EP0140511B1 - Verfahren und Vorrichtung zum Entfernen von überflüssigem Material von Sandkernen - Google Patents

Verfahren und Vorrichtung zum Entfernen von überflüssigem Material von Sandkernen Download PDF

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Publication number
EP0140511B1
EP0140511B1 EP19840305627 EP84305627A EP0140511B1 EP 0140511 B1 EP0140511 B1 EP 0140511B1 EP 19840305627 EP19840305627 EP 19840305627 EP 84305627 A EP84305627 A EP 84305627A EP 0140511 B1 EP0140511 B1 EP 0140511B1
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EP
European Patent Office
Prior art keywords
particles
cores
conduit
stream
nozzle
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.)
Expired
Application number
EP19840305627
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English (en)
French (fr)
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EP0140511A1 (de
Inventor
Udo Kuehn
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.)
B and U Corp
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B and U Corp
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Filing date
Publication date
Application filed by B and U Corp filed Critical B and U Corp
Publication of EP0140511A1 publication Critical patent/EP0140511A1/de
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Publication of EP0140511B1 publication Critical patent/EP0140511B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/18—Finishing

Definitions

  • This invention relates generally to apparatus for finishing and cleaning molded articles by directing particulate material against the rough moulded article. Impeller systems for directing metal shot against cast metal articles for cleaning the articles are well known.
  • the present invention relates more specifically to the finish cleaning of molded sand cores which are made by molding a mixture of sand and a binder, to form a core that may be of complex shape having holes, projections, notches, and other irregularly shaped areas.
  • Such articles are far more delicate than the articles which have heretofore been finished by blasting with an impact media, often metal particles moving at high velocities. Accordingly, prior art blasting apparatus and methods have not been adaptable to the problem of automated cleaning of molded sand cores, and the present rubbing by hand methods for cleaning cores are unacceptable because they are time consuming and expensive.
  • US-A-2929120 discloses apparatus for removing flash and other excess material from sand cores in accordance with the prior art portion of claim 1.
  • This prior apparatus uses particles of sand carried in a stream of air to engage the sand cores to be cleaned and finished.
  • the present invention as characterised in the characterising portion of claim 1, uses a stream containing a large volume of relatively soft cleaning particles which have a gentle but effective cleaning action on the lightweight sand cores.
  • the particular entraining means of the present invention enables a relatively high volume of the soft cleaning particles to be entrained in the relatively low pressure stream of conveying air so as to provide the necessary gentle cleaning action on the lightweight sand cores.
  • the preferred apparatus consists of a conveyor on which the relatively light-weight sand cores are supported so that the opposite sides of the cores can be reached by streams of impact particles.
  • a plurality of nozzles are positioned both above and below the conveyor and relatively low pressure air is directed through the nozzles in the direction of the sand cores on the conveyors.
  • Large volumes of relatively soft impact particles without any sharp points or edges, such as small pieces of plastic, are entrained in the air so that they will be directed against the sand cores.
  • the flash and other excess material is relatively loosely adhered or attached to the main body of the core and as a result, when these loosely adhered pieces are impacted by the moving particles, they are dislodged from the main body of the core. However, when these relatively soft slow moving particles engage the sand core, the particles do not damage or disrupt the surface of the main body of the core.
  • the apparatus can be operated continuously to automatically clean and finish a large number of sand cores in a short time.
  • the use of the apparatus of this invention is advantageous in that it provides for the rapid and thorough cleaning of complex parts by subjecting these parts to showers of particles moving against the parts from different directions so as to finish both internal and external surfaces in the part.
  • the apparatus of this invention is shown in Figs. 1 and 2 as including a main frame 12 on which is mounted a housing 14 and a conveyor assembly 16 which is operable to move sand cores to be cleaned through the housing 14.
  • a piuratity of nozzles 18 are mounted in the housing 14 at positions above the conveyor assembly 16 and a plurality of the same nozzles 18 mounted below the conveyor 16.
  • the nozzles 18 are supplied with air by a blower or turbine 20 and a particalized media 22 is fed to the nozzles 18 from a supply hopper 24 located above the nozzles 18.
  • An elevator assembly 26, of conventional type, operates to transfer used particles 22 from the bottom of the apparatus and deliver these particles to the hopper 24 for re-use.
  • the conveyor assembly 16 is illustrated as including a plurality of endless strands 28 (Fig. 1), similar to ropes or cables, trained about pulley or sheave assemblies 30, 31 and 32 mounted on the main frame 12.
  • the pulley assembly 30 includes a shaft 34 which is driven by a motor drive assembly 36 so as to move the strands 28 that extend horizontally between the pulley assemblies 30 and 31 from left to right in Fig. 1.
  • a plurality of sand cores to be finished indicated diagrammatically at 38 in Fig. 2, are laid on the horizontal strands 28 and are moved by the strands into the housing 14 to positions between the upwardly and downwardly directed nozzles assemblies 18.
  • each of the nozzles 18 consists of a nozzle head 42 rotatably mounted on an injector body 44 which is connected to a conduit 46 through which air is supplied from the blower 20 and a conduit 48 through which the particles 22 are supplied.
  • An inclined septum 47 directs the particles in conduit 48 toward the air stream emanating from conduit 46 at the lower edge 49 of the septum 47. Since the air stream in conduit 46 is created by the blower 20, in contrast to a compressor, it is at a low superatmospheric pressure, namely, below 2 psi. (0.14 bore). As a result, the stream entrains large volumes of the particles 22 falling off the edge 49 in the form of a curtain. This forms a low pressure stream issuing from nozzle head 42 that contains a dense accumulation of particles 22 directed toward sand cores to be cleaned. It is to be understood that the nozzle head 42 can be remote from the injector--body 44 and be connected thereto by a suitable passage.
  • the result is a relatively soft flow of particles 22 from each nozzle head 42 that provides for a shower of the particles 22 on both the top and bottom sides of the cores 38 supported on the strands 28 in the housing 14.
  • a variety of different relatively soft particles 22 that do not have sharp edges or corners, such as walnut shells, corn cobs and similar non-ferrous media, can be used in apparatus 10. Particles that are as hard as conventional steel shot used for blast cleaning are too hard and cause erosion of a sand core. However, particles 22 formed of plastic and generally cylindrical in shape and processed so as to have rounded edges, as illustrated in Fig. 6, are preferred from the standpoints of effectiveness, cost, cleanliness and lack of surface erosion on the core.
  • the particles 22 are preferably formed of an easily obtained plastic, such as polyethylene or polypropylene, and are relatively small .in size, having a diameter of about 0.07 inches (1.8 mm) and a length of about 0.10 inches (2.54 mm) or less.
  • a rough molded sand core 38 is shown in Fig. 4.
  • the core is of a relatively complex shape having notches 50, openings 52, projections 54, and other irregularly shaped surfaces on which excess material, a mixture of sand and the binder, adhere as indicated at 56.
  • These excess adhering portions 56 are sometimes referred to as "flash" and must be removed from the main body 58 of the sand core 38 in order to make the core 38 useable for its intended purpose in a molding process.
  • the cores 38 are placed on the conveyor 16 as shown in Fig. 2 so that they travel on the conveyor 16 through the enclosure 14 and are subjected to the fluidized media 22 that is directed from both above and below onto the surfaces of the sand core 38.
  • the open construction of the conveyor 16 enables thorough showering of the core 38 from both above and below. After the sand cores 38 emerge from the housing 14, they are readily useable in molding operations.
  • the method and apparatus of this invention provides for the relatively gentle application of soft impact particles against the somewhat vulnerable body 58 of the sand core 38 so as to provide for the complete removal of all of the excess materials 56 on the body 58 without danger of damage to the body 58.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Casting Devices For Molds (AREA)

Claims (7)

1. Anlage zum Entfernen von Grat und anderem überschüssigem Material von Sandkernen (38) mit mindestens einer Düse (18), einem Gebläse (20) zum Zuführen von bewegter Luft niedrigen Druckes zu der Düse, einer Mehrzahl von Aufschlagteilchen (22), einer Zuführungseinrichtung (48), die zum Liefern der Aufschlagteilchen in die bewegte Luft betreibbar ist, so daß ein die Teilchen enthaltener Strom bewegter Luft von der Düse gebildet wird, und eine Einrichtung (16) zum Angreifen der Sandkerne durch den Strom, dadurch gekennzeichnet, daß die Aufschlagteilchen (22) aus einem Material sind, das weich im Vergleich mit dem Material der Sandkerne (38) ist, und daß die Zuführungseinrichtung einen Injektorkörper (44) der an einer mit dem Gebläse in Verbindung stehenden ersten Leitung (46) und einer die Aufschlagteilchen zuführenden zweiten Leitung (48) angebracht ist und eine zu dem Injektorkörper (44) gehörige Einrichtung (47) zum Vorsehen bei Benutzung der Anlage eines abwärts fließenden Vorhanges der Teilchen von der zweiten Leitung (48), der durch einen bewegten Strom von Luft von der ersten Leitung (46), der betreibbar ist zum Einschließen der Teilchen darin, unterbrochen wird, aufweist, wobei die Düse einen mit dem Injektorkörper (46) in Verbindung stehenden Düsenkopf (42) aufweist, der betreibbar ist zum Leiten des Stromes von Luft und Aufschlagteilchen auf die zu reinigenden Kerne.
2. Anlage nach Anspruch 1, dadurch gekennzeichrret, daß die Einrichtung (16) zum Angreifen der Sandkerne durch den Strom betreibbar ist zum Bewegen von zu reinigenden Sandkernen in den Weg des Stromes von der Düse.
3. Anlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine Mehrzahl der Düsen (18) zum Vorsehen von Strömen von Teilchen, die gegen entgegengesetzte Seiten der Kerne gereichtet sind, vorgesehen sind.
4. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Teilchen aus einem Kunststoffmaterial gebildet sind.
5. Anlage nach Anspruch 4, dadurch gekennzeichnet, daß das Kunststoffmaterial Polyäthylen oder Polypropylen aufweist.
6. Anlage nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Aufschlagteilchen (22) allgemein zylindrisch in der Form mit einem Durchmesser von ungefähr 0,07 Zoll (1,8 mm) und einer Länge von ungefähr 0,1 Zoll (2,54 mm) sind.
7. Anlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sich eine abwärts geneigte Trennwand (47) von der zweiten Leitung (48) in die erste Leitung (46) erstreckt und an einer freien Kante (49) endet, von der Teilchen in der zweiten Leitung (48) zum Bilden des Vorhanges fließen.
EP19840305627 1983-09-06 1984-08-17 Verfahren und Vorrichtung zum Entfernen von überflüssigem Material von Sandkernen Expired EP0140511B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52926083A 1983-09-06 1983-09-06
US529260 1983-09-06

Publications (2)

Publication Number Publication Date
EP0140511A1 EP0140511A1 (de) 1985-05-08
EP0140511B1 true EP0140511B1 (de) 1987-11-04

Family

ID=24109161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840305627 Expired EP0140511B1 (de) 1983-09-06 1984-08-17 Verfahren und Vorrichtung zum Entfernen von überflüssigem Material von Sandkernen

Country Status (5)

Country Link
EP (1) EP0140511B1 (de)
JP (1) JPS6072638A (de)
AU (1) AU574382B2 (de)
CA (1) CA1214916A (de)
DE (1) DE3467105D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10225666B4 (de) * 2001-06-11 2004-10-28 General Motors Corp., Detroit Gießen von Motorblöcken

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016114826A1 (de) * 2016-08-10 2018-02-15 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Bremsträger
WO2019051521A1 (de) * 2017-09-18 2019-03-21 Fill Gesellschaft M.B.H. VERFAHREN ZUM ENTGRATEN VON GIEßKERNEN UND GIEßFORMEN
AT522989B1 (de) * 2019-10-03 2021-12-15 Fill Gmbh Oberflächenbehandlungsverfahren

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2929120A (en) * 1957-12-04 1960-03-22 Gen Motors Corp Method of definning sand cores
JPS49108692A (de) * 1973-02-19 1974-10-16
JPS5630057A (en) * 1979-08-15 1981-03-26 Mazda Motor Corp Deburring method for core
DE3201284A1 (de) * 1982-01-18 1983-08-04 Carl Kurt Walther Gmbh & Co Kg, 5600 Wuppertal Verfahren zum entgraten und schlichteueberziehen von geschossenen giesskernen
JPS58205646A (ja) * 1982-05-24 1983-11-30 Sintokogio Ltd 中子のバリ取り方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10225666B4 (de) * 2001-06-11 2004-10-28 General Motors Corp., Detroit Gießen von Motorblöcken

Also Published As

Publication number Publication date
EP0140511A1 (de) 1985-05-08
CA1214916A (en) 1986-12-09
JPS6072638A (ja) 1985-04-24
AU3263284A (en) 1985-03-14
AU574382B2 (en) 1988-07-07
DE3467105D1 (en) 1987-12-10

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