TWI828669B - Manufacturing method and manufacturing device of plate glass - Google Patents

Abstract

A method for manufacturing 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. The end-face grinding step includes one side with a first press The first grinding step of grinding the end surface Ga of the plate glass G while pressing the first grinding stone 3 with the pressure F1, and the use of the first grinding stone while pressing the second grinding stone 4 with the second pressing force F2. 3. Perform the second polishing step of polishing the end surface Ga of the polished plate glass G, and make the second pressing force F2 larger 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.

existing technical documents patent documents

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

However, in the above-described form, the later the grinding stone grinds the end surface of the plate glass, the easier it is for the grindstone to idle between the end surface and the end surface. In other words, the abrasive grains of the grinding stone are not sufficiently sunk into the end surface. The end face becomes underground. Due to the above-mentioned idling, the surface roughness of the end surface after the end surface grinding step cannot be sufficiently reduced, and the quality of the end surface may be degraded. If the quality of the end surface decreases, 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 components. In view of this situation, the present invention aims to suppress the idling of the grinding stone 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 method of manufacturing plate glass, which includes an end-face grinding step of grinding the end surface of the plate glass, and an end-face grinding step of grinding the ground end surface of the plate glass, wherein: 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 with a second pressing force while pressing the second grinding stone with a second pressing force. The grinding stone performs a second grinding step of grinding the end surface of the plate glass ground with the first grinding stone, and the second pressing force is greater 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 under a second pressing force greater than the first pressing force. As described above, if the second pressing force is greater than the first pressing force, it will be difficult to cause idling of the second grinding stone in the second grinding step. In other words, the abrasive grains of the grindstone are appropriately sunk into the end surface, and the end surface can be sufficiently polished. As a result, the quality of the end surface after the end surface grinding step can be improved.

In the method, it is preferable to set the magnitude of the second pressing force to 1.2 times to 7 times the magnitude of the first pressing force.

If set in this way, it is more difficult for the second grinding stone to idle, which is more advantageous in improving the quality of the end surface.

In the method, it is preferable that the hardness of the abrasive grains of the second grinding stone is lower than the hardness of the abrasive grains of the first grinding stone.

If set in this way, in the second polishing step, cracks generated on the end surface of the plate glass due to large pressing force can be reduced. As a result, it becomes more advantageous in improving the quality of the end surface.

In the above method, the particle size of the abrasive grains of the second grinding stone may be smaller than the particle size of the abrasive grains of the first grinding stone.

The smaller the particle size of the abrasive grains, the easier it is for the grindstone to idle. because Therefore, if the present invention is applied when the particle size of the abrasive grains of the second grinding grindstone is smaller than the particle size of the abrasive grains of the first grinding grindstone, the effects of the present invention can be more appropriately enjoyed.

In the method, the particle size of the abrasive grains of the second grinding grindstone may be 0.1 to 0.9 times that of the abrasive grains of the first grinding grindstone.

If set in this way, the effects of the present invention can be enjoyed more appropriately.

In addition, the present invention, which was pioneered 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 grinding stone for grinding the ground end surface of the plate glass. Among them: as the grinding grindstone, there are a first grinding grinding stone for grinding the end surface of the plate glass in a state that has been pressed by the first pressing force, and a first grinding grinding stone for grinding the end surface of the plate glass while being pressed by the second pressing force. The grindstone is a second grindstone for grinding the end surface of the plate glass, and the second pressing force is greater 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, idling of the second grinding stone can be suppressed as much as possible, thereby improving the quality of the end surface.

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, 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 taken 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. The grinding grindstone 2, the first grinding grindstone 3, and the second grinding grindstone 4 move in a synchronized manner in the T direction parallel to the X direction, and are fixed to the manufacturing device 1. Processing is performed on the plate glass G on the enclosed platform (not shown). Grooves (not shown) for processing the end surface Ga are formed in multiple layers 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 layer of the multi-layered 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 grindstone 2 is a grindstone for forming the cross-sectional shape of the end surface Ga (the shape of the cross-section orthogonal to the X direction), and processes the end surface Ga 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 big. 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 improving the quality of the end face Ga, the second pressing force F2 is preferably 1.2 times or more of the first pressing force F1, and more preferably 1.5 times or more. In addition, from the viewpoint of preventing excessive polishing by the second grindstone 4, the second pressing force F2 is preferably 7 times or less of the first pressing force F1, more preferably 5 times or less.

The first pressing force F1 is preferably 10N~60N, more preferably 20N~50N. The second pressing force F2 is preferably 12N~420N, more preferably 25N~100N, and most preferably 35N~90N.

The grinding grindstone 2 is preferably a metal bonded 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 stone 3 and the second grinding stone 4 are preferably resin bonded grinding stones using a resin bond as a binding agent 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, it is possible to use diamond particles, alumina particles, silicon carbide particles, cubic boron nitride particles, metal oxide particles, and metal carbides. Particles, metal nitride particles, etc., or a mixture of two or more selected. The particle size of the abrasive grains is preferably #100~#3000, and more preferably #200~#1000.

Here, when the hardness of the abrasive grains of the first grindstone 3 and the hardness of the abrasive grains of the second grindstone 4 are compared, the latter is lower. When the relationship between the hardness of the abrasive grains is to be satisfied, as an example, either diamond particles or cubic boron nitride particles may be used as the abrasive grains of the first grindstone 3, and alumina particles may be used as the abrasive grains. Any one of silicon carbide particles, metal oxide particles, metal carbide particles, and metal nitride particles may be used as the abrasive grains of the second grindstone 4 . as The abrasive grains of the second grindstone 4 may also be a mixture of diamond particles or cubic boron nitride particles and alumina particles, silicon carbide particles, metal oxide particles, metal carbide particles or metal nitride particles. . Furthermore, the hardness of the abrasive grains of the first grindstone 3 may be the same as the hardness of the abrasive grains of the second grindstone 4 . More specifically, the type of abrasive grains of the first grindstone 3 may be the same as the type of abrasive grains of the second grindstone 4 .

The particle size of the abrasive grains of the second grinding grindstone 4 may be the same as the particle size of the abrasive grains of the first grinding grindstone 3 , or may be smaller than the particle size of the abrasive grains of the first grinding grindstone 3 . In the latter case, the particle size of the abrasive grains of the second grindstone 4 may be 0.1 to 0.9 times the particle size of the abrasive grains of the first grindstone 3 .

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

In this method of manufacturing plate glass, first, the plate glass G is carried into a position where a platform is installed using a conveyance mechanism (eg, belt conveyor, etc.) not shown, and then the plate glass G is fixed on 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 surface Ga is formed. In the end surface grinding step, a 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 second grinding step is to grind the end surface Ga of the plate glass G polished with the first grinding grindstone 3 while pressing the second grinding grindstone 4 with the second pressing force F2. 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.

The following describes the main functions of the plate glass manufacturing method and manufacturing device 1. The effect is explained.

According to the manufacturing method and manufacturing device 1 of plate glass, the second pressing force F2 is made larger than the first pressing force F1. Accordingly, in the second grinding step, it is difficult to cause idling between the second grinding stone 4 and the end surface Ga. . In other words, the abrasive grains of the grindstone are appropriately sunk into the end surface, and the end surface can be sufficiently polished. As a result, the quality of the end surface Ga of the plate glass G after the end surface grinding step 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, except for the first grinding stone 3 In addition to the second grinding stone 4, a new grinding stone can also 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 new grinding grindstone may be used to grind the end surface Ga. In addition, after the end surface Ga is polished with the second grindstone 4, the end surface Ga may be polished with a new grindstone.

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 end face 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. 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. In these cases, multiple grinding stones 2 can also be used to perform the end face grinding step.

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

The end face of Ga‧‧‧plate glass

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

T, X, Y, Z‧‧‧ direction

Claims (4)

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 1.2 times to 7 times the size of the first pressing force. times, so that the hardness of the abrasive grains of the second grinding stone is lower than the hardness of the abrasive grains of the first grinding stone. The method for manufacturing plate glass according to claim 1, wherein the particle size of the abrasive grains of the second grinding grindstone is smaller than the particle size of the abrasive grains of the first grinding grindstone. The manufacturing method of plate glass as described in item 2 of the patent application, wherein The particle size of the abrasive grains of the second grinding stone is 0.1 to 0.9 times the particle size of the abrasive grains of the first 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 surface of the plate glass is arranged side by side, and the grinding grindstone is a metal bond grindstone using a metal bond as a binding agent for the abrasive grains. The first grinding grindstone and the second grinding grindstone are The stone is a resin-bonded grindstone using a resin bond as a binder for the abrasive grains. The second pressing force is set to 1.2 times to 7 times the first pressing force, so that the second pressing force is The hardness of the abrasive grains of the second grinding grindstone is lower than the hardness of the abrasive grains of the first grinding grindstone.