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EP0060348A2 - Feeder head for castings - Google Patents

Feeder head for castings Download PDF

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Publication number
EP0060348A2
EP0060348A2 EP81110681A EP81110681A EP0060348A2 EP 0060348 A2 EP0060348 A2 EP 0060348A2 EP 81110681 A EP81110681 A EP 81110681A EP 81110681 A EP81110681 A EP 81110681A EP 0060348 A2 EP0060348 A2 EP 0060348A2
Authority
EP
European Patent Office
Prior art keywords
feeder
suction
volume
castings
casting
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
EP81110681A
Other languages
German (de)
French (fr)
Other versions
EP0060348B1 (en
EP0060348A3 (en
Inventor
Manfred Scherer
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.)
Bosch Rexroth AG
Original Assignee
Mannesmann Rexroth 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 Mannesmann Rexroth AG filed Critical Mannesmann Rexroth AG
Priority to AT81110681T priority Critical patent/ATE28285T1/en
Publication of EP0060348A2 publication Critical patent/EP0060348A2/en
Publication of EP0060348A3 publication Critical patent/EP0060348A3/en
Application granted granted Critical
Publication of EP0060348B1 publication Critical patent/EP0060348B1/en
Expired 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
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
    • B22C9/088—Feeder heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates

Definitions

  • the invention relates to a feeder according to the preamble of claim 1.
  • the feeder volume is designed as an elongated cylinder, the height of which is at least one and a half times the diameter of a circular area based on the base area of the feeder volume.
  • several feeders must be placed (DE-PS 20 10 337).
  • a feeder of oval cross section is also known, the length of which is four times the radius of the end semicircles.
  • the object of the present invention is to make do with a single feeder, in particular in the case of elongated or hollow cylindrical workpieces.
  • This object is achieved according to the invention by the features in the characterizing part of claim 1.
  • the feeder designed according to the invention can be adapted to the shape of the workpiece to be cast, as a result of which the formation of voids is counteracted.
  • the feed area of the feeder which is narrow in relation to the length, can be polygonal, in particular rectangular or ring-shaped, the average width being the quotient of the base area of the workpiece to be cast in the casting position and the greatest extent in the straight direction in the case of a polygon or the extent in a circle in the case of a hollow cylindrical casting.
  • a casting 1 is embedded in a sand mold 2. On this a cylindrical hood 3 is placed, which consists of an exothermic heating mass. The hood 3 is surrounded on its outside by a cover 4 made of asbestos paper. The hood 3 limits a feeder volume, which corresponds to the suction requirement of the casting 1, including a small amount of cast iron that forms a residual feeder 6. At the lower end of the hood 3 there is a cut surface 7 on which the residual feeder 6 is separated from the casting 1. The hood 3 is chosen so large that the amount of heat given off by the exothermic heating mass keeps the casting material forming the feed volume 5 liquid until the end of the suction through the casting 1. During the re-suction process, the level of the cast material drops in accordance with the re-suction requirement of the casting.
  • the feeder volume is essentially rectangular in cross section, the length L of the rectangle being more than twice, preferably four times, the width B. of this rectangle is.
  • the cross section of the feeder volume 5 can also be polygonal or annular. In the case of a non-rectangular body, the length of the cross section is determined in the case of a polygon by the greatest straight section within the rectangle and in the case of a ring or part of a ring by the arch on its outer circumference.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Confectionery (AREA)
  • Pipe Accessories (AREA)

Abstract

Ein Speiser für Gußstücke, insbesondere ausGußeisen, hat eine zylinderartige Haube aus einer exothermen Heizmasse, die das im Speiser befindliche Gießgut bis zur Beendigung des Nachsaugens durch den zu speisenden Gußstückbereich flüssig hält und bis zur Anschnittfläche des Speisers reicht. Das Volumen des Speisers entspricht der Größe des Nachsaugvolumens zuzüglich eines maximalen Sicherheitsbetrages von 30% des Nachsaugvolumens. Um insbesondere bei langgestreckten oder hohlzylinderartigen Werkstücken mit einem einzigen Speiser auszukommen, ist die Länge (L) der Anschnittfläche (6) des Speisers mehr als das Doppelte der durchschnittlichen Breite (B) der Anschnittfläche.

Figure imgaf001
A feeder for castings, in particular made of cast iron, has a cylinder-like hood made of an exothermic heating mass, which keeps the cast material in the feeder liquid until the suction through the casting area to be fed is finished and extends to the gate surface of the feeder. The volume of the feeder corresponds to the size of the suction volume plus a maximum safety amount of 30% of the suction volume. In order to make do with a single feeder, particularly in the case of elongated or hollow cylindrical workpieces, the length (L) of the cut surface (6) of the feeder is more than twice the average width (B) of the cut surface.
Figure imgaf001

Description

die Erfindung bezieht sich auf einen Speiser entsprechend dem Oberbegriff des Anspruches 1.the invention relates to a feeder according to the preamble of claim 1.

Bei einem bekannten Speiser der vorgenannten Art ist das Speiservolumen als langgestreckter Zylinder ausgebildet, dessen Höhe mindestens das Eineinhalbfache des Durchmessers einer auf die Grundfläche des Speiservolumens bezogenen Kreisfläche beträgt. Bei langgestreckten Werkstücken müssen mehrere Speiser gesetzt werden (DE-PS 20 10 337).In a known feeder of the aforementioned type, the feeder volume is designed as an elongated cylinder, the height of which is at least one and a half times the diameter of a circular area based on the base area of the feeder volume. In the case of elongated workpieces, several feeders must be placed (DE-PS 20 10 337).

Es ist auch ein Speiser ovalen Querschnittes bekannt, dessen Länge das Vierfache des Radius der endseitigen Halbkreise ist.A feeder of oval cross section is also known, the length of which is four times the radius of the end semicircles.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, insbesondere bei langgestreckten oder hohlzylinderartigen Werkstücken mit einem einzigen Speiser auszukommen. Diese Aufgabe wird durch die Merkmale im Kennzeichnungsteil des Anspruches 1 erfindungsgemäß gelöst. Der erfindungsgemäß ausgebildete Speiser kann der Gestalt des zu gießenden Werkstückes angepasst werden, wodurch der Lunkerbildung entgegengewirkt wird. Die im Verhältnis zur Länge schmale Anschnittfläche des Speisers kann mehreckig, insbesondere rechteckig oder ringförmig, ausgebildet sein, wobei sich die durchschnittliche Breite aus dem Quotienten der Grundfläche des zu gießenden Werkstückes in Gießlage und der größten Erstreckung in gerader Richtung bei einem Mehreck bzw. der Größenerstreckung auf einem Kreis bei einem hohlzylinderförmigen Gießkörper errechnet.The object of the present invention is to make do with a single feeder, in particular in the case of elongated or hollow cylindrical workpieces. This object is achieved according to the invention by the features in the characterizing part of claim 1. The feeder designed according to the invention can be adapted to the shape of the workpiece to be cast, as a result of which the formation of voids is counteracted. The feed area of the feeder, which is narrow in relation to the length, can be polygonal, in particular rectangular or ring-shaped, the average width being the quotient of the base area of the workpiece to be cast in the casting position and the greatest extent in the straight direction in the case of a polygon or the extent in a circle in the case of a hollow cylindrical casting.

Weitere Vorteile ergeben sich aus dem übrigen Anspruch, der Beschreibung und der Zeichnung. In dieser ist ein Teil einer Gießform als Ausführungsbeispiel des Gegenstandes der Erfindung schematisch dargestellt. Es zeigen

  • Fig. 1 einen Schnitt nach Linie 1-1,
  • Fig. 2 einen Schnitt nach Linie II-II in Fig. 1.
Further advantages result from the remaining claim, the description and the drawing. In this part of a casting mold is shown schematically as an embodiment of the object of the invention. Show it
  • 1 shows a section along line 1-1,
  • 2 shows a section along line II-II in FIG. 1st

Ein Gußstück 1 ist in eine Sandform 2 eingebettet. Auf diese ist eine zylinderförmige Haube 3 aufgesetzt, die aus einer exothermen Heizmasse besteht. Die Haube 3 ist auf ihrer Außenseite durch eine Hülle 4 aus Asbestpapier umgeben. Die Haube 3 begrenzt ein Speiservolumen, das dem Nachsaugbedarf des Gußstückes 1 einschließlich einer geringen, einen Restspeiser 6 bildenden Menge aus Gußeisen entspricht. Am unteren Ende der Haube 3 befindet sich eine Anschnittfläche 7, an der der Restspeiser 6 vom Gußstück 1 abgetrennt wird. Die Haube 3 ist so groß gewählt, daß die von der exothermen Heizmasse abgegebene.Wärmemenge das das Speiservolumen 5 bildende Gießgut bis zur Beendigung des Nachsaugens durch das Gußstück 1 flüssig hält. Während des Nachsaugvorgangs sinkt der Gießgutspiegel entsprechend dem Nachsaugbedarf des Gußstückes.A casting 1 is embedded in a sand mold 2. On this a cylindrical hood 3 is placed, which consists of an exothermic heating mass. The hood 3 is surrounded on its outside by a cover 4 made of asbestos paper. The hood 3 limits a feeder volume, which corresponds to the suction requirement of the casting 1, including a small amount of cast iron that forms a residual feeder 6. At the lower end of the hood 3 there is a cut surface 7 on which the residual feeder 6 is separated from the casting 1. The hood 3 is chosen so large that the amount of heat given off by the exothermic heating mass keeps the casting material forming the feed volume 5 liquid until the end of the suction through the casting 1. During the re-suction process, the level of the cast material drops in accordance with the re-suction requirement of the casting.

Das Speiservolumen ist im Querschnitt gesehen, wie in Fig. 2 dargestellt, im wesentlichen rechteckig ausgebildet, wobei die Länge L des Rechteckes mehr als das Doppelte, vorzugsweise das Vierfache, der Breite B dieses Rechteckes ist. Der Querschnitt des Speiservolumens 5 kann auch mehreckig oder ringförmig ausgebildet sein. Bei einem nicht rechteckigen Körper wird die Länge des Querschnittes bei einem Mehreck durch die größte gerade Strecke innerhalb des Rechteckes bestimmt und bei einem Ring oder einem Teil eines Ringes durch den Bogen auf dessen Außenumfang.As seen in FIG. 2, the feeder volume is essentially rectangular in cross section, the length L of the rectangle being more than twice, preferably four times, the width B. of this rectangle is. The cross section of the feeder volume 5 can also be polygonal or annular. In the case of a non-rectangular body, the length of the cross section is determined in the case of a polygon by the greatest straight section within the rectangle and in the case of a ring or part of a ring by the arch on its outer circumference.

Claims (2)

1. Speiser für Gußstücke, insbesondere aus Gußeisen, mit einer zylinderartigen Haube aus einer exothermen Heizmasse, die das im Speiser befindliche Gießgut bis zur Beendigung des Nachsaugens durch den zu speisenden Gußstückbereich flüssig hält und bis zur Anschnittfläche des Speisers reicht, wobei das Volumen des Speisers der Größe des Nachsaugvolumens zuzüglich eines maximalen Sicherheitsbetrages von 30 % des Nachsaugvolumens entspricht, dadurch gekennzeichnet , daß die Länge (L) der Anschnittfläche (6) des Speisers mehr als das Doppelte der durchschnittlichen Breite (B) der Anschnittfläche ist.1. Feeder for castings, in particular made of cast iron, with a cylindrical hood made of an exothermic heating mass, which keeps the cast material in the feeder liquid until the suction through the casting area to be fed and extends to the gate surface of the feeder, the volume of the feeder corresponds to the size of the suction volume plus a maximum safety amount of 30% of the suction volume, characterized in that the length (L) of the gate area (6) of the feeder is more than twice the average width (B) of the gate area. 2. Speiser nach Anspruch 1, dadurch gekennzeichnet, daß die Anschnittfläche im wesentlichen rechteckig ist.2. Feeder according to claim 1, characterized in that the gate surface is substantially rectangular.
EP81110681A 1981-03-18 1981-12-22 Feeder head for castings Expired EP0060348B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81110681T ATE28285T1 (en) 1981-03-18 1981-12-22 FEEDERS FOR CASTINGS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3110535A DE3110535C2 (en) 1981-03-18 1981-03-18 Feeder for castings
DE3110535 1981-03-18

Publications (3)

Publication Number Publication Date
EP0060348A2 true EP0060348A2 (en) 1982-09-22
EP0060348A3 EP0060348A3 (en) 1984-07-25
EP0060348B1 EP0060348B1 (en) 1987-07-15

Family

ID=6127627

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81110681A Expired EP0060348B1 (en) 1981-03-18 1981-12-22 Feeder head for castings

Country Status (3)

Country Link
EP (1) EP0060348B1 (en)
AT (1) ATE28285T1 (en)
DE (1) DE3110535C2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158752A (en) * 1984-05-16 1985-11-20 Rexroth Mannesmann Gmbh Improvements in or relating to a feeder for a casting
US4779669A (en) * 1986-10-14 1988-10-25 Foseco International Ltd. Feeder sleeves

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10059481B4 (en) * 2000-11-30 2012-02-23 AS Lüngen GmbH Feeder with a tube-like body

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3302256A (en) * 1964-09-15 1967-02-07 Full Mold Process Inc Gasifiable feeder head pattern
US3614053A (en) * 1969-10-10 1971-10-19 Amsted Ind Inc Riser construction for casting apparatus
DE2010337B1 (en) * 1970-03-05 1971-11-25 Rexroth Gmbh G L Exothermic riser for castings

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2158752A (en) * 1984-05-16 1985-11-20 Rexroth Mannesmann Gmbh Improvements in or relating to a feeder for a casting
AU571692B2 (en) * 1984-05-16 1988-04-21 Mannesmann Rexroth Gmbh Exothermic feeder for casting
US4779669A (en) * 1986-10-14 1988-10-25 Foseco International Ltd. Feeder sleeves

Also Published As

Publication number Publication date
DE3110535A1 (en) 1982-11-11
EP0060348B1 (en) 1987-07-15
DE3110535C2 (en) 1986-10-09
ATE28285T1 (en) 1987-08-15
EP0060348A3 (en) 1984-07-25

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