EP3702102A1 - Machine et unité de broyage et de polissage d'une feuille de verre - Google Patents

Machine et unité de broyage et de polissage d'une feuille de verre Download PDF

Info

Publication number
EP3702102A1
EP3702102A1 EP20159903.2A EP20159903A EP3702102A1 EP 3702102 A1 EP3702102 A1 EP 3702102A1 EP 20159903 A EP20159903 A EP 20159903A EP 3702102 A1 EP3702102 A1 EP 3702102A1
Authority
EP
European Patent Office
Prior art keywords
grinding
wheel
polishing
slide
pneumatic
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.)
Pending
Application number
EP20159903.2A
Other languages
German (de)
English (en)
Inventor
Pierfranco Margaria
Aldo FACCENDA
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
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
Application filed by Bottero SpA filed Critical Bottero SpA
Publication of EP3702102A1 publication Critical patent/EP3702102A1/fr
Pending legal-status Critical Current

Links

Images

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
    • 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
    • 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
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
    • 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 machine and to a unit for grinding and polishing a glass sheet.
  • the present invention relates to a machine and a unit for grinding and polishing perimeter surfaces of a glass sheet, that is to say, those outer perimeter surfaces that extend transversely to the major surfaces of said glass sheet.
  • a first type belongs to the category of so-called "bilateral" grinding machines, into which the sheets are fed flat and their opposite perimeter surfaces are ground simultaneously by two grinding-polishing assemblies arranged opposite one another.
  • a second type comprises the so-called "rectilinear” grinding machines, into which the sheets are fed at an angle and are ground by moving the perimeter surfaces over an underlying grinding-polishing assembly.
  • each grinding-polishing assembly comprises a plurality of grinding units that are arranged alongside one another and are independent of one another to remove a given amount of material from the sheet, and a plurality of polishing units that are also independent of one another and arranged alongside one another and downstream of the grinding units in the feeding direction of the sheets to polish the surfaces that have been ground by said grinding units.
  • Each grinding unit comprises a respective grinding wheel, an electric motor to make the grinding wheel rotate about its axis, and a device for positioning the grinding wheel in a given operating position for removing the material.
  • Each positioning device comprises, in turn, a slide to support the wheel and an electric motor for moving and positioning said slide.
  • Each polishing unit comprises a respective polishing wheel that is also made to rotate about its axis by an electric motor and is also mounted on a respective slide driven by a respective actuator suitable to push the respective slide and, as a consequence, the respective polishing wheel, against the ground surface of the sheet.
  • the slides carrying the polishing wheels are driven by pneumatic cylinders, or by means of mechanical springs with variable preload or even by means of electric torque-controlled motors.
  • the grinding machines known in the prior art of the type described above are usually designed and built according to the customer's needs and, in particular, according to the type of sheets to be machined, but especially according to the machining processes to be performed to obtain the desired profile and required level of precision/surface finish. To do this, a given number of grinding units and a predefined number of polishing units are provided and fitted at the planning stage.
  • the number of grinding units or of finishing units cannot usually be changed and so the machine cannot be converted or customised to perform different machining processes, or to carry out a different grinding and/or polishing programme.
  • the purpose of the present invention is to provide a grinding machine, with characteristics such as to satisfy the needs described above and, in particular, the need to reconfigure or modify the current or planned configuration within a very short time and in a simple and cost-effective manner.
  • a further purpose of the present invention is to provide a machine, with characteristics such as to allow the machine to be reconfigured without having to dismantle or add or replace the grinding/polishing assemblies mounted on the machine at the time of production.
  • the present invention also relates to a unit for grinding and polishing a glass sheet.
  • reference numeral 1 is a machine for grinding and polishing glass sheets 2, in the example that is illustrated flat rectangular glass sheets having two opposite flat major surfaces, denoted by reference numeral 3, and four consecutive flat perimeter or lateral surfaces, one of which is denoted by reference numeral 5.
  • the machine 1 which may be either a bilateral machine, that is to say, where the sheets 2 are fed flat, or a rectilinear machine, that is to say, where the sheets 2 are fed at an angle, comprises a rigid base 6 and a motor-driven sheet conveyor assembly 7, of a type known in the prior art and partially visible in the accompanying figures, to feed a series 8 of sheets 2 to be ground along a rectilinear path 9 and through a station 13 for grinding and polishing the perimeter surfaces 5.
  • the assembly 7 is controlled by an electronic control unit 16 of the machine 1.
  • the station 13 houses a row 18 of grinding units independent of one another and arranged alongside one another in a direction parallel to the path 9.
  • the row 18 of abrasive units comprises a group A of grinding units 19, of a type known in the prior art, and a group B of polishing units 20, also of a type known in the prior art, which polish the surfaces 5 ground by the group A.
  • Each grinding unit 19 comprises a respective grinding wheel 22, which is made to rotate by a respective electric motor 23 controlled by the electronic unit 16 and is carried by a corresponding slide 24.
  • the slide 24 is coupled to a guide 25 fixed to the base 6 so as to be able to slide in a direction orthogonal to the path 9 in opposite directions driven by an electric motor 26, conveniently a servomotor controlled by the electronic unit 16.
  • Each polishing unit 20 comprises a respective polishing wheel 27, which is made to rotate about its respective axis by an electric motor 28 controlled by the electronic unit 16 and is mounted on a slide 29 driven by a corresponding actuator 29', for example, a pneumatic cylinder controlled by a proportional solenoid valve, controlled, in turn, by the electronic unit 16 to push the corresponding spring 27 against the surface 5 of the sheet 2.
  • a corresponding actuator 29' for example, a pneumatic cylinder controlled by a proportional solenoid valve, controlled, in turn, by the electronic unit 16 to push the corresponding spring 27 against the surface 5 of the sheet 2.
  • the row 18 of abrasive units comprises a group C of abrasive grinding/polishing units 30 arranged between the units 19 and 20.
  • Each of the abrasive units 30 is configurable, that is to say, it can be adjusted or set to grind or to polish the surfaces 5, as will be described in more detail below.
  • Each unit 30, which is independent of the other abrasive units, comprises a wheel-carrier head 31, on which a grinding wheel 22 or a polishing wheel 27 can be mounted.
  • the wheel-carrier head 31 is made to rotate about its respective axis by an electric motor 32 controlled by the electronic unit 16 and is mounted on or carried by a slide 33.
  • the slide 33 is coupled to a rectilinear guide 34 integral with the base 6 and is able to move in a direction orthogonal to the path 9 in a direction K driven by a configurable electro-pneumatic device, denoted by reference numeral 35.
  • the device 35 comprises an attachment frame 36 integrally connected to the base 6 and a rectilinear guide 37 integrally connected to the frame 36 and extending in a direction orthogonal to the path 9.
  • the slide 33 is slidingly coupled to the guide 37 and is able to move in opposite directions along the guide driven by a configurable electro-pneumatic actuator assembly, denoted by reference numeral 38.
  • the assembly 38 comprises a drive screw 39 orthogonal to the path 9 and rotatably coupled to said guide 37 in an axially fixed position by means of a pair of end bearings.
  • the screw 39 is made to rotate in opposite directions by a geared motor 40 of a type known in the prior art and schematically illustrated, having an electric motor 41 controlled by the unit 16.
  • a nut-screw 42 coupled to the screw 39 is a nut-screw 42 to which there is integrally connected a tubular sleeve 43, which forms an axial extension of the nut-screw 42 and surrounds the screw 39 with radial clearance.
  • a section of the sleeve 43 defines the rod 44 of a double-acting pneumatic actuator 45, which is part of the assembly 38 and extends coaxially with the axis 39A of the screw 39.
  • the pneumatic cylinder 45 comprises a liner 46, which is permanently connected to the slide 33 by means of screws, surrounds the rod 44 and has two opposite end sections, denoted by reference numerals 50 and 51.
  • the sections 50 and 51 are coupled to an outer side surface of the rod 44 in a fluid-tight manner so as to delimit with said rod an airtight chamber 52.
  • the chamber 52 houses a plunger 53, which surrounds the rod 43 and is permanently connected to said rod 43. Conveniently, the plunger 53 is formed as one piece with the rod 43.
  • the plunger 53 divides the chamber 52 into two variable-volume airtight chambers, denoted by reference numerals 54 and 55.
  • the chambers 54 and 55 are both connected by means of ducts to a pneumatic valve selection assembly 56 of the type comprising proportional valves and controlled by the unit 16 to selectively pressurise the chambers 54 and 55 in a continuous and controlled manner.
  • each unit 30 allows each unit 30 to be configured as a grinding unit or as a polishing unit according to the processes to be performed in the different grinding and polishing cycles.
  • the end section 51 of the liner 49 has an axial shoulder in abutment against the plunger 53, thus achieving a rigid coupling between the plunger 43, the liner 46 and the slide 33. It therefore follows that, when a grinding wheel 22 is mounted on the wheel-carrier head 31, the unit 30 acts as one of the grinding units 19.
  • a pneumatic spring is created between the plunger 53 and the section 51, the stiffness of such spring being variable or settable by adjusting the air pressure inside the chamber 54 by means of the valve assembly 56.
  • the pressure inside the chamber 54 can also be adjusted by means of the motor 41, that is to say, by adjusting the position of the plunger 53 in relation to a reference position and, thus, varying the volume of the chamber 54.
  • the unit 30 when a polishing wheel 27 is mounted on the wheel-carrier head 31, the unit 30 thus configured acts as one of the polishing units 20. In fact, during polishing, the wheel 27 is pushed against the sheet 2 by applying a predefined and constant pushing force.
  • the grinding and polishing machine 1 described herein is a machine that can be configured in an extremely simple way and in a very short time to enable quick production changeover. This is essentially due to the fact that some of the units mounted on-board the machine can perform the twofold function of grinding and polishing, and switching between the two functions is achieved simply by pressurising/depressurising the two air chambers.
  • the machine 1 described herein can be configured to perform grinding and polishing processes in different grinding-polishing programmes.
  • the machine 1 could comprise just one unit 30 or a number of units 30 other than the number described herein and chosen, in the planning stage, to obtain sheets with perimeter surfaces having different geometries regardless of their thickness or perimeter surfaces with different surface finishes.
  • the liner 46 of the actuator 45 could be permanently connected to the nut-screw 42 and the plunger 53 could be permanently connected to the slide 33.
  • pneumatic actuator 45 could be arranged in an eccentric position with respect to the axis of the screw 39.
  • the grinding head carries both the grinding wheel and the polishing wheel on a same rotating shaft and these are selected in a way that is known in the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP20159903.2A 2019-02-28 2020-02-27 Machine et unité de broyage et de polissage d'une feuille de verre Pending EP3702102A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000002941A IT201900002941A1 (it) 2019-02-28 2019-02-28 Macchina e unita' di molatura e lucidatura di una lastra di vetro

Publications (1)

Publication Number Publication Date
EP3702102A1 true EP3702102A1 (fr) 2020-09-02

Family

ID=66641344

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20159903.2A Pending EP3702102A1 (fr) 2019-02-28 2020-02-27 Machine et unité de broyage et de polissage d'une feuille de verre

Country Status (2)

Country Link
EP (1) EP3702102A1 (fr)
IT (1) IT201900002941A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0689899A1 (fr) * 1994-06-28 1996-01-03 BOTTERO S.p.A. Dispositif pour le meulage de plaques de verre
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
ITTO20080765A1 (it) * 2008-10-17 2010-04-18 Biesse Spa Gruppo di lucidatura per una macchina per la lavorazione di bordi di lastre in vetro, marmo e simili materiali lapidei

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0689899A1 (fr) * 1994-06-28 1996-01-03 BOTTERO S.p.A. Dispositif pour le meulage de plaques de verre
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
ITTO20080765A1 (it) * 2008-10-17 2010-04-18 Biesse Spa Gruppo di lucidatura per una macchina per la lavorazione di bordi di lastre in vetro, marmo e simili materiali lapidei

Also Published As

Publication number Publication date
IT201900002941A1 (it) 2020-08-28

Similar Documents

Publication Publication Date Title
EP3702103B1 (fr) Procédé et ensemble permettant de meuler et de polir un angle d'une feuille de verre
CN102596463B (zh) 用于加工优选地板形的工件的窄面的装置
US3972148A (en) Machine tool for finish-grinding the inner surfaces of annular workpieces
US4766703A (en) Adjustable support rest for a cylinder grinding machines or the like
CN101648358B (zh) 曲面精整加工装置
DE102006028164A1 (de) Schleif- und Poliermaschine zum Schleifen und/oder Polieren von Werkstücken in optischer Qualität
WO1999039873A1 (fr) Broche de ponçage
KR20110043403A (ko) 복합 가공 공구 및 가공 방법
CN114888688B (zh) 一种多工位钻头加工中心
EP3702102A1 (fr) Machine et unité de broyage et de polissage d'une feuille de verre
EP2621675A1 (fr) Outil de rodage comportant un élargissement hydraulique, commandé mécaniquement en un ou plusieurs pas
US2639562A (en) Precision locating device
US10040158B2 (en) Honing tool as well as device and method for dressing honing stones
CN101391387B (zh) 工件主轴的往复摆动及分度旋转机构
US4443977A (en) Machine for producing parts having skew surfaces of predetermined configuration
CA1158050A (fr) Rectifieuse, et mode d'emploi connexe
CN109514395A (zh) 一种拨叉槽研磨抛光机
US3524283A (en) Grinding machinery
JP7109769B2 (ja) 機械加工装置
EP3875219B1 (fr) Unité de broyage ou de polissage d'une feuille, en particulier une feuille de verre, et procédé de traitement de feuilles à l'aide d'une telle unité
JP2000263393A (ja) 研削装置
US4221080A (en) Work-tables of grinding machines
CN110253391B (zh) 打磨装置
US3271905A (en) Master cam actuator
US2254784A (en) Grinding wheel feeding mechanism

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20210216

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20220831

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20240216