EP2803426A1 - Procédé de compactage de sable de moulage pour la fabrication d'un moule en sable - Google Patents

Procédé de compactage de sable de moulage pour la fabrication d'un moule en sable Download PDF

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Publication number
EP2803426A1
EP2803426A1 EP13168019.1A EP13168019A EP2803426A1 EP 2803426 A1 EP2803426 A1 EP 2803426A1 EP 13168019 A EP13168019 A EP 13168019A EP 2803426 A1 EP2803426 A1 EP 2803426A1
Authority
EP
European Patent Office
Prior art keywords
mold
mold box
model
box half
molding sand
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Withdrawn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
EP13168019.1A
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German (de)
English (en)
Inventor
Frank Iburg
Gelson Günther Montero
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.)
Kuenkel Wagner Germany GmbH
Original Assignee
Kuenkel Wagner Prozesstechnologie 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 Kuenkel Wagner Prozesstechnologie GmbH filed Critical Kuenkel Wagner Prozesstechnologie GmbH
Priority to EP13168019.1A priority Critical patent/EP2803426A1/fr
Publication of EP2803426A1 publication Critical patent/EP2803426A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing

Definitions

  • the present invention relates to methods for producing a sand mold for casting a particular cup-shaped casting, z.
  • a brake drum in a molding box with a first mold box half and a second mold box half in an automatic molding plant.
  • a cup or trough-shaped casting in the context of the present application is to be understood in the broadest sense, a three-dimensional hollow body having an at least partially open side.
  • the casting may, for example, have the shape of a hollow pyramid, a hollow cube, a hollow partial sphere, a hollow cylinder or a hollow cone and geometrical modifications of these basic forms, such a body being at least partially open on at least one side or having an opening.
  • An example of such a casting is a brake drum or similar shaped member having a substantially cup-shaped configuration with a cup bottom and an adjoining wall portion protruding from the cup bottom plane.
  • the molding sand of the upper and lower box of a casting mold is first precompressed by means of a mechanical pressing force acting from below, ie from the model plate or the model plate carrier.
  • a mechanical pressing force acting from below ie from the model plate or the model plate carrier.
  • the molding sand primarily compacts in close-to-model areas, whereas it is less pre-compacted in regions further from the model plate or the model plate carrier because of the already described shielding by already densified areas in the vicinity of the model.
  • a pre-compaction in the near-model area is achieved and the final compaction of these close-to-model areas is decisively improved in a subsequent densification.
  • a brake drum to create in a molding box with a first mold box half and a second mold box half in an automatic molding plant which does not have the aforementioned disadvantages.
  • a method for producing a sand mold for casting a particular cup-shaped casting, z As a brake drum, in a molding box with a first mold box half and a second mold box half in an automatic molding plant, wherein a first mold box half and a second mold box half are each first paired with a model and subsequently filled with uncompressed molding sand, wherein the uncompressed molding sand in the first mold box half is precompressed by means of an air stream guided through the first mold box half, in particular by means of an air flow introduced from the side opposite the model into the molding sand, which flows through the molding sand in the direction of the model and escapes through vents in the model or in a model plate or a model carrier, wherein the undensified molding sand located in the second mold box half by means of a mechanical pre-seal is applied by pressing pressure applied from the model-side side of the second mold box half of pre-compressed and each subsequent to the located in the first and in
  • a mold box half in the sense of the present application is usually referred to as upper box or lower box.
  • the term mold box half can therefore in the present application designate both a lower box and an upper box. Where a distinction or exact designation of upper and lower box is necessary, the more specific names upper and lower box are used instead of the general term form box half.
  • the orientation in which the casting is poured is determined and determined relative to the gravitational field of the earth by the shape of the casting and the casting process.
  • brake drums are poured in an orientation in which the cup bottom is arranged in a horizontal plane and is below the cup wall extending from the cup bottom plane.
  • the open side of the casting is at the top and the melt rises from the bottom of the cup into the cup wall from bottom to top.
  • the casting half-mold located in the lower box is therefore also cup-shaped with a depression in its inner region, which is surrounded by relatively thin mold walls, and forms the outer contour of the cup-shaped casting or the brake drum.
  • the casting half-mold located in the upper box forms the inner contour of the cup-shaped casting or the brake drum and is relatively compact and solid.
  • the inventive method is preferably carried out in an automatic molding plant within an automatic casting plant.
  • both the molding sand in the upper box and the mechanically pre-compacted in the lower box, so that only the upper box mechanically and the lower box is precompressed by an air flow according to the invention, in a brake drum material between 2% and 6% - depending on Geometry of the brake drum - can be saved.
  • These material savings are due to a better Stamm the sand mold, that is, due to the specifically adapted to the respective mold half precompression can be molded dimensionally accurate, and shape changes of the sand mold during the casting process can be reduced.
  • the method is to integrate without problems in an automatic casting, so that no elaborate conversions are required at a casting change on the casting.
  • the first mold box half in particular for producing sand molds for brake drums, is a lower box and the second mold box half is a top box.
  • the first mold box half may also be a top box and the second mold box half may be a bottom box. How to assign the terms top box and bottom box to the first box half and second box half terms depends on the shape and location of the casting in the sand mold.
  • the air flow pre-compression can be done in different ways. It is particularly advantageous if the pre-compression takes place by applying a stream of air to the uncompacted molding sand located in the molding box half from above, ie from the side opposite the pattern plate. The air stream flows through the uncompacted molding sand from top to bottom, ie in the direction of the model, whereby particles of molding sand are moved and brought closer to the model, ie closer to the model.
  • the pre-compression can be done in particular as pulse compression.
  • the first mold box halves and the second mold box halves are arranged alternately (OK-UK-OK-UK) in succession on a transport system, in particular push transport system, and fed to a model changing device in which a first mold box half with a dedicated model or a second mold box half is paired with a dedicated model.
  • a model for a first mold box half may be positioned (or immediately above or below) in the path of the transport system, and a first mold box half transported by the transport system to the mold position such that the model and the first mold box half are aligned with each other for a filling with molding sand and paired.
  • molding sand can then be filled in the first mold box half positioned on the model and pre-compressed and pre-compressed. After densification, the model is removed from the first mold box half.
  • a model change can be carried out, the model intended for the first mold box half being removed from the mold position and a model intended for a second mold box half being positioned in the mold position.
  • a model for a second mold box half can then be positioned in a mold position which lies in the path of the transport system.
  • a second mold box half can be transported to the mold position by means of the transport system, so that the model and the second mold box half are aligned with each other for filling with molding sand and are paired. Subsequently, in the molding position, molding sand can be filled into the second mold box half positioned on the model and pre-compacted.
  • FIG. 1 shows an example of a brake drum 1 as a cup-shaped casting in the casting position.
  • the brake drum 1 has a drum base 2 (as a cup bottom) and a drum wall 3 (as a cup wall).
  • FIG. 1 shows the brake drum in the casting position according to their orientation in the gravitational field of the earth, to illustrate the orientation, the direction of gravitational acceleration is indicated by the arrow g.
  • the drum base 2 is located below the drum wall 3, which extends from the drum base 2 upwards.
  • FIG. 1 shows schematically indicated a sprue with top 5 sprue 19, is poured over the melt from above into the mold.
  • the casting mold is a sand mold 8, which consists essentially of a lower mold 6 and an upper mold 7.
  • the lower mold 6 is arranged in a lower box 9 and the upper mold 7 in an upper box 10.
  • the division line T between upper mold 7 and lower mold 6 is in the FIG. 1 characterized.
  • the lower mold 6 encloses the entire outer side of the brake drum 1 up to its widest point on a shoulder 11 FIG. 1 the upper side 14 and the lower side 15 of the lower mold 6 are marked.
  • the lower mold 6 has a substantially cup-shaped shape whose geometry depends on that of the lower box 9 as well as the outer contour of the brake drum 1.
  • the laterally adjacent to the drum wall 3 areas 12a, b of the lower mold 6 have a relatively large ratio of height H to width B (both marked in the figure). Because of this large height-width ratio, the regions 12a, b are critical in compacting the molding sand, since material displacements can not proceed unhindered due to the narrow cross-section of the mold and the large depth of the mold.
  • the upper mold 7 fills the entire inner space 4 of the brake drum 1.
  • the upper side 16 and the lower side 17 of the upper mold 7 are marked. It adjoins the lower mold 6 outside the brake drum 1 at the dividing line T.
  • the shape of the upper mold 7 is mushroom-shaped with a substantially cylindrical inner region 18 with a beveled cylinder edge in the lower region. There are no bottlenecks that are problematic in a compression of the molding sand of the upper mold 7.
  • the brake drum 1 can be cast with the highest possible quality and dimensionally accurate, it is particularly important in the compression of upper mold 7 and lower mold 6 that their to the model (the brake drum 1) adjacent areas are adequately compacted. Of particular importance are the laterally adjacent to the drum wall 3 areas 12a, b of the lower mold 6 and the cylindrical inner portion 18 of the upper mold 7. If these areas are not sufficiently compacted, it comes during casting due to the pressure exerted by the molten metal fluid pressure to a widening of This is an undesirable waste of material (potted metal) and requires mechanical reworking of the cast brake drum 1.
  • pre-compaction of the foundry sand takes place both in the production of the lower mold 6 and in the production of the upper mold 7.
  • the precompression takes place individually matched to the geometry of top mold and bottom mold, each with specific precompression.
  • the precompression of the molding sand of the lower mold takes place by means of an air flow guided through the molding sand, while the molding sand of the upper mold is pre-compacted mechanically from the underside 17 thereof by means of hydraulic compacting pressure.
  • FIGS. 2 and 3 show a section of an automatic casting, which is adapted to carry out the method according to the invention.
  • an automatic molding machine 30 having a hydraulic multi-punch pressing device 31 and a model changing device 32.
  • Form boxes are separated in a cutting device 22 by the upper box 10 is lifted from the lower box 9 and subsequently upper box 10 and lower box 9 separately conveyed by means of a Schubtransportsystems 33 to cleaning devices 34, where they and in particular their guides and dividing surfaces are cleaned.
  • upper boxes 10 and lower boxes 9 are arranged alternately one after the other (OK-UK-OK-UK). They are conveyed to the model changing device 32, in each of which an associated model is associated with it, which is possibly placed on model plate carriers, not shown.
  • the model changing device 32 has a turntable on which at least one model for a lower box and at least one model for a top box are arranged. By turning the turntable, the respective model or models are brought under the corresponding molding box and subsequently paired with this. The allocation and pairing of the models and mold box halves takes place in the in FIG. 2 marked mold position 35.
  • this mold position 35 takes place after the mating of the model and mold half a filling with molding sand via an automatic filling device 36 with sand bunker 37.
  • the precompression takes place by applying pressure from below by means of hydraulic press cylinders, for example by moving the model, the model plate or the model plate carrier upwards relative to the upper box 10. This results in a compaction of the molding sand primarily in the lower area near the model or the model plate.
  • a lower box 9 is located in the mold position 35, the pre-compression takes place by passing compressed air from above, ie from the side of the lower box opposite the model or the model plate, into the molding sand contained therein. There is a promotion of the molding sand in particular in the areas 12a, b, which achieves better Vorverdichtungsresultate compared to a mechanical pre-compression from above or from below. After precompression, the respective upper box 10 or lower box 9 remains in the mold position 35, where the subsequent or final compaction of the molding sand takes place.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
EP13168019.1A 2013-05-16 2013-05-16 Procédé de compactage de sable de moulage pour la fabrication d'un moule en sable Withdrawn EP2803426A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13168019.1A EP2803426A1 (fr) 2013-05-16 2013-05-16 Procédé de compactage de sable de moulage pour la fabrication d'un moule en sable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13168019.1A EP2803426A1 (fr) 2013-05-16 2013-05-16 Procédé de compactage de sable de moulage pour la fabrication d'un moule en sable

Publications (1)

Publication Number Publication Date
EP2803426A1 true EP2803426A1 (fr) 2014-11-19

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EP13168019.1A Withdrawn EP2803426A1 (fr) 2013-05-16 2013-05-16 Procédé de compactage de sable de moulage pour la fabrication d'un moule en sable

Country Status (1)

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EP (1) EP2803426A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0995521A1 (fr) * 1998-10-19 2000-04-26 Josef Mertes Machine à mouler pour fonderie

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0995521A1 (fr) * 1998-10-19 2000-04-26 Josef Mertes Machine à mouler pour fonderie

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