EP0129155A2 - Vorrichtung zum Kalibrieren von Granit, Marmor und ähnlichem in Plattenform - Google Patents

Vorrichtung zum Kalibrieren von Granit, Marmor und ähnlichem in Plattenform Download PDF

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Publication number
EP0129155A2
EP0129155A2 EP84106509A EP84106509A EP0129155A2 EP 0129155 A2 EP0129155 A2 EP 0129155A2 EP 84106509 A EP84106509 A EP 84106509A EP 84106509 A EP84106509 A EP 84106509A EP 0129155 A2 EP0129155 A2 EP 0129155A2
Authority
EP
European Patent Office
Prior art keywords
calibrating
roller
slab
slabs
granite
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.)
Withdrawn
Application number
EP84106509A
Other languages
English (en)
French (fr)
Other versions
EP0129155A3 (de
Inventor
Luigi Pedrini
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
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from IT21695/83A external-priority patent/IT1169435B/it
Priority claimed from IT23702/83A external-priority patent/IT1166542B/it
Application filed by Individual filed Critical Individual
Publication of EP0129155A2 publication Critical patent/EP0129155A2/de
Publication of EP0129155A3 publication Critical patent/EP0129155A3/de
Withdrawn legal-status Critical Current

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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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
    • B24B47/16—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces performing a reciprocating movement, e.g. during which the sense of rotation of the working-spindle is reversed
    • 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
    • B24B7/10—Single-purpose machines or devices
    • B24B7/12—Single-purpose machines or devices for grinding travelling elongated stock, e.g. strip-shaped work

Definitions

  • This invention relates to an apparatus for calibrating granite, marble, and the like in slab form.
  • the abrasive form is caused to work simultaneously across the slab width during the calibrating step.
  • a first requirement is the availability of very high power for the calibrating operation, and above all, the slab material is subjected to very high stresses which may be the cause for local burns and cracks through the material structure.
  • the slabs have in general a substantially constant width, so that the roller, which is normally of a larger size than the slab width, undergoes wear at the middle portion thereof.
  • the abrasive form regions at the roller end portions acquire in actual practice with time a larger thickness relatively to the remainder of the form.
  • the slab will contact preferably the roller end portions, which are less worn than the remainder, and develop processing imperfections.
  • calibration is performed in two successive steps, and specifically, a first step using a horizontal axis roller which has a number of abrasive elements arranged circumferentially on the roller and practically defining a series of grooves on the slab surface which is then precision calibrated by means of an abrasive plate effective to remove the excess material and rotating about a perpendicular axis to the slab plane.
  • Another object of the invention is to provide an apparatus which, by spot working on the slab,can induce no high stresses in the material, thus preventing local damaging due to the high stresses encountered.
  • Still another object of the invention is to provide an apparatus for calibrating granite, marble, and the like in slab form which, owing to its peculiar construction, can be highly reliable and safe in operation.
  • a not unimportant object of this invention is to provide an apparatus for calibrating granite, marble, and the like in slab form, which can make the abrasive form wear substantially uniform and prevent formation of an increased thickness dimension at the calibrating roller end portions.
  • an apparatus for calibrating granite, marble, and the like in slab form comprising a base frame whereon a carpet conveyor for slabs to be calibrated is caused to run, said frame carrying a calibrating head adapted to be moved perpendicularly to the plane of said slabs, characterized in that said calibrating head includes a calibrating roller driven rotatively about its own axis and having its axis substantially parallel to the slab plane and substantially perpendicular to the direction of advance of said slabs, the lateral surface of said roller being provided with at least one calibrating abrasive element extending with a substantially helical pattern around said roller.
  • an apparatus for calibrating granite, marble, and the like in slab form comprises a base frame, generally designated with the reference numeral 1, whereon a convention carpet conveyor for slabs to be calibrated is provided which is generally indicated at 2.
  • pressure members 3 Active on the upper stringer of the carpet conveyor 2 are pressure members 3 which hold the slabs close against the carpet surface.
  • a calibrating head which includes a drive means for translating it along a substantially perpendicular direction to the plane defined by the slabs, thereby the calibrated thickness may be changed contingent on individual requirements.
  • the apparatus may include a plurality of calibrating heads arranged to work sequentially to gradually decrease the slab thickness.
  • the calibrating head is provided with a motor unit 11 which rotatively drives, through drive belts 12, a shaft 5 of a calibrating roller 20 about its own axis, the shaft 5 being supported at its axial ends on plain bearings 6 carried on supporting side members 7 connected to the calibrating head.
  • the cited calibrating roller 20 is provided on its lateral surface with at least one abrasive element 30 made up of diamond grinders and extending helically around the roller.
  • the abrasive element thus obtained may be a single-start helix having a pitch selected to provide a given number of contact points between the slab and roller, or alternatively, or multi-start helices may be provided to at all times create a discrete number of contact spots between the roller and slab.
  • processing i.e. removal of material from the slab 40, for calibration is always carried out at a number of discrete spots or locations represented by the contact spots between the abrasive element and slab.
  • the contact spots between the slab and abrasive material will vary in an axial direction relatively to the roller axis, thereby the whole slab surface is affected, i.e. the whole slab surface comes into contact with the abrasive element defining the slab thickness dimension.
  • processing i.e. contacting of the abrasive element with the slab, is always carried out in the discrete spot mode, so that no overheated areas or undue stresses are created in the slab material, and accurate working of the slab surface can be achieved to provide calibration to the desired thickness.
  • a calibrating roller 20a is provided which rotates together with the shaft 5 and can be displaced axially to the shaft by means of conventional linkages.
  • the roller would be subjected to a reciprocating displacement motion as the roller is being rotated so as to move transversely to the advance or feed direction of the slab 40.
  • the shaft 5 is provided at a middle portion thereof with a piston-like bulge 50 which is received in a cylindrical chamber 51, defined on the interior of the roller, thereby on either sides of the piston 50, first and second regions 51a and 51b, respectively, are created which are in communication with with a pressurized oil supply for alternate delivery to either chamber in order to recirpocate the roller along the shaft direction.
  • the roller has an axial length which is substantially equal to the width of the slab 40 being processed plus the magnitude of the roller axial displacement.
  • processing will not result in the abrasive 30 wearing solely across the area thereof affected by the the slab width, but rather across a much wider area which corresponds in practice to the slab width plus the displacement length.
  • This important technique enables wear of the abrasive form 30 to occur evenly at the ends, thus eliminating the problem of processing imperfections with slabs of slightly different widths, while in the event of the abrasive element showing imperfections, the imperfect abrasive element will not be working at all times in the same position because, owing to the combined movements set up by the roller rotation, to the slab travel movement, and to translation of the roller in the transverse direction, any imperfections would be located at different spots on the slab and result in practice in no significant faults in the processed slab.
  • the calibrating roller is substantially connected to the shaft 5 with the interposition, in practice, of an oil chamber which behaves essentially as a damping element effective to reduce the vibrations which can be transmitted to the shaft because of the abrasive element-slab contact, thus contributing toward improved processing and longer machine life.
  • the invention achieves its objects, and in particular that the invention principle, based on the use of one or more abrasive elements extending in a helical pattern, solves the problem of a calibration process which is free of shocks between the abrasive element and slab by eliminating any breaks in the abrasive element movements across the slab.
  • a calibrating roller displaceable along its axis allows the abrasive element wear to be made significantly even for the full axial length of the calibrating roller, preventing the occurrence of uneven wear of the element which reflect, with time, in faulty slab processing.
  • the materials used, as well as the dimensions and contingent shapes may be any suitable ones to meet individual application requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Treatment Of Fiber Materials (AREA)
EP84106509A 1983-06-20 1984-06-07 Vorrichtung zum Kalibrieren von Granit, Marmor und ähnlichem in Plattenform Withdrawn EP0129155A3 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
IT2169583 1983-06-20
IT21695/83A IT1169435B (it) 1983-06-20 1983-06-20 Apparecchiatura per la calibratura di lastre di granito,marmo e simili
IT2370283 1983-11-14
IT23702/83A IT1166542B (it) 1983-11-14 1983-11-14 Apparecchiatura per la calibratura di lastre di granito, marmo e simili

Publications (2)

Publication Number Publication Date
EP0129155A2 true EP0129155A2 (de) 1984-12-27
EP0129155A3 EP0129155A3 (de) 1986-10-08

Family

ID=26327969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84106509A Withdrawn EP0129155A3 (de) 1983-06-20 1984-06-07 Vorrichtung zum Kalibrieren von Granit, Marmor und ähnlichem in Plattenform

Country Status (1)

Country Link
EP (1) EP0129155A3 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE510105A (de) *
DE60772C (de) * — W. PFANHAUSER in Wien III., Schottenfeldgasse 69, und Berlin S.W., Alte Jakobstrafse 5 Blech-Schleif- und Polirmaschine
CH373660A (it) * 1959-01-10 1963-11-30 Giulioli Dante Macchina per la levigatura di mattonelle o di pavimenti già in opera
US3126674A (en) * 1964-03-31 Finishing machine
EP0004449A2 (de) * 1978-03-20 1979-10-03 J. Lawrence Fletcher Bindungsverfahren für Schleifwerkzeuge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE510105A (de) *
DE60772C (de) * — W. PFANHAUSER in Wien III., Schottenfeldgasse 69, und Berlin S.W., Alte Jakobstrafse 5 Blech-Schleif- und Polirmaschine
US3126674A (en) * 1964-03-31 Finishing machine
CH373660A (it) * 1959-01-10 1963-11-30 Giulioli Dante Macchina per la levigatura di mattonelle o di pavimenti già in opera
EP0004449A2 (de) * 1978-03-20 1979-10-03 J. Lawrence Fletcher Bindungsverfahren für Schleifwerkzeuge

Also Published As

Publication number Publication date
EP0129155A3 (de) 1986-10-08

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