EP2239096B1 - Centrifugal force grinding machine with a device for setting the gap width - Google Patents

Centrifugal force grinding machine with a device for setting the gap width Download PDF

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Publication number
EP2239096B1
EP2239096B1 EP10002935A EP10002935A EP2239096B1 EP 2239096 B1 EP2239096 B1 EP 2239096B1 EP 10002935 A EP10002935 A EP 10002935A EP 10002935 A EP10002935 A EP 10002935A EP 2239096 B1 EP2239096 B1 EP 2239096B1
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EP
European Patent Office
Prior art keywords
container part
compression element
gap
finishing machine
machine according
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.)
Not-in-force
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EP10002935A
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German (de)
French (fr)
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EP2239096A1 (en
Inventor
Helmut Gegenheimer
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Otec Praezisionsfinish GmbH
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Otec Praezisionsfinish GmbH
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Publication date
Priority claimed from DE202009004268U external-priority patent/DE202009004268U1/en
Application filed by Otec Praezisionsfinish GmbH filed Critical Otec Praezisionsfinish GmbH
Publication of EP2239096A1 publication Critical patent/EP2239096A1/en
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Publication of EP2239096B1 publication Critical patent/EP2239096B1/en
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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
    • B24B31/10—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 involving other means for tumbling of work
    • B24B31/108—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 involving other means for tumbling of work involving a sectioned bowl, one part of which, e.g. its wall, is stationary and the other part of which is moved, e.g. rotated

Definitions

  • the invention relates to a centrifugal vibratory finishing machine with a stationary container part and the bottom of the stationary container part forming bottom part, which is rotatably mounted and displaceable by means of a drive in rotation, wherein between the bottom part and the stationary container part, a gap is formed whose width by means of a Device for adjusting the gap width is changeable.
  • Centrifugal grinding machines represent a special embodiment of grinding machines and are also referred to as disk grinding machines. They comprise a one-part or multi-part trained stationary container part and a generally substantially cup-shaped ausgestaltetes bottom part, the so-called plate, which is rotatably mounted and displaceable by means of a drive relative to the container part in rotation.
  • centrifugal vibratory finishing machines are used for the surface treatment of, in particular, relatively small workpieces (for example screws, needles, pins, jewelery etc.), which together with a processing medium in the form of grinding and / or polishing granules - if a wet machining of the workpieces is desired, if appropriate with the addition of a liquid processing auxiliary medium, such as water, surfactants or the like - are set into rotary motion. This is done by rotation of the bottom part relative to the stationary container part, so that the grit is moved with the granules to the outside, until it impinges on the inner wall of the stationary container part, where it is braked again.
  • a processing medium in the form of grinding and / or polishing granules - if a wet machining of the workpieces is desired, if appropriate with the addition of a liquid processing auxiliary medium, such as water, surfactants or the like -
  • the grinding or polishing granules can be of very different nature and, for example, of natural origin (eg of organic material such as walnut or coconut shells, wood, cherry stone etc.), mineral origin (eg silicates, oxides etc.) and / or of synthetic origin (eg plastics).
  • natural origin eg of organic material such as walnut or coconut shells, wood, cherry stone etc.
  • mineral origin eg silicates, oxides etc.
  • synthetic origin eg plastics
  • this gap is required either to guide the liquid processing auxiliary medium from below through the gap into the container, or the liquid processing aid medium is added to the container from above, eg by means of a hose, and through the gap through again dissipated.
  • an introduction of the processing auxiliary medium is provided in the container through the gap, this is usually done in that a liquid reservoir is provided in in which the processing auxiliary medium can be acted on with a predetermined pressure so that it can be inserted through the gap into the container. From there it can be removed, for example, via a central drainage in the area of the bottom part again. If the processing aid is introduced from above into the container and discharged through the gap, this can be done essentially without pressure due to gravity.
  • the gap width by means of a central, arranged on a central drive shaft of the bottom part means for adjusting the gap width to vary ( DE 43 11 689 A1 ).
  • a gap adjustment requires compliance with tight tolerances in the axial bearing clearance of the drive shaft and is thus complex and expensive.
  • a centrifugal vibratory finishing machine is known, the formed between the stationary container part and the rotatable bottom part gap under action of an elastic means, such as a sliding seal, a sealing lip or a spring, is closed, so that the passage of a liquid processing auxiliary medium in the wet processing in dependence its pressure against the force of the elastic means determines the gap width.
  • an elastic means such as a sliding seal, a sealing lip or a spring
  • a disadvantage of such a centrifugal vibratory finishing machine is that the annular gap both during dry machining and during the machining of workpieces whose diameter relative to the gap width is relatively large, so that in the gap no wear due to in this penetrating workpieces can be done , is always closed by the elastic means, so that the sliding along the rotating bottom part along elastic means is subject to constant wear and the drive of the bottom part constantly an emerge against frictional resistance.
  • EP 0 791 430 A1 is a centrifugal vibratory finishing machine with a stationary container part and a relative to this rotatable bottom part removable.
  • the first one is equipped with an interior lining made of polyurethane (PU).
  • PU polyurethane
  • In the region of the gap formed between the stationary container part and the rotatable bottom part is between the inner wall the container part and the PU lining arranged a compression element, which may be formed either by a porous rubber plate or by an air gap.
  • the compression element makes it possible for the PU lining to move away from the gap in the direction of the compression element, ie to the outside, so that the gap does not more narrowed or even closed.
  • the PU lining moves away from the gap in the direction of the compression element, ie to the outside, so that the gap does not more narrowed or even closed.
  • adjustment of the gap width with such a compression element is not possible.
  • the stationary container part is carried by a collecting container for receiving the liquid processing auxiliary medium.
  • expansion elements are again provided between the container part and the collecting container located underneath.
  • the expansion elements are provided either by an annular, hydraulically or pneumatically deformable hose or by a plurality of bellows distributed around the circumference of the container part may be formed, the length of which is also hydraulically or pneumatically variable to adjust the gap width can.
  • the expansion elements may be formed by an elastic ring which is biased by means of the stationary container part and the collecting vessel passing through the clamping screws.
  • the invention is therefore the object of developing a centrifugal vibratory finishing machine of the type mentioned in such a way that the gap width of between the stationary container part and the rotatably mounted bottom part existing annular gap in a simpler and thus more cost-effective, but nevertheless effective manner is exactly varied.
  • this object is achieved in a centrifugal vibratory finishing machine of the type mentioned in that the means for adjusting the gap width comprises at least a portion of the outer periphery of the stationary container part embracing compression element with variable scope, and that the wall thickness and / or the material of the stationary Container part is selected at least in the area encompassed by the compression element such that its cross section is reversibly reduced by compressing the compression element.
  • the inventive design allows a particularly simple and cost-effective adjustment of the gap width of the annular gap formed between the stationary container part and the rotating bottom part by the outside of the stationary container part arranged and this at least partially embracing compression element by reducing its circumference is reversibly, ie elastically deformed, wherein the peripheral wall of the stationary container part is elastically deformed radially inward in the case of compression of the compression element and reduces the gap accordingly.
  • the annular gap is increased when the circumference of the compression element is increased and the circumferential wall of the stationary container part thereby elastically deforms or "resets" radially outward.
  • the invention makes any in the interior of the container or in internal coatings of the same arranged hydraulic or pneumatic Facilities with corresponding accessories, such as pressure pipes, etc. dispensable.
  • the gap width of the annular gap formed between the stationary container part and the rotatable bottom part should preferably be changeable at least in a range between about 0.1 mm and about 1 mm, in particular between about 0.1 mm and about 0.5 mm, whereby of course also larger gap width intervals are possible.
  • the gap width in the unloaded state of the stationary container part - i. without the compressive effect of the compression element - correspond substantially to the largest desired gap width, in order to reduce them under the action of the compression element by varying its circumference to the desired amount.
  • the compression element, the stationary container part to a peripheral portion of at least 75%, in particular of at least 90%, preferably substantially completely, surrounds.
  • the compression element in its stationary container part encompassing area of the stationary container part substantially completely applied.
  • the compression element Of course, over several, in particular evenly or approximately equidistantly distributed around the circumference of the stationary container part arranged areas abut the stationary container part, wherein the distance of these contact areas should be chosen sufficiently small to achieve an elastic deformation of the peripheral wall of the stationary container part inward so that the wall is deformed fully elastically inwards by the same radial distance and consequently a uniform annular gap is formed.
  • the compression element has an inner circumference substantially complementary to the outer circumference of the stationary container part.
  • the compression element compliant e.g. elastic
  • the compression element compliant is designed to be able to adapt to the outer circumference of the stationary container part.
  • the circumference of the compression element is hydraulically, pneumatically and / or hydropneumatically changed.
  • the hydraulic, pneumatic and / or hydropneumatic compression element can be formed in this case, for example in the form of a stationary container part encompassing hose, which can be acted upon by fluid pressure, which can be done for example by connecting the hose to a pressure fluid reservoir, for example, a control valve for adjustment of the respective elastic deformation of the stationary container part, which corresponds to the respective desired gap width, required pressure inside the hose is used.
  • the circumference of the compression element is mechanically, in particular by means of a mechanical adjusting device, such as at least one screw, changeable.
  • a mechanical adjusting device such as at least one screw
  • the circumference of the mechanical compression element can in this case be variable by motor, in particular electrically, wherein expediently a controlled motor adjustment can be provided. If, for example, the adjusting device comprises one or more tightening screws, these may be e.g. be driven controlled by an electric motor.
  • the mechanical compression element may in this case be designed, for example, in the manner of a hose clamp, which surrounds the outer circumference of the stationary container part and can be tensioned by means of an adjusting device of the aforementioned type while reducing its circumference.
  • a hose clamp can be designed in particular yielding.
  • the mechanical compression element is designed in the manner of a chain with a plurality of relatively pivotable members, wherein at least one pivot axis of the chain links should be arranged substantially parallel to the longitudinal central axis of the container of the centrifugal vibratory finishing machine, so that each Chain link can create the stationary container part from the outside.
  • the mechanical compression element may, for example, also be in the form of two mutually bracing half rings, preferably with an inner contour substantially corresponding to the outer circumference of the stationary container part, the half rings being e.g. each encompass approximately half the circumference of the stationary container part and also may be designed to be flexible or substantially rigid.
  • An adjustment of the aforementioned type can serve in this case to brace the half-rings under elastic deformation of the stationary container part radially inwardly against each other.
  • the mechanical compression element may e.g. be made of metal, such as aluminum sheet steel or the like.
  • a corresponding embodiment would, of course, also conceivable with third, quarter rings etc. as an alternative.
  • the compression element is arranged in the axial region of the gap formed between the rotatable bottom part and the stationary container part, so that the annular gap formed between the stationary container part and the rotatable bottom part is at approximately the same axial level like the compression element.
  • the stationary container part may moreover have an abutment for abutment against the compression element in order to be able to easily attach it to the stationary container part at a suitable position, in particular in the region of the axial level of the gap formed between it and the rotatable bottom part.
  • the stationary container part In order to impart the required elasticity to the stationary container part at least in its area embraced by the compression element, it can be made, for example, at least in its area encompassed by the compression element or of course entirely made of plastic, in particular polyurethane.
  • plastic in particular polyurethane.
  • other materials such as metal or metal alloys including steel, aluminum or the like are also contemplated and it will be readily apparent to those skilled in the art, e.g.
  • the invention is particularly - although not necessarily - suitable for such centrifugal vibratory finishing machines, in which the outside of the gap formed between the stationary container part and the rotatable bottom part, a reservoir corresponding to the gap is provided for receiving a liquid processing auxiliary medium, to ensure a wet machining of workpieces.
  • the liquid processing aid may in this case be known as such Way under pressure from the reservoir through the gap to be transferred into the interior of the container.
  • the invention is particularly - although not necessarily - for such centrifugal vibratory finishing machines on which the outside of the gap formed between the stationary container part and the rotatable bottom part a corresponding with the gap drain for discharging a - for example, from above into the stationary Container part added - liquid processing auxiliary medium is provided to also allow a wet machining of workpieces.
  • the reproduced in the drawing centrifugal vibratory finishing machine comprises a stationary container part 1 and a bottom of the same forming, rotatably mounted on a central shaft 2 bottom part 3, the so-called plate, which is displaceable by means of a drive motor, not shown in rotation.
  • the bottom part 3 or the plate is, for example, approximately cup-shaped and has a carrying part 3a provided with a wear-resistant inner coating 3b, for example made of polyurethane.
  • the bottom part 3 may be provided with inwardly extending ribs or blades 3c to enhance the transmission of rotational movement thereof to the material being grinded.
  • the stationary container part 1 in turn, for example, made of polyurethane or optionally have a corresponding inner coating (not shown), wherein the wall thickness of the stationary container part 1 is chosen depending on its material such that it has a certain elastic deformability, in particular an elastic deformability of circumferential or shell-side wall of the container part 1 should be ensured by at least about 1 mm or more radially inward.
  • the stationary container part 1 also has immediately above the peripheral edge of the bottom part 2 in the direction of the bottom part 2 towards tapered peripheral portion 1 a, for a uniform promotion of a processing medium in the form of grinding and / or polishing granules during operation, during which Bottom part 2 rotates to provide along the peripheral wall of the container part 1 upwards, wherein the granules are promoted together with the workpieces to be machined due to centrifugal forces upwards and not unnecessarily braked in the upward movement.
  • an upper portion of the container part 1 is provided on the inside with ribs 1b, which contribute to a more effective vibratory finishing and in the present case extend approximately perpendicularly in the axial direction of the stationary container part 1.
  • ribs 1b are not mandatory or they can be designed differently depending on the desired processing result, such as according to the DE 102 53 883 B3 ,
  • a gap 4 is formed in the form of an annular gap, which is e.g. has a width of about 0.5 mm and in the present embodiment, if necessary, allows the passage of a liquid processing auxiliary medium, which is located in an outside of the gap 4 and with this corresponding reservoir 5.
  • the reservoir 5 can be pressurized in order to be able to transfer it through the gap 4 into the interior of the container.
  • a corresponding liquid processing medium may be provided to the stationary container part 1 e.g. also added via its upper opening and be discharged through the gap 4 through from the container, the connecting piece 6 can serve in this case for the derivation of the liquid processing auxiliary medium.
  • the width of the annular gap 4 is variable by means of a device 10 for adjusting the gap width, which has a the periphery of the stationary container part 1 - in the present case substantially completely - embracing compression element 11 with variable circumference.
  • the compression element 11 is in the embodiment shown, the stationary container part 1 on the outside substantially completely to deform the circumference of the compression member 11, the shell-side wall of the container part 1 fully elastically by the same radial distance inwards and thus a constant width around the entire circumference of the annular gap 4.
  • it has an inner circumference which is approximately complementary to the outer circumference of the container part 1 and is, in particular, yielding, for example elastic, in order to form the outer circumference of the container part 1 to adapt.
  • the circumference of the compression element may in particular be mechanically, as by means of one or more screws (not shown), changeable, wherein the compression element 11, for example in the manner of a band-shaped hose clamp, for example, aluminum, steel sheet, etc., may be configured.
  • the compression element 11 is clamped on an axial level of the stationary container part 1 around its circumference, on which also the present between the container part 1 and the bottom part 3, annular gap 4 is located, wherein the gap 4 in the present embodiment, approximately in the middle of in Axially direction considered width B of the compression element 11 is arranged.
  • An abutment against the lower end face of the compression element 11 serving in the drawing is formed on the outside of the circumferential wall of the stationary container part 1 in the form of a circumferential step, so that a simple and quick attachment of the compression element 11 to the container part 1 at the appropriate position possible is.
  • the illustrated device 10 for adjusting the gap width with the compression element 11 thus ensures the mechanical compression or tightening of the compression element 11 for elastic deformation of the circumferential wall of the stationary container part 1 in the region of the gap 4 radially inwardly, whereby the gap width up to a practically complete closure of the gap can be reduced. Due to the elasticity of the container material, this process is reversible, ie in the case of a loosening of the compression element 11 widens the stationary Container part 1 again under enlargement of the gap 4 radially outward.

Abstract

The machine has a base part (3) for forming a base of a stationary container part (1), and a gap (4) formed between the base part and the container part. A gap width adjusting device (10) changes width of the gap and has a compression element (11) surrounding a section of an external circumference of the container part. Wall thickness and/or material of the container part in an area surrounded by the compression element are selected such that cross section of the container part is reversibly reduced by compressing the compression element.

Description

Die Erfindung betrifft eine Fliehkraft-Gleitschleifmaschine mit einem stationären Behälterteil und einem den Boden des stationären Behälterteils bildenden Bodenteil, welches drehbar gelagert und mittels eines Antriebs in Rotation versetzbar ist, wobei zwischen dem Bodenteil und dem stationären Behälterteil ein Spalt gebildet ist, dessen Breite mittels einer Einrichtung zur Einstellung der Spaltbreite veränderbar ist.The invention relates to a centrifugal vibratory finishing machine with a stationary container part and the bottom of the stationary container part forming bottom part, which is rotatably mounted and displaceable by means of a drive in rotation, wherein between the bottom part and the stationary container part, a gap is formed whose width by means of a Device for adjusting the gap width is changeable.

Fliehkraft-Schleifmaschinen stellen eine spezielle Ausgestaltung von Schleifmaschinen dar und werden auch als Tellerschleifmaschinen bezeichnet. Sie umfassen ein ein- oder mehrteilig ausgebildetes stationäres Behälterteil und ein in der Regel im Wesentlichen schalenförmig ausgestaltetes Bodenteil, den sogenannten Teller, welches drehbar gelagert und mittels eines Antriebs relativ zu dem Behälterteil in Rotation versetzbar ist. Solche Fliehkraft-Gleitschleifmaschinen finden zur Oberflächenbearbeitung von insbesondere verhältnismäßig kleinen Werkstücken (beispielsweise Schrauben, Nadeln, Stifte, Schmuckstücke etc.) Verwendung, welche gemeinsam mit einem Bearbeitungsmedium in Form von Schleif- und/oder Poliergranulat - sofern eine Nassbearbeitung der Werkstücke erwünscht ist gegebenenfalls unter Zusatz eines flüssigen Bearbeitungshilfsmediums, wie Wasser, Tenside oder dergleichen - in Rotationsbewegung versetzt werden. Dies geschieht durch Drehung des Bodenteils relativ zu dem stationären Behälterteil, so dass das Schleifgut mit dem Granulat nach außen bewegt wird, bis es auf die Innenwandung des stationären Behälterteils auftrifft, wo es wieder abgebremst wird. Durch von unten nachströmendes Material stellt sich eine umlaufende Bewegung ein, welche eine intensive Schleif- bzw. Polierwirkung verursacht. Das Schleif- oder Poliergranulat kann dabei je nach zu behandelnden Werkstücken unterschiedlichster Natur und z.B. natürlichen Ursprungs (z.B. aus organischem Material, wie Walnuss- oder Kokosnussschalen, Holz, Kirschkern etc.), mineralischen Ursprungs (z.B. Silikaten, Oxiden etc.) und/oder synthetischen Ursprungs (z.B. Kunststoffen) sein.Centrifugal grinding machines represent a special embodiment of grinding machines and are also referred to as disk grinding machines. They comprise a one-part or multi-part trained stationary container part and a generally substantially cup-shaped ausgestaltetes bottom part, the so-called plate, which is rotatably mounted and displaceable by means of a drive relative to the container part in rotation. Such centrifugal vibratory finishing machines are used for the surface treatment of, in particular, relatively small workpieces (for example screws, needles, pins, jewelery etc.), which together with a processing medium in the form of grinding and / or polishing granules - if a wet machining of the workpieces is desired, if appropriate with the addition of a liquid processing auxiliary medium, such as water, surfactants or the like - are set into rotary motion. This is done by rotation of the bottom part relative to the stationary container part, so that the grit is moved with the granules to the outside, until it impinges on the inner wall of the stationary container part, where it is braked again. By flowing from below material sets a circumferential movement, which causes an intense grinding or polishing effect. Depending on the workpieces to be treated, the grinding or polishing granules can be of very different nature and, for example, of natural origin (eg of organic material such as walnut or coconut shells, wood, cherry stone etc.), mineral origin (eg silicates, oxides etc.) and / or of synthetic origin (eg plastics).

Zwischen dem stationären Behälterteil und dem drehbaren Bodenteil ist üblicherweise ein Spalt - bzw. genauer: ein Ringspalt - gebildet, um einerseits einen Verschleiß der beiden relativ zueinander bewegten Teile möglichst zu vermeiden. Andererseits ist dieser Spalt im Falle einer gewünschten Nassbearbeitung der Werkstücke erforderlich, um das flüssige Bearbeitungshilfsmedium entweder von unten durch den Spalt hindurch in den Behälter zu leiten, oder das flüssige Bearbeitungshilfsmedium wird dem Behälter von oben, z.B. mittels eines Schlauches, zugesetzt und durch den Spalt hindurch wieder abgeführt. Sofern ein Einleiten des Bearbeitungshilfsmediums in den Behälter durch den Spalt vorgesehen ist, so geschieht dies in der Regel dadurch, dass ein Flüssigkeitsreservoir vorgesehen ist, in welchem das Bearbeitungshilfsmedium mit einem vorgegebenen Druck beaufschlagbar ist, so dass es durch den Spalt hindurch in den Behälter einführbar ist. Von dort kann es beispielsweise über eine zentrale Entwässerung im Bereich des Bodenteils wieder abgeführt werden. Sofern das Bearbeitungshilfsmedium von oben in den Behälter eingeleitet und durch den Spalt hindurch abgeführt wird, so kann dies im Wesentlichen drucklos infolge Schwerkraft erfolgen.Between the stationary container part and the rotatable bottom part is usually a gap - or more precisely an annular gap - formed to avoid on the one hand wear of the two relatively moving parts as possible. On the other hand, in the case of a desired wet machining of the workpieces, this gap is required either to guide the liquid processing auxiliary medium from below through the gap into the container, or the liquid processing aid medium is added to the container from above, eg by means of a hose, and through the gap through again dissipated. If an introduction of the processing auxiliary medium is provided in the container through the gap, this is usually done in that a liquid reservoir is provided in in which the processing auxiliary medium can be acted on with a predetermined pressure so that it can be inserted through the gap into the container. From there it can be removed, for example, via a central drainage in the area of the bottom part again. If the processing aid is introduced from above into the container and discharged through the gap, this can be done essentially without pressure due to gravity.

Zwar wird bereits versucht, den Spalt so gering wie möglich zu halten, damit die Schleif- bzw. Polierkörper des Bearbeitungsmediums infolge der Rotationsbewegung des Bodenteils möglichst nicht in den Spalt hineingeraten oder gar durch den Spalt nach außen gepresst werden, jedoch ist je nach Betriebsbedingungen der Fliehkraft-Gleitschleifmaschine häufig ein Spalt mit einer Spaltbreite in der Größenordnung von etwa 0,1 mm bis etwa 0,5 mm noch erforderlich, was dazu führt, dass keine sehr kleine bzw. dünne Werkstücke bearbeitet, solche Werkstücke durch Einklemmen im Spalt beschädigt werden können und auch die kleinste Partikelfraktion der Schleif- bzw. Polierkörper eine gewisse Größe nicht unterschreiten dürfen. Ein Eindringen der Schleif- bzw. Polierkörper in den Spalt führt wiederum zu einem Verschleiß sowohl des stationären Behälterteils als auch des drehbaren Bodenteils, welcher sich mit zunehmender Spaltbreite progressiv entwickeln kann, da mit zunehmendem Verschleiß immer größere Partikel in den Spalt eindringen und zugleich an beiden Spaltflächen Schleifeffekte bewirken können.Although it is already trying to keep the gap as low as possible, so that the grinding or polishing of the machining medium as possible as a result of the rotation of the bottom part not get into the gap or even pressed through the gap to the outside, however, depending on the operating conditions Centrifugal vibratory finishing machine often a gap with a gap width of the order of about 0.1 mm to about 0.5 mm still required, resulting in that no very small or thin workpieces machined, such workpieces can be damaged by pinching in the gap and even the smallest particle fraction of the grinding or polishing body must not fall below a certain size. Ingress of the grinding or polishing body in the gap in turn leads to wear of both the stationary container part and the rotatable bottom part, which can progressively develop with increasing gap width, since with increasing wear ever larger particles penetrate into the gap and at the same time on both Cleavage surfaces can cause grinding effects.

Um einen solchen in dem Spalt auftretenden Verschleiß zu verringern und auf diese Weise die Standzeit des Bodenteils zu erhöhen, ist es beispielsweise bekannt, die Spaltbreite mittels einer zentralen, an einer zentralen Antriebswelle des Bodenteils angeordneten Einrichtung zur Einstellung der Spaltbreite zu variieren ( DE 43 11 689 A1 ). Eine derartige Spaltverstellung erfordert jedoch die Einhaltung engen Toleranzen im Bereich des Axiallagerspiels der Antriebswelle und ist somit aufwändig und teuer.In order to reduce such wear occurring in the gap and in this way to increase the service life of the bottom part, it is known, for example, the gap width by means of a central, arranged on a central drive shaft of the bottom part means for adjusting the gap width to vary ( DE 43 11 689 A1 ). However, such a gap adjustment requires compliance with tight tolerances in the axial bearing clearance of the drive shaft and is thus complex and expensive.

Aus der DE 195 42 541 A1 ist eine Fliehkraft-Gleitschleifmaschine bekannt, deren zwischen dem stationären Behälterteil und dem drehbaren Bodenteil gebildeter Spalt unter Wirkung eines elastischen Mittels, wie einer Gleitdichtung, einer Dichtungslippe oder einer Feder, verschlossen ist, so dass der Durchtritt eines flüssigen Bearbeitungshilfsmediums bei der Nassbearbeitung in Abhängigkeit von dessen Druck gegen die Kraft des elastischen Mittels die Spaltbreite bestimmt. Ein Nachteil einer derartigen Fliehkraft-Gleitschleifmaschine besteht darin, dass der Ringspalt sowohl bei der Trockenbearbeitung als auch bei der Bearbeitung von Werkstücken, deren Durchmesser gegenüber der Spaltbreite relativ groß ist, so dass in dem Spalt gar kein Verschleiß infolge von in diesen eindringende Werkstücke erfolgen kann, stets von dem elastischen Mittel verschlossen ist, so dass das an dem rotierenden Bodenteil entlang gleitende elastische Mittel einem ständigen Verschleiß unterworfen ist und der Antrieb des Bodenteils ständig gegen einen Reibungswiderstand anfährt.From the DE 195 42 541 A1 a centrifugal vibratory finishing machine is known, the formed between the stationary container part and the rotatable bottom part gap under action of an elastic means, such as a sliding seal, a sealing lip or a spring, is closed, so that the passage of a liquid processing auxiliary medium in the wet processing in dependence its pressure against the force of the elastic means determines the gap width. A disadvantage of such a centrifugal vibratory finishing machine is that the annular gap both during dry machining and during the machining of workpieces whose diameter relative to the gap width is relatively large, so that in the gap no wear due to in this penetrating workpieces can be done , is always closed by the elastic means, so that the sliding along the rotating bottom part along elastic means is subject to constant wear and the drive of the bottom part constantly anfährt against frictional resistance.

Der EP 0 791 430 A1 ist eine Fliehkraft-Gleitschleifmaschine mit einem stationären Behälterteil und einem relativ zu diesem drehbaren Bodenteil entnehmbar. Ersteres ist mit einer Innenauskleidung aus Polyurethan (PU) versehen. Im Bereich des zwischen dem stationären Behälterteil und dem drehbaren Bodenteil gebildeten Spaltes ist zwischen der Innenwandung des Behälterteils und der PU-Auskleidung ein Kompressionselement angeordnet, welches entweder von einer porösen Gummiplatte oder von einem Luftspalt gebildet sein kann. Das Kompressionselement macht es im Falle einer thermischen Ausdehnung des Behälterteils bzw. insbesondere dessen PU-Auskleidung und/oder des Bodenteils möglich, dass die PU-Auskleidung in Richtung des Kompressionselementes von dem Spalt fort - d.h. nach außen - ausweicht, so dass der Spalt nicht mehr verengt oder gar verschlossen wird. Indes ist abgesehen von der relativ aufwändigen und somit teuren konstruktiven Ausgestaltung eine Einstellung der Spaltbreite mit einem solchen Kompressionselement nicht möglich.Of the EP 0 791 430 A1 is a centrifugal vibratory finishing machine with a stationary container part and a relative to this rotatable bottom part removable. The first one is equipped with an interior lining made of polyurethane (PU). In the region of the gap formed between the stationary container part and the rotatable bottom part is between the inner wall the container part and the PU lining arranged a compression element, which may be formed either by a porous rubber plate or by an air gap. In the case of a thermal expansion of the container part or in particular its PU lining and / or the bottom part, the compression element makes it possible for the PU lining to move away from the gap in the direction of the compression element, ie to the outside, so that the gap does not more narrowed or even closed. However, apart from the relatively complex and thus expensive structural design, adjustment of the gap width with such a compression element is not possible.

Eine weitere Fliehkraft-Gleitschleifmaschine ist aus der US 4 939 871 A bekannt, deren stationäres Behälterteil von einem Sammelbehälter zur Aufnahme des flüssigen Bearbeitungshilfsmediums getragen ist. Zur Einstellung des zwischen dem rotierbaren Bodenteil und dem stationären Behälterteil gebildeten Spaltes sind zwischen dem Behälterteil und dem unterhalb desselben vorhandenen Sammelbehälters wiederum Expansionselemente vorgesehen, welche entweder von einem ringförmigen, hydraulisch oder pneumatisch verformbaren Schlauch oder von mehreren, um den Umfang des Behälterteils verteilt angeordneten Bälgen gebildet sein können, deren Länge gleichfalls hydraulisch oder pneumatisch veränderbar ist, um die Spaltbreite einstellen zu können. Darüber hinaus können die Expansionselemente von einem elastischen Ring gebildet sein, welcher mittels das stationäre Behälterteil und den Sammelbehälter durchsetzenden Spannschrauben vorbelastet ist. Auch diese Lösung ist in konstruktiver Hinsicht verhältnismäßig aufwändig und teuer und erfordert überdies zwingend einen separaten Sammelbehälter, welcher das Bodenteil aufnimmt. Letzteres führt auch dazu, dass die Expansionselemente derart ausgelegt sein müssen, dass sie praktisch das gesamte Gewicht der eigentlichen Fliehkraft-Gleitschleifmaschine zu tragen vermögen. Entsprechendes gilt für die Auslegung der Hydraulik- oder Pneumatikleitungen, welche den hierzu erforderlichen Drucken des Druckfluides standhalten müssen. Schließlich besteht während des Betriebs von Fliehkraft-Gleitschleifmaschinen grundsätzlich die Gefahr, dass es aufgrund des rotierenden Bodenteils und der in dem Behälter umgewälzten Schleifmischung zu Schwingungen kommt, welche bei der Lösung gemäß der US 4 939 871 A zu periodischen Veränderungen der Spaltbreite führen, weil die elastischen Expansionselemente, welche das stationäre Behälterteil tragen, aufgrund ihrer notwendigen Elastizität die Schwingungen nicht oder zumindest nicht ausreichend aufzunehmen vermögen.Another centrifugal vibratory finishing machine is from the US 4,939,871 A known, the stationary container part is carried by a collecting container for receiving the liquid processing auxiliary medium. To adjust the gap formed between the rotatable bottom part and the stationary container part, expansion elements are again provided between the container part and the collecting container located underneath. The expansion elements are provided either by an annular, hydraulically or pneumatically deformable hose or by a plurality of bellows distributed around the circumference of the container part may be formed, the length of which is also hydraulically or pneumatically variable to adjust the gap width can. In addition, the expansion elements may be formed by an elastic ring which is biased by means of the stationary container part and the collecting vessel passing through the clamping screws. This solution is relatively complex and expensive in terms of design and also requires a separate collection container, which necessarily picks up the bottom part. The latter also means that the expansion elements must be designed so that they are able to carry virtually the entire weight of the actual centrifugal vibratory finishing machine. The same applies to the design of the hydraulic or pneumatic lines, which must withstand the required printing of the pressure fluid. Finally, during the operation of centrifugal vibratory finishing machines, there is a general risk that, due to the rotating bottom part and the grinding mixture circulated in the container, vibrations will occur in the solution according to the invention US 4,939,871 A lead to periodic changes in the gap width, because the elastic expansion elements, which carry the stationary container part, due to their necessary elasticity the vibrations are not or at least not sufficiently able to absorb.

Die DE 198 43 366 B4 beschreibt schließlich eine Fliehkraft-Gleitschleifmaschine, dessen stationäres Behälterteil und/oder deren drehbares Bodenteil eine elastische Auskleidung aufweist, innerhalb welcher ein mit einem einstellbaren Druck beaufschlagbares Expansionselement angeordnet ist, so dass die Spaltbreite mit zunehmendem Innendruck des Expansionselementes verringerbar ist. Obgleich sich eine solche Ausgestaltung in der Praxis bewährt hat und eine wirksame Spaltverstellung gewährleistet, ist die konstruktive Ausgestaltung einschließlich der erforderlichen hydraulischen oder pneumatischen Mittel zur Druckbeaufschlagung des Expansionselementes relativ aufwändig und teuer.The DE 198 43 366 B4 Finally, describes a centrifugal vibratory finishing machine whose stationary container part and / or its rotatable bottom part has an elastic lining, within which an adjustable pressure can be applied to an expansion element is arranged, so that the gap width can be reduced with increasing internal pressure of the expansion element. Although such a design has been proven in practice and ensures effective gap adjustment, the structural design including the required hydraulic or pneumatic means for pressurizing the expansion element is relatively complex and expensive.

Der Erfindung liegt die daher Aufgabe zugrunde, eine Fliehkraft-Gleitschleifmaschine der eingangs genannten Art dahingehend weiterzubilden, dass die Spaltbreite des zwischen dem stationären Behälterteil und dem drehbar gelagerten Bodenteil vorhandenen Ringspaltes in einfacherer und somit kostengünstigerer, aber gleichwohl effektiver Weise exakt variierbar ist.The invention is therefore the object of developing a centrifugal vibratory finishing machine of the type mentioned in such a way that the gap width of between the stationary container part and the rotatably mounted bottom part existing annular gap in a simpler and thus more cost-effective, but nevertheless effective manner is exactly varied.

Erfindungsgemäß wird diese Aufgabe bei einer Fliehkraft-Gleitschleifmaschine der eingangs genannten Art dadurch gelöst, dass die Einrichtung zur Einstellung der Spaltbreite ein zumindest einen Abschnitt des Außenumfangs des stationären Behälterteil umgreifendes Kompressionselement mit veränderbarem Umfang umfasst, und dass die Wandstärke und/oder das Material des stationären Behälterteils zumindest in dem von dem Kompressionselement umgriffenen Bereich derart gewählt ist, dass sein Querschnitt durch Komprimieren des Kompressionselementes reversibel verkleinerbar ist.According to the invention this object is achieved in a centrifugal vibratory finishing machine of the type mentioned in that the means for adjusting the gap width comprises at least a portion of the outer periphery of the stationary container part embracing compression element with variable scope, and that the wall thickness and / or the material of the stationary Container part is selected at least in the area encompassed by the compression element such that its cross section is reversibly reduced by compressing the compression element.

Die erfindungsgemäße Ausgestaltung ermöglicht eine besonders einfache und kostengünstige Verstellung der Spaltbreite des zwischen dem stationären Behälterteil und dem rotierenden Bodenteil gebildeten Ringspaltes, indem das außenseitig des stationären Behälterteils angeordnete und dieses zumindest teilweise umgreifende Kompressionselement durch Verkleinern von dessen Umfang reversibel, d.h. elastisch, verformt wird, wobei die umfängliche Wandung des stationären Behälterteils im Falle einer Kompression des Kompressionselementes elastisch radial nach innen verformt wird und den Spalt entsprechend verkleinert. Umgekehrt wird der Ringspalt vergrößert, wenn der Umfang des Kompressionselementes vergrößert wird und sich die umfängliche Wandung des stationären Behälterteils hierdurch wieder elastisch radial nach außen verformt bzw. "zurückstellt". Dabei macht die Erfindung jegliche im Innern des Behälters oder in Innenbeschichtungen desselben angeordnete hydraulische oder pneumatische Einrichtungen mit entsprechendem Zubehör, wie Druckleitungen etc., entbehrlich.The inventive design allows a particularly simple and cost-effective adjustment of the gap width of the annular gap formed between the stationary container part and the rotating bottom part by the outside of the stationary container part arranged and this at least partially embracing compression element by reducing its circumference is reversibly, ie elastically deformed, wherein the peripheral wall of the stationary container part is elastically deformed radially inward in the case of compression of the compression element and reduces the gap accordingly. Conversely, the annular gap is increased when the circumference of the compression element is increased and the circumferential wall of the stationary container part thereby elastically deforms or "resets" radially outward. The invention makes any in the interior of the container or in internal coatings of the same arranged hydraulic or pneumatic Facilities with corresponding accessories, such as pressure pipes, etc. dispensable.

Die Spaltbreite des zwischen dem stationären Behälterteil und dem drehbaren Bodenteil gebildeten Ringspaltes sollte vorzugsweise zumindest in einem Bereich zwischen etwa 0,1 mm und etwa 1 mm, insbesondere zwischen etwa 0,1 mm und etwa 0,5 mm, veränderbar sein, wobei selbstverständlich auch größere Spaltbreitenintervalle möglich sind. In jedem Fall kann die Spaltbreite im unbelasteten Zustand des stationären Behälterteils - d.h. ohne die komprimierende Wirkung des Kompressionselementes - im Wesentlichen der größten gewünschten Spaltbreite entsprechen, um sie unter der Wirkung des Kompressionselementes durch Verändern von dessen Umfang auf den gewünschten Betrag verkleinern zu können.The gap width of the annular gap formed between the stationary container part and the rotatable bottom part should preferably be changeable at least in a range between about 0.1 mm and about 1 mm, in particular between about 0.1 mm and about 0.5 mm, whereby of course also larger gap width intervals are possible. In any case, the gap width in the unloaded state of the stationary container part - i. without the compressive effect of the compression element - correspond substantially to the largest desired gap width, in order to reduce them under the action of the compression element by varying its circumference to the desired amount.

Um eine gleichmäßige, radial nach innen gerichtete elastische Verformung des stationären Behälterteils unter der Wirkung des Kompressionselementes und somit eine möglichst konstante Breite des Ringspaltes zu erzielen, sieht eine vorteilhafte Ausgestaltung vor, dass das Kompressionselement das stationäre Behälterteil um einen Umfangsabschnitt von wenigstens 75%, insbesondere von wenigstens 90%, vorzugsweise im Wesentlichen vollständig, umgreift.In order to achieve a uniform, radially inwardly directed elastic deformation of the stationary container part under the action of the compression element and thus a constant width of the annular gap, provides an advantageous embodiment that the compression element, the stationary container part to a peripheral portion of at least 75%, in particular of at least 90%, preferably substantially completely, surrounds.

Darüber hinaus kann im Hinblick auf eine möglichst gleichmäßige, radial nach innen gerichtete elastische Verformung des stationären Behälterteils unter der Wirkung des Kompressionselementes vorgesehen sein, dass das Kompressionselement in seinem das stationäre Behälterteil umgreifenden Bereich dem stationären Behälterteil im Wesentlichen vollständig anliegt. Alternativ kann das Kompressionselement selbstverständlich auch über mehrere, um den Umfang des stationären Behälterteils insbesondere gleichmäßig bzw. etwa äquidistant verteilt angeordnete Bereiche dem stationären Behälterteil anliegen, wobei der Abstand dieser Kontaktbereiche hinreichend klein gewählt werden sollte, um eine elastische Verformung der umfänglichen Wandung des stationären Behälterteils nach innen zu erreichen, so dass die Wandung vollumfänglich elastisch um denselben radialen Abstand nach innen verformt und folglich ein gleichmäßiger Ringspalt gebildet wird.In addition, with regard to the most uniform, radially inwardly directed elastic deformation of the stationary container part under the action of the compression element may be provided that the compression element in its stationary container part encompassing area of the stationary container part substantially completely applied. Alternatively, the compression element Of course, over several, in particular evenly or approximately equidistantly distributed around the circumference of the stationary container part arranged areas abut the stationary container part, wherein the distance of these contact areas should be chosen sufficiently small to achieve an elastic deformation of the peripheral wall of the stationary container part inward so that the wall is deformed fully elastically inwards by the same radial distance and consequently a uniform annular gap is formed.

Zu diesem Zweck kann gemäß einer bevorzugten Ausführungsform vorgesehen sein, dass das Kompressionselement einen zu dem Außenumfang des stationären Behälterteils im Wesentlichen komplementären Innenumfang aufweist.For this purpose, according to a preferred embodiment, it may be provided that the compression element has an inner circumference substantially complementary to the outer circumference of the stationary container part.

Darüber hinaus kann zu diesem Zweck vorgesehen sein, dass das Kompressionselement nachgiebig, z.B. elastisch, ausgestaltet ist, um sich dem Außenumfang des stationären Behälterteils anpassen zu können.In addition, for this purpose it can be provided that the compression element compliant, e.g. elastic, is designed to be able to adapt to the outer circumference of the stationary container part.

Gemäß einer Ausführungsform des Kompressionselementes kann vorgesehen sein, dass der Umfang des Kompressionselementes hydraulisch, pneumatisch und/oder hydropneumatisch veränderbar ist. Das hydraulische, pneumatische und/oder hydropneumatische Kompressionselement kann in diesem Fall beispielsweise in Form eines das stationäre Behälterteil umgreifenden Schlauches gebildet sein, welcher mit Fluiddruck beaufschlagbar ist, was z.B. durch den Anschluss des Schlauches an ein Druckfluidreservoir geschehen kann, wobei beispielsweise ein Steuerventil zur Einstellung des für die jeweilige elastische Verformung des stationären Behälterteils, welche der jeweils gewünschten Spaltbreite entspricht, erforderlichen Druckes im Innern des Schlauches dient. Eine Erhöhung des Innendrucks des Schlauches führt folglich zu einer radialen Aufweitung desselben, was wiederum in einer elastischen Verformung der Umfangswandung des stationären Behälterteils radial nach innen unter Verkleinerung des zwischen diesem und dem drehbaren Bodenteil vorhandenen Ringspaltes resultiert.According to one embodiment of the compression element can be provided that the circumference of the compression element is hydraulically, pneumatically and / or hydropneumatically changed. The hydraulic, pneumatic and / or hydropneumatic compression element can be formed in this case, for example in the form of a stationary container part encompassing hose, which can be acted upon by fluid pressure, which can be done for example by connecting the hose to a pressure fluid reservoir, for example, a control valve for adjustment of the respective elastic deformation of the stationary container part, which corresponds to the respective desired gap width, required pressure inside the hose is used. An increase in the internal pressure of the hose thus leads to a radial widening of the same, which in turn results in an elastic deformation of the peripheral wall of the stationary container part radially inwardly, reducing the annular gap existing between the latter and the rotatable bottom part.

Gemäß einer alternativen Ausführungsform des Kompressionselementes kann vorgesehen sein, dass der Umfang des Kompressionselementes mechanisch, insbesondere mittels einer mechanischen Verstelleinrichtung, wie beispielsweise wenigstens einer Schraube, veränderbar ist. Eine solche Ausführungsform stellt eine besonders einfache und kostengünstige Ausgestaltung der Erfindung dar und kommt gänzlich ohne hydraulische oder pneumatische Einrichtungen aus.According to an alternative embodiment of the compression element it can be provided that the circumference of the compression element is mechanically, in particular by means of a mechanical adjusting device, such as at least one screw, changeable. Such an embodiment is a particularly simple and inexpensive embodiment of the invention and is completely without hydraulic or pneumatic devices.

Der Umfang des mechanischen Kompressionselementes kann hierbei motorisch, insbesondere elektrisch, veränderbar sein, wobei zweckmäßig eine gesteuerte motorische Einstellung vorgesehen sein kann. Umfasst die Verstelleinrichtung beispielsweise eine oder mehrere Spannschrauben, so können diese z.B. mittels eines Elektromotors gesteuert angetrieben sein.The circumference of the mechanical compression element can in this case be variable by motor, in particular electrically, wherein expediently a controlled motor adjustment can be provided. If, for example, the adjusting device comprises one or more tightening screws, these may be e.g. be driven controlled by an electric motor.

Das mechanische Kompressionselement kann hierbei beispielsweise nach Art einer Schlauchschelle ausgebildet sein, welche den Außenumfang des stationären Behälterteils umgreift und mittels einer Verstelleinrichtung der vorgenannten Art unter Verkleinerung ihres Umfangs spannbar ist. Aus den weiter oben genannten Gründen kann eine solche Schlauchschelle insbesondere nachgiebig ausgebildet sein.The mechanical compression element may in this case be designed, for example, in the manner of a hose clamp, which surrounds the outer circumference of the stationary container part and can be tensioned by means of an adjusting device of the aforementioned type while reducing its circumference. For the reasons mentioned above, such a hose clamp can be designed in particular yielding.

Darüber hinaus ist es denkbar, dass das mechanische Kompressionselement nach Art einer Kette mit mehreren, relativ zueinander schwenkbaren Gliedern ausgebildet ist, wobei zumindest eine Schwenkachse der Kettenglieder zweckmäßig im Wesentlichen parallel zur Längsmittelachse des Behälters der Fliehkraft-Gleitschleifmaschine angeordnet sein sollte, damit sich ein jedes Kettenglied dem stationären Behälterteils von außen anzulegen vermag.In addition, it is conceivable that the mechanical compression element is designed in the manner of a chain with a plurality of relatively pivotable members, wherein at least one pivot axis of the chain links should be arranged substantially parallel to the longitudinal central axis of the container of the centrifugal vibratory finishing machine, so that each Chain link can create the stationary container part from the outside.

Statt dessen kann das mechanische Kompressionselement beispielsweise auch in Form von zwei gegeneinander verspannbaren Halbringen, vorzugsweise mit einer dem Außenumfang des stationären Behälterteils im Wesentlichen entsprechenden Innenkontur, ausgebildet sein, wobei die Halbringe z.B. jeweils etwa den halben Umfang des stationären Behälterteils umgreifen und ebenfalls nachgiebig oder auch im Wesentlichen starr ausgestaltet sein können. Eine Verstelleinrichtung der vorgenannten Art kann in diesem Fall dazu dienen, die Halbringe unter elastischer Verformung des stationären Behälterteils radial nach innen gegeneinander zu verspannen. In beiden Fällen kann das mechanische Kompressionselement z.B. aus Metall, wie Aluminium Stahlblech oder dergleichen, gefertigt sein. Eine entsprechende Ausgestaltung wäre alternativ selbstverständlich auch mit Drittel-, Viertelringen etc. denkbar.Instead, the mechanical compression element may, for example, also be in the form of two mutually bracing half rings, preferably with an inner contour substantially corresponding to the outer circumference of the stationary container part, the half rings being e.g. each encompass approximately half the circumference of the stationary container part and also may be designed to be flexible or substantially rigid. An adjustment of the aforementioned type can serve in this case to brace the half-rings under elastic deformation of the stationary container part radially inwardly against each other. In both cases, the mechanical compression element may e.g. be made of metal, such as aluminum sheet steel or the like. A corresponding embodiment would, of course, also conceivable with third, quarter rings etc. as an alternative.

Gemäß einer vorteilhaften Ausgestaltung kann ferner vorgesehen sein, dass das Kompressionselement in dem axialen Bereich des zwischen dem drehbaren Bodenteil und dem stationären Behälterteil gebildeten Spaltes angeordnet ist, so dass sich der zwischen dem stationären Behälterteil und dem drehbaren Bodenteil gebildete Ringspalt auf etwa demselben axialen Niveau befindet wie das Kompressionselement.According to an advantageous embodiment, it may further be provided that the compression element is arranged in the axial region of the gap formed between the rotatable bottom part and the stationary container part, so that the annular gap formed between the stationary container part and the rotatable bottom part is at approximately the same axial level like the compression element.

Das stationäre Behälterteil kann darüber hinaus ein Widerlager zum Anschlag gegen das Kompressionselement aufweisen, um es auf einfache Weise an einer geeigneten Position an dem stationären Behälterteil anbringen zu können, wie insbesondere im Bereich des axialen Niveaus des zwischen diesem und dem drehbaren Bodenteil gebildeten Spaltes.The stationary container part may moreover have an abutment for abutment against the compression element in order to be able to easily attach it to the stationary container part at a suitable position, in particular in the region of the axial level of the gap formed between it and the rotatable bottom part.

Um dem stationären Behälterteil zumindest in seinem von dem Kompressionselement umgriffenen Bereicht die erforderliche Elastizität zu verleihen, kann es beispielsweise zumindest in seinem von dem Kompressionselement umgriffenen Bereich oder selbstverständlich auch gänzlich aus Kunststoff, insbesondere aus Polyurethan, gefertigt sein. Indes kommen auch andere Materialien, wie Metall bzw. Metalllegierungen einschließlich Stahl, Aluminium oder dergleichen, in Betracht, wobei es dem Fachmann ohne weiteres, z.B. auf experimentellem Wege, möglich ist, die für das jeweilige Behältermaterial erforderliche Wandstärke des stationären Behälterteils zu ermitteln, welche bei dem Elastizitätsmodul des jeweils gewählten Behältermaterials die notwendige elastische Verformung, z.B. innerhalb der weiter oben erwähnten Spaltbreitenintervalle, desselben möglich macht.In order to impart the required elasticity to the stationary container part at least in its area embraced by the compression element, it can be made, for example, at least in its area encompassed by the compression element or of course entirely made of plastic, in particular polyurethane. However, other materials such as metal or metal alloys including steel, aluminum or the like are also contemplated and it will be readily apparent to those skilled in the art, e.g. By experimentally, it is possible to determine the wall thickness of the stationary container part required for the respective container material, which in the case of the modulus of elasticity of the respectively selected container material the necessary elastic deformation, e.g. within the gap width intervals mentioned above, it makes possible.

Wie eingangs angedeutet, bietet sich die Erfindung insbesondere - wenn auch nicht notwendigerweise - für solche Fliehkraft-Gleitschleifmaschinen an, bei welchen außenseitig des zwischen dem stationären Behälterteil und dem drehbaren Bodenteil gebildeten Spaltes ein mit dem Spalt korrespondierendes Reservoir zur Aufnahme eines flüssigen Bearbeitungshilfsmediums vorgesehen ist, um eine Nassbearbeitung von Werkstücken zu gewährleisten. Das flüssige Bearbeitungshilfsmedium kann in diesem Fall in als solcher bekannter Weise unter Druck aus dem Reservoir durch den Spalt hindurch ins Innere des Behälters überführbar sein.As indicated at the outset, the invention is particularly - although not necessarily - suitable for such centrifugal vibratory finishing machines, in which the outside of the gap formed between the stationary container part and the rotatable bottom part, a reservoir corresponding to the gap is provided for receiving a liquid processing auxiliary medium, to ensure a wet machining of workpieces. The liquid processing aid may in this case be known as such Way under pressure from the reservoir through the gap to be transferred into the interior of the container.

Darüber hinaus bietet sich die Erfindung insbesondere - wenn auch nicht notwendigerweise - für solche Fliehkraft-Gleitschleifmaschinen an, bei welchen außenseitig des zwischen dem stationären Behälterteil und dem drehbaren Bodenteil gebildeten Spaltes ein mit dem Spalt korrespondierender Ablauf zur Abführung eines - beispielsweise von oben in das stationäre Behälterteil zugesetzten - flüssigen Bearbeitungshilfsmediums vorgesehen ist, um gleichfalls eine Nassbearbeitung von Werkstücken zu ermöglichen.In addition, the invention is particularly - although not necessarily - for such centrifugal vibratory finishing machines on which the outside of the gap formed between the stationary container part and the rotatable bottom part a corresponding with the gap drain for discharging a - for example, from above into the stationary Container part added - liquid processing auxiliary medium is provided to also allow a wet machining of workpieces.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels unter Bezugnahme auf die Zeichnung. Dabei zeigt die einzige Figur:

  • eine Querschnittsansicht einer Ausführungsform einer erfindungsgemäßen Fliehkraft-Gleitschleifmaschine mit einer Einrichtung zur Verstellung der Breite des zwischen ihrem stationären Behälterteil und ihrem drehbaren Bodenteil gebildeten Ringspaltes.
Further features and advantages of the invention will become apparent from the following description of an embodiment with reference to the drawing. The only figure shows:
  • a cross-sectional view of an embodiment of a centrifugal vibratory finishing machine according to the invention with a device for adjusting the width of the annular gap formed between its stationary container part and its rotatable bottom part.

Die in der Zeichnung wiedergegebene Fliehkraft-Gleitschleifmaschine umfasst ein stationäres Behälterteil 1 sowie ein den Boden desselben bildendes, an einer zentralen, Welle 2 drehbar gelagertes Bodenteil 3, den sogenannten Teller, welches mittels eines nicht gezeigten Antriebsmotors in Rotation versetzbar ist. Das Bodenteil 3 bzw. der Teller ist z.B. etwa schalenförmig ausgebildet und weist ein mit einer verschleißfesten Innenbeschichtung 3b, z.B. aus Polyurethan, versehenes Tragteil 3a auf. Darüber hinaus kann das Bodenteil 3 mit sich nach innen bzw. oben erstreckenden Rippen oder Schaufeln 3c ausgestattet sein, um die Übertragung einer Drehbewegung desselben auf das Schleifgut zu verbessern. Das stationäre Behälterteil 1 kann seinerseits z.B. aus Polyurethan gefertigt oder gegebenenfalls eine entsprechende Innenbeschichtung besitzen (nicht dargestellt), wobei die Wandstärke des stationären Behälterteils 1 je nach seinem Material derart gewählt ist, dass es eine gewisse elastische Verformbarkeit aufweist, wobei insbesondere eine elastische Verformbarkeit der umfangs- bzw. mantelseitigen Wandung des Behälterteils 1 um zumindest etwa 1 mm oder mehr radial nach innen gewährleistet sein sollte.The reproduced in the drawing centrifugal vibratory finishing machine comprises a stationary container part 1 and a bottom of the same forming, rotatably mounted on a central shaft 2 bottom part 3, the so-called plate, which is displaceable by means of a drive motor, not shown in rotation. The bottom part 3 or the plate is, for example, approximately cup-shaped and has a carrying part 3a provided with a wear-resistant inner coating 3b, for example made of polyurethane. Furthermore For example, the bottom part 3 may be provided with inwardly extending ribs or blades 3c to enhance the transmission of rotational movement thereof to the material being grinded. The stationary container part 1, in turn, for example, made of polyurethane or optionally have a corresponding inner coating (not shown), wherein the wall thickness of the stationary container part 1 is chosen depending on its material such that it has a certain elastic deformability, in particular an elastic deformability of circumferential or shell-side wall of the container part 1 should be ensured by at least about 1 mm or more radially inward.

Das stationäre Behälterteil 1 weist ferner unmittelbar oberhalb des periphären Randes des Bodenteils 2 einen sich in Richtung des Bodenteils 2 hin verjüngenden Umfangsabschnitt 1a auf, um für eine gleichmäßige Förderung eines Bearbeitungsmediums in Form von Schleif- und/oder Poliergranulaten während des Betriebs, während dessen das Bodenteil 2 rotiert, entlang der Umfangswand des Behälterteils 1 nach oben zu sorgen, wobei das Granulat gemeinsam mit den zu bearbeitenden Werkstücken infolge Fliehkräften nach oben gefördert und noch in der Aufwärtsbewegung nicht unnötig abgebremst wird. Darüber hinaus ist ein oberer Abschnitt des Behälterteils 1 innenseitig mit Rippen 1b versehen, welche zu einer effektiveren Gleitschleifbearbeitung beitragen und sich im vorliegenden Fall etwa senkrecht in Axialrichtung des stationären Behälterteils 1 erstrecken. Indes sind solche Rippen 1b nicht zwingend erforderlich oder können diese je nach gewünschten Bearbeitungsergebnis auch andersartig ausgestaltet sein, wie beispielsweise entsprechend der DE 102 53 883 B3 .The stationary container part 1 also has immediately above the peripheral edge of the bottom part 2 in the direction of the bottom part 2 towards tapered peripheral portion 1 a, for a uniform promotion of a processing medium in the form of grinding and / or polishing granules during operation, during which Bottom part 2 rotates to provide along the peripheral wall of the container part 1 upwards, wherein the granules are promoted together with the workpieces to be machined due to centrifugal forces upwards and not unnecessarily braked in the upward movement. In addition, an upper portion of the container part 1 is provided on the inside with ribs 1b, which contribute to a more effective vibratory finishing and in the present case extend approximately perpendicularly in the axial direction of the stationary container part 1. However, such ribs 1b are not mandatory or they can be designed differently depending on the desired processing result, such as according to the DE 102 53 883 B3 ,

Zwischen dem Bodenteil 3 bzw. Teller und dem stationären Behälterteil 1 ist ein Spalt 4 in Form eines Ringspaltes gebildet, welcher z.B. eine Breite von etwa 0,5 mm besitzt und beim vorliegenden Ausführungsbeispiel bedarfsweise den Durchtritt eines flüssigen Bearbeitungshilfsmediums gestattet, welches sich in einem außenseitig des Spaltes 4 angeordneten und mit diesem korrespondierenden Reservoir 5 befindet. Über einen Anschlussstutzen 6 lässt sich das Reservoir 5 mit Druck beaufschlagen, um es durch den Spalt 4 hindurch ins Innere des Behälters überführen zu können. Alternativ kann ein entsprechendes flüssiges Bearbeitungsmedium dem stationären Behälterteil 1 z.B. auch über seine obere Öffnung zugesetzt und durch den Spalt 4 hindurch aus dem Behälter abgeführt werden, wobei der Anschlussstutzen 6 in diesem Fall zur Ableitung des flüssigen Bearbeitungshilfsmediums dienen kann.Between the bottom part 3 or plate and the stationary container part 1, a gap 4 is formed in the form of an annular gap, which is e.g. has a width of about 0.5 mm and in the present embodiment, if necessary, allows the passage of a liquid processing auxiliary medium, which is located in an outside of the gap 4 and with this corresponding reservoir 5. Via a connecting piece 6, the reservoir 5 can be pressurized in order to be able to transfer it through the gap 4 into the interior of the container. Alternatively, a corresponding liquid processing medium may be provided to the stationary container part 1 e.g. also added via its upper opening and be discharged through the gap 4 through from the container, the connecting piece 6 can serve in this case for the derivation of the liquid processing auxiliary medium.

Die Breite des ringförmigen Spaltes 4 ist mittels einer Einrichtung 10 zur Verstellung der Spaltbreite veränderbar, welche ein den Außenumfang des stationären Behälterteils 1 - im vorliegenden Fall im Wesentlichen vollständig - umgreifendes Kompressionselement 11 mit veränderbarem Umfang aufweist. Das Kompressionselement 11 liegt beim gezeigten Ausführungsbeispiel dem stationären Behälterteil 1 außenseitig im Wesentlichen vollständig an, um beim Verkleinern des Umfangs des Kompressionselementes 11 die mantelseitige Wandung des Behälterteils 1 vollumfänglich elastisch um denselben radialen Abstand nach innen zu verformen und folglich eine um den gesamten Umfang konstante Breite des Ringspaltes 4 zu sorgen. Es besitzt hierzu einen zu dem Auβenumfang des Behälterteils 1 etwa komplementären Innenumfang und ist insbesondere nachgiebig, beispielsweise elastisch, ausgebildet, um sich dem Außenumfang des Behälterteils 1 anpassen zu können. Der Umfang des Kompressionselementes kann insbesondere mechanisch, wie mittels einer oder mehrerer Stellschrauben (nicht dargestellt), veränderbar sein, wobei das Kompressionselement 11 beispielsweise nach Art einer etwa bandförmigen Schlauchschelle, z.B. aus Aluminium, Stahlblech etc., ausgestaltet sein kann.The width of the annular gap 4 is variable by means of a device 10 for adjusting the gap width, which has a the periphery of the stationary container part 1 - in the present case substantially completely - embracing compression element 11 with variable circumference. The compression element 11 is in the embodiment shown, the stationary container part 1 on the outside substantially completely to deform the circumference of the compression member 11, the shell-side wall of the container part 1 fully elastically by the same radial distance inwards and thus a constant width around the entire circumference of the annular gap 4. For this purpose, it has an inner circumference which is approximately complementary to the outer circumference of the container part 1 and is, in particular, yielding, for example elastic, in order to form the outer circumference of the container part 1 to adapt. The circumference of the compression element may in particular be mechanically, as by means of one or more screws (not shown), changeable, wherein the compression element 11, for example in the manner of a band-shaped hose clamp, for example, aluminum, steel sheet, etc., may be configured.

Das Kompressionselement 11 ist auf einem axialen Niveau des stationären Behälterteils 1 um dessen Umfang verspannt, auf welchem sich auch der zwischen dem Behälterteil 1 und dem Bodenteil 3 vorhandene, ringförmige Spalt 4 befindet, wobei der Spalt 4 beim vorliegenden Ausführungsbeispiel etwa in der Mitte der in Axialrichtung betrachteten Breite B des Kompressionselementes 11 angeordnet ist. Ein zum Anschlag gegen die in der Zeichnung untere Stirnseite des Kompressionselementes 11 dienendes Widerlager ist außenseitig der umfänglichen Wandung des stationären Behälterteils 1 in Form einer umfänglichen Stufe gebildet, so dass ein einfaches und schnelles Anbringen des Kompressionselementes 11 an dem Behälterteil 1 an der geeigneten Position möglich ist.The compression element 11 is clamped on an axial level of the stationary container part 1 around its circumference, on which also the present between the container part 1 and the bottom part 3, annular gap 4 is located, wherein the gap 4 in the present embodiment, approximately in the middle of in Axially direction considered width B of the compression element 11 is arranged. An abutment against the lower end face of the compression element 11 serving in the drawing is formed on the outside of the circumferential wall of the stationary container part 1 in the form of a circumferential step, so that a simple and quick attachment of the compression element 11 to the container part 1 at the appropriate position possible is.

Die gezeigte Einrichtung 10 zur Verstellung der Spaltbreite mit dem Kompressionselement 11 sorgt somit beim mechanischen Komprimieren bzw. Festziehen des Kompressionselementes 11 für eine elastische Verformung der umfänglichen Wandung des stationären Behälterteils 1 im Bereich des Spaltes 4 radial nach innen, wodurch die Spaltbreite bis hin zu einem praktisch gänzlichen Verschließen des Spaltes verringert werden kann. Aufgrund der Elastizität des Behältermaterials ist dieser Vorgang reversibel, d.h. im Falle eines Lösend des Kompressionselementes 11 weitet sich das stationäre Behälterteils 1 wieder unter Vergrößerung des Spaltes 4 radial nach außen auf.The illustrated device 10 for adjusting the gap width with the compression element 11 thus ensures the mechanical compression or tightening of the compression element 11 for elastic deformation of the circumferential wall of the stationary container part 1 in the region of the gap 4 radially inwardly, whereby the gap width up to a practically complete closure of the gap can be reduced. Due to the elasticity of the container material, this process is reversible, ie in the case of a loosening of the compression element 11 widens the stationary Container part 1 again under enlargement of the gap 4 radially outward.

Claims (19)

  1. A centrifugal finishing machine with a stationary container part (1) and a bottom part (3) forming the floor of the stationary container part (1), which bottom part is rotatably mounted and is displaceable in rotation by means a drive, wherein a gap is formed (4) between the bottom part (3) and the stationary container part (1), the width of which gap is variable by means of a device (10) for adjusting the gap width, characterised in that the device (10) for adjusting the gap width comprises a compression element (11) of variable circumference encompassing at least one section of the outer circumference of the stationary container part (1), and in that the wall thickness and/or the material of the stationary container part (1) is selected, at least in the region encompassed by the compression element (11), so that its cross-section is reversibly reducible by compressing the compression element (11).
  2. The centrifugal finishing machine according to Claim 1, characterised in that the gap width is variable within a range of between approx. 0.1 mm and approx. 1 mm, and in particular between approx. 0.1 mm and approx. 0.5 mm.
  3. The centrifugal finishing machine according to Claim 1 or 2, characterised in that the compression element (11) encompasses the stationary container part (1) by a circumferential section of at least 75%, in particularly by at least 90% and preferably essentially fully encompasses it.
  4. The centrifugal finishing machine according to any one of Claims 1 to 3, characterised in that the compression element (11), in its region encompassing the stationary container part (1), lies essentially fully flush with the stationary container part (1).
  5. The centrifugal finishing machine according to any one of Claims 1 to 4, characterised in that the compression element (11) has an inner circumference that is essentially complementary to the outer circumference of the stationary container part (1).
  6. The centrifugal finishing machine according to any one of Claims 1 to 5, characterised in that the compression element (1) is flexible so that it can be adapted to the outer circumference of the stationary container part (1).
  7. The centrifugal finishing machine according to any one of Claims 1 to 6, characterised in that the circumference of the compression element (11) is hydraulically, pneumatically and/or hydropneumatically variable.
  8. The centrifugal finishing machine according to Claim 7, characterised in that the hydraulic, pneumatic and/or hydropneumatic compression element is designed in the form of a hose encompassing the stationary container part (1), which hose can be loaded with fluid pressure.
  9. The centrifugal finishing machine according to any one of Claims 1 to 6, characterised in that the circumference of the compression element (11) is mechanically variable, in particular by means of a mechanical adjusting device, such as at least one screw.
  10. The centrifugal finishing machine according to Claim 9, characterised in that the circumference of the mechanical compression element (11) is adjustable by means of a motor, in particular an electric motor.
  11. The centrifugal finishing machine according to Claim 9 or 10, characterised in that the mechanical compression element (11) is designed in the nature of a hose clip.
  12. The centrifugal finishing machine according to Claim 9 or 10, characterised in that the mechanical compression element is designed in the nature of a chain with a plurality of links that can be swivelled relative to each other.
  13. The centrifugal finishing machine according to Claim 9 or 10, characterised in that the mechanical compression unit is designed in the form of two half-rings that can be clamped together.
  14. The centrifugal finishing machine according to any one of Claims 1 to 13, characterised in that the compression element (11) is arranged in the axial region of the gap (4) formed between the rotary bottom part (2) and the stationary container part (3).
  15. The centrifugal finishing machine according to any one of Claims 1 to 14, characterised in that the stationary container part (1) has a thrust bearing (7) to provide a stop against the compression element (11).
  16. The centrifugal finishing machine according to any one of Claims 1 to 15, characterised in that the stationary container part (1) is manufactured from plastic, in particular of polyurethane, at least in its region encompassed by the compression element (11).
  17. The centrifugal finishing machine according to any one of Claims 1 to 16, characterised in that a reservoir (5) corresponding to the gap (4) is provided for receiving a liquid processing aid medium on the outside of the gap (4) formed between the stationary container part (1) and the rotary bottom part (3).
  18. The centrifugal finishing machine according to Claim 17, characterised in that the liquid processing aid medium can be transferred to the inside of the container through the gap (4) under pressure from the reservoir (5).
  19. The centrifugal finishing machine according to any one of Claims 1 to 16, characterised in that a drain corresponding to the gap (4) is provided for discharging a liquid processing aid medium on the outside of the gap (4) formed between the stationary container part (1) and the rotary bottom part (3).
EP10002935A 2009-03-25 2010-03-19 Centrifugal force grinding machine with a device for setting the gap width Not-in-force EP2239096B1 (en)

Applications Claiming Priority (2)

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DE202009004011 2009-03-25
DE202009004268U DE202009004268U1 (en) 2009-03-31 2009-03-31 Centrifugal vibratory finishing machine with a device for adjusting the gap width

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EP2239096A1 EP2239096A1 (en) 2010-10-13
EP2239096B1 true EP2239096B1 (en) 2012-01-04

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20110851A1 (en) * 2011-05-16 2012-11-17 Paolo Redaelli "FINISHING MACHINE FOR DRIVING AND RELATIVE METHOD"
CN107614198B (en) * 2015-05-18 2020-01-31 安百拓凿岩钎具有限公司 Method for treating toughness and hardness of drill bit buttons
CN113547443A (en) * 2021-08-04 2021-10-26 宁夏恒钛科技有限公司 Particle grinding processing device based on micro-channel reactor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3802542C1 (en) 1988-01-28 1989-08-24 Max Spaleck Gmbh & Co Kg, 4290 Bocholt, De
DE4311689C2 (en) 1993-04-08 1997-02-13 Roesler Roland Oberflaechen Centrifugal vibratory grinding machine with gap adjustment
JP3062800B2 (en) 1996-02-26 2000-07-12 株式会社チップトン Eddy barrel processing machine
JP2913473B2 (en) * 1997-01-31 1999-06-28 株式会社チップトン Eddy current barrel processing machine having gap adjusting function, method for forming escape layer, and gap adjusting method
DE19843366B4 (en) * 1998-09-22 2005-07-21 Helmut Gegenheimer Centrifugal vibratory finishing machine with gap adjustment
DE10253883B4 (en) 2002-11-11 2006-09-21 Hydraulik-Ring Gmbh Adjustment device for camshafts, in particular of motor vehicles

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EP2239096A1 (en) 2010-10-13

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