EP3695917B1 - Insert de masselotte, procédé de fabrication d'un corps de masselotte pour un insert de masselotte ainsi que pièce maîtresse et boîte à noyaux destinés à la fabrication d'un corps de masselotte - Google Patents

Insert de masselotte, procédé de fabrication d'un corps de masselotte pour un insert de masselotte ainsi que pièce maîtresse et boîte à noyaux destinés à la fabrication d'un corps de masselotte Download PDF

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Publication number
EP3695917B1
EP3695917B1 EP19156932.6A EP19156932A EP3695917B1 EP 3695917 B1 EP3695917 B1 EP 3695917B1 EP 19156932 A EP19156932 A EP 19156932A EP 3695917 B1 EP3695917 B1 EP 3695917B1
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EP
European Patent Office
Prior art keywords
riser
expander element
feeder
cavity
expanded
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.)
Active
Application number
EP19156932.6A
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German (de)
English (en)
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EP3695917A1 (fr
Inventor
Olof Hilger
Jörg Schäfer
Thomas Schäfer
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.)
GTP Schaefer Giesstechnishe Produkte GmbH
Original Assignee
GTP Schaefer Giesstechnishe Produkte GmbH
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.)
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Publication date
Application filed by GTP Schaefer Giesstechnishe Produkte GmbH filed Critical GTP Schaefer Giesstechnishe Produkte GmbH
Priority to EP19156932.6A priority Critical patent/EP3695917B1/fr
Priority to PL19156932T priority patent/PL3695917T3/pl
Priority to US16/788,946 priority patent/US11358212B2/en
Publication of EP3695917A1 publication Critical patent/EP3695917A1/fr
Application granted granted Critical
Publication of EP3695917B1 publication Critical patent/EP3695917B1/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
    • 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
    • B22C9/082—Sprues, pouring cups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes

Definitions

  • the present invention relates to a feeder insert comprising a feeder body for use in casting metals into a casting mold, a method for producing a one-piece feeder body and a king and a core box comprising the king for producing a one-piece feeder body.
  • the feeder inserts In foundry technology, it is often necessary to arrange additional feeder inserts in the casting molds, the feeder body of which fills with the liquid metal when the casting is poured and compensates for any volume deficits that occur during the solidification of the casting in order to prevent the formation of voids in the casting.
  • the feeder inserts must be designed in such a way that the liquid metal fed into them solidifies later than the casting so that material can be transported to the casting during the solidification process, which tightly feeds the casting.
  • the feeder inserts consist of an exothermic and / or insulating material.
  • the feeder inserts have a feeder cavity for receiving liquid metal and a feeder opening for connecting the feeder cavity to a mold cavity of the casting mold during the casting process.
  • the feeder insert is during the casting process aligned vertically, ie an axis defined by the feeder opening is aligned vertically.
  • the feeder cavity adjoining the feeder opening is usually designed to be rotationally symmetrical about the axis, the hydrostatic pressure of the liquid metal located in the feeder cavity being sufficient for replenishment.
  • the feeder insert is aligned horizontally with its axis defined by the feeder opening during the casting process.
  • vertical green sand molding systems for the production of casting molds are known (also known as DISA molding systems and DISAMATIC®), in which a first half of the model is mounted on an exclusively linearly adjustable plunger and a second half of the model is mounted on a swiveling mold plate that is between a loading position in which it is aligned horizontally or vertically, for example, and in which it is equipped with a feeder insert, and a particularly vertically aligned casting position is moved back and forth.
  • a two-part feeder body whose feeder cavity, which is delimited by two shaped elements, has a predominant volume fraction above the axis when the axis is arranged horizontally, so that the hydrostatic pressure of the liquid metal located above the axis is sufficient for replenishment.
  • the two molded elements of this feeder insert can be telescoped relative to one another, so that one mold element is shifted to the other mold element during production of the casting mold, which enables the molding material of the casting mold to be compressed in the area surrounding the feeder opening.
  • a feeder insert which, due to the undercut design of the feeder cavity to the feeder opening, consists of two shaped elements which have to be glued to one another after their respective manufacture, which increases the manufacturing costs of the feeder insert. It is therefore desirable to simplify the feeder body of a feeder insert and its manufacture.
  • a two-part feeder body with an asymmetrical feeder cavity is also off WO 2016/050264 A1 known.
  • a feeder insert that is vertically aligned during the casting process and has a rotationally symmetrical feeder cavity
  • it is off WO 2017/046007 A1 known to produce a one-piece feeder body by means of a core shooting machine, in which an expandable, rotationally symmetrical king specifies the geometric shape of the feeder cavity during the shooting process.
  • the object of the present invention is therefore to eliminate the disadvantages described with reference to the prior art and in particular to provide a feeder insert, a method for producing a one-piece feeder body, and a king and a core box having the king for producing the one-piece feeder body, by means of which the production of a feeder insert arranged horizontally during the casting process is simplified.
  • the object is achieved by a feeder insert, a method for producing a feeder body and a king and a core box of a core shooting machine with the features of the respective independent claim.
  • Advantageous developments of the invention are specified in the dependent claims and in the description, with individual features of the advantageous developments being able to be combined with one another in a technically meaningful way.
  • the object is achieved in particular by a king for the production of a feeder body which is reversibly expandable in its outer contour and extends in a non-expanded state along a central longitudinal axis, the king in an expanded state having an asymmetrical shape with respect to the longitudinal axis.
  • the king In the non-expanded state, the king has, in particular, a cross-sectional configuration which can taper conically from a root, which can also be referred to as a foot, of the king to a free end.
  • the cross-sectional design in the unexpanded state of the king can be, for example, circular, oval, elliptical, trapezoidal, rectangular or square, with the corners being rounded in the case of a rectangular or square cross-sectional design.
  • the king thus has two side walls that are each parallel at least in cross-section.
  • the king in an expanded state, has an asymmetrical shape with respect to the longitudinal axis.
  • the outer contour of the expanded king thus extends in one direction at a greater distance from the longitudinal axis defined in the non-expanded state than in an opposite direction (in a cross-sectional plane orthogonal to the longitudinal axis).
  • the king is designed in such a way that there is little or no expansion in the area of the root of the king, so that the root of the king defines the shape of the feeder opening of the feeder body to be produced.
  • Such a king is used in particular together with a core box in a core casting machine for the production of a feeder body, wherein the core box comprises at least a first box and a second box.
  • the core box can also comprise further boxes.
  • Such an asymmetrical outer shape of the expanded king can be achieved, for example, in that the expansion of the king takes place in one direction during manufacture and no expansion takes place in the opposite direction. Of course, there can also be a greater expansion in one direction and a smaller expansion in an opposite direction.
  • Such an expansion in one direction can be achieved, for example, in that the king has a solid mandrel and comprises a flexible membrane fastened to the mandrel, which can be expanded by introducing a fluid into a space between the membrane and the mandrel, wherein the membrane expands to different degrees when widening in a plane orthogonal to the longitudinal axis of the mandrel.
  • the membrane has elasticity modules that are locally distributed in different ways.
  • the expansion in one direction could be caused by a delimitation element which is applied from the outside to the flexible membrane.
  • an expansion in one direction and no expansion in the opposite direction is achieved by the membrane with its peripheral edges both in the axial direction (i.e. at the bottom in the area of the root and at the top in the area of the free end of the king) as well as in the circumferential direction (for example along the longitudinal axis on the surface of the fixed mandrel) is attached to the mandrel, for example by vulcanization.
  • a feeder body produced in this way therefore has a feeder cavity for receiving liquid metal and a feeder opening for connecting the Feeder cavity with a mold cavity of the casting mold during the casting process, the feeder cavity having a larger diameter than the diameter of the feeder opening in at least one portion, the feeder opening defining an axis.
  • the feeder body consists of an insulating and / or exothermic feeder material and is designed in one piece, the feeder cavity being designed asymmetrically to the axis.
  • Such a feeder insert can be produced in just one shooting process in a core shooting machine.
  • the feeder cavity thus has a volume which is designed so that with a horizontal arrangement of the feeder insert and the axis defined by the feeder opening, a larger volume fraction of the volume of the feeder cavity can be positioned above the axis than below the axis.
  • a feeder insert is ideally suited for a vertically divided casting mold, in which the feeder insert is arranged horizontally during the casting process, since the liquid metal located above the axis provides sufficient hydrostatic pressure during the casting process, which is necessary for replenishing liquid metal in which the mold cavity of the casting mold is sufficient.
  • the exothermic and / or insulating material of the feeder body is thus homogeneously distributed in the wall area, cover area and the bottom area of the feeder body with the feeder opening, so that no interfaces would be formed between individual sections of the feeder body, as would be the case, for example, if the Feeder body would be glued together from several parts.
  • the feeder body can in particular have a further (ventilation) opening on a side opposite the feeder opening (that is to say in the cover area), which is used to guide the cap during molding.
  • a further opening can be created, for example, during the manufacturing process of the feeder body, in that the free end of the king opposite the root of the king is not expandable or is relatively little expandable.
  • the asymmetry of the feeder cavity is characterized in particular by the fact that the feeder cavity extends further, starting from the axis defined by the feeder opening, orthogonally to this axis than in an opposite direction.
  • the feeder cavity can be aligned during the casting process in such a way that a larger feeder volume is arranged above the axis than below.
  • the feeder cavity preferably has a minimum point on its circumferential surface in the region of the asymmetrical configuration, which is less spaced from the axis than adjacent points on the circumferential surface which are axially adjacent and opposite to the minimum point.
  • a minimum point with which the liquid material initially comes into contact when the feeder cavity is filled, improves the replenishment.
  • Such a point-like or linearly formed minimal point also known as a Williams notch or Williams bar
  • the membrane can be connected to the mandrel on its inside in an expandable area, so that the expansion of the membrane is locally limited.
  • the membrane can be fastened directly and directly to the mandrel at a point or line-shaped point, so that no expansion of the membrane takes place at this fastening point.
  • the expansion of the membrane could also be limited with a tether, which is fastened at one end to the mandrel and at the other end to the inside of the membrane.
  • the king in a non-expanded state, has a cross-sectionally rectangular, in particular square, shape with parallel side walls, it being possible for the side walls to be connected to one another by rounded portions.
  • the side walls can also be designed to be conically tapered along the longitudinal axis.
  • the feeder opening produced in the feeder body would thus also have an essentially rectangular (cross-sectional) shape.
  • the membrane is only arranged on one side wall of the king.
  • the king can have a different cross-sectional shape, such as round, oval or elliptical, the membrane preferably extending in the circumferential direction only over part of the circumference.
  • the membrane extends in the circumferential direction over no more than half of the total circumference.
  • accessories can be attached to the feeder body, in particular for forming a feeder neck and thus for forming a predetermined breaking point of the metal feeder remainder near the surface of the cast part, for example a so-called ME disk can be attached to the outside of the feeder body in the area of the feeder opening.
  • the accessories it would also be possible for the accessories to be arranged in the core boxes in order to be connected to the feeder body produced in this way as soon as the feeder material is injected.
  • the feeder insert then includes in particular the feeder body and the accessories.
  • Figure 1 shows a king in an unexpanded state.
  • the king 7 comprises a mandrel 9 and a membrane 10.
  • the king 7 extends along a longitudinal axis 8 from a root 14 to a free end 15.
  • the non-expanded king 7 is rectangular in its cross-sectional configuration, the membrane 10 extending only over one side wall 13 of the mandrel 9.
  • the membrane 10 is completely attached to the mandrel with its peripheral edge 12. Through lines, not shown, inside the mandrel 9, it is possible to conduct a fluid in an intermediate space 11 between the mandrel 9 and the membrane, so that the membrane 10 and thus the outer contour of the king 7 is widened.
  • FIG. 3 shows the use of a similar king 7 with core boxes (not shown) of a core shooting machine.
  • the core boxes each have a partial cavity which, in a merged state, forms a cavity with an inner wall 18, this inner wall defining the outer contour of the feeder body 2 that provides the heart.
  • exothermic and / or insulating feeder material is injected between the inner wall 18 of the cavity formed by the core boxes and the outer contour of the expanded king 7.
  • a correspondingly widened king 7 is shown with an inserted feeder body 2, the core boxes, which define the outer contour of the feeder body 2, not being shown.
  • a feeder insert 1 which comprises the feeder body 2 and an ME disk 16.
  • the feeder body 2 has a feeder cavity 3 and a feeder opening 4, via which the feeder cavity 3 is connected to a mold cavity, not shown, of a casting mold during the casting process.
  • the feeder opening 4 defines an axis 5, whereby it can be clearly seen that the diameter of the feeder cavity 3 is larger than the diameter of the feeder opening 4.
  • Such a feeder insert 1 is used in particular in vertically divided casting molds, in which the feeder insert 1 during the Casting process is aligned with its axis horizontally. During the casting process, the feeder insert 1 is therefore.
  • the Williams strip 6 formed on the circumferential surface of the feeder cavity 3 serves as a hotspot for the liquid metal.
  • a feeder body having an asymmetrical feeder cavity can be manufactured in one piece in just one manufacturing process, so that the outlay for manufacturing such a feeder body is significantly simplified.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (15)

  1. Manchon pour masselotte (1) destiné à être utilisé lors de la coulée des métaux dans un moule, comprenant un corps de masselotte (2), comportant
    - une cavité de masselotte (3) pour recevoir du métal liquide et
    - une ouverture de masselotte (4) pour relier la cavité de masselotte (3) à une cavité de moule du moule de coulée pendant l'opération de coulée,
    sachant que
    - la cavité de masselotte (3) comporte dans au moins une partie de zone, un diamètre plus grand que le diamètre de l'ouverture de masselotte (4),
    - le corps de masselotte (2) est composé d'un matériau de masselotte isolant et/ou exothermique,
    - le corps de masselotte (2) est constitué en une seule pièce,
    - l'ouverture de masselotte (4) définit un axe (5) et caractérisé en ce que
    - la cavité de masselotte (3) est constituée asymétrique par rapport à l'axe (5).
  2. Manchon pour masselotte (1) selon la revendication 1, sachant que la cavité de masselotte (3) comporte sur sa surface périphérique un emplacement minimal (6), qui comporte une distance plus faible par rapport à l'axe (5) que les emplacements voisins axialement dans deux directions sur la surface périphérique.
  3. Manchon pour masselotte (1) selon la revendication 2, sachant que l'emplacement minimal (6) est constitué de façon ponctuelle ou linéaire.
  4. Manchon pour masselotte (1) selon l'une quelconque des revendications précédentes, sachant que l'ouverture de masselotte (4) comporte une configuration rectangulaire en section avec des parois d'ouverture de masselotte parallèles.
  5. Manchon pour masselotte (1) selon l'une quelconque des revendications précédentes, sachant que l'asymétrie de la cavité de masselotte (3) s'étend au maximum sur 150° dans un plan de coupe orthogonalement par rapport à l'axe (5).
  6. Procédé de fabrication d'un corps de masselotte (2) monobloc d'un manchon pour masselotte (1), comprenant les étapes suivantes :
    - formation d'au moins une première partie de cavité dans une première boîte et d'une deuxième partie de cavité dans une deuxième boîte,
    - assemblage d'au moins la première boîte et de la deuxième boîte de telle sorte que la première partie de cavité et la deuxième partie de cavité forment une cavité avec une paroi intérieure (18), sachant que la paroi intérieure (18) forme au moins en partie le contour extérieur du corps de masselotte (2) à fabriquer,
    - mise au point d'une pièce maîtresse (7) expansible de façon réversible dans la cavité,
    - expansion de la pièce maîtresse (7) de telle sorte que la pièce maîtresse (7) expansée possède une configuration extérieure asymétrique,
    - incorporation de matériau de masselotte exothermique et/ou isolant entre la pièce maîtresse (7) expansée et la paroi intérieure (18) de la cavité pour constituer le corps de masselotte (2), sachant que la pièce maîtresse (7) expansée prédéfinit une configuration d'une cavité de masselotte (3),
    - rétraction de la pièce maîtresse (7),
    - extraction de la pièce maîtresse (7) du corps de masselotte (2) par mouvement relatif entre la pièce maîtresse (7) et le corps de masselotte (2), sachant que la pièce maîtresse (7) rétractée est extraite par l'ouverture de masselotte (4) constituée pendant l'opération d'introduction.
  7. Procédé selon la revendication 6, sachant que l'expansion de la pièce maîtresse (7) a lieu dans une direction et qu'aucune expansion n'a lieu dans la direction opposée.
  8. Pièce maîtresse (7) pour la fabrication d'un corps de masselotte (2) en particulier pour la réalisation du procédé selon l'une quelconque des revendications 6 ou 7, sachant que la pièce maîtresse (7) est expansible de façon réversible dans son contour extérieur et s'étend dans un état non expansé le long d'un axe longitudinal central (8), caractérisée en ce que la pièce maîtresse (7) possède dans un état expansé, une configuration extérieure asymétrique par rapport ,à l'axe longitudinal (8).
  9. Pièce maîtresse (7) selon la revendication 8, sachant que la pièce maîtresse (7) asymétriquement expansée comporte sur sa surface expansée un emplacement minimal (17), qui comporte une distance plus faible par rapport à l'axe longitudinal (8) que les emplacements axialement voisins dans deux directions sur la surface expansée.
  10. Pièce maîtresse (7) selon la revendication 8 ou 9, sachant que la pièce maîtresse (7) comporte dans un état non expansé une configuration rectangulaire en section avec des parois latérales parallèles (13).
  11. Pièce maîtresse (7) selon l'une quelconque des revendications 8 à 10, sachant que la pièce maîtresse (7) comprend un mandrin fixe (9) et une membrane (10) souple, fixée au mandrin (9), qui peut être expansée par introduction d'un fluide dans un espace intermédiaire (11) situé entre la membrane (10) et le mandrin (9).
  12. Pièce maîtresse (7) selon la revendication 11, sachant que la membrane (10) est fixée au mandrin (9) avec ses bords périphériques (12) tant en direction axiale qu'en direction périphérique.
  13. Pièce maîtresse (7) selon la revendication 11 ou 12, sachant que la membrane (10) est reliée sur son côté intérieur au mandrin (9) dans une zone expansible de telle sorte que l'expansion de la membrane (10) est localement limitée.
  14. Pièce maîtresse (7) selon l'une quelconque des revendications 11 à 13, sachant que la membrane (10) n'est disposée que sur une paroi latérale (13) de la pièce maîtresse (7).
  15. Boîte à noyaux pour la fabrication d'un corps de masselotte (2), en particulier pour la réalisation du procédé selon l'une quelconque des revendications 6 ou 7, comportant au moins une première boîte et une deuxième boîte ainsi qu'une pièce maîtresse (7) réglable dans les boîtes selon l'une quelconque des revendications 8 à 14.
EP19156932.6A 2019-02-13 2019-02-13 Insert de masselotte, procédé de fabrication d'un corps de masselotte pour un insert de masselotte ainsi que pièce maîtresse et boîte à noyaux destinés à la fabrication d'un corps de masselotte Active EP3695917B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19156932.6A EP3695917B1 (fr) 2019-02-13 2019-02-13 Insert de masselotte, procédé de fabrication d'un corps de masselotte pour un insert de masselotte ainsi que pièce maîtresse et boîte à noyaux destinés à la fabrication d'un corps de masselotte
PL19156932T PL3695917T3 (pl) 2019-02-13 2019-02-13 Wkładka zasilacza, sposób wytwarzania korpusu zasilacza dla wkładki zasilacza jak i rdzeń oraz rdzennica do wytwarzania korpusu zasilacza
US16/788,946 US11358212B2 (en) 2019-02-13 2020-02-12 Riser sleeve, method for producing a riser body for the riser sleeve as well as an expander element and core box for producing a riser body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19156932.6A EP3695917B1 (fr) 2019-02-13 2019-02-13 Insert de masselotte, procédé de fabrication d'un corps de masselotte pour un insert de masselotte ainsi que pièce maîtresse et boîte à noyaux destinés à la fabrication d'un corps de masselotte

Publications (2)

Publication Number Publication Date
EP3695917A1 EP3695917A1 (fr) 2020-08-19
EP3695917B1 true EP3695917B1 (fr) 2021-11-03

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EP19156932.6A Active EP3695917B1 (fr) 2019-02-13 2019-02-13 Insert de masselotte, procédé de fabrication d'un corps de masselotte pour un insert de masselotte ainsi que pièce maîtresse et boîte à noyaux destinés à la fabrication d'un corps de masselotte

Country Status (3)

Country Link
US (1) US11358212B2 (fr)
EP (1) EP3695917B1 (fr)
PL (1) PL3695917T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202022104611U1 (de) 2022-08-15 2022-08-22 Demin Srm Gmbh Feeder für Eisen- und Stahlguss

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1256360B (de) * 1965-04-08 1967-12-14 Fritz Winter Verfahren und Vorrichtung zum Ausformen eines Kugelsteigers
DE8702296U1 (fr) 1987-02-14 1987-04-09 L. Bregenzer Giessereibedarf Gmbh & Co, 7000 Stuttgart, De
DE102013209775B3 (de) 2013-05-27 2014-10-23 Chemex Gmbh Speisereinsatz
WO2016050264A1 (fr) * 2014-09-29 2016-04-07 Gtp Schäfer Giesstechnische Produkte Gmbh Insert d'alimentation destiné à un moule de coulée divisé verticalement
DE102015115437A1 (de) 2015-09-14 2017-03-16 GTP Schäfer Gießtechnische Produkte GmbH Verfahren zur Herstellung eines Speisers in einer Kernschießmaschine und zur Durchführung des Verfahrens geeigneter Kernkasten
CN206869021U (zh) * 2017-06-08 2018-01-12 佛山市南海奔达模具有限公司 新型冒口及其应用的铸造模具

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US11358212B2 (en) 2022-06-14
EP3695917A1 (fr) 2020-08-19
PL3695917T3 (pl) 2022-02-21
US20200254510A1 (en) 2020-08-13

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