Loramendi S Coop
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 Loramendi S Coop filed Critical Loramendi S Coop
Publication of EP2907601A1 publication Critical patent/EP2907601A1/fr
Application granted granted Critical
Publication of EP2907601B1 publication Critical patent/EP2907601B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Definitions

  • the present invention relates to machines and methods for manufacturing sand cores.
  • a machine for manufacturing sand cores comprises a molding box in which the core is shaped, a blowing chamber, a gassing element (or chamber), a blowing assembly facing the molding box, and a filtration plate arranged in the blowing assembly and facing the molding box.
  • the molding box generally remains stationary while manufacturing the core, the blowing and gassing chamber being what moves.
  • the blowing assembly and filtration plate also remain stationary and are generally facing the molding box at a certain distance, the blowing or gassing chamber, whichever is appropriate, being arranged between them.
  • the blowing chamber can be arranged in at least two positions with respect to the molding box. In a loading position it is filled with sand, and in an unloading position, in which it is arranged between the filtration plate and the molding box, said sand is unloaded into the molding box for manufacturing the core.
  • the blowing assembly is suitable for injecting air through the filtration plate towards the blowing chamber, while at the same time generating suction for suctioning out at least part of the air that has been injected. Once the sand has been unloaded from the blowing chamber, said blowing chamber is moved to its loading position to be filled with sand again.
  • the gassing element (or chamber) can be arranged in at least two positions with respect to the molding box. While the blowing chamber is in the unloading position, the gassing element is in a standby position. When the blowing chamber leaves the unloading position, the gassing element moves to a working position, preferably on the molding box and injects or blows gas towards the molding box in order to harden the core.
  • suction is also generated when unloading the sand into the molding box, and this is designed to relieve the excess pressure generated in the molding box, but in addition to suctioning air it also attracts sand.
  • the filtration plate prevents most of the attracted sand from being suctioned out, but in turn part of the sand that reaches it stays adhered thereto and ends up hardening, which can be pernicious in normal machine operation because it can eventually cover the filtration plate entirely, or at least greatly deteriorate both the blowing capacity (injecting air) and the suctioning capacity.
  • operators must change the filtration plate often, which at the very least involves consuming a certain amount of time, and accordingly affects the core manufacture productivity.
  • One object of the invention is to provide a machine for manufacturing sand cores as described below.
  • the machine for manufacturing sand cores of the invention comprises a molding box in which the core is shaped, a blowing chamber, a gassing element, a blowing assembly facing the molding box, and a filtration plate arranged in the blowing assembly and facing the molding box.
  • the blowing chamber is arranged in a loading position in which it is at least partially filled with sand, and in an unloading position between the blowing assembly and the molding box for unloading the sand into the molding box.
  • the gassing element is arranged in a working position between the blowing assembly and the molding box once the blowing chamber has left the unloading position for gassing the sand present in the molding box.
  • the machine further comprises cleaning means which are suitable for injecting a cleaning agent against said filtration plate once the blowing chamber has left the unloading position, such that the sand adhered to the filtration plate is detached.
  • cleaning means which are suitable for injecting a cleaning agent against said filtration plate once the blowing chamber has left the unloading position, such that the sand adhered to the filtration plate is detached.
  • the frequency of replacing the filtration plate is thereby significantly reduced, so productivity of said machine is increased in a simple manner.
  • Another object of the invention is to provide a method for manufacturing sand cores as described below.
  • a blowing chamber is at least partially filled with sand, the blowing chamber moves until it is arranged between a molding box and a blowing assembly comprising a filtration plate, in an unloading position where said sand is unloaded into a molding box, air is blown against the blowing chamber to help unload the sand by means of the blowing assembly, and at least part of said air is simultaneously suctioned out, the blowing chamber moves in order to be evacuated from the unloading position, a gassing element is arranged between the molding box and the blowing assembly, and the sand present in the molding box is gassed with the gassing element so that said sand hardens.
  • a first aspect of the invention relates to a machine 100 for manufacturing sand cores, such as the one shown by way of example and schematically in Figures 1 to 3
  • a second aspect of the invention relates to a method for manufacturing sand cores which can be implemented in the machine 100 of the first aspect of the invention, in any of its embodiments and/or configurations.
  • the machine 100 comprises a molding box 1 in which the core is shaped, comprising a cavity 10 with the desired core shape.
  • sand is poured into the cavity 10 of the molding box 1 and said sand is subsequently gassed to harden it, such that a body of sand corresponding to the core is obtained, and it is subsequently evacuated from the molding box 1.
  • the machine 100 comprises a blowing chamber 2 responsible for pouring sand into the molding box 1.
  • the blowing chamber 2 is positioned in a loading position P1 in which it is at least partially filled with sand, preferably through a hopper 8 or the like, as shown in Figure 1 .
  • the blowing chamber 2 subsequently moves to an unloading position P2 between a blowing assembly 4 of the machine 100 and the molding box 1, as shown in Figure 2 , preferably by means horizontal movement.
  • the blowing chamber 2 With the blowing chamber 2 in the unloading position P2, the sand is unloaded into the molding box 1 by gravity, and to that end the blowing chamber 2 comprises a gate (not depicted in the drawings) that opens to allow the sand to fall into the box.
  • the filtration plate 5 comprises a plurality of orifices 50 through which air or gas passes and is preferably fixed to the blowing assembly 4. At the same time, suction is generated from the blowing assembly 4 through the filtration plate 5 for suctioning out at least part of the air that has been injected or is being injected. Once all the sand (or the required sand) has been unloaded, the blowing chamber 2 is moved again to its loading position P1 in order to commence a new cycle.
  • the filtration plate 5 is arranged in the blowing assembly 4 and is a mesh (or has a mesh-like configuration).
  • a gassing element 3 of the machine 100 is moved to a working position Pg between the blowing assembly 4 and the molding box 1, i.e., the position shown in Figure 1 , and the sand of the cavity 10 of the molding box 1 is gassed by means of said gassing element 3 through a gassing conduit 30 in order to harden it, so the gassing element 3 receives the gas from outside the machine 100 or from a receptacle of the machine 100 in which said gas is stored.
  • the gassing element 3 moves from its working position Pg to a standby position P shown in Figure 2 .
  • chambers 2 and 3 move together as a result of a common structure 7, although in other embodiments both chambers 2 and 3 can move independently from one another.
  • the machine 100 of the invention therefore further comprises cleaning means 6 for cleaning the filtration plate 5.
  • the cleaning means 6 are suitable for injecting a cleaning agent against the filtration plate 5 once the blowing chamber 2 has left the unloading position P2, and thereby causing, with the strength of the cleaning agent, at least part of the sand adhered to the filtration plate 5 to become detached therefrom.
  • the cleaning means 6 comprise at least one nozzle 60 through which the cleaning agent comes out.
  • the cleaning means 6 are preferably arranged facing the filtration plate 5, between said filtration plate 5 and the molding box 1, the cleaning agent being injected against the filtration plate 5 from bottom to top.
  • the cleaning agent is preferably injected under pressure, and it can be a gas or another material such as dry ice, for example, though it is preferably compressed air.
  • the cleaning means 6 are attached to the common structure 7 at a point between the blowing chamber 2 and the gassing element 3.
  • the two chambers 1 and 2 move together, and when they move so that the blowing chamber 2 can leave its unloading position P2 and the gassing element 3 can be arranged in its gassing position Pg, the cleaning means 6 also move, and there is a moment in which they are arranged under the filtration plate 5 (see Figure 3 ), and this is the moment that is used for injecting the cleaning agent and thereby cleaning said filtration plate 5 at least in part.
  • Gas etching can only be activated in that moment or it can be activated beforehand in order to assure that, when the time comes, the filtration plate 5 will be etched with the cleaning agent. If the time during which the filtration plate 5 is exposed to the cleaning agent is not enough to clean it, movement of the gassing element 3 to its working position Pg can be delayed by interrupting its movement (and therefore that of the blowing chamber 2 as well) for the necessary or required time so that the cleaning means 6 perform the required cleaning, movement being activated again once said time has elapsed.
  • the cleaning means 6 are fixed to the gassing element 3, it being arranged on said gassing element 3.
  • the cleaning operation can therefore be performed while the sand of the molding box 1 is being gassed with the gassing element 3, which is generally enough time to perform the required cleaning of the filtration plate 5, because the cleaning means 6 are facing the filtration plate 5 while gassing takes place.
  • the cleaning means 6 are attached to the blowing assembly 4 with freedom of rotation, and when the blowing chamber 2 moves to leave the unloading position P2, the cleaning means 6 rotate in order to be positioned opposite the filtration plate 5 and in order to thereby perform the cleaning operation.
  • This embodiment has the aforementioned drawback of having to delay or interrupt movement of the gassing element 3 towards its working position Pg.
  • the cleaning means 6 can comprise a structure 61 and a plurality of nozzles 60 fixed to said structure 61, as shown by way of example in Figure 4 , such that the nozzles 60 remain stationary during the cleaning operation; or they can comprise at least one nozzle 60 attached to the structure 61 with freedom of movement, causing the repetitive movement of said nozzle 60 in both directions to cover the entire width of the filtration plate 5, while at the same time the cleaning agent is injected against said filtration plate 5 by means of said nozzle 60.
  • the machine 100 can further comprise suction means arranged below the filtration plate 5 and suitable for suctioning out at least the sand that is detached from or cleaned off the filtration plate 5 due to the action of cleaning means 6, although in other cases the sand could fall by gravity, for example, avoiding use of suction means.
  • the suction means comprise means responsible for generating suction (not depicted in the drawings), a suction conduit 90 through which said sand reaches its destination (a receptacle or bin for evacuation, for example) and a suction valve 91 for opening or closing the passage through the suction conduit 90.
  • the second aspect of the invention relates to a method for manufacturing sand cores and can be implemented in any of the embodiments of the machine 100 of the first aspect of the invention.
  • the molding box 1 and blowing assembly 4 remain stationary, whereas the blowing chamber 2 and the gassing element 3 move in order to be arranged between said molding box 1 and said blowing assembly 4, specifically in order to be arranged on and facing the molding box 1.
  • the method of the invention comprises the following steps:
  • cleaning means 6 are arranged facing the filtration plate 5 and a cleaning agent is injected against said filtration plate 5 by the cleaning means 6. Therefore, after each sand unloading operation for unloading sand into the molding box 1, possible sand adhered to the filtration plate 5 primarily due to suction can be cleaned off, the frequency of having to replace said filtration plate 5 with a new one (or at least with a clean one) being decreased, productivity of the machine 100 thereby being increased.
  • a cleaning operation is preferably performed every time a sand unloading operation is performed, although it could have a different frequency if required.
  • the cleaning agent is preferably injected under pressure, and it can be a gas or another material such as dry ice, for example, although it is preferably compressed air.
  • the blowing chamber 2 and the gassing element 3 are attached to one another by means of a common structure 7, such that they move simultaneously and together.
  • the cleaning means 6 are attached to said common structure 7 at a point between the blowing chamber 2 and the gassing element 3, also moving integrally with the blowing chamber 2 and the gassing element 3.
  • movement of the gassing element 3 from the standby position P to the working position Pg can be done continuously or discontinuously.
  • the cleaning means 6 inject the cleaning agent acting against the filtration plate 5 when said cleaning means 6 are facing it (the moment in which injection of the cleaning agent is activated is irrelevant, it must simply be assured that when the cleaning means 6 pass below the filtration plate 5, said injection must be activated in order to be able to perform cleaning). If the time during which the cleaning means 6 act on the filtration plate 5 is enough to clean it, movement is done continuously, otherwise it is done discontinuously, the movement being interrupted during a predetermined cleaning time while said cleaning means 6 inject the cleaning agent against the filtration plate 5, said cleaning time being equal to or greater than that time which has previously been considered necessary.
  • the cleaning means 6 are fixed to the gassing element 3 and arranged on said gassing element 3 such that they move integrally with said gassing element 3.
  • the cleaning operation can therefore be performed while the sand of the molding box 1 is being gassed with the gassing element 3, which is generally enough time to perform the required cleaning of the filtration plate 5, because the cleaning means 6 are facing the filtration plate 5 while gassing takes place.
  • the cleaning means 6 are positioned below the filtration plate 5 while at the same time the gassing element 3 is positioned in the working position Pg.
  • the cleaning means 6 are attached to the blowing assembly 4 with freedom of rotation, and when the blowing chamber 2 moves to leave the unloading position P2, the cleaning means 6 rotate in order to be positioned opposite the filtration plate 5 and in order to thereby perform the cleaning operation.
  • This embodiment has the drawback discussed above for the first embodiment as regards having to delay or interrupt movement of the gassing element 3 towards its working position Pg. Once the cleaning operation is performed, said cleaning means 6 return to their original position to allow the gassing element 3 to be positioned in the working position Pg.
  • the cleaning means 6 can comprise a structure 61 and a plurality of nozzles 60 fixed to said structure 61, such that the nozzles 60 remain stationary during the cleaning operation; or they can comprise at least one nozzle 60 attached to the structure 61 with freedom of movement.
  • the repetitive movement of said nozzle 60 in both directions is caused in order to cover the entire width of the filtration plate 5, while at the same time the cleaning agent is injected against said filtration plate 5 by means of said nozzle 60.
  • the sand that is detached from or cleaned off the filtration plate 5 due to the action of the cleaning means 6 can be suctioned out by suction means during the method of the invention.
  • This operation can take place continuously, although it is preferably activated during the time in which the cleaning means 6 are acting on the filtration plate 5.
  • the suction means comprise means responsible for generating suction (not depicted in the drawings), a suction conduit 90 through which said sand reaches its destination (a receptacle for evacuation, for example) and a suction valve 91 for opening or closing the passage through the suction conduit 90, and the means responsible for generating suction are acted on and said suction valve 91 is acted on, when required, in order to allow or prohibit said suction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP15382044.4A 2014-02-11 2015-02-10 Machine et procédé de fabrication de noyaux de sable Active EP2907601B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ES201430184A ES2542894B1 (es) 2014-02-11 2014-02-11 Máquina y método para la fabricación de machos de arena

Publications (2)

Publication Number Publication Date
EP2907601A1 true EP2907601A1 (fr) 2015-08-19
EP2907601B1 EP2907601B1 (fr) 2019-04-10

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ID=52544420

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EP15382044.4A Active EP2907601B1 (fr) 2014-02-11 2015-02-10 Machine et procédé de fabrication de noyaux de sable

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EP (1) EP2907601B1 (fr)
ES (2) ES2542894B1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3272441A1 (fr) 2016-07-19 2018-01-24 Loramendi, S.COOP. Machine de fabrication de noyaux en sable
EP3581295A1 (fr) 2018-06-13 2019-12-18 Loramendi, S.COOP. Procédé et installation de fabrication de noyaux de sable
US11192173B2 (en) 2017-10-17 2021-12-07 Magma Giessereitechnologie Gmbh Core shooting apparatus and method for controlling core shooting apparatus
RU2783976C2 (ru) * 2018-06-13 2022-11-22 Лораменди, С. Кооп. Способ и установка для изготовления песчаных литейных стержней

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059294A (en) * 1959-05-04 1962-10-23 Gen Motors Corp Apparatus for making foundry cores and molds
DE2422407A1 (de) * 1973-05-09 1974-12-12 Mec Fond Spa Formkopf und verfahren zur herstellung von giessformen oder giesskern
CH593109A5 (en) * 1975-06-03 1977-11-30 Hitachi Metals Ltd Core-blowing machine using the hot box process - for high speed automatic prodn. of sand cores
JPS58163548A (ja) * 1982-03-24 1983-09-28 Toyota Motor Corp 鋳型造型機
US4572273A (en) * 1983-10-26 1986-02-25 Naniwa Products Co. Ltd. Blow plate and/or blow nozzle automatic cleaning device
GB2193916A (en) * 1986-08-08 1988-02-24 Agustin Arana Erana Cleaning the sand residues in core blowing machines
GB2216446A (en) * 1988-03-25 1989-10-11 Agustin Arana Erana Apparatus for changing and cleaning blowing plates in core blowing machines.
DE4327041C1 (de) * 1993-08-12 1994-06-30 Hottinger Adolf Masch Vorrichtung zum Reinigen von Werkzeugen in Gießereimaschinen
DE4322986C1 (de) * 1993-07-09 1994-07-07 Hottinger Adolf Masch Vorrichtung und Verfahren zur Schußhaubenreinigung bei der Herstellung gießfertiger Masken bzw. Kernpakete
EP0756909A1 (fr) * 1995-08-02 1997-02-05 Loramendi, S.A. Système de changement et de nettoyage pour une plaque de soufflage
US20120279674A1 (en) 2011-04-16 2012-11-08 Luber Gmbh Method for replacement of a filter plate of a core shooter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0780037B2 (ja) * 1990-02-23 1995-08-30 株式会社浪速製作所 下金型固定式水平割鋳型造型機

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3059294A (en) * 1959-05-04 1962-10-23 Gen Motors Corp Apparatus for making foundry cores and molds
DE2422407A1 (de) * 1973-05-09 1974-12-12 Mec Fond Spa Formkopf und verfahren zur herstellung von giessformen oder giesskern
CH593109A5 (en) * 1975-06-03 1977-11-30 Hitachi Metals Ltd Core-blowing machine using the hot box process - for high speed automatic prodn. of sand cores
JPS58163548A (ja) * 1982-03-24 1983-09-28 Toyota Motor Corp 鋳型造型機
US4572273A (en) * 1983-10-26 1986-02-25 Naniwa Products Co. Ltd. Blow plate and/or blow nozzle automatic cleaning device
GB2193916A (en) * 1986-08-08 1988-02-24 Agustin Arana Erana Cleaning the sand residues in core blowing machines
GB2216446A (en) * 1988-03-25 1989-10-11 Agustin Arana Erana Apparatus for changing and cleaning blowing plates in core blowing machines.
DE4322986C1 (de) * 1993-07-09 1994-07-07 Hottinger Adolf Masch Vorrichtung und Verfahren zur Schußhaubenreinigung bei der Herstellung gießfertiger Masken bzw. Kernpakete
DE4327041C1 (de) * 1993-08-12 1994-06-30 Hottinger Adolf Masch Vorrichtung zum Reinigen von Werkzeugen in Gießereimaschinen
EP0756909A1 (fr) * 1995-08-02 1997-02-05 Loramendi, S.A. Système de changement et de nettoyage pour une plaque de soufflage
US20120279674A1 (en) 2011-04-16 2012-11-08 Luber Gmbh Method for replacement of a filter plate of a core shooter

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3272441A1 (fr) 2016-07-19 2018-01-24 Loramendi, S.COOP. Machine de fabrication de noyaux en sable
WO2018015589A1 (fr) 2016-07-19 2018-01-25 Loramendi, S.Coop. Machine de fabrication de noyaux de sable
KR20190046786A (ko) * 2016-07-19 2019-05-07 로라멘디, 에스.쿱. 모래 코어 제조 기계
US10471501B2 (en) 2016-07-19 2019-11-12 Loramendi, S. Coop. Sand core making machine
US11192173B2 (en) 2017-10-17 2021-12-07 Magma Giessereitechnologie Gmbh Core shooting apparatus and method for controlling core shooting apparatus
EP3581295A1 (fr) 2018-06-13 2019-12-18 Loramendi, S.COOP. Procédé et installation de fabrication de noyaux de sable
WO2019238997A1 (fr) 2018-06-13 2019-12-19 Loramendi, S. Coop Procédé et installation pour la fabrication de noyaux en sable étuvé
US11318528B2 (en) 2018-06-13 2022-05-03 Loramendi, S. Coop. Method and apparatus for making sand cores
RU2783976C2 (ru) * 2018-06-13 2022-11-22 Лораменди, С. Кооп. Способ и установка для изготовления песчаных литейных стержней

Also Published As

Publication number Publication date
ES2542894R1 (es) 2015-10-27
ES2542894A2 (es) 2015-08-12
ES2542894B1 (es) 2016-08-03
ES2720476T3 (es) 2019-07-22
EP2907601B1 (fr) 2019-04-10

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