TW202035064A - Glass plate end face machining apparatus and method for manufacturing glass plate - Google Patents

Abstract

An end face machining apparatus 1 is provided with: a swingable arm member 4 that supports a grindstone 2; a servomotor 5 that generates a driving force for causing the grindstone 2 to press an end face E of a glass plate G; and a link mechanism 6 that transmits the driving force of the servomotor 5 to the arm member 4. The link mechanism 6 is provided with a first link member 6a that is swingable by the servomotor 5, and a second link member 6b connected in a swingable manner to each of the arm member 4 and the first link member 6a. The end face machining apparatus 1 is configured such that, in a state in which the grindstone 2 is in contact with the end face E of the glass plate G, an angle [Theta]1 which is formed by a direction Ar orthogonal to a longitudinal direction A of the first link member 6a and a longitudinal direction B of the second link member 6b is smaller than an angle [Theta]2 formed by a direction Cr orthogonal to a longitudinal direction C of the arm member 4 and the longitudinal direction B of the second link member 6b.

Description

End face processing device of glass plate and manufacturing method of glass plate

The invention relates to a glass plate end surface processing device and a glass plate manufacturing method.

In recent years, in order to meet the demand for improvement in the production efficiency of liquid crystal displays and the like, the demand for improvement in the production efficiency of glass substrates used in the displays and the like is increasing. Here, in the manufacture of a glass substrate, an operation of cutting out one or more glass substrates from a large glass original plate (formed original plate) is performed. In this way, a glass substrate of the required size can be obtained.

On the other hand, the end surface of the glass substrate cut from the original glass plate is usually a cut surface or a broken surface, so there are many minute scratches (defects). If there is a scratch on the end surface of the glass substrate, cracks or the like will occur from the scratch. Therefore, in order to prevent this phenomenon, the end surface of the glass substrate is subjected to grinding processing (rough processing) and polishing processing (finishing processing).

As an end surface processing device of a glass plate used in such end surface processing, for example, Patent Document 1 discloses a so-called constant pressure type end surface processing device, which includes: a swingable arm member and a support processing tool; And an actuator (pressing force generation device) generates a pressing force that is applied to the end surface of the glass plate from the processing tool via the arm member. [Prior Art Literature] [Patent Literature]

Patent Document 1: International Publication No. 2013/187400

[The problem to be solved by the invention] In general, in a constant-pressure type end surface machining device, for example, if the driving force of the actuator is too large, there is a problem that it is difficult to finely adjust the pressing force of the machining tool. Especially during grinding, the processing ability of the processing tool is generally high. Therefore, if the fine adjustment of the pressing force of the processing tool is not sufficient, the processing amount (cutting amount) may increase or decrease significantly and the desired processing cannot be achieved.

The subject of the present invention is to realize fine adjustment of the pressing force of the processing tool when processing the end surface of the glass plate. [Means to solve the problem]

The present invention created to solve the above-mentioned problem is a glass plate end surface processing device that uses a processing tool to process the end surface of the glass plate. The glass plate end surface processing device is characterized by including: a swingable arm member to support processing An actuator, which generates a driving force for the processing tool to press the end face of the glass plate; and a link mechanism, which transmits the driving force of the actuator to the arm member, the link mechanism includes: a first link member, The actuator swings; and the second link member is swingably connected to the arm member and the first link member, and is configured such that the first link member is in contact with the end surface of the glass plate when the processing tool The angle formed by the orthogonal direction of the longitudinal direction of the arm member and the longitudinal direction of the second link member is smaller than the angle formed by the orthogonal direction of the longitudinal direction of the arm member and the longitudinal direction of the second link member.

According to the above configuration, when the actuator moves the processing tool in the direction pressing against the end surface of the glass plate, of the force acting on the arm member pushed by the second link member, the force acting on the swing direction of the arm member The magnitude of the force component is smaller than the magnitude of the force of the first link member that swings by the actuator to push the second link member. Similarly, when the actuator moves the processing tool in a direction away from the end surface of the glass plate, the force acting on the arm member pulled by the second link member is the component of the force acting on the swing direction of the arm member The magnitude is smaller than the magnitude of the force that the first link member swings by the actuator pulls the second link member. Therefore, even when the driving force of the actuator is large, the force acting in the swing direction of the arm member can be reduced, so that the pressing force of the processing tool on the end surface of the glass plate can be finely adjusted.

In the above configuration, it is preferable that the processing tool is a grindstone for grinding.

Generally speaking, compared with the grinding stone for grinding, the processing amount of the grinding stone for grinding is easy to vary greatly according to the pressing force pressed to the end surface of a glass plate. On the other hand, if it is set as the structure which can finely adjust the pressing force with which a processing tool presses the end surface of a glass plate like this invention, even if it is a grindstone for grinding, it is easy to control a desired processing amount.

The present invention created to solve the above-mentioned problems is a method of manufacturing a glass plate, including an end surface processing step. The end surface processing step is to process the end surface of the glass plate with a processing tool by an end surface processing device. The manufacturing method is characterized in that the end surface processing device includes: a swingable arm member to support the processing tool; an actuator to generate a driving force for the processing tool to press the end surface of the glass plate; and a link mechanism to transfer the driving force of the actuator Transmitted to the arm member, the link mechanism includes: a first link member that can be swung by an actuator; and a second link member that is swingably connected to the arm member and the first link member, and is processed on the end surface In the step, in the state that the processing tool is in contact with the end surface of the glass plate, the angle formed by the orthogonal direction of the longitudinal direction of the first link member and the longitudinal direction of the second link member is smaller than the long side of the arm member The angle formed by the orthogonal direction of the direction and the longitudinal direction of the second link member.

If so, for the same reason as the aforementioned configuration, in the end surface processing step, the pressing force of the processing tool against the end surface of the glass plate can be finely adjusted. [Effects of the invention]

According to the present invention, when the end surface of the glass plate is processed, the pressing force of the processing tool can be finely adjusted.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in Fig. 1, the end surface processing device 1 includes: a motor 3, which drives a grinding stone 2 as a processing tool to rotate; an arm member 4, which rotatably supports the grinding stone 2; and a servo motor 5 as an actuator, which generates a grinding stone 2 The driving force of pressing the end face E of the glass plate G; and the link mechanism 6 which transmits the driving force of the servo motor 5 to the arm member 4. Such an end surface processing apparatus 1 is called a so-called constant pressure type.

For the motor 3 that drives the grindstone 2 to rotate, a synchronous motor, an induction motor, a servo motor, etc. can be used, but it is not limited to this.

The arm member 4 is rotatably supported by the support shaft member 7 and can swing around the support shaft member 7. The supporting shaft member 7 supports the middle portion of the arm member 4. One end of the arm member 4 supports the motor 3 and supports the grindstone 2 via the motor 3. The other end of the arm member 4 is connected to the link mechanism 6. In addition, although illustration is omitted, the swing track of the arm member 4 is provided with a stopper that limits the swing range of the arm member 4. The stopper can be retracted from the arm member 4 while the grindstone 2 is in contact with the end surface E of the glass plate G.

The servo motor 5 for pressing the grindstone 2 to the end face E of the glass plate G includes a motor shaft 5a and a control part 5b that can rotate forward and backward, and performs feedback control.

The link mechanism 6 includes a first link member 6a and a second link member 6b so as to be swingable. One end of the first link member 6a is fixed to the motor shaft 5a of the servo motor 5, and the other end thereof is swingably connected to one end of the second link member 6b via the first joint 6c. That is, the first link member 6a swings around the motor shaft 5a due to the rotation of the motor shaft 5a. The other end of the second link member 6b is swingably connected to the other end of the arm member 4 via a second joint 6d. Furthermore, in the present embodiment, the center of the second joint 6d, the center of the support shaft member 7, and the center of the rotation shaft 2a of the grindstone 2 are arranged on the same straight line.

As shown in FIG. 2, when the motor shaft 5a of the servo motor 5 rotates in the counterclockwise direction, the link mechanism 6 also causes the arm member 4 to rotate in the counterclockwise direction with the support shaft member 7 as the center. Along with this, the grindstone 2 moves in the direction pressing against the end surface E of the glass plate G, and the force with which the grindstone 2 presses the end surface E of the glass plate G increases. On the other hand, as shown in FIG. 3, when the motor shaft 5a of the servo motor 5 rotates in the clockwise direction, the link mechanism 6 also rotates the arm member 4 in the clockwise direction with the support shaft member 7 as the center. Along with this, the grindstone 2 moves in a direction away from the end surface E of the glass plate G, and the force with which the grindstone 2 presses the end surface E of the glass plate G decreases.

The control unit 5b monitors the speed, torque, and position of the motor shaft 5a of the servo motor 5 through feedback control. Based on the speed, torque, and position, the motor shaft 5a of the servo motor 5 is rotated forward and backward, thereby controlling the position or pressing force of the grindstone 2.

The grindstone 2 may be, for example, a grindstone for grinding whose main purpose is chamfering of the end surface E, or a grindstone for grinding whose main purpose is to flatten the fine unevenness of the end surface E. The particle size of the abrasive grains in the grindstone for grinding is the same as or larger than the particle size of the abrasive grains in the grindstone for grinding. The particle size of the abrasive grains in the grindstone for grinding can be set to #100 to #1000, for example, and the particle size of the abrasive grains in the grindstone for polishing can be set to, for example, #200 to #1000. The diameter of the grindstone 2 is, for example, 100 mm to 200 mm.

As shown in FIG. 1, in this embodiment, the two end surface processing apparatuses 1 are arrange|positioned at the position which pinches the glass plate G and opposes. That is, the end surfaces E of the two opposing sides of the glass plate G are processed at the same time. Furthermore, a plurality of end surface processing devices 1 may be arranged on one side of the glass plate G. At this time, the type of the grindstone 2 of each end surface processing apparatus 1 may be the same or different. For example, the grindstone 2 of the end surface processing device 1 that processes the upstream side of the end surface E first can be used as a grinding stone for grinding, and the grindstone 2 of the end surface processing device 1 that processes the downstream side of the end surface E immediately thereafter Set as a grindstone for polishing.

The glass plate G to be processed by the end surface processing device 1 has, for example, a rectangular plate shape. The thickness dimension of the glass plate G is, for example, preferably 0.05 mm to 10 mm, and more preferably 0.2 mm to 0.7 mm. Of course, the glass plate G to which the present invention can be applied is not limited to the above-mentioned form. For example, the present invention can also be applied to a glass plate having a shape other than a rectangle (for example, a polygon) or a glass plate having a thickness dimension other than 0.05 mm to 10 mm.

The glass plate G can move relative to the grindstone 2 along a predetermined feeding direction X. In addition, FIG. 1 shows a case where the glass plate G moves in the feed direction X and the grindstone 2 is fixed. Of course, the glass plate G may be fixed and the grindstone 2 may move in a direction opposite to the feeding direction X, or both the glass plate G and the grindstone 2 may be moved.

Next, the manufacturing method of the glass plate using the end surface processing apparatus 1 of the said structure is demonstrated.

The manufacturing method of this embodiment includes: a preparation step of preparing a glass plate G; and an end surface processing step of processing the end surface E of the prepared glass plate G. In addition, steps such as cleaning, inspection, and packing of the glass plate G may be performed after the end surface processing step. The end face processing step can also be implemented separately.

In the preparation step, first, a formed original plate is obtained by a known forming method. Subsequently, this formed original plate is cut out into a predetermined size, thereby obtaining a glass plate G as a processing target of the end surface processing apparatus 1. As the forming method, for example, a down-draw method such as an overflow down draw method, a slot down draw method, and a redraw method, or a float method can be used. Among them, the overflow down-draw method can make the surfaces on both sides become flame-polished surfaces to achieve high surface quality, which is particularly preferred. The glass plate G is used for, for example, a glass substrate for flat panel displays such as liquid crystal displays.

In the end face processing step, first, by the rotation of the servo motor 5, the grindstone 2 in the rotating state is arranged at a predetermined position. In this state, the glass plate G is conveyed along the feed direction X, and the grindstone 2 is brought into contact with the end surface E of the glass plate G. At the start of this processing (during the processing of the portion indicated by the symbol Ea in FIG. 1 ), the grindstone 2 is about to leave the glass plate G due to the impact accompanying the contact between the grindstone 2 and the end surface E of the glass plate G. In order to cope with this situation, the control unit 5b performs feedback control (for example, Proportional Integral Differential (PID) control) of the speed and torque of the motor shaft 5a of the servo motor 5. Specifically, the control unit 5 b detects the movement of the arm member 4 that moves together with the grindstone 2 based on the speed of the motor shaft 5 a of the servo motor 5. Based on the detection result, the control unit 5b controls the speed and torque of the motor shaft 5a of the servo motor 5 to suppress the movement of the arm member 4. Thereby, the pressing force of the grindstone 2 is adjusted so that the grindstone 2 does not leave the end surface E of the glass plate G. Therefore, it is possible to prevent the bounce (bound) of the grindstone 2 at the start of processing.

In addition, in the processing of the middle part (the part between the part indicated by the symbol Ea and the part indicated by the symbol Eb) in the conveying direction of the end face E of the glass plate G, the motor shaft 5a of the servo motor 5 is also processed Feedback control of speed and torque. At this time, change the ratio of speed control and torque control to increase the ratio of torque control. The ratio can be changed by changing the gain setting. Thereby, the processing amount of the end surface E of the glass plate G can be maintained constant in the conveyance direction.

When the end face processing is completed, the contact between the grindstone 2 and the end face E of the glass plate G is released, and therefore the torque of the motor shaft 5a of the servo motor 5 is drastically reduced. Therefore, at the end of the machining (during the machining of the portion indicated by the symbol Eb), the control unit 5b performs feedback control of the speed and torque of the motor shaft 5a of the servo motor 5 so that the position of the grindstone 2 is fixed. In addition, the control method performed by the control part 5b is an example, and is not limited to this.

As shown in Figures 2 and 3, in the end face processing step, there is a situation in which the motor shaft 5a of the servo motor 5 rotates in a counterclockwise direction, so that the grindstone 2 is pressed against the end face E of the glass plate G When it moves in the direction; and when the motor shaft 5a of the servo motor 5 rotates in the clockwise direction, the grindstone 2 moves in a direction away from the end surface E of the glass plate G.

When the angle formed by the orthogonal direction Ar of the longitudinal direction A of the first link member 6a in the first joint 6c and the longitudinal direction B of the second link member 6b is set as θ1, the second joint 6d When the angle formed by the orthogonal direction Cr of the longitudinal direction C of the arm member 4 and the longitudinal direction B of the second link member 6b is set to θ2, the relationship of θ1<θ2 is established. The angular relationship of θ1 and θ2 is always satisfied during the period from the start of the processing of the end face E of the glass plate G to the end of the processing.

Here, θ1 and θ2 refer to angles in a state where the grindstone 2 is in contact with the end face E of the glass plate G that is the processing target. In addition, the longitudinal direction A of the first link member 6a refers to the direction of the straight line connecting the center of the motor shaft 5a of the servo motor 5 (the swing center of the first link member 6a) and the center of the first joint 6c, and the second The longitudinal direction B of the link member 6b refers to the direction of a straight line connecting the center of the first joint 6c and the center of the second joint 6d, and the longitudinal direction C of the arm member 4 refers to connecting the center of the second joint 6d and the support shaft The direction of the straight line of the center of the member 7 (the swing center of the arm member 4).

As shown in Figure 2, when the grindstone 2 is moved in the pressing direction, the force of the first link member 6a pushing the second link member 6b (strictly speaking, the force pushing the first joint 6c) F1 The direction is parallel to the orthogonal direction Ar of the longitudinal direction A of the first link member 6a. On the other hand, of the force (strictly speaking, the force acting on the second joint 6d) acting on the arm member 4 pushed by the second link member 6b, the force F2 that causes the arm member 4 to swing in the counterclockwise direction The direction of is parallel to the orthogonal direction Cr of the longitudinal direction C of the arm member 4. Therefore, the relationship of F2=F1cosθ2/cosθ1 is established, and since θ1 is smaller than θ2, F2 is smaller than F1.

Similarly, as shown in FIG. 3, when the grindstone 2 is moved away from the direction, the force of the first link member 6a pulling the second link member 6b (strictly speaking, the force pulling the first joint 6c) F3 The direction of is also parallel to the orthogonal direction Ar of the longitudinal direction A of the first link member 6a (opposite to F1). On the other hand, of the force (strictly speaking, the force acting on the second joint 6d) acting on the arm member 4 pulled by the second link member 6b, the force F4 that causes the arm member 4 to swing in the clockwise direction The direction of is parallel to the orthogonal direction Cr of the longitudinal direction C of the arm member 4 (opposite to F2). Therefore, the relationship of F4=F3cosθ2/cosθ1 is established, and since θ1 is smaller than θ2, F4 is smaller than F3.

Therefore, even if the driving force (output range) of the servo motor 5 is large, the force acting on the arm member 4 can be reduced, so the pressing force of the grindstone 2 against the end surface E of the glass plate G can be finely adjusted.

θ2 may be an angle exceeding 0°, and θ1 may be, for example, 0° or more. As long as θ2-θ1 is increased, the pressing force can be adjusted more finely, but the maximum pressing force is reduced. In consideration of both considerations, θ2-θ1 is, for example, preferably 5° to 85°, more preferably 15° to 75°, and most preferably 25° to 65°. For example, cosθ2/cosθ1 is preferably 0.2 to 0.98, more preferably 0.4 to 0.96, and most preferably 0.6 to 0.94.

Furthermore, the sizes of θ1 and θ2 can be changed, for example, by changing the dimensions in the longitudinal direction of the arm member 4, the first link member 6a and the second link member 6b, or the motor shaft 5a and the support shaft member 7 of the servo motor 5. The installation position is adjusted.

As mentioned above, although the embodiment of this invention was described, the end surface processing apparatus and manufacturing method of the glass plate of this invention are of course not limited to this form, Various forms can be adopted within the scope of the present invention.

In the above-mentioned embodiment, the following has been described. That is, in the arm member 4, the second joint 6d, the supporting shaft member 7 and the rotating shaft 2a of the grindstone 2 are arranged on the same straight line, but the arm member 4 is also The shape may be such that the straight line connecting the center of the second joint 6d and the center of the supporting shaft member 7 and the straight line connecting the center of the supporting shaft member 7 and the center of the rotating shaft 2a of the grindstone 2 are not arranged in the same line Instead, the line has an angle less than 180°. However, at this time, the longitudinal direction C of the arm member 4 is also defined in the direction of the straight line connecting the center of the second joint 6d and the center of the support shaft member 7.

In the above embodiment, the grindstone 2 is exemplified as the processing tool, but the processing tool may be a tool other than the grindstone as long as it can process the end surface E of the glass plate G.

In the above-mentioned embodiment, the servomotor 5 having the motor shaft 5a is exemplified as the actuator, but the actuator may be other than a servomotor such as a pneumatic actuator, a hydraulic actuator, or an electromechanical actuator. Well-known actuator.

In the above embodiment, FIGS. 2 and 3 illustrate the case where the orthogonal direction Ar of the longitudinal direction A of the first link member 6a is reversed from the longitudinal direction B of the second link member 6b The clockwise direction has an angle of θ1, and the orthogonal direction Cr of the longitudinal direction C of the arm member 4 has an angle of θ2 from the longitudinal direction B of the second link member 6b to the clockwise direction, but the second link member 6b The directions of θ1 and θ2 based on the longitudinal direction B of φ are not particularly limited.

That is, as shown in FIG. 4, the orthogonal direction Cr of the longitudinal direction C of the arm member 4 may have an angle of θ2 in the counterclockwise direction from the longitudinal direction B of the second link member 6b (the direction of θ2 is opposite).

In addition, as shown in FIG. 5, the orthogonal direction Ar of the longitudinal direction A of the first link member 6a may have an angle of θ1 (the direction of θ1) from the longitudinal direction B of the second link member 6b in the clockwise direction. in contrast).

Furthermore, as shown in FIG. 6, the orthogonal direction Ar of the longitudinal direction A of the first link member 6a may have an angle of θ1 clockwise from the longitudinal direction B of the second link member 6b, and the arm member The orthogonal direction Cr of the longitudinal direction C of 4 has an angle of θ2 in the counterclockwise direction from the longitudinal direction B of the second link member 6b (the directions of θ1 and θ2 are opposite).

1: End face processing device 2: Grinding stone (processing tool) 2a: Rotation axis 3: motor 4: arm member 5: Servo motor (actuator) 5a: Motor shaft 5b: Control Department 6: Linkage mechanism 6a: The first link member 6b: The second link member 6c: First connector 6d: second connector 7: Support shaft member A: Long side direction of the first link member Ar, Cr: orthogonal direction B: Long side direction of the second link member C: The direction of the long side of the arm member E: end face Ea, Eb: Symbol F1, F2, F3, F4: Force G: Glass plate X: Feed direction θ1, θ2: angle

Fig. 1 is a plan view showing an end surface processing apparatus according to an embodiment of the present invention. Fig. 2 is a plan view showing an enlarged part of the end surface processing device of Fig. 1. Fig. 3 is a plan view showing an enlarged part of the end surface processing device of Fig. 1. Fig. 4 is a plan view showing an enlarged part of an end surface processing apparatus according to another embodiment of the present invention. Fig. 5 is a plan view showing an enlarged part of an end surface processing apparatus according to another embodiment of the present invention. Fig. 6 is an enlarged plan view showing a part of an end surface processing apparatus according to another embodiment of the present invention.

1: End face processing device

2: Grinding stone (processing tool)

2a: Rotation axis

3: motor

4: arm member

5: Servo motor (actuator)

5a: Motor shaft

5b: Control Department

6: Linkage mechanism

6a: The first link member

6b: The second link member

6c: First connector

6d: second connector

7: Support shaft member

A: Long side direction of the first link member

Ar, Cr: orthogonal direction

B: Long side direction of the second link member

C: The direction of the long side of the arm member

E: end face

Ea: Symbol

F1, F2: Force

G: Glass plate

θ1, θ2: angle

Claims (3)

An end surface processing device of a glass plate uses a processing tool to process the end surface of the glass plate. The end surface processing device of the glass plate is characterized by comprising: A swingable arm member that supports the processing tool; an actuator that generates a driving force for the processing tool to press the end surface of the glass plate; and a link mechanism that transmits the driving force of the actuator To the arm member, The link mechanism includes: a first link member capable of swinging by the actuator; and a second link member that is swingably connected to the arm member and the first link member, The end surface processing device of the glass plate is configured such that, in a state where the processing tool is in contact with the end surface of the glass plate, a direction orthogonal to the longitudinal direction of the first link member and the second The angle formed by the longitudinal direction of the link member is smaller than the angle formed by the orthogonal direction of the longitudinal direction of the arm member and the longitudinal direction of the second link member. The end surface processing device of a glass plate according to claim 1, wherein The processing tool is a grinding stone for grinding. A method for manufacturing a glass plate includes an end surface processing step, wherein the end surface processing step is to process the end surface of the glass plate using a processing tool by an end surface processing device. The manufacturing method of the glass plate is characterized in that: The end surface processing device includes: a swingable arm member to support the processing tool; an actuator to generate a driving force for the processing tool to press the end surface of the glass plate; and a link mechanism to actuate the The driving force of the actuator is transmitted to the arm member, The link mechanism includes: a first link member capable of swinging by the actuator; and a second link member that is swingably connected to the arm member and the first link member, In the end surface processing step, in a state where the processing tool is in contact with the end surface of the glass plate, the direction orthogonal to the longitudinal direction of the first link member and the second link member The angle formed by the longitudinal direction of the arm member is smaller than the angle formed by the orthogonal direction of the longitudinal direction of the arm member and the longitudinal direction of the second link member.

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