EP0224406B1 - Vibrating table, particularly used in a foundry - Google Patents

Vibrating table, particularly used in a foundry Download PDF

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Publication number
EP0224406B1
EP0224406B1 EP86402388A EP86402388A EP0224406B1 EP 0224406 B1 EP0224406 B1 EP 0224406B1 EP 86402388 A EP86402388 A EP 86402388A EP 86402388 A EP86402388 A EP 86402388A EP 0224406 B1 EP0224406 B1 EP 0224406B1
Authority
EP
European Patent Office
Prior art keywords
vibrating table
vibrators
plate
central axis
unbalance
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.)
Expired
Application number
EP86402388A
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German (de)
French (fr)
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EP0224406A1 (en
Inventor
Jean-Jacques Hanneton
Michel Sivori
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.)
Regie Nationale des Usines Renault
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Regie Nationale des Usines Renault
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Publication date
Application filed by Regie Nationale des Usines Renault filed Critical Regie Nationale des Usines Renault
Publication of EP0224406A1 publication Critical patent/EP0224406A1/en
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Publication of EP0224406B1 publication Critical patent/EP0224406B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/10—Compacting by jarring devices only

Definitions

  • the present invention relates to a vibrating table used in particular in foundries for obtaining rigid moldings by compacting sand (FR-A-967437).
  • the object of the invention is to avoid such risks by appropriate use of vibrations, while ensuring proper and simultaneous operations of filling and compacting the sand.
  • a vibrating table of the type comprising vibrators fixed to a frame, and a horizontal plate secured to this frame and isolated from the base thereof by shock absorbers.
  • this vibrating table includes two vibrators whose unbalance axes are arranged parallel to the vertical reference plane of the plate, which passes through the central axis thereof, and symmetrically to this central axis.
  • the offset of these unbalance axes relative to this vertical reference plane is used as an adjustment parameter for the clamping (rigidity of the mold) and the distribution (filling) of the sand, without any deformation of the model.
  • this vibrating table comprises two vibrators 1, 2 solidly fixed on a rigid frame 3.
  • a horizontal plate 4 integral with this frame is designed to receive a mold to be produced 5.
  • This plate is isolated from the frame 3 by shock absorbers 6 sufficiently dimensioned.
  • the vibrators 1, 2 are strictly situated at the same level defined by a horizontal plane H. They respectively have unbalance axes B, B '(FIG. 2) arranged parallel to the vertical reference plane P of the plate 4 which passes through the central axis X thereof, on the one hand, and symmetrically to this central axis, on the other hand.
  • the offset D of the unbalance axes of rotation becomes an adjustment parameter for clamping and distributing the sand, which is defined as a function of the part to be molded, as is the direction of rotation of the vibrators 1, 2.
  • the power of the corresponding motors is related to the load to be vibrated.
  • the support plate 4 of the mold 5 is equipped with a clamping device, not shown, the characteristics of which depend on the shape and dimensions of this mold.
  • the shock absorbers 6 can be mechanical (springs) or pneumatic (tires).
  • FIG. 1 In FIG. 1 are shown the centrifugal forces F which are exerted on the respective vibrators 1,2 rotating in opposite directions with an average offset D.
  • centrifugal forces F are located in the vertical planes passing through the unbalance axes B, B ', parallel to the plane P.
  • the vertical components F "add up and determine a vertical vibratory amplitude.
  • Each horizontal component F ' is broken down into two other components F 1 and F2 by projection onto the vertical plane V passing through the central axis X and the unbalance centers C, C' ( Figure 2).
  • the two components F 1 not contained in this plane V form a horizontal couple.
  • the vibrating table previously described thus makes it possible to adapt the vibration to the type of part to be produced, by varying only the offset D of the vibrators 1, 2.

Description

La présente invention se rapporte à une table vibrante utilisée notamment en fonderie pour l'obtention de moulages rigides par compactage de sable (FR-A-967437).The present invention relates to a vibrating table used in particular in foundries for obtaining rigid moldings by compacting sand (FR-A-967437).

Elle s'applique tout particulièrement aux procédés de moulage dont les modèles perdus en polystyrène expansé sont emballés dans un sable siliceux unique.It is particularly applicable to molding processes in which the lost models of expanded polystyrene are packed in a single silica sand.

Pour réaliser les moules correspondants, une bonne répartition du sable autour et dans les in- tersticesde ces modèles ainsi qu'un bon serrage du sable s'avèrent indispensables.To make the corresponding molds, a good distribution of the sand around and in the gaps of these models as well as a good tightening of the sand are essential.

Les modèles, qui sont très fragiles, ne doivent subir aucune déformation et encore moins être détériorés.The models, which are very fragile, must not undergo any deformation and even less be deteriorated.

L'invention a pour but d'éviter de tels risques par une utilisation appropriée de vibrations, tout en assurant de façon convenable et simultanée les opérations de remplissage et de compactage du sable.The object of the invention is to avoid such risks by appropriate use of vibrations, while ensuring proper and simultaneous operations of filling and compacting the sand.

A cet effet, elle a pour objet une table vibrante du type comprenant des vibrateurs fixés sur un bâti, et un plateau horizontal solidaire de ce bâti et isolé de la base de celui-ci par des amortisseurs.To this end, it relates to a vibrating table of the type comprising vibrators fixed to a frame, and a horizontal plate secured to this frame and isolated from the base thereof by shock absorbers.

Suivant une particularité essentielle, cette table vibrante comporte deux vibrateurs dont les axes de balourd sont disposés parallèlement au plan vertical de référence du plateau, qui passe par l'axe central de celui-ci, et symétriquement à cet axe central.According to an essential feature, this vibrating table includes two vibrators whose unbalance axes are arranged parallel to the vertical reference plane of the plate, which passes through the central axis thereof, and symmetrically to this central axis.

Suivant une autre particularité de l'invention, le décalage de ces axes de balourd par rapport à ce plan vertical de référence est utilisé comme paramètre de réglage pour le serrage (rigidité du moule) et la répartition (remplissage) du sable, sans aucune déformation du modèle.According to another feature of the invention, the offset of these unbalance axes relative to this vertical reference plane is used as an adjustment parameter for the clamping (rigidity of the mold) and the distribution (filling) of the sand, without any deformation of the model.

Ces particularités montrent qu'il est possible d'obtenir, par un fonctionnement simultané de ces deux vibrateurs, une vibration bidirectionnelle, spécialement bien adaptée à la distribution et au serrage du sable.These characteristics show that it is possible to obtain, by a simultaneous operation of these two vibrators, a bidirectional vibration, specially well suited to the distribution and clamping of the sand.

D'autres particularités et avantages de l'invention apparaîtront plus clairement à la lecture de la description qui suit, d'un mode de réalisation préféré, donné à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels:

  • - la figure 1 représente une vue schématique en élévation d'une table vibrante conforme à l'invention, et
  • - la figure 2 représente une vue schématique en plan de cette table vibrante.
Other features and advantages of the invention will appear more clearly on reading the description which follows, of a preferred embodiment, given by way of nonlimiting example, with reference to the appended drawings in which:
  • FIG. 1 represents a schematic elevation view of a vibrating table according to the invention, and
  • - Figure 2 shows a schematic plan view of this vibrating table.

Conformément aux figures 1 et 2, cette table vibrante comprend deux vibrateurs 1, 2 solidement fixés sur un bâti rigide 3. Un tel plateau horizontal 4, solidaire de ce bâti, est conçu pour recevoir un moule à réaliser 5.In accordance with FIGS. 1 and 2, this vibrating table comprises two vibrators 1, 2 solidly fixed on a rigid frame 3. Such a horizontal plate 4, integral with this frame, is designed to receive a mold to be produced 5.

Ce plateau est isolé du bâti 3 par des amortisseurs 6 suffisamment dimensionnés.This plate is isolated from the frame 3 by shock absorbers 6 sufficiently dimensioned.

Comme le montre la figure 1, les vibrateurs 1, 2 sont rigoureusement situés à un même niveau défini par un plan horizontal H. Ils présentent respectivement des axes de balourd B, B' (figure 2) disposés parallèlement au plan vertical de référence P du plateau 4 qui passe par l'axe central X de celui-ci, d'une part, et symétriquement à cet axe central, d'autre part.As shown in FIG. 1, the vibrators 1, 2 are strictly situated at the same level defined by a horizontal plane H. They respectively have unbalance axes B, B '(FIG. 2) arranged parallel to the vertical reference plane P of the plate 4 which passes through the central axis X thereof, on the one hand, and symmetrically to this central axis, on the other hand.

Le décalage D des axes de rotation des balourds devient un paramètre de réglage pour le serrage et la répartition du sable, qui est défini en fonction de la pièce à mouler, tout comme le sens de rotation des vibrateurs 1, 2.The offset D of the unbalance axes of rotation becomes an adjustment parameter for clamping and distributing the sand, which is defined as a function of the part to be molded, as is the direction of rotation of the vibrators 1, 2.

Les possibilités de réglage du système sont nombreuses avec des vibrateurs électriques et un variateur de fréquence.There are many possibilities for adjusting the system with electric vibrators and a frequency converter.

La puissance des moteurs correspondants est en rapport avec la charge à vibrer.The power of the corresponding motors is related to the load to be vibrated.

Le plateau-support 4 du moule 5 est équipé d'un dispositif de bridage non représenté dont les caractéristiques dépendent de la forme et des dimensions de ce moule.The support plate 4 of the mold 5 is equipped with a clamping device, not shown, the characteristics of which depend on the shape and dimensions of this mold.

Les amortisseurs 6 peuvent être mécaniques (ressorts) ou pneumatiques (pneus).The shock absorbers 6 can be mechanical (springs) or pneumatic (tires).

Sur la figure 1 sont représentées les forces centrifuges F qui s'exercent sur les vibrateurs respectifs 1,2 tournant suivant des sens opposés avec un n décalage moyen D.In FIG. 1 are shown the centrifugal forces F which are exerted on the respective vibrators 1,2 rotating in opposite directions with an average offset D.

Ces forces centrifuges F sont situées dans les plans verticaux passant par les axes de balourd B, B', parallèles au plan P.These centrifugal forces F are located in the vertical planes passing through the unbalance axes B, B ', parallel to the plane P.

EHes se décomposent en une composante horizontale F' et une composante verticale F".EHes break down into a horizontal component F 'and a vertical component F ".

Comme les vibrateurs fonctionnent en synchronisme, les composantes verticales F" s'addition- nenent et déterminent une amplitude verticale vibratoire.As the vibrators operate in synchronism, the vertical components F "add up and determine a vertical vibratory amplitude.

Chaque composante horizontale F' se décompose en deux autres composantes F1 et F2 par projection sur le plan vertical V passant par l'axe central X et les centres de balourd C, C' (figure 2). Les deux composantes F1 non contenues dans ce plan V forment un couple horizontal.Each horizontal component F 'is broken down into two other components F 1 and F2 by projection onto the vertical plane V passing through the central axis X and the unbalance centers C, C' (Figure 2). The two components F 1 not contained in this plane V form a horizontal couple.

Cette décomposition de forces s'exerçant sur cette table vibrante suppose les conditions matérielles suivantes:

  • - les deux vibrateurs 1, 2 sont solidaires d'un même support;
  • - le plateau 4 est rigidifié par des renforts pour éviter toute déformation de la vibration;
  • - le plateau 4 est isolé du bâti 3 (charpente) par des amortisseurs.
This decomposition of forces exerted on this vibrating table supposes the following material conditions:
  • - The two vibrators 1, 2 are integral with the same support;
  • - The plate 4 is stiffened by reinforcements to avoid any deformation of the vibration;
  • - The plate 4 is isolated from the frame 3 (frame) by shock absorbers.

La table vibrante précédemment décrite permet ainsi d'adapter la vibration au type de pièce à produire, en faisant varier uniquement le décalage D des vibrateurs 1, 2.The vibrating table previously described thus makes it possible to adapt the vibration to the type of part to be produced, by varying only the offset D of the vibrators 1, 2.

Claims (2)

1. A vibrating table which is used in particular in casting, of the type comprising vibrators which are fixed on a support structure (3) and a horizontal plate (4) which is fixed with respect to the support structure and insulated from the base thereof by dampers (6), characterised in that it comprises two vibrators (1, 2) whose axes of unbalance (B, B') are disposed parallel to the vertical reference plane (P) of the plate (4) which passes through the central axis (X) thereof on the one hand and symme- tricallywith respect to said central axis on the other hand.
2. A vibrating table according to claim 1, characterised in that the displacement (D) of the axes of unbalance (B, B') with respectto said vertical reference plane (P) of the plate is used as a regulating parameter in regard to a compacting effect and the distribution in respect of the sand without any deformation of the pattern.
EP86402388A 1985-10-29 1986-10-24 Vibrating table, particularly used in a foundry Expired EP0224406B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8516028A FR2589093B1 (en) 1985-10-29 1985-10-29 VIBRATING TABLE USED IN PARTICULAR IN FOUNDRY
FR8516028 1985-10-29

Publications (2)

Publication Number Publication Date
EP0224406A1 EP0224406A1 (en) 1987-06-03
EP0224406B1 true EP0224406B1 (en) 1988-06-01

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EP86402388A Expired EP0224406B1 (en) 1985-10-29 1986-10-24 Vibrating table, particularly used in a foundry

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US (1) US4796685A (en)
EP (1) EP0224406B1 (en)
DE (1) DE3660234D1 (en)
FR (1) FR2589093B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5067549A (en) * 1989-12-04 1991-11-26 General Kinematics Corporation Compaction apparatus and process for compacting sand
US5606231A (en) * 1993-12-04 1997-02-25 Netter Gmbh Vibrating table for masses to be compacted and a vibratory method of compaction for the compaction of concrete
US6105433A (en) * 1999-03-02 2000-08-22 Qualmark Corporation Shaker table assembly for a reliability test chamber utilizing different types of vibrator assemblies
US6112596A (en) * 1999-03-02 2000-09-05 Qualmark Corporation Shaker table assembly for a test chamber
EP1741068B1 (en) * 2004-04-20 2009-05-20 Rampf Formen GmbH Device for monitoring and controlling or regulating a machine
CN102717034B (en) * 2012-04-27 2014-10-29 安徽中兴华汉机械有限公司 Vibration compaction bench

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR967437A (en) * 1948-06-08 1950-11-03 Vibro Betong Ab Vibrator device to obtain a vibratory effect directed by means of rotating vibrating organs
US3274660A (en) * 1960-10-17 1966-09-27 Builders Equip Co Slump block producing machine
FR1291621A (en) * 1961-03-14 1962-04-27 Dalaudiere Ets Improvements to vibrating devices
US3767168A (en) * 1970-05-18 1973-10-23 Nat Foundry Equipment Co Inc Mechanical agitation apparatus
CA1177221A (en) * 1980-12-04 1984-11-06 General Kinematics Corporation Vibratory method for packing foundry sand into a pattern prior to the pouring of molten metal
US4340469A (en) * 1981-01-23 1982-07-20 Spokane Crusher Mfg. Co. Vibratory screen apparatus

Also Published As

Publication number Publication date
EP0224406A1 (en) 1987-06-03
FR2589093A1 (en) 1987-04-30
FR2589093B1 (en) 1987-12-11
US4796685A (en) 1989-01-10
DE3660234D1 (en) 1988-07-07

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