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EP0051302A1 - Flask for the vacuum moulding process - Google Patents

Flask for the vacuum moulding process Download PDF

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Publication number
EP0051302A1
EP0051302A1 EP81109383A EP81109383A EP0051302A1 EP 0051302 A1 EP0051302 A1 EP 0051302A1 EP 81109383 A EP81109383 A EP 81109383A EP 81109383 A EP81109383 A EP 81109383A EP 0051302 A1 EP0051302 A1 EP 0051302A1
Authority
EP
European Patent Office
Prior art keywords
molding box
cover
wire mesh
box according
sections
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.)
Withdrawn
Application number
EP81109383A
Other languages
German (de)
French (fr)
Inventor
Werner Schneider
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.)
Aqseptence Group GmbH
Original Assignee
Passavant Werke AG and Co KG
Passavant Werke Michelbacher Hutte
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 Passavant Werke AG and Co KG, Passavant Werke Michelbacher Hutte filed Critical Passavant Werke AG and Co KG
Publication of EP0051302A1 publication Critical patent/EP0051302A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C21/00—Flasks; Accessories therefor
    • B22C21/01—Flasks; Accessories therefor for vacuum-sealed moulding

Definitions

  • the invention relates to a molding box for the vacuum molding process with at least one vacuum line running through the molding box, or the like from a perforated tube. and a fine-mesh wire mesh drawn over it.
  • Such a molding box is known from DE-PS 22 48 968.
  • the vacuum serves to solidify the binder-free molding sand in the molding box.
  • the vacuum from the vacuum line is evenly distributed in the molding sand, which has proven to be particularly advantageous for complicated and / or large-area castings.
  • the fine-mesh wire mesh does not withstand the temperatures that occur during casting for long. This is especially true if you which is favorable for casting reasons, arranges the vacuum line as close as possible to the casting cavity. The wire mesh burns and becomes permeable to the molding sand.
  • the invention is therefore based on the object of further developing the molding box mentioned at the outset in such a way that the wire mesh has a longer service life.
  • the molding box according to the invention is characterized in that the wire mesh is largely covered by an outer cover provided with openings.
  • the cover protects the wire mesh without hindering the distribution of the vacuum through the vacuum line.
  • the vacuum line can be arranged very close to the mold cavity without danger to the wire mesh.
  • a particularly favorable shielding of the wire mesh results from the fact that the openings of the cover are only partially cut out and are raised like a flap.
  • the cover is preferably formed by metal strips. This material is not only particularly cheap and easy to work with, but also sufficiently resistant so that protection against falling castings is readily provided.
  • the invention can further be characterized in that the cover at least partially abuts the wire mesh directly and its openings correspond to the holes in the perforated tube.
  • the cover also serves to clamp the wire mesh onto the perforated tube. If only individual areas of the cover are used for this purpose, the remaining areas at a distance from the pipe can do so promise to form a protective "canopy" of the wire mesh. If the cover is fully in contact, no liquid metal can penetrate the gap between the cover and the wire mesh in the event of incorrect castings. Any damage to the wire mesh is then limited to the areas of the openings in the cover.
  • the lack of a void between the cover and the wire mesh may also be advantageous because no sand can settle there, which otherwise could only clog up when the empty molding box was transported and then lead to additional environmental pollution due to the development of dust.
  • the perforated tube has a square, in particular square, cross section. This offers the possibility of producing the cover from flat sections in a simple manner.
  • the cover is divided in the longitudinal direction of the tube into sections that are easy to manufacture and assemble. It is also possible to design the openings not as recesses in the cover, but as spaces between the sections.
  • the wire mesh can advantageously also be divided into corresponding sections. Any exchange of individual wire mesh panels does not pose any difficulties in this way. This applies in particular when, as is also proposed by the invention, opposite sections are held by screws penetrating the tube.
  • a molded box 1 partially shown in plan view in FIG. 1 consists of a frame 2 which is open at the top and bottom, one longitudinal side of which is designed as a hollow box section 3 and carries a connecting piece 4 for a suction line.
  • a frame 2 which is open at the top and bottom, one longitudinal side of which is designed as a hollow box section 3 and carries a connecting piece 4 for a suction line.
  • On the inside of the hollow box profile screw connections 5 are provided for vacuum lines 6, the opposite free ends of which are loosely held in pipe sections 5 '.
  • a section of a wire mesh 9 is placed between the two and is tightly clamped by means of the sections of the cover 8 fastened by screws 10. The screws 10 penetrate the entire tube. Two screws that belong together are slightly offset in the longitudinal direction of the pipe so that they pass each other. The sections of the wire mesh 9 are also penetrated by the screws, so that the sections of the cover 8 rest over their entire length.

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

Abstract

The flask (1) is provided with vacuum lines (6). Each vacuum line comprises a square tube, the holes (7) of which are masked by sections of a wire cloth (9). Sections of a covering (8), which has openings (7') corresponding to the holes (7) of the square tube, serve to protect and secure the wire cloth (9). The sections of the wire cloth (9) and of the covering (8) are held by screws (10), which extend transversely through the respective vacuum line (6). <IMAGE>

Description

Die Erfindung betrifft einen Formkasten für das Vakuumformverfahren mit mindestens einer durch den Formkasten verlaufenden Unterdruckleitung, die aus einem gelochten Rohr o.dgl. und einem darüber gezogenen feinmaschigen Drahtgewebe besteht.The invention relates to a molding box for the vacuum molding process with at least one vacuum line running through the molding box, or the like from a perforated tube. and a fine-mesh wire mesh drawn over it.

Ein derartiger Formkasten ist aus der DE-PS 22 48 968 bekannt. Der Unterdruck dient dazu, den bindemittelfreien Formsand im Formkasten zu verfestigen. Dabei wird das Vakuum von der Unterdruckleitung gleichmäßig im Formsand verteilt, was sich insbesondere bei komplizierten und/oder großflächigen Gußteilen als vorteilhaft erweist.Such a molding box is known from DE-PS 22 48 968. The vacuum serves to solidify the binder-free molding sand in the molding box. The vacuum from the vacuum line is evenly distributed in the molding sand, which has proven to be particularly advantageous for complicated and / or large-area castings.

In der Praxis hat sich gezeigt, daß das feinmaschige Drahtgewebe den beim Gießen auftretenden Temperaturen nicht lange standhält. Dies gilt insbesondere dann, wenn man, was aus gießtechnischen Gründen günstig ist, die Unterdruckleitung möglichst nahe am Gießhohlraum anordnet. Das Drahtgewebe verbrennt und wird für den Formsand durchlässig.In practice, it has been shown that the fine-mesh wire mesh does not withstand the temperatures that occur during casting for long. This is especially true if you which is favorable for casting reasons, arranges the vacuum line as close as possible to the casting cavity. The wire mesh burns and becomes permeable to the molding sand.

Der Erfindung liegt daher die Aufgabe zugrunde, den eingangs genannten Formkasten derart weiterzuentwickeln, daß das Drahtgewebe eine längere Standzeit erhält.The invention is therefore based on the object of further developing the molding box mentioned at the outset in such a way that the wire mesh has a longer service life.

Zur Lösung dieser Aufgabe ist der Formkasten nach der Erfindung dadurch gekennzeichnet, daß das Drahtgewebe zu einem erheblichen Teil durch eine mit Öffnungen versehene äußere Abdeckung abgedeckt ist. Die Abdeckung schützt das Drahtgewebe, ohne die Verteilung des Vakuums durch die Unterdruckleitung zu behindern. Die Unterdruckleitung kann ohne Gefahr für das Drahtgewebe sehr nahe am Formhohlraum angeordnet werden.To achieve this object, the molding box according to the invention is characterized in that the wire mesh is largely covered by an outer cover provided with openings. The cover protects the wire mesh without hindering the distribution of the vacuum through the vacuum line. The vacuum line can be arranged very close to the mold cavity without danger to the wire mesh.

Eine besonders günstige Abschirmung des Drahtgewebes ergibt sich dadurch, daß die öffnungen der Abdeckung nur teilweise ausgeschnitten und klappenartig hochgestellt sind.A particularly favorable shielding of the wire mesh results from the fact that the openings of the cover are only partially cut out and are raised like a flap.

Für die Abdeckung kommen verschiedene Materialien in Frage. Vorzugsweise jedoch ist die Abdeckung von Metallstreifen gebildet. Dieses Material ist nicht nur besonders billig und leicht zu verarbeiten, sondern auch ausreichend widerstandsfähig, so daß ohne weiteres ein Schutz gegen herabfallende Gußstücke geboten wird.Different materials can be used for the cover. However, the cover is preferably formed by metal strips. This material is not only particularly cheap and easy to work with, but also sufficiently resistant so that protection against falling castings is readily provided.

Die Erfindung kann ferner dadurch gekennzeichnet sein, daß die Abdeckung mindestens teilweise am Drahtgewebe unmittelbar anliegt und ihre Öffnungen mit den Löchern im gelochten Rohr korrespondieren. Dabei dient die Abdeckung gleichzeitig zum Aufklemmen des Drahtgewebes auf das gelochte Rohr. Werden hierzu nur einzelne Bereiche der Abdeckung benutzt, so können die restlichen Bereiche im Abstand zum Rohr sozusagen eine schützende "Überdachung" des Drahtgewebes bilden. Wenn die Abdeckung vollständig anliegt, kann bei Fehlgüssen kein flüssiges Metall in den Zwischenraum zwischen Abdeckung und Drahtgewebe eindringen. Etwaige Beschädigungen des Drahtgewebes beschränken sich dann also auf die Bereiche der Öffnungen in der Abdeckung. Das Fehlen eines Hohlraums zwischen Abdeckung und Drahtgewebe ist ggf. auch deshalb von Vorteil, weil sich dort kein Sand festsetzen kann, der sonst unter Umständen erst beim Transport des leeren Formkastens herauarieseln und dann durch Staubentwicklung zu einer zusätzlichen Umweltbelastung führen könnte.The invention can further be characterized in that the cover at least partially abuts the wire mesh directly and its openings correspond to the holes in the perforated tube. The cover also serves to clamp the wire mesh onto the perforated tube. If only individual areas of the cover are used for this purpose, the remaining areas at a distance from the pipe can do so promise to form a protective "canopy" of the wire mesh. If the cover is fully in contact, no liquid metal can penetrate the gap between the cover and the wire mesh in the event of incorrect castings. Any damage to the wire mesh is then limited to the areas of the openings in the cover. The lack of a void between the cover and the wire mesh may also be advantageous because no sand can settle there, which otherwise could only clog up when the empty molding box was transported and then lead to additional environmental pollution due to the development of dust.

Nach einem besonders vorteilhaften Merkmal hat das gelochte Rohr einen viereckigen, insbesondere quadratischen Querschnitt. Dies bietet die Möglichkeit, die Abdeckung in einfacher Weise aus flachen Abschnitten herzustellen.According to a particularly advantageous feature, the perforated tube has a square, in particular square, cross section. This offers the possibility of producing the cover from flat sections in a simple manner.

Vorzugsweise ist die Abdeckung in Längsrichtung des Rohres in Abschnitte unterteilt, die sich einfach herstellen und montieren lassen. Auch bietet sich die Möglichkeit, die Öffnungen nicht als Ausnehmungen in der Abdeckung, sondern als Zwischenräume zwischen den Abschnitten auszubilden. Dabei kann vorteilhafterweise auch das Drahtgewebe in entsprechende Abschnitte unterteilt sein. Ein etwaiger Austausch einzelner Drahtgewebefelder bereitet auf diese Weise keine Schwierigkeiten. Dies gilt insbesondere dann, wenn, wie es ferner von der Erfindung vorgeschlagen wird, sich gegenüberliegende Abschnitte durch das Rohr durchdringende Schrauben gehalten sind.Preferably, the cover is divided in the longitudinal direction of the tube into sections that are easy to manufacture and assemble. It is also possible to design the openings not as recesses in the cover, but as spaces between the sections. The wire mesh can advantageously also be divided into corresponding sections. Any exchange of individual wire mesh panels does not pose any difficulties in this way. This applies in particular when, as is also proposed by the invention, opposite sections are held by screws penetrating the tube.

Die Erfindung wird im folgenden anhand eines bevorzugten Ausführungsbeispiels im Zusammenhang mit der beiliegenden Zeichnung näher erläutert. Die Zeichnung zeigt in:

  • Figur 1 eine abgebrochene Draufsicht einer erfindungsgemäßen Vorrichtung;
  • Figur 2 einen Schnitt entlang der Linie II-II in Figur 1.
The invention is explained below with reference to a preferred embodiment in connection with the accompanying drawings. The drawing shows in:
  • 1 shows a broken top view of a device according to the invention;
  • FIG. 2 shows a section along the line II-II in FIG. 1.

Ein in Figur 1 in der Draufsicht teilweise dargestellter Formkasten 1 besteht aus einem oben und unten offenen Rahmen 2, dessen eine Längsseite als Hohlkastenprofil 3 ausgebildet ist und einen Anschlußstutzen 4 für eine Absaugleitung trägt. Auf der Innenseite des Hohlkastenprofils sind Schraubanschlüsse 5 für Unterdruckleitungen 6 vorgesehen, deren gegenüberliegende freie Enden in Rohrstücken 5' locker gehalten sind.A molded box 1 partially shown in plan view in FIG. 1 consists of a frame 2 which is open at the top and bottom, one longitudinal side of which is designed as a hollow box section 3 and carries a connecting piece 4 for a suction line. On the inside of the hollow box profile screw connections 5 are provided for vacuum lines 6, the opposite free ends of which are loosely held in pipe sections 5 '.

Die Unterdruckleitungen 6 bestehen mit Ausnahme ihrer beiden Enden aus Quadratrohr. Entlang aller vier Seiten sind die Rohre mit Löchern 7 versehen, die etwa 2/3 der Rohrbreite einnehmen. Jeweils drei dicht aufeinanderfolgende Löcher 7 sind von einem Abschnitt einer metallischen Abdeckung 8 abgedeckt, die öffnungen 7' in der gleichen Anordnung enthält. Zwischen beide ist ein Abschnitt eines Drahtgewebes 9 gelegt, der mittels der durch Schrauben 10 befestigten Abschnitte der Abdeckung 8 dicht festgeklemmt wird. Die Schrauben 10 durchdringen das ganze Rohr. Je zwei zusammengehörende Schrauben sind in Rohrlängsrichtung etwas gegeneinander versetzt, so daß sie aneinander vorbeikommen. Die Abschnitte des Drahtgewebes 9 werden ebenfalls von den Schrauben durchdrungen, damit die Abschnitte der Abdeckung 8 auf ihrer ganzen Länge vollflächig anliegen.The vacuum lines 6, with the exception of their two ends, consist of square tube. Along all four sides, the tubes are provided with holes 7, which take up about 2/3 of the tube width. In each case three closely spaced holes 7 are covered by a section of a metallic cover 8 which contains openings 7 'in the same arrangement. A section of a wire mesh 9 is placed between the two and is tightly clamped by means of the sections of the cover 8 fastened by screws 10. The screws 10 penetrate the entire tube. Two screws that belong together are slightly offset in the longitudinal direction of the pipe so that they pass each other. The sections of the wire mesh 9 are also penetrated by the screws, so that the sections of the cover 8 rest over their entire length.

Im Betrieb sind die von den Abschnitten der Abdeckung 8 größtenteils überdeckten Abschnitte des Drahtgewebes 9 gegen die Hitze des schmelzflüssigen Gußeisens sehr gut geschützt. Eine weitere Verbesserung kann dadurch erreicht werden, daß die Rohre um 45° gedreht werden. Dann liegen sie mit ihrer keine Löcher 7 aufweisenden Längskante dem Gußteil am nächsten.In operation, the sections of the wire mesh 9 which are largely covered by the sections of the cover 8 are very well protected against the heat of the molten cast iron. A further improvement can be achieved by rotating the tubes through 45 °. Then they lie with their longitudinal edge without holes 7 closest to the casting.

Sollte im Betrieb doch einmal ein Abschnitt des Drahtgewebes 9 schadhaft werden, dann ist der Austausch außerordentlich einfach und schnell zu bewerkstelligen. Er kann unter Umständen sogar durchgeführt werden, ohne den Formkasten aus dem Rundlauf zu nehmen.Should a section of the wire mesh 9 become defective in operation, the replacement can be carried out extremely easily and quickly. Under certain circumstances, it can even be carried out without taking the molding box out of the concentric run.

Claims (8)

1. Formkasten für das Vakuumformverfahren mit mindestens einer durch den Formkasten verlaufenden Unterdruckleitung, die aus einem gelochten Rohr o.dgl. und einem darüber gezogenen feinmaschigen Drahtgewebe besteht,
dadurch gekennzeichnet,
daß das Drahtgewebe (9) zu einem erheblichen Teil durch eine mit öffnungen (7') versehene äußere Abdeckung (8) abgedeckt ist.1. Molding box for the vacuum molding process with at least one vacuum line running through the molding box, or the like from a perforated tube. and there is a fine-mesh wire mesh drawn over it,
characterized,
that the wire mesh (9) is covered to a considerable extent by an outer cover (8) provided with openings (7 '). 2. Formkasten nach Anspruch 1,
dadurch gekennzeichnet,
daß die öffnungen (7') der Abdeckung (8) nur teilweise ausgeschnitten und klappenartig hochgestellt sind.2. molding box according to claim 1,
characterized,
that the openings (7 ') of the cover (8) are only partially cut out and raised like a flap. 3. Formkasten nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
daß die Abdeckung (8) von Metallstreifen gebildet ist.3. molding box according to claim 1 or 2,
characterized,
that the cover (8) is formed by metal strips. 4. Formkasten nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
daß die Abdeckung (8) mindestens teilweise am Drahtgewebe (9) unmittelbar anliegt und ihre öffnungen (7') mit den Löchern (7) im gelochten Rohr korrespondieren.4. molding box according to one of claims 1 to 3,
characterized,
that the cover (8) is at least partially in direct contact with the wire mesh (9) and its openings (7 ') correspond to the holes (7) in the perforated tube. 5. Formkasten nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
daß das gelochte Rohr einen viereckigen, insbesondere quadratischen Querschnitt hat.5. molding box according to one of claims 1 to 4,
characterized,
that the perforated tube has a square, in particular square, cross section. 6. Formkasten nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß die Abdeckung (8) in Längsrichtung des Rohres in Abschnitte unterteilt ist.6. molding box according to one of claims 1 to 5,
characterized,
that the cover (8) is divided into sections in the longitudinal direction of the tube. 7. Formkasten nach Anspruch 6,
dadurch gekennzeichnet,
daß auch das Drahtgewebe (9) in entsprechende Abschnitte unterteilt ist.7. molding box according to claim 6,
characterized,
that the wire mesh (9) is divided into corresponding sections. 8. Formkasten nach Anspruch 6 oder 7,
dadurch gekennzeichnet,
daß sich gegenüberliegende Abschnitte durch das Rohr durchdringende Schrauben (10) gehalten sind.8. molding box according to claim 6 or 7,
characterized,
that opposite sections are held by the tube penetrating screws (10).
EP81109383A 1980-11-05 1981-10-30 Flask for the vacuum moulding process Withdrawn EP0051302A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8029438U 1980-11-05
DE19808029438 DE8029438U1 (en) 1980-11-05 1980-11-05 MOLDING BOX FOR THE VACUUM FORMING PROCESS

Publications (1)

Publication Number Publication Date
EP0051302A1 true EP0051302A1 (en) 1982-05-12

Family

ID=6720320

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109383A Withdrawn EP0051302A1 (en) 1980-11-05 1981-10-30 Flask for the vacuum moulding process

Country Status (3)

Country Link
EP (1) EP0051302A1 (en)
JP (1) JPS57132745U (en)
DE (1) DE8029438U1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567932A (en) * 1983-05-21 1986-02-04 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Vacuum moulding flask
CN110860654A (en) * 2019-12-31 2020-03-06 芜湖新兴新材料产业园有限公司 Vacuum tube structure for lost foam sand box

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3123363C1 (en) * 1981-06-12 1982-11-04 Heinrich Wagner Maschinenfabrik GmbH & Co, 5928 Laasphe Device for the production of molds
DE3217477A1 (en) * 1982-05-10 1983-11-10 Buderus Ag, 6330 Wetzlar MOLDING BOX FOR A CASTING MOLD TO BE PRODUCED BY VESSEL
CN110947920B (en) * 2019-12-18 2020-11-13 芜湖久弘重工股份有限公司 Sand box for lost foam casting process
CN117226051B (en) * 2023-11-15 2024-01-30 山西汉通鑫宇科技股份有限公司 Intelligent sand box for casting

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2156138A1 (en) * 1971-10-08 1973-05-25 Akita Kk
FR2163455A1 (en) * 1971-12-14 1973-07-27 Akita Kk
DE2511620A1 (en) * 1974-03-16 1975-09-25 Sintokogio Ltd METHOD AND DEVICE FOR THE PRODUCTION OF VACUUM SEALED CASTING FORMS

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5149721U (en) * 1974-10-14 1976-04-15

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2156138A1 (en) * 1971-10-08 1973-05-25 Akita Kk
FR2163455A1 (en) * 1971-12-14 1973-07-27 Akita Kk
DE2511620A1 (en) * 1974-03-16 1975-09-25 Sintokogio Ltd METHOD AND DEVICE FOR THE PRODUCTION OF VACUUM SEALED CASTING FORMS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567932A (en) * 1983-05-21 1986-02-04 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Vacuum moulding flask
CN110860654A (en) * 2019-12-31 2020-03-06 芜湖新兴新材料产业园有限公司 Vacuum tube structure for lost foam sand box

Also Published As

Publication number Publication date
DE8029438U1 (en) 1981-03-19
JPS57132745U (en) 1982-08-18

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