EP3702103A1 - Verfahren und anordnung zum schleifen und polieren einer ecke einer glasscheibe - Google Patents

Verfahren und anordnung zum schleifen und polieren einer ecke einer glasscheibe Download PDF

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Publication number
EP3702103A1
EP3702103A1 EP20159921.4A EP20159921A EP3702103A1 EP 3702103 A1 EP3702103 A1 EP 3702103A1 EP 20159921 A EP20159921 A EP 20159921A EP 3702103 A1 EP3702103 A1 EP 3702103A1
Authority
EP
European Patent Office
Prior art keywords
mobile drive
grinding
variable
drive member
polishing
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.)
Granted
Application number
EP20159921.4A
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English (en)
French (fr)
Other versions
EP3702103B1 (de
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
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Bottero SpA
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Publication date
Application filed by Bottero SpA filed Critical Bottero SpA
Publication of EP3702103A1 publication Critical patent/EP3702103A1/de
Application granted granted Critical
Publication of EP3702103B1 publication Critical patent/EP3702103B1/de
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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
    • 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 an assembly for grinding and polishing a corner of a glass sheet.
  • Machining of the sharp edges normally comprises, for each sharp edge, a grinding step consisting in a chamfering or rounding of said corner and, very often, a subsequent step of polishing the previously ground corner.
  • the displacement of each wheel along said path is obtained by combining two rectilinear movements along two mutually orthogonal directions.
  • the displacement of the wheels along each of the directions and in relation to the sheet to be machined is obtained by means of a respective electric motor, independent of the other electric motor and controlled together with the other electric motor by a numerical control system common to the two motors.
  • the assemblies of the type described above known in the prior art are difficult to control especially due to the fact that they must be controlled differently depending on whether the grinding wheel or the polishing wheel is used.
  • the position of the grinding wheel must be strictly controlled since it removes material to define the geometry of the ground corner.
  • the polishing wheel must, instead, be pushed and pressed against the profile that has been ground by the grinding wheel for the sole purpose of polishing the ground corner.
  • the purpose of the present invention is to provide an assembly for grinding and polishing a corner of a glass sheet, which overcomes the problems described above in a simple and cost-effective manner and, in particular, makes it possible to maintain the quality of the machined product and, at the same time, to extend the service life of the wheels used for as long as possible.
  • an assembly for grinding and polishing a corner of a glass sheet as claimed in Claim 1.
  • a further purpose of the present invention is to provide a method for grinding and polishing a corner of a glass sheet.
  • FIG. 1 denoted as a whole by reference numeral 1 is a machine for grinding a glass sheet 2.
  • the machine 1 is a bilateral machine, of the kind known in the prior art, comprising a base 3 with two lateral shoulders 4, only one of which is visible in the accompanying figures, and a conveyor 5, also of the kind known in the prior art, arranged between the shoulders 4 to feed the sheet 2 to be ground in a longitudinal and rectilinear direction 6 at a predefined speed.
  • a corner grinding and polishing assembly denoted as a whole by reference numeral 10, is attached to or integral with the base 3.
  • the assembly 10 which, in the example described, is an assembly for grinding and polishing the corners at the front 2A and at the rear 2B of the sheet 2, preferably, but not necessarily, while the sheet 2 is being moved along the direction 6, comprises an attachment frame 12, which is permanently connected to the respective shoulder 5 or coupled to said respective shoulder 4 in a releasable manner.
  • the assembly 10 further comprises two configurable electro-pneumatic movement devices, a lower one, denoted by reference numeral 13 and an upper one, denoted by reference numeral 14.
  • the lower device 13 comprises a lower guide and slide assembly 15 ( Fig. 2 ) which, in turn, comprises a rectilinear guide 16 permanently connected to the frame 12 and extending parallel to the longitudinal direction 6 and a slide 18.
  • the slide 18 is coupled to the guide 16 so as to be able to slide in a direction parallel to the longitudinal direction 6.
  • Integrally connected to and carried by the slide 18 is a rectilinear guide 19 of an upper assembly 20 for guiding and sliding the upper device 14.
  • the guide 19 extends in a rectilinear transverse direction 21 orthogonal to the longitudinal direction 6 and to the slide 16 and carries coupled thereto a slide 22 able to move in opposite directions along said transverse direction 21.
  • a vertical rectilinear guide 25 is permanently connected to the slide 22, extends upwards and carries, slidingly coupled thereto, a slide 26, able to move in opposite directions from and towards the slide 22 in a direction 27 orthogonal to the directions 6 and 21 driven by a motor 28 integral with the guide 25.
  • an arm 30 is permanently connected, in a known manner, to the slide 26 and extends in a cantilevered manner from the slide 26 and carries, coupled to a free end portion, a grinding head 31.
  • the grinding head 31 comprises a support 32 permanently connected to the arm 30, a vertical wheel shaft 33, which is rotatably coupled to the support 32 in a vertically fixed position and is able to rotate about its vertical axis 33A driven by a motor 34 coupled to the shaft 33 directly or by means of a known transmission, as in the example that is illustrated.
  • a grinding wheel 35 and a polishing wheel 36 arranged on top of the grinding wheel 35 are fitted to a lower end section of the shaft 33 in a known manner.
  • the motor 34 is electrically connected to a numerical control unit 37, of a type known in the prior art and not described in detail, which is part of the assembly 10 and also controls the motor 28.
  • the unit 37 comprises a selection block 38 for selecting one or the other of the wheels 35,36 depending on the machining process to be performed on the sheet 2.
  • the slides 18 and 22 are moved in opposite directions along the respective guides 16, 19 by respective configurable electro-pneumatic drive devices, denoted by reference numerals 39 and 40, respectively, both controlled by the unit 37.
  • the device 39 comprises a drive screw 41 housed inside the guide 16 parallel to the direction 6 and rotatably coupled to said guide 16 in an axially fixed position by means of a pair of end bearings.
  • the screw 41 is turned in opposite directions by a geared motor 42 of a type known in the prior art, having an electric motor 43 controlled by the numerical control unit 37.
  • a nut-screw 45 carrying, integrally connected to an axial end thereof, a tubular sleeve 46 surrounding the screw 41 with radial clearance ( Figure 3 ).
  • An end section of the sleeve 46 defines the rod 47 of a double-acting pneumatic cylinder 48, which is part of the device 39 and extends coaxially with the axis 41A of the screw 41.
  • the pneumatic cylinder 48 comprises a liner 49, which is permanently connected to the slide 22 by means of screws, surrounds the rod 47 and has two opposite end sections, denoted by reference numerals 50 and 51, which are coupled to an outer side surface of said rod 47 in a fluid-tight manner so as to delimit with said rod an airtight chamber 52.
  • the chamber houses a plunger 53, which surrounds the rod 47 and is permanently connected to said rod 47. Conveniently, the plunger 53 is formed as one piece with the rod 47.
  • the plunger 53 divides the chamber 52 into two variable-volume airtight chambers, denoted by reference numerals 54 ( Figure 3 ) and 55 ( Figure 4 ).
  • the chambers 54 and 55 are both connected by means of ducts to a pneumatic valve assembly 56 of the type with proportional valves and controlled by the unit 44 to selectively pressurise the chambers 54 and 55 in a continuously controlled manner.
  • the device 14 is structurally and functionally identical to the device 13 and its component parts are denoted by the same reference numerals as the corresponding parts of the device 13 with the addition of the subscript "'" to distinguish them from the corresponding parts of said device 13.
  • the unit 37 and the pneumatic valve assembly 56 are common to the devices 39 and 40.
  • the assembly 1 is therefore configured as a conventional grinding assembly driven by electric motors numerically controlled by the unit 37.
  • the block 38 selects the polishing wheel 36 to polish the surfaces that have been ground by the grinding wheel 35
  • the motors 43,43' continue to displace the shaft 31 and the wheel 35 along a path identical or parallel to the grinding path
  • the chambers 55,55' are depressurised and the chambers 54,54' are pressurised, as illustrated in Figures 4 and 6 .
  • a pneumatic spring is created between the plungers 53,53' and the sections 51,51', the stiffness or elasticity of which, depending on the path along which the wheel 36 is moved, is kept constant or changed in a controlled and continuous manner by adjusting the air pressure in the chambers 54,54'.
  • the pressure in each of the chambers 54,54' can be changed by changing the output pressure from the block 56.
  • the variation in pressure in the chamber 54 can be achieved according to a principle of variation equal to or different from that of the chamber 54'. In such conditions, during polishing, the wheel 36 is pushed against the sheet 2, applying, along each of the directions 6 and 21, a respective predefined and constant force as the wear on the wheel 36 changes.
  • the air pressure in the chambers 54 and 54' is first brought to a predetermined constant value by the block 56, and, if necessary, it is adjusted by means of the motors 43,43' during the advancement of the wheel 36, that is, by modifying the instantaneous position of one or both of the plungers 53,53' in relation to a reference position, for example, the grinding position, and thus varying the volume of the chambers 54,54'.
  • the liners 49,49' of the pneumatic actuators 48,48' could be permanently connected to the respective nut screws 45,45' and the plungers 53,53' could be permanently connected to the corresponding slides 18 and 22 or in any case act directly or indirectly on the arm 30.
  • the pneumatic actuators could be arranged parallel to but in an eccentric position with respect to said directions 9 and 21.
  • the possibility of having a pressurised air chamber interposed along each of the directions between the corresponding electric motor, and of using said chamber as a pneumatic pressure spring to push the polishing wheel 36 means that any of the ground surfaces on the sheet can be polished with the polishing wheel 36 always in the condition called for in the project while therefore constantly maintaining a high production output and the required surface quality. In such conditions, the pushing force is not controlled by the electric motor but by the pneumatic springs.
  • the assembly 10 described herein is an independent grinding and finishing unit, not only is it suitable for use on bilateral machines other than the one described herein, but also on other non-bilateral grinding machines, such as rectilinear machines or machining centres. In the case of rectilinear machines, the assembly must clearly be turned so that the transverse direction is arranged vertically.

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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)
  • Polishing Bodies And Polishing Tools (AREA)
EP20159921.4A 2019-02-28 2020-02-27 Verfahren und anordnung zum schleifen und polieren einer ecke einer glasscheibe Active EP3702103B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000002925A IT201900002925A1 (it) 2019-02-28 2019-02-28 Metodo e gruppo di molatura e lucidatura di uno spigolo di una lastra di vetro

Publications (2)

Publication Number Publication Date
EP3702103A1 true EP3702103A1 (de) 2020-09-02
EP3702103B1 EP3702103B1 (de) 2023-03-29

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Family Applications (1)

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EP20159921.4A Active EP3702103B1 (de) 2019-02-28 2020-02-27 Verfahren und anordnung zum schleifen und polieren einer ecke einer glasscheibe

Country Status (3)

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EP (1) EP3702103B1 (de)
ES (1) ES2942911T3 (de)
IT (1) IT201900002925A1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112388428A (zh) * 2020-10-04 2021-02-23 关海洋 一种不锈钢板毛边处理装置
CN113579976A (zh) * 2021-09-29 2021-11-02 佛山远钧智慧科技有限公司 一种磨削抛光一体式机床
CN113977390A (zh) * 2021-11-24 2022-01-28 慈溪市海量玻璃技术有限公司 一种玻璃的倒角装置
CN114536176A (zh) * 2022-03-29 2022-05-27 武汉江丰电子材料有限公司 一种靶材r角半自动抛光系统装置、抛光方法及用途

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0689899A1 (de) * 1994-06-28 1996-01-03 BOTTERO S.p.A. Vorrichtung zum Schleifen von Glasscheiben
EP2246152A1 (de) * 2009-04-29 2010-11-03 Bottero S.p.A. Kantenabschräganordnung zum Abschrägen von Kanten von Glasplatten
CN105382656B (zh) * 2015-12-11 2017-12-01 佛山山夏自动化机械有限公司 连线玻璃自动倒角机及倒角方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0689899A1 (de) * 1994-06-28 1996-01-03 BOTTERO S.p.A. Vorrichtung zum Schleifen von Glasscheiben
EP2246152A1 (de) * 2009-04-29 2010-11-03 Bottero S.p.A. Kantenabschräganordnung zum Abschrägen von Kanten von Glasplatten
CN105382656B (zh) * 2015-12-11 2017-12-01 佛山山夏自动化机械有限公司 连线玻璃自动倒角机及倒角方法

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112388428A (zh) * 2020-10-04 2021-02-23 关海洋 一种不锈钢板毛边处理装置
CN112388428B (zh) * 2020-10-04 2022-09-16 嘉兴优佳金属制品有限公司 一种不锈钢板毛边处理装置
CN113579976A (zh) * 2021-09-29 2021-11-02 佛山远钧智慧科技有限公司 一种磨削抛光一体式机床
CN113977390A (zh) * 2021-11-24 2022-01-28 慈溪市海量玻璃技术有限公司 一种玻璃的倒角装置
CN114536176A (zh) * 2022-03-29 2022-05-27 武汉江丰电子材料有限公司 一种靶材r角半自动抛光系统装置、抛光方法及用途

Also Published As

Publication number Publication date
IT201900002925A1 (it) 2020-08-28
ES2942911T3 (es) 2023-06-07
EP3702103B1 (de) 2023-03-29

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