EP3639973A1 - Méthode de meulage de feuilles de verre - Google Patents

Méthode de meulage de feuilles de verre Download PDF

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Publication number
EP3639973A1
EP3639973A1 EP19204175.4A EP19204175A EP3639973A1 EP 3639973 A1 EP3639973 A1 EP 3639973A1 EP 19204175 A EP19204175 A EP 19204175A EP 3639973 A1 EP3639973 A1 EP 3639973A1
Authority
EP
European Patent Office
Prior art keywords
grinding
sheets
grinding wheel
abrasive
station
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Withdrawn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
EP19204175.4A
Other languages
German (de)
English (en)
Inventor
Aldo FACCENDA
Pierfranco Margaria
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.)
Bottero SpA
Original Assignee
Bottero SpA
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Filing date
Publication date
Application filed by Bottero SpA filed Critical Bottero SpA
Publication of EP3639973A1 publication Critical patent/EP3639973A1/fr
Withdrawn legal-status Critical Current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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/06—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor involving conveyor belts, a sequence of travelling work-tables or the like
    • 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
    • B24B27/00—Other grinding machines or devices
    • B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
    • 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
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/18—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools
    • B24B49/183—Wear compensation without the presence of dressing tools
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/002—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor for travelling workpieces
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/10—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
    • B24B9/102—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass for travelling sheets

Definitions

  • the present invention relates to a method for grinding glass sheets.
  • the present invention relates to a method for grinding peripheral or side surfaces of a glass sheet, i.e. those surfaces, which extend orthogonally to the extended surfaces of the same glass sheet.
  • the so-called "bilateral" grinding machines belong to a first type. With these, the sheets are fed sideways and the opposite peripheral surfaces thereof are ground simultaneously by two rows of grinding wheels, which face each other and are arranged in a grinding station of the machine.
  • the so-called "rectilinear" grinding machines belong to a second type, wherein the sheets are fed edgeways and they are ground by feeding the peripheral surfaces onto an underlying row of grinding wheels, which are also arranged in a grinding station of the machine.
  • each row of grinding wheels comprises a plurality of grinding wheels and a plurality of polishing wheels arranged downstream of the grinding wheels for polishing the surfaces ground by the grinding wheels; the grinding wheels differ from one another both as regards their abrasive capacity and the abrasive material and/or the matrix in which such abrasive material is dispersed.
  • Some grinding wheels have rotation axes thereof orthogonal to the surface to be ground, others have inclined rotation axes thereof for processing a longitudinal edge of the sheet.
  • Each grinding wheel removes a predetermined quantity of material according to a predetermined grinding programme or cycle.
  • each grinding wheel During the processing of the sheet, each grinding wheel inevitably wears out.
  • the wear of the grinding wheels must be monitored constantly and the relative wear recuperated to guarantee that each grinding wheel works in the condition of removal specified by the grinding programme, i.e. that it has an abrasive surface thereof always arranged on a predetermined fixed grinding or zero plane thereof so that the grinding wheel removes the specified quantity of material from the glass sheet.
  • the recuperation of the wear of a grinding wheel is universally indicated as "zeroing or grinding wheel repositioning", and consists of detecting the wear of the grinding wheel and advancing the grinding wheel by a quantity equal to the wear, so as to bring the abrasive surface of the grinding wheel back to the above-mentioned zero plane.
  • the grinding wheel zeroing is carried out at the same time for all grinding wheels, interrupting the feeding of sheets to be processed to the machine and waiting for the complete emptying of the grinding station i.e. of the sheets in the grinding step and the sheets in the polishing step. At this point, all of the grinding wheels are zeroed, then, the feeding of the sheets to be ground is resumed and the previously interrupted grinding process continued. On resuming the grinding, the polishing wheels do not operate until they receive the first ground sheet.
  • One purpose of the present invention is to provide a method for grinding glass sheets, which allows the drawbacks stated above to be overcome in a simple and inexpensive manner and which allows, in particular, a drastic reduction in machine stopping to zero the grinding wheels with a consequent loss of production.
  • Another purpose of the present invention is to zero a grinding wheel only when it reaches a degree of wear that is no longer tolerable.
  • a method for grinding glass sheets comprising the steps of: feeding an ordered succession of glass sheets arranged at a predetermined distance from each other along a longitudinal direction and through a grinding station; progressively grinding, in said grinding station, at least one peripheral surface of the sheets by means of at least one abrasive grinding wheel independent from each other and side-by-side in a direction parallel to said longitudinal direction; detecting the wear of each of said abrasive grinding wheels and; repositioning each of the abrasive grinding wheels according to the wear detected, characterised in that the repositioning of at least a first of said abrasive grinding wheels is carried out by keeping the succession of sheets moving through said grinding station and in a time period ranging between the moment in which a sheet being ground on the first abrasive grinding wheel has disengaged the first abrasive grinding wheel and before a consecutive sheet to be ground, reaches said first abrasive grinding wheel.
  • the repositioning of said first abrasive grinding wheel is carried out by spacing apart said sheet being ground and said sheet to be ground from each other until they are arranged at a new determined distance from each other, which is greater than said determined distance.
  • the number 1 indicates, as a whole, a machine for grinding glass sheets 2, in the illustrated example, flat, rectangular glass sheets having two opposing, extended, flat surfaces, indicated with 3 and four consecutive, flat peripheral or side surfaces, of which at least one is for grinding, indicated with 5.
  • the machine 1 which can be either a rectilinear machine or a bilateral machine, comprises a rigid rectilinear structure 6 elongated along a rectilinear feeding path 12 of a succession 7 of sheets 2 to be ground, arranged at a distance D from one another.
  • the machine 1 also comprises a motorised unit 8 for conveying sheets, known in itself and partially visible in the attached figures.
  • the unit 8 comprises an input conveyor 9 for the sheets 2 to be ground, an output conveyor 10 for the ground sheets, and an intermediate conveyor 11 for retaining and feeding sheets 2.
  • Conveyor 9 can be controlled independently of conveyor 11, while conveyors 10 and 11 are normally synchronised.
  • the conveyor 11 moves the sheets 2 to be ground inside a station 13 for grinding the peripheral surfaces 5 arranged along the feeding path 12, taking the sheets 2 from one entrance 14 of the station 13.
  • Conveyors 9,10 and 11 are commanded and controlled by an electronic command and control unit 15 for feeding the sheets 2 at a constant speed, generally varying between 0.2 and 20 metres a minute, in a feeding direction 16.
  • the passage of a head and a tail of each of the sheets 2 entering the station 13 is detected by a presence sensor 17 connected to the unit 15. By means of the sensor 17, the unit 25 knows the exact position of all of the sheets 2 along the entire path 12.
  • the station 13 houses a row 18 of grinding units, known in themselves, which are independent of one another and arranged side-by-side in a direction parallel to the path 12.
  • the row 18 of grinding units comprises an assembly A of abrasive units 19, and an assembly B of polishing units 20, which polish the surfaces ground by the assembly A.
  • Each of the abrasive units 19 comprises a respective grinding wheel 22, which has an abrasive surface thereof 22A and is rotated about an axis M thereof orthogonal to the path 12 by a respective motor 23 commanded by the unit 15.
  • Each motor 23 is carried by a relative slide 24, which is slidably coupled to the frame 6 of the machine 1 and in opposite directions along the relative axis M under the thrust of a servomotor 25 controlled by the electronic command and control unit 15.
  • the machine 1 further comprises a respective device for zeroing or repositioning the grinding wheel, known in itself and indicated with 27, connected to the unit 15.
  • Each device 27 allows the wear of the relative abrasive grinding wheel 22 to be detected and the correction of the position of the relative slide 24 so as to keep, over time, the relative abrasive surface 22A of the grinding wheel 22 practically always in a zero position specified in the grinding cycle and illustrated with a continuous line in Figure 1 .
  • each device 27 comprises a reference dowel 30 arranged along the relative axis M in a fixed position, facing and spaced apart from the relative abrasive surface 22A when the abrasive surface 22A itself is arranged in the zero position thereof. Then, each device 27 comprises a contact sensor 31 communicating with the unit 15.
  • a position transducer known and not visible in the attached figures, is associated with the slide 24 or motor 25, to determine the variation of the travel of the slide 24 following the wear of the grinding wheel 22.
  • the electronic unit 15, to which the position of the reference dowel 30 is known, comprises a comparator block 33, which, depending on the signal received from the transducer, detects the wear of the relative grinding wheel 22, i.e.
  • the electronic unit 15 also comprises a position corrector block 34, which, depending on the stated deviation, brings the abrasive surface 22A of the grinding wheel 22 back into the zero position thereof.
  • the electronic unit 15 determines, for example, by detecting the variation in current absorbed by the relative gearmotor 23 or by the gearmotor 23 of the grinding wheel downstream or upon the signalling by a person in charge of the machine 1 or again by counts of the quantity of glass removed by the abrasive grinding wheel that the wear of one of the grinding wheels 22, for example, the grinding wheel 22' in Figure 1 , has reached or is reaching a limit value to guarantee the correct execution of the grinding cycle, it stops, or slows down the input conveyor 9, leaving conveyors 10 and 11 active.
  • the slowing down or stopping of the sheets fed from the conveyor 9 increases the distance D or the space between the last sheet entering the station 13, indicated by 2', and the sheet 2 to be ground, arranged immediately upstream of the entrance 14 to the station 13 and indicated by 2", bringing it to a value D1, which is greater than D.
  • the distance D1 or space between the sheets 2' and 2" is calculated by multiplying a grinding wheel repositioning time by the translation speed of the sheets 2 in the grinding station 13.
  • the grinding wheel repositioning time is at least equal to the sum of a stop time of the rotation of the abrasive grinding wheel, of a wear detection time of the abrasive grinding wheel, of a position adjustment time of the abrasive grinding wheel along the axis M thereof and of a grinding wheel restart time.
  • the repositioning time is in the order of 5-10 seconds.
  • the conveyor 9 introduces the sheet 2" into the grinding station 13 and from this point on, both sheets 2' and 2" are fed into the grinding station 13 at the stated constant speed, while the remaining sheets 2 to be processed continue to be arranged at the distance D.
  • the unit 15 waits for the sheets 2' and 2" to be arranged close to the grinding wheel 22' and, when the tail of the ground sheet 2' overtakes the grinding wheel 22', i.e. the abrasive wheel 22', it is arranged at the space D1, ( Figure 1 ). Keeping the speed of the sheets 2 passing through the station 13 constant, the unit 15 itself stops the rotation of the grinding wheel 22', after which it activates the feeding motor 25 and moves the abrasive surface 22A of the grinding wheel 22' against the relative reference abutment 30, as shown by the dotted line in Figure 1 , actuating the relative motor 25.
  • the unit 15 calculates, in a known manner, the wear, withdraws the slide 24, inverting the direction of rotation of the positioning motor 25 and brings the abrasive surface 22A back into the zero position thereof, and the grinding wheel 22' rotating about the axis M thereof, before the head of the sheet 2" to be ground reaches the grinding wheel 22'.
  • the grinding wheel repositioning described above is repeated for all the grinding wheels 22 of the assembly A at different times and when one of the grinding wheels 22 is close to reaching or has reached a condition of wear.
  • one or more of the abrasive grinding wheels 22 arranged downstream of abrasive grinding wheel 22' in the sheet 2 feeding direction 2 can, if necessary, be repositioned when the space D1 is arranged at the abrasive grinding wheels concerned.
  • the distance or the space D1 is defined so that a part of the abrasive grinding wheels 22 set side-by-side or even all of the abrasive grinding wheels 22 can be simultaneously zeroed when they are at the space D1, as shown in Figure 2 .
  • the number of spaces D1 possible inside the station 13 varies as the number of grinding wheels 22 varies.
  • the conveyor 9 is also synchronised with conveyors 10 and 11 and in such case, the sheets 2 to be ground are arranged on the conveyor manually by an operator or by an automated feeder.
  • the unit 15 sends a suspension signal or commands the feeder so that sheets 2 are not arranged on the conveyor 9 until the space D1 has been created and, at that point, the feeder can start again.
  • the grinding wheel zeroing or repositioning method described above allows the position of the abrasive surfaces of all of the grinding wheels 22 to be taken into account and corrected, without interrupting the feeding of the sheets 2 being processed in the station and without having to remove all of the sheets from the grinding station, as is the case in known machines.
  • this allows the production of ground sheets to be kept basically unchanged because, during the repositioning, the abrasive grinding wheels not affected by the repositioning and the polishing wheels continue to process the sheets and, on the other hand, it allows elevated standards of quality and precision, in terms of the size and shape of the entire ground batch.
  • any grinding wheel can be zeroed or repositioned immediately after detecting the attainment thereof of an advisable or limit wear for safeguarding the correct grinding of the sheets and thus, without waiting for the limit wear of other grinding wheels to be reached, as is the case in known solutions.
  • the described method allows the greater or lesser wear of determined wheels to be taken into account with respect to others and, thus, the grinding of the sheets to always occur under the optimum grinding conditions specified by the grinding cycle, avoiding compromised conditions, as in the known solutions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP19204175.4A 2018-10-19 2019-10-18 Méthode de meulage de feuilles de verre Withdrawn EP3639973A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102018000009638A IT201800009638A1 (it) 2018-10-19 2018-10-19 Metodo per la molatura di lastre di vetro

Publications (1)

Publication Number Publication Date
EP3639973A1 true EP3639973A1 (fr) 2020-04-22

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Application Number Title Priority Date Filing Date
EP19204175.4A Withdrawn EP3639973A1 (fr) 2018-10-19 2019-10-18 Méthode de meulage de feuilles de verre

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EP (1) EP3639973A1 (fr)
IT (1) IT201800009638A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117325018B (zh) * 2023-09-21 2026-01-09 科达制造股份有限公司 一种板材抛磨装置及板材抛磨方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0865870A2 (fr) * 1997-03-11 1998-09-23 Pragma S.r.l. Procédé pour mettre à dimension des éléments en pierre naturelle ou synthétique, en particulier de carreaux en céramique, et machine pour la mise en oeuvre du procédé
EP1063053A2 (fr) * 1999-06-21 2000-12-27 Z. BAVELLONI S.p.A. Machine bilatérale de meulage des bords pour matériaux plats pierreux, en verre ou similaire
EP1422024A1 (fr) * 2002-11-20 2004-05-26 BIESSE S.p.A. Machine et méthode de contrôle de la position opératoire d'une meule dans une machine de meulage de plaques de verre, marbre ou matériaux pierreux
WO2018037303A1 (fr) * 2016-08-24 2018-03-01 Elettromeccanica Bovone Srl Dispositif de réglage amélioré pour l'usinage de tôles plates

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0865870A2 (fr) * 1997-03-11 1998-09-23 Pragma S.r.l. Procédé pour mettre à dimension des éléments en pierre naturelle ou synthétique, en particulier de carreaux en céramique, et machine pour la mise en oeuvre du procédé
EP0865870B1 (fr) * 1997-03-11 2002-12-11 Pragma S.r.l. Procédé pour mettre à dimension des éléments en pierre naturelle ou synthétique, en particulier de carreaux en céramique, et machine pour la mise en oeuvre du procédé
EP1063053A2 (fr) * 1999-06-21 2000-12-27 Z. BAVELLONI S.p.A. Machine bilatérale de meulage des bords pour matériaux plats pierreux, en verre ou similaire
EP1422024A1 (fr) * 2002-11-20 2004-05-26 BIESSE S.p.A. Machine et méthode de contrôle de la position opératoire d'une meule dans une machine de meulage de plaques de verre, marbre ou matériaux pierreux
EP1422024B1 (fr) * 2002-11-20 2008-09-17 BIESSE S.p.A. Machine et méthode de contrôle de la position opératoire d'une meule dans une machine de meulage de plaques de verre, marbre ou matériaux pierreux
WO2018037303A1 (fr) * 2016-08-24 2018-03-01 Elettromeccanica Bovone Srl Dispositif de réglage amélioré pour l'usinage de tôles plates

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