EP0611275B1 - Process and apparatus for separating small workpieces - Google Patents

Process and apparatus for separating small workpieces Download PDF

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Publication number
EP0611275B1
EP0611275B1 EP19940890016 EP94890016A EP0611275B1 EP 0611275 B1 EP0611275 B1 EP 0611275B1 EP 19940890016 EP19940890016 EP 19940890016 EP 94890016 A EP94890016 A EP 94890016A EP 0611275 B1 EP0611275 B1 EP 0611275B1
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EP
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Prior art keywords
container
mixture
workpieces
liquid
pump
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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 - Lifetime
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EP19940890016
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German (de)
French (fr)
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EP0611275A1 (en
Inventor
Wolfram Dipl.-Ing. Schaupp
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.)
Johann Tauss GmbH
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Johann Tauss GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
    • B24B31/16—Means for separating the workpiece from the abrasive medium at the end of operation

Definitions

  • the invention relates to a method for separating small workpieces from a workpiece-abrasive mixture, wherein the workpiece-abrasive mixture is introduced into a liquid and the separation is carried out after the body has risen and descended in the liquid.
  • the invention further relates to a device for carrying out such a method.
  • Such devices can e.g. be designed as centrifugal force devices or as vibration devices.
  • the two mixture parts can be separated after machining the workpieces using a vibrating sieve through which the grinding bodies fall and in which the workpieces are retained.
  • this method cannot be used for grinding bodies and workpieces that are not very different in size. It has to be sorted out manually in a very time-consuming manner.
  • EP-A1-301 608 proposes a method of the type mentioned in the introduction in which the grinding wheels and workpieces are separated statically, which takes a very long time.
  • the invention has set itself the goal of creating a method by means of which even small workpieces which correspond in size to the grinding wheels can be quickly and safely sorted out from a grinding wheel / workpiece mixture. This is achieved in that the workpiece-abrasive mixture in a container is exposed to an upward liquid flow, in particular water flow, the absolute flow rate of which between the sinking speed of the workpieces and the sinking speed of the grinding wheels is and the heavier mixture parts, in particular workpieces, are collected at the bottom of the container, the lighter mixture parts, especially the grinding wheels, are pulled off at the top.
  • a device which is characterized according to the invention in that a sieve basket having a closed bottom is inserted into a container which is provided in the bottom with a feed line from a pump and into which a nozzle which opens a feed opening for the workpiece-abrasive mixture is provided.
  • a sieve basket having a closed bottom is inserted into a container which is provided in the bottom with a feed line from a pump and into which a nozzle which opens a feed opening for the workpiece-abrasive mixture is provided.
  • the container is surrounded by a collar in the form of a drainage channel which directs the liquid mixed with grinding media to a collecting container.
  • the collecting container is designed as a strainer basket and is arranged in a housing which also accommodates the pump and the container.
  • the pump is expediently designed to be controllable.
  • the controllability can e.g. can be achieved by speed control or volume control via cover slides. This enables a change in the flow rate of the liquid and thus an adaptation to the sinking speeds of the workpieces and the grinding wheels.
  • FIG. 1 schematically shows in section a device according to the invention and FIG. 2 shows the diagram of the different speeds.
  • a container 2, a pump 3 and a collecting container 4 designed as a strainer basket are arranged in a housing 1.
  • the housing 1 is after open at the top and filled with liquid, especially water, up to the indicated height.
  • the container 2 is connected at its bottom to the pressure line 5 of the pump 3, the suction takes place via a suction line 6.
  • a sieve basket 7 is inserted into the container 2, which is expediently provided with a closed bottom 8.
  • a nozzle 9 dips somewhat into the strainer basket 7, an annular space remaining free between the nozzle wall and the strainer basket.
  • the container 2 is closed except for the opening for the nozzle 9.
  • An inclined drainage channel 10 leading to the collecting container 4 surrounds the container 2 in a collar shape.
  • the liquid conveyed by the pump 3 flows upward essentially to the side of the strainer basket 7 and enters the latter through the annular space between the container 7 and the nozzle 9.
  • the narrowing of the nozzle 9 is flowed through at a speed which is uniformly distributed over the entire cross section.
  • a workpiece and abrasive mixture applied from above has a tendency to sink downwards. Due to the different sinking speed between the workpiece parts on the one hand and the grinding wheel parts on the other hand, however, only the workpieces will sink downwards, whereas the grinding wheel will be carried upwards by the liquid. There they flood the upper end of the nozzle together with the liquid and are passed via the drainage channel 10 into the collecting container 4.
  • the grinding wheels can easily be removed from the collecting container 4 and the workpieces from the sieve basket 7.
  • the screen basket 7 can be pulled out of the container 2 for this purpose.
  • the device according to the invention can be varied in many ways. For example, At the beginning of the nozzle 9 guide vanes 11 are arranged to even out the flow rate of the liquid.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Centrifugal Separators (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Absondern von kleinen Werkstücken aus einem Werkstück-Schleifkörpergemisch, wobei das Werkstück-Schleifkörpergemisch in eine Flüssigkeit eingebracht und die Trennung nach dem Aufsteigen und Absinken der Körper in der Flüssigkeit vorgenommen wird. Ferner ist Gegenstand der Erfindung eine Vorrichtung zur Durchführung eines solchen Verfahrens.The invention relates to a method for separating small workpieces from a workpiece-abrasive mixture, wherein the workpiece-abrasive mixture is introduced into a liquid and the separation is carried out after the body has risen and descended in the liquid. The invention further relates to a device for carrying out such a method.

Zur Oberflächenbehandlung von kleinen Werkstücken, z.B. Brillenteilen, werden Verfahren bzw. Vorrichtungen angewendet, bei denen die Werkstücke zusammen mit Schleifkörpern in eine gemeinsame Bewegung versetzt werden, bei der durch das Aneinanderreiben der beiden Gemischteile die Werkstücke zwangsläufig einer Oberflächenbehandlung unterzogen werden. Derartige, auch als Gleitschleif-oder Polieranlagen bezeichnete Vorrichtungen können z.B. als Fliehkraftgeräte oder als Vibrationsgeräte ausgebildet sein.For surface treatment of small workpieces, e.g. Glasses parts, methods or devices are used in which the workpieces are put into a common movement together with grinding wheels, in which the workpieces are inevitably subjected to a surface treatment by rubbing the two mixture parts against one another. Such devices, also referred to as vibratory grinding or polishing systems, can e.g. be designed as centrifugal force devices or as vibration devices.

Bei verschiedener Größe von Schleifkörpern und Werkstücken kann die Separierung der beiden Gemischteile nach der Bearbeitung der Werkstücke über ein Vibrationssieb erfolgen, durch das die Schleifkörper fallen und in dem die Werkstücke zurückgehalten werden. Die Anwendung dieses Verfahrens ist jedoch bei größenmäßig nicht sehr verschiedenen Schleifkörpern und Werkstücken nicht möglich. Es muß hier auf sehr zeitraubende Weise händisch aussortiert werden.In the case of different sizes of grinding bodies and workpieces, the two mixture parts can be separated after machining the workpieces using a vibrating sieve through which the grinding bodies fall and in which the workpieces are retained. However, this method cannot be used for grinding bodies and workpieces that are not very different in size. It has to be sorted out manually in a very time-consuming manner.

In der EP-A1-301 608 wird ein Verfahren der eingangs genannten Art vorgeschlagen, bei dem das Trennen von Schleifkörpern und Werkstücken statisch erfolgt, was sehr viel Zeit erfordert.EP-A1-301 608 proposes a method of the type mentioned in the introduction in which the grinding wheels and workpieces are separated statically, which takes a very long time.

Die Erfindung hat es sich zum Ziel gesetzt, ein Verfahren zu schaffen, durch das auch kleine Werkstücke, die größenmäßig den Schleifkörpern entsprechen, aus einem Schleifkörper-Werkstückgemisch rasch und sicher aussortiert werden können. Erreicht wird dies dadurch, daß das Werkstück-Schleifkörpergemisch in einem Behälter einem nach oben gerichteten Flüssigkeitsstrom, insbesondere Wasserstrom, ausgesetzt wird, dessen absolute Strömungsgeschwindigkeit zwischen der Sinkgeschwindigkeit der Werkstücke und der Sinkgeschwindigkeit der Schleifkörper liegt und die schwereren Mischungsteile, insbesondere Werkstücke, am Boden des Behälters gesammelt, die leichteren Mischungsteile, insbesondere die Schleifkörper, oben abgezogen werden.The invention has set itself the goal of creating a method by means of which even small workpieces which correspond in size to the grinding wheels can be quickly and safely sorted out from a grinding wheel / workpiece mixture. This is achieved in that the workpiece-abrasive mixture in a container is exposed to an upward liquid flow, in particular water flow, the absolute flow rate of which between the sinking speed of the workpieces and the sinking speed of the grinding wheels is and the heavier mixture parts, in particular workpieces, are collected at the bottom of the container, the lighter mixture parts, especially the grinding wheels, are pulled off at the top.

Bei praktischen Versuchen hat sich gezeigt, daß durch ein solches Verfahren eine einfache, äußerst sichere und insbesondere auch rasche Separierung der beiden Mischungsteile erreichbar ist.Practical tests have shown that a simple, extremely safe and, in particular, rapid separation of the two mixture parts can be achieved by such a method.

Im Rahmen der Erfindung ist es auch möglich, das Wasser mit die Viskosität oder die Dichte erhöhenden Zusätzen zu versehen.In the context of the invention it is also possible to provide the water with additives which increase the viscosity or density.

Bei den durchgeführten Versuchen wurde eine Vorrichtung angewandt, die sich erfindungsgemäß dadurch auszeichnet, daß in einen Behälter, der im Boden mit einer Zuleitung von einer Pumpe versehen ist, ein, einen geschlossenen Boden aufweisender Siebkorb eingesetzt ist, in den eine Düse mündet, die mit einer Zuführungsöffnung für das Werkstück-Schleifkörpergemisch versehen ist. Die Werkstücke haben sich bei einer solchen Vorrichtung im Siebkorb abgesetzt, die Schleifkörper sind oberhalb der Düse zusammen mit der Flüssigkeit ausgetreten.In the experiments carried out, a device was used which is characterized according to the invention in that a sieve basket having a closed bottom is inserted into a container which is provided in the bottom with a feed line from a pump and into which a nozzle which opens a feed opening for the workpiece-abrasive mixture is provided. With such a device, the workpieces have settled in the sieve basket, the grinding bodies have emerged together with the liquid above the nozzle.

Zur Abfuhr der mit Schleilkörpern vermischten Flüssigkeit ist der Behälter kragenförmig von einer Ablaufrinne umgeben, die die mit Schleifkörpern vermischte Flüssigkeit zu einem Sammelbehälter leitet.To remove the liquid mixed with grinding media, the container is surrounded by a collar in the form of a drainage channel which directs the liquid mixed with grinding media to a collecting container.

Um eine kompakte Einheit der Vorrichtung zu erreichen, ist der Sammelbehälter als Siebkorb ausgebildet und in einem auch die Pumpe und den Behälter aufnehmenden Gehäuse angeordnet.In order to achieve a compact unit of the device, the collecting container is designed as a strainer basket and is arranged in a housing which also accommodates the pump and the container.

Um eine erfindungsgemässe Vorrichtung an verschiedenartige Werkstücke und Schleifkörper auf einfache Weise anpassen zu können, ist zweckmäßig die Pumpe regelbar ausgebildet. Die Regelbarkeit kann dabei z.B. durch eine Drehzahlregelung oder eine Mengenregelung über Abdeckschieber erreicht werden. Es wird dadurch eine Veränderung der Strömungsgeschwindigkeit der Flüssigkeit und somit eine Anpassung an die Sinkgeschwindigkeiten der Werkstücke und der Schleifkörper ermöglicht.In order to be able to adapt a device according to the invention to different types of workpieces and grinding wheels in a simple manner, the pump is expediently designed to be controllable. The controllability can e.g. can be achieved by speed control or volume control via cover slides. This enables a change in the flow rate of the liquid and thus an adaptation to the sinking speeds of the workpieces and the grinding wheels.

Nachstehend ist die Erfindung anhand eines in den Zeichnungen dargestellten Ausführungsbeispieles näher beschrieben, ohne jedoch auf dieses Ausführungsbeispiel beschränkt zu sein. Dabei zeigt Fig. 1 schematisch im Schnitt eine erfindungsgemässe Vorrichtung und Fig. 2 stellt das Diagramm der verschiedenen Geschwindigkeiten dar.The invention is described in more detail below with reference to an embodiment shown in the drawings, but without being limited to this embodiment. 1 schematically shows in section a device according to the invention and FIG. 2 shows the diagram of the different speeds.

Gemäß Fig. 1 ist in einem Gehäuse 1 ein Behälter 2, eine Pumpe 3 und ein als Siebkorb ausgebildeter Sammelbehälter 4 angeordnet. Das Gehäuse 1 ist nach oben hin offen und mit Flüssigkeit, insbesondere Wasser, bis zur angezeigten Höhe gefüllt. Der Behälter 2 ist an seinem Boden mit der Druckleitung 5 der Pumpe 3 verbunden, das Ansaugen erfolgt über eine Saugleitung 6.1, a container 2, a pump 3 and a collecting container 4 designed as a strainer basket are arranged in a housing 1. The housing 1 is after open at the top and filled with liquid, especially water, up to the indicated height. The container 2 is connected at its bottom to the pressure line 5 of the pump 3, the suction takes place via a suction line 6.

In den Behälter 2 ist ein Siebkorb 7 eingesetzt, der zweckmässig mit einem geschlossenen Boden 8 versehen ist. Eine Düse 9 taucht etwas in den Siebkorb 7 ein, wobei zwischen der Düsenwandung und dem Siebkorb ein Ringraum freibleibt. An seinem oberen Ende ist der Behälter 2 bis auf den Durchbruch für die Düse 9 geschlossen. Eine zum Sammelbehälter 4 führende schräge Ablaufrinne 10 umgibt kragenförmig den Behälter 2.A sieve basket 7 is inserted into the container 2, which is expediently provided with a closed bottom 8. A nozzle 9 dips somewhat into the strainer basket 7, an annular space remaining free between the nozzle wall and the strainer basket. At its upper end, the container 2 is closed except for the opening for the nozzle 9. An inclined drainage channel 10 leading to the collecting container 4 surrounds the container 2 in a collar shape.

Im Betrieb strömt die von der Pumpe 3 geförderte Flüssigkeit im wesentlichen seitlich des Siebkorbes 7 nach oben und tritt durch den Ringraum zwischen dem Behälter 7 und der Düse 9 in letztere ein. Insbesondere die Verengung der Düse 9 wird mit einer über den gesamten Querschnitt gleichmässig verteilten Geschwindigkeit durchströmt.In operation, the liquid conveyed by the pump 3 flows upward essentially to the side of the strainer basket 7 and enters the latter through the annular space between the container 7 and the nozzle 9. In particular, the narrowing of the nozzle 9 is flowed through at a speed which is uniformly distributed over the entire cross section.

Ein von oben aufgegebenes Werkstück-Schleifkörpergemisch hat die Tendenz, nach unten zu sinken. Zufolge der verschiedenen Sinkgeschwindigkeit zwischen den Werkstückteilen einerseits und den Schleifkörperteilen andererseits werden jedoch nur die Werkstücke nach unten sinken, wogegen die Schleifkörper durch die Flüssigkeit nach oben mitgenommen werden. Dort überfluten sie zusammen mit der Flüssigkeit das obere Ende der Düse und werden über die Ablaufrinne 10 in den Sammelbehälter 4 geleitet.A workpiece and abrasive mixture applied from above has a tendency to sink downwards. Due to the different sinking speed between the workpiece parts on the one hand and the grinding wheel parts on the other hand, however, only the workpieces will sink downwards, whereas the grinding wheel will be carried upwards by the liquid. There they flood the upper end of the nozzle together with the liquid and are passed via the drainage channel 10 into the collecting container 4.

Nach dem Ende des Separationsvorganges können die Schleifkörper aus dem Sammelbehälter 4 und die Werkstücke aus dem Siebkorb 7 einfach entnommen werden. Selbstverständlich kann zu diesem Zweck der Siebkorb 7 aus dem Behälter 2 ausgezogen werden.At the end of the separation process, the grinding wheels can easily be removed from the collecting container 4 and the workpieces from the sieve basket 7. Of course, the screen basket 7 can be pulled out of the container 2 for this purpose.

In Fig. 2 sind die Geschwindigkeitsverhältnisse dargestellt, wobei auf der Abszisse die Geschwindigkeit der Flüssigkeit vf, die Sinkgeschwindigkeit der Schleifkörper vs und die Sinkgeschwindigkeit der Werkstücke vw aufgetragen ist. Es ist ersichtlich, daß sich durch geometrische Addition eine resultierende Steiggeschwindigkeit vsr der Schleifkörper und eine resultierende Sinkgeschwindigkeit vwr der Werkstücke ergibt.2 shows the speed ratios, the speed of the liquid v f, the sinking speed of the grinding wheels v s and the sinking speed of the workpieces v w being plotted on the abscissa. It can be seen that a geometrical addition results in a resulting rate of climb v sr of the grinding wheels and a resulting rate of descent v wr of the workpieces.

Im Rahmen der Erfindung sind zahlreiche Abänderungen möglich. Insbesondere kann die erfindungsgemäße Vorrichtung mannigfach verändert werden. So können z.B. am Beginn der Düse 9 Leitschaufeln 11 zur Vergleichmäßigung der Strömungsgeschwindigkeit der Flüssigkeit angeordnet werden.Numerous modifications are possible within the scope of the invention. In particular, the device according to the invention can be varied in many ways. For example, At the beginning of the nozzle 9 guide vanes 11 are arranged to even out the flow rate of the liquid.

Claims (5)

  1. Method of separating small workpieces out of a workpiece abrasive mix, the mix being introduced into a fluid and the process of separation being carried out according to how the bodies rise and fall in the liquid,
    characterised in that
    the workpiece abrasive mix is exposed in a container to a flow of liquid, especially water, directed upwards, the absolute velocity of the flow of this liquid lying between the settling speed of one part of the mixture and the settling speed of the other part of the mixture, and the heavier parts of the mixture, especially workpieces, are collected on the base of the container whilst the lighter parts of the mixture, especially the abrasive bodies, are drawn upwards.
  2. Method according to claim 1,
    characterised in that
    the water is provided with additives which increase the viscosity or the density.
  3. Device with a container (2),
    characterised in that
    to carry out the process according to claim 1 or 2, there is inserted into the container (2), which is provided in its base with an inlet pipe (5) from a pump (3), a strainer basket which has a closed base and into which a nozzle (9) discharges, which nozzle is provided with a feed aperture for the workpiece abrasive mix, and that the container (2) has an outlet channel (10) going round it like a collar, which channel takes the fluid mixed with the abrasive bodies to a collecting vessel (4).
  4. Device according to claim 3,
    characterised in that
    the collecting vessel (4) is designed as a strainer basket and is arranged in a housing (1) which also contains the pump (3) and the container (2).
  5. Device according to claim 3 or 4,
    characterised in that
    the pump (3) is designed to be adjustable.
EP19940890016 1993-02-12 1994-01-20 Process and apparatus for separating small workpieces Expired - Lifetime EP0611275B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT26593A AT399105B (en) 1993-02-12 1993-02-12 METHOD AND DEVICE FOR SEPARATING SMALL WORKPIECES
AT265/93 1993-02-12

Publications (2)

Publication Number Publication Date
EP0611275A1 EP0611275A1 (en) 1994-08-17
EP0611275B1 true EP0611275B1 (en) 1996-12-04

Family

ID=3485943

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Application Number Title Priority Date Filing Date
EP19940890016 Expired - Lifetime EP0611275B1 (en) 1993-02-12 1994-01-20 Process and apparatus for separating small workpieces

Country Status (3)

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EP (1) EP0611275B1 (en)
AT (1) AT399105B (en)
DE (1) DE59401174D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2819738B1 (en) * 2001-01-25 2003-04-11 Creafusion SORTING DEVICE FOR A MIXTURE OF METAL PARTS AND ABRASIVE PARTICLES

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR955610A (en) * 1950-01-18
DE431051C (en) * 1924-11-29 1926-06-26 Chauny & Cirey Mechanical maintenance of the tightness of flowing mixtures of a liquid with a grainy material, e.g. B. Grinding Fluid
GB2073617B (en) * 1980-04-15 1983-05-11 Shaw A Classification method and apparatus
DE3210972C2 (en) * 1982-03-25 1986-08-07 Alu Plast Aluminium-Plastik Recycling GmbH, 5440 Mayen Sink separator for plastic mixtures
DE3339026A1 (en) * 1983-10-27 1985-05-09 Schönert, Klaus, Prof. Dr.-Ing., 3392 Clausthal-Zellerfeld Jigging process for the separation of a fine-grained mixture according to the particle density
DE3517931A1 (en) * 1985-05-18 1986-11-20 Schauenburg Maschinen- und Anlagen-Bau GmbH, 4330 Mülheim Use of a fluidized-bed pulp sorter as a sorting apparatus in the treatment of flotation tailings
DE3615616C2 (en) * 1986-05-09 1995-04-13 Manfred Hefft Process for fractionating fine disperse solids and arrangement for carrying out the process
DE3724704A1 (en) * 1987-07-25 1989-02-02 Metallgesellschaft Ag METHOD FOR SEPARATING WORKPIECES AND MACHINING BODIES
JPH0612829Y2 (en) * 1991-07-27 1994-04-06 津木男 高田 Sorter

Also Published As

Publication number Publication date
EP0611275A1 (en) 1994-08-17
AT399105B (en) 1995-03-27
ATA26593A (en) 1994-08-15
DE59401174D1 (en) 1997-01-16

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