TW202126427A - Glass plate manufacturing method and glass plate - Google Patents

Abstract

This glass plate manufacturing method includes: a first processing step S1 for processing an end section GE of a glass plate G with a first grindstone 1; and a second processing step S2 for polishing, with a second grindstone 2, the end section GE of the glass plate G that has undergone the first processing step S1. In the second processing step S2, while the second grindstone 2 is relatively moved in the longitudinal direction of the end section GE of the glass plate G, the second grindstone 2 is relatively moved in the thickness direction of the glass plate G.

Description

Manufacturing method of glass plate and glass plate

The invention relates to a glass plate and a manufacturing method thereof.

Displays such as liquid crystal displays or organic electroluminescence (EL) displays use glass plates. If the end of the glass plate is damaged, cracks or the like will occur from the loss. Therefore, in order to prevent this, the end of the glass plate is ground and polished.

For example, Patent Document 1 discloses a processing method of a glass plate, which includes: a grinding process step of conveying the glass plate in a specific direction, and using a grinding wheel to chamfer the end of the glass plate; and a grinding process step, using grinding The grinding wheel grinds the end of the chamfered glass plate. Prior art literature Patent literature

Patent Document 1: Japanese Patent Laid-Open No. 2018-103320

[The problem to be solved by the invention] For example, when a glass plate is used as a substrate for a display, in the step of manufacturing an electronic device on the substrate, the end of the glass plate may be pressed against a pin or a roller for positioning. At this time, if damage remains at the end of the glass plate, glass frit is likely to be generated. If the glass frit adheres to the surface of the glass plate, it will cause defective disconnection of the electronic device. Therefore, it is expected to further improve the surface properties of the end of the glass plate.

However, if the surface properties of the entire end of the glass plate are improved, the entire end becomes a mirror surface, and when the end of the glass plate is photographed with a camera, it becomes difficult to detect the end.

The present invention was completed in view of the above-mentioned circumstances, and its technical problem is to reduce the generation of glass frit at the end of the glass plate and to be able to detect it with a camera. [Means to solve the problem]

The present invention is to solve the above-mentioned problem, which is a method of manufacturing a glass plate having a surface and an end, characterized in that the end of the glass plate has an end surface, and the end surface and the surface The method includes: a first processing step, using a first grinding wheel to process the end of the glass plate; and a second processing step, using a second grinding wheel to pass through the first The end portion of the glass plate in the processing step is ground, and in the second processing step, while the second grinding wheel is relatively moved along the length direction of the end portion of the glass plate, the The second grinding wheel relatively moves with respect to the thickness direction of the glass plate.

According to this structure, in the second processing step, by relatively moving the second grinding wheel along the length direction of the end of the glass plate and relatively moving in the thickness direction of the glass plate, the end surface is mainly processed, and the surface of the end surface is rough. The degree becomes smaller than the surface roughness of the connection surface. Since the positioning pins or rollers are in contact with the end surface with a small surface roughness, the production of glass powder can be reduced. In addition, when the end of the glass plate is photographed with a camera, although the end surface is mirror-like, the connection surface is non-mirror-like, so the end can be detected based on the connection surface.

Here, if the entire end of the glass plate is polished, the abrasive grains are likely to be melted due to the heat of processing, and the wear of the grinding wheel is increased, or the surface properties are conversely deteriorated. Since the end surface is mainly processed in the second processing step, the processing heat can be reduced and the melting loss of the abrasive grains can be suppressed. Therefore, the consumption of the grinding wheel can be reduced, and the surface properties of the end face can be further improved.

In the manufacturing method of the glass plate of the present invention, the second grinding wheel may have a groove portion that grinds the end surface of the glass plate, and the groove portion may have contact with the end surface of the glass plate. The bottom of the groove and the restriction surface connected to the bottom and contactable with the connecting surface, the bottom of the groove has a width greater than the thickness of the end surface of the glass plate, and the first The width of the bottom before the second processing step is smaller than the sum of the thickness of the end surface and the relative movement distance of the second grinding wheel in the thickness direction.

According to this structure, by setting the width of the bottom of the groove of the second grinding wheel to the above range, during the relative movement of the second grinding wheel with respect to the glass plate, the bottom of the groove can be preferably used to grind the glass plate. The end surface, and the connection surface of the glass plate is in contact with the restriction surface of the groove. Thereby, when manufacturing a some glass plate, the edge part can be processed stably.

In the manufacturing method of the glass plate of the present invention, before the second processing step is performed, the second grinding wheel may have an outer peripheral surface without grooves formed, and in the second processing step, by the The outer peripheral face of the second grinding wheel grinds the end of the glass plate.

If grooves are formed on the outer peripheral surface of the second grinding wheel, only the grooves in the outer peripheral surface can be used for processing, and the number of glass plates that can be processed by the second grinding wheel alone is reduced. If a second grinding wheel having an outer peripheral surface without grooves is used, most of the outer peripheral surface can be used for processing, and the number of glass plates that can be processed by the second grinding wheel alone can be greatly increased.

The present invention is to solve the above-mentioned problem, and it is a glass plate having a surface and an end, and the end has an end surface and a connecting surface formed between the end surface and the surface, so The surface roughness Ra1 of the end surface is smaller than the surface roughness Ra2 of the connecting surface.

According to this structure, the strength of the end surface of the glass plate can be increased, and the product quality can be improved. In addition, since the positioning pins or rollers are in contact with the end surface with a small surface roughness, the generation of glass powder can be reduced. Furthermore, when the end portion of the glass plate is photographed with a camera, although the end surface is mirror-like, the connection surface is non-mirror-like. Therefore, the end portion can be detected based on the connection surface.

In the glass plate, the ratio Ra1/Ra2 of the surface roughness Ra1 of the end surface to the surface roughness Ra2 of the connection surface may be 0.15 to 0.6. According to this structure, since the difference in reflectance between the end surface and the connection surface becomes large, when the end of the glass plate is photographed with a camera, it becomes easy to detect the end based on the connection surface.

In addition, the surface roughness Ra1 of the end surface may be 0.06 μm or less. According to this structure, it is possible to reliably reduce the generation of glass frit accompanying the contact of the positioning pin or the roller. [Effects of the invention]

According to the present invention, for the end of the glass plate, the generation of glass powder can be reduced, and the camera can be used for detection.

Hereinafter, a mode for implementing the present invention will be described with reference to the drawings. 1 to 12 show the first embodiment of the method of manufacturing the glass plate of the present invention.

In the following examples, the case of manufacturing a rectangular glass plate G having four sides is described, but the shape of the glass plate G is not limited to this embodiment. The glass plate G is formed by a well-known forming method such as a float method, an overflow down-draw method, or an orifice down-draw method, and is cut into a specific size. The thickness T of the glass plate G is set to 0.2 to 10 mm, and the size of the glass plate G is set to 200 mm×300 mm to 3100 mm×3500 mm, but it is not limited to this range. Moreover, as the composition of the glass plate G, alkali-free glass or aluminosilicate glass is preferable. Here, "alkali-free glass" is a glass that does not substantially contain an alkaline component (alkali metal oxide), specifically, a glass whose weight ratio of the alkaline component is 1000 ppm or less. The weight ratio of the alkaline component is preferably 500 ppm or less, more preferably 300 ppm or less.

As shown in FIG. 1, the glass plate G has a first surface GS1, a second surface GS2, and an end GE corresponding to each side. In this embodiment, the case where the edge part GE of the two parallel sides of the four sides of the glass plate G is processed is illustrated. Each end GE of the glass plate G includes a processing start end GEa and a processing end GEb.

As shown in FIG. 1, the method includes: a first processing step S1, using the first grinding wheel 1 to process the end portion GE of the glass plate G; and a second processing step S2, after the first processing step S1 by The second grinding wheel 2 processes the end GE of the glass plate G. Furthermore, XYZ in the figure is an orthogonal coordinate system. The X-axis direction and the Y-axis direction are horizontal, and the Z-axis direction is the vertical direction (up and down direction).

In the first processing step S1 and the second processing step S2, by relatively moving the grinding wheels 1, 2 and the glass plate G, each end GE of the glass plate G is self-processed along its length direction (X-axis direction) The processing is performed from the start end GEa to the processing end GEb. For example, by moving the glass plate G in the conveying direction GX1, the end portion GE of the glass plate G can be processed by each of the grinding wheels 1 and 2. Alternatively, the end GE of the glass plate G may be processed by moving each of the grinding wheels 1 and 2 in the specific direction GX2.

The first grinding wheel 1 used in the first processing step S1 includes, for example, a pair of rotating grinding wheels. The first grinding wheel 1 is, for example, a grinding wheel for chamfering the end portion GE of the glass plate G. As the first grinding wheel 1, for example, an electroplated grinding wheel in which diamond abrasive grains are reinforced by a metal electroplating adhesive, or a metal adhesive grinding wheel in which abrasive grains are reinforced by a metal bond can be preferably used.

The first grinding wheel 1 is configured to be movable in the horizontal direction (X-axis direction and Y-axis direction) and the vertical direction (Z-axis direction) by a moving mechanism. In addition, the first grinding wheel 1 is rotated around its axis RC1 by a driving means such as an electric motor.

As shown in FIGS. 1 and 2, the first grinding wheel 1 has a first groove 3 for processing the end GE of the glass plate G. The first groove 3 has a bottom 3a and inclined surfaces 3b formed on both sides of the bottom 3a. In this embodiment, the first grindstone 1 in which the first groove portion 3 with one step is formed is exemplified, but it is not limited to this structure, and the first groove portion 3 with multiple steps may be formed on the first grindstone 1. In addition, the first processing step S1 may be performed on each end GE of the glass plate G by a plurality of first grinding wheels 1.

As shown in FIG. 2, the end part GE of the glass plate G supplied to the 1st processing step S1 includes the end surface including the corner part GC. In the first processing step S1, the corner GC of each end GE is removed by chamfering of the first grinding wheel 1.

Specifically, as shown in FIG. 3, the 1st grinding wheel 1 grinds the edge part GE of the glass plate G through the bottom part 3a and the inclined surface 3b. In this case, the corner GC of the end GE of the glass plate G is removed by the inclined surface 3b. By performing the first processing step S1, the end GE of the glass plate G becomes one including the end surface ES1 (top) ground by the bottom 3a of the first grinding wheel 1 and the connecting surface ES2 ground by the inclined surface 3b of the first grinding wheel 1 .

The end surface ES1 is configured into a flat surface shape or a curved surface shape following the shape of the bottom 3a of the first grinding wheel 1. The connecting surface ES2 is a boundary portion formed between the end surface ES1 and the respective surfaces GS1 and GS2 of the glass plate G. The connecting surface ES2 is configured in a curved shape so as to connect the respective surfaces GS1 and GS2 of the glass plate G and the end surface ES1.

The second grinding wheel 2 used in the second processing step S2 includes, for example, a pair of rotating grinding wheels that grind the end surface ES1 of the glass plate G. As the second grinding wheel 2, it is preferable to use a resin binder grinding wheel using a resin binder (resin binder) as a binder of abrasive grains.

As the resin binder, a thermosetting resin is preferably used. As specific examples, phenol resins, epoxy resins, polyimide resins, polyurethane resins, etc. can be used as the resin binder.

As the abrasive particles bonded to the second grinding wheel 2, one can be selected from diamond particles, alumina particles, silicon carbide particles, cubic boron nitride particles, metal oxide particles, metal carbide particles, metal nitride particles, etc. Or choose two or more and mix them to use. The particle size of the abrasive grains is, for example, #1000 to 3000, but it is not limited to this range.

The second grinding wheel 2 is configured to be movable in the horizontal direction (X-axis direction, Y-axis direction) and the vertical direction (Z-axis direction) by a moving mechanism. In addition, the second grinding wheel 2 is rotated around its axis RC2 by a driving means such as an electric motor.

As shown in FIG. 4, the 2nd grinding wheel 2 has the 2nd groove part 4 which grind|polished the edge part GE of the glass plate G on the outer peripheral surface 2a. The second groove portion 4 can receive substantially all of the end GE of the glass plate G, and the width dimension W1 of the second groove portion 4 is greater than the thickness dimension T of the glass plate G. The second groove portion 4 has a bottom portion 4a that is in contact with the end surface ES1 of the glass plate G, and a pair of restriction surfaces 4b formed to be connected to both sides of the bottom portion 4a. Furthermore, the second groove portion 4 may also be configured to receive a part of the end portion GE of the glass plate G (for example, the end surface ES1 and the end surface ES1 side connecting surface ES2). In this case, the width dimension W1 of the second groove portion 4 is greater than the maximum thickness of the portion of the end portion GE received by the second groove portion 4.

The bottom portion 4a is configured in a curved shape or a flat surface shape so as to correspond to the end surface ES1 of the glass plate G. The restriction surface 4b is configured in a curved surface shape so as to correspond to the connection surface ES2 of the glass plate G.

The width dimension W2 of the bottom 4a is larger than the thickness T1 of the end surface ES1 of the glass plate G. The width dimension W2 of the bottom part 4a is preferably set to be 1 to 2.5 times the thickness dimension T1 of the end surface ES1 of the glass plate G (T1≦W2≦2.5T1).

In this embodiment, the second grindstone 2 in which the second groove portion 4 with one step is formed is exemplified, but it is not limited to this structure, and the second grindstone 2 may be formed with the second groove portion 4 of multiple steps. In addition, the second processing step S2 may be performed on each end GE of the glass plate G by a plurality of second grinding wheels 2.

In the second processing step S2, the second grinding wheel 2 is relatively moved in the longitudinal direction (X-axis direction) of the end GE from the processing start end GEa of the glass plate G toward the processing end GEb, and the second grinding wheel 2 It moves relatively with respect to the thickness direction (Z-axis direction) of the glass plate G.

FIG. 5 shows the movement trajectory of the second grinding wheel 2 in the second processing step S2. The second grinding wheel 2 moves relative to the glass plate G in the X-axis direction from the processing start position XS through the first intermediate position XM1 and the second intermediate position XM2 to the processing end position XE. The processing start end GEa of the glass plate G is in contact with the second groove portion 4 of the second grinding wheel 2 at the processing start position XS. At the processing end position XE, the second grinding wheel 2 reaches the processing end GEb of the glass plate G.

The second grinding wheel 2 reciprocates in the Z-axis direction during the movement in the X-axis direction from the processing start position XS to the processing end position XE. That is, the second grindstone 2 moves (rises) a distance L1 from the reference position Z0 in the Z-axis direction to reach the first position Z1. After that, it moves (descends) the same distance L1 to return to the reference position Z0, and then moves (descends) a distance L2 from the reference position Z0 to reach the second position Z2.

In this embodiment, the movement distance L1 from the reference position Z0 to the first position Z1 is equal to the distance L2 from the reference position Z0 to the second position Z2, but it is not limited to this relationship.

In this case, the sum (L1+L2) of the movement distance L1 and the movement distance L2 from the reference position Z0 becomes the movement range of the second grinding wheel 2 in the Z-axis direction. Preferably, the width dimension W1 of the second groove portion 4 of the second grinding wheel 2 before (initial) second processing step S2 is performed is smaller than the sum of the moving range (L1+L2) and the thickness dimension T of the glass plate G (W1<(L1+L2+T) )). Furthermore, it is preferable that the width dimension W2 of the bottom 4a of the second groove 4 before the second processing step S2 (initial) is smaller than the sum (W2) of the moving range (L1+L2) and the thickness dimension T1 of the end surface ES1 of the glass plate G ＜(L1 ten L2 ten T1)).

Hereinafter, the specific operation state of the second grinding wheel 2 in the second processing step S2 will be described with reference to FIGS. 5 to 8.

As shown in FIG. 5, at the machining start position XS, the second grinding wheel 2 is arranged at the reference position Z0 in the Z-axis direction.

As shown in FIG. 6, when the processing start end GEa of the glass plate G reaches the second grinding wheel 2, the groove width direction (Z axis direction) of the bottom 4a in the second groove 4 of the second grinding wheel 2 at the reference position Z0 The center part of the glass plate G is in contact with the end surface ES1 of the glass plate G. In this case, the connection surface ES2 of the glass plate G is not in contact with the restriction surface 4b of the second groove 4. That is, a gap is formed between the connection surface ES2 and the restriction surface 4b of the second groove 4.

As shown in FIG. 5, the second grinding wheel 2 rises at a constant speed from the reference position Z0 in the Z-axis direction while moving from the machining start position XS to the first intermediate position XM1, and reaches the first position Z1. During this movement, the glass plate G is in a state where only the end surface ES1 is in contact with the bottom portion 4a of the second groove portion 4 of the second grindstone 2.

When the second grinding wheel 2 reaches the first position Z1, the connecting surface ES2 on the second surface GS2 side of the glass plate G is the same as the restriction surface 4b on the lower side of the second groove 4 at the first position Z1 as shown in FIG. get in touch with. In this case, the glass plate G is elastically deformed in the Z-axis direction by pressing the connection surface ES2 against the restriction surface 4b. Thereby, the connection surface ES2 on the second surface GS2 side of the glass plate G is polished by the restriction surface 4b of the second groove 4.

Thereafter, the second grinding wheel 2 moves at a constant speed from the first position Z1 to the reference position Z0 in the Z-axis direction while moving from the first intermediate position XM1 to the second intermediate position XM2. Furthermore, as shown in FIG. 5, the 2nd grindstone 2 moves in the Z-axis direction from the reference position Z0 to the second position Z2 at a constant speed while moving from the second intermediate position XM2 to the processing end position XE.

During the movement of the second grinding wheel 2 from the first position Z1 (first intermediate position XM1) to the second position Z2 (processing end position XE), the glass plate G becomes only the end surface ES1 and the second groove 4 of the second grinding wheel 2 The bottom 4a is in contact.

When the second grinding wheel 2 reaches the second position Z2, the connecting surface ES2 on the first surface GS1 side of the glass plate G comes into contact with the upper limit surface 4b of the second groove 4 at the second position Z2 as shown in FIG. . In this case, the glass plate G is elastically deformed in the Z-axis direction by pressing the connection surface ES2 against the restriction surface 4b. Thereby, the connection surface ES2 on the side of the first surface GS1 of the glass plate G is polished by the restriction surface 4b of the second groove 4.

In the second processing step S2, the end surface ES1 is mainly processed. Therefore, the surface roughness Ra1 (arithmetic mean roughness) of the end surface ES1 in the glass plate G after the second processing step S2 is completed becomes smaller than the surface roughness of the connecting surface ES2 Ra2 (arithmetic average roughness). Preferably, the ratio Ra1/Ra2 of the surface roughness Ra1 of the end surface ES1 to the surface roughness Ra2 of the connection surface ES2 is 0.15 to 0.6. It is preferable to set the surface roughness Ra1 of the end surface ES1 to 0.03 to 0.06 μm. It is preferable to set the surface roughness Ra2 of the connection surface ES2 to 0.1 to 0.2 μm.

In the present invention, the surface roughness Ra1 of the end surface ES1 is performed at a number of different positions in the length direction of the end surface ES1 (for example, the periphery of the processing start position XS, the periphery of the processing end position XE, and the periphery of the intermediate positions). Measure, and take the average of these. In addition, the surface roughness Ra2 of the connection surface ES2 is measured at a plurality of different positions in the longitudinal direction of the end surface ES1, and the maximum value thereof is taken.

9 and 10 show other examples of the movement trajectory of the second grinding wheel 2 in the second processing step S2.

In the example shown in FIG. 9, the second grinding wheel 2 moves from the processing start position XS to the processing end position XE, and passes through the first intermediate position XM1 to the fifth intermediate position XM5.

During the movement from the machining start position XS to the first intermediate position XM1, the second grinding wheel 2 does not move in the Z-axis direction (to maintain the state of the reference position Z0), but relatively moves in the X-axis direction. The second grinding wheel 2 moves (rises) from the reference position Z0 to the first position Z1 in the Z-axis direction during the movement from the first intermediate position XM1 to the second intermediate position XM2. During the movement of the second grinding wheel 2 from the machining start position XS to the second intermediate position XM2 through the first intermediate position XM1, only the end surface ES1 of the glass plate G is ground by the bottom 4a of the second groove 4.

During the movement from the second intermediate position XM2 to the third intermediate position XM3, the second grinding wheel 2 relatively moves in the X-axis direction while maintaining the first position Z1 in the Z-axis direction. During this movement, the end surface ES1 of the glass plate G is polished by the bottom 4 a of the second groove 4, and the connecting surface ES2 on the second surface GS2 side is polished by the lower restriction surface 4 b of the second groove 4.

The second grinding wheel 2 moves from the first position Z1 to the reference position Z0 in the Z-axis direction during the movement from the third intermediate position XM3 to the fourth intermediate position XM4. At the time of this movement, the connecting surface ES2 on the second surface GS2 side of the glass plate G is away from the restricting surface 4b of the second groove 4.

The second grinding wheel 2 moves in the Z-axis direction from the reference position Z0 to the second position Z2 during the movement from the fourth intermediate position XM4 to the fifth intermediate position XM5. During the movement of the second grinding wheel 2 from the third intermediate position XM3 to the fifth intermediate position XM5 via the fourth intermediate position XM4, only the end surface ES1 of the end GE of the glass plate G is ground by the bottom 4a of the second groove 4.

During the movement from the fifth intermediate position XM5 to the machining end position XE, the second grinding wheel 2 relatively moves in the X-axis direction while maintaining the second position Z2 in the Z-axis direction. During this movement, the end surface ES1 of the glass plate G is polished by the bottom 4 a of the second groove 4, and the connecting surface ES2 on the first surface GS1 side is polished by the upper restriction surface 4 b of the second groove 4.

In the example shown in FIG. 10, the second grinding wheel 2 passes through the first intermediate position XM1 to the eighth intermediate position XM8 while moving from the processing start position XS to the processing end position XE.

The second grinding wheel 2 moves from the reference position Z0 to the second position Z2 in the Z-axis direction while moving from the machining start position XS to the first intermediate position XM1. The second grinding wheel 2 moves in the Z-axis direction from the second position Z2 to the reference position Z0 during the movement from the first intermediate position XM1 to the second intermediate position XM2.

The second grinding wheel 2 moves from the reference position Z0 to the first position Z1 in the Z-axis direction during the movement from the second intermediate position XM2 to the third intermediate position XM3. The second grinding wheel 2 moves from the first position Z1 to the reference position Z0 in the Z-axis direction during the movement from the third intermediate position XM3 to the fourth intermediate position XM4. The second grinding wheel 2 periodically repeats the same movement as described above while moving from the fourth intermediate position XM4 to the fifth intermediate position XM5, the sixth intermediate position XM6, the seventh intermediate position XM7, and the eighth intermediate position XM8.

If the second processing step S2 is repeatedly performed on a plurality of glass plates G, the depth of the second groove 4 of the second grinding wheel 2 will increase due to the shedding of abrasive grains. FIG. 11 is a cross-sectional view of the second grinding wheel 2 when the second processing step S2 is executed multiple times. In this case, the depth dimension D1 of the second groove portion 4 is deeper than the initial depth dimension D0.

FIG. 12 is a cross-sectional view of the second grinding wheel 2 when the second processing step S2 is further performed multiple times by the second groove 4 shown in FIG. 11. In this case, the depth dimension D2 of the second groove portion 4 is further deeper than the depth dimension D1 in FIG. 11. As shown in FIG. 12, the bottom portion 4a of the second groove portion 4 is gradually deformed from the initial curved shape to an increase in the radius of curvature by repeating the second processing step S2, that is, close to the flat surface shape.

As described above, in the second processing step S2, the second grinding wheel 2 is relatively moved in the Z-axis direction in such a way that the restricting surface 4b of the second groove portion 4 inevitably contacts the connecting surface ES2 of the glass plate G. Thereby, as described above, even when the second processing step S2 is repeatedly performed, the reduction in the width dimension W2 of the bottom 4a can be suppressed, and the processing accuracy of the end surface ES1 of the end GE in each glass plate G can be reduced. Maintained as fixed.

The glass plate manufactured in the manner described above is supplied to, for example, a manufacturing step of a display panel. In the step of manufacturing the electronic device on the first surface GS1, for example, there is a case where the position of the end GE is detected by photographing the end GE with a camera. In this case, the captured image of the end portion GE shows the end surface ES1 and the connection surface ES2 with different surface roughness Ra1 and surface roughness Ra2. As described above, by implementing the second processing step S2, the surface roughness Ra1 of the end surface ES1 of the end portion GE of the glass plate becomes smaller than the surface roughness Ra2 of the connection surface ES2. Thereby, in the captured image, the end surface ES1 and the connection surface ES2 can be easily distinguished. Moreover, since the connection surface ES2 which is the boundary part of each surface GS1 of the glass plate G and the edge part GE can be identified easily, it is easy to detect the edge part GE in an image.

In addition, in the step of manufacturing the electronic device on the first surface GS1, the positioning pin or the roller may be in contact with the end surface ES1 of the glass plate G. Because the surface roughness Ra of the end surface ES1 is small, the production of glass frit caused by the contact can be reduced.

According to the manufacturing method of the glass plate G of the present embodiment described above, the end GE of the glass plate G is polished in the second processing step S2, whereby the end GE of the glass plate G can be reduced in glass powder It is easy to use the camera to detect.

If the width dimension W2 of the bottom 4a of the second groove portion 4 of the second grinding wheel 2 is made larger than the thickness dimension T1 of the end surface ES1 of the glass plate G, the new second grinding wheel 2 can be efficiently replaced when the second grinding wheel 2 is replaced. Alignment of two grinding wheels 2.

FIGS. 13 to 17 show the second embodiment of the method of manufacturing the glass plate of the present invention. In this embodiment, the implementation of the second processing step is different from the first embodiment.

As shown in FIG. 13, the outer peripheral surface 2a of the second grinding wheel 2 before the execution of the second processing step S2 (unused) is not formed with the second groove 4 exemplified in the first embodiment.

As shown in FIG. 14, in the first second processing step S2 in this embodiment, if the first glass plate G1 is in contact with the outer peripheral surface 2a, the second grinding wheel 2 is opposed to the glass plate G1 in the same manner as in the first embodiment. , The processing start end GEa to the processing end GEb relatively move in the longitudinal direction (X-axis direction) of the end GE, and relatively move with respect to the Z-axis direction (the thickness direction of the first glass plate G1). As shown in FIG. 15, through the first second processing step S2, a second groove portion 4 having a width dimension W3 and a depth dimension D3 is formed in the second grinding wheel 2.

The depth dimension D3 of the second groove portion 4 is smaller than the initial depth dimension D0 of the second groove portion 4 in the first embodiment. That is, the second groove portion 4 of the first embodiment has the function of restricting the end portion GE of the glass plate G when the restriction surface 4b of the glass plate G is processed, but the second groove portion 4 of the present embodiment does not have this function .

When performing the second processing step S2 for the second time, as shown in FIG. 15, the second grinding wheel 2 overlaps with one end (upper end) in the groove width direction (Z-axis direction) of the second groove 4 The end surface ES1 of the second glass plate G2 is arranged in a manner. In this case, the end surface ES1 of the second glass plate G2 is in contact with the outer peripheral surface 2a of the second grinding wheel 2 where the second groove portion 4 is not formed.

Thereafter, as in the case of processing the first glass plate G1, the second grinding wheel 2 extends from the processing start end GEa of the second glass plate G2 to the processing end GEb along the length direction of the end GE (X-axis direction). ) Relative movement, and relative movement relative to the Z-axis direction as shown in Figure 16. The width of the second groove 4 formed by the processing of the first glass plate G1 is enlarged by the processing of the second glass plate G2. As shown in FIG. 17, the width dimension W4 of the 2nd groove part 4 after processing the 2nd glass plate G2 becomes larger than the width dimension W3 of the 2nd groove part 4 immediately after processing the 1st glass plate G1. In this case, the depth dimension D3 of the second groove portion 4 is substantially the same as after the first second processing step S2 is completed.

In the third second processing step S2, the second grinding wheel 2 is arranged so as to overlap one end in the groove width direction (Z axis direction) of the second groove 4 after processing the second glass plate G2 (refer to Figure 17). In this case, the end surface ES1 of the third glass plate G3 is in contact with the outer peripheral surface 2a of the second grinding wheel 2 where the second groove portion 4 is not formed.

After that, as in the case of processing the second glass plate G2, the second grinding wheel 2 is relatively moved with respect to the thickness direction (Z-axis direction) of the glass plate G3, and the end surface ES1 is polished. Thereby, the second groove portion 4 of the second grinding wheel 2 in the present embodiment first expands its width as the second processing step S2 is repeated. When the second groove portion 4 expands to the entire outer peripheral surface 2a of the second grinding wheel 2, the second grinding wheel 2 is arranged at the same position as the first second processing step S2, and the depth of a part of the second groove portion 4 is increased. Then, the second processing step S2 is repeated while changing the position of the second grinding wheel 2 to thereby make all the second groove portions 4 have the same depth.

The manufacturing method of the glass plates G1 to G3 of this embodiment has the following advantages compared with the first embodiment. If the second groove 4 is formed on the outer peripheral surface 2a of the second grinding wheel 2 as in the first embodiment, only the second groove 4 in the outer peripheral surface 2a can be used for processing, and the second grinding wheel 2 alone can be used for processing the glass plate The number of G blocks is reduced. On the other hand, if the second grinding wheel 2 having the outer peripheral surface 2a without the second groove portion 4 is used as in the present embodiment, most of the outer peripheral surface 2a can be used for processing, and the use of the second grinding wheel can be greatly increased. The number of glass plates G processed by the second grinding wheel 2.

In addition, this invention is not limited to the structure of the said embodiment, and it is not limited to the said effect. The present invention can be variously modified within the scope not departing from the gist of the present invention.

In the above-mentioned embodiment, an example in which the first processing step S1 and the second processing step S2 are performed on the end portions GE on both sides of the rectangular glass plate G is illustrated. However, the present invention may also be applied to the end portions GE on the remaining two sides. invention.

The relative movement of the second grinding wheel 2 in the Z-axis direction in the second processing step S2 can also be performed by moving the glass plate G with respect to the Z-axis direction (thickness direction).

1: The first grinding wheel 2: The second grinding wheel 2a: The outer peripheral surface of the second grinding wheel 3: The first groove 3a: The bottom of the first groove 3b: Inclined surface 4: The second groove 4a: The bottom of the second groove 4b: Restricted surface D0, D1, D2, D3: depth dimension ES1: End face ES2: Connection surface G: Glass plate G1: The first glass plate G2: Second glass plate G3: The third glass plate GC: corner GE: The end of the glass plate GEa: Processing start end GEb: End of processing GS1: First surface GS2: second surface GX1: Conveying direction GX2: specific direction L1, L2: distance RC1: The axis of the first grinding wheel RC2: The axis of the second grinding wheel S1: The first processing step S2: Second processing step T, T1: thickness dimension W1, W2, W3, W4: width dimension XE: Processing end position XM1: first middle position XM2: second middle position XM3: third middle position XM4: Fourth middle position XM5: Fifth middle position XM6: sixth middle position XM7: seventh middle position XM8: Eighth middle position XS: Processing start position Z0: Reference position Z1: first position Z2: second position

Fig. 1 is a perspective view showing a method of manufacturing a glass plate according to the first embodiment. Fig. 2 is a cross-sectional view showing a first grinding wheel and a glass plate. Fig. 3 is a cross-sectional view showing the first processing step. Fig. 4 is a cross-sectional view showing a second grinding wheel and a glass plate. Fig. 5 is a diagram showing the movement trajectory of the second grinding wheel. Fig. 6 is a cross-sectional view showing a second processing step. Fig. 7 is a cross-sectional view showing a second processing step. Fig. 8 is a cross-sectional view showing a second processing step. Fig. 9 is a diagram showing another example of the movement trajectory of the second grinding wheel. Fig. 10 is a diagram showing another example of the movement trajectory of the second grinding wheel. Fig. 11 is a cross-sectional view showing a second processing step. Fig. 12 is a cross-sectional view showing the second processing step. Fig. 13 is a cross-sectional view showing a method of manufacturing a glass plate of the second embodiment. Fig. 14 is a cross-sectional view showing the second processing step. Fig. 15 is a cross-sectional view showing the second processing step. Fig. 16 is a cross-sectional view showing the second processing step. Fig. 17 is a cross-sectional view showing the second processing step.

1: The first grinding wheel

2: The second grinding wheel

2a: The outer peripheral surface of the second grinding wheel

3: The first groove

4: The second groove

G: Glass plate

GE: The end of the glass plate

GEa: Processing start end

GEb: End of processing

GS1: First surface

GS2: second surface

GX1: Conveying direction

GX2: specific direction

RC1: The axis of the first grinding wheel

RC2: The axis of the second grinding wheel

S1: The first processing step

S2: Second processing step

Claims (6)

A method of manufacturing a glass plate, which is a method of manufacturing a glass plate having a surface and an end, characterized in that: The end of the glass plate has an end surface and a connecting surface formed between the end surface and the surface, The manufacturing method of the glass plate includes: a first processing step, using a first grinding wheel to process the end of the glass plate; and a second processing step, using a second grinding wheel to The end of the glass plate is ground, In the second processing step, while relatively moving the second grinding wheel along the length direction of the end of the glass plate, the second grinding wheel is opposed to the thickness direction of the glass plate move. The method of manufacturing a glass plate according to claim 1, wherein the second grinding wheel has a groove for grinding the end surface of the glass plate, The groove portion has a bottom portion that is in contact with the end surface of the glass plate, and a restriction surface that is connected to the bottom portion and can be in contact with the connection surface, The bottom of the groove portion has a larger width than the thickness of the end surface of the glass plate, The width of the bottom before the second processing step is performed is smaller than the sum of the thickness of the end surface and the relative movement distance of the second grinding wheel in the thickness direction. The method for manufacturing a glass plate according to claim 1, wherein before the second processing step is performed, the second grinding wheel has an outer peripheral surface where no groove is formed, In the second processing step, the outer peripheral surface of the second grinding wheel is used to grind the end of the glass plate. A glass plate having a surface and an end, and is characterized in that: The end has an end surface and a connecting surface formed between the end surface and the surface, The surface roughness Ra1 of the end surface is smaller than the surface roughness Ra2 of the connecting surface. The glass plate according to claim 4, wherein the ratio Ra1/Ra2 of the surface roughness Ra1 of the end surface to the surface roughness Ra2 of the connection surface is 0.15 to 0.6. The glass plate according to claim 4 or claim 5, wherein the surface roughness Ra1 of the end surface is 0.06 μm or less.

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