EP3689542A1 - Verfahren zum schleifen und polieren von glasscheiben - Google Patents

Verfahren zum schleifen und polieren von glasscheiben Download PDF

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Publication number
EP3689542A1
EP3689542A1 EP20155015.9A EP20155015A EP3689542A1 EP 3689542 A1 EP3689542 A1 EP 3689542A1 EP 20155015 A EP20155015 A EP 20155015A EP 3689542 A1 EP3689542 A1 EP 3689542A1
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EP
European Patent Office
Prior art keywords
grinding
polishing
wheels
limit value
wheel
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
EP20155015.9A
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English (en)
French (fr)
Other versions
EP3689542B1 (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 of EP3689542A1 publication Critical patent/EP3689542A1/de
Application granted granted Critical
Publication of EP3689542B1 publication Critical patent/EP3689542B1/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
    • B24B9/002—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
    • 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
    • B24B49/10—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 involving electrical means
    • 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
    • B24B49/16—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 load
    • 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
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • 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

  • This invention relates to a method for grinding and polishing glass sheets.
  • this invention relates to a method for grinding and polishing perimeter or lateral surfaces of a glass sheet, i.e. those surfaces that extend orthogonally to the extended surfaces of the same glass sheet.
  • the so-called "bilateral" machines belong to a first type. With these, the sheets are fed flat and the opposite perimeter surfaces thereof are ground simultaneously and progressively 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 progressively feeding the perimeter surfaces onto an underlying row of grinding wheels, which are also arranged in a grinding station of the machine.
  • each row of wheels comprises a plurality of grinding wheels and a plurality of polishing wheels arranged downstream of the grinding wheels to polish the surfaces grounded by the grinding wheels.
  • Both the grinding and polishing wheels rotate around their respective rotation axes, each under the thrust of a corresponding electric drive motor.
  • Each grinding wheel is arranged in its own operative grinding position to remove a pre-set portion of glass from the sheet, while each polishing wheel is constantly thrust against a corresponding perimeter surface that has previously been ground so as to polish the corresponding perimeter surface itself.
  • Both grinding and polishing wheels are different both in terms of the abrasive capacity thereof and in terms of the abrasive material and/or matrix wherein this abrasive material is dispersed. This is due to the fact that each wheel supplier offers wheels of their own design and with their own features. The user generally uses wheels from different suppliers depending on the processing to be carried out on the glass sheet.
  • both abrasive and polishing wheels progressively wear out over time but in a different way from each other, precisely because of their different designs.
  • a machine safety device or rather a protection device, for the electric motor(s) of the grinding wheel(s) concerned, automatically intervenes.
  • This safety device isolates the electric motors and, at the same time, stops the entire machine, effectively blocking production.
  • Stopping the machine is absolutely to be avoided because the subsequent restart requires that all of the sheets, even a few dozen, present in the machine be removed.
  • This removal as well as requiring an extremely long time since the machine must first be secured and then brought into an "opening" or "processing sheets extraction” condition, leads, at the same time, to a considerable loss of sheets from the batch being processed.
  • the sheets, all already partially processed, must, in fact, be thrown away and reintegrated with other sheets to ensure the expected number of sheets in the batch. All the operations described above significantly increase the batch's production time and cost, with obvious economic losses.
  • edge grinding and polishing wheels as the machine also has an edge grinding assembly.
  • the purpose of this invention is to provide a method for grinding and polishing glass sheets, which avoids the removal of sheets being processed on the machine and the discarding of sheets, or pieces of sheets, already partially processed due to the machine's being unexpectedly stopped when abnormal grinding and/or polishing conditions occur.
  • a method for grinding and polishing glass sheets comprising the steps of feeding a succession of glass sheets in a longitudinal direction at a given speed rate; progressively grinding at least one perimeter surface of the glass sheets by means of one or more grinding wheels independent of one another, the grinding comprising the step of rotating each grinding wheel about a rotation axis thereof by means of a respective grinding electric motor and by moving each sheet and the grinding wheel or wheels relative to one another at a given relative grinding speed; and polishing the ground surface with said grinding wheel or wheels by means of one or more polishing wheels rotated about the respective axes by respective polishing electric motors; the polishing comprising the step of exerting a predefined thrust action directed towards said glass sheet on each polishing wheel and moving each sheet or polishing wheel or wheels relative to one another at a respective polishing speed; the method further comprising a control step, in turn, comprising the step of detecting the current absorbed by at least a first of the electric motors during the processing of said sheets, and being characterized in that said
  • reference number 1 indicates, as a whole, a machine for grinding and polishing glass sheets 2: flat, rectangular glass sheets with two opposing, extended, flat surfaces, indicated with 3, and four consecutive, flat perimeter or lateral surfaces, one of which is indicated with reference number 5, in the illustrated example.
  • the machine 1 can, equally, be a bilateral machine, i.e. with sheets 2 fed flat, or a straight machine, i.e. with sheets 2 fed edgeways. It comprises a stiff, straight structure 6, and a motorized sheet conveying assembly 7, known in itself and partially visible in the attached figures, to feed a succession 8 of sheets 2 to be ground along a straight path 6A.
  • the assembly 7 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.
  • the conveyor 11 moves the sheets 2 to be ground through a station 13 for grinding and polishing the perimeter surfaces 5 arranged along the feeding path 6A, taking the sheets 2 from one entrance 14 to the station 13.
  • the conveyor 11 also feeds the sheets 2 through an additional grinding and polishing station 15, which is arranged downstream of the station 13 in a feeding direction K for the sheets 2 and in which the edges 5A of the sheets 2 are ground and polished.
  • the conveyor 11 is commanded and controlled by an electronic command and control unit 16 for feeding the sheets 2 at a pre-set, constant speed chosen, for example, according to the thickness of the glass, the degree of finish, and the number of wheels used.
  • 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 electronic unit 16.
  • the station 13 houses a row 18 of abrasive assemblies, known in themselves, which are independent of one another and arranged side-by-side in a direction parallel to the path 6A.
  • the row 18 of abrasive assemblies comprises a set A of grinding assemblies 19, and a set B of polishing assemblies 20, which polish the surfaces 5 ground by the set A.
  • Each of the grinding assemblies 19 is a unit independent of the other units and comprises a grinding wheel 22, which has an abrasive surface 22A thereof and is rotated about an axis M thereof that is orthogonal to the path 6A by a respective electric motor 23 commanded by the electronic unit 16.
  • Each abrasive wheel 22A 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 16.
  • Each of the polishing assemblies 20 is an independent unit and comprises a respective polishing wheel 27, which has a polishing surface 27A thereof and is rotated about an axis N thereof that is orthogonal to the path 6A by a respective electric motor 28 commanded by the electronic unit 16.
  • the wheel 27 of each assembly 20 is mounted on a relative mobile slide 26 in a direction parallel to the axes N.
  • Each slide 26 is driven by its own actuator 29, for example, a pneumatic cylinder controlled by a proportional solenoid valve controlled by the electronic unit 16 to push the polishing surface 27A of the corresponding wheel 27 against the surface 5 of the sheets 2.
  • the machine 1 comprises an edge 5A grinding and polishing assembly 30.
  • the assembly 30, which is known in itself and not described in detail, comprises a shaft 31, which is driven by means of an electric motor 32 and has two wheels, known in themselves, that are coupled together. One of the latter is a grinding wheel, indicated with 33, and one a polishing wheel, indicated with 34.
  • the shaft 31 is carried by a motorised slide, which is mobile in two directions orthogonal to each other and one of which is parallel to the path 6A to move the wheels 33,34 with respect to a sheet to be processed at a pre-set relative speed, which is generally constant. According to a different production method, the machine 1 does not have the assembly 30.
  • the electronic unit 16 comprises a detecting block 35 to detect the instantaneous absorbed current value for each of the electric motors 23, 28, and 32.
  • the electronic unit 16 also comprises a memory block 36 in which an absorbable current limit value of the respective electric motor is stored for each grinding wheel and for each polishing wheel.
  • Each absorbable current limit value is determined experimentally by considering the chemical-physical features of the glass sheets 2, the features of the wheels used, such as the type and concentration of the abrasive grain and/or the type of matrix wherein the abrasive material is included, and the expected amount of material to be removed in order to obtain an optimal ratio between abrasive/polishing activity and wear.
  • the absorbable current limit value also takes into account the value of the polishing wheel thrust force against the surface 5 of the sheet 2.
  • the absorbable current limit values are all lower than a safety limit value, at the occurrence of which the machine 1 is stopped by a motor protection and machine safety device, indicated by the reference number 39.
  • the thrust values of each of the polishing wheels are stored in a block 40 of the electronic unit 16.
  • the electronic unit 16 comprises a comparator block 41 that continuously compares the absorbed current value for each electric motor and the corresponding stored absorbable current limit value.
  • the electronic unit 16 In use, starting from a condition wherein the sheets 2 are fed along the path 6A and progressively ground by the grinding assembly A and then polished by the polishing assemblies B, the electronic unit 16 detects the values of current absorbed by each of the motors 23 and 28. If, during a control step, none of the absorbed current values exceeds the corresponding stored absorbable current value, the grinding and polishing process continues in the ordinary manner.
  • the electronic unit 16 continues the control step and intervenes, in an automatic manner, by reducing the speed rate of the sheets 2, if the threshold exceedance concerns a grinding wheel, or by reducing the thrust action of the wheel against the sheet 2, if the threshold exceedance concerns a polishing wheel.
  • the reduction in the speed rate of the glass sheets 2 translates into a reduction in the quantity of material removed from the individual grinding wheel, since the removal capacity of a grinding wheel is expressed in cubic centimetres over the unit of time, which is equivalent to the wheel-sheet contact surface expressed in square centimetres for the speed rate of the glass sheets 2.
  • reducing the thrust action of the polishing wheels 27 is equivalent to reducing the aggressiveness of the polishing action.
  • the same electric motor can always rotate the same wheel, or any wheel of a series or family of wheels that are equal or different in terms of size, and/or constructively different from each other with regard to the matrix, the abrasive material, and the concentration of the abrasive material itself in the matrix and, more generally, wheels from different wheel suppliers.
  • a plurality of identification codes is stored in the memory block 36, each of which identifies one of the wheels in the series of wheels and, for each of the same wheels, a corresponding absorbable current limit value for the electric motor is also stored.
  • the electronic unit 16 conveniently comprises a keyboard 42, by means of which an operator, noting the wheel associated with the electric motor, selects one of the stored identification codes and consequently communicates to the comparator block 41 the corresponding absorbable current limit value to be used in the comparison.
  • the electronic unit 16 itself comprises a detector block 43 that automatically and autonomously detects the wheel of the series of wheels driven by the electric motor and sends a corresponding signal to the comparator block 41.
  • the reduction in thrust can also be applied to the polishing wheel 34 of the assembly 30 for processing the edges 5A, while an increase in the current absorbed by the motor 32 during the operation of the grinding wheel 33 can be limited by progressively reducing the speed at which the grinding wheel moves with respect to the sheet, i.e. by reducing the relative speed of the grinding wheel-sheet, which, for practical purposes, is equivalent to the slowing down of the glass sheets 2 in the grinding assemblies A for the surfaces 5A.
  • the grinding and polishing method described above applies, irrespective of the devices used, either to adjust the position of the wheels 22 or to move the wheels 33 and 34 in relation to the sheet, and to push the wheels 27 or wheel 34 towards the ground surface and the surface to be polished.
  • grinding wheels 22 can be moved to and from the sheet by manual devices as well, while the polishing wheels 27, 34 can be thrust by mechanical springs, with the possibility of varying the pre-load thereof, or by torque controlled electric motors.

Landscapes

  • 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)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
EP20155015.9A 2019-01-31 2020-01-31 Verfahren zum schleifen und polieren von glasscheiben Active EP3689542B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102019000001427A IT201900001427A1 (it) 2019-01-31 2019-01-31 Metodo per la molatura e la lucidatura di lastre di vetro

Publications (2)

Publication Number Publication Date
EP3689542A1 true EP3689542A1 (de) 2020-08-05
EP3689542B1 EP3689542B1 (de) 2023-03-01

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ID=66380009

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EP20155015.9A Active EP3689542B1 (de) 2019-01-31 2020-01-31 Verfahren zum schleifen und polieren von glasscheiben

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EP (1) EP3689542B1 (de)
ES (1) ES2942893T3 (de)
IT (1) IT201900001427A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4023392A1 (de) * 2020-12-28 2022-07-06 Tecnomec Borghi S.r.l. Vorrichtung zum entgraten und beschneiden der kanten von plattenförmigen gegenständen

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
JP2003117815A (ja) * 2001-10-16 2003-04-23 Central Glass Co Ltd ガラス板周縁部の研磨異常の検出方法
EP2666591A1 (de) * 2011-01-21 2013-11-27 JTEKT Corporation Verfahren zur überwachung von schleifanomalien und vorrichtung zur überwachung von schleifanomalien

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
JP2003117815A (ja) * 2001-10-16 2003-04-23 Central Glass Co Ltd ガラス板周縁部の研磨異常の検出方法
EP2666591A1 (de) * 2011-01-21 2013-11-27 JTEKT Corporation Verfahren zur überwachung von schleifanomalien und vorrichtung zur überwachung von schleifanomalien

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4023392A1 (de) * 2020-12-28 2022-07-06 Tecnomec Borghi S.r.l. Vorrichtung zum entgraten und beschneiden der kanten von plattenförmigen gegenständen

Also Published As

Publication number Publication date
IT201900001427A1 (it) 2020-07-31
EP3689542B1 (de) 2023-03-01
ES2942893T3 (es) 2023-06-07

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