EP0297551B1 - Machine for grinding big balls - Google Patents
Machine for grinding big balls Download PDFInfo
- Publication number
- EP0297551B1 EP0297551B1 EP88110392A EP88110392A EP0297551B1 EP 0297551 B1 EP0297551 B1 EP 0297551B1 EP 88110392 A EP88110392 A EP 88110392A EP 88110392 A EP88110392 A EP 88110392A EP 0297551 B1 EP0297551 B1 EP 0297551B1
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- European Patent Office
- Prior art keywords
- grinding
- grinding tool
- machine
- rollers
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- B24B11/00—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor
- B24B11/02—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls
- B24B11/04—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls involving grinding wheels
- B24B11/10—Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor for grinding balls involving grinding wheels of cup type
Definitions
- the invention relates to a machine for grinding large balls, in particular made of natural or artificial stone, of the type specified in the preambles of claims 1 and 2.
- a machine for grinding large balls of the specified types is known from US Pat. No. 2,998,676 and has a perpendicular one above it Rolling bodies, of which at least one is driven, mounted spherical blank arranged on a cup-shaped grinding tool.
- the required grinding pressure between the blank ball and the grinding tool is generated by a weight, the grinding tool being attached to a pivotable lever arm.
- a disadvantage of such a machine is the complex construction, since the exchangeable grinding wheel, which serves as a grinding tool, has to be displaced parallel to the two rolling elements for the ball blank by means of an adjusting mechanism; the grinding wheel must be guided with high accuracy, but at the same time compensate for the fluctuations in the diameter of the ball blank which cannot be avoided in practice. With relatively small objects, such as balls for ball bearings, this is not a problem.
- grinding balls made of natural or artificial stone with a diameter of 1 to 3 m with the desired precision in the order of magnitude of 100th mm is not readily possible with the known machine.
- the invention is therefore based on the object of providing a machine for grinding large balls of the specified types, with which even large balls with a diameter of up to 3 m can be ground very precisely without any problems.
- the advantages achieved with the present invention are based on the generation of the force required for the contact pressure by means of a type of balance beam, which has the rollers for the movement of the ball blank or the grinding tool at one end and the device for generating the grinding pressure between at the other end the ball blank and the grinding tool or a device partially compensating for the weight of the grinding tool, in particular a counterweight, which can be adapted to the weight of the ball blank or the grinding tool.
- the grinding tool in the embodiment according to claim 1 or the rollers in the embodiment according to claim 2 are each arranged in a stationary manner, so that this results in a very simple construction. Since only two castors can be driven, while the third is designed as a swivel castor that can be swiveled about an axis skewed to its axis of rotation and is not driven, there are relatively few moving parts, especially since the beam-like frame is in an unstable equilibrium state in the actual grinding state no further movements occur here.
- the three rollers mentioned are sufficient for stable storage of the ball blank.
- the direction of movement of the ball blank can be changed by temporarily changing the drive speed of one of the two driven rollers, so that the desired grinding effect also results on the entire surface of the ball blank.
- Chains or ropes that have the required mechanical strength can be used as connecting elements.
- the beam-like frame is freely movable on the machine frame, it can perform horizontal movements practically without resistance, which are caused by unevenness in the surface of the ball blank to be ground, which also contributes to the desired accuracy of the grinding process.
- the machine for grinding large balls indicated generally by reference number 10, stands on a foundation 12 and has four supports 14, 16, 18 and 20 (only the two front supports 14, 16 are shown in the side views according to FIGS. 1 and 3), which are combined in pairs and carry a horizontal cross bar 22.
- the supports 14, 16 on the one hand and 18, 20 on the other are connected to each other and to the horizontal crossbeam 22, so that there is a stable construction.
- Flexible connecting elements 24 in the form of two chains are suspended from the horizontal cross bar 22, which jointly carry a support 26 which is formed as a rectangular frame in plan view.
- This carrier 26 has two parallel bars 28, 30, which are connected at their ends by transverse webs 32, 34, so that there is a stable structure.
- a device 36 for generating the grinding pressure acts in the form of a counterweight, while three rollers 38, 40, 42 are mounted on the other end of the carrier 26.
- the three rollers 38, 40, 42 are located at the corners of an isosceles triangle, i.e. the roller 38 is arranged approximately in the middle of the transverse web 32, while the other two rollers 40, 42 are located on the two beams 28, 30, and in each case at the same distance from the roller 38.
- the roller 38 While one of the two is driven by the two rollers 40, 42, the roller 38 is freely rotatable and pivotable about an axis lying obliquely to its axis of rotation and serves as a steering roller.
- a ball blank 44 is placed, the weight of which is less than the weight of the counterweight generating the grinding pressure, so that the ball blank 44 is pressed upwards by means of the carrier 26 against a bowl-shaped grinding tool 46 with a central opening 48 becomes.
- Abrasive is fed through the central opening 48 of the grinding tool 46, in which the ball blank 44 is arranged in the center.
- the counterweight thus serves on the one hand to balance the weight of the ball blank 44 and the rollers 38, 40, 42 with their holders and, moreover, to generate the force with which the ball blank 44 is pressed against the grinding tool 46.
- the Bearing of the grinding tool 46 is indicated in FIG. 2 by the two carriers 50, 52.
- the ball blank 44, on the one hand, and the counterweight 36, on the other hand, are placed on the carrier 26, wherein, as explained, the counterweight exceeds the weight of the ball blank 44 and that of the roller arrangement to such an extent that the desired pressing force is generated.
- one of the two rollers 40, 42 is rotated more slowly or faster from time to time, as a result of which the ball blank 44 has a different direction of rotation and rotational speed.
- the required grinding pressure can be set by changing the counterweight, i.e. Even during the grinding process of a ball blank 44, the grinding pressure can be changed by changing the counterweight.
- the position of the ball blank 44 immediately adapts to any horizontal movements that arise from unevenness in the surface of the ball blank 44.
- FIG. 3 shows, in a representation corresponding to FIG. 1, a side view of another embodiment of the machine for grinding large balls, in which the rollers 38, 40, 42 are arranged stationary on the foundation 12, while the grinding tool 46 rests on the end of the carrier 26 .
- the counterweight is chosen so that the desired contact pressure between ball blank 44 and grinding tool 46 results.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Disintegrating Or Milling (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
Die Erfindung betrifft eine Maschine zum Schleifen großer Kugeln, insbesondere aus Natur- oder Kunst-Stein, der in den Oberbegriffen der Ansprüche 1 und 2 angegebenen Gattung.The invention relates to a machine for grinding large balls, in particular made of natural or artificial stone, of the type specified in the preambles of claims 1 and 2.
Während für das Schleifen relativ kleiner Kugeln mit einem Durchmesser von einigen Millimetern bis einigen Zentimetern verschiedene Techniken zur Verfügung stehen, bietet das Schleifen großer Kugeln, insbesondere aus Natur- oder Kunst-Stein nach wie vor große Schwierigkeiten. Dabei wird beispielsweise an eine Granit-Kugel mit einem Durchmesser von etwa 10 cm bis zu 3 m gedacht, wie sie für sogenannte "schwimmende Kugeln" benötigt werden, also eine große, mittels eines Flüssigkeits-, insbesondere Wasser-Films, in einer Schale gelagerte Kugel, die durch den hydrostatischen Wasserdruck angehoben wird und sich wegen der extrem geringen Reibungskräfte zwischen Schale und Kugel sehr leicht dreht.While various techniques are available for grinding relatively small balls with a diameter of a few millimeters to a few centimeters, grinding large balls, in particular made of natural or artificial stone, continues to present great difficulties. Here, for example, a granite ball with a diameter of approximately 10 cm to 3 m is considered, as is required for so-called "floating balls", that is to say a large one, which is stored in a shell by means of a liquid, in particular water film Ball that is raised by the hydrostatic water pressure and rotates very easily due to the extremely low frictional forces between the bowl and ball.
Eine Maschine zum Schleifen großer Kugeln der angegebenen Gattungen ist aus der US-PS 2 998 676 bekannt und weist ein lotrecht über dem auf Wälzkörpern, von denen mindestens einer angetrieben ist, gelagerten Kugel-Rohling angeordnetes schalenförmiges Schleifwerkzeug auf. Der erforderliche Schleifdruck zwischen dem Kugel-Rohling und dem Schleifwerkzeug wird durch ein Gewicht erzeugt, wobei das Schleifwerkzeug an einem schwenkbaren Hebelarm befestigt ist.A machine for grinding large balls of the specified types is known from US Pat. No. 2,998,676 and has a perpendicular one above it Rolling bodies, of which at least one is driven, mounted spherical blank arranged on a cup-shaped grinding tool. The required grinding pressure between the blank ball and the grinding tool is generated by a weight, the grinding tool being attached to a pivotable lever arm.
Nachteilig ist bei einer solchen Maschine die aufwendige Konstruktion, da die auswechselbare, als Schleifwerkzeug dienende Schleifscheibe mittels eines Verstellmechanismus parallel zu den beiden Wälzkörpern für den Kugel-Rohling verschoben werden muß; die Führung der Schleifscheibe muß mit hoher Genauigkeit erfolgen, gleichzeitig jedoch die in der Praxis nicht zu vermeidenden Schwankungen in dem Durchmesser des Kugel-Rohlings ausgleichen. Bei relativ kleinen Objekten, wie beispielsweise Kugeln für Kugellager, bereitet dies keine Schwierigkeiten. Das Schleifen von Kugeln aus Natur- oder Kunststein mit einem Durchmesser von 1 bis 3 m mit der gewünschten Präzision in der Größenordnung von 100stel mm ist jedoch mit der bekannten Maschine nicht ohne weiteres möglich.A disadvantage of such a machine is the complex construction, since the exchangeable grinding wheel, which serves as a grinding tool, has to be displaced parallel to the two rolling elements for the ball blank by means of an adjusting mechanism; the grinding wheel must be guided with high accuracy, but at the same time compensate for the fluctuations in the diameter of the ball blank which cannot be avoided in practice. With relatively small objects, such as balls for ball bearings, this is not a problem. However, grinding balls made of natural or artificial stone with a diameter of 1 to 3 m with the desired precision in the order of magnitude of 100th mm is not readily possible with the known machine.
Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Maschine zum Schleifen großer Kugeln der angegebenen Gattungen zu schaffen, mit der auch große Kugeln mit einem Durchmesser von bis zu 3 m problemlos sehr exakt geschliffen werden können.The invention is therefore based on the object of providing a machine for grinding large balls of the specified types, with which even large balls with a diameter of up to 3 m can be ground very precisely without any problems.
Diese Aufgabe wird erfindungsgemäß durch die in den kennzeichnenden Teilen der Ansprüche 1 und 2 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing parts of claims 1 and 2.
Zweckmäßige Ausführungsformen werden durch die Merkmale der Unteransprüche definiert.Expedient embodiments are defined by the features of the subclaims.
Zwar geht bereits aus der US-PS 37 39 531 eine Maschine zum Schleifen großer Kugeln aus Naturstein hervor, bei der der Kugel-Rohling in einem rotierenden, tassenförmigen Aufnahmebehälter angeordnet und durch Schenkel eines Auslegers um eine horizontale Achse gedreht wird. Der Kugel-Rohling wird dabei im Kontakt mit den Kanten des sich drehenden Aufnahmebehälters mittels des Schleifmittels abgeschliffen, das von einer automatischen Zuführvorrichtung auf den Kugel-Rohling aufgebracht wird. Die Schenkel des Auslegers berühren den Kugel-Rohling auf jeder Seite der vertikalen Achse des tassenförmigen Aufnahmebehälters, um auf diese Weise den Kugel-Rohling in dem Aufnahmebehälter zu halten. Es sind weder drehbare Rollen noch ein frei beweglich am Maschinengestell aufgehängter waagebalkenartiger Rahmen vorgesehen.A machine for grinding large balls made of natural stone already emerges from US Pat. No. 3,739,531, in which the ball blank is arranged in a rotating, cup-shaped receptacle and is rotated about a horizontal axis by legs of a cantilever. The blank ball is abraded in contact with the edges of the rotating receptacle by means of the abrasive which an automatic feed device is applied to the blank ball. The arms of the cantilever touch the blank ball on either side of the vertical axis of the cup-shaped receptacle, so as to hold the blank ball in the receptacle. There are neither rotatable rollers nor a freely movable frame-like frame suspended from the machine frame.
Die mit der vorliegenden Erfindung erzielten Vorteile beruhen auf der Erzeugung der für den Anpreßdruck erforderlichen Kraft mittels einer Art Waagebalken, der an einem Ende die Rollen für die Bewegung des Kugel-Rohlings bzw. das Schleifwerkzeug und am anderen Ende die Einrichtung zur Erzeugung des Schleifdruckes zwischen dem Kugel-Rohling und dem Schleifwerkzeug bzw. eine das Gewicht des Schleifwerkzeugs teilweise kompensierende Einrichtung, insbesondere ein Gegengewicht, trägt, das an das Gewicht des Kugel-Rohlings bzw. des Schleifwerkzeuges angepaßt werden kann.The advantages achieved with the present invention are based on the generation of the force required for the contact pressure by means of a type of balance beam, which has the rollers for the movement of the ball blank or the grinding tool at one end and the device for generating the grinding pressure between at the other end the ball blank and the grinding tool or a device partially compensating for the weight of the grinding tool, in particular a counterweight, which can be adapted to the weight of the ball blank or the grinding tool.
Das Schleifwerkzeug bei der Ausführungsform nach Anspruch 1 oder die Rollen bei der Ausführungsform nach Anspruch 2 sind jeweils stationär angeordnet, so daß sich insofern ein sehr einfacher Aufbau ergibt. Da nur zwei Rollen angetrieben werden können, während die dritte als um eine zu ihrer Drehachse windschiefe Achse schwenkbare Lenkrolle ausgebildet und nicht angetrieben ist, gibt es nur relativ wenige bewegliche Teile, zumal sich im eigentlichen Schleifzustand der waagebalkenartige Rahmen in einem labilen Gleichgewichtszustand befindet, also hier ansich keine weiteren Bewegungen auftreten. Zur stabilen Lagerung des Kugel-Rohlings reichen die erwähnten drei Rollen aus.The grinding tool in the embodiment according to claim 1 or the rollers in the embodiment according to claim 2 are each arranged in a stationary manner, so that this results in a very simple construction. Since only two castors can be driven, while the third is designed as a swivel castor that can be swiveled about an axis skewed to its axis of rotation and is not driven, there are relatively few moving parts, especially since the beam-like frame is in an unstable equilibrium state in the actual grinding state no further movements occur here. The three rollers mentioned are sufficient for stable storage of the ball blank.
Durch zeitweilige Änderung der Antriebsgeschwindigkeit einer der beiden angetriebenen Rollen kann die Bewegungsrichtung des Kugel-Rohlings geändert werden, so daß sich die gewünschte Schleifwirkung auch auf der gesamten Oberfläche des Kugel-Rohlings ergibt.The direction of movement of the ball blank can be changed by temporarily changing the drive speed of one of the two driven rollers, so that the desired grinding effect also results on the entire surface of the ball blank.
Versuche haben gezeigt, daß sich auf diese Weise Kugeln mit einem Durchmesser von bis zu 1,2 m mit einer Genauigkeit von einigen 100stel mm schleifen lassen.Experiments have shown that balls with a diameter of up to 1.2 m can be ground with an accuracy of a few 100ths of a mm.
Als Verbindungselemente können Ketten oder Seile verwendet werden, die die erforderliche mechanische Festigkeit haben.Chains or ropes that have the required mechanical strength can be used as connecting elements.
Da der waagebalkenartige Rahmen frei beweglich am Maschinengestell aufgehängt ist, kann er praktisch widerstandslos horizontale Bewegungen ausführen, die durch Unebenheiten in der Oberfläche des zu schleifenden Kugel-Rohlings verursacht werden, was ebenfalls zur gewünschten Genauigkeit des Schleifvorgangs beiträgt.Since the beam-like frame is freely movable on the machine frame, it can perform horizontal movements practically without resistance, which are caused by unevenness in the surface of the ball blank to be ground, which also contributes to the desired accuracy of the grinding process.
Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels unter Bezugnahme auf die beiliegenden schematischen Zeichnungen näher erläutert. Es zeigen
- Fig. 1
- eine Seitenansicht einer ersten Ausführungsform einer Maschine zum Schleifen einer großen Kugel aus Natur- oder Kunst-Stein,
- Fig. 2
- einen Grundriß dieser Maschine, und
- Fig. 3
- eine Seitenansicht einer weiteren Ausführungsform einer Maschine zum Schleifen einer großen Kugel aus Natur- oder Kunst-Stein.
- Fig. 1
- a side view of a first embodiment of a machine for grinding a large ball made of natural or artificial stone,
- Fig. 2
- a layout of this machine, and
- Fig. 3
- a side view of another embodiment of a machine for grinding a large ball made of natural or artificial stone.
Die allgemein durch das Bezugszeichen 10 angedeutete Maschine zum Schleifen großer Kugeln steht auf einem Fundament 12 und weist vier Stützen 14, 16, 18 und 20 (in den Seitenansichten nach Figur 1 und 3 sind nur die beiden vorderen Stützen 14, 16 dargestellt) auf, die jeweils paarweise zusammengefaßt sind und einen horizontalen Querbalken 22 tragen. Die Stützen 14, 16 einerseits und 18, 20 andererseits sind miteinander und mit dem horizontalen Querbalken 22 verbunden, so daß sich eine stabile Konstruktion ergibt.The machine for grinding large balls, indicated generally by
An dem horizontalen Querbalken 22 sind flexible Verbindungselemente 24 in Form zweier Ketten aufgehängt, die gemeinsam einen in der Draufsicht als rechteckiger Rahmen ausgebildeten Träger 26 tragen. Dieser Träger 26 weist zwei parallel zueinander verlaufende Balken 28, 30 auf, die an ihren Enden durch Querstege 32, 34 miteinander verbunden sind, so daß sich ein stabiler Aufbau ergibt.Flexible connecting
An einem Ende des Trägers 26, gemäß der Ansicht nach Figur 1 auf dem rechten Ende, greift eine Einrichtung 36 zur Erzeugung des Schleifdrucks in Form eines Gegengewichts an, während auf dem anderen Ende des Trägers 26 drei Rollen 38, 40, 42 gelagert sind. Die drei Rollen 38, 40, 42 befinden sich an den Ecken eines gleichschenkligen Dreieckes, d.h. die Rolle 38 ist etwa in der Mitte des Quersteges 32 angeordnet, während sich die beiden anderen Rollen 40, 42 auf den beiden Balken 28, 30 befinden und zwar in jeweils gleichem Abstand von der Rolle 38.At one end of the
Während von den beiden Rollen 40, 42 eine der beiden angetrieben ist, ist die Rolle 38 frei drehbar, sowie um eine windschief zu ihrer Drehachse liegende Achse schwenkbar und dient als Lenkrolle.While one of the two is driven by the two
Auf die drei Rollen 38, 40, 42 wird ein Kugelrohling 44 aufgelegt, dessen Gewicht kleiner als das Gewicht des den Schleifdruck erzeugenden Gegengewichtes ist, so daß der Kugelrohling 44 mittels des Trägers 26 nach oben gegen ein schalenförmiges Schleifwerkzeug 46 mit einer zentralen Öffnung 48 gedrückt wird. Durch die zentrale Öffnung 48 des Schleifwerkzeugs 46, in der der Kugelrohling 44 mittig angeordnet ist, wird Schleifmittel zugeführt.On the three
Das Gegengewicht dient also einerseits zum Ausgleich des Gewichtes des Kugelrohlings 44 sowie der Rollen 38, 40, 42 mit ihren Halterungen und darüberhinaus zur Erzeugung der Kraft, mit der der Kugelrohling 44 gegen das Schleifwerkzeug 46 gedrückt wird. Die Lagerung des Schleifwerkzeugs 46 ist in Figur 2 durch die beiden Träger 50, 52 angedeutet.The counterweight thus serves on the one hand to balance the weight of the ball blank 44 and the
Zum Schleifen eines Kugelrohlings werden der Kugelrohling 44 einerseits und das Gegengewicht 36 andererseits auf den Träger 26 aufgelegt, wobei, wie erläutert, das Gegengewicht das Gewicht des Kugelrohlings 44 und das der Rollenanordnung soweit übersteigt, daß die gewünschte Andruckkraft erzeugt wird.For grinding a ball blank, the ball blank 44, on the one hand, and the
Nun werden die beiden Rollen 40, 42 in Drehbewegung gesetzt, so daß sich auch der Kugelrohling 44 dreht. Aufgrund der Verwendung der drei Rollen 38, 40, 42 ergibt sich eine stabile Lage des Kugelrohlings 44, der mit dem gewünschten Druck gegen das Schleifwerkzeug 46 gepreßt und gleichzeitig gedreht wird.Now the two
Damit die gesamte Oberfläche des Kugelrohlings 44 geschliffen werden kann, wird von Zeit zu Zeit eine der beiden Rollen 40, 42 langsamer oder schneller gedreht, wodurch der Kugelrohling 44 eine andere Drehrichtung und Drehgeschwindigkeit bekommt.So that the entire surface of the ball blank 44 can be ground, one of the two
Der erforderliche Schleifdruck kann durch Änderung des Gegengewichtes eingestellt werden, d.h. auch während des Schleifvorgangs eines Kugelrohlings 44 läßt sich der Schleifdruck verändern, indem das Gegengewicht verändert wird.The required grinding pressure can be set by changing the counterweight, i.e. Even during the grinding process of a ball blank 44, the grinding pressure can be changed by changing the counterweight.
Durch die Aufhängung des Trägers 26 an den Ketten - oder als Alternative hierzu an Seilen - paßt sich die Lage des Kugelrohlings 44 sofort irgendwelchen horizontalen Bewegungen an, die durch Unebenheiten in der Oberfläche des Kugelrohlings 44 entstehen.By suspending the
Die Figur 3 zeigt in einer Figur 1 entsprechenden Darstellung eine Seitenansicht einer anderen Ausführungsform der Maschine zum Schleifen großer Kugeln, bei der die Rollen 38, 40, 42 stationär auf dem Fundament 12 angeordnet sind, während das Schleifwerkzeug 46 auf dem Ende des Trägers 26 aufliegt. Das Gegengewicht wird so gewählt, daß sich die gewünschte Andruckkraft zwischen Kugelrohling 44 und Schleifwerkzeug 46 ergibt.FIG. 3 shows, in a representation corresponding to FIG. 1, a side view of another embodiment of the machine for grinding large balls, in which the
Claims (8)
- A machine (10) for grinding large balls, in particular of natural or artificial stone, comprising a dish-shaped grinding tool (46) which is disposed vertically above the ball blank (44) mounted on rolling bodies, at least one of which is driven, and a means (36) for producing the grinding pressure between the ball blank (44) and the grinding tool (46), characterized in that as rolling bodies three rollers (38, 40, 42) are used, one of which (38) is constructed as guiding roller pivotable about an axis askew with respect to its axis of rotation, that the rollers (38, 40, 42) are disposed on a support (26) mounted freely movably on the machine frame (14, 16, 18, 20, 22) via flexible connecting elements (24) , and that the means (36) for generating the grinding pressure engages said support (26).
- A machine (10) for grinding large balls, in particular of natural or artificial stone, comprising a dish-shaped grinding tool (46) which is disposed vertically above the ball blank (44) mounted on stationarily disposed rolling bodies, at least one of which is driven, and a means (36) for producing the grinding pressure between the ball blank (44) and the grinding tool (46), characterized in that as rolling bodies three rollers (38, 40, 42) are used, one of which (38) is constructed as a guide roller pivotable about an axis askew with respect to its axis of rotation, that the dish-shaped grinding tool (46) is attached freely movably on the machine frame (14, 16, 18, 20, 22) via flexible connecting elements (24), and that the grinding tool (46) engages the means (36) for compensating the weight of the grinding tool (46) so that the desired grinding pressure results.
- A machine according to claim 1, characterized in that the support is formed by a balance-beam-like frame (26) suspended freely movably on the machine frame (14, 16, 18, 20, 22).
- A machine according to one of the claims 1 to 3, characterized in that the connecting elements (24) are chains, cables or ropes.
- A machine according to one of the claims 1 to 4, characterized in that the guiding roller (38) has the same distance from each of the two other rollers (40, 42).
- A machine according to one of the claims 1 to 5, characterized in that with a plurality of driven rollers (40, 42) these are adapted to be driven at times with different speed.
- A machine according to one of the claims 1 to 6, characterized in that the means (36) are formed by weights (36).
- A machine according to one of the claims 1 to 7, characterized in that a balance-beam-like frame (26) is suspended freely movably on the machine frame (14, 16, 18, 20, 22) via flexible connecting elements (24) and that at one end of the balance-beam-like frame (26) the grinding tool (46) is disposed and at the other end of the frame (26) the means (36) partially compensating the weight of the grinding tool (46) is disposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88110392T ATE66173T1 (en) | 1987-06-30 | 1988-06-29 | MACHINE FOR GRINDING LARGE BALLS. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3721592 | 1987-06-30 | ||
| DE3721592A DE3721592C1 (en) | 1987-06-30 | 1987-06-30 | Machine for grinding large balls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0297551A1 EP0297551A1 (en) | 1989-01-04 |
| EP0297551B1 true EP0297551B1 (en) | 1991-08-14 |
Family
ID=6330593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88110392A Expired - Lifetime EP0297551B1 (en) | 1987-06-30 | 1988-06-29 | Machine for grinding big balls |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4856231A (en) |
| EP (1) | EP0297551B1 (en) |
| AT (1) | ATE66173T1 (en) |
| DE (1) | DE3721592C1 (en) |
| ES (1) | ES2025248B3 (en) |
| GR (1) | GR3002959T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6402600B1 (en) | 2000-10-30 | 2002-06-11 | Othmar C. Besch | Bowling ball surface abrading and polishing tool assembly |
| CN112318276A (en) * | 2020-10-23 | 2021-02-05 | 胡志军 | Decorate with circular red stone ball equipment of polishing |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US998101A (en) * | 1910-10-24 | 1911-07-18 | Max A Laabs | Machine for grinding lenses. |
| US3088613A (en) * | 1960-04-15 | 1963-05-07 | Pandjiris Weldment Company | Positioning mechanism for spherical bodies |
| US2998676A (en) * | 1960-04-29 | 1961-09-05 | Charles A Hawkins | Precision lapping device |
| US3289354A (en) * | 1964-03-11 | 1966-12-06 | Brunswick Corp | Ball reconditioner |
| US3739531A (en) * | 1971-05-17 | 1973-06-19 | J Sharbaugh | Automatic sphere grinder with automatic feeder |
-
1987
- 1987-06-30 DE DE3721592A patent/DE3721592C1/en not_active Expired
-
1988
- 1988-06-27 US US07/212,382 patent/US4856231A/en not_active Expired - Lifetime
- 1988-06-29 ES ES88110392T patent/ES2025248B3/en not_active Expired - Lifetime
- 1988-06-29 EP EP88110392A patent/EP0297551B1/en not_active Expired - Lifetime
- 1988-06-29 AT AT88110392T patent/ATE66173T1/en not_active IP Right Cessation
-
1991
- 1991-10-22 GR GR91401590T patent/GR3002959T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES2025248B3 (en) | 1992-03-16 |
| ATE66173T1 (en) | 1991-08-15 |
| EP0297551A1 (en) | 1989-01-04 |
| DE3721592C1 (en) | 1988-12-01 |
| GR3002959T3 (en) | 1993-01-25 |
| US4856231A (en) | 1989-08-15 |
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