JP2006273614A - Method of cutting glass plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of cutting a glass plate by which production efficiency is high, cutting precision is high without requiring labor, cutting of a curved shape of a small radius of curvature is possible, a cut surface is smooth and does not require rough grinding. <P>SOLUTION: The method of cutting the glass plate 1 which cuts the glass plate 1 by putting a cutting line to a surface 2 of the glass plate 1 and generating stresses in the cutting lines includes a process of putting major cutting lines 10, 10, etc., having curved sections on the surface 2 of the glass plate 1, a process of putting linear auxiliary cutting lines 20, 20 etc., thereto, an auxiliary cutting process of cutting the glass plate at the portions of the auxiliary cutting lines 20, 20 etc., and a major cutting process of cutting the glass plate at the portions of the major cutting lines 10, 10, etc. At least in the major cutting process, the glass plate 1 is supported by supports 5, 5, etc., and the stress is generated in the major cutting lines 10, 10, etc., by the weight of the glass plate 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of cutting a glass plate, and in particular, has high production efficiency, high labor-saving accuracy, high cutting accuracy, can cut a curved shape with a small curvature radius, and has a smooth cut surface. The method relates to a method for cutting a glass plate that does not require rough polishing.

  Conventionally, in order to cut a glass plate such as a glass substrate, first, a cutting line (scratch) is made on the surface of the glass plate with a glass cutter or a super steel wheel cutter, and then the opposite side to which the cutting line is attached. A method of pressing a glass plate with a pressing member along the cutting line from the back surface is known. This method is specifically shown in FIG.

  In the conventional method for cutting a glass plate shown in FIG. 3, first, a cutting line 10 is attached to the surface 2 of the glass plate 1 with a wheel cutter or the like in (a). Then, as shown in (b), the glass plate 1 is turned over and placed on a rubber plate or the like, and pressed by the pressing member 4 from the back surface 3 along the cutting line 10 of the glass plate. At this time, the glass plate 1 is pressed while being bent by about 0.2 to 0.4 mm. And as shown to (c), the glass plate 1 is parted along the cutting line 10. FIG.

  When a curved cutting line is attached to the surface of the glass plate, a general wheel cutter slides on the surface of the glass plate, and the curved cutting line cannot be applied well. A special wheel cutter having irregularities on the cutting edge is often used.

When a linear cutting line is attached with the wheel cutter shown in Patent Document 1, the glass plate is left to stand for about 10 minutes before pressing the cutting line with a pressing tool from the back surface of the glass plate. It is known that the vertical crack 30 progresses about 80% from the cutting line on the surface in the vertical direction, and the cutting is easier than when a general wheel cutter is used.
JP-A-9-188534

  However, in the case of a small curve such as the curvature radius of the cutting line is 20 mm or less, even if the glass plate is left for 10 minutes or longer, the degree of progress of the vertical cracks is small, and cutting into a smooth cut surface It was difficult and the cut surface was jagged, and sufficient cutting accuracy could not be obtained. For this reason, there is a problem that rough polishing is required before final polishing, which is troublesome.

  For this reason, when pressing the cutting line from the back side of the glass plate with a pressing tool, the glass plate is pulled in the horizontal direction, causing a tensile stress on the cutting line, and dividing while advancing vertical cracks. However, there is a problem that the production efficiency is remarkably lowered. Moreover, since it cut | disconnects while moving a press part tool along a cutting line, there also existed a problem that it took an effort.

  In view of the above-mentioned problems of the prior art, the present invention has high production efficiency, low labor, high cutting accuracy, can be cut in a curved shape with a small radius of curvature, and has a smooth cut surface and rough polishing. An object of the present invention is to provide a method for cutting a glass plate that does not require the use of a glass plate.

To solve this problem,
The invention according to claim 1 is a method of cutting a glass plate in which a cutting line is attached to the surface of the glass plate and stress is generated in the cutting line to cut the glass plate, and the curved surface is provided on the surface of the glass plate. Including a main cutting line, a step of attaching a linear auxiliary cutting line, an auxiliary cutting step of cutting at a portion of the auxiliary cutting line, a main cutting step of cutting at a portion of the main cutting line, at least in the main cutting step, The glass plate is supported by a support, and the stress is generated in the main cutting line by the weight of the glass plate.

  According to a second aspect of the present invention, in the main cutting step, the stress is generated in the main cutting line by the weight of the glass plate, and the main cutting line is cut at a portion of the main cutting line by pressurization. This is a method of cutting a glass plate.

  The invention according to claim 3 is the glass plate cutting method according to claim 1 or 2, wherein the support is placed on the back surface of the glass plate.

  The invention according to claim 4 is the glass plate cutting method according to claim 1 or 2, wherein the support is placed on the surface of the glass plate.

  According to a fifth aspect of the present invention, in the auxiliary cutting step, the glass plate is supported by the support, and the stress is generated in the auxiliary cutting line by the weight of the glass plate. It is the cutting method of the glass plate as described in an item.

  The invention concerning Claim 6 is the cutting method of the glass plate of any one of Claims 1-5 which cut | disconnects in the part of the said auxiliary cutting line by pressurization in the said auxiliary cutting process.

  According to the method for cutting a glass plate of the present invention, due to the weight of the glass plate, stress is generated in the main cutting line having a curved portion, and the vertical crack of the main cutting line is advanced to divide the glass plate. Can be cut with high cutting accuracy without cutting, and even if the main cutting line has a curved shape with a small radius of curvature, the glass plate can be divided with a smooth cutting surface so that rough polishing is unnecessary. .

  Further, the glass plate can be cut more easily and effortlessly by generating stress on the auxiliary cutting line by the self-weight of the glass plate and causing the vertical crack of the auxiliary cutting line to advance and divide.

  Hereinafter, the example of the cutting method of the glass plate which concerns on embodiment of this invention is shown in drawing, and is demonstrated in detail.

[First Embodiment]
FIG. 1 is a schematic diagram showing a method of cutting a glass plate according to the first embodiment, and (a) shows a main cutting line 10, 10... And an auxiliary cutting line 20, 20,. It is a schematic perspective view of the glass plate 1 which attached | subjected, (b) is a schematic sectional drawing in the AA 'cut surface of the glass plate 1 of (a).

  The glass plate cutting method according to the present embodiment includes the main cutting lines 10, 10... And the auxiliary cutting lines 20, 20. ... Dividing only the glass part with the mark, and then placing supports 5, 5... On the back surface 3 of the glass plate 1, and stressing the main cutting lines 10, 10. It will cause.

  The glass plate 1 to be cut is a flat plate having a thickness of 0.2 to 1.1 mm, and examples thereof include a glass substrate used for a liquid crystal display panel and the like. In the present embodiment, a single glass plate is illustrated, but a liquid crystal display panel or an organic electroluminescence (EL) display panel in which two glass substrates are bonded together may be used.

  The glass plate 1 has a size of 300 to 350 mm × 400 to 480 mm. The target objects 15, 15... To be cut are, for example, a liquid crystal display panel, an organic EL display panel, etc. If the display panel has a size of 60 mm × 60 mm, about 12 to 15 pieces can be cut out. The glass plate 1 is used.

  As the wheel cutter for attaching the main cutting lines 10, 10,... And the auxiliary cutting lines 20, 20,. Among these, it is preferable to use a wheel cutter provided with irregularities on the blade edge as shown in Patent Document 1.

  First, the glass plate 1 is placed on a cutting table and fixed. This cutting table is for placing the glass plate 1 when the main cutting lines 10, 10,... And the auxiliary cutting lines 20, 20,.

  The cutting table has a size equal to or larger than the area of the glass plate 1 on which the glass plate 1 can be placed. For example, the cutting table is a plate made of a material such as metal or ceramics. Among them, while the main cutting lines 10, 10... And the auxiliary cutting lines 20, 20. The thing which can cancel | release fixation after finishing attachment is preferable. As such a fixing method, for example, a plurality of small holes are opened in the table, and the glass plate 1 can be sucked and fixed by sucking air from under the cutting table. For example, those that can release the adsorption. Moreover, the thing etc. which can adsorb | suck and fix a glass plate electrostatically are mentioned.

  In the present embodiment, after the glass plate 1 is placed on the cutting table, air is sucked from under the cutting table to adsorb and fix the glass plate 1.

  Next, on the surface 2 of the glass plate 1, the main cutting lines 10, 10... And the auxiliary cutting lines 20, 20.・ ・The main cutting lines 10, 10... May have a curved portion, and the curved portion may have a small curved shape with a radius of curvature of 20 mm or less. Further, the auxiliary cutting lines 20, 20... Are linear. By attaching the auxiliary cutting lines 20, 20... In a straight line with a wheel cutter provided with irregularities on the cutting edge as shown in Patent Document 1, it becomes easy for the vertical crack to proceed, and the auxiliary cutting lines 20, 20,. .. The vertical crack can be advanced to about 80% of the plate thickness.

  In order to prevent the main cutting lines 10, 10 ... and the auxiliary cutting lines 20, 20 ... from continuing, as shown in FIG. Is preferred. Even if the main cutting lines 10, 10... And the auxiliary cutting lines 20, 20... Are scratched with an interval of about 0.5 mm, auxiliary cutting lines 20, 20. When the glass part is divided, the vertical cracks and the auxiliary cutting lines 20, 20... Progress, and the main cutting lines 10, 10. The glass portion with the auxiliary cutting lines 20, 20. Therefore, the auxiliary cutting lines 20, 20... Are damaged by providing an interval of about 0.5 mm between the main cutting lines 10, 10... And the auxiliary cutting lines 20, 20. It is possible to prevent the end surfaces of the target objects 15, 15.

  Further, the main cutting lines 10, 10... And the auxiliary cutting lines 20, 20... May be attached simultaneously with a wheel cutter or may be attached separately.

  Next, the suction of the cutting table is released. When the fixing of the glass plate 1 is released, the glass plate 1 can be bent or vibrated, so that the vertical cracks of the auxiliary cutting lines 20, 20. Goes further.

  The glass plate 1 is pressed from the back surface 3 at the portion of the auxiliary cutting lines 20, 20... With the pressing part, and the glass portion with the auxiliary cutting lines 20, 20. At this time, since the vertical cracks of the auxiliary cutting lines 20, 20... Have already progressed to about 80% of the plate thickness, when pressing the portions of the auxiliary cutting lines 20, 20. In response to the bending or vibration of the glass plate 1, only the glass portion with the auxiliary cutting lines 20, 20.

  In this embodiment, the pressing member causes stress to the auxiliary cutting lines 20, 20... To advance the vertical cracks. However, the back surface 3 of the glass plate is simply placed on the support and left to stand. The vertical cracks of the auxiliary cutting lines 20, 20... Can be advanced by the weight of the glass plate to divide the glass portion with the auxiliary cutting lines 20, 20.

  Next, in the present embodiment, on the back surface 3 side of the glass plate 1, preferably under the objects 15, 15... Of the shape to be cut, the supports 5, 5. The glass plate 1 is supported by

  The supports 5, 5... Are preferably those in which the surface of a metal such as stainless steel is covered with rubber or the like. By covering with rubber, it is possible to prevent the glass plate 1 from sliding from the supports 5, 5... And to prevent the glass plate 1 from being damaged.

  Further, the size of the supports 5, 5... Is preferably slightly smaller than the size of the target objects 15, 15. By making the size of the supports 5, 5... Smaller than the size of the target objects 15, 15... To be cut, the glass plate 1 is placed on the supports 5, 5. , And the vertical cracks 30, 30... Of the main cutting lines 10, 10.

  Moreover, it is preferable that the thickness of support body 5,5 ... is 2.0-5.0 mm. By setting the thickness of the supports 5, 5... To 2.0 to 5.0 mm, the glass plate 1 does not contact the table below the supports 5, 5. 5, 5... Can be bent on the table, and when the cut-off portions 16, 16. Breaking and scattering can be prevented.

  Next, the glass plate 1 is placed on the supports 5, 5... And left for 5 to 30 minutes, and the glass portion with the main cutting lines 10, 10. The objects 15, 15... To be cut are supported by the supports 5, 5..., And are connected at the glass portion with the main cutting lines 10, 10. Since the glass plate 1 is divided at the glass portions with the lines 20, 20..., The glass plate 1 is arranged along the longitudinal direction of the auxiliary cutting lines 20, 20. The glass plate 1 can be bent by its own weight so that 16. When the glass plate 1 is bent by its own weight, stress is generated in the main cutting lines 10, 10..., And the vertical cracks 30, 30. The glass portion with the main cutting lines 10, 10... Can be cut simply by leaving it alone.

  At this time, the cut-off portions 16, 16... Fall, and only the target objects 15, 15.

  In this embodiment, the glass portion with the main cutting lines 10, 10... Is cut only by leaving it alone, but the vertical cracks 30, 30. If the glass plate 1 has progressed to about 80% of the plate thickness, turn the glass plate 1 upside down on the table and press the main cutting lines 10, 10... Or may be cut in a short time.

  According to this embodiment, stress is generated in the main cutting lines 10, 10... By the dead weight of the glass plate 1, and the vertical cracks 30, 30. Therefore, since the glass plate 1 is cut, it can be cut with high cutting accuracy without taking time and effort. In particular, in a curved shape having a small radius of curvature, the glass plate 1 can be cut with a smooth cut surface such that rough polishing is unnecessary.

[Second Embodiment]
FIG. 2 is a schematic view showing a method of cutting a glass plate according to the second embodiment, and (a) shows a main cutting line 10, 10... And an auxiliary cutting line 20, 20,. It is a schematic perspective view of the glass plate 1 which attached | subjected, (b) is a schematic sectional drawing in the BB 'cut surface of the glass plate 1 of (a).

  This embodiment is the same as the first embodiment except that the supports 5, 5... Are placed on the main cutting line side (surface 2) of the cut-off portions 16, 16. Is omitted.

  The size of the supports 5, 5... Is preferably smaller than the size of the cut-off portions 16, 16. By making the size of the supports 5, 5... Smaller than the size of the cut-off portions 16, 16..., The glass plate 1 is flexed well by its own weight on the supports 5, 5. The vertical cracks 30, 30... Of the main cutting lines 10, 10,.

  Moreover, in this embodiment, since the cut-off parts 16, 16 ... are supported by the support bodies 5, 5, ..., the object 15 having a shape to be cut is bent so as to hang down. As a result, the vertical cracks 30, 30... Of the main cutting lines 10, 10. Is left with the cut-off portions 16, 16,.

  The first embodiment is preferable when the size of the target object to be cut is small and the number is large, whereas the second embodiment is large when the size of the target object to be cut is large. It is preferable when there is little.

It is the schematic diagram which showed the cutting method of the glass plate which concerns on 1st Embodiment, (a) is a schematic perspective view of the glass plate which attached the main cutting line and the auxiliary cutting line to the surface, (b) is It is a schematic sectional drawing in the AA 'cut surface of the glass plate of (a). It is the schematic diagram which showed the cutting method of the glass plate which concerns on 2nd Embodiment, (a) is a schematic perspective view of the glass plate which attached the main cutting line and the auxiliary cutting line to the surface, (b) is It is a schematic sectional drawing in the BB 'cut surface of the glass plate of (a). It is the schematic diagram which showed the cutting method of the conventional glass plate, (a) is a schematic diagram which attaches a cutting line to the surface of a glass plate with a wheel cutter etc., (b) flips the glass plate, glass It is a schematic diagram which presses with a press part tool from the back along the cutting line of a board, (c) is a schematic diagram which a glass plate cut | disconnects.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass plate 2 Front surface 3 Back surface 5,5 ... Support body 10,10 ... Main cutting line 15,15 ... Target object 16,16 ... Cut-off part 20,20 ... Auxiliary cutting line

Claims (6)

In the method for cutting a glass plate, a cutting line is attached to the surface of the glass plate, and stress is generated in the cutting line to cut the glass plate.
A step of providing a main cutting line having a curved portion on the surface of the glass plate and a linear auxiliary cutting line;
An auxiliary cutting step of cutting at the portion of the auxiliary cutting line;
Including a main cutting step of cutting at a portion of the main cutting line,
At least in the main cutting step, the glass plate is supported by a support, and the stress is generated in the main cutting line by the weight of the glass plate.   The method of cutting a glass plate according to claim 1, wherein, in the main cutting step, the stress is generated in the main cutting line by the weight of the glass plate, and the main cutting line is cut by pressurization.   The method for cutting a glass plate according to claim 1, wherein the support is placed on the back surface of the glass plate.   The method for cutting a glass plate according to claim 1 or 2, wherein the support is placed on a surface of the glass plate.   The said auxiliary | assistant cutting process WHEREIN: The said glass plate is supported by the said support body, The said stress is produced in the said auxiliary | assistant cutting line by the dead weight of the said glass plate, The cutting | disconnection of the glass plate of any one of Claims 1-4 Method. The cutting method of the glass plate of any one of Claims 1-5 which cut | disconnects in the part of the said auxiliary cutting line by pressurization in the said auxiliary cutting process.

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