WO2020203098A1

WO2020203098A1 - Glass plate end face processing device and glass plate manufacturing method

Info

Publication number: WO2020203098A1
Application number: PCT/JP2020/010333
Authority: WO
Inventors: 真澄伊吹
Original assignee: 日本電気硝子株式会社
Priority date: 2019-04-01
Filing date: 2020-03-10
Publication date: 2020-10-08
Also published as: KR20210143167A; JP7337327B2; JP2020168667A; CN113474119A; TW202039146A

Abstract

A glass plate end face processing device (1) that processes an end face E of a glass plate G with a grindstone (2) is provided with: a swingable arm member (4) that supports the grindstone (2); a servomotor (5) that generates a driving force for causing the arm member (4) to swing; and a biasing device (7) that biases the arm member (4).

Description

Glass plate end face processing equipment and glass plate manufacturing method

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, the end face of the glass substrate cut out from the original glass plate is usually a cut surface or a folded surface, so that 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

Generally, in a constant pressure type end face processing device, when it is necessary to reduce the pressing force of the processing tool, the output (driving force) of the actuator is inevitably also reduced. However, there is a problem that the output of the actuator is not stable if it is too small compared to the rated output. As a result, the pressing force and / or the position of the processing tool may continue to fluctuate unreasonably, and the processing quality of the end face of the glass plate may deteriorate.

An object of the present invention is to maintain good processing quality of the end face of the glass plate even when the pressing force of the processing tool against the end face of the glass plate is small.

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 a glass plate with a processing tool, and is a swingable arm member that supports the processing tool and an arm member. It is characterized in that it includes an actuator that generates a driving force for swinging the glass, and an urging device that urges an arm member.

In this way, even when the pressing force of the processing tool against the end face of the glass plate is small, the driving force of the actuator (for example, a servomotor) is increased in order to cancel the urging force of the urging device, so that the output of the actuator is increased. Is stable. Therefore, the pressing force and / or the position of the processing tool is stable, and the processing quality of the end face of the glass plate can be maintained well.

In the above configuration, it is preferable that the urging device urges the arm member in the direction of pulling the processing tool away from the end face of the glass plate.

In this way, when the actuator is stopped, the processing tool is automatically separated from the end face of the glass plate by the urging force of the urging device, so that the glass plate can be prevented from being damaged.

In the above configuration, the urging device may be a spring that generates an urging force for urging the arm member.

In this way, the spring is inexpensive and durable, so that the equipment cost and running cost can be reduced.

In the above configuration, the urging device may be a cylinder that generates an urging force for urging the arm member.

In this way, the urging force is unlikely to change even if the cylinder expands and contracts, so it becomes easier to keep the urging force of the arm member constant.

In the above configuration, a method for manufacturing a glass plate including an end face processing step of processing the end face of a glass plate with a processing tool by an end face processing device, wherein the end face processing device is a swingable arm member that supports the processing tool. An actuator that generates a driving force for swinging the arm member is provided, and the arm member is urged in the end face processing step.

In this way, in the end face processing process, the output of the actuator is stabilized for the same reason as described above, so that the processed quality of the end face of the glass plate can be maintained well.

According to the present invention, even when the pressing force of the processing tool against the end face of the glass plate is small, the processing quality of the end face of the glass plate can be maintained satisfactorily.

It is a top view which shows the glass plate processing apparatus which concerns on 1st Embodiment. It is a top view of a part of the glass plate processing apparatus which concerns on 1st Embodiment. It is a top view of a part of the glass plate processing apparatus which concerns on 2nd Embodiment. It is a top view of a part of the glass plate processing apparatus which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the second and subsequent embodiments, the same reference numerals are given to the configurations common to the other embodiments, and detailed description thereof will be omitted.

(First Embodiment)
As shown in FIG. 1, in the end face processing device 1 according to the first embodiment, a motor 3 that rotationally drives the grindstone 2 as a processing tool, an arm member 4 that rotatably supports the grindstone 2, and an arm member 4 A servomotor 5 as an actuator that generates a driving force for swinging (because the grindstone 2 presses the end surface E of the glass plate G), and a link mechanism 6 that transmits the driving force of the servomotor 5 to the arm member 4. , An urging device 7 for urging the arm member 4.

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 8 and can swing around the support shaft member 8. The direction in which the arm member 4 swings includes a direction in which the grindstone 2 is separated from the end surface E of the glass plate G and a direction in which the grindstone 2 is pressed against the end surface E of the glass plate G. The support shaft member 8 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 that generates a driving force for the arm member 4 to swing is provided with 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. In the present embodiment, one end of the first link member 6a is fixed to the motor shaft 5a of the servomotor 5, and the other end is swingable to one end of the second link member 6b via the first joint 6c. Is connected to. 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 8, and the center of the rotation shaft 2a of the grindstone 2 are arranged on the same straight line. The servomotor 5 and the arm member 4 may be directly connected to each other, and the link mechanism 6 may be omitted.

The urging device 7 includes a tension spring 7a for generating an urging force that urges the arm member 4 in the swinging direction by the driving force of the servomotor 5. One end of the tension spring 7a is attached to the receiving portion 4a of the arm member 4, and the other end is attached to the base portion 9 or the like of the end face processing device 1. In the present embodiment, the tension spring 7a pulls in the arm member 4 in the direction in which the grindstone 2 separates from the end surface E of the glass plate G. That is, the tension spring 7a gives resistance to the swinging operation when the arm member 4 swings so that the grindstone 2 moves in the direction of being pressed against the end surface E of the glass plate G.

The attachment position (connection position) of the tension spring 7a to the arm member 4 is not particularly limited, but in the present embodiment, it is larger than the central position between the support shaft member 8 and the rotation shaft 2a of the grindstone 2. It is set at a position closer to the support shaft member 8. The reason why the mounting position of the tension spring 7a is brought close to the support shaft member 8 in this way is that the change in the amount of expansion and contraction of the tension spring 7a due to the swing of the arm member 4 is reduced, so that the urging force of the tension spring 7a is increased. This is to reduce fluctuations. If the tension spring 7a is attached to the arm member 4 in the vicinity of the support shaft member 8, the tension spring 7a is located closer to the support shaft member 8 than the central position between the support shaft member 8 and the second joint 6d. Even if there is, the same effect can be obtained.

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 8. 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 8 by the link mechanism 6. Along with this, the grindstone 2 moves in the direction of being separated from 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 in between. 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, 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) or 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 process, first, the rotated grindstone 2 is placed 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), 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 the reference numeral Ea and the portion indicated by the 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 pressing force of the grindstone 2 can be made substantially constant by controlling the torque of the motor shaft 5a of the servomotor 5 to be substantially constant, and the processing amount of the end surface E of the glass plate G can be maintained constant in the transport direction.

When the above-mentioned 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 sharply decreases. 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, when the motor shaft 5a of the servomotor 5 rotates counterclockwise and the grindstone 2 is moved in the direction of pressing against the end face E of the glass plate G (of the grindstone 2). When the pressing force is increased) and, although not shown, when the motor shaft 5a of the servomotor 5 rotates clockwise and the grindstone 2 is moved in a direction of pulling away from the end face E of the glass plate G (grinding stone 2). When reducing the pressing force of).

In either case, the servomotor 5 applies a torque to resist the resistance from the urging device 7 in addition to the torque to generate the pressing force of the grindstone 2. Therefore, even when the pressing force of the grindstone 2 with respect to the end surface E of the glass plate G is small, the output of the servomotor 5 can be increased, so that the output of the servomotor 5 is stable. As a result, the pressing force and / or the position of the grindstone 2 is stable, and the processed quality of the end face E of the glass plate G can be maintained well.

Here, it is preferable to adjust the urging force by the urging device 7 so that the output of the servomotor 5 is 10% or more of the rated torque. The output of the servomotor 5 is more preferably 15% or more, and further preferably 20% or more of the rated torque. Further, the urging force of the urging device 7 is preferably adjusted so that the output of the servomotor 5 is 90% or less of the rated torque. The output of the servomotor 5 is more preferably 85% or less of the rated torque, and further preferably 80% or less. Here, the output of the servomotor 5 is the output of the arm member 4 when, for example, the grindstone 2 is in contact with the end face E of the glass plate G, or when the grindstone 2 is not in contact with the end face E of the glass plate G. This is the value when in contact with the stopper that regulates rocking.

(Second Embodiment)
As shown in FIG. 3, the difference between the end face processing device 1 according to the second embodiment and the end face processing device 1 according to the first embodiment is that the urging device 7 replaces the tension spring 7a with a servomotor. A point is that a compression spring 7b for generating an urging force for urging the arm member 4 in a swinging direction by the driving force of 5 is provided.

In the present embodiment, the compression spring 7b generates an urging force so that the grindstone 2 pushes the arm member 4 in the direction away from the end surface E of the glass plate G.

(Third Embodiment)
As shown in FIG. 4, the urging device 7 replaces the

springs

7a and 7b in that the end face processing device 1 according to the third embodiment is different from the end face processing device 1 according to the first and second embodiments. The point is that the cylinder 7c is provided to generate an urging force for urging the arm member 4 in the swinging direction by the driving force of the servomotor 5.

In the present embodiment, the cylinder 7c is configured to generate an urging force so that the grindstone 2 pulls in the arm member 4 in the direction away from the end face E of the glass plate G, but the grindstone 2 is separated from the end face E of the glass plate G. The configuration may be such that an urging force is generated so as to push the arm member 4 in the direction. When the cylinder 7c is used in this way, there is an advantage that the urging force is less likely to fluctuate than the spring even if the swing angle changes due to the swing operation of the arm member 4.

For the cylinder 7c, for example, a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, or the like can be adopted.

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, in the arm member 4, the case where the second joint 6d, the support shaft member 8 and the rotation shaft 2a of the grindstone 2 are arranged on the same straight line has been described, but the center and the support of the second joint 6d have been described. The straight line connecting the center of the shaft member 8 and the straight line connecting the center of the support shaft member 8 and the center of the rotating shaft 2a of the grindstone 2 are not arranged on the same straight line and have an angle of less than 180 °. You may be.

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 urging device 7 urges the arm member in the direction in which the grindstone 2 is separated from the end face E of the glass plate G, but the grindstone 2 is pressed against the end face E of the glass plate G. The arm member may be urged. In this case, in order to counter the torque in the pressing direction by the urging device 7, the servomotor 5 generates a torque in the direction in which the grindstone 2 separates from the end surface E of the glass plate G. More specifically, the servomotor 5 applies a torque obtained by subtracting the torque for generating the pressing force of the grindstone 2 from the torque for resisting the resistance from the urging device 7. Even in this form, if the torque for resisting the resistance from the urging device 7 is appropriately set, even if the pressing force of the grindstone 2 against the end surface E of the glass plate G is small, the servomotor 5 The output of can be increased.

In the above embodiment, the direction in which the urging device 7 is urged substantially coincides with the direction in which the arm member 4 swings, but the grindstone 2 pulls the arm member 4 in a direction away from the end surface E of the glass plate G. If the arm member is pushed in, or if the arm member is pushed in the direction in which the grindstone 2 is pressed against the end surface E of the glass plate G, the urging device 7 is urged in the direction in which the arm member 4 swings. It may be inclined with respect to it.

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

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 Biasing device

7a Tension spring

7b Compression spring 7c Cylinder 8 Support shaft member G Glass plate E End face

Claims

An end face processing device for glass plates that processes the end faces of glass plates with a processing tool.
It is characterized by including a swingable arm member that supports the processing tool, an actuator that generates a driving force for swinging the arm member, and an urging device that urges the arm member. End face processing equipment for glass plates.
The end face processing device for a glass plate according to claim 1, wherein the urging device urges the arm member in a direction in which the processing tool is pulled away from the end surface of the glass plate.
The end face processing device for a glass plate according to claim 1 or 2, wherein the urging device includes a spring that generates a urging force for urging the arm member.
The end face processing device for a glass plate according to claim 1 or 2, wherein the urging device includes a cylinder that generates a urging force for urging the arm member.
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 device includes a swingable arm member that supports the processing tool and an actuator that generates a driving force for swinging the arm member.
A method for manufacturing a glass plate, which comprises urging the arm member in the end face processing step.