TWI828660B - Manufacturing method and manufacturing device of plate glass - Google Patents

Abstract

A manufacturing method of plate glass, which includes an end-face grinding step of grinding the end face Ga of the plate glass G, and an end-face grinding step of grinding the end face Ga of the plate glass G. In the end-face grinding step, it includes a side with The first grinding step of grinding the end surface Ga of the plate glass G while pressing the first grinding stone 3 with the first pressing force F1, and the first grinding step of grinding the end surface Ga of the plate glass G while pressing the second grinding stone 4 with the second pressing force F2. The end surface Ga of the plate glass G ground by the grinding stone 3 is subjected to the second grinding step of grinding, and the second pressing force F2 is made smaller than the first pressing force F1.

Description

Manufacturing method and manufacturing device of plate glass

The present invention relates to a method for manufacturing plate glass that includes an end surface grinding step of grinding the end surface of the plate glass and an end surface grinding step of grinding the end surface of the plate glass, and a plate glass that can perform both steps. Manufacturing device.

As is well known, cracks remain on the end surface (cut surface) of the plate glass after the cutting step using a scoring wheel. Therefore, in the subsequent steps, the plate glass breaks from the end surface as a starting point, or glass powder is generated from the end surface. reason. In order to avoid such a problem, in the manufacturing process of plate glass, it has become common practice to perform an end surface grinding step of grinding the end surface of the plate glass and an end surface grinding step of grinding the ground end surface of the plate glass (see Patent Document 1 ).

An example of a mode for executing the above two steps is as follows. That is, when performing the end surface grinding step, the grinding grindstone which has the groove which can grind the end surface of the plate glass formed in the peripheral part is used. And by grinding while pressing the grinding stone against the end surface of the plate glass, the shape of the end surface is processed so that it may imitate the shape of the groove. Thereby, the end surface is ground and the ridge line of the end surface is chamfered to form a circular or planar chamfered surface. In addition, when performing the end surface grinding step, the end surface of the plate glass can be ground by using Groove of multiple grinding stones. Furthermore, the end surface including the chamfered surface is finished by grinding while sequentially pressing a plurality of grinding stones against the end surface of the ground glass plate.

[Prior art documents]

[Patent Document]

Patent Document 1: Japanese Patent Publication No. 2014-518169

In addition, in the above-mentioned form, when the end face grinding step and the end face grinding step are performed, cracks are generated every time the grinding stone is pressed against the end face of the ground plate glass, and as a result, there is an end face after the end face grinding step. quality degradation. If the quality of the end surface is degraded, glass powder is likely to be generated from the end surface, which may cause wiring defects when the plate glass is used as a glass substrate for electronic devices. In view of this situation, the present invention aims to suppress cracks remaining on the end surface as much as possible and thereby improve the quality of the end surface as a technical subject.

The present invention, which was pioneered to solve the above-mentioned problems, is a manufacturing method of plate glass, which includes an end-face grinding step of grinding the end face of the plate glass and an end-face grinding step of grinding the ground end face of the plate glass, and its characteristics The end surface grinding step includes a first grinding step of grinding the end surface of the plate glass while pressing the first grinding stone with a first pressing force, and a first grinding step of grinding the end surface of the plate glass while pressing the second grinding stone with a second pressing force. The end of the plate glass after grinding with the first grinding stone The second grinding step of grinding is performed on the surface, and the second pressing force is smaller than the first pressing force.

In the end surface grinding step in this method, a first grinding step of grinding the end surface of the ground plate glass while pressing the first grinding stone with a first pressing force is performed. Furthermore, a second grinding step of grinding the end surface polished with the first grinding stone while pressing the second grinding stone is performed with a second pressing force smaller than the first pressing force. According to the end surface grinding step, the second pressing force is made smaller than the first pressing force, and accordingly cracks generated on the end surface during the second grinding step can be suppressed. Thereby, cracks remaining on the end surface of the obtained plate glass can be suppressed as much as possible, and the quality of the end surface can be improved.

In this method, it is preferable that the Rockwell hardness HRM of the binder which fixes the abrasive grains of the second grindstone is equal to or less than the Rockwell hardness HRM of the binder which fixes the abrasive grains of the first grindstone.

If set in this way, cracks generated on the end surface in the second polishing step can be further suppressed, which is more advantageous in terms of improving the quality of the end surface of the plate glass.

In the method, it is preferable to use phenol resin, polyurethane resin or polyimide resin as the binding agent of the first grinding stone, and use polyurethane resin or epoxy resin Used as a binding agent for the second grinding stone.

If set in this way, the Rockwell hardness HRM of the binder of the second grindstone can be made equal to or less than the Rockwell hardness HRM of the binder of the first grindstone, which is more advantageous in terms of improving the above-mentioned functions and effects. .

In addition, the present invention, which was first created to solve the above-mentioned problems, is a plate glass manufacturing apparatus including a grinding stone for grinding the end surface of the plate glass, and a A grinding stone for grinding the end surface of the plate glass after grinding, characterized in that the grinding stone includes a first grinding stone for grinding the end surface of the plate glass while being pressed by the first pressing force, and The second grinding stone is used to grind the end surface of the plate glass that has been ground by the first grinding stone in a state that has been pressed by the second pressing force, and the second pressing force is smaller than the first pressing force.

According to this device, the same operations and effects as those already described in the description of the manufacturing method of plate glass can be obtained.

According to the present invention, cracks remaining on the end surface can be suppressed as much as possible, and the quality of the end surface can be improved.

1: Plate glass manufacturing equipment

2: Grinding stone

3: First grinding stone

4: Second grinding stone

F1: First pressing force

F2: Second pressing force

G: Plate glass

Ga: end face of plate glass

Gb: End face orthogonal to end face Ga

T, X, Y, Z: direction

FIG. 1 is a plan view showing the manufacturing method and manufacturing apparatus of plate glass according to the embodiment of the present invention.

Hereinafter, the manufacturing method and manufacturing apparatus of the sheet glass which concerns on embodiment of this invention are demonstrated, referring accompanying drawing.

As shown in FIG. 1 , when the manufacturing method of the sheet glass according to the present embodiment is executed, the manufacturing device 1 of the sheet glass according to the present embodiment (hereinafter, simply expressed as the manufacturing device 1 ) is used. The manufacturing device 1 includes a grinding grindstone 2 for grinding the end surface Ga of the plate glass G, a first grinding grindstone 3 for grinding the end surface Ga of the ground plate glass G first, and a second grinding stone for grinding thereafter. Grindstone 4. Here, in this embodiment In the formula, the manufacturing apparatus 1 which grinds and grinds the both end surfaces Ga and Ga extended in the X direction of the rectangular plate glass G in the flat position is given as an example.

The plate glass G is formed by a known forming method such as the float method, the overflow down-draw method, or the orifice down-draw method, and is cut into a predetermined size. The thickness of the plate glass G is preferably 0.1mm~1.4mm, more preferably 0.2mm~0.7mm, and most preferably 0.2mm~0.5mm. The plate glass G is preferably a glass substrate used for flat panel displays, touch panels, solar cells, organic electroluminescence (EL) lighting, and the like. Examples of flat-panel displays using glass substrates include liquid crystal displays and organic EL displays.

In order to process both end surfaces Ga and Ga of the plate glass G, the grinding stone 2 , the first grinding stone 3 , and the second grinding stone 4 are each arranged in a pair with the plate glass G sandwiched between them. The grinding grindstone 2 , the first grinding grindstone 3 , and the second grinding grindstone 4 are arranged side by side in the direction along each end surface Ga of the plate glass G. Each pair of the grinding grindstone 2, the first grinding grindstone 3, and the second grinding grindstone 4 moves in a synchronized state in the T direction parallel to the The plate glass G is processed on the platform shown. Grooves (not shown) for processing the end surface Ga are formed in multiple stages up and down on the outer peripheral portion (rotating peripheral portion) of the grindstone 2, the grindstone 3, and the grindstone 4. The end surface Ga is processed by pressing one of the plurality of grooves against the end surface Ga. In addition, the rotation direction of the grindstones 2, 3, and 4 when viewed from the Z direction (viewed from above) may be clockwise or counterclockwise.

The grinding stone 2 is used to form the cross-sectional shape of the end face Ga (with respect to the X direction The grindstone has a shape of orthogonal cross section), and the end surface Ga is processed in a state where the position in the Y direction is fixed. In contrast, the first grinding stone 3 and the second grinding stone 4 are grinding stones for finishing the ground end surface Ga, and the end surface Ga is pressed against the end surface Ga with a fixed pressing force. for processing. Furthermore, the grinding grindstone 2 may grind the end surface Ga in a state where it is pressed toward the end surface Ga with a fixed pressing force.

Here, if the first pressing force F1 that presses the first grindstone 3 against the end surface Ga is compared with the second pressing force F2 that presses the second grindstone 4 against the end surface Ga, the second pressing force F2 is more Small. The "pressing force" mentioned here refers to the force acting parallel to the Y direction, and the unit is expressed in [N]. From the viewpoint of further suppressing cracks generated on the end surface Ga, the second pressing force F2 is preferably 0.8 times or less of the first pressing force F1, more preferably 0.6 times or less. In addition, from the viewpoint of ensuring the polishing amount using the second grindstone 4, the second pressing force F2 is preferably 0.1 times or more of the first pressing force F1, and more preferably 0.2 times or more.

The first pressing force F1 is preferably 30N~100N, and more preferably 40N~80N. The second pressing force F2 is preferably 3N~80N, more preferably 5N~40N, and most preferably 10N~30N.

The grinding grindstone 2 is preferably a metal bond grindstone using a metal bond as a binder for the abrasive grains. The metal used as a binder is preferably one selected from the group consisting of iron, copper, cobalt, nickel, tungsten, etc., or a mixture of two or more selected, and one containing iron is particularly preferred. The abrasive grains combined with the grinding grindstone 2 are preferably diamond abrasive grains, and the particle size is preferably #300~#600.

The first grinding grindstone 3 and the second grinding grindstone 4 are preferably resin bond grindstones using a resin bond as a binder for the abrasive grains. As the resin binder, a thermosetting resin is preferably used. As specific examples, phenol resin, epoxy resin, polyimide resin, polyurethane resin, etc. can be used as the resin binder. As the abrasive grains combined with the first grinding stone 3 and the second grinding stone 4, diamond particles, alumina particles, silicon carbide particles, cubic boron nitride particles, metal oxide particles, metal carbide particles, Metal nitride particles, etc. The particle size of the abrasive grains is preferably #100~#3000, and more preferably #200~#1000.

Here, in order to further suppress cracks generated on the end surface Ga in the second polishing step, the Rockwell hardness HRM of the bond of the second grindstone 4 is equal to or less than the Rockwell hardness HRM of the bond of the first grindstone 3 . In order to satisfy the relationship of the Rockwell hardness HRM, as an example, any one of a phenol resin, a polyurethane resin, and a polyimide resin may be used as the bonding agent of the first grindstone 3 agent, either polyurethane resin or epoxy resin may be used as a binding agent for the second grindstone 4 .

The Rockwell hardness HRM of the binder of the first grinding stone 3 is preferably 50 to 130. In addition, the Rockwell hardness HRM of the binder of the second grinding stone 4 is preferably 50 to 110. Here, the Rockwell hardness HRM of the binder refers to the Rockwell hardness HRM of the binder alone without a filler or the like.

Hereinafter, the manufacturing method of the plate glass using the said manufacturing apparatus 1 is demonstrated.

In this method of manufacturing plate glass, first, conveyance (not shown in the figure) is used After the mechanism (for example, a belt conveyor, etc.) carries the plate glass G to the position where the platform is installed, the plate glass G is fixed to the platform. The sheet glass G is glass that has undergone a cutting step, and both end surfaces Ga and Ga are respectively cut surfaces formed by the cutting step.

Next, an end surface grinding step of grinding the end surface Ga of the plate glass G and an end surface grinding step of grinding the ground end surface Ga of the plate glass G are performed.

In the end surface grinding step, the end surface Ga of the plate glass G as the cut surface is ground using the grinding stone 2 . Thereby, the cross-sectional shape of the end face Ga is formed. In the end surface grinding step, the first grinding step of grinding the end surface Ga of the ground plate glass G while pressing the first grinding stone 3 with the first pressing force F1 is performed, and the first grinding step of grinding the end surface Ga with the second pressing force F2 is performed. A second grinding step in which the second grindstone 4 grinds the end surface Ga of the plate glass G polished by the first grindstone 3 . Thereby, finishing processing for reducing the surface roughness of the end surface Ga is performed. When the processing of the entire length of the end surface Ga of the grinding stone 2 , the first grinding stone 3 , and the second grinding stone 4 is completed, the end surface grinding step and the end surface grinding step are completed. Furthermore, the quality of the end surface Ga after the end surface grinding step can be evaluated based on the size of the surface roughness Ra, for example.

After the end surface grinding step and the end surface grinding step are completed, after the fixation of the plate glass G on the platform on which the grinding process and the grinding process of the end surface Ga have been completed is released, the plate glass G is again moved out from the position where the platform is installed and sent by using the transport mechanism. to downstream steps. In the downstream step, for example, in the same manner as the end face grinding step and the end face grinding step, the end face Gb orthogonal to the end face Ga is ground and polished. Thereafter, the plate glass G is subjected to a cleaning process.

Hereinafter, the main functions and effects of the manufacturing method of the plate glass and the manufacturing apparatus 1 will be described.

According to the manufacturing method and manufacturing device 1 of the plate glass, the second pressing force F2 is made smaller than the first pressing force F1, and accordingly, cracks generated on the end surface Ga in the second polishing step can be suppressed. Thereby, the crack remaining in the end surface Ga of the obtained sheet glass G can be suppressed as much as possible, and the quality of the end surface Ga can be improved.

Here, the manufacturing method and manufacturing apparatus of the plate glass of this invention are not limited to the form or structure demonstrated in the said embodiment. For example, in addition to the first grinding stone 3 and the second grinding stone 4, a new grinding stone may be introduced. After grinding the end surface Ga with the grinding grindstone 2 and before grinding the end surface Ga with the first grinding grindstone 3, the end surface Ga can be ground with this new grinding grindstone (third grinding grindstone). of grinding. In this case, the third pressing force for pressing the third grinding stone against the end surface Ga may be smaller than the first pressing force F1, or may be larger than the first pressing force F1. The reason is that the cracks generated on the end surface Ga during the grinding process using the third grinding stone can be roughly removed by the first grinding step and the second grinding step, and have little impact on the quality of the end surface Ga.

In addition, in the above embodiment, only a pair of grinding stones 2 is used, but the invention is not limited to this. It is also possible to use two or more pairs of grinding stones 2 to perform the grinding step.

In addition, in the above embodiment, each pair of the grinding stone 2, the first grinding stone 3, and the second grinding stone 4 processes both end surfaces Ga and Ga in a synchronized state, but the invention is not limited to this. . The grinding grindstone 2, the first grinding grindstone 3, and the second grinding grindstone 4 may not form a pair, and only one end surface Ga may be processed. For this reason In this case, multiple grinding stones 2 can also be used. In addition, each pair of the grinding stone 2, the first grinding stone 3, and the second grinding stone 4 may be asynchronous, and the end surface Ga on one side may be processed after the end surface Ga on the other side is processed.

1‧‧‧Plate glass manufacturing equipment

2‧‧‧Grinding stone

3‧‧‧The first grinding stone

4‧‧‧The second grinding stone

F1‧‧‧First pressing force

F2‧‧‧The second pressing force

G‧‧‧plate glass

End face of Ga‧‧‧plate glass

Gb‧‧‧The end face orthogonal to the end face Ga

T, X, Y, Z‧‧‧ direction

Claims (3)

A method for manufacturing plate glass, which includes an end surface grinding step of grinding an end surface of the plate glass using a grinding stone, and an end surface grinding step of grinding the ground end surface of the plate glass, It is characterized in that the end surface grinding step includes a first grinding step of grinding the end surface of the plate glass while pressing the first grinding stone with a first pressing force, and a second grinding step of grinding the end surface of the plate glass while pressing the first grinding stone with a second pressing force. A second grinding step in which a grindstone faces the end surface of the plate glass that has been ground by the first grindstone, and the grinding grindstone, the first grinding grindstone, and the second grinding stone The grinding grindstones are arranged side by side in the direction along the end surface of the plate glass, and the grinding grinding stones are metal bond grindstones using a metal bond as a binder for abrasive grains, the first grinding grindstone and The second grinding stone is a resin bonded grindstone using a resin bond as a binder for abrasive grains, and the second pressing force is set to 0.8 to 0.1 times the size of the first pressing force. times, the Rockwell hardness HRM of the binder that fixes the abrasive grains of the second grindstone is set to be equal to or less than the Rockwell hardness HRM of the binder that fixes the abrasive grains of the first grindstone. The manufacturing method of plate glass as described in item 1 of the patent application, wherein phenol resin, polyurethane resin or polyimide resin is used as the first grinding The bonding agent of the grindstone, and polyurethane resin or epoxy resin is used as the bonding agent of the second grinding stone. A manufacturing device for plate glass, which includes a grinding stone for grinding the end surface of the plate glass and a grinding stone for grinding the ground end surface of the plate glass, characterized in that: The grinding stone includes a first grinding stone for grinding the end surface of the plate glass while being pressed by the first pressing force, and a grinding stone for grinding the end surface of the plate glass while being pressed by the second pressing force. and a second grinding stone for grinding the end surface of the plate glass after the first grinding stone has ground it. The grinding grinding stone, the first grinding grinding stone, and the second grinding grinding stone are along the The direction of the end faces of the plate glass is arranged side by side, and the size of the second pressing force is set to 0.8 times to 0.1 times the size of the first pressing force. The grinding stone is made of a metal bonding agent. A metal-bonded grindstone is a binder for abrasive grains. The first grindstone and the second grindstone are resin-bonded grindstones using a resin binder as a binder for abrasive grains, which will fix the The Rockwell hardness HRM of the binder of the abrasive grains of the second grindstone is equal to or less than the Rockwell hardness HRM of the binder that fixes the abrasive grains of the first grindstone.