EP1761373B1 - Kalibriermaschine für grosse natursteinplatten wie granit oder harten stein - Google Patents

Kalibriermaschine für grosse natursteinplatten wie granit oder harten stein Download PDF

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Publication number
EP1761373B1
EP1761373B1 EP04720965A EP04720965A EP1761373B1 EP 1761373 B1 EP1761373 B1 EP 1761373B1 EP 04720965 A EP04720965 A EP 04720965A EP 04720965 A EP04720965 A EP 04720965A EP 1761373 B1 EP1761373 B1 EP 1761373B1
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EP
European Patent Office
Prior art keywords
slab
disks
rollers
roller
station
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Expired - Lifetime
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EP04720965A
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English (en)
French (fr)
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EP1761373A1 (de
Inventor
Luigi Pedrini
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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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B24B41/047—Grinding heads for working on plane surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/048—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with a plurality of saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/18—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by milling, e.g. channelling by means of milling tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/20—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by planing, e.g. channelling by means of planing tools

Definitions

  • the invention concerns a facing machine for large plates of natural stone, e.g. granite and hard stone slabs, which machine is adapted to dress such slabs by an improved process that makes the whole operation easier and quicker to complete even as the machine is fed slabs of varying size in close succession.
  • a machine according to the preamble of claim 1 is known from DE 297 05 698 U1 .
  • the state of the art provides, among numbers of different machines designed for dressing wide slabs and/or surfaces, a granite slab-sizing machine of the kind described in Patent No. FR 2521475 , wherein a pair of rollers mounted at a slab surface grooving station are driven rotatively about a transverse axis to the slab direction of advance.
  • the rollers comprise a plurality of cutting disks provided with diamond tool teeth and spaced apart to span the slab width, with each roller disk being in intermeshed relationship with disks of a leading/trailing one of the rollers.
  • the slabs are then taken, on an underlying belt conveyor, to a dressing station which includes a plurality of diamond grinding wheels mounted for rotation about a vertical axis.
  • the state of the art also provides a facing machine for ceramic tiles, as described in PCT Patent Application Publication No. WO 03/028968 , which comprises a structure arranged to hold and set for cutting depth at least a pair of rollers mounted at a grooving station and being driven rotatively about a transverse axis to the direction of advance of the tiles, the tiles being transported on a belt conveyor beneath.
  • the rollers comprise a plurality of cutting disks provided with diamond tool teeth and spaced apart to span the tile width.
  • the machine further comprises a dressing station that includes a plurality of diamond grinding wheels mounted for rotation about a vertical axis.
  • the set of disks in one roller have all the same working diameter; also, the rollers comprised of the cutting disks are carried on a common holding structure which is adjustable to set the cutting depth of the disks.
  • a common holding structure which is adjustable to set the cutting depth of the disks.
  • the roller holding structure is mounted to swing around a parallel shaft to the work surface in a transverse direction to the direction of advance of the latter, and is associated with a swing movement setting and locking device effective to compensate for variations in the cutting diameters of the mounted rollers.
  • the grinding wheels comprise rotary heads holding diamond tools that are rotated about a vertical axis jointly with the tool heads.
  • slabs of different sizes may have to be fed in random succession. This involves re-setting and replacing the rollers with rollers of wider or narrower working front.
  • a condition for the disks to operate as expected is that all the cutting edges across the roller generatrix line should be at work simultaneously.
  • a disk left out of work is bound to elude wear and retain a larger diameter than the disks kept engaged with the work.
  • diamond tools of appropriate hardness to ensure a sufficiently long working life are required. However, wear and loss of diameter cannot be avoided during the process, therefore all the disks in one roller must be kept at work simultaneously.
  • the design of dressing machines has favored the use of heavy vertical-axis rotary heads carrying a variety of oscillating or rotating tools for the purpose of maintaining a uniform cutting action across the slab surfaces, the rotary heads being mounted to a swing beam through cross-reciprocating devices for when the slab width exceeds the span of the heads.
  • Most material removal has been effected using vertical-axis rotary heads equipped with rotating tools, such as varying forms of diamond-bit rollers.
  • rotating tools such as varying forms of diamond-bit rollers.
  • the high pressure force exerted through the generatrix line of the roller or of the abrasive sector can easily damage a slab which may be but 2 cm thick.
  • the technical problem is one of providing a machine for facing wide slabs, which machine should incorporate a roller adjuster adapted to re-position the cutting disks in the rollers to suit the width of each slab being processed, whereby the tools can be set as required without the operation involving long downtime for the machine and/or the availability of qualified personnel.
  • a facing machine for large plates of natural stone, e.g. granite and hard stone slabs which machine comprises: a pair of rollers driven rotatively about a transverse axis to the slab direction of advance and mounted at a work surface grooving station; wherein the rollers consist of a plurality of cutting disks having the same working diameter or being adjustable in height so as to compensate for minor variations in the roller diameters; wherein the cutting disks are fitted with diamond tool teeth and aligned together in spaced apart relationship across the slab width so as to intermesh with the cutting disks of a leading/trailing one of the rollers; and wherein the slabs are transported on a belt conveyor to a subsequent facing station where the ridges between grooves are removed; characterized in that at least one of said rollers is provided with an adjuster for setting its position relative to the other of said rollers and to a holding structure along a transverse direction to the slab direction of advance on said belt conveyor for the purpose of allowing full or partial or
  • each disk is slightly smaller than the minimum spacing between aligned disks in the roller.
  • said disks are closely spaced apart at one end of the roller and spaced twice the distance at other end of the roller.
  • the disks of the leading roller being mounted at close spacings are set to work near one longitudinal edge of a slab, whereas the disks of the trailing roller being mounted at close spacings are set to work near the other longitudinal edge of the slab, thereby the disks mounted at twice said spacing are set to cut interleaved or non-interleaved grooves according to the slab width.
  • At least one of said rollers is mounted rotatively on a carriage for a traversing movement to the slab direction of advance along crosswise guide rails that are connected to a holding structure, in turn adjustable in height to set the cutting depth of the tool teeth into the slab surface.
  • both said rollers are mounted rotatively on carriages for traversing movement to the slab direction of advance.
  • the position(s) of said carriage-mounted roller(s) for traversing movement to the slab direction of advance is(are) set by means of a rack-and-pinion mechanism driven off a geared motor on each carriage.
  • a carriage braking or locking mechanism is provided additionally to the roller setting mechanism in the transverse direction.
  • the slab surface grooving station is followed by a dressing station where the ridges left over from the grooving station are removed, said dressing station comprising a machine equipped with a swing beam which is oscillated in the transverse direction and carries a plurality of rotary heads mounted for rotation about a vertical axis and provided with swinging or rotating diamond tools.
  • a slab width gauging device is associated with the slab surface grooving station, directly ahead of or at a suitable distance away from it along the slab transport, said gauging device being effective to control the roller(s) positioning in the transverse direction.
  • Figure 1 is a cross-sectional view, taken along the slab direction of advance and through the roller pair at the slab grooving station
  • Figure 2 is a perspective view of the wide slab facing machine comprising the slab grooving station shown in Figure 1 and a dressing station with a swing beam which is oscillated in a transverse direction to the slab and carries conventional heads for rotation about a vertical axis
  • Figures 3 , 4 and 5 are plan views of the grooving station construction, outside of the rollers and a slab being processed, showing it at three typical settings for processing narrow, wide, and intermediate width slabs
  • Figure 6 is a perspective representation of the longitudinal section of the grooving station shown in Figure 1
  • Figure 7 is a perspective view of the grooving station complete with its roller holding, driving and setting arrangements.
  • FIG. 1 Shown in Figure 1 are cutting disks 1 which are fitted with diamond tool teeth 2 and assembled into leading and trailing rollers 3 and 4 along a direction A of advance of the slabs through a grooving station 5.
  • Each roller is driven by a respective motor 6.
  • Each roller is mounted rotatively on a respective carriage 7, which carriage is driven for a traversing movement to the slabs along guide rails 8, the latter being adjustable for height on a shift frame 9 that is movable in a vertical direction to the work surface.
  • the frame 9 is moved by means of mechanical actuators 10, in turn driven through angle drives 11 off a common motor 12.
  • the shift frame is adjusted for height relative to an overhead structure 13 that carries the grooving station 5 in order to set the cutting depth of the disk tool teeth 2 into the slab surface.
  • Each carriage 7 is positioned in the transverse direction by means of a rack 14 in mesh engagement with a drive pinion (not shown) of a respective gear motor 15. These racks are attached with their ends rigidly to the shift frame 9, as are
  • a dressing station 16 for removing the ridges between grooves is shown in which a beam 17 carrying the vertical-axis rotary heads 18, here eight such heads, can be oscillated in a crosswise direction, the station 16 being placed downstream of the grooving station 5 along the direction A.
  • a conventional gauging device 19 is provided upstream of the grooving station, and is operative to gauge a slab width before the slab enters the working area of the grooving station 5.
  • a slab edge trimmer is provided upstream of the facing machine, said device may be placed directly ahead of said station 5, as shown.
  • the gauging device may be placed a suitable distance ahead the grooving station 5 to gauge the slab width dimension and control the transverse positioning of the rollers 3, 4 at the grooving station 5 to suit the slab width.
  • the slab facing machine operates as follows. Slabs to be processed are fed in the direction A on the belt conveyor.
  • the gauging device 19 gauges a slab width dimension and controls the position settings of the rollers 3 and 4 in the transverse direction such that all the disks of each roller will be at work simultaneously.
  • the slabs may have irregularly cut edges. Accordingly, the gauging step is to be carried out a sufficient distance away from the grooving station 5 for the side contours of a slab to be fully gauged.
  • a conventional computing device will then determine the best lateral positioning of the rollers across the slab. In this way, the rollers 3 and 4 are set into a suitable one of the typical configurations shown in Figure 3 , 4, or 5 .
  • the steps of gauging the slab width and adjusting one or both rollers 3, 4 may be carried out manually, if desired.
  • the outboard disks 1 in the rollers will process the slab near its outer edges, yet inside of said edges, to keep the diamond tool teeth 2 always in contact with the slab surface.
  • the roller area with the packed disks 23 will cut grooves 26 that leave separation ridges having the smallest width in the slab, whereas the roller areas with the disks 24 at twice the spacing will cut grooves 28 that leave wider ridges than the cutting tool teeth 2.
  • the disks 1 intermesh and will produce grooves 27 with ridges of least width, since the disks in the trailing roller 4 are cutting through the wide ridges left by the disks of the leading roller 3.
  • the slab will show a series of grooves 27 separated by ridges of minimal width, albeit produced by disks of different rollers.
  • the cutting pressure force applied by the disks 1 in one roller, 3 or 4 acts mainly in the cutting direction. Nevertheless, the carriages 7 would be provided with a locking device (not shown) for added safety against their moving out of the set positions.
  • the station 5 for grooving the region 26, 27 or 28 of the slab surface 20 could have one roller adjustable in the transverse direction as previously described and the other roller fixed in the transverse direction, although movable vertically on the same frame 9 as the adjustable roller.
  • a slab would have to be processed in a preferred orientation across the belt conveyor.
  • the dressing station 16 will then remove the ridges or lands left between grooves.
  • the slab regions 26 and 27 with the narrow ridges will be the easiest to process, and the regions 28 with the wide ridges longer to face by the vertical-axis rotary heads.
  • the wide slab facing machine described above uses the grooving station 5 to remove material at a high rate by centering the cutting action on the individual tool tooth 2 rather than on the generatrix line of the roller as in the prior art. This improves the cutting action, reduces the slab loading, extends the tool lifespan, and allows the cutting disks 1 of the first and second rollers 3 and 4 to be adjusted for mutual alignment in less time.
  • the roller working front divided into areas 23 where the disks are closely spaced (packed) and areas 24 where they are at twice that spacing, any range of slab widths within maximum groove overlap at 27 ( Figure 3 ) to zero groove overlap at 28 ( Figure 4 ) become processable.
  • the working front of the disks, at a narrow spacing in the area 23 or at twice the spacing in the area 24 of the same roller can be altered to increase or decrease the processed slab width by the roller pair.
  • the grooving station 5 could be provided as a separate structure from the dressing station 16 needed to complete the dressing process.
  • the rollers 3 and 4 could have the disks spaced apart at twice the width of their individual working front throughout.
  • the grooving would leave here sideband ridges that are wider than in the middle region, where the ridges can be very narrow by virtue of the grooves cut by the leading roller meshing with the grooves cut by the trailing roller.
  • the heads of the facing station would take more time to complete the ridge removing step due to the bands of wider ridges present along the slab sides.
  • the slab width gauging device 19 could be arranged for the slab width to be measured manually, and the working width of the rollers 3 and/or 4 also set manually.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Spectrometry And Color Measurement (AREA)

Claims (10)

  1. Kalibriermaschine für große Platten aus Naturstein, z.B. Granit- und Hartgesteinplatten, wobei die Maschine umfasst: ein Paar von Walzen, welche rotierend um eine zur Richtung der Plattenbewegung querlaufende Achse angetrieben werden und welche an einer Arbeitsflächen-Nutstation montiert sind, wobei die Walzen aus einer Vielzahl von Trennscheiben (1) bestehen, welche den gleichen Arbeitsdurchmesser aufweisen oder derart in der Höhe einstellbar sind, dass kleinere Abweichungen in den Walzendurchmessern kompensiert werden können, wobei besagte Trennscheiben mit Diamantwerkzeugzähnen (2) bestückt und in voneinander beabstandeter Beziehung über die Plattenbreite zusammen ausgerichtet sind, so dass sie sich mit den Trennscheiben einer vorderen/hinteren Walze verzahnen, wobei wenigstens eine der besagten Walzen (3, 4) mit einer Einstellvorrichtung (14, 15) ausgestattet ist, um deren Position relativ zu der anderen der besagten Walzen und zu einer Halterungskonstruktion (9) längs einer Querrichtung zur Richtung (A) der Plattenbewegung einzustellen, um gemäß der Breite einer zu bearbeitenden Platte eine vollständige (27) oder eine teilweise (27 und 28) oder keine (28) Ineinanderschachtelung der mit den besagten Scheiben geschnittenen Nuten zu ermöglichen, dadurch gekennzeichnet, dass besagte Scheiben an einem Ende der Walze eng beabstandet sind (23) und an dem anderen Ende der Walze (3, 4) mit dem doppelten Abstand beabstandet sind (24), und dass die Platten (20) in Bewegungsrichtung auf einem Förderband zu einer nachfolgenden Kalibrierstation transportiert werden, wo die Grate zwischen den Nuten entfernt werden.
  2. Kalibriermaschine nach dem vorangehenden Anspruch 1, dadurch gekennzeichnet, dass die Schneidefläche jeder Scheibe (1) etwas kleiner ist als der minimale Abstand (23) zwischen ausgerichteten Scheiben auf der Walze (3, 4).
  3. Kalibriermaschine nach dem vorangehenden Anspruch 1, dadurch gekennzeichnet, dass besagte Scheiben an einem Ende der Walze (3, 4) eng beabstandet (23) sind.
  4. Kalibriermaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Scheiben der vorderen Walze (3), welche mit engen Abständen (23) montiert sind, derart eingestellt sind, dass sie nahe einer Längskante der Platte (20) arbeiten, während die Scheiben der hinteren Walze (4), welche mit engen Abständen (23) montiert sind, derart eingestellt sind, dass sie nahe der anderen Längskante der Platte arbeiten, wodurch die Scheiben, welche mit dem zweifachen besagten Abstand (24) montiert sind, so eingestellt sind, dass sie entsprechend der Plattenbreite ineinandergeschachtelte (27) oder nichtineinandergeschachtelte (28) Nuten schneiden.
  5. Kalibriermaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass wenigstens eine der besagten Walzen (3, 4) rotierend (21) auf einem Fahrwerk (7) montiert ist, und zwar für eine Querbewegung zur Bewegungsrichtung (A) der Platten entlang querlaufender Führungsschienen (8), welche mit der Halterungskonstruktion (9) verbunden sind, und welche wiederum in der Höhe (10, 11) einstellbar sind, um die Schnitttiefe der Werkzeugzähne (2) in die Plattenoberfläche (20) einzustellen.
  6. Kalibriermaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass beide besagten Walzen (3, 4) für eine Querbewegung zur Bewegungsrichtung (A) der Platten rotierend (21) auf Fahrwerken (7) montiert sind.
  7. Kalibriermaschine nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, dass die Position(en) besagter, für eine Querbewegung zur Bewegungsrichtung der Platten auf Fahrwerken montierter Walze(n) (3, 4) mittels eines Zahnstangenmechanismus (14) eingestellt wird(werden), welcher von einem Getriebemotor (15) auf jedem Fahrwerk angetrieben wird.
  8. Kalibriermaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass zusätzlich zu dem Einstellmechanismus (14, 15) der Walze(n) in der Querrichtung ein Fahrwerk-Bremsmechanismus oder Fahrwerk-Blockierungssmechanismus vorgesehen ist.
  9. Kalibriermaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Plattenoberflächen-Nutstation (5) eine Endbearbeitungsstation (16) folgt, an der die von der Nutstation zurückgelassenen Grate entfernt werden, wobei besagte Endbearbeitungsstation eine mit einem Schwingbalken (17) ausgestattete Maschine umfasst, welcher in der Querrichtung oszilliert und welcher eine Vielzahl von Drehköpfen (18) trägt, die zur Rotation um eine vertikale Achse montiert sind und mit schwingenden oder rotierenden Diamantwerkzeugen ausgestattet sind.
  10. Kalibriermaschine nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Plattenoberflächen-Nutstation (5) unmittelbar vorangehend oder in einem geeigneten Abstand davon längs des Plattentransportes eine Plattenbreiten-Abtastvorrichtung (19) zugeordnet ist, wobei besagte Abtastvorrichtung die Regelung der Positionierung der Walze(n) in der Querrichtung bewirkt.
EP04720965A 2004-03-16 2004-03-16 Kalibriermaschine für grosse natursteinplatten wie granit oder harten stein Expired - Lifetime EP1761373B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2004/000128 WO2005087470A1 (en) 2004-03-16 2004-03-16 Facing machine for large plates of natural stone, like granite and hard stones

Publications (2)

Publication Number Publication Date
EP1761373A1 EP1761373A1 (de) 2007-03-14
EP1761373B1 true EP1761373B1 (de) 2008-07-09

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EP04720965A Expired - Lifetime EP1761373B1 (de) 2004-03-16 2004-03-16 Kalibriermaschine für grosse natursteinplatten wie granit oder harten stein

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EP (1) EP1761373B1 (de)
AT (1) ATE400417T1 (de)
BR (1) BRPI0418612A (de)
DE (1) DE602004014997D1 (de)
ES (1) ES2309512T3 (de)
WO (1) WO2005087470A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2322320A1 (de) * 2009-11-17 2011-05-18 Mbd S.R.L. Einstell-/Poliersystem für Oberflächen von Steinmaterial mit verringerter Lärmemission

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29705698U1 (de) * 1997-03-29 1997-06-19 Blanke-Bohne, J., Prof. Dr., 44879 Bochum Vorrichtung zur Herstellung von großflächigen Dünnsteinplatten
ITMO20010196A1 (it) * 2001-10-03 2003-04-03 Pedrini Luigi Calibratrice dello spessore di materiali in lastre, filagne opiastrelle, quali il gres porcellanato, granito, pietre dure o marmo

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ATE400417T1 (de) 2008-07-15
ES2309512T3 (es) 2008-12-16
DE602004014997D1 (de) 2008-08-21
BRPI0418612A (pt) 2007-05-02
EP1761373A1 (de) 2007-03-14
WO2005087470A1 (en) 2005-09-22

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