EP2753455B1 - Grinding wheel for shaping flat glass - Google Patents

Grinding wheel for shaping flat glass Download PDF

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Publication number
EP2753455B1
EP2753455B1 EP12756776.6A EP12756776A EP2753455B1 EP 2753455 B1 EP2753455 B1 EP 2753455B1 EP 12756776 A EP12756776 A EP 12756776A EP 2753455 B1 EP2753455 B1 EP 2753455B1
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EP
European Patent Office
Prior art keywords
grinding wheel
shaping
glass
diamonds
binder
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.)
Active
Application number
EP12756776.6A
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German (de)
French (fr)
Other versions
EP2753455A1 (en
Inventor
Dominique Bureloux
Thierry Dumenil
Sébastien WERY
Adeline GIROD
John Tunstall
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
Original Assignee
Saint Gobain Glass France SAS
Compagnie de Saint Gobain SA
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.)
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Publication date
Application filed by Saint Gobain Glass France SAS, Compagnie de Saint Gobain SA filed Critical Saint Gobain Glass France SAS
Priority to PL12756776T priority Critical patent/PL2753455T3/en
Publication of EP2753455A1 publication Critical patent/EP2753455A1/en
Application granted granted Critical
Publication of EP2753455B1 publication Critical patent/EP2753455B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
    • B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
    • 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
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material
    • B24D9/10—Circular back-plates for carrying flexible material with suction means for securing the material
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]

Definitions

  • the present invention relates to a new glass forming grinding wheel, in particular so-called 'flat' glass (sheet glass or glazing, whether the sheet is flat or curved in particular), in particular so-called “thin” glass (of lower thickness or equal to 2.6 mm, in particular less than or equal to 2.1 mm), and where appropriate of the so-called “thick” glass, that is to say with a thickness greater than 2.6 mm (in particular between 2.6 mm and 4 mm). ), especially in the automotive field, said grinding wheel being intended in particular for shaping vehicle glazing such as windshields, glazing for roofs or laminated side glazing, or where appropriate rear-window type, etc.
  • 'flat' glass sheet glass or glazing, whether the sheet is flat or curved in particular
  • so-called “thin” glass of lower thickness or equal to 2.6 mm, in particular less than or equal to 2.1 mm
  • the so-called “thick” glass that is to say with a thickness greater than 2.6 mm (in particular between 2.6 mm and 4 mm).
  • the invention also relates to a method of manufacturing said grinding wheel and its use for shaping glazing as mentioned above, in particular for motor vehicles, or any other glass, in particular having a thickness of less than or equal to 4 mm, in particular thickness less than or equal to 2.6 mm.
  • the invention furthermore relates to a new process for shaping glass, in particular for shaping automotive glazings, using this wheel and notably making it possible to achieve shaping speeds of greater than or equal to 30 m / min.
  • the invention relates to the field of processing flat glass. Grinding wheels have been specially developed for the automotive field, but can be used for any glass application using glasses of the same thickness. These glass-type hard material forming grinding wheels are made of abrasive materials, such as synthetic diamonds which, due to their high hardness and heat resistance properties, can cut many materials. These diamonds or abrasive materials are generally found in a matrix or binder, generally metallic (especially cobalt base), this assembly for shaping generally surrounding a central core, for example metal (in particular stainless steel or stainless steel), and also being inserted where appropriate between two metal parts may in particular strengthen its mechanical strength, facilitate its fixing, allow balancing, etc. A grinding wheel for glass is described in particular in the document US2004 / 023599 .
  • the shaping advance speed (in m / min)
  • the quality of the shaping joint (evaluated by observing the concentration and size of the scales induced by shaping , the quality of the seal requested depending on the specifications set by the car manufacturer and being evaluated in the present application by a reference device GQM marketed by the company Bystronic Maschinen AG, this device calculating the size and concentration of the scales), the durability of the grinding wheel, and the frequency of grinding of the grinding wheel (the brightening generally consisting in cleaning the grinding wheel and resurfacing the diamonds, this operation inducing a loss of time and abrasive wear of the grinding wheel. its metallic binder).
  • the shaping advance speed is usually less than or equal to 20 - 22 m / min on average, and the brightening frequency is generally of the order of brightening every 90 to 135 m of shaped glass (ie all 20 or 30 glasses for glass perimeters of the order of 4.5 m).
  • the present invention has therefore sought to develop a new glass forming grinding wheel, particularly flat, including thin glass, or thick glass, adapted to the automotive field in particular, allowing among other things the shaping of monolithic glasses used in laminated glazing such as windshields, laminated glazing for roofs or automotive side laminated glazing, or the shaping of any other glass (or glass material) with a thickness of not more than 4 mm, in particular thickness less than or equal to 2.6 mm (thin glass), or even less than or equal to 2.1 mm, said grinding wheel making it possible to increase the forming feedrate (in particular to obtain a forming feedrate) greater than or equal to 30m / min), without however presenting the disadvantages or incompatibilities seen previously, in particular making it possible to maintain a good quality of the forming joint (in particular a number of visible defects, ie a number of defects greater than 250 ⁇ m in length on the surface of the glass, less than 7 per decimeter), while offering a service life equal to at least 50 km of shaped joint, with a bright
  • a shaping wheel intended for shaping glass, in particular flat glass, with a thickness of less than or equal to 4 mm, in particular with a thickness of between 1.6 and 3.85 m, and particularly of thin glass, with a thickness of less than or equal to 2.6 mm, in particular with a thickness of between 1.6 and 2.6 mm, but also, where appropriate, thick glass, of a thickness in particular of between 2.6 and 3.85 mm, this wheel being suitable and advantageously intended for high speed forming, this grinding wheel comprising at least one abrasive portion for forming, said abrasive portion being formed of at least one metal binder (at least one metal, which binder is advantageously an alloy in the present invention) and diamonds distributed in the binder, said binder having a Rockwell B hardness of between 95 and 105 and being based on tungsten, and diamonds having a size of between 75 and 95 ⁇ m and a concentration of between 2.2 ct / cm 3 and 2.64 ct
  • Bronze is formed for 75 to 85% by weight of copper and for 15 to 25% by weight of tin.
  • the grinding wheel according to the invention is particularly suitable for shaping flat glass, as indicated above, especially flat glass from a float (or obtained by float process), in particular sheet glass or glazing used in the automotive field, and in particular for shaping thin glass, with a thickness of less than or equal to 2.6 mm, in particular less than or equal to 2.1 mm (especially shaping of laminated glazings intended to form windshields, roofs or laminated sides, etc.), but where appropriate it is also suitable with advantages for shaping thick (flat) glass, in particular between 2.6 and 4 mm thick, in particular between 2.6 and 3.85 mm (shaping of glass sheets or glazings used as monolithic glasses in the automotive field to form for example rear glasses, roofs, automotive side windows, etc.).
  • the grinding wheel according to the invention is particularly advantageous because it makes it possible to form at speeds of advance equal to at least 30 m / min, while maintaining a good seal quality, a brightening frequency not exceeding brightening all the 90 m and a lifetime equal to at least 50 km of shaped glass.
  • the combination of features mentioned in the definition of the invention makes it possible to increase the forming speed without suffering the aforementioned drawbacks.
  • the grinding wheel according to the invention is generally in the form of a disc having a diameter of between 130 and 250 mm, for example of the order of 150 mm, formed of a central (annular) central core (for example made of stainless steel or stainless steel) and a peripheral crown (or ring) (surrounding the core on the edge) having a portion (usually median) abrasive, embedded between two metal parts (usually stainless steel as the core).
  • a central (annular) central core for example made of stainless steel or stainless steel
  • a peripheral crown (or ring) surrounding the core on the edge having a portion (usually median) abrasive, embedded between two metal parts (usually stainless steel as the core).
  • the wheel is obtained by assembling the metal parts, already having essentially shaped (all the aforesaid parts except the abrasive part), and adding in the space between the peripheral metal parts, the abrasive mixture (the binder, in the form of a mixture of metal powders, and diamonds), then heating the assembly under pressure to effect the sintering of the binder and the cohesion of the different parts together.
  • the abrasive mixture the binder, in the form of a mixture of metal powders, and diamonds
  • One or more profiles (usually two or more profiles are provided in the thickness or on the edge of the abrasive part) suitable for the intended shaping (for example at least one profile required to obtain a rounded edge on the edge of a glazing unit ) can then be given to the abrasive part on its apparent edge, for example by electroerosion, these profiles being subsequently revived or maintained using appropriate brightening sticks (these sticks are generally based on alumina).
  • the thickness of the abrasive part for the preferred automotive applications referred to is generally between 6.4 and 10 mm, the depth of the abrasive part inside the grinding wheel (up to the metal core) being generally of the same order (between 6.4 and 10 mm).
  • the binder of the abrasive part is chosen so as to have a Rockwell hardness B of between 95 and 105, this hardness being measured according to EN ISO 6508-1, the hardness being linked in particular to the composition of the binder and influencing especially on the life of the grinding wheel and the frequency of brightening.
  • the binder is based on tungsten, tungsten being its major component, the binder in particular being formed (from) at least 58% (and preferably at least 59%). %, in particular at least 60%, in particular at least 61%) and preferably at most 75% by weight of (tungsten) powder, the size of the tungsten particles / of said powder not exceeding advantageously 100 ⁇ m.
  • the binder is obtained from the mixture of the following components (metals), their cohesion in particular being obtained by sintering as mentioned above): - (powder of) tungsten 58-75%, especially 59-75%, - (powder of) bronze 30-37%, especially 28-33% - (powder of) chrome 0.5-5%, especially around 1% - (powder of) nickel 0.5-5%, in particular about 1%, the bronze being formed for 75 to 85% by weight of copper and for 15 to 25% by weight of tin, in particular formed of about 80% of copper and 20% of tin.
  • the size of the bronze particles is advantageously chosen to be less than 100 ⁇ m, that of the chromium particles is chosen to be less than 50 ⁇ m, and that of the nickel particles is chosen to be less than 50 ⁇ m.
  • the tungsten content may be higher if it is used for shaping thick glass than for thin glass in the present invention, for example being of the order of 61 to 75%, for example of the order of 65 to 65%. 70%, in the case of thick glass in particular, or may be rather of the order of 59 to 70%, for example of the order of 59 to 65%, in particular in the case of thin glass.
  • the binder thus selected contributes in particular to obtain the brightening frequency and the desired lifetime.
  • the diamonds present in the abrasive part are generally synthetic. Their size (expressed as the arithmetic average of the diameters of the circles or spheres in which the diamonds are inscribed and generally evaluated by screening, in particular according to the ANSI B74-16 or FEPA standard) is chosen in the present invention between 75 and 95 ⁇ m ( or between 180 and 240 mesh, the correspondence between the mesh size and the size in ⁇ m being evaluated according to the FEPA (European Federation of Abrasive Manufacturers) standard).
  • the concentration of said diamonds according to the invention (generally evaluated by weighing during the manufacture of the grinding wheel) is also between 2.2 ct / cm 3 (that is to say, karats per cm 3 ) and 2.64 ct / cm.
  • the diamonds are chosen provided (for the majority of them, particularly at less than 90% and preferably 100%) of at least one coating (in particular one or more layers) of titanium or, if appropriate, titanium-based, the titanium content being preferably between 2 and 10% by weight of said titanium; coated diamond (for example being of the order of 6% by weight).
  • This coating or coating is in particular on diamonds before manufacture of the grinding wheel, for example by physical deposition under vacuum of thin film in the vapor phase (PVD deposition - or "physical vapor deposition” -, for example by sputtering) or by electrodeposition or chemical vapor deposition (CVD) on diamonds prior to their use to manufacture the wheel according to the invention.
  • PVD deposition - or "physical vapor deposition" - for example by sputtering
  • CVD chemical vapor deposition
  • the grinding wheel according to the invention makes it possible to form at speeds of advance equal to at least 30 m / min; we can call it high-speed grinding.
  • the subject of the invention is also a new method (or a new operation) for shaping glass, in particular for shaping glass sheets or glazings, in particular for automobiles such as those used to form windshields, glazings for roofs or for side windows, with a thickness of less than or equal to 4 mm, in particular less than or equal to 2.6 mm, in particular less than or equal to 2.1 mm, using the aforementioned grinding wheel and thus making it possible, in particular, to achieve forward speeds of shaping greater than or equal to 30 m / min.
  • this method is also characterized by a ratio of the rotational speed of the grinding wheel (in m / min, this rotational speed generally ranging between 2400 and 4200 m / min) on the feed speed of shaping (in m / min, that is to say in meters of glass formed per minute, this shaping advance speed generally ranging between 20 and 33 m / min, the grinding wheel according to the invention making it possible to work both at high speed and at low speed, the advantage in the latter case being in particular a significantly improved grinding wheel life) of between 60 and 180, such ratio to obtain a good efficiency of the grinding wheel according to the invention at the same time as a high speed of advance.
  • the invention also covers a method of manufacturing glazing, in particular for the automobile, in particular windshields, glazing for roofs or for side windows, incorporating a shaping operation as previously claimed according to the invention, as well as a glazing manufacturing device, incorporating the grinding wheel according to the invention.
  • the wheel according to the invention is particularly suitable for shaping the edge of the glasses, in order to give a particular profile (forming for example a rounded edge and thus eliminating sharp angles) to the edge of the glasses intended to form the desired glazing .
  • these glasses are derived especially from float processes and generally undergo the cutting and shaping operation after formation.
  • the glass sheets resulting from the float process undergo beforehand a cutting step to the desired shape, then are shaped, washed, before undergoing possibly a screen printing step, before the forming step or bending (for example by deposit on a bending frame or appropriate metal reinforcement and then passage in an oven, for example at a temperature of the order of 650 ° C), intended to give the appropriate curvature if appropriate glazing (especially for automotive applications), this forming or bending which can take place simultaneously on several sheets intended to be combined within the same laminated layer, the glass sheets thus shaped then being cooled if necessary and associated, if necessary, with one or more plastic interleaves of similar dimensions before calendering, heating, and installation of peripheral seal if necessary.
  • a coolant (particularly water with optionally one or more cooling additives) is generally used in combination with the grinding wheel at the point of contact between the grinding wheel and the glass to evacuate the glass particles and dissipate the energy produced.
  • the grinding wheel according to the invention has proved to be perfectly capable of advantageously replacing the usual grinding wheels in existing glass-making and manufacturing facilities, in particular for automobiles, since the mechanisms governing the removal of material are generally complex, the changes millstone or its environment that can significantly affect.
  • the invention also relates to a glazing, in particular a windshield, glazing for roof or automotive side glazing, obtained by the method of forming or producing glazing according to the invention, as well as a vehicle incorporating said glazing.
  • the present invention also relates to a method of producing grinding wheels according to the invention.
  • These wheels are made from the mixture of powder (s) metal (s) (to form the binder) and diamonds mentioned above in the definition of the grinding wheel according to the invention, this mixture being inserted between metal parts as mentioned above, then the formed assembly being heated to a high temperature, especially greater than 800 ° C.
  • the grinding wheel obtained is also preferentially brightened using one or two brightening sticks, identical or different, for example a stick said soft and a stick said hard, and the concentricity of the grinding wheel is checked, these two operations are generally done before the conditioning of the grinding wheel.
  • a grinding wheel according to the invention was made by inserting between a stainless steel metal part a mixture intended to form the abrasive part and then heating the assembly under pressure so as to effect the cohesion of the different parts between them, then generating a profile. for forming on the electroerosion abrasive portion, the mixture for forming the abrasive portion being formed of the following components: about 85% by volume of binder of the following composition (given by weight relative to the binder): - (powder of) tungsten: 61% - (powder of) bronze: 37% - (powder of) chrome: 1% - (powder of) nickel 1%, the bronze being formed of about 80% copper and 20% tin, this binder having a Rockwell hardness B of about 100, approximately 15% by volume of diamonds (concentration of the order of 2.64 ct / cm 3 in the abrasive portion of the grinding wheel), said diamonds having a size of 220 mesh (ie 76 ⁇
  • this grinding wheel makes it possible to obtain a forming feed speed of at least 30 m / min (the speed of rotation of the grinding wheel being of the order 60 m / s) while maintaining a good quality of the forming joint (especially with a visible number of defects of less than 6 per decimeter) and while offering a service life of at least 50 km at least of shaped joint, with a frequency of brightening every 25 to 30 glasses (ie every 112.5 to 135 m of shaped glass, the perimeter of the glasses shaped in this example being 4.5 m).
  • the glazing obtained by shaping using the grinding wheel according to the invention can be used for example for a motor vehicle or transport, such as windshield, glazing for roof or for side glazing, etc.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Surface Treatment Of Glass (AREA)
  • Laminated Bodies (AREA)

Description

La présente invention concerne une nouvelle meule de façonnage du verre, notamment du verre dit 'plat' (verre en feuille ou vitrage, que la feuille soit plane ou courbée notamment), en particulier du verre dit "mince" (d'épaisseur inférieure ou égale à 2.6 mm, en particulier inférieure ou égale à 2.1 mm), et le cas échéant du verre dit "épais", c'est-à-dire d'épaisseur supérieure à 2.6 mm (en particulier comprise entre 2.6 mm et 4 mm), notamment dans le domaine automobile, ladite meule étant destinée en particulier au façonnage de vitrages de véhicules tels que des pare-brises, des vitrages pour toits ou pour vitrages latéraux feuilletés, ou le cas échéant de type lunettes arrières, etc. L'invention concerne également un procédé de fabrication de la dite meule ainsi que son utilisation pour façonner des vitrages tels que précités, notamment pour véhicules automobiles, ou tout autre verre, en particulier d'épaisseur inférieure ou égale à 4 mm, notamment d'épaisseur inférieure ou égale à 2.6 mm. L'invention concerne en outre un nouveau procédé de façonnage du verre, en particulier de façonnage de vitrages automobiles, utilisant cette meule et permettant notamment d'atteindre des vitesses d'avance de façonnage supérieures ou égales à 30 m/min.The present invention relates to a new glass forming grinding wheel, in particular so-called 'flat' glass (sheet glass or glazing, whether the sheet is flat or curved in particular), in particular so-called "thin" glass (of lower thickness or equal to 2.6 mm, in particular less than or equal to 2.1 mm), and where appropriate of the so-called "thick" glass, that is to say with a thickness greater than 2.6 mm (in particular between 2.6 mm and 4 mm). ), especially in the automotive field, said grinding wheel being intended in particular for shaping vehicle glazing such as windshields, glazing for roofs or laminated side glazing, or where appropriate rear-window type, etc. The invention also relates to a method of manufacturing said grinding wheel and its use for shaping glazing as mentioned above, in particular for motor vehicles, or any other glass, in particular having a thickness of less than or equal to 4 mm, in particular thickness less than or equal to 2.6 mm. The invention furthermore relates to a new process for shaping glass, in particular for shaping automotive glazings, using this wheel and notably making it possible to achieve shaping speeds of greater than or equal to 30 m / min.

L'invention est relative au domaine de la transformation du verre plat. Des meules ont été spécialement développées pour le domaine automobile, mais peuvent être utilisées pour toute application verrière utilisant des verres de même épaisseur. Ces meules de façonnage pour matériaux durs de type verre sont composées de matériaux abrasifs, tels que des diamants synthétiques qui, grâce à leurs propriétés de haute dureté et de résistance thermique, peuvent couper de nombreux matériaux. Ces diamants ou matériaux abrasifs se trouvent généralement dans une matrice ou liant, généralement métallique (notamment à base de cobalt), cet ensemble destiné au façonnage entourant généralement un noyau central, par exemple métallique (notamment en acier inoxydable ou inox), et étant également inséré le cas échéant entre deux parties métalliques pouvant notamment renforcer sa tenue mécanique, faciliter sa fixation, permettre son équilibrage, etc. Une meule pour verre est notamment décrite dans le document US2004/023599 .The invention relates to the field of processing flat glass. Grinding wheels have been specially developed for the automotive field, but can be used for any glass application using glasses of the same thickness. These glass-type hard material forming grinding wheels are made of abrasive materials, such as synthetic diamonds which, due to their high hardness and heat resistance properties, can cut many materials. These diamonds or abrasive materials are generally found in a matrix or binder, generally metallic (especially cobalt base), this assembly for shaping generally surrounding a central core, for example metal (in particular stainless steel or stainless steel), and also being inserted where appropriate between two metal parts may in particular strengthen its mechanical strength, facilitate its fixing, allow balancing, etc. A grinding wheel for glass is described in particular in the document US2004 / 023599 .

Dans le façonnage du verre, on tient généralement compte de quatre paramètres importants : la vitesse d'avance de façonnage (en m/min), la qualité du joint de façonnage (évaluée en observant la concentration et la taille des écailles induites par le façonnage, la qualité du joint demandée dépendant du cahier des charges fixé par le constructeur automobile et étant évaluée dans la présente demande par un appareil de référence GQM commercialisé par la société Bystronic Maschinen AG, cet appareil calculant la taille et la concentration des écailles), la durée de vie de la meule, et la fréquence d'avivage de la meule (l'avivage consistant généralement à nettoyer la meule et à remettre à surface les diamants, cette opération induisant une perte de temps et une usure de la meule par abrasion de son liant métallique). La vitesse d'avance de façonnage est habituellement inférieure ou égale à 20 - 22 m/min en moyenne, et la fréquence d'avivage est généralement de l'ordre d'un avivage tous les 90 à 135 m de verre façonné (soit tous 20 ou 30 verres pour des périmètres de verre de l'ordre de 4.5 m).In the shaping of glass, four important parameters are generally taken into account: the shaping advance speed (in m / min), the quality of the shaping joint (evaluated by observing the concentration and size of the scales induced by shaping , the quality of the seal requested depending on the specifications set by the car manufacturer and being evaluated in the present application by a reference device GQM marketed by the company Bystronic Maschinen AG, this device calculating the size and concentration of the scales), the durability of the grinding wheel, and the frequency of grinding of the grinding wheel (the brightening generally consisting in cleaning the grinding wheel and resurfacing the diamonds, this operation inducing a loss of time and abrasive wear of the grinding wheel. its metallic binder). The shaping advance speed is usually less than or equal to 20 - 22 m / min on average, and the brightening frequency is generally of the order of brightening every 90 to 135 m of shaped glass (ie all 20 or 30 glasses for glass perimeters of the order of 4.5 m).

L'augmentation de la vitesse d'avance de façonnage permettrait de réduire les temps de cycle (et ainsi d'augmenter la productivité) et de réduire les investissements sur les machines de production. Ainsi, on serait capable d'alimenter un four avec, par exemple, une ou deux machines de façonnage au lieu de trois actuellement (pour le verre utilisé dans les feuilletés); cependant une telle vitesse pose le problème de solliciter énormément la meule de façonnage.Increasing the feed rate of forming would reduce cycle times (and thus increase productivity) and reduce investment in production machinery. Thus, one would be able to feed an oven with, for example, one or two shaping machines instead of three currently (for the glass used in the laminates); however, such a speed poses the problem of placing a great deal of stress on the forming wheel.

De ce fait, les meules actuellement disponibles sur le marché ne sont pas adaptées à un façonnage haute vitesse, lequel reste difficilement faisable pour les raisons suivantes notamment :

  • à des vitesses d'avance d'au moins 30m/min, le phénomène de brulage (température trop importante au point de contact verre/meule induisant l'arrachement du verre et non le façonnage, ce phénomène, visible et identifiable, se caractérisant par un trait blanc à la surface du verre, des flammes apparaissant en outre dans le carter d'arrosage lors du façonnage) apparait très rapidement (au bout de quelques vitrages), rendant inacceptable la qualité du joint façonné,
  • à des vitesses d'avance d'au moins 30 m/min, la fréquence d'avivage est bien plus importante (pouvant monter à un avivage tous les 22.5 m à 45 m (ou tous les 5 à 10 verres façonnés pour des périmètres de verre de l'ordre de 4.5 m),
  • la qualité du joint varie en outre au cours du procédé de fabrication (dégradation ponctuelle).
As a result, the grinding wheels currently available on the market are not suitable for high-speed forming, which remains difficult to do for the following reasons, in particular:
  • at speeds of at least 30m / min, the phenomenon of burning (excessive temperature at the point of contact glass / grinding wheel inducing tearing of the glass and not shaping, this phenomenon, visible and identifiable, characterized by a white line on the surface of the glass, flames appearing further in the sump during shaping) appears very quickly (after a few windows), making the quality of the shaped seam unacceptable,
  • at forward speeds of at least 30 m / min, the brightening frequency is much higher (can rise to brightening every 22.5 m to 45 m (or every 5 to 10 glasses shaped for perimeters of glass of the order of 4.5 m),
  • seal quality also varies during the manufacturing process (point degradation).

La présente invention a donc cherché à mettre au point une nouvelle meule de façonnage du verre, en particulier plat, et notamment du verre mince, voire du verre épais, adaptée au domaine de l'automobile notamment, permettant entre autres le façonnage des verres monolithiques utilisés dans les vitrages feuilletés tels que les pare-brises, les vitrages feuilletés pour toits ou les vitrages feuilletés latéraux automobiles, ou le façonnage de tout autre verre (ou matériau verrier) d'épaisseur inférieure ou égale à 4 mm notamment, en particulier d'épaisseur inférieure ou égale à 2.6 mm (verre mince), voire inférieure ou égale à 2.1 mm, ladite meule rendant possible l'augmentation de la vitesse d'avance de façonnage (en particulier permettant d'obtenir une vitesse d'avance de façonnage supérieure ou égale à 30m/min), sans pour autant présenter les inconvénients ou incompatibilités vues précédemment, en particulier permettant de maintenir une bonne qualité du joint de façonnage (notamment un nombre de défauts visibles, c'est-à-dire un nombre de défauts de longueur supérieure à 250 µm en surface du verre, inférieur à 7 par décimètre), tout en offrant une durée de vie égale à au moins 50 km de joint façonné, avec une fréquence d'avivage n'excédant pas 1 avivage tous les 90 m de verre façonné (soit un avivage tous les 20 verres pour des périmètres usuels de verre de l'ordre de 4.5 m).The present invention has therefore sought to develop a new glass forming grinding wheel, particularly flat, including thin glass, or thick glass, adapted to the automotive field in particular, allowing among other things the shaping of monolithic glasses used in laminated glazing such as windshields, laminated glazing for roofs or automotive side laminated glazing, or the shaping of any other glass (or glass material) with a thickness of not more than 4 mm, in particular thickness less than or equal to 2.6 mm (thin glass), or even less than or equal to 2.1 mm, said grinding wheel making it possible to increase the forming feedrate (in particular to obtain a forming feedrate) greater than or equal to 30m / min), without however presenting the disadvantages or incompatibilities seen previously, in particular making it possible to maintain a good quality of the forming joint (in particular a number of visible defects, ie a number of defects greater than 250 μm in length on the surface of the glass, less than 7 per decimeter), while offering a service life equal to at least 50 km of shaped joint, with a brightening frequency not exceeding 1 brightening every 90 m of shaped glass (ie brightening every 20 glasses for usual glass perimeters of the order of 4.5 m).

Ce but est atteint selon l'invention par une meule de façonnage, destinée au façonnage du verre, notamment du verre plat, d'épaisseur inférieure ou égale à 4 mm, en particulier d'épaisseur comprise entre 1.6 et 3.85 m, et notamment du verre mince, d'épaisseur inférieure ou égale à 2.6 mm, en particulier d'épaisseur comprise entre 1.6 et 2.6 mm, mais aussi le cas échéant du verre épais, d'épaisseur comprise en particulier entre 2.6 et 3.85 mm, cette meule étant adaptée et avantageusement destinée au façonnage à haute vitesse, cette meule comprenant au moins une partie abrasive, destinée au façonnage, ladite partie abrasive étant formée d'au moins un liant métallique (au moins un métal, ce liant étant avantageusement un alliage dans la présente invention) et de diamants répartis dans le liant, ledit liant présentant une dureté Rockwell B comprise entre 95 et 105 et étant à base de tungstène, et les diamants présentant une taille comprise entre 75 et 95 µm et une concentration comprise entre 2.2 ct/cm3 et 2.64 ct/cm3 (concentration dans la partie abrasive, formée du liant et des diamants).This object is achieved according to the invention by a shaping wheel, intended for shaping glass, in particular flat glass, with a thickness of less than or equal to 4 mm, in particular with a thickness of between 1.6 and 3.85 m, and particularly of thin glass, with a thickness of less than or equal to 2.6 mm, in particular with a thickness of between 1.6 and 2.6 mm, but also, where appropriate, thick glass, of a thickness in particular of between 2.6 and 3.85 mm, this wheel being suitable and advantageously intended for high speed forming, this grinding wheel comprising at least one abrasive portion for forming, said abrasive portion being formed of at least one metal binder (at least one metal, which binder is advantageously an alloy in the present invention) and diamonds distributed in the binder, said binder having a Rockwell B hardness of between 95 and 105 and being based on tungsten, and diamonds having a size of between 75 and 95 μm and a concentration of between 2.2 ct / cm 3 and 2.64 ct / cm 3 (concentration in the abrasive, formed of binder and diamonds).

La composition du liant est la suivante:

  • tungstène 58-75% en poids
  • bronze 30-37% en poids
  • chrome 0.5-5% en poids
  • nickel 0.5-5% en poids.
The composition of the binder is as follows:
  • tungsten 58-75% by weight
  • bronze 30-37% by weight
  • chrome 0.5-5% by weight
  • nickel 0.5-5% by weight.

Le bronze est formé pour 75 à 85% en poids de cuivre et pour 15 à 25% en poids d'étain.Bronze is formed for 75 to 85% by weight of copper and for 15 to 25% by weight of tin.

La meule selon l'invention est particulièrement adaptée au façonnage du verre plat, comme indiqué précédemment, notamment du verre plat provenant d'un float (ou obtenu par procédé float), en particulier du verre en feuille ou vitrage utilisé dans le domaine automobile, et notamment au façonnage du verre mince, d'épaisseur inférieure ou égale à 2.6 mm, en particulier inférieure ou égale à 2.1 mm (notamment façonnage de vitrages pour feuilletés destinés à former des pare-brises, toits ou latéraux feuilletés, etc.), mais le cas échéant elle convient également avec avantages pour le façonnage du verre (plat) épais, d'épaisseur comprise notamment entre 2.6 et 4 mm, notamment entre 2.6 et 3.85 mm (façonnage de feuilles de verre ou vitrages utilisés comme verres monolithiques dans le domaine automobile pour former par exemple des lunettes arrières, toits, vitrages latéraux automobiles, etc.).The grinding wheel according to the invention is particularly suitable for shaping flat glass, as indicated above, especially flat glass from a float (or obtained by float process), in particular sheet glass or glazing used in the automotive field, and in particular for shaping thin glass, with a thickness of less than or equal to 2.6 mm, in particular less than or equal to 2.1 mm (especially shaping of laminated glazings intended to form windshields, roofs or laminated sides, etc.), but where appropriate it is also suitable with advantages for shaping thick (flat) glass, in particular between 2.6 and 4 mm thick, in particular between 2.6 and 3.85 mm (shaping of glass sheets or glazings used as monolithic glasses in the automotive field to form for example rear glasses, roofs, automotive side windows, etc.).

La meule selon l'invention est particulièrement avantageuse car elle rend possible le façonnage à des vitesses d'avance égales à 30m/min au moins, tout en conservant une bonne qualité de joint, une fréquence d'avivage n'excédant pas un avivage tous les 90 m et une durée de vie égale à au moins 50 km de verre façonné. La combinaison des caractéristiques mentionnées dans la définition de l'invention rend possible l'augmentation de la vitesse de façonnage sans subir les inconvénients précités.The grinding wheel according to the invention is particularly advantageous because it makes it possible to form at speeds of advance equal to at least 30 m / min, while maintaining a good seal quality, a brightening frequency not exceeding brightening all the 90 m and a lifetime equal to at least 50 km of shaped glass. The combination of features mentioned in the definition of the invention makes it possible to increase the forming speed without suffering the aforementioned drawbacks.

La meule selon l'invention se présente généralement sous forme d'un disque de diamètre compris entre 130 et 250 mm, par exemple de l'ordre de 150 mm, formé d'un noyau (annulaire) central métallique (par exemple en acier inoxydable ou inox) et d'une couronne (ou anneau) périphérique (entourant le noyau sur la tranche) présentant une partie (généralement médiane) abrasive, enchâssée entre deux parties métalliques (généralement en inox comme le noyau). La meule est obtenue en assemblant les parties métalliques, se présentant déjà essentiellement en forme (toutes les parties précitées à l'exception de la partie abrasive), et en ajoutant dans l'espace entre les parties métalliques périphériques, le mélange abrasif (le liant, sous forme d'un mélange de poudres métalliques, et les diamants), puis en chauffant l'ensemble sous pression afin d'opérer le frittage du liant et la cohésion des différentes parties entre elles. Un ou des profils (généralement deux profils au plus sont prévus dans l'épaisseur ou sur la tranche de la partie abrasive) appropriés pour le façonnage visé (par exemple au moins un profil requis pour obtenir un chant arrondi sur le bord d'un vitrage) peuvent ensuite être donnés à la partie abrasive sur son bord apparent, par exemple par électroérosion, ces profils étant par la suite ravivés ou entretenus à l'aide de bâtons d'avivage appropriés (ces bâtons étant généralement à base d'alumine). L'épaisseur de la partie abrasive pour les applications automobiles préférées visées est généralement comprise entre 6.4 et 10 mm, la profondeur de la partie abrasive à l'intérieur de la meule (jusqu'au noyau métallique) étant généralement du même ordre (entre 6.4 et 10 mm).The grinding wheel according to the invention is generally in the form of a disc having a diameter of between 130 and 250 mm, for example of the order of 150 mm, formed of a central (annular) central core (for example made of stainless steel or stainless steel) and a peripheral crown (or ring) (surrounding the core on the edge) having a portion (usually median) abrasive, embedded between two metal parts (usually stainless steel as the core). The wheel is obtained by assembling the metal parts, already having essentially shaped (all the aforesaid parts except the abrasive part), and adding in the space between the peripheral metal parts, the abrasive mixture (the binder, in the form of a mixture of metal powders, and diamonds), then heating the assembly under pressure to effect the sintering of the binder and the cohesion of the different parts together. One or more profiles (usually two or more profiles are provided in the thickness or on the edge of the abrasive part) suitable for the intended shaping (for example at least one profile required to obtain a rounded edge on the edge of a glazing unit ) can then be given to the abrasive part on its apparent edge, for example by electroerosion, these profiles being subsequently revived or maintained using appropriate brightening sticks (these sticks are generally based on alumina). The thickness of the abrasive part for the preferred automotive applications referred to is generally between 6.4 and 10 mm, the depth of the abrasive part inside the grinding wheel (up to the metal core) being generally of the same order (between 6.4 and 10 mm).

Comme évoqué précédemment, la combinaison des caractéristiques de liant et de diamants sélectionnés permet d'obtenir les avantages précités. En particulier, le liant de la partie abrasive est choisi de façon à présenter une dureté Rockwell B comprise entre 95 et 105, cette dureté étant mesurée selon la norme EN ISO 6508-1, la dureté étant liée notamment à la composition du liant et influant notamment sur la durée de vie de la meule et la fréquence d'avivage. Comme indiqué dans la définition de l'invention, le liant est à base de tungstène, le tungstène étant son composant majoritaire, le liant en particulier étant formé (à partir) d'au moins 58% (et de préférence d'au moins 59%, notamment d'au moins 60%, en particulier d'au moins 61%) et préférentiellement d'au plus 75% en poids de (poudre de) tungstène la taille des particules de tungstène/de ladite poudre n'excédant pas avantageusement 100 µm.As mentioned above, the combination of the characteristics of the binder and the selected diamonds makes it possible to obtain the abovementioned advantages. In particular, the binder of the abrasive part is chosen so as to have a Rockwell hardness B of between 95 and 105, this hardness being measured according to EN ISO 6508-1, the hardness being linked in particular to the composition of the binder and influencing especially on the life of the grinding wheel and the frequency of brightening. As indicated in the definition of the invention, the binder is based on tungsten, tungsten being its major component, the binder in particular being formed (from) at least 58% (and preferably at least 59%). %, in particular at least 60%, in particular at least 61%) and preferably at most 75% by weight of (tungsten) powder, the size of the tungsten particles / of said powder not exceeding advantageously 100 μm.

Comme évoqué précédemment, outre le tungstène, composant majoritaire du liant, ce dernier est également formé à partir d'autre métaux et constitue un alliage de ces différents métaux. La composition (exprimée en pourcentages pondéraux) du liant est la suivante (c'est-à-dire le liant est obtenu à partir du mélange des composants (métaux) suivants, leur cohésion notamment étant obtenue par frittage comme évoqué précédemment): - (poudre de) tungstène 58-75%, en particulier 59-75%, - (poudre de) bronze 30-37%, en particulier 28-33 % - (poudre de) chrome 0.5- 5%, en particulier environ 1 % - (poudre de) nickel 0.5-5%, en particulier environ 1 %, le bronze étant formé pour 75 à 85% en poids de cuivre et pour 15 à 25% en poids d'étain, en particulier formé d'environ 80% de cuivre et 20% d'étain.As mentioned above, in addition to tungsten, the major component of the binder, the latter is also formed from other metals and is an alloy of these different metals. The composition (expressed in percentages by weight) of the binder is the following (i.e. the binder is obtained from the mixture of the following components (metals), their cohesion in particular being obtained by sintering as mentioned above): - (powder of) tungsten 58-75%, especially 59-75%, - (powder of) bronze 30-37%, especially 28-33% - (powder of) chrome 0.5-5%, especially around 1% - (powder of) nickel 0.5-5%, in particular about 1%, the bronze being formed for 75 to 85% by weight of copper and for 15 to 25% by weight of tin, in particular formed of about 80% of copper and 20% of tin.

La taille des particules de bronze est avantageusement choisie inférieure à 100 µm, celle des particules de chrome est choisie inférieure à 50 µm, et celle des particules de nickel est choisie inférieure à 50 µm. Le taux de tungstène peut être le cas échéant plus élevé pour le façonnage du verre épais que pour le verre mince dans la présente invention, étant par exemple notamment de l'ordre de 61 à 75%, par exemple de l'ordre de 65 à 70%, dans le cas du verre épais notamment, ou alors pouvant être plutôt de l'ordre de 59 à 70%, par exemple de l'ordre de 59 à 65%, dans le cas du verre mince notamment.The size of the bronze particles is advantageously chosen to be less than 100 μm, that of the chromium particles is chosen to be less than 50 μm, and that of the nickel particles is chosen to be less than 50 μm. The tungsten content may be higher if it is used for shaping thick glass than for thin glass in the present invention, for example being of the order of 61 to 75%, for example of the order of 65 to 65%. 70%, in the case of thick glass in particular, or may be rather of the order of 59 to 70%, for example of the order of 59 to 65%, in particular in the case of thin glass.

Le liant ainsi sélectionné contribue notamment à obtenir la fréquence d'avivage et la durée de vie recherchées.The binder thus selected contributes in particular to obtain the brightening frequency and the desired lifetime.

Les diamants présents dans la partie abrasive sont généralement synthétiques. Leur taille (exprimée par la moyenne arithmétique des diamètres des cercles ou sphères dans lesquels les diamants s'inscrivent et généralement évaluée par criblage notamment selon la norme ANSI B74-16 ou FEPA) est choisie dans la présente invention comprise entre 75 et 95 µm (ou encore comprise entre 180 et 240 mesh, la correspondance entre la taille en mesh et la taille en µm étant évaluée selon la norme FEPA (Fédération Européenne des fabricants de produits abrasifs)). La concentration desdits diamants selon l'invention (généralement évaluée par pesée lors de la fabrication de la meule) est également comprise entre 2,2 ct/cm3 (c'est-à-dire carats par cm3) et 2.64 ct/cm3, ce qui correspond également à une concentration comprise entre 0.44 g/cm3 et 0.528 g/cm3 de diamants dans la partie abrasive (correspondant également à un taux entre 10 et 20% en volume de diamants dans la partie abrasive).The diamonds present in the abrasive part are generally synthetic. Their size (expressed as the arithmetic average of the diameters of the circles or spheres in which the diamonds are inscribed and generally evaluated by screening, in particular according to the ANSI B74-16 or FEPA standard) is chosen in the present invention between 75 and 95 μm ( or between 180 and 240 mesh, the correspondence between the mesh size and the size in μm being evaluated according to the FEPA (European Federation of Abrasive Manufacturers) standard). The concentration of said diamonds according to the invention (generally evaluated by weighing during the manufacture of the grinding wheel) is also between 2.2 ct / cm 3 (that is to say, karats per cm 3 ) and 2.64 ct / cm. 3 , which also corresponds to a concentration of between 0.44 g / cm 3 and 0.528 g / cm 3 of diamonds in the abrasive part (also corresponding to a level between 10 and 20% by volume of diamonds in the abrasive part).

Selon un mode de réalisation avantageux, en particulier lorsque les teneurs en tungstène du liant sélectionné sont les plus basses (par exemple sont comprises entre 58 et 70%), les diamants sont choisis pourvus (pour la majorité d'entre eux, en particulier au moins 90% et de préférence 100%) d'au moins un revêtement (en particulier une couche, voire plusieurs) de titane ou le cas échéant à base de titane, le taux de titane étant préférentiellement compris entre 2 et 10% en poids dudit diamant revêtu (par exemple étant de l'ordre de 6% en poids). Ce revêtement ou enrobage se fait en particulier sur les diamants avant fabrication de la meule, par exemple par dépôt physique sous vide de film mince en phase vapeur (dépôt PVD - ou "physical vapor déposition"-, par exemple par pulvérisation cathodique) ou par electrodeposition ou par dépôt chimique en phase vapeur (CVD) sur les diamants avant leur utilisation pour fabriquer la meule selon l'invention. Le fort taux de tungstène et/ou la présence de ce revêtement de titane à la surface des diamants permet notamment la formation de carbure à l'interface liant/diamants lors de la cuisson de la meule pendant sa fabrication, ce qui tend à limiter le phénomène de déchaussement des diamants lors du procédé de façonnage.According to an advantageous embodiment, in particular when the tungsten contents of the selected binder are the lowest (for example are between 58 and 70%), the diamonds are chosen provided (for the majority of them, particularly at less than 90% and preferably 100%) of at least one coating (in particular one or more layers) of titanium or, if appropriate, titanium-based, the titanium content being preferably between 2 and 10% by weight of said titanium; coated diamond (for example being of the order of 6% by weight). This coating or coating is in particular on diamonds before manufacture of the grinding wheel, for example by physical deposition under vacuum of thin film in the vapor phase (PVD deposition - or "physical vapor deposition" -, for example by sputtering) or by electrodeposition or chemical vapor deposition (CVD) on diamonds prior to their use to manufacture the wheel according to the invention. The high rate of tungsten and / or the presence of this titanium coating on the surface of the diamond makes it possible, in particular, to form carbide at the binder / diamond interface during the grinding of the grinding wheel during its manufacture, which tends to limit the phenomenon of loosening of diamonds during the shaping process.

Comme indiqué précédemment, la meule selon l'invention rend possible le façonnage à des vitesses d'avance égales à 30 m/min au moins; on peut la qualifier à ce sujet de meule haute vitesse.As indicated above, the grinding wheel according to the invention makes it possible to form at speeds of advance equal to at least 30 m / min; we can call it high-speed grinding.

L'invention vise également à ce sujet un nouveau procédé (ou une nouvelle opération) de façonnage du verre, en particulier de façonnage de feuilles de verre ou vitrages, en particulier automobiles tels que ceux utilisés pour former des pare-brises, des vitrages pour toits ou pour vitrages latéraux, d'épaisseur inférieure ou égale à 4 mm, en particulier inférieure ou égale à 2.6 mm, notamment inférieure ou égale à 2.1 mm, utilisant la meule précitée et permettant ainsi d'atteindre notamment des vitesses d'avance de façonnage supérieures ou égales à 30 m/min.The subject of the invention is also a new method (or a new operation) for shaping glass, in particular for shaping glass sheets or glazings, in particular for automobiles such as those used to form windshields, glazings for roofs or for side windows, with a thickness of less than or equal to 4 mm, in particular less than or equal to 2.6 mm, in particular less than or equal to 2.1 mm, using the aforementioned grinding wheel and thus making it possible, in particular, to achieve forward speeds of shaping greater than or equal to 30 m / min.

Dans un mode de réalisation avantageux, ce procédé se caractérise également par un rapport de la vitesse de rotation de la meule (en m/min, cette vitesse de rotation variant généralement entre 2400 et 4200 m/min) sur la vitesse d'avance de façonnage (en m/min, c'est-à-dire en mètre de verre façonné par minute, cette vitesse d'avance de façonnage variant généralement entre 20 et 33 m/min, la meule selon l'invention permettant aussi bien de travailler à haute vitesse qu'à basse vitesse, l'avantage dans ce dernier cas étant notamment une durée de vie de la meule significativement améliorée) compris entre 60 et 180, un tel rapport permettant d'obtenir une bonne efficacité de la meule selon l'invention en même temps qu'une vitesse d'avance élevée.In an advantageous embodiment, this method is also characterized by a ratio of the rotational speed of the grinding wheel (in m / min, this rotational speed generally ranging between 2400 and 4200 m / min) on the feed speed of shaping (in m / min, that is to say in meters of glass formed per minute, this shaping advance speed generally ranging between 20 and 33 m / min, the grinding wheel according to the invention making it possible to work both at high speed and at low speed, the advantage in the latter case being in particular a significantly improved grinding wheel life) of between 60 and 180, such ratio to obtain a good efficiency of the grinding wheel according to the invention at the same time as a high speed of advance.

L'invention couvre également un procédé de fabrication de vitrages, notamment pour l'automobile, en particulier de pare-brises, vitrages pour toits ou pour vitrages latéraux, incorporant une opération de façonnage telle que précédemment revendiquée selon l'invention, ainsi qu'un dispositif de fabrication de vitrages, incorporant la meule selon l'invention.The invention also covers a method of manufacturing glazing, in particular for the automobile, in particular windshields, glazing for roofs or for side windows, incorporating a shaping operation as previously claimed according to the invention, as well as a glazing manufacturing device, incorporating the grinding wheel according to the invention.

Les avantages du procédé ou de l'opération de façonnage selon l'invention sont multiples :

  • il est possible de réduire les coûts d'investissements en réduisant le nombre de machines de façonnage requises pour alimenter les fours de formage,
  • il est également possible de réduire les temps de cycle (le gain de temps de façonnage d'un verre au suivant étant de l'ordre de 30% par rapport aux procédés de façonnage habituels) au cours du façonnage, entrainant ainsi des gains de productivité (baisse de plusieurs %, voire dizaines de % sur le temps de cycle notamment),
  • sur une ligne industrielle de fabrication de pare-brises, vitrages automobiles pour toits ou latéraux, il est également possible de limiter les arrêts de ligne, le façonnage à des vitesses élevées permettant d'assurer une continuité dans l'approvisionnement ultérieur de la machine de sérigraphie sans ralentissement lié au façonnage du verre.
The advantages of the process or the shaping operation according to the invention are multiple:
  • it is possible to reduce investment costs by reducing the number of forming machines required to feed the forming furnaces,
  • it is also possible to reduce the cycle times (the time of shaping a glass to the next being of the order of 30% compared to conventional shaping processes) during shaping, thus resulting in productivity gains (fall of several%, even tens of% on the cycle time in particular),
  • in an industrial line for the manufacture of windshields, automotive glazing for roof or side windows, it is also possible to limit the line stops, the shaping at high speeds to ensure a continuity in the subsequent supply of the machine. silkscreen without slowing down due to the shaping of the glass.

La meule selon l'invention est particulièrement adaptée au façonnage du bord des verres, en vue de donner un profil particulier (en formant par exemple un arrondi sur les bords et supprimant ainsi les angles vifs) au chant des verres destinés à former les vitrages désirés. Dans le domaine automobile, ces verres sont issus notamment de procédés float et subissent généralement l'opération de découpe et de façonnage après formation. Généralement, les feuilles de verre issues du procédé float subissent au préalable une étape de découpe à la forme souhaitée, puis sont façonnées, lavées, avant de subir cas échéant une étape de sérigraphie, avant l'étape de formage ou de bombage (par exemple par dépôt sur un cadre de bombage ou armature métallique appropriée puis passage dans un four, par exemple à une température de l'ordre de 650°C), destinée à donner le cas échéant la courbure appropriée au vitrage (en particulier pour les applications automobiles), ce formage ou bombage pouvant s'opérer simultanément sur plusieurs feuilles destinées à être combinées au sein d'un même feuilleté, les feuilles de verre ainsi mises en forme étant ensuite refroidies le cas échéant et associées au besoin à un ou plusieurs intercalaires plastiques de dimensions similaires avant calandrage, chauffage, et pose de joint périphérique le cas échéant.The wheel according to the invention is particularly suitable for shaping the edge of the glasses, in order to give a particular profile (forming for example a rounded edge and thus eliminating sharp angles) to the edge of the glasses intended to form the desired glazing . In the automotive field, these glasses are derived especially from float processes and generally undergo the cutting and shaping operation after formation. Generally, the glass sheets resulting from the float process undergo beforehand a cutting step to the desired shape, then are shaped, washed, before undergoing possibly a screen printing step, before the forming step or bending (for example by deposit on a bending frame or appropriate metal reinforcement and then passage in an oven, for example at a temperature of the order of 650 ° C), intended to give the appropriate curvature if appropriate glazing (especially for automotive applications), this forming or bending which can take place simultaneously on several sheets intended to be combined within the same laminated layer, the glass sheets thus shaped then being cooled if necessary and associated, if necessary, with one or more plastic interleaves of similar dimensions before calendering, heating, and installation of peripheral seal if necessary.

Un liquide de refroidissement (en particulier de l'eau avec le cas échéant un ou des additifs de refroidissement) est généralement utilisé en combinaison avec la meule au point de contact entre la meule et le verre pour évacuer les particules de verre et dissiper l'énergie produite.A coolant (particularly water with optionally one or more cooling additives) is generally used in combination with the grinding wheel at the point of contact between the grinding wheel and the glass to evacuate the glass particles and dissipate the energy produced.

La meule selon l'invention s'est révélée parfaitement apte à remplacer avantageusement les meules habituelles dans des installations existantes de façonnage et de fabrication de vitrages, en particulier automobiles, sachant que les mécanismes régissant l'enlèvement de matière sont généralement complexes, les changements de meule ou de son environnement pouvant influer considérablement.The grinding wheel according to the invention has proved to be perfectly capable of advantageously replacing the usual grinding wheels in existing glass-making and manufacturing facilities, in particular for automobiles, since the mechanisms governing the removal of material are generally complex, the changes millstone or its environment that can significantly affect.

L'invention porte également sur un vitrage, en particulier un pare-brise, vitrage pour toit ou pour vitrage latéral automobile, obtenu par le procédé de façonnage ou de réalisation de vitrages selon l'invention, ainsi que sur un véhicule incorporant ledit vitrage.The invention also relates to a glazing, in particular a windshield, glazing for roof or automotive side glazing, obtained by the method of forming or producing glazing according to the invention, as well as a vehicle incorporating said glazing.

La présente invention concerne également un procédé de réalisation des meules selon l'invention. Ces meules sont réalisées à partir du mélange de poudre(s) métallique(s) (devant former le liant) et de diamants précités dans la définition de la meule selon l'invention, ce mélange étant inséré entre des parties métalliques comme évoqué précédemment, puis l'ensemble formé étant porté à haute température, notamment supérieure à 800°C et généralement inférieure à 980°C, et en particulier comprise entre 900 et 960°C, et mis sous pression, notamment comprise entre 1500 et 2500 psi (pound per square inch correspondant à une pression comprise entre 103.4 et 172.4 bar environ) pendant une durée comprise par exemple entre 45 min et 1h30 (cette opération, correspondant à une étape de frittage, durant en moyenne environ 1 h), l'ensemble formé par le liant métallique incorporant les diamants enserré entre des parties métalliques étant ensuite démoulé sous forme d'une meule puis le profil de coupe de la meule étant effectué sur la partie abrasive par exemple par électro-érosion. Avant son utilisation sur une ligne industrielle, la meule obtenue est également préférentiellement avivée à l'aide d'un ou deux bâtons d'avivage, identiques ou différents, par exemple un bâton dit tendre et un bâton dit dur, et la concentricité de la meule est vérifiée, ces deux opérations se faisant généralement avant le conditionnement de la meule.The present invention also relates to a method of producing grinding wheels according to the invention. These wheels are made from the mixture of powder (s) metal (s) (to form the binder) and diamonds mentioned above in the definition of the grinding wheel according to the invention, this mixture being inserted between metal parts as mentioned above, then the formed assembly being heated to a high temperature, especially greater than 800 ° C. and generally less than 980 ° C., and in particular between 900 and 960 ° C., and pressurized, in particular between 1500 and 2500 psi (pound per square inch corresponding to a pressure between approximately 103.4 and 172.4 bar) for a duration of for example between 45 minutes and 1:30 (this operation, corresponding to a sintering step, lasting on average about 1 h), the assembly formed by the metal binder incorporating the diamonds sandwiched between metal parts then being demolded in the form of a grinding wheel and then the cutting profile of the grinding wheel being made on the abrasive part, for example by electro-erosion. Before its use on an industrial line, the grinding wheel obtained is also preferentially brightened using one or two brightening sticks, identical or different, for example a stick said soft and a stick said hard, and the concentricity of the grinding wheel is checked, these two operations are generally done before the conditioning of the grinding wheel.

La présente invention sera mieux comprise et d'autres détails et caractéristiques avantageuses de l'invention apparaitront à la lecture de l'exemple suivant de meule réalisée selon l'invention.The present invention will be better understood and other advantageous details and characteristics of the invention will become apparent on reading the following example of a wheel made according to the invention.

Exemple:Example:

Une meule selon l'invention a été réalisée en insérant entre des parties métalliques en inox un mélange destiné à former la partie abrasive puis en chauffant l'ensemble sous pression afin d'opérer la cohésion des différentes parties entre elles, puis en générant un profil de façonnage sur la partie abrasive par électroérosion, le mélange destiné à former la partie abrasive étant formé des composants suivants :
- environ 85% en volume de liant de composition suivante (donnée en poids par rapport au liant) : - (poudre de) tungstène: 61 % - (poudre de) bronze : 37 % - (poudre de) chrome: 1 % - (poudre de) nickel 1 %, le bronze étant formé d'environ 80% de cuivre et 20% d'étain, ce liant présentant une dureté Rockwell B d'environ 100,
- environ 15% en volume de diamants (concentration de l'ordre de 2.64 ct/cm3 dans la partie abrasive de la meule), lesdits diamants présentant une taille de 220 mesh (soit 76 µm), étant recouverts de titane (à un taux en poids de 6% du diamant recouvert).A grinding wheel according to the invention was made by inserting between a stainless steel metal part a mixture intended to form the abrasive part and then heating the assembly under pressure so as to effect the cohesion of the different parts between them, then generating a profile. for forming on the electroerosion abrasive portion, the mixture for forming the abrasive portion being formed of the following components:
about 85% by volume of binder of the following composition (given by weight relative to the binder): - (powder of) tungsten: 61% - (powder of) bronze: 37% - (powder of) chrome: 1% - (powder of) nickel 1%, the bronze being formed of about 80% copper and 20% tin, this binder having a Rockwell hardness B of about 100,
approximately 15% by volume of diamonds (concentration of the order of 2.64 ct / cm 3 in the abrasive portion of the grinding wheel), said diamonds having a size of 220 mesh (ie 76 μm), being coated with titanium (at a 6% by weight of the coated diamond).

On a observé que cette meule permettait d'obtenir une vitesse d'avance de façonnage d'au moins 30 m/min (la vitesse de rotation de la meule étant de l'ordre de 60 m/s) tout en maintenant une bonne qualité du joint de façonnage (notamment avec un nombre de défauts visibles inférieur à 6 par décimètre) et tout en offrant une durée de vie d'au moins 50 km au moins de joint façonné, avec une fréquence d'avivage tous les 25 à 30 verres (soit tous les 112.5 à 135 m de verre façonné, le périmètre des verres façonnés dans cet exemple étant de 4.5 m).It has been observed that this grinding wheel makes it possible to obtain a forming feed speed of at least 30 m / min (the speed of rotation of the grinding wheel being of the order 60 m / s) while maintaining a good quality of the forming joint (especially with a visible number of defects of less than 6 per decimeter) and while offering a service life of at least 50 km at least of shaped joint, with a frequency of brightening every 25 to 30 glasses (ie every 112.5 to 135 m of shaped glass, the perimeter of the glasses shaped in this example being 4.5 m).

Le vitrage obtenu par façonnage en utilisant la meule selon l'invention peut être utilisé par exemple pour un véhicule automobile ou de transport, comme pare-brise, vitrage pour toit ou pour vitrage latéral , etc.The glazing obtained by shaping using the grinding wheel according to the invention can be used for example for a motor vehicle or transport, such as windshield, glazing for roof or for side glazing, etc.

Claims (8)

  1. Grinding wheel for shaping glass, notably glass that is less than or equal to 4 mm thick, this grinding wheel comprising at least one abrasive portion formed of at least one metal binder and of diamonds distributed in the binder, characterized in that said binder has a Rockwell B hardness of between 95 and 105 and is tungsten-based, and the diamonds have a size of between 75 and 95 µm and a concentration of between 2.2 ct/cm3 and 2.64 ct/cm3, the composition of the binder expressed in percentages by weight being as follows: - tungsten 58-75% - bronze 30-37% - chrome 0.5-5% - nickel 0.5-5%
    75 to 85% by weight of the bronze being formed of copper and 15 to 25% by weight being formed of tin.
  2. Grinding wheel according to Claim 1, characterized in that it is designed for the shaping of glass that is less than or equal to 2.6 mm thick and/or in that it is designed for high-speed shaping.
  3. Grinding wheel according to either of Claims 1 and 2, characterized in that the diamonds are coated in titanium.
  4. Method for manufacturing a grinding wheel according to one of Claims 1 to 3, according to which a mixture of metal powders and diamonds is produced, this mixture is raised to high temperature, notably higher than 800°C, and pressurized, notably to several bar, the assembly formed by the metal binder incorporating the diamonds then being stripped from a mold in the form of a grinding wheel.
  5. Method or operation for shaping glass, in particular for shaping motor-vehicle glazing units, less than 4 mm thick, wherein at least one grinding wheel according to one of Claims 1 to 3 is used, said method allowing a shaping travel speed greater than or equal to 30 m/min.
  6. Shaping method or operation according to Claim 5, characterized in that the ratio between the rotation speed of the grinding wheel and the shaping travel speed is between 60 and 180.
  7. Method for manufacturing glazing units, in particular for motor vehicles, in particular windshields, roofs or side windows, incorporating a shaping operation according to either of Claims 5 and 6.
  8. Device for manufacturing glazing units, in particular for motor vehicles, in particular windshields, roofs or side windows, incorporating the grinding wheel according to one of Claims 1 to 3.
EP12756776.6A 2011-09-09 2012-08-14 Grinding wheel for shaping flat glass Active EP2753455B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12756776T PL2753455T3 (en) 2011-09-09 2012-08-14 Grinding wheel for shaping flat glass

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1158029A FR2979845B1 (en) 2011-09-09 2011-09-09 FLAT GLASS FILLING WHEEL
PCT/FR2012/051895 WO2013034828A1 (en) 2011-09-09 2012-08-14 Forming mold for flat glass

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EP2753455A1 EP2753455A1 (en) 2014-07-16
EP2753455B1 true EP2753455B1 (en) 2016-10-26

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EP (1) EP2753455B1 (en)
JP (1) JP6046722B2 (en)
KR (1) KR102029507B1 (en)
CN (1) CN103764347B (en)
AR (1) AR087805A1 (en)
BR (1) BR112014003098B1 (en)
CA (1) CA2843849C (en)
EA (1) EA029240B1 (en)
ES (1) ES2611906T3 (en)
FR (1) FR2979845B1 (en)
MX (1) MX351559B (en)
PL (1) PL2753455T3 (en)
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JP7175308B2 (en) * 2017-06-19 2022-11-18 サンーゴバン アブレイシブズ，インコーポレイティド Abrasive article and its formation method
KR102432921B1 (en) * 2020-11-18 2022-08-18 주식회사 세한텍 Wheel for grinding glass sheet and manufacturing method thereof

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US3243922A (en) * 1963-07-09 1966-04-05 Engelhard Hanovia Inc Surfacing of materials
US4457113A (en) * 1982-02-24 1984-07-03 Super-Cut, Inc. Protected super-abrasive grinding tool
TW371637B (en) * 1996-04-10 1999-10-11 Norton Co Vitreous grinding tool containing metal coated abrasive
US6056795A (en) * 1998-10-23 2000-05-02 Norton Company Stiffly bonded thin abrasive wheel
CN1262979A (en) * 1999-02-07 2000-08-16 郑发龙 Artificial diamond saw blade binder
US6416560B1 (en) * 1999-09-24 2002-07-09 3M Innovative Properties Company Fused abrasive bodies comprising an oxygen scavenger metal
US7033408B2 (en) * 2000-08-08 2006-04-25 Robert Fries Method of producing an abrasive product containing diamond
JP2002059367A (en) * 2000-08-23 2002-02-26 Bando Kiko Kk Metal bond diamond grinding wheel and its manufacturing method
US6758733B2 (en) * 2002-03-13 2004-07-06 Ronald C. Wiand Two-part beveling wheel for improved positioning of bevel contours on ophthalmic lenses
US6769964B2 (en) * 2002-08-02 2004-08-03 Saint-Cobain Abrasives Technology Company Abrasive tool having a unitary arbor
FR2892957B1 (en) * 2005-11-09 2009-06-05 Eurotungstene Poudres Soc Par POLYMETALLIC POWDER AND SINTERED PART MANUFACTURED THEREFROM
US20100206941A1 (en) * 2007-05-22 2010-08-19 David Patrick Egan Coated diamond
US20090017736A1 (en) * 2007-07-10 2009-01-15 Saint-Gobain Abrasives, Inc. Single-use edging wheel for finishing glass
KR101269498B1 (en) * 2008-07-02 2013-06-07 생-고벵 아브라시프 Abrasive slicing tool for electronics industry

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KR20140072039A (en) 2014-06-12
WO2013034828A1 (en) 2013-03-14
PT2753455T (en) 2017-01-20
BR112014003098B1 (en) 2020-09-29
US9649747B2 (en) 2017-05-16
KR102029507B1 (en) 2019-10-07
EA201490591A1 (en) 2014-06-30
EA029240B1 (en) 2018-02-28
CA2843849C (en) 2019-08-13
EP2753455A1 (en) 2014-07-16
CA2843849A1 (en) 2013-03-14
MX351559B (en) 2017-10-19
US20150283673A1 (en) 2015-10-08
MX2014002720A (en) 2014-05-01
BR112014003098A2 (en) 2017-02-21
ES2611906T3 (en) 2017-05-11
FR2979845B1 (en) 2015-02-13
AR087805A1 (en) 2014-04-16
JP6046722B2 (en) 2016-12-21
CN103764347B (en) 2017-05-17
FR2979845A1 (en) 2013-03-15
JP2014531329A (en) 2014-11-27
PL2753455T3 (en) 2017-06-30
CN103764347A (en) 2014-04-30

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