EP0077511A1 - Process and device for separating castings and moulding sand - Google Patents

Process and device for separating castings and moulding sand Download PDF

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Publication number
EP0077511A1
EP0077511A1 EP82109365A EP82109365A EP0077511A1 EP 0077511 A1 EP0077511 A1 EP 0077511A1 EP 82109365 A EP82109365 A EP 82109365A EP 82109365 A EP82109365 A EP 82109365A EP 0077511 A1 EP0077511 A1 EP 0077511A1
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EP
European Patent Office
Prior art keywords
sand
lance
casting
fluid
medium
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.)
Ceased
Application number
EP82109365A
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German (de)
French (fr)
Inventor
Horst Dr. Kreikenbaum
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.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
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 Georg Fischer AG filed Critical Georg Fischer AG
Publication of EP0077511A1 publication Critical patent/EP0077511A1/en
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
    • B22D31/002—Cleaning, working on castings

Definitions

  • the present invention relates to a method for unpacking sand castings which are moved in a geometrically defined manner, and to an apparatus for carrying out the method.
  • bales of sand come out of the molding box onto a vibrating grate, the unpacking grate on which the sand is separated from the castings.
  • a system-related property of known systems is the conversion of an ordered system specified by the casting process into an unordered system, in which the castings are statistically oriented and distributed, and after the blasting process has been carried out, they have to be ordered manually in order to be able to be fed to further machining operations.
  • the object of the present invention is to propose a method and an apparatus for carrying out the method, by means of which the disadvantages of the vibrating grate are avoided. At the same time, it is also possible to unpack thin-walled castings without the risk of breakage and to transport them to other cleaning stations in a defined manner.
  • the method and the device according to the invention is applicable to sand casting which is produced by molding with and without a box.
  • sand bale 1 which is pressed out of a molding box and which surrounds a casting 2.
  • Lance tubes 4 are inserted into the sand bale at the level of the dividing level 3.
  • the lance tubes are hollow on the inside and have openings 5 in their outer surface at the tip.
  • the lance tubes are inserted into the sand bales up to the vicinity of the casting.
  • a fluid medium is introduced under pressure into the lance tubes.
  • the medium escapes through the openings 5 into the sand mass and detaches it from the casting.
  • the separation of the sand mass from the casting is made easier by the burnt-out layer. This layer immediately surrounds the casting and is crumbly.
  • a gaseous medium such as e.g. Air used. However, an air-steam mixture can also be used, and deflagrating gases or pressurized water can be used.
  • the geometry of the lance tube can be any.
  • the openings 5 can be arranged distributed along the lateral surface of the lance or can only be provided in the tip of the lance.
  • FIG. 2 shows, for example, a defined translatory movement of the cast sand bales 1, which are fed to the device serving the purpose of the method.
  • the arrows indicate the lance tubes as they engage in the sand bale or are pushed in as far as the casting.
  • another feed movement is also conceivable, e.g. a rotary.
  • the sprue 6 is freed of sand in the manner described using the lance tubes, so that the casting can be gripped at the sprue and transported to the cooling station. Then there is a slow cooling in the sand. The remaining bale around the casting is then removed with the help of further lance tubes when the casting reaches a temperature below the critical cooling temperature.
  • the lances penetrating the sand bales have an aligning effect with respect to the casting, so that castings that have changed their position in the cooling station due to the crumbling sand in height and lateral position can still be gripped.
  • the alignment effect is that the lance tubes penetrating the sand bale hold the castings in a certain position and move them in a translatory or rotary manner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)

Abstract

The process for separating castings (2) from sand packs (1) provides for the insertion of lance tubes (4) into the sand surrounding the casting (2). The lance tubes (4) are hollow on the inside and have bores (5) in the circumferential surface. The lance tube (4) is pressurised by means of a fluid medium. The pressure exerted by the medium has the effect of expelling the moulding sand. <IMAGE>

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zum Auspacken von Sandgussstücken, die geometrisch definiert bewegt werden, sowie auf eine Vorrichtung zur Durchführung des Verfahrens.The present invention relates to a method for unpacking sand castings which are moved in a geometrically defined manner, and to an apparatus for carrying out the method.

Ueblicherweise gelangen die Sandballen nach dem Ausdrücken aus dem Formkasten auf einen vibrierenden Rost, den Auspackrost auf dem der Sand von den Gussstücken abgetrennt wird.Usually, the bales of sand come out of the molding box onto a vibrating grate, the unpacking grate on which the sand is separated from the castings.

Bei den bisher bekannten Verfahren verlieren die von der Giess- und Formanlage her geordnet anfallenden Gussstücke in den Auspackstationen ihre geordnete Orientierung und werden weiterhin durch Schläge mechanisch belastet. Dabei besteht die Gefahr, dass die entformten noch warmen Gussstücke auf dem schwingenden Rost beschädigt werden. Insbesondere bei Temperrohguss besteht teilweise erhöhte Bruchgefahr.In the previously known methods, the castings obtained from the casting and molding system in the unpacking stations lose their orderly orientation and continue to be mechanically stressed by blows. There is a risk that the demolded, still warm castings will be damaged on the vibrating grate. There is an increased risk of breakage, particularly in the case of malleable cast iron.

Eine systembedingte Eigenschaft bekannter Anlagen ist die Ueberführung eines vom Giessprozess her vorgegebenen geordneten Systems in ein ungeordnetes System, bei dem die Gussstücke statistisch orientiert und verteilt werden, und nach erfolgtem Strahlprozess manuell geordnet werden müssen, um weiteren Bearbeitungsoperationen zugeführt werden zu können.A system-related property of known systems is the conversion of an ordered system specified by the casting process into an unordered system, in which the castings are statistically oriented and distributed, and after the blasting process has been carried out, they have to be ordered manually in order to be able to be fed to further machining operations.

Für das "soft-handling" von Temperrohguss sind bisher keine zuverlässigen Verfahren bekannt, die sicher einen Bruch vermeiden.So far, no reliable methods have been known for the "soft handling" of malleable cast iron, which are sure to avoid breakage.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren sowie eine Vorrichtung zur Durchführung des Verfahrens vorzuschlagen, mittels welchen die Nachteile des Schwingrostes vermieden werden. Gleichzeitig besteht die Möglichkeit auch dünnwandige Gussstücke ohne Bruchgefahr auszupacken und sie zu weiteren Putzstationen definiert zu transportieren.The object of the present invention is to propose a method and an apparatus for carrying out the method, by means of which the disadvantages of the vibrating grate are avoided. At the same time, it is also possible to unpack thin-walled castings without the risk of breakage and to transport them to other cleaning stations in a defined manner.

Das Verfahren und die Vorrichtung nach der Erfindung ist anwendbar auf Sandguss der nach Formverfahren mit und ohne Kasten hergestellt wird.The method and the device according to the invention is applicable to sand casting which is produced by molding with and without a box.

Diese Aufgaben werden erfindungsgemäss durch die Lehre der Ansprüche 1 und 4 gelöst.According to the invention, these objects are achieved by the teaching of claims 1 and 4.

Weitere vorteilhafte Ausgestaltungen und Merkmale ergeben sich aus den abhängigen Ansprüchen.Further advantageous configurations and features result from the dependent claims.

Anhand der Zeichnungen werden Ausführungsbeispiele der Erfindung näher erläutert.Exemplary embodiments of the invention are explained in more detail with reference to the drawings.

Es zeigen:

  • Fig. 1 einen Schnitt durch einen Sandballen vor Beginn des Entformungsvorganges nach der Erfindung, und
  • Fig. 2 eine schematische Anordnung der Zuführung der Sandballen zu der dem Verfahrenszweck dienenden Vorrichtung.
Show it:
  • Fig. 1 shows a section through a sand bale before the start of the demolding process according to the invention, and
  • Fig. 2 is a schematic arrangement of the supply of sand bales to the device serving the process purpose.

Die Fig. 1 zeigt einen aus einem Formkasten ausgedrückten Sandballen 1, der ein Gussstück 2 umschliesst. Auf der Höhe der Teilungsebene 3 werden Lanzenrohre 4 in den Sandballen eingeschoben. Die Lanzenrohre sind innen hohl und weisen an der Spitze Oeffnungen 5 in ihrer Mantelfläche auf. Die Lanzenrohre werden in den Sandballen, bis in die Nähe des Gussstückes hineingesteckt. Dann wird ein fluides Medium unter Druck in die Lanzenrohre eingeleitet. Das Medium entweicht durch die Oeffnungen 5 in die Sandmasse und löst diese vom Gussstück. Die Trennung der Sandmasse vom Gussstück wird durch die totgebrannte Schicht, erleichtert. Diese Schicht umgibt das Gussstück unmittelbar und ist bröckelig. Als fluides Medium wird vorzugsweise ein gasförmiges Medium wie z.B. Luft verwendet. Man kann sich jedoch auch eines Luft-Dampf-Gemisches bedienen, sowie verpuffende Gase oder Druckwasser verwenden.1 shows a sand bale 1 which is pressed out of a molding box and which surrounds a casting 2. Lance tubes 4 are inserted into the sand bale at the level of the dividing level 3. The lance tubes are hollow on the inside and have openings 5 in their outer surface at the tip. The lance tubes are inserted into the sand bales up to the vicinity of the casting. Then a fluid medium is introduced under pressure into the lance tubes. The medium escapes through the openings 5 into the sand mass and detaches it from the casting. The separation of the sand mass from the casting is made easier by the burnt-out layer. This layer immediately surrounds the casting and is crumbly. A gaseous medium such as e.g. Air used. However, an air-steam mixture can also be used, and deflagrating gases or pressurized water can be used.

Die Geometrie des Lanzenrohres kann beliebig sein. Die Oeffnungen 5 können entlang der Mantelfläche der Lanze verteilt angeordnet sein oder nur in der Spitze der Lanze vorgesehen sein.The geometry of the lance tube can be any. The openings 5 can be arranged distributed along the lateral surface of the lance or can only be provided in the tip of the lance.

Die Fig. 2 zeigt beispielsweise eine definierte translatorische Bewegung der abgegossenen Sandballen 1, die der dem Verfahrenszweck dienenden Vorrichtung zugeführt werden. Die Pfeile zeigen die Lanzenrohre an, wie sie in den Sandballen eingreifen bzw. bis zum Gussstück eingeschoben werden. Selbstverständlich ist auch eine andere Zuführbewegung denkbar z.B. eine rotatorische. Wird das Auspacken in verschiedenen Stufen vorgenommen, so wird mittels der Lanzenrohre der Anguss 6 auf die beschriebene Art vom Sand befreit, so dass das Gussstück am Anguss gefasst und zum Kühlbahnhof transportiert werden kann. Dann erfolgt eine langsame Abkühlung im Sand. Danach wird der Restballen um das Gussstück mit Hilfe weiterer Lanzenrohre entfernt, wenn das Gussstück eine Temperatur unterhalb der kritischen Abkühltemperatur erreicht. Die in den Sandballen eindringenden Lanzen weisen bezüglich des Gussstückes eine Ausrichtwirkung auf, so dass auch Gussstücke, die ihre Lage im Kühlbahnhof durch abbröckelnden Sand in Höhe und Seitenlage verändert haben, noch gefasst werden können. Die Ausrichtwirkung besteht darin, dass die in den Sandballen eindringenden Lanzenrohre die Gussstücke in einer bestimmten Position halten und translatorisch bzw. rotatorisch bewegen.2 shows, for example, a defined translatory movement of the cast sand bales 1, which are fed to the device serving the purpose of the method. The arrows indicate the lance tubes as they engage in the sand bale or are pushed in as far as the casting. Of course, another feed movement is also conceivable, e.g. a rotary. If unpacking is carried out in different stages, the sprue 6 is freed of sand in the manner described using the lance tubes, so that the casting can be gripped at the sprue and transported to the cooling station. Then there is a slow cooling in the sand. The remaining bale around the casting is then removed with the help of further lance tubes when the casting reaches a temperature below the critical cooling temperature. The lances penetrating the sand bales have an aligning effect with respect to the casting, so that castings that have changed their position in the cooling station due to the crumbling sand in height and lateral position can still be gripped. The alignment effect is that the lance tubes penetrating the sand bale hold the castings in a certain position and move them in a translatory or rotary manner.

Claims (9)

1. Verfahren zum Auspacken von Sandgussstücken, die geometrisch definiert bewegt werden, dadurch gekennzeichnet, dass mindestens ein Lanzenrohr in den das Gussstück umgebenden Sand eingeschoben wird und dass durch das Rohr ein Fluid geleitet wird, wobei der Sand durch das unter Druck aus Oeffnungen des Lanzenrohres ausströmende Fluid teilweise oder gänzlich weggeschleudert wird.1. A method for unpacking sand castings that are moved in a geometrically defined manner, characterized in that at least one lance tube is inserted into the sand surrounding the casting and that a fluid is passed through the tube, the sand being passed through the openings under pressure from the lance tube escaping fluid is partially or wholly thrown away. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass mehrere Lanzenrohre in den Sandballen definiert hineingeschoben werden.2. The method according to claim 1, characterized in that a plurality of lance tubes are pushed into the sand bale in a defined manner. 3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die in den Sandballen eindringenden Lanzenrohre (4) das Gussstück in einer definierten Lage halten und translatorisch bewegen.3. The method according to claim 2, characterized in that the lance tubes (4) penetrating into the sand bale hold the casting in a defined position and move it in translation. 4. Vorrichtung zur Durchführung des Verfahrens nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, dass die Lanzenrohre (4) in ihrer Mantelfläche mindestens eine Oeffnung (5) in Spitzennähe als Auslass für das fluide Medium aufweisen.4. Device for performing the method according to claims 1 to 3, characterized in that the lance tubes (4) in their lateral surface at least one opening (5) in the vicinity of the tip as an outlet for the fluid Have medium. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das fluide Medium ein gasförmiges Medium ist.5. The device according to claim 4, characterized in that the fluid medium is a gaseous medium. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das fluide Medium Luft ist.6. The device according to claim 5, characterized in that the fluid medium is air. 7. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das fluide Medium ein Luft-Dampf-Gemisch ist.7. The device according to claim 5, characterized in that the fluid medium is an air-steam mixture. 8. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass das fluide Medium Druckwasser ist.8. The device according to claim 4, characterized in that the fluid medium is pressurized water. 9. Vorrichtung nach einem der Ansprüche 4 bis 8, dadurch gekennzeichnet, dass die Adaption der Lanzenrohre (4) an die Geometrie des Gussstückes selbständig erfolgt.9. Device according to one of claims 4 to 8, characterized in that the adaptation of the lance tubes (4) to the geometry of the casting takes place independently.
EP82109365A 1981-10-16 1982-10-09 Process and device for separating castings and moulding sand Ceased EP0077511A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH661581 1981-10-16
CH6615/81 1981-10-16

Publications (1)

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EP0077511A1 true EP0077511A1 (en) 1983-04-27

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EP82109365A Ceased EP0077511A1 (en) 1981-10-16 1982-10-09 Process and device for separating castings and moulding sand

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4827583A (en) * 1984-10-27 1989-05-09 Korber Ag Apparatus for breaking up cast fixtures
GB2230720A (en) * 1989-04-29 1990-10-31 Maverex International Limited Removing moulding material particles from a casting
EP0753365A1 (en) * 1995-06-30 1997-01-15 Sintokogio Ltd. Apparatus for removing sand on a demolded cast
US6622775B2 (en) 2000-05-10 2003-09-23 Consolidated Engineering Company, Inc. Method and apparatus for assisting removal of sand moldings from castings
WO2004007120A1 (en) * 2002-07-11 2004-01-22 Consolidated Engineering Company, Inc. Method and apparatus for assisting removal of sand moldings from castings
WO2004007121A1 (en) * 2002-07-11 2004-01-22 Consolidated Engineering Company, Inc. Method and apparatus for assisting removal of sand moldings from castings
US7044974B2 (en) 2003-08-27 2006-05-16 Zimmer Technology, Inc. Hip prosthesis with a modular acetabular cup assembly
US8663547B2 (en) 2004-10-29 2014-03-04 Consolidated Engineering Company, Inc. High pressure heat treatment system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1557131A (en) * 1919-12-13 1925-10-13 Ludlum Steel Company Apparatus for removing sand cores from hollow drill rod by sand blast
US1804978A (en) * 1926-03-01 1931-05-12 Genoese John Safety paper
US2597896A (en) * 1949-03-17 1952-05-27 Ford Motor Co Casting core removal
US3627020A (en) * 1970-09-08 1971-12-14 Bangor Punta Operations Inc Mold-breaking device
US3749151A (en) * 1972-04-26 1973-07-31 Gen Motors Corp Vibratory shakeout apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1557131A (en) * 1919-12-13 1925-10-13 Ludlum Steel Company Apparatus for removing sand cores from hollow drill rod by sand blast
US1804978A (en) * 1926-03-01 1931-05-12 Genoese John Safety paper
US2597896A (en) * 1949-03-17 1952-05-27 Ford Motor Co Casting core removal
US3627020A (en) * 1970-09-08 1971-12-14 Bangor Punta Operations Inc Mold-breaking device
US3749151A (en) * 1972-04-26 1973-07-31 Gen Motors Corp Vibratory shakeout apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4827583A (en) * 1984-10-27 1989-05-09 Korber Ag Apparatus for breaking up cast fixtures
GB2230720A (en) * 1989-04-29 1990-10-31 Maverex International Limited Removing moulding material particles from a casting
EP0753365A1 (en) * 1995-06-30 1997-01-15 Sintokogio Ltd. Apparatus for removing sand on a demolded cast
US6622775B2 (en) 2000-05-10 2003-09-23 Consolidated Engineering Company, Inc. Method and apparatus for assisting removal of sand moldings from castings
WO2004007120A1 (en) * 2002-07-11 2004-01-22 Consolidated Engineering Company, Inc. Method and apparatus for assisting removal of sand moldings from castings
WO2004007121A1 (en) * 2002-07-11 2004-01-22 Consolidated Engineering Company, Inc. Method and apparatus for assisting removal of sand moldings from castings
CN1319683C (en) * 2002-07-11 2007-06-06 联合工程公司 Method and apparatus for assisting removal of sand moldings from castings
KR100828888B1 (en) * 2002-07-11 2008-05-09 콘솔리데이티드 엔지니어링 캄파니, 인크. Method for assisting removal of sand moldings from castings
US7044974B2 (en) 2003-08-27 2006-05-16 Zimmer Technology, Inc. Hip prosthesis with a modular acetabular cup assembly
US8663547B2 (en) 2004-10-29 2014-03-04 Consolidated Engineering Company, Inc. High pressure heat treatment system

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Inventor name: KREIKENBAUM, HORST, DR.