EP3368234A1 - Mandrin de formage doté d'une enveloppe pouvant être élargie et modèle de coulée doté d'un mandrin de formage ainsi que procédé de coulée de métaux - Google Patents

Mandrin de formage doté d'une enveloppe pouvant être élargie et modèle de coulée doté d'un mandrin de formage ainsi que procédé de coulée de métaux

Info

Publication number
EP3368234A1
EP3368234A1 EP16782282.4A EP16782282A EP3368234A1 EP 3368234 A1 EP3368234 A1 EP 3368234A1 EP 16782282 A EP16782282 A EP 16782282A EP 3368234 A1 EP3368234 A1 EP 3368234A1
Authority
EP
European Patent Office
Prior art keywords
casting
model
mandrel
feeder
mold
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
EP16782282.4A
Other languages
German (de)
English (en)
Other versions
EP3368234B1 (fr
Inventor
Thomas Schäfer
Jörg Schäfer
Thomas Baginski
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.)
Filing date
Publication date
Application filed by GTP Schaefer Giesstechnishe Produkte GmbH filed Critical GTP Schaefer Giesstechnishe Produkte GmbH
Publication of EP3368234A1 publication Critical patent/EP3368234A1/fr
Application granted granted Critical
Publication of EP3368234B1 publication Critical patent/EP3368234B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

Definitions

  • the invention relates to a forming mandrel for application to a casting mold used in the manufacture of a casting mold used in casting metal, comprising a foot resting on the model surface of the casting model and a receiving region disposed on the base for receiving a mold to be formed therein during manufacture of the casting mold Feeder, wherein the feeder is fitted with a trained in his casting model bottom surface feeder opening before molding on the mandrel. Furthermore, the invention relates to a cast model having a corresponding mandrel and a method for casting metals using a corresponding casting model.
  • the feeders In foundry technology, it is often necessary to arrange additional feeders in the casting molds, whose feeder body fills with the liquid metal during casting of the casting and compensates for volume deficits which occur during the solidification of the casting in order to prevent voids being formed in the casting.
  • the feeders must be such that the liquid metal fed into them later solidifies as the casting, so that during the solidification process a material transport to the casting can take place, which tightly feeds the casting.
  • the feeders consist of an exothermic and / or insulating material.
  • the feeders with an arbitrary geometric shape are arranged at the point to be fed of the later casting on the casting model and firmly formed during the production of the casting mold by compaction of an introduced molding material.
  • the feeder during molding so-called Aufformdorne are known, the are mounted on the model surface of the respective casting model.
  • Such a mandrel with the generic features is known for example in a training as a so-called spring mandrel from DE 10 2010 022 834 B4, which is also described in this document, the technical background for the arrangement of feeders and the use of Aufformdornen.
  • the statements in DE 10 2010 022 834 B4 are incorporated by reference into the disclosure of the present application.
  • the refractive cores usually produced by shooting in a shooting machine are disc-shaped, wherein the passage opening is formed by a constriction formed in the disc-shaped crusher core body, thereby to provide a predetermined breaking point for breaking the riser from the surface of the casting.
  • Such an arrangement of the feeder with a breaker core is for example from the
  • the feeder As far as when shaping the feeder in the mold, the feeder moves due to the pressure exerted mold in the direction of the casting model, the feeder including a refractive core optionally attached to him is usually not on the model surface to the plant, but remains in a more or less large Distance to stand. After demoulding the casting model with mandrel, the remaining cavity during the casting process with the liquid Me- filled so that the predetermined breaking point provided by the breaker core is located at a corresponding distance from the surface of the cast-off casting. The resulting, more or less large riser must then be eliminated by elaborate cleaning work.
  • the invention is therefore an object of the invention to provide a mandrel for fixing a feeder during the Einform perspectives available by dispensing with the use of an additional refractive core or other, one of the feeder opening associated constriction forming components and yet a smaller feeder neck and a simple connected thereto Separation of the feeder remainder near the casting surface is made possible.
  • the invention initially provides a forming mandrel having the features mentioned above, in which a mandrel enclosing at least its base and / or a portion of its receiving area for the feeder, elastically expandable and the end of the mandrel directly on the foot adjacent to the model surface adjacent enclosure is mounted such that the widened before the beginning of the molding envelope bridges a still existing after molding of the feeder distance between the model surface and bottom surface of the feeder, so that after demolding of casting model with attached thereto shaping mandrel from the mold a through the contour of the widened envelope is formed predetermined break point for a remaining after completion of the casting process feeder remainder.
  • the advantage with the embodiment of the forming mandrel according to the invention is that, owing to the sheath adjoining the model surface immediately at one end and widened during the forming process, closing after demolding of the casting model including the forming mandrel on the surface of the casting later a constriction having approximately the diameter of the foot of the mandrel is formed as a predetermined breaking point for the subsequent knocking off of the feeder remainder directly to the casting surface.
  • a constriction having approximately the diameter of the foot of the mandrel is formed as a predetermined breaking point for the subsequent knocking off of the feeder remainder directly to the casting surface.
  • the intermediate space between the sheath and the mandrel is connected to a supply line for a medium to be introduced into the intermediate space, wherein, according to a further embodiment of the invention, this supply line is also designed as a discharge for the medium introduced into the intermediate space can be. Alternatively, it can be provided that a separate discharge for the medium introduced into the intermediate space is connected to the intermediate space.
  • the elastically expandable sheath is formed as a membrane made of a suitable rubber or plastic mixture.
  • the forming mandrel is designed as a rigid mandrel. In this case, it may behave so that it does not come to a deformation of the feeder on the Aufformdorn during molding and as far as the Aufformtik is intercepted in the head of the feeder. Alternatively, however, a certain displacement of the feeder on the shaping mandrel may be permitted, in the course of which the upper end of the shaping mandrel reaching into an inner cavity as the feeder volume of the feeder penetrates the cover region of the feeder opposite the bottom surface during its displacement on the forming mandrel.
  • the shaping mandrel is designed as a spring mandrel with a relative to its foot against spring force displaceable receiving area for the feeder. It can be provided that the forming mandrel formed as a spring mandrel is formed with an insertable into the casting model foot, as is known from the generic DE 10 2010 022 834 B4.
  • the invention furthermore relates to the use of a shaping mandrel configured according to the invention with a casting model, wherein the shaping mandrel has the correspondingly disclosed elastically expandable sheath which is connected at the end to the foot of the shaping mandrel.
  • a mandrel is screwed in use in a mounted on the model surface of the casting model bore or otherwise attached to the model surface, so that the Aufformdorn located expandable sheath when forming a feeder then at the beginning of the molding process in the expanded state, the existing distance between the casting model and bridged the bottom surface of the mounted on the mandrel mandrel.
  • Another object of the invention relates to a casting model for the production of molds, in which a trained according to the features described above forming mandrel is used.
  • the invention relates to a method for casting metals by means of a casting mold, wherein a casting model is provided with a formed thereon, formed according to the features described above forming mandrel.
  • a shaping mandrel having an elastically expandable covering necessitates a change in the otherwise usual procedure for a rigid mandrel or a so-called mandrel.
  • a feeder is attached to the mandrel, and it is then placed on the mandrel located envelope in its expanded state.
  • the casting model including the feeder fixed thereto by seating on the mandrel
  • the casting model is formed by introducing a molding material into the casting mold, then the shell is returned to its original, unexpanded state, and subsequently the casting model, including mandrel, is removed from the casting mold.
  • the cavity formed in the mold is filled with liquid metal, and upon solidification of the metal, the riser remaining on the metal surface of the casting is knocked off at the predetermined breaking point created by the contour of the envelope widened during the forming of the model surface.
  • Fig. 1 one on a correspondingly indicated model surface of a
  • FIG. 2 shows the object of FIG. 1 with the envelope in an expanded state
  • FIG. FIG. 3 shows the article of FIG. 2 with molding material filled in the casting mold before the mold pressure has acted
  • FIG. 4 shows the object of FIG. 3 after the action of the molding pressure
  • FIG. 5 shows the article of FIG. 4 with the covering returned to the initial state according to FIG. 1, prior to removal of the casting model including the forming mandrel, FIG.
  • Fig. 6 remaining after the casting process on the cast iron riser including the trained by the enclosure breaking point.
  • FIG. 1 shows only schematically a casting model 10 with a model surface 11, on which a shaping mandrel 12 is fastened.
  • the shaping mandrel 12 has a foot 13 and a receiving area 14 arranged above the foot, which ends in a point 15.
  • a feeder 16 is mounted, which has a circumferential side wall 18, a lid portion 19 and a bottom surface 17. Inside the feeder 16, an inner cavity 31 is formed as a feeder volume.
  • a feeder opening 20 is further arranged, via which the liquid metal can flow into the inner cavity 31 during the casting process or can flow away therefrom.
  • an elastically expandable sheath 21 in the form of a membrane made of a suitable rubber or plastic mixture is arranged with its one end 22 at the foot 13 of the mandrel 12 in the immediate vicinity of the model surface 1 1 and with its other end 23 is secured to an upper location of the receiving area 14 of the forming mandrel 12, thereby enclosing the corresponding area of the forming mandrel 12. It can be seen that between the enclosure 21 and the mandrel 12, a gap 30 is formed.
  • the enclosure 21 can be brought into the intermediate space 30 by introducing a gaseous or liquid medium into the expanded state shown in FIG. 2 via a feed and discharge line (not shown). It can be seen that the side region of the enclosure 21 by a corresponding reinforcement 24 is reinforced, as far as under the action of the molding pressure of the feeder 16 shifts relative to the fixed mandrel 12 in the direction of the model surface 1 1 and thereby slides over the outer contour of this secured with a reinforcement 24 enclosure 21.
  • Fig. 4 the position of the feeder 16 is shown on the mandrel 12 after the application of the molding pressure and completion of the molding process, and it can be seen that the bottom surface 17 of the feeder 16 is still at a certain distance from the model surface 1 1, wherein this distance is still bridged by the widened enclosure 21. It can also be seen that, due to the connection of the lower end 22 of the wrapper 21, a gusset 27 formed by the molding material 25 has settled in this region on the foot 13 of the shaping mandrel resting on the model surface.
  • the casing 21 is returned to its original shape as shown in FIG. 1 by draining the medium introduced, for example, into the intermediate space 30.
  • This condition is shown in FIG. It can be seen from FIG. 5 that the contour 26 of the molding material 25 formed by the widened casing during molding remains maintained, which also applies to the gusset 27. It is readily apparent that after demoulding the casting model 10 including mandrel 12 from the mold, the resulting cavities are filled with the liquid metal. Thus, the hot metal flows during the casting over the of Reforming mandrel in the molding material free path in the inner cavity 31 of the feeder 16 and back.
  • the feeder remainder 28 has a predetermined breaking point 27a formed by the gusset 27, which lies directly on the surface of the cast part 29. At this predetermined breaking point 27a, the feeder remainder 28 can be knocked off, a cleaning effort still required for smoothing the surface of the cast part 29 being correspondingly low.
  • the representation of the feeder is retained in Fig. 6, although the feeder largely loses its illustrated shape during the casting process.
  • the mandrel can also be designed as a so-called spring mandrel according to DE 10 2010 022 834 B4, wherein it also comes to a displacement of the feeder 16 in the direction of the model surface 1 1, but without piercing the lid portion of the feeder.
  • the advantageous function of the mandrel 12 according to the invention is also given when the mandrel 12 is formed as a rigid mandrel and caused by the force acting in forming the feeder molding pressure force is intercepted in the head of the mandrel 12 and it does not cause a shift of the feeder 16 comes on the mandrel 12. Also in this case, the widened enclosure 21 provides for the formation of a corresponding predetermined breaking point 27a.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

L'invention concerne un mandrin de formage (12) destiné à être placé sur un modèle de coulée (10) moulé dans un moule de coulée lors de la fabrication de ce moule de coulée utilisé lors de la coulée de métaux. Le mandrin de formage selon l'invention comprend un pied (13) se dressant sur la surface (11) du modèle de coulée (10) et une région de réception (14) disposée sur le pied (13) et destinée à recevoir une masselotte (16) à mouler dans le moule de coulée lors de la fabrication de celui-ci, la masselotte (16) étant enfichée sur le mandrin de formage (12) avant le moulage par une ouverture de masselotte (20) réalisée dans sa surface de fond (17) tournée vers le modèle de coulée (10). Le mandrin de formage est caractérisé en ce qu'une enveloppe (21) est fixée sur le mandrin de formage (12), laquelle enveloppe entoure au moins le pied (13) du mandrin de formage et/ou une région partielle de sa région de réception (14) pour la masselotte (16), peut être élargie élastiquement et est raccordée du côté de son extrémité au pied (13) du mandrin de formage (12) de manière immédiatement adjacente à la surface de modèle (11), de telle sorte que l'enveloppe (21) élargie avant le début du moulage surmonte une distance, encore existante après le moulage de la masselotte (16), par rapport à la surface de modèle (11), de telle sorte qu'après le démoulage, hors du moule de coulée, du modèle de coulée (10) doté du mandrin de formage (12) placé sur celui-ci, un point de rupture théorique (27a) formé par le contour (26) de l'enveloppe (21) élargie soit réalisé pour un reste de maselotte (28) demeurant une fois l'opération de coulée terminée.
EP16782282.4A 2015-10-27 2016-10-19 Mandrin de formage doté d'une enveloppe pouvant être élargie et modèle de coulée doté d'un mandrin de formage ainsi que procédé de coulée de métaux Active EP3368234B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015118335 2015-10-27
PCT/EP2016/075091 WO2017072004A1 (fr) 2015-10-27 2016-10-19 Mandrin de formage doté d'une enveloppe pouvant être élargie et modèle de coulée doté d'un mandrin de formage ainsi que procédé de coulée de métaux

Publications (2)

Publication Number Publication Date
EP3368234A1 true EP3368234A1 (fr) 2018-09-05
EP3368234B1 EP3368234B1 (fr) 2020-08-26

Family

ID=57144996

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16782282.4A Active EP3368234B1 (fr) 2015-10-27 2016-10-19 Mandrin de formage doté d'une enveloppe pouvant être élargie et modèle de coulée doté d'un mandrin de formage ainsi que procédé de coulée de métaux

Country Status (2)

Country Link
EP (1) EP3368234B1 (fr)
WO (1) WO2017072004A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019102449A1 (de) * 2019-01-31 2020-08-06 Chemex Foundry Solutions Gmbh Einteiliger Speiserkörper zur Verwendung beim Gießen von Metallen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0325134D0 (en) * 2003-10-28 2003-12-03 Foseco Int Improved feeder element for metal casting
DE102008009730A1 (de) 2008-02-19 2009-08-20 AS Lüngen GmbH Speiser mit eingestecktem Brechkern
DE102010022834B4 (de) 2010-06-07 2012-05-31 Ask Chemicals Feeding Systems Gmbh Federdorn und Gießmodell mit Federdorn

Also Published As

Publication number Publication date
EP3368234B1 (fr) 2020-08-26
WO2017072004A1 (fr) 2017-05-04

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