EP1775045B1 - Insert pour masselotte pour une moule de coulage - Google Patents

Insert pour masselotte pour une moule de coulage Download PDF

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Publication number
EP1775045B1
EP1775045B1 EP06020665A EP06020665A EP1775045B1 EP 1775045 B1 EP1775045 B1 EP 1775045B1 EP 06020665 A EP06020665 A EP 06020665A EP 06020665 A EP06020665 A EP 06020665A EP 1775045 B1 EP1775045 B1 EP 1775045B1
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EP
European Patent Office
Prior art keywords
feeder
feeder insert
recess
insert
breaking point
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
EP06020665A
Other languages
German (de)
English (en)
Other versions
EP1775045A2 (fr
EP1775045A3 (fr
Inventor
Martin Pollakowski
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.)
Hofmann Ceramic GmbH
Original Assignee
Hofmann Ceramic 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 Hofmann Ceramic GmbH filed Critical Hofmann Ceramic GmbH
Publication of EP1775045A2 publication Critical patent/EP1775045A2/fr
Publication of EP1775045A3 publication Critical patent/EP1775045A3/fr
Application granted granted Critical
Publication of EP1775045B1 publication Critical patent/EP1775045B1/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

Definitions

  • the invention relates to a feeder insert for placement in a mold used in the casting of metals.
  • the prior art feeder sleeves include a feeder-volume-containing feeder body made of an exothermic and / or insulating material, the feeder body having an inner space bounded by sidewalls and an upper portion as a feeder volume, and a feeder opening in the bottom portion of the feeder body for connection to the mold cavity is trained.
  • the feeders belonging to the prior art have the disadvantage that spring mandrels are often required for forming these feeders. By yielding the spring mandrel, it is possible that the feeder compresses the underlying sand layer during the compression molding process over the spring travel.
  • the state of the art also includes feeders which are merely plugged onto a centering pin. These feeders can not perform any movement in the molding process of the molding sand. These feeders are located directly on the model and thus also on the casting. This has the disadvantage that in the casting process exiting gases from the feeder negatively affect the surface of the casting. In addition, the feeders can break because they can not perform any movement during the molding process of the molding sand and at the same time the molding sand is pressed at high pressure to the feeders.
  • the prior art ( DE 20 2004 009 367 U1 ) includes a feeder with a deformable metal base.
  • This belonging to the prior art feeder has a cylindrical opening in the feeder head at the top.
  • feeders are also known which have no breakthrough at all in the feeder head.
  • the retaining pin is drilled into the cover area and breaks it.
  • These prior art feeders have the disadvantage that the retaining mandrel exerts a force on the inside of the feeder to puncture the feeder.
  • the feeders are very often broken when applying the molding pressure, since the pressure exerted by the retaining mandrel pressure is too large. This is particularly disadvantageous because the feeder can not be completely supplied to its intended use for one.
  • a very large amount of molding sand enters the feeder. This molding sand is flushed into the workpiece during the casting process, so that the workpiece has errors.
  • the state of the art ( DE 42 00 183 A1 ) belonging two-part feeder has a passage opening for the mandrels to be performed of the casting model. These recesses described therein represent the passage openings for the mandrel. Also, this prior art feeder has the disadvantage that when piercing the mandrel uncontrolled breaking out of the feeder head takes place.
  • the prior art ( DE 195 03 456 C1 ) includes an arrangement of a cup-shaped feeder and this with distance on a casting model overlying mandrel.
  • This prior art feeder has a predetermined breaking point in the region of the receiving of the mandrel.
  • a disadvantage of this belonging to the prior art feeders that when piercing the mandrel larger parts of the feeder can break out.
  • the technical problem underlying the invention is to provide a feeder that can be formed without spring mandrels, and ensures a safe molding without damaging the feeder.
  • the feeder insert according to the invention for arrangement in a mold used in the casting of metals with a feeder volume having a feeder body of a Exothermic and / or insulating material having a bounded by sidewalls and an upper portion of the interior space as feeder and a feeder opening in the bottom portion of the feeder body as a connection to the mold cavity, wherein the feeder insert in the upper region has a predetermined breaking point for the penetration of a mandrel and wherein the predetermined breaking point by a Recess is formed in the feeder body, such that the feeder body in the region of the recess has a reduced wall thickness, characterized in that the recess is formed as at least one annular recess.
  • the feeder insert according to the invention ensures a consistent reproducible outbreak on the upper part of the feeder.
  • the embodiment with the annular recess has the advantage that a controlled piercing and breaking of the feeder material is ensured.
  • the diameter of the inner annular recess is equal to or greater than the diameter of the predetermined breaking point.
  • the recess is arranged on an outer surface of the feeder. It can also be arranged on a surface of the inner volume of the feeder insert according to a further advantageous embodiment.
  • the feeder according to the invention is formed, it is no longer necessary to use a spring mandrel, so that the feeder can compress the underlying sand layer over the spring travel in the compression molding, but the feeder is pressed by the pressure acting in the compression molding down.
  • the fixed mandrel which can be used in the feeder according to the invention breaks through the predetermined breaking point in a controlled manner in the upper region, so that the feeder can lower and compact the sand lying beneath it.
  • the predetermined breaking point is formed completely covered by a feeder cap, to prevent that when piercing the mandrel passes through the predetermined breaking point sand in the feeder and later reaches the casting material into the workpiece and forms inclusions.
  • the feeder insert according to the invention has a wall thickness in the region of the recess of less than 70% of the total wall thickness.
  • the feeder insert has a wall thickness in the region of the recess of less than 50% of the total wall thickness.
  • the recess is widening, preferably designed to widen conically. This ensures that little feeder material is present in the region of the recess, so that a consistent reproducible eruption can be produced at the feeder upper part.
  • the diameter of the recess is advantageously at least as large as the diameter of the predetermined breaking point.
  • the feeder has, in addition to the predetermined breaking point, a conically tapering inner contour in the foot region of the feeder insert. If fragments of the feeder insert or molding sand fall into the internal volume of the feeder insert when piercing the feeder insert, these parts can slide down on the inner wall of the feeder insert and fall out of the feeder, at the latest when the mandrel is removed.
  • the feeder insert formed with the predetermined breaking point can be formed in one piece or in several parts.
  • the feeder insert according to the invention can be formed with predetermined breaking point with break core, Reduzierplatte, metal disk, Metallleinschnürung or the like.
  • the feeder insert according to the invention with a predetermined breaking point is designed without a breaker core and has at least one graduation.
  • the feeder is formed divided, it is possible to the division towards the inner volume of the feeder conically widening, whereby a larger internal volume compared to the prior art feeder inserts is achieved and a "slipping" of the debris and the molding sand is ensured from the feeder room.
  • the feeder insert according to the invention is designed without breaker core to be able to do without the break-prone breaker core.
  • the feeder insert with predetermined breaking point is advantageously divided approximately in the middle.
  • the division should advantageously be formed at least in the middle third of the feeder body in a horizontally formed division.
  • At least the pitch should be provided at a distance from a footprint on the casting.
  • the division is provided at least approximately centrally in the feeder body.
  • all intermediate pieces are formed identically, so that the inner volume of the feeder insert can be formed adapted to any requirements.
  • the parts of the feeder body are advantageously positively and / or frictionally connected to each other. This has the advantage that a gluing of the parts of the feeder sleeve is not required.
  • the intermediate pieces with the same form and / or frictional engagement with each other or with the parts of the feeder sleeve are connected. It is also possible to glue the parts together.
  • a kind of dovetail guide In a vertical division as well as a horizontal division, it is also possible to provide a kind of dovetail guide. It is also possible to provide a kind of tongue and groove connection which ensures a connection between the parts of the feeder insert and / or the intermediate pieces via the required frictional engagement.
  • the body of the feeder insert is preferably divided centrally or at least at a distance to a standing surface on the casting, the resulting in the casting process by the adhesive gases do not reach the casting and thus have no effect on the quality of the casting.
  • These are, for example, constrictions provided in the feeder body.
  • This design has the advantage that the feeder body, which may come into contact with the casting during the casting process, leaves as small an impression as possible.
  • an outer contour of the feeder insert is at least partially rounded in order to achieve optimum pressure absorption during the compression molding and when compacting the sand through the feeder insert.
  • the feeder insert with predetermined breaking point is advantageously formed completely from a uniform material, so that the outlay for producing the feeder insert according to the invention is minimized as far as possible.
  • the feeder insert according to the invention with the predetermined breaking point can advantageously be designed as a filter feeder.
  • a filter is arranged in the feeder, and that the feeder, after puncturing with the mandrel, is designed as an upwardly open feeder in order to feed the metal used during the casting through the feeder insert into the casting mold.
  • the feeder insert according to the invention with predetermined breaking point has the advantage that the feeder insert is already open at the top after molding since the mandrel pierces the predetermined breaking point as soon as the feeder insert lowers due to the forming pressure that occurs.
  • Fig. 1 to 8 show various embodiments of feeder inserts without annular recess.
  • Fig. 1 shows a feeder insert 1 in the manner of Aufformspeisers, which is arranged on a mandrel 2 of a casting model 3 of a workpiece (not shown).
  • the feeder insert has a predetermined breaking point 16 in the upper region 15. By a molding pressure, the mandrel 2 is pressed by the predetermined breaking point 16, such that the material of the feeder insert 1 is pierced in the region of the predetermined breaking point.
  • the predetermined breaking point is formed by a recess 29.
  • the predetermined breaking point 16 is pierced by the fixed mandrel 2, when the feeder sleeve 1 is lowered during the compression molding in the direction of arrow A.
  • the feeder insert 1 has a partition 4 and thus an upper part 5 and a lower part 6.
  • the parts 5, 6 form an inner space 7.
  • the conical extension 31 has the advantage that molding sand or fragments of the predetermined breaking point 16, which may fall down when piercing the predetermined breaking point 16 by means of the mandrel 2, slide down on the conically tapered feeder inner wall 31 and fall out of the feeder insert 1 and thus it is ensured that the feeder insert 1 is "clean" inside, so that no particles are introduced into the casting.
  • the feeder insert 1 is divided approximately in the middle, that is, the division 4 is at least partially along a center line M.
  • the upper part 5 is likewise designed to widen conically. This serves to increase the internal volume 7 of the feeder insert 1.
  • the lower part 6 of the feeder insert 1 has a constriction 11 ,
  • the constriction 11 is geometrically designed such that an optimal pressure distribution is ensured in the compression of the sand.
  • the mandrel 2 may be formed, for example, as a spring mandrel.
  • the feeder insert 1, in particular the upper part 5 has a curved outer contour 12.
  • the feeder insert 1 with the parts 5, 6 has a circumferential groove 13, in the form and frictionally engages a spring 14. This makes it possible to dispense with the use of adhesive for connecting the parts 5, 6 of the feeder insert 1, so that gases do not arise in the actual casting process.
  • Fig. 2 shows the feeder insert 1 with the parts 5, 6, which are connected by means of a dovetail guide 17.
  • the dovetail guide 17 is arranged in the lower part 6 and thus also in the upper part 5 (not shown) that the upper part 5 and the lower part 6 are formed against each other displaceable.
  • Fig. 4 shows the feeder insert 1 with an inner recess 30.
  • the recess 30 forms the predetermined breaking point 16 from.
  • the mandrel 2 abuts when the feeder insert 1 is lowered in the direction of arrow A during the molding process.
  • the predetermined breaking point 16 has a significantly reduced wall thickness through the recess 30. This makes it possible that the mandrel 2 (in Fig. 4 not shown) produces a consistent reproducing burst.
  • the feeder insert 1 is designed as not divided in the lower third feeder.
  • the feeder insert 1 has the constrictions 11.
  • Fig. 5 shows the feeder insert 1 with the upper part 5 and the lower part 6 and the predetermined breaking point 16, which is formed by the outer recess 29.
  • the mandrel 2 is formed with a recess 22, so that a centering pin 23 is formed at the end of the mandrel 2.
  • Fig. 6 is on the mandrel 2 another recess 24 is provided which forms a stop surface with which the feeder insert 1 comes to lie with surfaces 25 after lowering in the direction of arrow A to a controlled Lowering in the direction of arrow A to ensure.
  • the distance between the feeder sleeve 1 and the casting is adjustable by the combination of the special mandrel formation and the predetermined breaking point geometry. As a result, the distance between feeder insert 1 and casting can be adjusted to the requirements.
  • the feeder insert 1 has a predetermined breaking point 16, which is formed by the recess 30.
  • the mandrel 2 engages with its centering pin 23 through an opening 26 of the feeder sleeve 1.
  • the opening 26 is provided in the region of the recess 30 in the feeder sleeve before breaking with the mandrel 2.
  • the feeder insert 1 in the region of the recess 29 has an opening 26 into which the centering pin 23 of the mandrel 2 engages before piercing the predetermined breaking point 16.
  • Fig. 8 shows the feeder insert 1 with the predetermined breaking point 16, which in turn is formed by the recess 30, which is arranged inside the feeder insert 1. Between the upper part 5 and the lower part 6, an intermediate piece 20 is arranged in order to increase the inner volume 7 of the feeder insert 1.
  • the feeder insert 1 has a feeder cap 27 which covers the penetration area in the region of the predetermined breaking point 16, so that no sand gets into the interior 7 of the feeder insert 1 when the mandrel 2 is pierced by the predetermined breaking point 16.
  • Fig. 9 shows the feeder insert 1 with the predetermined breaking point 16.
  • the feeder insert 9 has an internal annular recess 32, which forms the predetermined breaking point 16.
  • an annular groove 28 for receiving an adhesive is arranged in the upper riser part 5.
  • Fig. 10 shows the feeder insert 1 with the predetermined breaking point 16, which is formed by an outer annular recess 33.
  • the outer contour 12 may be formed very different. It is essential that the pressure distribution on the feeder insert 1 in the compression molding is optimal.

Landscapes

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

Claims (11)

  1. Insert de masselottage destiné à être agencé dans un moule utilisé pour la coulée de métaux, formé par un corps de masselottage, qui comporte un volume de masselottage, réalisé dans un matériau exothermique et/ou isolant, dans lequel le corps de masselottage présente, en tant que volume de masselottage, un espace intérieur délimité par des parois latéraux et une zone supérieure et qui présente dans la zone de fond du corps de masselottage une ouverture de masselottage formant liaison avec l'espace creux du moule, dans lequel l'insert de masselottage présente dans sa partie supérieure une zone destinée à la rupture pour la pénétration d'une broche, et dans lequel la zone destinée à la rupture est formée par un évidement dans le corps de masselottage de sorte que le corps de masselottage présente, dans la région de l'évidement, une épaisseur de paroi réduite,
    caractérisé en ce que l'évidement (32, 33) est réalisé sous la forme d'au moins un évidement annulaire.
  2. Insert de masselottage selon la revendication 1, caractérisé en ce que l'épaisseur de paroi dans la région de l'évidement (29, 30, 32, 33) correspond à moins de 70 % de l'épaisseur de paroi totale.
  3. Insert de masselottage selon la revendication 2, caractérisé en ce que l'épaisseur de paroi dans la région de l'évidement (29, 30, 32, 33) correspond à moins de 50 % de l'épaisseur de paroi totale.
  4. Insert de masselottage selon l'une des revendications précédentes, caractérisé en ce que la zone destinée à la rupture (16) est réalisée de façon à être complètement recouverte d'un capuchon de masselottage (27).
  5. Insert de masselottage selon l'une des revendications précédentes, caractérisé en ce que l'évidement (29,33) est disposé extérieurement sur l'insert de masselottage.
  6. Insert de masselottage selon l'une des revendications précédentes, caractérisé en ce que l'évidement (30, 32) est disposé intérieurement sur l'insert de masselottage.
  7. Insert de masselottage selon la revendication 1, caractérisé en ce que l'insert de masselottage (1) est réalisé sans noyau de cassage et présente au moins une division (4).
  8. Insert de masselottage selon l'une des revendications précédentes, caractérisé en ce que, entre une partie supérieure (5), dans laquelle le au moins un évidement (32, 33) est agencé, et une partie inférieure (6) au moins une partie intermédiaire (20) est agencée.
  9. Insert de masselottage selon la revendication 8, caractérisé en ce que les parties intermiédiaires (20) sont réalisées de façon identique.
  10. Insert de masselottage selon l'une des revendications précédentes, caractérisé en ce que l'insert de masselottage (1) est formé intégralement d'un matériau uniforme.
  11. Insert de masselottage selon l'une des revendications précédentes, caractérisé en ce qu'au moins un filtre est agencé dans l'insert de masselottage.
EP06020665A 2005-10-14 2006-09-30 Insert pour masselotte pour une moule de coulage Active EP1775045B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005049734A DE102005049734A1 (de) 2005-10-14 2005-10-14 Speisereinsatz zur Anordnung in einer beim Gießen von Metallen verwendeten Gießform

Publications (3)

Publication Number Publication Date
EP1775045A2 EP1775045A2 (fr) 2007-04-18
EP1775045A3 EP1775045A3 (fr) 2008-09-10
EP1775045B1 true EP1775045B1 (fr) 2010-03-03

Family

ID=37667327

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06020665A Active EP1775045B1 (fr) 2005-10-14 2006-09-30 Insert pour masselotte pour une moule de coulage

Country Status (3)

Country Link
EP (1) EP1775045B1 (fr)
AT (1) ATE459441T1 (fr)
DE (2) DE102005049734A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2659996B1 (fr) 2012-04-30 2015-04-15 Foseco International Limited Masselotte
CN105531053A (zh) * 2013-07-02 2016-04-27 浇铸工艺产品有限责任公司 用于垂直分离的铸模的给料器插入件
GB201415516D0 (en) 2014-09-02 2014-10-15 Foseco Int Feeder system
DE102015101913B3 (de) * 2015-02-10 2016-05-12 Foseco International Limited Eingussspeiser mit integriertem losen Filter, Gusssystem bestehend aus dem Eingussspeiser und einem Formmodell und Verfahren zur Herstellung einer Gussform
EP3337631B1 (fr) 2015-09-02 2020-01-29 Foseco International Limited Système d'alimentation
US10286445B2 (en) 2015-09-02 2019-05-14 Foseco International Limited Feeder system
DE102021104435A1 (de) * 2021-02-24 2022-08-25 Chemex Foundry Solutions Gmbh Vertikal geteilter Speiser zur Verwendung beim Gießen von Metallen in Gießformen sowie Verfahren zu dessen Herstellung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4858673A (en) * 1987-10-22 1989-08-22 Caldo Internationa, Inc. Riser construction
DE4200183A1 (de) * 1991-01-14 1992-07-16 Erich Kuehn Zweigeteilter speiser
DE19503456C1 (de) * 1995-02-03 1995-11-02 Daimler Benz Ag Anordnung aus einem topfförmigen Speiser und einem diesen mit Abstand auf einem Gießmodell lagernden Dorn
DE10039519B4 (de) * 2000-08-08 2007-05-31 Chemex Gmbh Speisereinsatz
DE202004009367U1 (de) * 2004-06-15 2004-08-19 GTP Schäfer Gießtechnische Produkte GmbH Speiser mit verformbaren Metallfuß
DE202005001318U1 (de) * 2005-01-26 2005-05-12 GTP Schäfer Gießtechnische Produkte GmbH Aufform-Filterspeiser
DE102005025701B4 (de) * 2005-06-04 2007-03-08 GTP Schäfer Gießtechnische Produkte GmbH Speiser mit nachgiebigem Speiserunterteil

Also Published As

Publication number Publication date
DE102005049734A1 (de) 2007-04-26
DE502006006320D1 (de) 2010-04-15
ATE459441T1 (de) 2010-03-15
EP1775045A2 (fr) 2007-04-18
EP1775045A3 (fr) 2008-09-10

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