WO2015079850A1 - Tempered glass plate manufacturing method - Google Patents

Tempered glass plate manufacturing method Download PDF

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Publication number
WO2015079850A1
WO2015079850A1 PCT/JP2014/078568 JP2014078568W WO2015079850A1 WO 2015079850 A1 WO2015079850 A1 WO 2015079850A1 JP 2014078568 W JP2014078568 W JP 2014078568W WO 2015079850 A1 WO2015079850 A1 WO 2015079850A1
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WIPO (PCT)
Prior art keywords
tempered glass
fusing
laser
product part
plate
Prior art date
Application number
PCT/JP2014/078568
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French (fr)
Japanese (ja)
Inventor
尚利 稲山
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日本電気硝子株式会社
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Publication of WO2015079850A1 publication Critical patent/WO2015079850A1/en

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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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/354—Working by laser beam, e.g. welding, cutting or boring for surface treatment by melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/359—Working by laser beam, e.g. welding, cutting or boring for surface treatment by providing a line or line pattern, e.g. a dotted break initiation line
    • 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
    • B28D1/221—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 by thermic methods
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/08—Severing cooled glass by fusing, i.e. by melting through the glass
    • C03B33/082—Severing cooled glass by fusing, i.e. by melting through the glass using a focussed radiation beam, e.g. laser
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
    • C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
    • C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/50—Inorganic material, e.g. metals, not provided for in B23K2103/02 – B23K2103/26
    • B23K2103/52—Ceramics

Definitions

  • the present invention relates to a method for producing a tempered glass sheet.
  • the tempered glass plate is widely used as a cover glass for displays in mobile devices such as smartphones and tablet PCs that have been rapidly spreading in recent years.
  • a compressive stress layer in which compressive stress is applied to the surface layer portions of the front and back surfaces is formed as a reinforced layer.
  • a tensile stress layer to which a tensile stress is applied is formed between the two compressive stress layers.
  • a typical method is by splitting.
  • a scribe wheel is run along the surface of the tempered glass plate to form a scribe line as a starting point of cutting (see Patent Document 1).
  • the tempered glass plate is cut by applying a bending moment to the periphery of the scribe line.
  • one of the forms for forming the scribe line is a technique called outer cutting.
  • a scribe wheel is mounted on the edge portion of the tempered glass plate that is the starting end of the scribe line. And after running a wheel to the edge part used as the termination
  • This invention made
  • the present invention devised to solve the above problems is a method of manufacturing a tempered glass sheet, comprising a tempering step of using a tempered glass sheet as a tempered glass original sheet by chemical tempering treatment, and a product part and a non-product part. It is characterized by including a fusing step of cutting out the product part by irradiating a fusing laser along a planned cutting line serving as a boundary and fusing the tempered glass original plate.
  • the end part formed by the fusing process (hereinafter referred to as a fusing end part) is formed on the surface layer part of the front and back surfaces.
  • the compressive stress layer that has been formed substantially disappears. That is, at the melted end portion, the strengthening by the chemical strengthening process in the strengthening process is substantially released. Further, accompanying the disappearance of the compressive stress layer, the tensile stress layer formed between the two compressive stress layers substantially disappears.
  • ions having a relatively small diameter contained in the tempered sheet glass by chemical strengthening treatment are replaced with ions having a relatively large diameter
  • the said plate glass turns into a tempered glass original plate.
  • the tempered glass original plate is irradiated with a fusing laser to melt the tempered glass original plate.
  • various ions and atoms that are easily released, including relatively large diameter ions contained in the tempered glass original plate It is thought that it was released from the tempered glass sheet. Thereby, it is assumed that the strengthening by the chemical strengthening process is substantially canceled at the melted end portion of the cut product part.
  • the planned cutting line is preferably a closed loop surrounding the product part.
  • the region ahead of the fusing direction is strengthened by the heat of the defocused laser with reference to the irradiation region of the fusing laser.
  • the glass plate can be preheated.
  • region of the advancing direction of fusing it becomes possible to anneal the tempered glass original plate with the heat
  • a tempered glass plate capable of suitably forming a scribe line including an edge portion without causing breakage.
  • the method for producing a tempered glass sheet according to the present embodiment includes a tempering step (FIG. 1) in which a tempered glass sheet G is tempered glass original sheet GG by a chemical tempering treatment, and a product part GG1. And a cutting process (FIG. 2) for cutting out the product part GG1 by irradiating the cutting laser L along the planned cutting line CL which becomes the boundary between the non-product part GG2 and fusing the tempered glass original sheet GG. Yes.
  • the strengthening process is executed. As shown in FIG. 1, in the strengthening step, the strengthening sheet glass G is immersed in potassium nitrate molten salt (KNO 3 ), and thus the sheet glass G is chemically strengthened.
  • KNO 3 potassium nitrate molten salt
  • the glass composition of the plate glass G is, by mass%, SiO 2 : 50 to 80%, Al 2 O 3 : 5 to 25%, B 2 O 3 : 0 to 15%, Na 2 O: 1 to 20 %, K 2 O: 0 to 10% is preferable.
  • the thickness of the plate glass G is preferably 50 ⁇ m to 500 ⁇ m.
  • the strengthening time for strengthening the plate glass G is preferably within a range of 15 minutes to 16 hours, and more preferably within a range of 30 minutes to 8 hours.
  • the temperature at which the glass sheet G is strengthened is preferably in the range of 350 ° C. to 550 ° C., more preferably in the range of 380 ° C. to 480 ° C.
  • the tempered glass sheet G is reinforced and becomes a tempered glass original sheet GG.
  • a compressive stress layer A to which compressive stress is applied is formed on the surface layer portions of the front and back surfaces GGa and GGb of the tempered glass original plate GG, and a tensile stress is applied between the two compressive stress layers A.
  • a stress layer B is formed.
  • the compressive stress acting on the compressive stress layer A is preferably adjusted so that the value is in the range of 300 MPa to 900 MPa.
  • the fusing process is performed.
  • the irradiation region D of the fusing laser L is moved in the C direction along the planned cutting line CL of the tempered glass original sheet GG.
  • the planned cutting line CL (only part of which is shown in FIG. 2) is a closed loop that draws a rectangle, and surrounds a product portion GG1 that is a part of the tempered glass original sheet GG that is used as a product.
  • the planned cutting line CL is also a boundary between the product part GG1 and the non-product part GG2 which is a discarded part of the tempered glass original sheet GG. That is, in this embodiment, the non-product part GG2 surrounds the rectangular product part GG1.
  • the fusing laser L is focused and irradiated on the tempered glass original plate GG so that the focal point is located in the vicinity of the front surface GGa or the rear surface GGb even if the focal point is within the range of the thickness of the tempered glass original plate GG or outside the range.
  • the oscillation form of the fusing laser L is pulse oscillation.
  • the pulse period of the fusing laser L is preferably in the range of 10 ⁇ s to 10,000 ⁇ s.
  • the pulse width of the fusing laser L is preferably in the range of 1 ⁇ s to 1000 ⁇ s.
  • the irradiation conditions to the tempered glass original board GG of the laser L for fusing including the above-mentioned conditions can be made into the same conditions as the case where an unstrengthened sheet glass is melted.
  • the type, wavelength, output, oscillation form, etc. of the laser L for fusing are the speed (processing speed) for fusing the tempered glass original GG, the thickness of the tempered glass original GG, the diameter in the irradiation region D of the laser L for fusing ( It may be adjusted in accordance with the beam diameter.
  • the output of the fusing laser L when fusing the unstrengthened plate glass is As a reference, the output is preferably 1.5 times or less.
  • the irradiation region E including the irradiation region D of the fusing laser L is irradiated with a laser beam defocused compared to the fusing laser L.
  • the defocused laser is irradiated so that the focal point is located at a predetermined position away from the front surface GGa or the back surface GGb of the tempered glass original plate GG.
  • the optical axis of the defocused laser is inclined with respect to the front and back surfaces GGa and GGb of the tempered glass original plate GG and extends in a direction perpendicular to the planned cutting line CL in plan view. ing.
  • the defocused laser irradiation region E is formed in an elliptical shape having a length in a direction orthogonal to the planned cutting line CL.
  • the irradiation conditions (defocused laser type, wavelength, output, oscillation mode, etc.) of the defocused laser to the tempered glass substrate GG are the same as the laser L for fusing, and the laser defocused on the unstrengthened plate glass. The same conditions as in the case of irradiating can be used.
  • an assist gas AG that sprays the molten glass MG melted by the heating of the fusing laser L is injected toward the irradiation region D of the fusing laser L.
  • This assist gas AG is injected so as to be orthogonal to the planned cutting line CL along the surface of the tempered glass original plate GG and from the product part GG1 side toward the non-product part GG2 side.
  • the molten glass MG is generated by heating the fusing laser L in the irradiation region D by irradiating the tempered glass original sheet GG with the fusing laser L. Then, the generated molten glass MG is removed by scattering from the product part GG1 side to the non-product part GG2 side by the pressure of the assist gas AG. Thereby, the tempered glass original plate GG is fused into the product part GG1 and the non-product part GG2. And if a fusing process is completed, rectangular product part GG1 will be cut out from tempered glass original plate GG. That is, as for this product part GG1, the perimeter of the edge part GG1c used as the outer peripheral end is formed by fusing.
  • the tempered glass original sheet GG is preheated by the heat of the defocused laser. Furthermore, in the region Eb on the rear side in the fusing direction (C direction), the tempered glass original sheet GG is gradually cooled by the heat of the defocused laser.
  • A substantially disappears. That is, in the end portion GG1c, the strengthening by the chemical strengthening process in the strengthening process is substantially released. Further, accompanying the disappearance of the compressive stress layer A, the tensile stress layer B formed between the two compressive stress layers A substantially disappears.
  • the width W of the part where the compressive stress layer A and the tensile stress layer B substantially disappear is , Approximately 200 ⁇ m or more.
  • the fact that the compressive stress layer A substantially disappears is that the value of the compressive stress acting on the surface layer portions of the front and back surfaces GG1a and GG1b is 150 MPa or less at the end portion GG1c. Means that.
  • the tempered glass original sheet GG is irradiated with the fusing laser L to melt the tempered glass original sheet GG.
  • various ions and atoms that are easily released, including potassium ions contained in the tempered glass original sheet GG are strengthened. It is thought that it is emitted from the glass original plate GG. Thereby, it is assumed that the strengthening by the chemical strengthening process is substantially canceled at the end portion GG1c of the cut product portion GG1.
  • the tempered glass original plate GG in the fusing process, out of the irradiation region E irradiated with the defocused laser, the front of the fusing direction (C direction) with reference to the irradiation region D of the fusing laser L
  • the tempered glass original plate GG in the side area Ea, can be preheated by the heat of the defocused laser.
  • the tempered glass original sheet GG in the region Eb on the rear side in the fusing direction (C direction), the tempered glass original sheet GG can be gradually cooled by the heat of the defocused laser. For this reason, it is possible to prevent the occurrence of a situation in which the tempered glass original sheet GG is cracked due to rapid heating or rapid cooling of the tempered glass original sheet GG at the time of fusing.
  • the reinforcing glass sheet G has the above-described preferred glass composition, it is easy to achieve both ion exchange performance and devitrification resistance at a high level.
  • the tempered glass original sheet GG for example, when the value of the tensile stress acting on the tensile stress layer B is 50 MPa or more, cracks are likely to develop due to the tensile stress. Therefore, in such a case, if the manufacturing method of the tempered glass board concerning this embodiment is used, the effect can be enjoyed more suitably.
  • the manufacturing method of the tempered glass board which concerns on this invention is not limited to the aspect demonstrated by said embodiment.
  • the product portion has a rectangular shape, and the entire periphery of the end portion that is the outer peripheral end thereof is formed by fusing, so that the reinforcement is substantially released on the entire periphery of the end portion. It has become.
  • the present invention is not limited to this.
  • the shape of a product part is not limited to a rectangle, It can be set as arbitrary shapes. Even in this case, it is possible to substantially cancel strengthening of only a part of the entire circumference of the end part that is the outer peripheral end of the product part by fusing.
  • the end portion formed by fusing if the edge portion of the end portion is used as the start or end of the scribe line, the product portion is not damaged, and the scribe line is suitably included including the edge portion. Can be formed.
  • the defocused laser irradiation region is formed in an elliptical shape having a length in the direction orthogonal to the planned cutting line. You may form so that it may become. Further, the irradiation region may be formed in a circular shape. Furthermore, in said embodiment, before irradiating the laser for fusing or defocused laser to the tempered glass original plate, you may irradiate the laser for heating which raises the temperature of a tempered glass original plate. If it does in this way, the effect of relieving the tensile stress which acted on the tensile-stress layer can be acquired.
  • a strengthening step and a fusing step were performed in the same manner as the above embodiment, and a product part was cut out. Then, the width of the portion where the compressive stress layer and the tensile stress layer substantially disappeared and the strengthening was substantially released at the end portion serving as the outer peripheral end of the cut product portion was measured.
  • T2X-0 manufactured by Nippon Electric Glass Co., Ltd. was used as the glass plate for strengthening.
  • the thickness is 200 ⁇ m.
  • the reinforcing glass sheet was immersed in 420 ° C. potassium nitrate molten salt for 3 hours.
  • a carbon dioxide gas laser having a wavelength of 10.6 ⁇ m was used as a fusing laser.
  • the oscillation form is pulse oscillation.
  • the output is 12 W
  • the beam diameter is 120 ⁇ m
  • the pulse period is 1000 ⁇ s
  • the pulse width is 160 ⁇ s.
  • Fusing was performed by moving the irradiation region of the laser for fusing at a speed of 10 mm / s with respect to the tempered glass original plate.
  • the width of the part where the strengthening was substantially released was measured for the product part cut out under these conditions, and the width was 348 ⁇ m.

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Abstract

Provided is a tempered glass plate manufacturing method which includes the following: a tempering step in which a tempered glass base plate (GG) is obtained by chemically tempering a glass plate (G) for tempering; and a thermal cutting step in which a thermal cutting laser (L) radiates along a planned cutting line (CL) which is the boundary between a product part (GG1) and a non-product part (GG2),and the product part (GG1) is cut out by thermal cutting the tempered glass base plate (GG).

Description

強化ガラス板の製造方法Method for producing tempered glass sheet
　本発明は、強化ガラス板の製造方法に関する。 The present invention relates to a method for producing a tempered glass sheet.
　強化ガラス板は、近年急速に普及しているスマートフォンや、タブレット型ＰＣ等のモバイル機器において、ディスプレイ用のカバーガラスとして広く採用されている。この強化ガラス板には、強化層として、表裏面の表層部に圧縮応力が作用した圧縮応力層が形成されている。また、これら両圧縮応力層の間には、引張応力が作用した引張応力層が形成される。 The tempered glass plate is widely used as a cover glass for displays in mobile devices such as smartphones and tablet PCs that have been rapidly spreading in recent years. In this tempered glass plate, a compressive stress layer in which compressive stress is applied to the surface layer portions of the front and back surfaces is formed as a reinforced layer. In addition, a tensile stress layer to which a tensile stress is applied is formed between the two compressive stress layers.
　強化ガラス板を切断するための方法としては、種々のものがあるが、代表的なものとして、折割りによる方法がある。この方法では、まず、強化ガラス板の面に沿ってスクライブホイールを走行させ、切断の起点となるスクライブラインを形成する（特許文献１を参照）。その後、スクライブラインの周辺に曲げモーメントを作用させることで、強化ガラス板の切断を実行する。 There are various methods for cutting the tempered glass plate, but a typical method is by splitting. In this method, first, a scribe wheel is run along the surface of the tempered glass plate to form a scribe line as a starting point of cutting (see Patent Document 1). Then, the tempered glass plate is cut by applying a bending moment to the periphery of the scribe line.
　この折割りによる方法において、スクライブラインを形成する態様の一つに、外切りと呼ばれる手法がある。この手法では、まず、スクライブラインの始端となる強化ガラス板のエッジ部にスクライブホイールを乗り上げさせる。そして、強化ガラス板の面に沿ってホイールをスクライブラインの終端となるエッジ部まで走行させた後、当該エッジ部からホイールを落下させる。 In this method of splitting, one of the forms for forming the scribe line is a technique called outer cutting. In this method, first, a scribe wheel is mounted on the edge portion of the tempered glass plate that is the starting end of the scribe line. And after running a wheel to the edge part used as the termination | terminus of a scribe line along the surface of a tempered glass board, a wheel is dropped from the said edge part.
特開２０１３－２２７１９０号公報JP 2013-227190 A
　この外切りによれば、エッジ部に乗り上げさせることで、スクライブホイールの空転が防止されるため、切断に好適な深さのスクライブラインを形成しやすくなる。また、スクライブラインが、強化ガラス板の端から端まで形成されるため、強化ガラス板の切断を確実に実行しやすくなるという利点がある。しかしながら一方で、スクライブラインの形成に外切りを採用した場合には、以下のような解決すべき問題がある。 According to this outer cutting, since the scribe wheel is prevented from slipping by riding on the edge portion, it becomes easy to form a scribe line having a depth suitable for cutting. In addition, since the scribe line is formed from end to end of the tempered glass plate, there is an advantage that the tempered glass plate can be reliably cut easily. However, on the other hand, when an outer cut is adopted for forming the scribe line, there are problems to be solved as follows.
　すなわち、スクライブホイールがエッジ部に乗り上げる際や、エッジ部から落下する際の衝撃等によって、強化ガラス板の外周端となる端部では、引張応力層にまで到達するような深いクラックが発生しやすくなる。そして、このような深いクラックが発生した場合には、引張応力層に作用した引張応力によって当該クラックが進展し、結果として強化ガラス板が破損してしまう事態を招いていた。 In other words, deep cracks that reach the tensile stress layer are likely to occur at the edge that becomes the outer peripheral edge of the tempered glass sheet due to impact when the scribe wheel rides on the edge part or falls from the edge part. Become. And when such a deep crack generate | occur | produced, the said crack progressed by the tensile stress which acted on the tensile-stress layer, and the situation where the tempered glass board was damaged as a result was invited.
　なお、このような問題は、外切りによって強化ガラス板にスクライブラインを形成する場合のみならず、スクライブラインの始端と終端とのいずれかが、エッジ部に位置する場合のように、エッジ部を含めてスクライブラインを形成する場合には、同様に生じ得る問題である。さらには、スクライブホイールのみでなく、他の手段によりエッジ部を含めてスクライブラインを形成する場合も、また同様である。 In addition, such a problem is not only when the scribe line is formed on the tempered glass plate by external cutting, but when the edge portion of the scribe line is located at the edge portion, such as when the start end or the end of the scribe line is located at the edge portion. In the case where the scribe line is formed, it is a problem that can occur similarly. Furthermore, the same applies to the case where the scribe line is formed not only by the scribe wheel but also by other means including the edge portion.
　従って、エッジ部を含めてスクライブラインを形成する場合であっても、破損を生じることのない強化ガラス板の開発が期待されている。このような事情に鑑みなされた本発明は、破損を生じることなく、エッジ部を含めて好適にスクライブラインを形成できる強化ガラス板を提供することを技術的課題とする。 Therefore, even when the scribe line is formed including the edge portion, development of a tempered glass plate that does not cause breakage is expected. This invention made | formed in view of such a situation makes it a technical subject to provide the tempered glass board which can form a scribe line suitably including an edge part, without producing a failure | damage.
　上記課題を解決するために創案された本発明は、強化ガラス板の製造方法であって、強化用の板ガラスを化学強化処理により強化ガラス原板とする強化工程と、製品部と非製品部との境界となる切断予定線に沿って溶断用レーザーを照射し、前記強化ガラス原板を溶断することで、前記製品部を切り出す溶断工程とを含むことに特徴付けられる。 The present invention devised to solve the above problems is a method of manufacturing a tempered glass sheet, comprising a tempering step of using a tempered glass sheet as a tempered glass original sheet by chemical tempering treatment, and a product part and a non-product part. It is characterized by including a fusing step of cutting out the product part by irradiating a fusing laser along a planned cutting line serving as a boundary and fusing the tempered glass original plate.
　このような方法によれば、切り出された製品部の外周端となる端部のうち、溶断工程によって形成された端部（以下、溶断端部と表記する）では、表裏面の表層部に形成されていた圧縮応力層が実質的に消滅する。つまり、溶断端部においては、強化工程での化学強化処理による強化が実質的に解除された状態となる。さらに、圧縮応力層の消滅に付随して、両圧縮応力層の間に形成されていた引張応力層が実質的に消滅する。これにより、この製品部のエッジ部を含めてスクライブラインを形成する場合に、溶断端部におけるエッジ部をスクライブラインの始端や終端とすれば、衝撃等に起因して溶断端部に深いクラックが発生したとしても、このクラックを進展させ得る引張応力が実質的に存在しないことになる。その結果、製品部に破損を生じることなく、エッジ部を含めて好適にスクライブラインを形成することが可能となる。なお、上述のように、溶断端部において、化学強化処理による強化が実質的に解除されるのは、以下のような理由によるものと想定されている。すなわち、この強化ガラス板の製造方法では、強化工程において、化学強化処理によって強化用の板ガラスに含まれた相対的に径の小さいイオンが、相対的に径の大きいイオンと交換されることで、当該板ガラスが強化ガラス原板となる。そして、溶断工程において、強化ガラス原板に溶断用レーザーを照射して、当該強化ガラス原板を溶断する。このとき、溶断用レーザーの熱に起因して、当該レーザーの照射領域の近傍では、強化ガラス原板に含まれた相対的に径の大きいイオンをはじめとして、放出されやすい種々のイオンや原子が当該強化ガラス原板から放出されているものと考えられる。これにより、切り出された製品部の溶断端部において、化学強化処理による強化が実質的に解除されるものと想定される。 According to such a method, in the end part which becomes the outer periphery end of the cut out product part, the end part formed by the fusing process (hereinafter referred to as a fusing end part) is formed on the surface layer part of the front and back surfaces. The compressive stress layer that has been formed substantially disappears. That is, at the melted end portion, the strengthening by the chemical strengthening process in the strengthening process is substantially released. Further, accompanying the disappearance of the compressive stress layer, the tensile stress layer formed between the two compressive stress layers substantially disappears. As a result, when forming the scribe line including the edge portion of the product portion, if the edge portion at the fusing end portion is used as the start or end of the scribe line, a deep crack is caused at the fusing end portion due to impact or the like. Even if it occurs, there is substantially no tensile stress that can cause the crack to develop. As a result, it is possible to suitably form a scribe line including the edge portion without causing damage to the product portion. In addition, as mentioned above, it is assumed that the strengthening by the chemical strengthening process is substantially canceled at the melted end portion for the following reason. That is, in this method for producing a tempered glass sheet, in the tempering step, ions having a relatively small diameter contained in the tempered sheet glass by chemical strengthening treatment are replaced with ions having a relatively large diameter, The said plate glass turns into a tempered glass original plate. Then, in the fusing step, the tempered glass original plate is irradiated with a fusing laser to melt the tempered glass original plate. At this time, due to the heat of the fusing laser, in the vicinity of the laser irradiation region, various ions and atoms that are easily released, including relatively large diameter ions contained in the tempered glass original plate, It is thought that it was released from the tempered glass sheet. Thereby, it is assumed that the strengthening by the chemical strengthening process is substantially canceled at the melted end portion of the cut product part.
　上記の方法において、前記切断予定線が、前記製品部を囲う閉ループとなっていることが好ましい。 In the above method, the planned cutting line is preferably a closed loop surrounding the product part.
　このようにすれば、切り出された製品部の外周端となる端部について、その全周を溶断端部とすることが可能となる。このため、製品部へのスクライブラインの形成に外切りを採用した場合において、スクライブラインをどのように形成したとしても、当該スクライブラインの始端と終端との双方を溶断端部に位置させることができる。その結果、製品部に破損を生じることなく、当該製品部の切断に好適な外切りによるスクライブラインを形成することが可能となる。 If it does in this way, it will become possible to make the whole circumference into a fusing edge part about the edge part used as the outer periphery edge of the cut-out product part. For this reason, in the case of adopting an outer cut for forming the scribe line in the product part, no matter how the scribe line is formed, both the start end and the end of the scribe line can be positioned at the fusing end. it can. As a result, it is possible to form a scribe line by outer cutting suitable for cutting the product part without causing damage to the product part.
　上記の方法において、前記溶断用レーザーの照射領域を含む領域に、該溶断用レーザーと比較してデフォーカスしたレーザーを照射することが好ましい。 In the above method, it is preferable to irradiate a region including the irradiation region of the fusing laser with a defocused laser as compared with the fusing laser.
　このようにすれば、溶断工程において、デフォーカスしたレーザーが照射される領域のうち、溶断用レーザーの照射領域を基準として、溶断の進行方向前方側の領域では、デフォーカスしたレーザーの熱により強化ガラス原板を予熱することができる。また、溶断の進行方向後方側の領域では、デフォーカスしたレーザーの熱により強化ガラス原板を徐冷することが可能となる。このため、溶断時における強化ガラス原板の急加熱や急冷に起因して、当該強化ガラス原板に割れが生じるような事態の発生を防止することができる。 In this way, in the fusing process, out of the region irradiated with the defocused laser, the region ahead of the fusing direction is strengthened by the heat of the defocused laser with reference to the irradiation region of the fusing laser. The glass plate can be preheated. Moreover, in the area | region of the advancing direction of fusing, it becomes possible to anneal the tempered glass original plate with the heat | fever of the defocused laser. For this reason, generation | occurrence | production of the situation which a crack arises in the said tempered glass original plate due to rapid heating and rapid cooling of the tempered glass original plate at the time of fusing can be prevented.
　以上のように、本発明によれば、破損を生じることなく、エッジ部を含めて好適にスクライブラインを形成することが可能な強化ガラス板を得ることができる。 As described above, according to the present invention, it is possible to obtain a tempered glass plate capable of suitably forming a scribe line including an edge portion without causing breakage.
本発明の実施形態に係る強化ガラス板の製造方法を示す断面図である。It is sectional drawing which shows the manufacturing method of the tempered glass board which concerns on embodiment of this invention. 本発明の実施形態に係る強化ガラス板の製造方法を示す平面図である。It is a top view which shows the manufacturing method of the tempered glass board which concerns on embodiment of this invention. 本発明の実施形態に係る強化ガラス板の製造方法の作用・効果を示す断面図である。It is sectional drawing which shows the effect | action and effect of the manufacturing method of the tempered glass board which concerns on embodiment of this invention. 本発明の実施形態に係る強化ガラス板の製造方法の作用・効果を示す断面図である。It is sectional drawing which shows the effect | action and effect of the manufacturing method of the tempered glass board which concerns on embodiment of this invention. 本発明の実施形態に係る強化ガラス板の製造方法の作用・効果を説明するための平面図である。It is a top view for demonstrating the effect | action and effect of the manufacturing method of the tempered glass board which concerns on embodiment of this invention. 本発明の実施形態に係る強化ガラス板の製造方法の作用・効果を説明するための平面図である。It is a top view for demonstrating the effect | action and effect of the manufacturing method of the tempered glass board which concerns on embodiment of this invention. 本発明の実施形態に係る強化ガラス板の製造方法の作用・効果を説明するための平面図である。It is a top view for demonstrating the effect | action and effect of the manufacturing method of the tempered glass board which concerns on embodiment of this invention.
　以下、本発明の実施形態に係る強化ガラス板の製造方法について、添付の図面を参照して説明する。 Hereinafter, the manufacturing method of the tempered glass board concerning the embodiment of the present invention is explained with reference to an accompanying drawing.
　本実施形態に係る強化ガラス板の製造方法は、図１及び図２に示すように、強化用の板ガラスＧを化学強化処理により強化ガラス原板ＧＧとする強化工程（図１）と、製品部ＧＧ１と非製品部ＧＧ２との境界となる切断予定線ＣＬに沿って溶断用レーザーＬを照射し、強化ガラス原板ＧＧを溶断することで、製品部ＧＧ１を切り出す溶断工程（図２）とを含んでいる。 As shown in FIGS. 1 and 2, the method for producing a tempered glass sheet according to the present embodiment includes a tempering step (FIG. 1) in which a tempered glass sheet G is tempered glass original sheet GG by a chemical tempering treatment, and a product part GG1. And a cutting process (FIG. 2) for cutting out the product part GG1 by irradiating the cutting laser L along the planned cutting line CL which becomes the boundary between the non-product part GG2 and fusing the tempered glass original sheet GG. Yes.
　まず、強化工程を実行する。図１に示すように、強化工程においては、強化用の板ガラスＧを硝酸カリウム溶融塩（ＫＮＯ３）に浸漬することで、当該板ガラスＧに対して化学強化処理を施す。 First, the strengthening process is executed. As shown in FIG. 1, in the strengthening step, the strengthening sheet glass G is immersed in potassium nitrate molten salt (KNO 3 ), and thus the sheet glass G is chemically strengthened.
　ここで、板ガラスＧのガラス組成としては、質量％で、ＳｉＯ２：５０～８０％、Ａｌ２Ｏ３：５～２５％、Ｂ２Ｏ３：０～１５％、Ｎａ２Ｏ：１～２０％、Ｋ２Ｏ：０～１０％を含有することが好ましい。また、板ガラスＧの厚みとしては、５０μｍ～５００μｍであることが好ましい。さらに、板ガラスＧを強化する強化時間としては、１５分間～１６時間の範囲内とすることが好ましく、３０分間～８時間の範囲内とすることがより好ましい。加えて、板ガラスＧを強化する際の温度としては、３５０℃～５５０℃の範囲内とすることが好ましく、３８０℃～４８０℃の範囲内とすることがより好ましい。 Here, the glass composition of the plate glass G is, by mass%, SiO 2 : 50 to 80%, Al 2 O 3 : 5 to 25%, B 2 O 3 : 0 to 15%, Na 2 O: 1 to 20 %, K 2 O: 0 to 10% is preferable. The thickness of the plate glass G is preferably 50 μm to 500 μm. Further, the strengthening time for strengthening the plate glass G is preferably within a range of 15 minutes to 16 hours, and more preferably within a range of 30 minutes to 8 hours. In addition, the temperature at which the glass sheet G is strengthened is preferably in the range of 350 ° C. to 550 ° C., more preferably in the range of 380 ° C. to 480 ° C.
　化学強化処理により、板ガラスＧの表裏面Ｇａ，Ｇｂの表層部において、強化用の板ガラスＧに含まれた相対的に径の小さいナトリウムイオン（Ｎａ＋）と、硝酸カリウム溶融塩に含まれた相対的に径の大きいカリウムイオン（Ｋ＋）とが交換される。その結果、強化用の板ガラスＧが強化されて強化ガラス原板ＧＧとなる。これにより、強化ガラス原板ＧＧの表裏面ＧＧａ，ＧＧｂの表層部には、圧縮応力が作用した圧縮応力層Ａが形成されると共に、両圧縮応力層Ａの間には、引張応力が作用した引張応力層Ｂが形成される。なお、圧縮応力層Ａに作用する圧縮応力は、その値が３００ＭＰａ～９００ＭＰａの範囲内となるように調節することが好ましい。 By the chemical strengthening treatment, in the surface layer portions of the front and back surfaces Ga and Gb of the plate glass G, sodium ions (Na + ) having a relatively small diameter contained in the plate glass G for strengthening and relative contained in the molten potassium nitrate salt. Are exchanged for potassium ions (K + ) having a large diameter. As a result, the tempered glass sheet G is reinforced and becomes a tempered glass original sheet GG. As a result, a compressive stress layer A to which compressive stress is applied is formed on the surface layer portions of the front and back surfaces GGa and GGb of the tempered glass original plate GG, and a tensile stress is applied between the two compressive stress layers A. A stress layer B is formed. The compressive stress acting on the compressive stress layer A is preferably adjusted so that the value is in the range of 300 MPa to 900 MPa.
　次に溶断工程を実行する。図２に示すように、溶断工程においては、溶断用レーザーＬの照射領域Ｄを、強化ガラス原板ＧＧの切断予定線ＣＬに沿ってＣ方向に移動させる。切断予定線ＣＬ（図２においては一部のみ図示）は、矩形を描く閉ループとなっており、強化ガラス原板ＧＧのうち、製品として使用される部位となる製品部ＧＧ１を囲っている。また、この切断予定線ＣＬは、製品部ＧＧ１と、強化ガラス原板ＧＧのうち、廃棄される部位となる非製品部ＧＧ２との境界ともなっている。すなわち、本実施形態では、矩形の製品部ＧＧ１を非製品部ＧＧ２が囲っている。 Next, the fusing process is performed. As shown in FIG. 2, in the fusing process, the irradiation region D of the fusing laser L is moved in the C direction along the planned cutting line CL of the tempered glass original sheet GG. The planned cutting line CL (only part of which is shown in FIG. 2) is a closed loop that draws a rectangle, and surrounds a product portion GG1 that is a part of the tempered glass original sheet GG that is used as a product. In addition, the planned cutting line CL is also a boundary between the product part GG1 and the non-product part GG2 which is a discarded part of the tempered glass original sheet GG. That is, in this embodiment, the non-product part GG2 surrounds the rectangular product part GG1.
　溶断用レーザーＬは、その焦点が強化ガラス原板ＧＧの厚みの範囲内か、範囲外であっても表面ＧＧａ又は裏面ＧＧｂの近傍に位置するように、強化ガラス原板ＧＧに集光させて照射される。さらに、本実施形態においては、溶断用レーザーＬの発振形態はパルス発振とされている。ここで、溶断用レーザーＬのパルス周期としては、１０μｓ～１００００μｓの範囲内であることが好ましい。また、溶断用レーザーＬのパルス幅としては、１μｓ～１０００μｓの範囲内であることが好ましい。なお、上述の条件を含め、溶断用レーザーＬの強化ガラス原板ＧＧへの照射条件は、未強化の板ガラスを溶断する場合と同じ条件とすることができる。このため、溶断用レーザーＬの種類、波長、出力、発振形態等は、強化ガラス原板ＧＧを溶断する速度（加工速度）や強化ガラス原板ＧＧの厚み、溶断用レーザーＬの照射領域Ｄにおける径（ビーム径）等に応じて調節すればよい。また、溶断用レーザーＬの強化ガラス原板ＧＧへの照射条件を、未強化の板ガラスを溶断する場合と異なる条件とする場合においては、未強化の板ガラスを溶断する場合における溶断用レーザーＬの出力を基準として、１．５倍以下の出力とすることが好ましい。 The fusing laser L is focused and irradiated on the tempered glass original plate GG so that the focal point is located in the vicinity of the front surface GGa or the rear surface GGb even if the focal point is within the range of the thickness of the tempered glass original plate GG or outside the range. The Furthermore, in the present embodiment, the oscillation form of the fusing laser L is pulse oscillation. Here, the pulse period of the fusing laser L is preferably in the range of 10 μs to 10,000 μs. The pulse width of the fusing laser L is preferably in the range of 1 μs to 1000 μs. In addition, the irradiation conditions to the tempered glass original board GG of the laser L for fusing including the above-mentioned conditions can be made into the same conditions as the case where an unstrengthened sheet glass is melted. For this reason, the type, wavelength, output, oscillation form, etc. of the laser L for fusing are the speed (processing speed) for fusing the tempered glass original GG, the thickness of the tempered glass original GG, the diameter in the irradiation region D of the laser L for fusing ( It may be adjusted in accordance with the beam diameter. In addition, in the case where the irradiation conditions for the tempered glass original sheet GG of the fusing laser L are different from those when fusing the unstrengthened plate glass, the output of the fusing laser L when fusing the unstrengthened plate glass is As a reference, the output is preferably 1.5 times or less.
　また、溶断工程において、溶断用レーザーＬの照射領域Ｄを含む照射領域Ｅには、溶断用レーザーＬと比較してデフォーカスしたレーザーを照射する。このデフォーカスしたレーザーは、その焦点が強化ガラス原板ＧＧの表面ＧＧａ又は裏面ＧＧｂから離れた所定位置に位置するように照射されている。また、本実施形態においては、デフォーカスされたレーザーの光軸は、強化ガラス原板ＧＧの表裏面ＧＧａ，ＧＧｂに対して傾斜していると共に、平面視で切断予定線ＣＬと直交する方向に延びている。これにより、デフォーカスされたレーザーの照射領域Ｅは、切断予定線ＣＬに対して直交する方向に長手となる楕円形に形成される。なお、デフォーカスしたレーザーの強化ガラス原板ＧＧへの照射条件（デフォーカスしたレーザーの種類、波長、出力、発振形態等）は、溶断用レーザーＬと同様に、未強化の板ガラスにデフォーカスしたレーザーを照射する場合と同じ条件とすることができる。 In the fusing process, the irradiation region E including the irradiation region D of the fusing laser L is irradiated with a laser beam defocused compared to the fusing laser L. The defocused laser is irradiated so that the focal point is located at a predetermined position away from the front surface GGa or the back surface GGb of the tempered glass original plate GG. Further, in the present embodiment, the optical axis of the defocused laser is inclined with respect to the front and back surfaces GGa and GGb of the tempered glass original plate GG and extends in a direction perpendicular to the planned cutting line CL in plan view. ing. Thus, the defocused laser irradiation region E is formed in an elliptical shape having a length in a direction orthogonal to the planned cutting line CL. In addition, the irradiation conditions (defocused laser type, wavelength, output, oscillation mode, etc.) of the defocused laser to the tempered glass substrate GG are the same as the laser L for fusing, and the laser defocused on the unstrengthened plate glass. The same conditions as in the case of irradiating can be used.
　さらに、溶断工程においては、溶断用レーザーＬの照射領域Ｄを指向して、溶断用レーザーＬの加熱によって溶融した溶融ガラスＭＧを飛散させるアシストガスＡＧを噴射する。このアシストガスＡＧは、強化ガラス原板ＧＧの面に沿って切断予定線ＣＬと直交し、且つ製品部ＧＧ１側から非製品部ＧＧ２側に向かうように噴射される。 Further, in the fusing process, an assist gas AG that sprays the molten glass MG melted by the heating of the fusing laser L is injected toward the irradiation region D of the fusing laser L. This assist gas AG is injected so as to be orthogonal to the planned cutting line CL along the surface of the tempered glass original plate GG and from the product part GG1 side toward the non-product part GG2 side.
　以上により、溶断工程においては、溶断用レーザーＬを強化ガラス原板ＧＧに照射することで、照射領域Ｄにおいて、溶断用レーザーＬの加熱により溶融ガラスＭＧが生成される。そして、生成された溶融ガラスＭＧを、アシストガスＡＧの圧力によって製品部ＧＧ１側から非製品部ＧＧ２側に飛散させて除去する。これにより、強化ガラス原板ＧＧを製品部ＧＧ１と非製品部ＧＧ２とに溶断する。そして、溶断工程が完了すると、強化ガラス原板ＧＧから矩形の製品部ＧＧ１が切り出される。すなわち、この製品部ＧＧ１は、その外周端となる端部ＧＧ１ｃの全周が溶断によって形成されている。 As described above, in the fusing process, the molten glass MG is generated by heating the fusing laser L in the irradiation region D by irradiating the tempered glass original sheet GG with the fusing laser L. Then, the generated molten glass MG is removed by scattering from the product part GG1 side to the non-product part GG2 side by the pressure of the assist gas AG. Thereby, the tempered glass original plate GG is fused into the product part GG1 and the non-product part GG2. And if a fusing process is completed, rectangular product part GG1 will be cut out from tempered glass original plate GG. That is, as for this product part GG1, the perimeter of the edge part GG1c used as the outer peripheral end is formed by fusing.
　また、溶断が進行する際、デフォーカスしたレーザーにより、当該レーザーの照射領域Ｅのうち、溶断用レーザーＬの照射領域Ｄを基準として、溶断の進行方向（Ｃ方向）前方側の領域Ｅａでは、デフォーカスしたレーザーの熱によって強化ガラス原板ＧＧが予熱される。さらに、溶断の進行方向（Ｃ方向）後方側の領域Ｅｂでは、デフォーカスしたレーザーの熱によって強化ガラス原板ＧＧが徐冷される。 Further, when the fusing progresses, in the region Ea on the front side in the fusing direction (C direction) with reference to the irradiation region D of the fusing laser L in the laser irradiation region E by the defocused laser, The tempered glass original sheet GG is preheated by the heat of the defocused laser. Furthermore, in the region Eb on the rear side in the fusing direction (C direction), the tempered glass original sheet GG is gradually cooled by the heat of the defocused laser.
　以下、本発明の実施形態に係る強化ガラス板の製造方法の作用・効果について、添付の図面を参照して説明する。 Hereinafter, the operation and effect of the method for producing a tempered glass sheet according to the embodiment of the present invention will be described with reference to the accompanying drawings.
　この強化ガラス板の製造方法によれば、図３に示すように、切り出された製品部ＧＧ１の外周端となる端部ＧＧ１ｃでは、表裏面ＧＧ１ａ，ＧＧ１ｂの表層部に形成されていた圧縮応力層Ａが実質的に消滅する。つまり、端部ＧＧ１ｃにおいては、強化工程での化学強化処理による強化が実質的に解除された状態となる。さらに、圧縮応力層Ａの消滅に付随して、両圧縮応力層Ａの間に形成されていた引張応力層Ｂが実質的に消滅する。 According to this method of manufacturing a tempered glass plate, as shown in FIG. 3, the compressive stress layer formed on the surface layer portions of the front and back surfaces GG1a and GG1b at the end portion GG1c serving as the outer peripheral end of the cut product portion GG1. A substantially disappears. That is, in the end portion GG1c, the strengthening by the chemical strengthening process in the strengthening process is substantially released. Further, accompanying the disappearance of the compressive stress layer A, the tensile stress layer B formed between the two compressive stress layers A substantially disappears.
　なお、図３に示すように、この強化ガラス板の製造方法において、圧縮応力層Ａと引張応力層Ｂとが実質的に消滅する部位（強化が実質的に解除される部位）の幅Ｗは、概ね２００μｍ以上となる。また、圧縮応力層Ａが実質的に消滅する（強化が実質的に解除される）とは、端部ＧＧ１ｃにおいて、表裏面ＧＧ１ａ，ＧＧ１ｂの表層部に作用する圧縮応力の値が１５０ＭＰａ以下であることを意味する。 In addition, as shown in FIG. 3, in this manufacturing method of a tempered glass plate, the width W of the part where the compressive stress layer A and the tensile stress layer B substantially disappear (part where the strengthening is substantially released) is , Approximately 200 μm or more. Further, the fact that the compressive stress layer A substantially disappears (strengthening is substantially canceled) is that the value of the compressive stress acting on the surface layer portions of the front and back surfaces GG1a and GG1b is 150 MPa or less at the end portion GG1c. Means that.
　これにより、この製品部ＧＧ１にスクライブラインＳを形成する場合に、端部ＧＧ１ｃにおけるエッジ部をスクライブラインＳの始端Ｓａや終端Ｓｂとすれば、衝撃等に起因して端部ＧＧ１ｃに深いクラックが発生したとしても、このクラックを進展させ得る引張応力が実質的に存在しないことになる。その結果、製品部ＧＧ１に破損を生じることなく、エッジ部を含めて好適にスクライブラインＳを形成することが可能となる。 Thereby, when the scribe line S is formed in the product part GG1, if the edge part in the end part GG1c is the start end Sa or the end Sb of the scribe line S, a deep crack is caused in the end part GG1c due to an impact or the like. Even if it occurs, there is substantially no tensile stress that can cause the crack to develop. As a result, it is possible to suitably form the scribe line S including the edge portion without causing damage to the product portion GG1.
　なお、上述のように、端部ＧＧ１ｃにおいて、化学強化処理による強化が実質的に解除されるのは、以下のような理由によるものと想定されている。すなわち、この強化ガラス板の製造方法では、強化工程において、化学強化処理によって強化用の板ガラスＧに含まれたナトリウムイオンが、カリウムイオンと交換されることで、当該板ガラスＧが強化ガラス原板ＧＧとなる。 As described above, it is assumed that the strengthening by the chemical strengthening process is substantially canceled at the end GG1c for the following reason. That is, in this tempered glass plate manufacturing method, in the tempering step, sodium ions contained in the tempered plate glass G are exchanged with potassium ions by chemical tempering treatment, so that the plate glass G and the tempered glass original plate GG are exchanged. Become.
　そして、図４に示すように、溶断工程において、強化ガラス原板ＧＧに溶断用レーザーＬを照射して、当該強化ガラス原板ＧＧを溶断する。このとき、溶断用レーザーＬの熱に起因して、当該レーザーＬの照射領域Ｄの近傍では、強化ガラス原板ＧＧに含まれたカリウムイオンをはじめとして、放出されやすい種々のイオンや原子が当該強化ガラス原板ＧＧから放出されているものと考えられる。これにより、切り出された製品部ＧＧ１の端部ＧＧ１ｃにおいて、化学強化処理による強化が実質的に解除されるものと想定される。 Then, as shown in FIG. 4, in the fusing process, the tempered glass original sheet GG is irradiated with the fusing laser L to melt the tempered glass original sheet GG. At this time, due to the heat of the laser L for fusing, in the vicinity of the irradiation region D of the laser L, various ions and atoms that are easily released, including potassium ions contained in the tempered glass original sheet GG, are strengthened. It is thought that it is emitted from the glass original plate GG. Thereby, it is assumed that the strengthening by the chemical strengthening process is substantially canceled at the end portion GG1c of the cut product portion GG1.
　また、この強化ガラス板の製造方法では、切り出された製品部ＧＧ１の外周端となる端部ＧＧ１ｃについて、その全周が溶断によって形成されている。このため、図５ａ～図５ｃ（これらの図において、斜線を施した領域は強化されている）に白抜き矢印で示すように、製品部ＧＧ１へのスクライブラインＳの形成に外切りを採用した場合において、スクライブラインＳをどのように形成したとしても、当該スクライブラインＳの始端Ｓａと終端Ｓｂとの双方を、強化が実質的に解除された端部ＧＧ１ｃに位置させることができる。その結果、製品部ＧＧ１に破損を生じることなく、当該製品部ＧＧ１の切断に好適な外切りによるスクライブラインＳを形成することが可能となる。 Further, in this method of manufacturing a tempered glass plate, the entire circumference of the cut end portion GG1c that is the outer peripheral end of the product portion GG1 is formed by fusing. For this reason, as shown by the white arrow in FIGS. 5a to 5c (the hatched area is strengthened in these drawings), an outer cut is adopted for forming the scribe line S in the product part GG1. In some cases, no matter how the scribe line S is formed, both the start end Sa and the end Sb of the scribe line S can be positioned at the end portion GG1c where the reinforcement is substantially released. As a result, it is possible to form a scribe line S by outer cutting suitable for cutting the product part GG1 without causing damage to the product part GG1.
　さらに、この強化ガラス板の製造方法では、溶断工程において、デフォーカスしたレーザーが照射される照射領域Ｅのうち、溶断用レーザーＬの照射領域Ｄを基準として、溶断の進行方向（Ｃ方向）前方側の領域Ｅａでは、デフォーカスしたレーザーの熱により強化ガラス原板ＧＧを予熱することができる。また、溶断の進行方向（Ｃ方向）後方側の領域Ｅｂでは、デフォーカスしたレーザーの熱により強化ガラス原板ＧＧを徐冷することが可能となる。このため、溶断時における強化ガラス原板ＧＧの急加熱や急冷に起因して、当該強化ガラス原板ＧＧに割れが生じるような事態の発生を防止することができる。 Furthermore, in this method of manufacturing a tempered glass sheet, in the fusing process, out of the irradiation region E irradiated with the defocused laser, the front of the fusing direction (C direction) with reference to the irradiation region D of the fusing laser L In the side area Ea, the tempered glass original plate GG can be preheated by the heat of the defocused laser. Further, in the region Eb on the rear side in the fusing direction (C direction), the tempered glass original sheet GG can be gradually cooled by the heat of the defocused laser. For this reason, it is possible to prevent the occurrence of a situation in which the tempered glass original sheet GG is cracked due to rapid heating or rapid cooling of the tempered glass original sheet GG at the time of fusing.
　加えて、強化用の板ガラスＧが、上述した好ましいガラス組成を有する場合には、イオン交換性能と耐失透性を高いレベルで両立し易くなる。 In addition, when the reinforcing glass sheet G has the above-described preferred glass composition, it is easy to achieve both ion exchange performance and devitrification resistance at a high level.
　なお、強化ガラス原板ＧＧにおいて、例えば、引張応力層Ｂに作用する引張応力の値が５０ＭＰａ以上であるような場合には、当該引張応力によってクラックが進展しやすい。そのため、このような場合において、本実施形態に係る強化ガラス板の製造方法を用いれば、その効果をより好適に享受することができる。 In addition, in the tempered glass original sheet GG, for example, when the value of the tensile stress acting on the tensile stress layer B is 50 MPa or more, cracks are likely to develop due to the tensile stress. Therefore, in such a case, if the manufacturing method of the tempered glass board concerning this embodiment is used, the effect can be enjoyed more suitably.
　ここで、本発明に係る強化ガラス板の製造方法は、上記の実施形態で説明した態様に限定されるものではない。 Here, the manufacturing method of the tempered glass board which concerns on this invention is not limited to the aspect demonstrated by said embodiment.
　上記の実施形態においては、製品部が矩形の形状を有し、その外周端となる端部の全周を溶断によって形成することで、端部の全周において強化を実質的に解除する態様となっている。しかしながら、この限りではなく、例えば、矩形を構成する四辺のうち、任意の辺のみを溶断によって形成することで、当該任意の辺に沿ってのみ強化を実質的に解除する態様としてもよい。また、製品部の形状は矩形に限定されるものではなく、任意の形状とすることができる。この場合においても、製品部の外周端となる端部の全周のうち、一部のみを溶断によって形成することで、一部のみについて強化を実質的に解除することが可能である。これらの態様によっても、溶断によって形成された端部において、当該端部のエッジ部をスクライブラインの始端や終端とすれば、製品部に破損を生じることなく、エッジ部を含めて好適にスクライブラインを形成することができる。 In the above embodiment, the product portion has a rectangular shape, and the entire periphery of the end portion that is the outer peripheral end thereof is formed by fusing, so that the reinforcement is substantially released on the entire periphery of the end portion. It has become. However, the present invention is not limited to this. For example, it is possible to form a mode in which strengthening is substantially canceled only along the arbitrary side by forming only an arbitrary side of the four sides constituting the rectangle by fusing. Moreover, the shape of a product part is not limited to a rectangle, It can be set as arbitrary shapes. Even in this case, it is possible to substantially cancel strengthening of only a part of the entire circumference of the end part that is the outer peripheral end of the product part by fusing. Also in these aspects, in the end portion formed by fusing, if the edge portion of the end portion is used as the start or end of the scribe line, the product portion is not damaged, and the scribe line is suitably included including the edge portion. Can be formed.
　また、上記の実施形態においては、デフォーカスしたレーザーの照射領域が、切断予定線に対して直交する方向に長手となる楕円形に形成されているが、この限りではなく、任意の方向に長手となるように形成してよい。また、当該照射領域は円形に形成してもよい。さらに、上記の実施形態において、強化ガラス原板に溶断用レーザーやデフォーカスしたレーザーを照射する前に、強化ガラス原板の温度を上昇させる加熱用レーザーを照射してもよい。このようにすれば、引張応力層に作用した引張応力を緩和させる効果を得ることができる。 Further, in the above embodiment, the defocused laser irradiation region is formed in an elliptical shape having a length in the direction orthogonal to the planned cutting line. You may form so that it may become. Further, the irradiation region may be formed in a circular shape. Furthermore, in said embodiment, before irradiating the laser for fusing or defocused laser to the tempered glass original plate, you may irradiate the laser for heating which raises the temperature of a tempered glass original plate. If it does in this way, the effect of relieving the tensile stress which acted on the tensile-stress layer can be acquired.
　本発明の実施例として、上記の実施形態と同様の態様によって強化工程と溶断工程とを実行し、製品部を切り出した。そして、切り出された製品部の外周端となる端部において、圧縮応力層と引張応力層とが実質的に消滅し、強化が実質的に解除された部位の幅を測定した。 As an example of the present invention, a strengthening step and a fusing step were performed in the same manner as the above embodiment, and a product part was cut out. Then, the width of the portion where the compressive stress layer and the tensile stress layer substantially disappeared and the strengthening was substantially released at the end portion serving as the outer peripheral end of the cut product portion was measured.
　強化用の板ガラスとしては、日本電気硝子社製Ｔ２Ｘ－０を使用した。厚みは２００μｍである。強化工程では、強化用の板ガラスを４２０℃の硝酸カリウム溶融塩に３時間浸漬した。溶断工程では、溶断用レーザーとして、波長が１０．６μｍの炭酸ガスレーザーを使用した。発振形態はパルス発振である。また、出力は１２Ｗ、ビーム径は１２０μｍ、パルス周期は１０００μｓ、パルス幅は１６０μｓである。この溶断用レーザーの照射領域を、強化ガラス原板に対して１０ｍｍ／ｓの速度で移動させることで溶断した。 T2X-0 manufactured by Nippon Electric Glass Co., Ltd. was used as the glass plate for strengthening. The thickness is 200 μm. In the tempering step, the reinforcing glass sheet was immersed in 420 ° C. potassium nitrate molten salt for 3 hours. In the fusing process, a carbon dioxide gas laser having a wavelength of 10.6 μm was used as a fusing laser. The oscillation form is pulse oscillation. The output is 12 W, the beam diameter is 120 μm, the pulse period is 1000 μs, and the pulse width is 160 μs. Fusing was performed by moving the irradiation region of the laser for fusing at a speed of 10 mm / s with respect to the tempered glass original plate.
　この条件の下で切り出された製品部について、強化が実質的に解除された部位の幅を測定したところ、その幅は３４８μｍであった。この結果、本発明に係る強化ガラス板の製造方法によれば、破損を生じることなく、エッジ部を含めて好適にスクライブラインを形成することが可能な強化ガラス板を得られるものと推認される。 The width of the part where the strengthening was substantially released was measured for the product part cut out under these conditions, and the width was 348 μm. As a result, according to the method for producing a tempered glass plate according to the present invention, it is presumed that a tempered glass plate capable of suitably forming a scribe line including an edge portion without causing breakage can be obtained. .
　Ｇ　　　　　強化用の板ガラス
　ＧＧ　　　　強化ガラス原板
　ＧＧ１　　　製品部
　ＧＧ２　　　非製品部
　ＣＬ　　　　切断予定線
　Ｌ　　　　　溶断用レーザー
　Ｄ　　　　　溶断用レーザーの照射領域
　Ｅ　　　　　デフォーカスしたレーザーの照射領域 G Sheet glass for tempering GG Tempered glass original sheet GG1 Product part GG2 Non-product part CL Scheduled cutting line L Laser for fusing D Irradiation area of fusing laser E Irradiation area of defocused laser

Claims (3)

  1. 　強化ガラス板の製造方法であって、
    　強化用の板ガラスを化学強化処理により強化ガラス原板とする強化工程と、
    　製品部と非製品部との境界となる切断予定線に沿って溶断用レーザーを照射し、前記強化ガラス原板を溶断することで、前記製品部を切り出す溶断工程とを含むことを特徴とする強化ガラス板の製造方法。     A method of manufacturing a tempered glass plate,
    A tempering process in which the tempered glass sheet is made into a tempered glass original sheet by chemical strengthening treatment;
    Strengthening characterized by including a fusing step of irradiating a fusing laser along a planned cutting line that becomes a boundary between a product part and a non-product part and fusing the tempered glass original plate to cut out the product part Manufacturing method of glass plate.
  2. 　前記切断予定線が、前記製品部を囲う閉ループとなっていることを特徴とする請求項１に記載の強化ガラス板の製造方法。 The method for producing a tempered glass sheet according to claim 1, wherein the planned cutting line is a closed loop surrounding the product part.
  3. 　前記溶断用レーザーの照射領域を含む領域に、該溶断用レーザーと比較してデフォーカスしたレーザーを照射することを特徴とする請求項１又は２に記載の強化ガラス板の製造方法。 3. The method for producing a tempered glass sheet according to claim 1, wherein a region including the irradiation region of the fusing laser is irradiated with a laser defocused compared to the fusing laser.
PCT/JP2014/078568 2013-11-28 2014-10-28 Tempered glass plate manufacturing method WO2015079850A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09118535A (en) * 1995-10-26 1997-05-06 Nippon Sheet Glass Co Ltd Method for cutting brittle material plate
WO2013039229A1 (en) * 2011-09-15 2013-03-21 日本電気硝子株式会社 Glass plate cutting method and glass plate cutting device
WO2013039230A1 (en) * 2011-09-15 2013-03-21 日本電気硝子株式会社 Method for cutting glass sheet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09118535A (en) * 1995-10-26 1997-05-06 Nippon Sheet Glass Co Ltd Method for cutting brittle material plate
WO2013039229A1 (en) * 2011-09-15 2013-03-21 日本電気硝子株式会社 Glass plate cutting method and glass plate cutting device
WO2013039230A1 (en) * 2011-09-15 2013-03-21 日本電気硝子株式会社 Method for cutting glass sheet

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