EP0297551B1 - Machine pour meuler des grandes sphères - Google Patents

Machine pour meuler des grandes sphères Download PDF

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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
Authority
EP
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
Application number
EP88110392A
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German (de)
English (en)
Other versions
EP0297551A1 (fr
Inventor
Josef Kusser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
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Publication date
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Priority to AT88110392T priority Critical patent/ATE66173T1/de
Publication of EP0297551A1 publication Critical patent/EP0297551A1/fr
Application granted granted Critical
Publication of EP0297551B1 publication Critical patent/EP0297551B1/fr
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Classifications

    • 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.

Landscapes

  • 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)

Claims (8)

  1. Machine (10) pour meuler des sphères de grande dimension, en particulier en pierre naturelle ou artificielle, avec un outil de meulage en forme de coquille disposé perpendiculairement sur 1'ébauche de la sphère (44) qui est montée sur des corps cylindriques dont au moins l'un est entraîné, et avec un dispositif pour produire la pression de meulage entre l'ébauche de la sphère (44) et l'outil de meulage (46), caractérisée en ce que l'on utilise comme corps cylindriques trois rouleaux (38, 40, 42) dont l'un (38) est configuré comme un rouleau de guidage pouvant pivoter autour d'un axe inciné par rapport à son axe de rotation, que les rouleaux (38, 40, 42) sont prévus sur un support (26) monté sur le bâti de la machine (14, 16, 18, 20, 22) de manière à être librement mobile via des éléments de liaison flexibles (24), et que le dispositif (36) pour produire la pression de meulage agit sur le support (26).
  2. Machine (10) pour meuler des sphères de grande dimension, en particulier en pierre naturelle ou artificielle, avec un outil de meulage en forme de coquille (46) disposé perpendiculairement sur l'ébauche de la sphère (44) qui est montée sur des corps cylindriques d'emplacement fixe, dont l'un au moins est entraîné, et avec un dispositif (36) pour produire la pression de meulage entre l'ébauche de la sphère (44) et l'outil de meulage (46), caractérisée en ce que l'on utilise comme corps cylindriques trois rouleaux (38, 40, 42) dont l'un (38) est configuré comme un rouleau de guidage pouvant pivoter autour d'un axe incliné par rapport à son axe de rotation, que l'outil de meulage en forme de coquille (46) est fixé de manière à être librement mobile au bâti de la machine (14, 16, 18, 20, 22) via des éléments de liaison flexibles (24), et que le dispositif (36), qui compense le poids de l'outil de meulage (46) de manière telle que la pression de meulage désirée est produite, agit sur l'outil de meulage (46).
  3. Machine selon la revendication 1, caractérisée en ce que le support est constitué par un châssis (26) du type fléau de balance suspendu de manière à être librement mobile au bâti de la machine (14, 16, 18, 20, 22).
  4. Machine selon l'une des revendications 1 à 3, caractérisée en ce que les éléments de liaison (24) sont des chaînes ou des câbles.
  5. Machine selon l'une des revendications 1 à 4, caractérisée en ce que le rouleau de guidage (38) est chaque fois à la même distance des deux autres rouleaux (40, 42).
  6. Machine selon l'une des revendications 1 à 5, caractérisée en ce que, lorsqu'il y a plusieurs rouleaux (40, 42) entraînés, ceux-ci peuvent être entraînés à certains moments à des vitesses de rotation différentes.
  7. Machine selon l'une des revendications 1 à 6, caractérisée en ce que les dispositifs (36) sont constitués par des poids (36).
  8. Machine selon l'une des revendications 1 à 7, caractérisée en ce qu'un châssis (26) du type fléau de balance est suspendu de manière à être librement mobile par l'intermédiaire d'éléments de liaison flexibles (24) à la partie de machine (14, 16, 18, 20, 22), et que l'outil de meulage (46) est placé à une extrémité du châssis (26) du type fléau de balance et le dispositif (36) compensant partiellement le poids de l'outil de meulage (46) est placé à l'autre extrémité.
EP88110392A 1987-06-30 1988-06-29 Machine pour meuler des grandes sphères Expired - Lifetime EP0297551B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88110392T ATE66173T1 (de) 1987-06-30 1988-06-29 Maschine zum schleifen grosser kugeln.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3721592 1987-06-30
DE3721592A DE3721592C1 (de) 1987-06-30 1987-06-30 Maschine zum Schleifen grosser Kugeln

Publications (2)

Publication Number Publication Date
EP0297551A1 EP0297551A1 (fr) 1989-01-04
EP0297551B1 true EP0297551B1 (fr) 1991-08-14

Family

ID=6330593

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88110392A Expired - Lifetime EP0297551B1 (fr) 1987-06-30 1988-06-29 Machine pour meuler des grandes sphères

Country Status (6)

Country Link
US (1) US4856231A (fr)
EP (1) EP0297551B1 (fr)
AT (1) ATE66173T1 (fr)
DE (1) DE3721592C1 (fr)
ES (1) ES2025248B3 (fr)
GR (1) GR3002959T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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 (zh) * 2020-10-23 2021-02-05 胡志军 一种装饰用圆形红色石球打磨设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
ATE66173T1 (de) 1991-08-15
US4856231A (en) 1989-08-15
GR3002959T3 (en) 1993-01-25
ES2025248B3 (es) 1992-03-16
DE3721592C1 (de) 1988-12-01
EP0297551A1 (fr) 1989-01-04

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