TW202325471A - Method for manufacturing glass plate - Google Patents

Abstract

This method for manufacturing a glass plate includes a grinding step P1 for processing an end face a1 of a glass plate 1 with a grinding stone 2, and a polishing step P2 for processing the end face a1 of the glass plate 1, which has been processed with the grinding stone 2, with a polishing stone 3, wherein, in the grinding step P1 and the polishing step P2, between the polishing sections 2a and 3a on the periphery of the grinding stone 2 and the polishing stone 3, at least the processing section 3a of the polishing stone 3 is cooled, and in a comparison between the grinding stone 2 and the polishing stone 3, the cooling effect of the polishing stone 3 is increased.

Description

Manufacturing method of glass plate

The disclosure relates to a method for manufacturing a glass plate.

It is common practice to include a grinding step of processing the end face of the glass plate with a grinding stone and a grinding step of processing the end face processed by the grinding stone with the grinding stone in the manufacturing steps of the glass plate (see Patent Document 1). In the grinding step, the end surface of the glass plate is ground and chamfered, and in the grinding step, finishing processing for smoothing the end surface is performed. [Prior art literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 2016-40073

[Problem to be Solved by the Invention] However, there is a problem that cracks are easily formed on the end surface during the grinding step, resulting in a decrease in the strength of the end surface.

The following (1)-(3) can be mentioned as a reason why a crack is easy to be formed in an end surface during execution of a grinding|polishing process as mentioned above. (1) Compared with grinding stones, grinding stones have finer abrasive grains, so water is less likely to enter between the grinding stones and the end face. (2) The grinding stone must be pressed against the end face more strongly than the grinding stone, and the number of abrasive grains is larger than that of the grinding stone, so the resistance to the rotation of the grinding stone tends to increase. (3) Grinding stones are different from grinding stones. In most cases, a resin binder with a small elastic modulus is used. Due to the sinking of the abrasive grains, the adhesion between the grinding stone and the end surface increases, making it difficult for water to enter.

The technical problem to be solved in view of the above situation is to prevent the strength of the end surface of the glass plate from being lowered as the grinding step is performed during the production of the glass plate. [Means to solve the problem]

A method of manufacturing a glass plate for solving the above-mentioned problems includes: a grinding step of processing the end face of the glass plate with a grinding stone; and a grinding step of processing the end face of the glass plate processed by the grinding stone with the grinding stone Processing, characterized in that: in the grinding step and the grinding step, at least the processed portion of the grinding stone and the processing portion on the circumference of the grinding stone are cooled, and the distance between the grinding stone and the grinding stone is In comparison, the cooling efficiency of the grinding stone is improved.

In this method, in the grinding step and the polishing step, at least the processed portion of the grinding stone is cooled among the processing portions on the circumference of the grinding stone and the grinding stone. Furthermore, comparing the grinding stone and the grinding stone, the cooling efficiency of the grinding stone is improved. In the grinding step, due to the above-mentioned reasons (1) to (3), frictional heat tends to be generated on the grinding stone, so that cracks tend to be formed on the end surface of the glass plate. However, by improving the cooling efficiency of the processed portion of the grinding stone as described above, it is easy to prevent the temperature of the end surface of the glass plate processed by the processed portion from exceeding the allowable range. Therefore, the formation of cracks on the end surface during the grinding step can be avoided as much as possible. As a result, it is possible to prevent the strength of the end face of the glass plate from being reduced as the grinding step is performed.

In the method, preferably, in the grinding step and the grinding step, the cooling medium is supplied to at least the processing portion of the grinding stone among the grinding stone and the processing portion of the grinding stone, and in the grinding step, compared with grinding In terms of steps, increase the supply of cooling medium.

In this way, in the grinding step, the cooling efficiency of the processed portion of the grinding stone can be further improved by increasing the supply amount of the cooling medium compared with the grinding step. Therefore, it becomes more advantageous at the point which prevents the intensity|strength reduction of the end surface of a glass plate.

In the method, it is preferred to use water as the cooling medium.

In this way, by using water as a cooling medium, the effect of preventing the decrease in the strength of the end surface can be enjoyed simply and at low cost.

A method of manufacturing a glass plate for solving the above-mentioned problems includes: a grinding step of processing the end face of the glass plate with a grinding stone; and a grinding step of processing the end face of the glass plate processed by the grinding stone with the grinding stone Processing, characterized in that: in the grinding step and the grinding step, at least the processed portion of the grinding stone and the processing portion on the circumference of the grinding stone are cooled, and the distance between the grinding stone and the grinding stone is In comparison, the temperature of the point of contact with the end surface of the glass plate in the grinding stone was made lower than the temperature of the point of contact with the end surface of the glass plate in the grinding stone.

According to this method, the same operations and effects as those already described for the above-mentioned manufacturing method of the glass plate can be obtained. [Effect of the invention]

According to the manufacturing method of the glass plate of this disclosure, when manufacturing a glass plate, it can prevent that the intensity|strength of the end surface of a glass plate falls along with execution of a grinding|polishing process.

Hereinafter, the manufacturing method of the glass plate which concerns on embodiment is demonstrated, referring drawings and drawings. In addition, the X direction, the Y direction, and the Z direction shown in each drawing referred to in description of embodiment are mutually orthogonal directions.

As shown in Figure 1, the manufacturing method includes: a grinding step P1, using a grinding stone 2 to process the end face 1a of the glass plate 1; and a grinding step P2, using a grinding stone 3 to process the glass plate 1 The end face 1a is machined.

In this embodiment, the grinding process P1 and the grinding|polishing process P2 are performed with respect to both end surfaces 1a, 1a extended along the X direction of the rectangular glass plate 1 which is a horizontally laid posture. However, it is not limited to this, and as a modification of this embodiment, the shape of the glass plate 1 which becomes the object which performs two steps P1, P2 may be good also as a shape other than a rectangle.

The glass plate 1 is formed by a forming method such as a float method, an overflow down-draw method, an orifice down-draw method, or a re-draw method, and then cut into a predetermined size. Both end surfaces 1a, 1a of the glass plate 1 are cut surfaces. The thickness of the glass plate 1 is, for example, 0.1 mm to 10 mm. The glass plate 1 is glass used as a substrate for a display typified by a liquid crystal display or an organic electroluminescence (EL, Electroluminescence) display. Of course, the glass plate 1 may be glass used for solar cells or various lightings, for example, in addition to glass for displays.

In this embodiment, in order to process both end surfaces 1a and 1a of the glass plate 1, the grinding stone 2 and the grinding stone 3 are respectively arrange|positioned as a pair with the glass plate 1 interposed in the Y direction. The pair of grinding stones 2 and grinding stones 3 move in the T direction parallel to the X direction with respect to the glass plate 1 in a state fixed on the platen (not shown), and while moving in the T direction parallel to the X direction, the two end surfaces 1a, 1a for processing. However, it is not limited to this, as long as the two grindstones 2, 3 and the glass plate 1 are relatively moved, it is also possible to set the two grindstones 2, 3 in a fixed state and make the glass plate 1 opposite to this embodiment. 1 moves, whereby two steps P1, P2 are performed. In addition, the two steps P1 and P2 may be performed while moving both the grindstones 2 and 3 and the glass plate 1 . The rotation directions of both grindstones 2 and 3 are counterclockwise when viewed from the Z direction. Of course, the rotation direction of the two grindstones 2, 3 can also be clockwise.

The grinding stone 2 is a grindstone for cutting and chamfering the end surface 1a of the glass plate 1, and processes the end surface 1a in a state where the position in the Y direction is fixed. On the other hand, the grinding stone 3 is a grindstone for smoothing the end surface 1a, and processes the end surface 1a while being pressed against the end surface 1a with a constant pressing force. In addition, as a modified example of this embodiment, the grinding stone 2 may process the end surface 1a in a state of being pressed against the end surface 1a with a constant pressing force. The "pressing force" mentioned here is a force acting parallel to the Y direction, and the unit is [N].

The grinding stone 2 is preferably a metal bond grindstone using a metal bond material (metal bond) as a bond material (bond) of abrasive grains. The metal used as the bonding material is preferably one selected from iron, copper, cobalt, nickel, tungsten, or two or more selected and mixed, and is particularly preferably a metal containing iron. The abrasive grains bonded to the grinding stone 2 are preferably diamond abrasive grains, and the grain size is preferably #200-#600.

The grinding stone 3 is preferably a resin bond grinding stone using a resin bond material (resin bond) as a bond material (bond) of abrasive grains. As the resin bond material, a thermosetting resin is preferable. As specific examples, phenolic resins, epoxy resins, polyimide resins, polyurethane resins, etc. can be used as the resin binder. As the abrasive grains bonded to the grinding stone 3, one or two or more of them may be selected from diamond abrasive grains, cubic boron nitride abrasive grains, silicon carbide abrasive grains, alumina abrasive grains, and cerium oxide abrasive grains. A mixture of those. The particle size of the abrasive grains is preferably #400-#3000.

Figure 2a shows the grinding step P1 and Figure 2b shows the grinding step P2. According to the two figures, it can be understood that the grinding step P1 and the grinding step P2 have a common point in the embodiment. Hereinafter, common points between the grinding step P1 and the polishing step P2 will be described.

In the grinding process P1 and the grinding process P2, the water 4 which is a cooling medium is supplied to the processing part 2a and the processing part 3a on the circumference of the grinding stone 2 and the grinding stone 3, respectively. Thereby, the processed part 2a and the processed part 3a of both grindstones 2 and 3 are cooled. In this embodiment, the water 4 supplied to the processing part 2a and the water 4 supplied to the processing part 3a are substantially the same temperature. In the processing part 2a and the processing part 3a of both grindstones 2 and 3, the groove|channel (illustration omitted) for processing the end surface 1a of the glass plate 1 is formed in multiple stages up and down. The end face 1a is processed by pressing one of the multi-stage grooves against the end face 1a. Furthermore, in this embodiment, water 4 is used as the cooling medium, but air, microbubbles, nanobubbles, coolant, etc. may also be used as the cooling medium. Moreover, the temperature of the water 4 supplied to the processing part 2a and the water 4 supplied to the processing part 3a may be different. Specifically, the temperature of the water 4 supplied to the processing part 3a may be made lower than the temperature of the water 4 supplied to the processing part 2a. For example, the temperature of the water 4 supplied to the processing part 3a can be set to 10°C to 20°C, and the temperature of the water 4 supplied to the processing part 2a can be set to 15°C to 25°C. When using air, microbubbles, nanobubbles, coolant, etc. as the cooling medium, their temperatures can also be set to the same temperature as the temperature of the water 4 .

Water 4 is supplied to processing portion 2 a of grinding stone 2 and processing portion 3 a of grinding stone 3 from nozzle 5 for grinding step and nozzle 6 for grinding step, respectively (both nozzles 5 and 6 are omitted in FIG. 1 ). The nozzle 5 for a grinding process and the nozzle 6 for a grinding process include the 1st nozzle 7, the 1st nozzle 8, the 2nd nozzle 9, and the 2nd nozzle 10, respectively. In addition, the nozzle 5 for a grinding process, and the nozzle 6 for a grinding process move to the X direction in conjunction with the movement of the grinding stone 2 and the grinding stone 3, respectively.

The first nozzle 7 and the first nozzle 8 are arranged to align with the glass plate 1 in the vertical direction (Z direction), and point to the grinding point 2x and the grinding point 3x from the rear side of the rotation direction of the two grinding stones 2 and 3. supply water4. The grinding point 2x is a part (contact point) where the processed portion 2a of the grinding stone 2 is in contact with the end surface 1a of the glass plate 1 to process the end surface 1a, and the grinding point 3x is a portion (contact point) where the processing portion 3a of the grinding stone 3 contacts the end surface 1a. The part (contact point) where the end face 1a is processed. In addition, as a modified example of the present embodiment, the water 4 may be supplied from the front side in the rotation direction of both the grindstones 2 and 3 . The water 4 from the first nozzle 7 and the first nozzle 8 is supplied for the purpose of reducing friction between the two grinding stones 2, 3 and the end surface 1a, or preventing overheating of the two grinding stones 2, 3 and the end surface 1a due to friction. .

The second nozzle 9 and the second nozzle 10 are disposed so as to face the grinding stone 2 and the grinding stone 3 in the Y direction. The second nozzle 9 and the second nozzle 10 supply the water 4 in shower form from the side of the glass plate 1 toward the side of the grinding stone 2 and the side of the grinding stone 3 . The water 4 from the second nozzle 9 and the second nozzle 10 is for the purpose of removing the glass powder generated in the grinding step P1 and the grinding step P2 from the glass plate 1, the grinding stone 2, and the grinding stone 3, etc. And supply. Furthermore, the nozzle 5 for the grinding step and the nozzle 6 for the polishing step do not necessarily include the second nozzle 9 and the second nozzle 10 , and may include only the first nozzle 7 and the first nozzle 8 .

Hereinafter, differences between the grinding step P1 and the polishing step P2 will be described.

In the grinding step P2, the supply amount of the water 4 is increased compared to the grinding step P1. That is, the flow rate of the water 4 flowing out from the nozzle 6 (the first nozzle 8 and the second nozzle 10) in the grinding step is more than that of the water 4 flowing out from the nozzle 5 (the first nozzle 7 and the second nozzle 9) in the grinding step. flow. Specifically, the flow rate of the water 4 flowing out from the first nozzle 8 is made larger than that of the first nozzle 7 , and the flow rate of the water 4 flowing out from the second nozzle 10 is made larger than that of the second nozzle 9 . However, it is not limited to this, as long as the flow rate of the water 4 flowing out from the nozzle 6 in the grinding step is greater than the flow rate of the water 4 flowing out from the nozzle 5 in the grinding step, the flow rate between the first nozzle 7 and the first nozzle 8 The relation and the magnitude relation of the flow rate between the second nozzle 9 and the second nozzle 10 may be arbitrary.

Here, the flow rate of the water 4 flowing out from the nozzle 5 for the grinding step is used as a reference, and the flow rate of the water 4 flowing out from the nozzle 6 for the grinding step is preferably set at a flow rate of 105% or more. Furthermore, it is more preferable to set it as a flow rate of 110% or more, and it is more preferable to set it as a flow rate of 120% or more. In this embodiment, in the grinding step P1, the flow rate of water flowing out from the nozzle 5 for the grinding step is set to 10 L/min to 20 L/min. On the other hand, in the polishing step P2, the flow rate of water flowing out from the nozzle 6 for the polishing step is set at 12 L/min to 30 L/min.

In this manufacturing method, the cooling efficiency of the processing portion 3a of the grinding stone 3 is improved in comparison with the processing portion 2a of the grinding stone 2 and the processing portion 3a of the grinding stone 3 based on the flow rate relationship of the water 4. . Accordingly, the temperature of the grinding point 3x in the grinding step P2 becomes lower than the temperature of the grinding point 2x in the grinding step P1. Therefore, it is easy to prevent the temperature of the end surface 1a of the glass plate 1 processed by the processing part 3a from becoming higher than the allowable range. Therefore, the formation of cracks on the end surface 1 a during the grinding step P2 can be avoided as much as possible. As a result, it is possible to prevent a decrease in the strength of the end surface 1a of the glass sheet 1 accompanying the execution of the grinding step P2.

Here, the following modified examples can also be applied to the above-described embodiment. In the above embodiment, in order to achieve the purpose of improving the cooling efficiency of the processing portion 3a of the grinding stone 3 in comparison with the processing portion 2a of the grinding stone 2 and the processing portion 3a of the grinding stone 3, in the grinding step P2 , increase the supply of water 4 compared to the grinding step P1. However, it is not limited thereto, and when the above object is achieved, the water 4 having a lower temperature than the grinding step P1 may be supplied in the grinding step P2. Moreover, the water 4 may be supplied only to the processing part 3a of the grinding stone 3 among the grinding stone 2 and the grinding stone 3.

1: glass plate 1a: end face 2: grinding stone 2a: Processing Department 2x: Grinding point (contact point) 3: grinding stone 3a: Processing Department 3x: Grinding point (contact point) 4: water 5: Nozzle for grinding step 6: Nozzle for grinding step 7, 8: the first nozzle 9, 10: Second nozzle P1: Grinding step P2: Grinding step T: Direction X: direction Y: Direction Z: Direction

FIG. 1 is a plan view schematically showing a grinding step and a polishing step included in a method of manufacturing a glass plate. Fig. 2a is a plan view showing a grinding step included in the method of manufacturing a glass plate. Fig. 2b is a plan view showing a grinding step included in the manufacturing method of the glass plate.

1: glass plate

1a: end face

3: grinding stone

3a: Processing Department

3x: Grinding point (contact point)

4: water

6: Nozzle for grinding step

8: The first nozzle

10: Second nozzle

P2: Grinding step

X: direction

Y: Direction

Z: Direction

Claims (4)

A method for manufacturing a glass plate, comprising: a grinding step of processing an end surface of a glass plate with a grinding stone; and a grinding step of grinding an end surface of the glass plate processed by the grinding stone with a grinding stone. Processing, the manufacturing method of the glass sheet is characterized in that: In the grinding step and the grinding step, cooling at least the processed portion of the grinding stone among the processing portion on the circumference of the grinding stone and the grinding stone, In the comparison between the grinding stone and the grinding stone, the cooling efficiency of the grinding stone is improved. The method for manufacturing a glass plate according to claim 1, wherein in the grinding step and the grinding step, at least the grinding stone in the processing portion of the grinding stone and the grinding stone is The processing part of the stone is supplied with cooling medium, In the grinding step, the supply amount of the cooling medium is increased compared to the grinding step. The method for manufacturing a glass plate according to Claim 2, which uses water as the cooling medium. A method for manufacturing a glass plate, comprising: a grinding step of processing an end surface of a glass plate with a grinding stone; and a grinding step of grinding an end surface of the glass plate processed by the grinding stone with a grinding stone. Processing, the manufacturing method of the glass sheet is characterized in that: In the grinding step and the grinding step, cooling at least the processed portion of the grinding stone among the processing portion on the circumference of the grinding stone and the grinding stone, In the comparison between the grinding stone and the grinding stone, the temperature of the contact point of the grinding stone with the end surface of the glass plate is lower than that of the grinding stone and the end surface of the glass plate. temperature of the contact point.

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