TW202328022A - Glass sheet manufacturing method - Google Patents

Abstract

Provided is a glass sheet manufacturing method comprising: a grinding step P1 for processing an end face 1a of a glass sheet 1 with a grinding wheel 2; and a polishing step P2 for processing the end face 1a of the glass sheet 1 with a polishing wheel 3 after the processing with the grinding wheel 2, wherein the processing in the griding step P1 is performed in a brittle mode, and the processing in the polishing step P2 is performed mainly in a ductile mode.

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] A glass plate is used as a substrate for displays represented by liquid crystal displays, organic electroluminescence (EL) displays, and the like. In recent years, the development of higher-definition displays has been demanded, and in order to meet this demand, it is necessary to further improve the quality of the end surface of the glass plate. Specifically, low dust generation that can further suppress the generation of glass powder, chemical resistance that can prevent corrosion caused by etching liquid, high strength that can prevent cracks starting from the end surface, and the like are required.

The technical problem to be solved in view of the above situation is to improve the quality of the end surface of the glass plate at the time of manufacturing the glass plate. [Means to solve the problem]

A method of manufacturing a first glass plate for solving the above-mentioned problems includes: a grinding step of processing an end surface of a glass plate with a grinding stone; and a grinding step of grinding the glass plate processed by the grinding stone with a grinding stone The method is characterized in that the processing is performed in a brittle mode in the grinding step, and the processing is mainly performed in a ductile mode in the grinding step.

Here, "processing mainly in the ductile mode" means that 50% or more of the total length (full length along the machining direction) of the end surface to be processed is processed in the ductile mode (the same applies hereinafter).

In this method, in the step of finishing the end surface of the glass plate, that is, the grinding step, the end surface is mainly processed in a ductile mode. According to the ductility mode, remaining cracks on the machined end face can be avoided as much as possible. Thereby, for the end face after the grinding step, low dust generation that suppresses the generation of glass powder, chemical resistance that prevents corrosion caused by etching liquid, and high strength that prevents cracks starting from the end face are obtained. That is, the end surface quality of a glass plate can be improved.

The manufacturing method of the 2nd glass plate is set as follows: In the manufacturing method of the said 1st glass plate, in a grinding process and a grinding process, a cooling medium is supplied to the grinding stone and the processing part on the circumference of a grinding stone, respectively. , in the grinding step, the supply amount of the cooling medium is reduced compared to the grinding step.

As a result of the inventor's experiments, it has been found that when the cooling medium is supplied to the processing portion on the circumference of the grindstone, if the supply amount is reduced in the grinding step compared with the grinding step, ductility is easily expressed in the grinding step model. Therefore, if the supply amount of the cooling medium is reduced as described above, it is easy to stably perform processing in the ductility mode in the grinding step.

The manufacturing method of the 3rd glass plate is set as the aspect which uses water as a cooling medium in the manufacturing method of the said 2nd glass plate. In addition, in the manufacturing method of the fourth glass plate, in the manufacturing method of the third glass plate, in the grinding step and the grinding step, water is supplied from the nozzle for the grinding step and the nozzle for the grinding step, respectively, and in the grinding step , set the flow rate of water flowing out from the nozzle in the grinding step to 15 L/min to 25 L/min, and in the grinding step, set the flow rate of water flowing out from the nozzle in the grinding step to 0 L/min to 15 L/min min.

According to the manufacturing method of the third glass plate, by using water as the cooling medium, the effect of improving the quality of the end surface of the glass plate can be enjoyed easily and at low cost. Moreover, according to the manufacturing method of the said 4th glass plate, by adjusting the flow rate of water to the said flow rate, it becomes easy to express a ductility mode in a grinding process, and it is more advantageous in this point.

The manufacturing method of the 5th glass plate is set as follows: In the manufacturing method of any one glass plate in the manufacturing method of the said 1st glass plate - the manufacturing method of the 4th glass plate, in a grinding process, a grinding stone is used The relative moving speed with the end face of the glass plate is set to 20 m/min or more.

As a difficulty in the processing by the ductility mode, the relative moving speed (processing speed) of the grindstone and the end surface of the glass plate tends to be low. However, if the amount of cooling medium (water) supplied in the grinding step is reduced compared to the grinding step as described above, processing by the ductility mode at a high relative moving speed of 20 m/min or more can be realized .

The manufacturing method of the 6th glass plate is set as follows: In the manufacturing method of any one glass plate in the manufacturing method of the said 1st glass plate - the manufacturing method of the 5th glass plate, in a grinding|polishing process, the following [Equation 1] The value of G calculated by the formula is less than 0.1. [number 1] m: the number of types of abrasive grains contained in the grindstone n _k : the number of abrasive grains for the k-th type of abrasive grains (calculated from the following formula 2) r _k : average for the k-th type of abrasive grains Abrasive grain radius [mm] A _k : Abrasive grain type coefficient regarding the k-th type of abrasive grain D: Diameter of the grinding stone [mm] B: Binder coefficient regarding the binder used for the grinding stone Here, the abrasive grain type coefficient The value of A _k is set as follows according to the type of abrasive grains. Diamond: 8000 Cubic boron nitride: 4700 Silicon carbide: 2500 Alumina: 2100 Here, the value of the binder coefficient B is set as follows according to the type of binder. Metal: 3000 Resin: 30 Elastomer: 1 [number 2] c _k : Abrasive grain ratio of the kth abrasive grain [vol%]

If the value of G calculated from the above-mentioned [Expression 1] formula is less than 0.1, the above-mentioned effect of improving the quality of the end surface of the glass plate can be enjoyed more suitably.

Here, the above formula [1] will be described. The value of G is an index for showing the level of the ability of the grindstone to grind the end surface of the glass plate. When the above-mentioned [Expression 1] expression is expanded, it becomes the following [Expression 3] expression. [number 3]

Regarding the above formula [3], "n ₁ +n ₂ +···+n _m " as a denominator represents the number of all abrasive grains contained in the grindstone. The larger the value of "n ₁ +n ₂ +...+n _m ", the larger the contact area, and the smaller the force exerted by each abrasive grain on the end surface of the glass plate, the lower the ability of the grindstone to grind the end surface .

This coefficient of "2/3" as a numerator is based on the fact that the amount of the abrasive grains contained in the grindstone protruding from the binder is generally referred to as 1/3 of the diameter of the abrasive grains.

“A _k (k=1, 2, . . . , m)” as a numerator is a coefficient set based on the Knoop hardness of abrasive grains used in a grindstone. "r _k A _k (k=1, 2, ..., m)" as a numerator is a coefficient that takes into account the fact that the larger the particle size of the abrasive grain, the greater the removal amount of the end surface of the glass plate. The harder the grains, the more they can be removed without damaging the workpiece (glass).

"n _k /n ₁ +n ₂ +···+n _m (k=1, 2,···,m)" as a numerator represents the k-th abrasive grain among all the abrasive grains contained in the grinding stone proportion.

"√D" as the denominator is a coefficient that takes into account the influence of the diameter of the grindstone. The larger the diameter, the longer the length of contact between the grindstone and the end surface of the glass plate during grinding, and the number of abrasive grains that touch the end surface at the same time increases. , so the ability of the grindstone to grind the end face becomes low.

"B" which is a numerator is a coefficient which takes into account the influence of the elastic modulus of a binder with respect to the binder used for a grindstone. The smaller the value of "B", the lower the abrasive grains sink, and the easier the alignment of the protruding amount of each abrasive grain from the adhesive is, and the force exerted by each abrasive grain on the end surface of the glass plate becomes smaller, so the end surface is ground by the grindstone. Ability becomes lower.

In the manufacturing method of the seventh glass plate, in the manufacturing method of the sixth glass plate, in the grinding step, the value of G calculated from the formula [1] and the value of G calculated from the following formula [4] The product of the values of P calculated by the formula satisfies the relationship of 1.0×10 ^-9 ≦G×P≦1.0×10 ^-6 . [number 4] v: Relative moving speed (processing speed) of the grinding stone and the end face of the glass plate [m/min] V: Peripheral speed of the grinding stone [m/min] L: Flow rate of water supplied to the grinding stone [L/min] F : Extrusion force of the grinding stone on the end face of the glass plate [N]

If the value of G×P satisfies the above relationship, it is more favorable for the ductility mode to be easily expressed in the polishing step, and it is more suitable for improving the quality of the end surface of the glass plate.

The manufacturing method of the eighth glass plate is set as follows: In the manufacturing method of any one glass plate in the manufacturing method of the said 1st glass plate - the manufacturing method of the 7th glass plate, the temperature of the grinding|polishing point in a grinding|polishing process is made It is high temperature compared with the temperature of the grinding point in a grinding process.

As a result of experiments conducted by the inventors, it was found that if the temperature of the grinding point in the grinding step is made higher than the temperature of the grinding point in the grinding step, the ductility mode is likely to appear in the grinding step. Therefore, if the grinding point is made higher temperature than the grinding point as described above, it is easy to perform the processing by the ductility mode stably in the polishing step.

A ninth method of manufacturing a glass plate for solving the above-mentioned problems includes: a grinding step of processing an end face of a glass plate with a grinding stone; and a grinding step of grinding the glass plate processed by the grinding stone with a grinding stone The method is characterized in that in the grinding step and the grinding step, a cooling medium is supplied to the grinding stone and the processing portion on the circumference of the grinding stone, respectively, and in the grinding step, compared with the grinding step Decrease the supply of cooling medium.

In this method, since the cooling medium is supplied to the processing portion on the circumference of the grindstone, the supply amount is reduced in the grinding step compared to the grinding step, so that the processing efficiency (processing speed) is not lowered even in the grinding step. , are also prone to exhibit ductility patterns. With the ductility mode, it is possible to avoid residual cracks on the end face after processing as much as possible. Thereby, for the end face after the grinding step, low dust generation that suppresses the generation of glass powder, chemical resistance that prevents corrosion caused by an etching solution, and high strength that prevents cracks starting from the end face are obtained. That is, the end surface quality of a glass plate can be improved. [Effect of the invention]

By the manufacturing method of the glass plate of this disclosure, when manufacturing a glass plate, the quality of the end surface of this glass plate can be improved.

Hereinafter, the manufacturing method of the glass plate which concerns on embodiment is demonstrated with reference to accompanying drawing. 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 manufacturing method, the end face 1a is processed in a brittle mode in the grinding step P1, and the end face 1a is processed mainly in a ductile mode in the grinding step P2.

Here, the ductile mode and the brittle mode will be described.

When grinding (polishing) is performed on glass with a grindstone, the processed surface (the end surface 1 a in this embodiment) becomes transparent or opaque. The processed surface becomes transparent in ductile mode, and opaque in brittle mode.

As shown in FIG. 2 , during the period when the pressure of the grinding stone against the glass is sufficiently small, the glass slides up along the surface of the grinding stone. However, if the pressure becomes great enough, the glass is ground (ground) by the grindstone. It is the ductile mode that performs processing under a pressure higher than the grinding start pressure at the start of the grinding (grinding).

For example, whether it is a brittle mode or a ductile mode can be judged as follows. First, the arithmetic mean height Sa of the end surface of the glass plate 1 is measured. The arithmetic mean height Sa can be measured, for example with a microscope VHX-8000 manufactured by Keyence Corporation. If Sa is 0.20 μm or more, it is a brittle mode, and if Sa is less than 0.20 μm, it is a ductile mode.

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, a slot 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 represented by a liquid crystal display, an organic EL display, or the like. 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 the both end surfaces 1a and 1a of the glass plate 1, the grinding stone 2 and the grinding stone 3 are arrange|positioned so that they may be paired with the glass plate 1 in the Y direction, respectively. 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 contrary to the present embodiment, and to make the glass plate 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 grinding the end surface 1 a of the glass plate 1 to perform chamfering. 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. Furthermore, as a modified example of the present 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].

In the present embodiment, a grindstone having a G value of 0.1 or more calculated by the formula [1] is used as the grinding stone 2 , and a grindstone having a G value of less than 0.1 is used as the grinding stone 3 . However, the value of G is preferably set to 1.0×10 ⁻⁵ or more in order to avoid an excessively insufficient ability to grind the end surface 1 a of the glass plate 1 in the grinding stone 3 .

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. However, regarding the type of bonding agent in the grinding stone 2, the type of abrasive grains, and the particle size of the abrasive grains, as long as the value of G in the above formula [1] is 0.1 or more, any bonding agent may be used. , abrasive grain, particle size.

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 selected from diamond abrasive grains, cubic boron nitride abrasive grains, silicon carbide abrasive grains, and alumina abrasive grains, or two or more of them selected and mixed can be used. The particle size of the abrasive grains is preferably #320-#1000. However, regarding the type of bonding agent in the grinding stone 3, the type of abrasive grains, and the particle size of the abrasive grains, any bonding agent, Abrasive grain, particle size. In addition, the grinding stone 3 may be a different type of grinding stone from the grinding stone 2, or may be the same type of grinding stone.

Figure 3a shows the grinding step P1 and Figure 3b 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. 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.

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 portion where the processed portion 2a of the grinding stone 2 contacts the end surface 1a of the glass plate 1 to process the end surface 1a, and the grinding point 3x is the portion where the processing portion 3a of the grinding stone 3 contacts the end surface 1a to process the end surface 1a. processed parts. 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 reduced 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) of the grinding step (corresponding to L in the formula [4]) is less than that of the nozzle 5 (the first nozzle 10) flowing out from the grinding step. The flow rate of the water 4 flowing out of the first nozzle 7 and the second nozzle 9). Specifically, the flow rate of the water 4 flowing out from the first nozzle 8 is made smaller than that of the first nozzle 7 , and the flow rate of the water 4 flowing out from the second nozzle 10 is made smaller 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 less than the flow rate of the water 4 flowing out from the nozzle 5 in the grinding step, the size of 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 taken as a reference, and the flow rate of the water 4 flowing out from the nozzle 6 for the grinding step is preferably 75% or less of the flow rate. Furthermore, it is more preferable to set it as a flow rate of 50% or less, and it is more preferable to set it as a flow rate of 25% or less. 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 15 L/min to 25 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 0 L/min to 15 L/min. That is, in the grinding|polishing process P2, the water 4 may not necessarily be supplied to the processing part 3a of the grinding stone 3. When the water 4 is not supplied in the polishing step P2, the nozzle 6 for the polishing step may not be provided.

In this manufacturing method, the temperature of the polishing point 3x in the polishing step P2 is made higher than the temperature of the polishing point 2x in the grinding step P1 according to the flow rate relationship of the water 4 described above. In addition, due to the flow rate relationship of the water 4, the ductility mode is easily expressed in the polishing step P2, and the processing of the end surface 1a of the glass sheet 1 based on the ductility mode is easily performed stably. Furthermore, in this production method, compared with the case where the supply amount of water 4 is equalized between the grinding step P1 and the grinding step P2, even if coarse abrasive grains are used as the grinding stone 3, it is easy to express Extensibility mode. Furthermore, since coarse abrasive grains can be used, it is also possible to achieve a longer life of the grinding stone 3, a reduction in uneven grinding, an increase in processing speed, and the like.

Hereinafter, the implementation conditions of the polishing step P2 other than the above-mentioned matters will be described.

In the polishing step P2, the relative moving speed (processing speed) of the grinding stone 3 and the end surface 1a of the glass plate 1 is set to 20 m/min or more. Furthermore, the relative moving speed is preferably at least 25 m/min, more preferably at least 30 m/min. In this embodiment, since the grinding stone 3 processes the end face 1a while moving relative to the fixed glass plate 1, the relative moving speed is equal to the moving speed v of the grinding stone 3 shown in FIG. 3b.

In addition, in the grinding step P2, the peripheral speed of the grinding stone 3 is V, and the flow rate of the water 4 supplied to the grinding stone 3 (in this embodiment, the flow rate of the water 4 flowing out from the nozzle 6 for the grinding step The flow rate is equal) as L, and the pressing force of the grinding stone 3 pressing the end surface 1a as F, and the value of P is calculated according to the above-mentioned [Equation 4]. Furthermore, the product (G×P) of the value of P and the value of G calculated from the above formula [1] satisfies the relationship of 1.0×10 ⁻⁹ ≦G×P≦1.0×10 ⁻⁶ . Furthermore, the value of G×P is more preferably satisfying the relationship of 5.0×10 ^-8 ≦G×P≦1.0×10 ^-6 , further preferably satisfying 3.0×10 ^-7 ≦G×P≦1.0×10 ^-6 relation.

Here, the following modified examples can also be applied to the above-mentioned embodiment. In the above embodiment, only one grinding stone 2 and one grinding stone 3 are used in grinding process P1 and grinding process P2, respectively, but a plurality of grinding stones 2 and grinding stone 3 may be used. In this case, the end surface 1 a of the glass plate 1 is processed in a brittle mode by each grinding stone 2 , and the end surface 1 a is processed mainly in a ductile mode by each grinding stone 3 . At this time, it is preferable to reduce the amount of water 4 supplied to each grinding stone 3 compared to the amount of water 4 supplied to each grinding stone 2 . [Example]

After the end surface of the glass plate was processed in the brittle mode with the grinding stone as the grinding step, the case where (a) the brittle mode was processed with the grinding stone as the grinding step (comparative example) and (b) mainly with the ductility The quality of the end face after processing was compared between cases (Example) in which the end face was processed by the property model. Furthermore, in the comparative example, the flow rate of water supplied to the grindstone in the grinding step was equal to the flow rate of water supplied to the grindstone in the grinding step, and in the examples, the flow rate of water supplied to the grindstone in the grinding step The flow rate is set to be smaller than the flow rate of water supplied to the grindstone in the grinding step.

In Comparative Example 1, Example 1, and Example 2, the grinding stones of the conditions listed below were used in common. Type of abrasive grain: diamond (abrasive grain type coefficient A ₁ =8000) grain size of abrasive grain: #1500 (average abrasive grain radius r ₁ =0.005[mm]) abrasive grain rate c ₁ : 25[vol%] of grinding stone Diameter D: 200[mm] Type of adhesive: phenolic resin (resin adhesive, adhesive coefficient B=30)

In Comparative Example 1, Example 1, and Example 2, the processing conditions were each set to the conditions listed below. [Comparative Example 1] Relative moving speed v (processing speed) of the grinding stone and the end face of the glass plate: 30 [m/min] Peripheral speed V of the grinding stone: 2000 [m/min] The speed at which the grinding stone presses the end face of the glass plate Pressing force F: 20 [N] Flow rate L of water supplied to the grindstone: 15 [L/min] Value of G×P: 1.33×10 ⁻⁶ [Example 1] The relative distance between the grindstone and the end surface of the glass plate Moving speed v (processing speed): 10[m/min] Peripheral speed V of the grindstone: 2000[m/min] Pressing force F of the grindstone against the end face of the glass plate: 20[N] Flow rate L of water: 15 [L/min] Value of G×P: 4.44×10 ⁻⁷ In addition, the flow rate of water supplied to the grinding stone is 25 L/min. [Example 2] The relative moving speed v (processing speed) of the grinding stone and the end surface of the glass plate: 30 [m/min] The peripheral speed V of the grinding stone: 2000 [m/min] The speed of the grinding stone pressing the end surface of the glass plate Squeeze force F: 20 [N] Flow rate L of water supplied to the grinding stone: 5 [L/min] G×P value: 4.44×10 ^-7 Furthermore, the flow rate of water supplied to the grinding stone is 25 L/min.

Unlike Comparative Example 1, in Example 1 and Example 2, high end surface quality (low dust generation, chemical liquid resistance, high strength) was obtained. In addition, in Example 2, although the processing speed was the same as that of Comparative Example 1, high end surface quality was also obtained. The reason for this is presumed to be that, in Example 2, the flow rate of water supplied to the grindstone in the grinding step is less than that of the water supplied to the grindstone in the grinding step, compared to Comparative Example 1. The flow of water L.

In Comparative Example 2, Example 3, and Example 4, the grinding stones of the conditions listed below were used in common. Type of abrasive grain (first type): diamond (abrasive grain type coefficient A ₁ =8000) abrasive grain size (first type): #600 (average abrasive grain radius r ₁ =0.0125[mm]) abrasive grain rate ( Type 1) c ₁ : 15[vol%] Type of abrasive grain (Type 2): silicon carbide (coefficient of type of abrasive grain A ₂ =2500) Size of grain (Type 2): #400 (average abrasive grain Radius r ₂ =0.01875[mm]) Abrasive grain ratio (second type) c ₂ : 15[vol%] Diameter D of the grinding stone: 200[mm] Type of binder: urethane rubber (elastomer, Adhesive coefficient B=1)

In Comparative Example 2, Example 3, and Example 4, the processing conditions were set to the conditions listed below, respectively. [Comparative Example 2] Relative moving speed v (processing speed) of the grinding stone and the end face of the glass plate: 30 [m/min] Peripheral speed V of the grinding stone: 2000 [m/min] The speed at which the grinding stone presses the end face of the glass plate Pressing force F: 30 [N] Flow rate L of water supplied to the grindstone: 15 [L/min] Value of G×P: 1.31×10 ⁻⁶ [Example 3] The relative distance between the grindstone and the end surface of the glass plate Moving speed v (processing speed): 3 [m/min] Peripheral speed V of the grindstone: 2000 [m/min] Pressing force F of the grindstone against the end face of the glass plate: 30 [N] Flow rate L of water: 15 [L/min] Value of G×P: 1.31×10 ⁻⁷ In addition, the flow rate of water supplied to the grinding stone is 25 L/min. [Example 4] The relative moving speed v (processing speed) of the grinding stone and the end surface of the glass plate: 30 [m/min] The peripheral speed V of the grinding stone: 2000 [m/min] The speed of the grinding stone pressing the end surface of the glass plate Squeeze force F: 30 [N] Flow rate L of water supplied to the grinding stone: 2 [L/min] G×P value: 1.74×10 ⁻⁷ Furthermore, the flow rate of water supplied to the grinding stone is 25 L/min.

Unlike Comparative Example 2, high end surface quality was obtained in Examples 3 and 4. In addition, in Example 4, although the processing speed was the same as that of Comparative Example 2, high end surface quality was also obtained. The reason for this is presumed to be that, in Example 4, the flow rate of water supplied to the grindstone in the grinding step is less than that of water supplied to the grindstone in the grinding step. The flow of water L. Furthermore, from the results of Example 3 and Example 4, it can be seen that in Example 4 in which the flow rate L of water is relatively small, compared with Example 3 in which the flow rate L of water is relatively large, high-speed processing can be realized.

In Comparative Example 3 and Example 5, the grinding stones of the conditions listed below were used together. Abrasive grain type: silicon carbide (abrasive grain type coefficient A ₁ =2500) abrasive grain size: #400 (average abrasive grain radius r ₁ =0.01875[mm]) abrasive grain ratio c ₁ : 50[vol%] grinding stone Diameter D: 200[mm] Type of adhesive: elastomer (adhesive coefficient B=1)

In Comparative Example 3 and Example 5, the processing conditions were respectively set to the conditions listed below. [Comparative Example 3] Relative moving speed v (processing speed) of the grinding stone and the end face of the glass plate: 30 [m/min] Peripheral speed V of the grinding stone: 2000 [m/min] The speed at which the grinding stone presses the end face of the glass plate Pressing force F: 15 [N] Flow rate L of water supplied to the grindstone: 15 [L/min] Value of G×P: 1.83×10 ⁻⁶ [Example 5] The relative distance between the grindstone and the end surface of the glass plate Moving speed v (processing speed): 30 [m/min] Peripheral speed V of the grindstone: 2000 [m/min] Pressing force F of the grindstone against the end surface of the glass plate: 15 [N] Flow rate L of water: 4 [L/min] Value of G×P: 4.88×10 ⁻⁷ In addition, the flow rate of water supplied to the grinding stone was 25 L/min.

Unlike Comparative Example 3, high end surface quality was obtained in Example 5. Here, for Comparative Example 3 and Example 5, states in which the processed end faces were etched are shown in FIGS. 4 and 5 , respectively. According to the two figures, it can be seen that compared with Comparative Example 3, Example 5 can prevent the corrosion of the end surface. In addition, in Example 5, although the processing speed was the same as that of Comparative Example 3, high end surface quality was also obtained. The reason for this is presumed to be that, in Example 5, the flow rate of water supplied to the grindstone in the grinding step is less than that of the water supplied to the grindstone in the grinding step, compared to Comparative Example 3. The flow of water L.

1: glass plate 1a: end face 2: Grinding grindstone (grindstone) 2a: Processing Department 2x: Grinding points 3: Grinding millstone (grindstone) 3a: Processing Department 3x: Grinding point 4: water 5: Nozzle for grinding step (nozzle) 6: Nozzle for grinding step (nozzle) 7, 8: the first nozzle 9, 10: Second nozzle D: diameter F: extrusion force P1: Grinding step (step) P2: Grinding step (step) T, X, Y, Z: direction v: moving speed (relative moving speed) V: peripheral speed

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. 2 is a diagram for explaining a ductile mode and a brittle mode. Fig. 3a is a plan view showing a grinding step included in the method of manufacturing a glass plate. Fig. 3b is a plan view showing a grinding step included in the manufacturing method of the glass plate. FIG. 4 is a diagram showing a state in which an end face is etched in Comparative Example 3. FIG. FIG. 5 is a view showing a state in which end faces are etched in Example 5. FIG.

1: glass plate

1a: end face

3: grinding millstone (grindstone)

3a: Processing Department

3x: Grinding point

4: water

6: Nozzle (nozzle) for grinding step

8: The first nozzle

10: Second nozzle

D: diameter

F: extrusion force

P2: Grinding step (step)

v: moving speed (relative moving speed)

V: peripheral speed

X, Y, Z: direction

Claims (9)

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: processing in a brittle mode during said grinding step, During the grinding step the processing takes place mainly in ductile mode. The method for manufacturing a glass plate according to claim 1, wherein, in the grinding step and the grinding step, a cooling medium is supplied to the grinding stone and the processing portion on the circumference of the grinding stone, respectively, In the grinding step, the supply amount of the cooling medium is reduced compared to the grinding step. The method of manufacturing a glass plate according to claim 2, wherein water is used as the cooling medium. The manufacturing method of the glass plate as claimed in item 3, wherein, In the grinding step and the grinding step, water is supplied from the nozzle for the grinding step and the nozzle for the grinding step, respectively, In the grinding step, the flow rate of the water flowing out from the nozzle in the grinding step is set to 15 L/min to 25 L/min, In the grinding step, the flow rate of water flowing out from the nozzle for the grinding step is 0 L/min to 15 L/min. The method of manufacturing a glass plate according to claim 3 or 4, wherein in the grinding step, the relative moving speed of the grinding stone and the end surface of the glass plate is set to 20 m/min or more. The method for manufacturing a glass plate according to claim 3 or 4, wherein, in the grinding step, the value of G calculated according to the following formula [1] is less than 0.1, m: the number of types of abrasive grains contained in the grindstone n _k : the number of abrasive grains for the k-th type of abrasive grains (calculated from the following formula 2) r _k : average for the k-th type of abrasive grains Abrasive grain radius [mm] A _k : Abrasive grain type coefficient regarding the k-th type of abrasive grain D: Diameter of the grinding stone [mm] B: Binder coefficient regarding the binder used for the grinding stone Here, the abrasive grain type coefficient The value of A _k is set as follows according to the type of abrasive grain, diamond: 8000 cubic boron nitride: 4700 silicon carbide: 2500 aluminum oxide: 2100 Here, the value of the binder coefficient B is set as follows according to the kind of binder, Metal: 3000 Resin: 30 Elastomer: 1 [number 2] c _k : Abrasive grain ratio [vol%] of the k-th abrasive grain. The method for manufacturing a glass plate according to claim 6, wherein in the grinding step, the difference between the value of G calculated according to the formula [1] and the value of P calculated according to the formula [3] The product satisfies the relationship of 1.0×10 ^-9 ≦G×P≦1.0×10 ^-6 , [numeral 3] v: Relative moving speed (processing speed) of the grinding stone and the end face of the glass plate [m/min] V: Peripheral speed of the grinding stone [m/min] L: Flow rate of water supplied to the grinding stone [L/min] F : Extrusion force [N] of the grinding stone pressing the end surface of the glass plate. The manufacturing method of the glass plate in any one of Claims 1-4 in which the temperature of the grinding point in the said grinding process is made higher than the temperature of the grinding point in the said grinding process. 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, a cooling medium is supplied to the grinding stone and the processing portion on the circumference of the grinding stone, respectively, In the grinding step, the supply amount of the cooling medium is reduced compared to the grinding step.

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