JP2007076953A - Method and device for cutting glass plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for cutting a glass plate which can be suitably used for easily cutting the glass plate, while forming the cut face into a mirror-finished surface. <P>SOLUTION: The glass plate cutting device 1 is equipped with a device body 10, a stress applying device 20 disposed in the device body 10 and applying tensile stress on a predetermined position of the glass plate carried into the device body 10, and a preliminary crack-forming device 30 forming preliminary cracks in the glass plate on which the tensile stress is applied. In this case, the stress applying device 20 is equipped with a support roller 11 having a predetermined curvature radius and supporting the bottom face of the long size glass plate carried into the device body 10, a carry-in side roller 12 disposed at the carry-in side of the glass plate with respect to the support roller 11 and at the opposite side of the support roller 11 with respect to the glass plate, and disposed freely movably in a vertical direction and horizontal direction with respect to the device body 10, and a carry-out side roller 13 disposed at the carry-out side of the glass plate with respect to the support roller 11 and at the opposite side of the support roller 11 with respect to the glass plate, and disposed freely movably in a vertical direction and horizontal direction with respect to the device body 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a glass plate cutting method and a glass plate cutting apparatus.

Conventionally, as a method for cutting glass, mechanical processing represented by cleaving to cut the glass by applying stress to the glass surface on which the cut lines are formed and abrasive processing to cut the glass using abrasive grains, and laser, Physical processing for cutting glass by electric discharge is known. Furthermore, in abrasive processing as machining, fixed abrasive processing that cuts glass using a rotating body on which abrasive grains are fixed, free abrasive processing that cuts glass by spraying abrasive grains, and the like are used. Yes.
Edited by Masayuki Yamane, “Glass Engineering Handbook”, first edition, Asakura Shoten, Japan, July 5, 1999, p. 392-394

  However, in the cutting by cleaving, since the chipping occurs on the cut surface, the cut surface cannot be formed into a mirror surface, and there is a problem that a chamfering process in which the chipping is scraped off with a grindstone is required and the work becomes complicated. In physical processing using a laser or the like, a glass plate is cut by rapidly cooling a laser heating portion and generating and growing cracks from the heating portion. However, the glass plate has a small width, for example, 5.0 mm. When it is below, a crack cannot be generated from a heating part and a cut surface cannot be formed in a mirror surface.

  The objective of this invention is providing the cutting method and glass plate cutting device of a glass plate which can cut | disconnect a glass plate easily, forming a cut surface in a mirror surface.

  In order to achieve the above object, the method for cutting a glass sheet according to claim 1 includes a stress applying step for applying a tensile stress to a predetermined position of the glass sheet, and a preliminary crack in the glass sheet to which the tensile stress is applied. And a preliminary crack forming step to form.

  The method for cutting a glass plate according to claim 2 is the method for cutting a glass plate according to claim 1, wherein the stress applying step is performed by placing one main surface of the glass plate on a side surface of a cylindrical member having a predetermined radius of curvature. It has a supporting step to support, and a pressing step for pressing the other main surface of the glass plate in a direction toward the side surface of the cylindrical member.

The glass plate cutting method according to claim 3 is the glass plate cutting method according to claim 1 or 2, wherein the tensile stress is 9.8 MPa (1.0 × 10 ² kg / cm ² ) or more and the glass. It is characterized by being below the average breaking strength of the plate.

  The glass plate cutting device according to claim 4 includes a stress applying device that applies a tensile stress to a predetermined position of the glass plate, and a preliminary crack forming device that forms a preliminary crack in the glass plate to which the tensile stress is applied. It is characterized by that.

  The glass plate cutting device according to claim 5 is the glass plate cutting device according to claim 4, wherein the stress applying device has a predetermined radius of curvature and supports one main surface of the glass plate on a side surface thereof. It is provided with the cylindrical member and the press member which is arrange | positioned by the other main surface side of the said glass plate, and presses the other main surface of the said glass plate in the direction which goes to the side surface of the said cylindrical member.

The glass plate cutting device according to claim 6 is the glass plate cutting device according to claim 4 or 5, wherein the tensile stress is 9.8 MPa (1.0 × 10 ² kg / cm ² ) or more and the glass plate is cut. It is characterized by having an average fracture strength or less.

  The glass plate cutting device according to claim 7 is the glass plate cutting device according to claim 5 or 6, wherein the cylindrical member and the pressing member are each composed of a roller rotatable around an axis. .

  According to the cutting method of the glass plate of Claim 1, and the glass plate cutting device of Claim 4, a tensile stress is provided to the predetermined position of a glass plate, and a preliminary crack is formed in the site | part to which the tensile stress was provided. Therefore, when stress concentration occurs in the vicinity of the preliminary crack, the crack progresses in a direction perpendicular to the direction of the tensile stress, thereby cutting the glass plate. Therefore, a cut surface other than the cut surface formed by the preliminary crack is formed on the mirror surface, and thus the glass plate can be easily cut while forming the cut surface on the mirror surface.

  According to the method for cutting a glass plate according to claim 2 and the glass plate cutting apparatus according to claim 5, one main surface of the glass plate is supported on the side surface of the cylindrical member having a radius of curvature, and the other main surface of the glass plate is supported. Since the surface is pressed in the direction toward the side surface of the cylindrical member, the glass plate is curved along the side surface of the cylindrical member, so that a uniform and uniform tensile stress can be applied to the glass plate.

According to the method for cutting a glass plate according to claim 3 and the glass plate cutting apparatus according to claim 6, the tensile stress is 9.8 MPa (1.0 × 10 ² kg / cm ² ) or more and the average breakage of the glass plate Since it is below the strength, the glass plate can be reliably cut starting from the position where the preliminary crack is formed.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram schematically showing a glass plate cutting apparatus to which a glass plate cutting method according to an embodiment of the present invention is applied.

  In FIG. 1, a glass sheet cutting apparatus 1 is provided in an apparatus main body 10 and an apparatus main body 10, and a stress applying apparatus 20 that applies a tensile stress to a predetermined position of a glass plate conveyed into the apparatus main body 10. And a preliminary crack forming apparatus 30 for forming a preliminary crack in a glass plate to which a tensile stress is applied.

  The stress applying device 20 has a predetermined radius of curvature and a support roller (cylindrical member) 11 that supports the bottom surface of a long glass plate carried into the device main body 10 and a support roller 11 for the glass plate. And on the glass plate carry-in side with respect to the support roller 11, and a carry-in roller (pressing member) 12 movably provided in the vertical and horizontal directions with respect to the apparatus main body 10, and the glass plate On the other hand, an unloading side roller (pressing member) 13 which is disposed on the opposite side of the supporting roller 11 and on the unloading side of the glass plate with respect to the supporting roller 11 and is movably provided in the vertical direction and the horizontal direction with respect to the apparatus main body 10. Is provided.

  The carry-in roller 12 presses the glass plate onto the outer peripheral surface (side surface) of the support roller 11 by moving in the direction toward the axis of the support roller 11. Further, the carry-out side roller 13 carries out the glass plate from the apparatus main body 10 and presses the glass plate on the outer peripheral surface (side surface) of the support roller 11 by moving in the direction toward the axis of the support roller 11.

  FIG. 2 is an enlarged view of the vicinity of the preliminary crack forming apparatus 30 in FIG.

  In FIG. 2, the preliminary crack forming device 30 includes a cutter wheel 31 and a drive device 32 that moves the cutter wheel 31 relative to the support roller 11.

  In this preliminary crack forming apparatus 30, the cutter wheel 31 is held by a driving device 32, and the driving device 32 is moved in the direction toward the glass plate (the arrow direction in the drawing) so that the outer peripheral edge of the cutter wheel 31 is a corner of the glass plate. Touch the corner. Thereby, a preliminary crack having a predetermined depth is formed in the glass plate positioned between the carry-in roller 12 and the carry-out roller 13.

  FIG. 3 is a diagram for explaining a glass plate cutting method executed by the glass plate cutting apparatus 1 in FIG. 1, and FIG. 4 is a diagram for explaining the continuation of the glass plate cutting method in FIG. 3.

  3 and 4, first, a long glass plate is carried into the apparatus main body 10, and the bottom surface of the glass plate is supported by the support roller 11 (FIG. 3A). Next, the carry-in roller 12 and the carry-out roller 13 are moved in the direction toward the axis of the support roller 11, and the glass plate positioned between the carry-in roller 12 and the carry-out roller 13 is moved to the outer peripheral surface of the support roller 11 ( Press along the side surface (FIG. 3B). Thereby, a uniform and uniform tensile stress can be applied to the glass plate located between the carry-in roller 12 and the carry-out roller 13.

Here, the tensile stress applied to the glass plate is 9.8 MPa (1.0 × 10 ² kg / cm ² ) or more. Thereby, a glass plate can be cut | disconnected reliably. Further, it is preferably 19.6 MPa (2.0 × 10 ² kg / cm ² ) or more, and most preferably 29.4 MPa (3.0 × 10 ² kg / cm ² ) or more. This is because when the tensile stress is 9.8 MPa or less, the glass plate cannot be substantially cut.

  Further, the tensile stress is not more than the average breaking strength of the glass plate. Thereby, a glass plate can be reliably cut | disconnected from the position which formed the preliminary crack as a starting point. This is because when the tensile stress is equal to or higher than the average fracture strength of the glass plate, a crack occurs at a position other than the preliminary crack, and the glass plate cannot be cut at a desired position. The tensile stress is preferably 1/2 of the average breaking strength of the glass plate, and more preferably 1/3 of the average breaking strength.

  Next, in a state where a uniform tensile stress is applied to the glass plate, a preliminary crack is generated at the corners of the upper surface of the glass plate by the preliminary crack forming device 30 (FIG. 3C). When stress concentration occurs in the vicinity of the preliminary crack, a crack is generated from the innermost part of the preliminary crack, and this crack advances in the depth direction of the preliminary crack to reach the bottom surface of the glass plate. Disconnected. The cut surface formed by the generation of the crack is formed into a mirror surface.

  Furthermore, the glass plate cut by rotating the carry-out side roller 13 is carried out (FIG. 4A), and the carry-in side roller 12 and the carry-out side roller 13 are moved away from the axis of the support roller 11 (see FIG. 4 (b)), and then the steps described in FIGS. 3A to 4B are repeated.

  According to the present embodiment, a tensile stress is applied to a predetermined position of the glass plate, and a preliminary crack is formed in the glass plate to which the tensile stress is applied. Cracks progress in a direction perpendicular to the stress, that is, in the thickness direction of the glass plate, thereby cutting the glass plate. Therefore, a cut surface other than the cut surface formed by the preliminary crack is formed on the mirror surface, and thus the glass plate can be easily cut while forming the cut surface on the mirror surface. In addition, since a face is not generated at the time of cutting, the glass plate is not damaged by the cullet (cut face), and the product yield of the glass plate can be improved.

  Further, since the crack progresses perpendicularly to the direction of the tensile stress applied to the glass plate, the glass plate is fixed by fixing the glass plate so as to have a predetermined angle with respect to the axis of the support roller 11. It can be cut at a predetermined angle.

  Here, the range of the tensile stress in which the cut surface can be formed as a mirror surface can be estimated as follows. When a preliminary crack is formed with a tensile stress applied, a crack is generated from the innermost part of the preliminary crack, and a mirror surface is formed in the vicinity of the crack. The relationship between the mirror radius R and the tensile stress σ is expressed by the following equation, where R is the radius of the mirror surface formed by the occurrence of a crack and the tensile stress σ. In the following formula (1), a is a constant specific to the composition of the glass plate.

R = a / σ ² (1)
When a predetermined tensile stress is applied to the glass plate on which the preliminary crack has been formed, the maximum length of the preliminary crack when the crack does not progress and the glass plate is not cut is measured, and the crack progresses instantaneously. The minimum length of the preliminary crack when the glass plate was cut was measured. In the above measurement, the tensile stress applied to the glass plate was changed in the range of 0 to 1.1 × 10 ² MPa (1.1 × 10 ³ kg / cm ² ). Moreover, the mirror surface radius of the glass plate cut | disconnected by each tensile stress was computed using said (1) Formula.

  FIG. 5 is a diagram showing the relationship between the tensile stress and the mirror radius and the relationship between the tensile stress and the size of the preliminary crack.

As shown in FIG. 5, when the tensile stress is 9.8 MPa (1.0 × 10 ² kg / cm ² ) or more, the crack progresses by forming a preliminary crack of 0.5 mm or less in the glass plate. Then, the glass plate can be cut. In addition, the range of the tensile stress σ required to form the mirror surface is a value when the mirror surface radius is equal to the maximum diagonal dimension in the cross section of the glass plate because the mirror surface radius is inversely proportional to the square of the tensile stress. It becomes as follows. Thereby, the cut surface of a glass plate can be formed in a mirror surface over the whole.

For example, when a tensile stress of 39.2 MPa (4.0 × 10 ² kg / cm ² ) is applied, the crack progresses due to a preliminary crack of about 0.1 mm, and a glass article having a cross-sectional dimension of up to 3.1 mm is obtained. It can be cut into a mirror surface.

  FIG. 6 is a view showing a modification of the support roller 11 in FIG.

  In FIG. 6, the support roller 60 is movably attached to the apparatus main body 10, and is movably attached to the apparatus main body 10 and a roller 61 that supports the glass plate and cooperates with the roller 12 to sandwich the glass plate. And a roller 62 for supporting the glass plate and sandwiching the glass plate in cooperation with the roller 13.

  In the glass plate cutting device 1 configured as described above, a long glass plate is carried into the device main body 10 while being supported by the rollers 61 and 62, and the carry-in roller 12 and the carry-out roller 13 are respectively set. The glass plate is sandwiched by moving in the direction toward the rollers 61 and 62. Next, the carry-in roller 12 and the roller 61 are moved in the upper direction of the apparatus main body 10, and the carry-out roller 13 and the roller 62 are moved in the upper direction of the apparatus main body 10, so that the carry-in roller 12 and the carry-out roller 13 are predetermined. Fix at the position. As a result, the glass plate is curved upward, and a uniform tensile stress is applied in the longitudinal direction of the glass plate located between the carry-in roller 12 and the carry-out roller 13. As a result, a cut surface other than the cut surface formed by the preliminary crack is formed on the mirror surface, and the glass plate can be easily cut while forming the cut surface on the mirror surface.

  In the present embodiment, the carry-in roller 12 and the roller 61 are moved in the upper direction of the apparatus main body 10 and the carry-out roller 13 and the roller 62 are moved in the upper direction of the apparatus main body 10. However, the present invention is not limited to this. The carry-in roller 12 and the roller 61 are moved in the horizontal direction with respect to the apparatus main body 10, and the carry-out roller 13 and the roller 62 are moved in the horizontal direction with respect to the apparatus main body 10 and in a direction opposite to the carry-in roller 12 and the roller 61. Good. Thereby, a tensile stress can be reliably given to a glass plate.

  Further, the preliminary crack forming apparatus 30 forms a preliminary crack in the glass plate using a cutter wheel, but is not limited to this, and the preliminary crack is formed in the glass plate using a diamond bit, laser, sandblast, or water jet. It may be generated.

  In the present embodiment, the support roller 11 may be provided so as to be movable in the vertical direction with respect to the apparatus main body 10. Thereby, a tensile stress can be reliably given to a glass plate.

  Further, the preliminary crack forming device 30 may have a heating device such as a heater and locally heat the surface of the glass plate positioned between the carry-in roller 12 and the carry-out roller 13. Thereby, a preliminary | backup crack can be formed, without generating a chipping in a glass plate.

It is a figure which shows roughly the glass plate cutting device with which the cutting method of the glass plate which concerns on embodiment of this invention is applied. It is an enlarged view of the vicinity of the preliminary crack formation apparatus in FIG. It is a figure explaining the cutting method of the glass plate performed by the glass plate cutting device of FIG. It is a figure which shows the continuation of the cutting method of the glass of FIG. It is a figure which shows the relationship between a tensile stress and a mirror surface radius, and the relationship between a tensile stress and the dimension of a preliminary crack, respectively. It is a figure which shows the modification of the support roller in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass plate cutting device 10 Apparatus main body 11 Support roller 12 Carry-in side roller 13 Carry-out side roller 20 Stress applying apparatus 30 Preliminary crack forming apparatus 31 Cutter wheel 32 Drive apparatus

Claims (7)

  A method for cutting a glass plate, comprising: a stress applying step for applying a tensile stress to a predetermined position of the glass plate; and a preliminary crack forming step for forming a preliminary crack in the glass plate to which the tensile stress is applied.   The stress applying step includes: a supporting step for supporting one main surface of the glass plate on a side surface of the cylindrical member having a predetermined radius of curvature; and the other main surface of the glass plate in a direction toward the side surface of the cylindrical member. The glass plate cutting method according to claim 1, further comprising a pressing step of pressing. 3. The method for cutting a glass plate according to claim 1, wherein the tensile stress is 9.8 MPa (1.0 × 10 ² kg / cm ² ) or more and not more than an average breaking strength of the glass plate.   A glass plate cutting device comprising: a stress applying device that applies a tensile stress to a predetermined position of a glass plate; and a preliminary crack forming device that forms a preliminary crack in the glass plate to which the tensile stress is applied.   The stress applying device is disposed on the side of the other main surface of the glass plate, a cylindrical member having a predetermined radius of curvature and supporting one main surface of the glass plate on its side surface, The glass plate cutting device according to claim 4, further comprising a pressing member that presses the other main surface in a direction toward the side surface of the cylindrical member. 6. The glass plate cutting apparatus according to claim 4, wherein the tensile stress is not less than 9.8 MPa (1.0 × 10 ² kg / cm ² ) and not more than an average breaking strength of the glass plate.   The glass plate cutting device according to claim 5 or 6, wherein each of the cylindrical member and the pressing member includes a roller that can rotate around an axis.

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