JP2020163521A - Glass plate end surface processing device and glass plate manufacturing method - Google Patents

Abstract

To satisfactorily maintain processing quality of a glass plate end surface by assuring a pressing force of a processing tool for the glass plate end surface.SOLUTION: An end surface processing device 1 comprises: an oscillative arm member 4 for supporting a grindstone 2; a servo motor 5 which generates drive power in order that the grindstone 2 presses an end surface E of a glass plate G; and a linkage 6 which transmits drive power of the servo motor 5 to the arm member 4. The linkage 6 comprises: a first link member 6a which can be oscillated by the servo motor 5; and a second link member 6b which is so connected to the arm member 4 and the first link member 6a respectively as to be capable of oscillating. The end surface processing device 1 is so configured that in the state that the grindstone 2 contacts the end surface E of the glass plate G, an angle θ1 between a direction Ar orthogonal to a longer direction A of the first link member 6a and a longer direction B of the second link member 6b becomes smaller than an angle θ2 between a direction Cr orthogonal to a longer direction C of the arm member 4 and the longer direction B of the second link member 6b.SELECTED DRAWING: Figure 2

Description

The present invention relates to an end face processing apparatus for a glass plate and a method for manufacturing a glass plate.

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 manufacturing efficiency of the glass substrate used for the display and the like is increasing. Here, in the manufacture of a glass substrate, one or a plurality of glass substrates are cut out from a large glass original plate (molded original plate). As a result, a glass substrate having a desired size can be obtained.

On the other hand, since the end face of the glass substrate cut out from the glass original plate is usually a cut surface or a folded surface, there are often minute scratches (defects). If there is a scratch on the end face of the glass substrate, cracks will occur from the scratch, so in order to prevent this, grinding (roughing) and polishing (finishing) are performed on the end face of the glass substrate. To.

As an end face processing device for a glass plate used for this type of end face processing, for example, Patent Document 1 describes a swingable arm member that supports a processing tool, and the processing tool to the end face of the glass plate via the arm member. A so-called constant pressure type end face processing device including an actuator (pressing pressure generating element) for generating an acting pressing force is disclosed.

International Publication No. 2013/187400

In the constant pressure type end face processing device, the pressing force of the processing tool against the end face of the glass plate may be insufficient depending on the processing conditions such as the type of grindstone and the type of glass. In this case, the processing quality of the end face of the glass plate is poor. descend. For example, when a grindstone for polishing is used, it is necessary to strongly press the processing tool against the glass plate, so that the pressing force is insufficient and the processing quality tends to deteriorate.

An object of the present invention is to maintain good processing quality of the end face of the glass plate by ensuring a pressing force of the processing tool against the end face of the glass plate.

The present invention, which was devised to solve the above problems, is an end face processing device for a glass plate that processes the end face of the glass plate with a processing tool, and is a swingable arm member that supports the processing tool and a processing tool. Equipped with an actuator that generates a driving force for pressing the end face of the glass plate and a link mechanism that transmits the driving force of the actuator to the arm member, and the link mechanism is a first link member that can be swung by the actuator. , A second link member oscillatingly connected to each of the arm member and the first link member, and in a state where the processing tool is in contact with the end face of the glass plate, the direction perpendicular to the longitudinal direction of the first link member. It is characterized in that the angle formed by the second link member and the longitudinal direction of the second link member is larger than the angle formed by 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 of pressing against the end face of the glass plate, the first link member swung by the actuator is larger than the magnitude of the force pushing the second link member. Of the forces acting on the arm member pushed by the two-link member, the magnitude of the component of the force acting in the swing direction of the arm member is larger. That is, by amplifying the driving force of the actuator by the link mechanism, the pressing force of the processing tool against the end surface of the glass plate can be increased, so that the processing quality of the end surface of the glass plate can be maintained satisfactorily.

In the above configuration, the processing tool is preferably a grindstone for polishing.

Generally, a grindstone for polishing needs to have a larger pressing force against the end face of a glass plate than a grindstone for grinding. If the pressing force for the processing tool to press the end face of the glass plate can be increased as in the present invention, it becomes easy to secure the required pressing force even with a grindstone for polishing.

The present invention, which was devised to solve the above problems, is a method for manufacturing a glass plate including an end face processing step of processing the end face of the glass plate with a processing tool by an end face processing device. It is provided with a swingable arm member that supports the tool, an actuator that generates a driving force for the processing tool to press the end face of the glass plate, and a link mechanism that transmits the driving force of the actuator to the arm member. The mechanism includes a first link member that can be swung by an actuator and a second link member that is swingably connected to each of the arm member and the first link member. In the end face processing step, the processing tool is glass. In contact with the end face of the plate, the angle formed by the longitudinal direction of the first link member and the longitudinal direction of the second link member is the orthogonal direction of the longitudinal direction of the arm member and the longitudinal direction of the second link member. It is characterized by being larger than the angle between the two.

By doing so, for the same reason as the above-described configuration, even when the driving force of the actuator is small, the pressing force of the processing tool pressing the end face of the glass plate is increased in the end face processing step, and the glass plate is formed. The processed quality of the end face can be maintained well.

According to the present invention, by ensuring the pressing force of the processing tool against the end surface of the glass plate, the processing quality of the end surface of the glass plate can be maintained satisfactorily.

It is a top view which shows the end face processing apparatus which concerns on embodiment of this invention. It is a top view which shows the part of the end face processing apparatus of FIG. 1 enlarged. It is a top view which shows the part of the end face processing apparatus which concerns on other embodiment of this invention in an enlarged manner. It is a top view which shows the part of the end face processing apparatus which concerns on other embodiment of this invention in an enlarged manner. It is a top view which shows the part of the end face processing apparatus which concerns on other embodiment of this invention in an enlarged manner.

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

As shown in FIG. 1, in the end face processing device 1, the motor 3 that rotationally drives the grindstone 2 as a processing tool, the arm member 4 that rotatably supports the grindstone 2, and the grindstone 2 rotatably support the end face E of the glass plate G. It includes a servomotor 5 as an actuator that generates a driving force for pressing, and a link mechanism 6 that transmits the driving force of the servomotor 5 to the arm member 4. Such an end face processing device 1 is a so-called constant pressure type.

A synchronous motor, an induction motor, a servomotor, or the like can be used as the motor 3 for rotationally driving the grindstone 2, but the motor 3 is not limited thereto.

The arm member 4 is rotatably supported by the support shaft member 7, and can swing around the support shaft member 7. The support shaft member 7 supports an intermediate portion of the arm member 4. One end of the arm member 4 supports the motor 3, and the grindstone 2 is supported via the motor 3. The other end of the arm member 4 is connected to the link mechanism 6. Although not shown, a stopper for regulating the swing range of the arm member 4 is provided on the swing track 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 servomotor 5 for pressing the grindstone 2 against the end surface E of the glass plate G includes a motor shaft 5a that can rotate in the forward and reverse directions and a control unit 5b, and feedback control is performed.

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 servomotor 5, and the other end 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. 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 servomotor 5 rotates counterclockwise, the link mechanism 6 also rotates the arm member 4 counterclockwise around the support shaft member 7. Along with this, the grindstone 2 moves in the direction of being pressed against the end face E of the glass plate G, and the force with which the grindstone 2 presses the end face E of the glass plate G increases. On the other hand, contrary to FIG. 2, when the motor shaft 5a of the servomotor 5 rotates clockwise, the arm member 4 also rotates clockwise around the support shaft member 7 by the link mechanism 6. Along with this, the grindstone 2 moves in a direction of escaping with respect to the end face E of the glass plate G, and the force with which the grindstone 2 presses the end face E of the glass plate G decreases.

The control unit 5b monitors the speed, torque, and position of the motor shaft 5a of the servomotor 5 by feedback control. The position and pressing force of the grindstone 2 are controlled by rotating the motor shaft 5a of the servomotor 5 in the forward and reverse directions according to the speed, torque and position.

The grindstone 2 may be, for example, a grindstone for grinding whose main purpose is chamfering the end face E, or a grindstone for polishing whose main purpose is to even out minute irregularities on the end face E. The particle size of the abrasive grains in the grinding wheel for polishing is the same as or larger than the particle size of the abrasive grains in the grinding wheel for grinding. The particle size of the abrasive grains in the grinding wheel for grinding can be, for example, # 100 to # 1000, and the particle size of the abrasive grains in the grinding wheel for polishing can be, for example, # 200 to # 1000. The diameter of the grindstone 2 is, for example, 100 to 200 mm.

As shown in FIG. 1, in the present embodiment, the two end face processing devices 1 are arranged at positions facing each other with the glass plate G interposed therebetween. That is, the end faces E of the two opposite sides of the glass plate G are processed at the same time. A plurality of end face processing devices 1 may be arranged on one side of the glass plate G. In this case, the type of the grindstone 2 of each end face processing device 1 may be the same or different. For example, the grindstone 2 of the upstream end face processing device 1 that processes the end face E first is used as a grindstone for grinding, and the grindstone 2 of the downstream end face processing device 1 that processes the end face E later is polished following this. It may be used as a grindstone.

The glass plate G to be processed by the end face processing apparatus 1 has, for example, a rectangular plate shape. The thickness dimension of the glass plate G is preferably, for example, 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 form. For example, the present invention can be applied to a glass plate having a shape other than a rectangle (for example, a polygon) and a glass plate having a thickness dimension of more than 0.05 mm to 10 mm.

The glass plate G can move relative to the grindstone 2 along a predetermined feed direction X. Note that 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 the direction opposite to the feed direction X, or both the glass plate G and the grindstone 2 may move.

Next, a method of manufacturing a glass plate using the end face processing device 1 having the above configuration will be described.

The manufacturing method according to the present embodiment includes a preparatory step for preparing the glass plate G and an end face processing step for processing the end face E of the prepared glass plate G. After the end face processing step, steps such as cleaning, inspection, and packing of the glass plate G may be performed. The end face processing step can be carried out independently.

In the preparatory step, first, a molded original plate is obtained by a known molding method. After that, the molded original plate is cut out to a predetermined size to obtain a glass plate G to be processed by the end face processing apparatus 1. As the molding method, for example, a down draw method such as an overflow down draw method, a slot down draw method, or a redraw method, or a float method can be used. Above all, the overflow down draw method is preferable because the surfaces on both sides become fire-made surfaces and high surface quality can be realized. The glass plate G is used as a glass substrate for a flat panel display such as a liquid crystal display.

In the end face processing step, first, the rotated grindstone 2 is arranged at a predetermined position by the rotation of the servomotor 5. 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 reference numeral Ea in FIG. 1), the grindstone 2 tends to separate from the glass plate G due to the impact caused by the contact between the grindstone 2 and the end face E of the glass plate G. In order to correspond to this, the control unit 5b performs feedback control (for example, PID control) of the speed and torque of the motor shaft 5a of the servomotor 5. Specifically, the control unit 5b detects the movement of the arm member 4 that moves together with the grindstone 2 based on the speed of the motor shaft 5a of the servomotor 5. In response to this detection result, the control unit 5b controls the speed and torque of the motor shaft 5a of the servomotor 5 so as to suppress the movement of the arm member 4. As a result, the pressing force of the grindstone 2 is adjusted so that the grindstone 2 does not separate from the end surface E of the glass plate G. Therefore, it is possible to prevent the grindstone 2 from bouncing at the start of processing.

Further, even in the processing of the intermediate portion (the portion between the portion indicated by reference numeral Ea and the portion indicated by reference numeral Eb) in the transport direction in the end surface E of the glass plate G, the speed and torque of the motor shaft 5a of the servomotor 5 are fed back. Take control. At that time, the ratio of speed control and torque control is changed to increase the ratio of torque control. This ratio can be changed by changing the gain setting. As a result, the amount of processing of the end face E of the glass plate G can be kept constant in the transport 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, so that the torque of the motor shaft 5a of the servomotor 5 is sharply reduced. Therefore, at the end of machining (during machining of the portion indicated by reference numeral Eb), the control unit 5b performs feedback control of the speed and torque of the motor shaft 5a of the servomotor 5 so that the position of the grindstone 2 becomes constant. The above control method by the control unit 5b is an example, and is not limited to this.

As shown in FIG. 2, in the end face processing step, the motor shaft 5a of the servomotor 5 rotates counterclockwise to move the grindstone 2 in the direction of pressing against the end face E of the glass plate G. Although omitted, the motor shaft 5a of the servomotor 5 may rotate clockwise to move the grindstone 2 in a direction of pulling it away from the end surface E of the glass plate G.

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 θ1, and the orthogonal direction of the longitudinal direction C of the arm member 4 in the second joint 6d. Assuming that the angle formed by Cr and the longitudinal direction B of the second link member 6b is θ2, the relationship of θ1> θ2 is established. The angular relationship between θ1 and θ2 is always satisfied from the start of machining to the end of machining of the end face E of the glass plate G.

Here, θ1 and θ2 mean angles in a state where the grindstone 2 is in contact with the end face E of the glass plate G to be processed. Further, the longitudinal direction A of the first link member 6a means the direction of a straight line connecting the center of the motor shaft 5a of the servomotor 5 (the swing center of the first link member 6a) and the center of the first joint 6c. The longitudinal direction B of the second link member 6b means 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 is the center of the second joint 6d. It means the direction of a straight line connecting the center of the support shaft member 7 (the swing center of the arm member 4).

As shown in FIG. 2, when the grindstone 2 is moved in the pressing direction, the force F1 for the first link member 6a to push the second link member 6b (strictly speaking, the force for pushing the first joint 6c) is the first. The direction is parallel to the orthogonal direction Ar of the longitudinal direction A of the link member 6a. On the other hand, of the forces acting on the arm member 4 pushed by the second link member 6b (strictly speaking, the force acting on the second joint 6d), the force F2 that causes the arm member 4 to swing counterclockwise is The direction is parallel to the orthogonal direction Cr in the longitudinal direction C of the arm member 4. Therefore, the relationship F2 = F1cosθ2 / cosθ1 is established, and since θ1 is larger than θ2, F2 is larger than F1. That is, by amplifying the driving force of the servomotor 5 by the link mechanism 6, the pressing force of the grindstone 2 pressing the end surface E of the glass plate G can be increased. Therefore, for example, even when the driving force (output range) of the servomotor 5 is small or when a grindstone for polishing that requires a large pressing force is used, the required pressing force can be secured.

θ1 may be an angle exceeding 0 °, and θ2 may be, for example, 0 ° or more. If θ1-θ2 is increased, the pressing force can be further increased, but it becomes difficult to finely adjust the pressing force. From the viewpoint of achieving both of these, θ1-θ2 is preferably, for example, 5 to 85 °, more preferably 7.5 to 70 °, and most preferably 10 to 45 °. cosθ2 / cosθ1 is preferably, for example, 1.02 to 20, more preferably 1.04 to 10, and most preferably 1.06 to 5.

The sizes of θ1 and θ2 include, for example, the longitudinal dimensions of the arm member 4, the first link member 6a, and the second link member 6b, and the mounting positions of the motor shaft 5a and the support shaft member 7 of the servomotor 5. It can be adjusted by changing it.

Although the embodiment of the present invention has been described above, of course, the end face processing apparatus and the manufacturing method of the glass plate according to the present invention are not limited to this form, and various forms can be taken within the scope of the present invention. Is.

In the above embodiment, the case where the second joint 6d, the support shaft member 7, and the rotation shaft 2a of the grindstone 2 are arranged on the same straight line in the arm member 4 has been described, but the arm member 4 is the second joint. The straight line connecting the center of 6d and the center of the support shaft member 7 and the straight line connecting the center of the support shaft member 7 and the center of the rotation shaft 2a of the grindstone 2 are not arranged on the same straight line and are less than 180 °. It may have a shape having an angle to form. Even in this case, the longitudinal direction C of the arm member 4 is defined as the direction of a 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 other than the grindstone as long as it can process the end face E of the glass plate G.

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

In the above embodiment, in FIG. 2, the orthogonal direction Ar of the longitudinal direction A of the first link member 6a has an angle of θ1 counterclockwise from the longitudinal direction B of the second link member 6b, and the arm member 4 Although the case where the orthogonal direction Cr in the longitudinal direction C has an angle of θ2 clockwise from the longitudinal direction B of the second link member 6b is illustrated, the cases of θ1 and θ2 with respect to the longitudinal direction B of the second link member 6b are illustrated. The orientation is not particularly limited.

That is, as shown in FIG. 3, the orthogonal direction Cr in the longitudinal direction C of the arm member 4 may have an angle of θ2 counterclockwise from the longitudinal direction B of the second link member 6b (direction of θ2). Is the opposite).

Further, as shown in FIG. 4, the orthogonal direction Ar in 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 (θ1). The direction is opposite).

Further, as shown in FIG. 5, the orthogonal direction Ar of the longitudinal direction A of the first link member 6a has an angle of θ1 clockwise from the longitudinal direction B of the second link member 6b, and the longitudinal direction of the arm member 4 The orthogonal direction Cr of C may have an angle of θ2 counterclockwise 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 Whetstone (processing tool)
3 Motor 4 Arm member 5 Servo motor (actuator)
5a Motor shaft 5b Control unit 6 Link mechanism 6a First link member 6b Second link member 6c First joint 6d Second joint 7 Support shaft member G Glass plate E End face

Claims (3)

An end face processing device for glass plates that processes the end faces of glass plates with a processing tool.
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 that transmits the driving force of the actuator to the arm member. With a mechanism,
The link mechanism includes a first link member that can be swung by the actuator, and a second link member that is swingably connected to each of the arm member and the first link member.
With the processing tool in contact with the end face of the glass plate, the angle formed by the longitudinal direction of the first link member and the longitudinal direction of the second link member is orthogonal to the longitudinal direction of the arm member. An end face processing device for a glass plate, characterized in that it is configured to be larger than the angle formed by the direction and the longitudinal direction of the second link member. The end face processing device for a glass plate according to claim 1, wherein the processing tool is a grindstone for polishing. It is a method for manufacturing a glass plate including an end face processing process in which the end face of the glass plate is processed with a processing tool by an end face processing device.
The end face processing apparatus uses the 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 the driving force of the actuator. Equipped with a link mechanism that transmits to the arm member,
The link mechanism includes a first link member that can be swung by the actuator, and a second link member that is swingably connected to each of the arm member and the first link member.
In the end face processing step, the angle formed by the orthogonal direction in the longitudinal direction of the first link member and the longitudinal direction of the second link member in a state where the processing tool is in contact with the end surface of the glass plate is the arm. A method for manufacturing a glass plate, characterized in that the angle is larger than the angle formed by the direction orthogonal to the longitudinal direction of the member and the longitudinal direction of the second link member.

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