US20170217818A1 - Method for breaking out a sheet of glass - Google Patents

Method for breaking out a sheet of glass Download PDF

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Publication number
US20170217818A1
US20170217818A1 US15/328,170 US201515328170A US2017217818A1 US 20170217818 A1 US20170217818 A1 US 20170217818A1 US 201515328170 A US201515328170 A US 201515328170A US 2017217818 A1 US2017217818 A1 US 2017217818A1
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United States
Prior art keywords
glass
sheet
local pressure
pressure means
breaking
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.)
Abandoned
Application number
US15/328,170
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English (en)
Inventor
Thierry Dumenil
Dominique Bureloux
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.)
Saint Gobain Glass France SAS
Compagnie de Saint Gobain SA
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Saint Gobain Glass France SAS
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Filing date
Publication date
Application filed by Saint Gobain Glass France SAS filed Critical Saint Gobain Glass France SAS
Assigned to SAINT-GOBAIN GLASS FRANCE reassignment SAINT-GOBAIN GLASS FRANCE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DUMENIL, THIERRY, BURELOUX, DOMINIQUE
Publication of US20170217818A1 publication Critical patent/US20170217818A1/en
Priority to US16/680,904 priority Critical patent/US11084752B2/en
Abandoned legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/04—Cutting or splitting in curves, especially for making spectacle lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
    • B28D1/225—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising for scoring or breaking, e.g. tiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
    • B28D7/04—Accessories specially adapted for use with machines or devices of the preceding groups for supporting or holding work or conveying or discharging work
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
    • C03B33/0235—Ribbons
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
    • C03B33/03—Glass cutting tables; Apparatus for transporting or handling sheet glass during the cutting or breaking operations
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/023—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor the sheet or ribbon being in a horizontal position
    • C03B33/033—Apparatus for opening score lines in glass sheets

Definitions

  • the present invention relates to the field of breaking out a sheet of glass, more particularly of breaking out a complex shape from a sheet of glass.
  • FIGS. 1 a and 1 b For simple shapes with straight edges that do not penetrate inside the shape (no concavity on the shape), it is possible to use a rectilinear reverse breakout technique illustrated in FIGS. 1 a and 1 b. This involves making a rectilinear cross score, which means to say scoring from one edge to the other ( FIG. 1 a ), then placing the entire fissure in extension by lifting the sheet of glass along the entire length of the fissure, using a bar ( FIG. 1 b ) or one or more point contacts.
  • the starting point is a sheet of glass of dimensions greater than the shape that is to be cut out. This sheet is known as the primitive and is generally in the shape of a trapezium. The various stages of cutting out are illustrated in FIGS. 2 a - 2 d.
  • the starting point is a primitive in the shape of a square ( FIG. 2 a ), a rectangle or a trapezium.
  • the contour of the shape that is to be cut out is traced ( FIG. 2 b ) for example using a glass-cutting wheel. Additional scores in the form of straight segments are positioned around the periphery of the shape that is to be cut out. These segments are referred to as the relief cuts and allow that part of the primitive that is situated outside of the shape that is to be cut out to be broken out correctly.
  • the shape that is to be cut out is then isolated from the offcuts of the primitive ( FIG. 2 d ).
  • the breaking out is performed using a technique of locally bending the initial fissure by applying pressure to the offcut or alternatively by taking hold of the offcut.
  • the bending is applied by a lever-arm mechanism pressing against the sheet of glass, on the outside of the shape and at a limited number of points, on a hard or soft covering.
  • FIGS. 3 a to 3 d are diagrams in cross section of the breaking out of a sheet of glass by applying bending to an initial fissure of complex shape by bending the part external to the shape that is to be cut out.
  • FIGS. 3 a and 3 b relate to the circumstance in which breaking out is performed on a soft belt. Force is applied to the offcut by pressing on it until it breaks and the offcut is separated.
  • FIGS. 3 c and 3 d relate to an example of breaking out on a hard belt.
  • the sheet of glass is positioned with an overhang so that a force applied to the offcut by pressure or by gripping allows the sheet of glass to be deformed until it breaks.
  • Adjusting the pressure points may solve this problem but this remains a difficulty.
  • one subject of the invention is a method for breaking out a complex shape from a sheet of glass, comprising:
  • This method makes it possible to reduce the sacrificial area of glass between two volumes. It is even conceivable for several components to be cut from the same large-sized sheet of glass, with components which may touch at certain points. It then becomes conceivable to cut with maximum imbrication of shapes and a very substantial reduction in offcuts.
  • More complex cutouts may also be achieved, particularly “re-entrant” cutouts, and cutouts for thick glass, and with good yield.
  • this breaking out technique can be incorporated into an existing line.
  • a planar-support means is positioned on the score line side, facing the local pressure means during the breaking-out step.
  • planar-support means forms a counter support generating a counter force that opposes the force with which the local pressure means is pressed during the breaking-out step.
  • the counter force may result from the weight of the sheet of glass itself, when this weight is sufficiently great.
  • the tracing step and the breaking-out step are performed without turning the sheet of glass over in between.
  • the score line is produced from the top at the surface of the glass and the local pressure means is applied from the bottom to the opposite face of the glass, or vice-versa. The sheet of glass is not turned over between the two steps.
  • the method also has one or more of the following features considered alone or in any technically feasible combination:
  • Another subject of the invention is a method for manufacturing a plurality of glazings of complex shape from a large-sized rectangular sheet of float glass having at least one dimension corresponding to the width of the ribbon of float glass from which it is produced, using the method as claimed in any one of the preceding claims to cut out at least part of said glazings.
  • the method of manufacture comprises:
  • the method comprises:
  • the method of manufacture also has one or more of the following features considered alone or in any technically feasible combination:
  • Another subject of the invention is a machine for breaking out a complex shape from a sheet of glass, comprising:
  • the breaking-out machine further comprises a planar-support means against said first face of the sheet of glass, opposite the local pressure means.
  • FIGS. 6 a -6 c schematically illustrate a method according to one particular embodiment of the invention, consisting first of all of a step of tracing a score line 2 , which means to say of creating a fissure on a first face 4 A of the sheet of glass 4 , followed by a step of turning the sheet of glass over for the purposes of a subsequent step of applying local pressure opposite the fissure, on the opposite face 4 B to the first face.
  • the traced score line corresponds for example to the contour of the complex shape that is to be cut out, without relief cuts.
  • a “complex shape” is intended to mean a curved line, or a succession of lines at least some of which are non-rectilinear, or rectilinear lines with changes in direction forming at least one concave part.
  • Two shapes that are imbricated means that a convex part of one encroaches into a concave part of the other, i.e. the contour of the two shapes cannot be separated by a straight line.
  • Two shapes are understood to be tangential when they have a part of their contour in common.
  • the sheet of glass to be cut is planar.
  • the score line is traced for example using a glass-cutting wheel 6 or any other suitable scoring tool such as a laser for example.
  • the score line 2 is a fissure intended to allow breaking out along this line during the breaking-out step. This then is a partial cut, i.e. a cut through just part of the thickness of the sheet of glass. This is what is meant by a “score line” throughout this text.
  • the first face 4 A of the sheet of glass 4 is pressed against a planar-support surface 8 .
  • This for example is a soft belt.
  • the deformability of the planar-support surface 8 is chosen in such a way as to control the field of stresses applied by the local pressure means. Controlling the field of stresses allows control over the length over which the fissure spreads.
  • the objective is for the fissure to spread to a predetermined length according to the shape that is to be cut out. The smaller the local radius of curvature, the smaller will be the chosen length for the fissure. If the fissure spreads too rapidly, the surface will need to be chosen to be less deformable or the pressure applied will need to be lower. If the fissure spreads too slowly, a more deformable surface or higher pressure will need to be chosen.
  • Breakout tool wheel type, diameter: 5 mm, width: 1 mm
  • felt belt hardness 45-52 shore.
  • the local pressure means 10 is, for example, a ball of any suitable type, or another local pressure means of any suitable type, for example a roller, preferably a roller of toric shape.
  • the ball for example has a diameter of 1 mm.
  • the diameter is chosen of any suitable type, notably up to 10 or even 20 mm.
  • the local pressure means 10 is preferably chosen to be rigid, for example made of steel or a suitable plastic.
  • the local pressure means 10 is moved along the score line, along the entire length of the score line, preferably with pressure being continuously applied, for example of constant intensity.
  • pressure is applied continuously but with varying intensity, the intensity for example being chosen according to the local radius of curvature of the shape to be cut out and, for example, supplemented by a periodic variation in intensity, namely vibrating pressure.
  • pressure is applied discontinuously to the sheet of glass.
  • the local pressure means is moved relative to the sheet of glass. Note, however, that, as an alternative, it is the sheet of glass that is moved, or both. In general, there is a relative movement of the local pressure means 10 with respect to the sheet of glass 4 .
  • the planar-support surface 8 is, for example, formed by a table and therefore by a continuous planar surface.
  • the planar-support surface 8 could be not continuous. It could for example consist of a number of planar-supports obtained for example using pieces of table. What is important is that a planar support 8 , namely a support at least twice as wide as the pressure applied by the local pressure means, be provided opposite the local pressure means 10 , the reason for this being in order to obtain a clean break.
  • the turning-over step is optional. It is possible for example to use a suction table to lift up the sheet of glass 4 and thus press the local pressure means 10 against it from underneath, the first face 4 A of the sheet of glass then lying against the suction table. This is explained in greater detail hereinbelow.
  • FIGS. 7 a - 7 c, 8 a - 8 c, 9 a - 9 c and 10 a - 10 c schematically illustrate four different types of machines for implementing the method.
  • FIGS. 7 a -7 c uses a suction table 12 .
  • a sheet of glass 4 is conveyed as far as a cutting table 14 ( FIG. 7 a ).
  • a standard cutting machine 16 can therefore be used for creating a score line 2 along the contour of the complex shape that is to be obtained.
  • the suction table 12 is, for example, brought in over the cutting table 14 as illustrated in FIG. 7 b , so as to apply suction to the sheet of glass 4 via the first face 4 A thereof.
  • a third step ( FIG. 7 c ) the local pressure means 10 is brought against the opposite face 4 B of the sheet of glass 4 , opposite the score line 2 .
  • the suction table 12 may also be configured so that the offcuts fall off under gravity whereas the complex shape or shapes that have been cut out remain attached by suction to the suction table 12 and are carried further thereby, as illustrated by the right-hand diagram in FIG. 7 c.
  • the machine has at least one computer and one memory in which machine control programs are stored.
  • the programs are able to control the machine of FIGS. 7 a -7 c and more particularly to control the scoring tool 6 , the suction table 12 and the local pressure means 8 .
  • the same is true of the other machines in FIGS. 8 a - 8 c, 9 a - 9 c and 10 a - 10 c.
  • the machine of FIGS. 7 a -7 c has the advantage of not requiring the sheet of glass 4 to be transferred on a conveyor prior to breaking out and of thus avoiding a geometric readjustment in order to determine the position of the score line 2 , as well as saving space.
  • FIGS. 8 a -8 c illustrate a machine which itself comprises a conveyor 18 for transferring the sheet of glass from the location at which it is scored to the location at which it is broken out.
  • FIG. 8 a The scoring step in FIG. 8 a is similar to that of FIG. 7 a .
  • FIG. 8 b illustrates the transfer using the conveyor 18 to the breaking-out location.
  • FIG. 8 c illustrates the breaking-out step.
  • a planar-support surface 8 is applied against the first face 4 A.
  • the opposite face 4 B against which the local pressure means 10 is pressed is itself overhanging so that the region corresponding to the score line 2 is clear of the support table 20 bearing the sheet of glass 4 by what is said to be its opposite face 4 B.
  • FIGS. 9 a -9 c illustrate an alternative form of the example of FIGS. 8 a - 8 c, in which alternative form breaking out is performed through a soft conveyor belt 22 that conveys the sheet of glass. It should indeed be noted that the local pressure means 10 does not necessarily need to be in direct contact with the glass.
  • transfer may be performed by a suction table 24 .
  • FIG. 10 a illustrates.
  • FIGS. 10 a -10 c also differs from the preceding ones for other reasons.
  • the main difference is that the sheet of glass is turned during the breaking-out step, while remaining in its plane, as illustrated by FIG. 10 b . This is a rotation about a normal to the overall plane of the sheet of glass.
  • the support plate 26 supporting the sheet of glass 4 is flexible enough that the local pressure means 10 can press against the opposite face 4 B through the support plate 26 and thus break the complex sheet of glass along the contour of the complex shape.
  • a planar-support means 8 is pressed firmly against the first face 4 A of the sheet of glass, in a similar way to FIG. 8 c.
  • the local pressure means 10 is, for example, mounted with the ability to move in just two dimensions, thanks to the rotation of the sheet of glass 4 .
  • FIG. 10 c illustrates the separation of the complex shape by means of a suction table 28 .
  • it could use another means of any suitable type.
  • the cutting out of glazings of complex shape i.e. for example automotive vehicle glazing, is generally performed in two stages starting from a “large-format” sheet of glass also known as “PLF” (which stands for “Plateau Large Format”) or DLF glass.
  • PLFs are obtained directly by cross-cutting the ribbon of float glass.
  • the width of the PLFs corresponds to the width of the ribbon of float glass.
  • Their length corresponds to the length of ribbon cut.
  • DLFs are smaller sheets of glass, of which the length itself corresponds to the width of the ribbon of float glass.
  • DLFs are obtained directly by cutting the ribbon of float glass but with a cut length of ribbon that is shorter than the width of the ribbon of float glass, or alternatively are obtained by cutting the PLF transversely to the length thereof.
  • PLFs have minimal dimensions of at least 2.9 m by at least 4.7 m and DLFs have dimensions of at least 2.9 m by at least 1.3 m.
  • sheets of glass 30 of rectangular or trapezoidal shape and known as “primitives” are first of all cut from the PLFs or DLFs. These are sheets of glass of which the shape is a polygon containing the definitive glazing of complex shape 32 that is to be produced, leaving all around the periphery a “trim” 34 that is sufficient for breaking out. This is what is illustrated in FIG. 11 .
  • the glazing that is to be edged is cut to shape at a second scoring workstation which means to say that the “trims” 34 are cut off over the entire perimeter of the primitive 30 so that the edges of the glazing 32 are now ready for edging.
  • a number of score lines are, for example, created as illustrated in FIGS. 2 a -2 d for an example of a square primitive. Edging consisting in grinding is then performed later.
  • the primitives 30 are cut from the PLFs or DLFs at a first scoring workstation while the ready-to-shape glazings 34 are shaped at a second scoring workstation.
  • FIGS. 12 a -12 b illustrate examples of designs of cutout in which the continuous lines represent the shape to be cut out which is ready for shaping while the broken lines represent the score lines made at the first scoring workstation.
  • one advantage of the invention is that it allows at least some edges of complex shape to be cut at the first scoring workstation, i.e. at the workstation that cuts out the primitive 30 . Cutting edges that are ready to shape at the first scoring workstation allows the amount of offcut to be reduced by avoiding the need to provide “trims” along these edges.
  • the cutting to the shape which is ready for edging of all the contour of the glazing is carried out at the first scoring workstation (the entire contour is in a broken line 36 ).
  • FIGS. 13 a -13 b illustrate another advantage of the invention, namely that it allows complex shapes that are to be cut out to be imbricated. Such a configuration will also reduce offcuts, as will be appreciated by studying FIGS. 13 a and 13 b.
  • cutting to the shape which is ready for edging may, as explained hereinabove in respect of FIGS. 12 a and 12 b , begin right from the first scoring step at the first scoring workstation.
  • FIG. 13 a two of the edges 36 are cut at the first scoring workstation, known as the “primitives” scoring workstation even though these are no longer primitives in the strict sense of the word.
  • FIG. 13 b the cutting to the shape which is ready for edging on the entire contour of the glazing is performed entirely at the first scoring workstation, without passing via the step of scoring “primitives” in a similar way to FIG. 12 b.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US15/328,170 2014-07-24 2015-07-23 Method for breaking out a sheet of glass Abandoned US20170217818A1 (en)

Priority Applications (1)

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US16/680,904 US11084752B2 (en) 2014-07-24 2019-11-12 Method for breaking out a sheet of glass

Applications Claiming Priority (3)

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FR1457171 2014-07-24
FR1457171A FR3024136B1 (fr) 2014-07-24 2014-07-24 Procede de rompage d'une feuille de verre
PCT/FR2015/052043 WO2016012725A1 (fr) 2014-07-24 2015-07-23 Procédé de rompage d'une feuille de verre

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PCT/FR2015/052043 A-371-Of-International WO2016012725A1 (fr) 2014-07-24 2015-07-23 Procédé de rompage d'une feuille de verre

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US (2) US20170217818A1 (ko)
EP (1) EP3172174B1 (ko)
JP (1) JP2017526603A (ko)
KR (1) KR102426730B1 (ko)
CN (1) CN105451844B (ko)
BR (1) BR112017000972B1 (ko)
CA (1) CA2954462A1 (ko)
EA (1) EA201790261A1 (ko)
ES (1) ES2848399T3 (ko)
FR (1) FR3024136B1 (ko)
HU (1) HUE054001T2 (ko)
MX (1) MX2017000882A (ko)
PL (1) PL3172174T3 (ko)
WO (1) WO2016012725A1 (ko)

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US10332717B2 (en) 2016-07-26 2019-06-25 Palo Alto Research Center Incorporated Self-limiting electrical triggering for initiating fracture of frangible glass
USRE47570E1 (en) 2013-10-11 2019-08-13 Palo Alto Research Center Incorporated Stressed substrates for transient electronic systems
US10541215B1 (en) 2015-04-23 2020-01-21 Palo Alto Research Center Incorporated Transient electronic device with ion-exchanged glass treated interposer
US20200048135A1 (en) * 2016-10-10 2020-02-13 South China University Of Technology Method for micro-grinding tip-accurately induced brittle fracture forming of curved mirror surface
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US10903173B2 (en) 2016-10-20 2021-01-26 Palo Alto Research Center Incorporated Pre-conditioned substrate
US10947150B2 (en) 2018-12-03 2021-03-16 Palo Alto Research Center Incorporated Decoy security based on stress-engineered substrates
US10969205B2 (en) 2019-05-03 2021-04-06 Palo Alto Research Center Incorporated Electrically-activated pressure vessels for fracturing frangible structures
US11107645B2 (en) 2018-11-29 2021-08-31 Palo Alto Research Center Incorporated Functionality change based on stress-engineered components
US20210317030A1 (en) * 2018-12-13 2021-10-14 Meere Company Inc. Method and device for cutting structure composed of brittle material
US11252270B2 (en) 2018-04-24 2022-02-15 Kunshan Go-Visionox Opto-Electronics Co., Ltd. Display screens and methods for manufacturing display screens
US11904986B2 (en) 2020-12-21 2024-02-20 Xerox Corporation Mechanical triggers and triggering methods for self-destructing frangible structures and sealed vessels

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JP2021031357A (ja) * 2019-08-28 2021-03-01 三星ダイヤモンド工業株式会社 分断方法および分断装置
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FR3024136B1 (fr) 2021-04-30
EP3172174A1 (fr) 2017-05-31
ES2848399T3 (es) 2021-08-09
CN105451844A (zh) 2016-03-30
PL3172174T3 (pl) 2021-05-04
WO2016012725A1 (fr) 2016-01-28
FR3024136A1 (fr) 2016-01-29
EA201790261A1 (ru) 2017-06-30
JP2017526603A (ja) 2017-09-14
CN105451844B (zh) 2019-10-01
KR20170035904A (ko) 2017-03-31
BR112017000972A2 (pt) 2018-01-16
US11084752B2 (en) 2021-08-10
CA2954462A1 (fr) 2016-01-28
HUE054001T2 (hu) 2021-08-30
EP3172174B1 (fr) 2020-12-02

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