KR20210143167A - Glass plate end surface processing apparatus and glass plate manufacturing method - Google Patents

Abstract

The end surface processing apparatus 1 of the glass plate which processes the end surface E of the glass plate G into a grindstone 2 is a rockable arm member 4 supporting the grindstone 2, and the arm member 4 is oscillating A servo motor (5) for generating a driving force for this purpose, and a biasing device (7) for biasing the arm member (4) are provided.

Description

Glass plate end surface processing apparatus and glass plate manufacturing method

This invention relates to the manufacturing method of the end surface processing apparatus of a glass plate, and a glass plate.

In recent years, in order to comply with a request for improvement in production efficiency of liquid crystal displays and the like, there is an increasing demand for improvement in the production efficiency of glass substrates used for displays and the like. Here, in manufacture of a glass substrate, cutting out 1 sheet or a plurality of glass substrates from a large sized glass original plate (molding original plate) is performed. Thereby, the glass substrate of a desired dimension can be acquired.

On the other hand, since the end surface of the glass substrate cut out from a glass original plate becomes a cut surface or a breaking surface normally, a micro-wound (defect) exists in many cases. If there is a scratch on the end surface of the glass substrate, a crack or the like is generated from the scratch. In order to prevent this, grinding processing (rough processing) and polishing processing (finishing processing) are performed on the end surface of the glass substrate.

As an end surface processing apparatus of a glass plate used for this type of end surface processing, for example, Patent Document 1 discloses a swingable arm member for supporting a processing tool, and a pressing force applied from the processing tool to the end surface of the glass plate through the arm member. Disclosed is an end face processing apparatus, which is called a static pressure type, provided with an actuator (a pressing force generating element) that generates

International Publication No. 2013/187400

In general, in a static pressure type end surface processing apparatus, when it is necessary to reduce the pressing force of the processing tool, the output (driving force) of the actuator also inevitably decreases. However, if the output of the actuator is too small compared to the rated output, there is a problem that it is not stable. As a result, there exists a possibility that the pressing force and/or the position of a processing tool may continue fluctuate|varies unjustly, and the processing quality of the end surface of a glass plate may fall.

Even if this invention is a case where the pressing force of the processing tool with respect to the end surface of a glass plate is small, it makes it a subject to maintain the processing quality of the end surface of a glass plate favorably.

The present invention, devised to solve the above problems, is a device for processing the end surface of a glass plate for processing the end surface of the glass plate into a processing tool. and a biasing device for biasing the female member.

In this way, even when the pressing force of the processing tool with respect to the end surface of the glass plate is small, the driving force of the actuator (for example, a servo motor, etc.) is increased in order to eliminate the biasing force of the biasing device, so that the output of the actuator is stabilized. Therefore, the pressing force and/or the position of a processing tool can be stabilized, and the processing quality of the end surface of a glass plate can be maintained favorably.

Said structure WHEREIN: It is preferable that the biasing apparatus biases the arm member in the direction which separates a processing tool from the end surface of a glass plate.

In this way, when an actuator stops, since a processing tool is automatically separated from the end surface of a glass plate by the biasing force of a biasing apparatus, the breakage of a glass plate can be prevented.

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

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

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

In this way, even if the cylinder expands and contracts, the biasing force does not change easily, so that the biasing force of the arm member can be easily made constant.

In the above configuration, as a method for manufacturing a glass plate provided with an end surface processing step of processing the end surface of the glass plate into a processing tool by an end surface processing device, the end surface processing device includes a swingable arm member supporting the processing tool, and the arm member swings It is characterized in that it has an actuator that generates a driving force for doing so, and biases the arm member in the end surface machining process.

In this way, in an end surface processing process, since the output of an actuator is stabilized for the same reason mentioned above, the processing quality of the end surface of a glass plate can be maintained favorably.

ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where the pressing force of the processing tool with respect to the end surface of a glass plate is small, the processing quality of the end surface of a glass plate can be maintained favorably.

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

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings. In addition, in 2nd Embodiment and after, the structure common to other embodiment attaches|subjects the same code|symbol, and abbreviate|omits detailed description.

(First embodiment)

As shown in Fig. 1, an end surface processing apparatus 1 according to the first embodiment includes a motor 3 for rotationally driving a grindstone 2 as a processing tool, and an arm member ( 4) and a servo motor 5 as an actuator that generates a driving force for swinging the arm member 4 (for the grinding stone 2 to press the end surface E of the glass plate G), and a servo motor 5 ) a link mechanism (6) for transmitting the driving force to the arm member (4), and a biasing device (7) for biasing the arm member (4).

Although a synchronous motor, an induction motor, a servo motor, etc. can be used for the motor 3 which rotationally drives the grindstone 2, it is not limited to this.

The arm member 4 is rotatably supported by the support shaft member 8 and is oscillating around the support shaft member 8 . The direction in which the female member 4 swings includes a direction in which the grindstone 2 is separated from the end face E of the glass plate G, and a direction in which the grindstone 2 is pressed against the end face E of the glass plate G. . The support shaft member 8 supports the middle part of the arm member 4 . One end of the female member 4 supports the motor 3 , and the grindstone 2 is supported via the motor 3 . The other end of the female member 4 is connected to the link mechanism 6 . In addition, although not shown in figure, the stopper which restricts the rocking|fluctuation range of the arm member 4 is provided on the rocking|fluctuation trajectory of the arm member 4 . The stopper is retractable from the arm member 4 while the grindstone 2 is in contact with the end surface E of the glass plate G.

A servomotor 5 that generates a driving force for swinging the arm member 4 includes a motor shaft 5a rotatable in a forward and reverse direction, and a control unit 5b, and feedback control is performed.

The link mechanism 6 is provided with the 1st link member 6a and the 2nd link member 6b respectively so that it can rock|fluctuate. In the present embodiment, 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 interposed with a first joint 6c to the second link member 6b. It is oscillatingly connected to one end of the That is, the 1st link member 6a swings centering on the motor shaft 5a by rotation of the motor shaft 5a. The other end of the second link member 6b is pivotably connected to the other end of the female member 4 via a second joint 6d. In this embodiment, the center of the 2nd joint 6d, the center of the support shaft member 8, and the center of the rotating shaft 2a of the grindstone 2 are arranged on the same straight line. In addition, the servomotor 5 and the arm member 4 may be directly connected, and the link mechanism 6 may be abbreviate|omitted.

The biasing device 7 includes a tension spring 7a for generating a biasing force biasing the arm member 4 in a swinging direction by the driving force of the servo motor 5 . The tension spring 7a has one end attached to the receiving portion 4a of the female member 4 and the other end attached to the base portion 9 or the like of the end face processing apparatus 1 . In this embodiment, the tension spring 7a is drawing in the arm member 4 in the direction in which the grindstone 2 falls from the end surface E of the glass plate G. As shown in FIG. That is, the tension spring 7a gives resistance to the swinging operation when the arm member 4 swings so as to move in the direction in which the grindstone 2 is pressed against the end face E of the glass plate G. As shown in FIG.

The attachment position (connection position) of the tension spring 7a to the arm member 4 is not particularly limited, but in the present embodiment, the central position between the support shaft member 8 and the rotation shaft 2a of the grindstone 2 is higher than that of the center position. It is set at a position near the support shaft member 8 . The reason that the attachment 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 in response to the swing of the arm member 4 is reduced, so that the biasing force of the tension spring 7a is reduced. in order to reduce the fluctuation of Further, the attachment position of the tension spring 7a to the arm member 4 is closer to the support shaft member 8 than the central position between the support shaft member 8 and the second joint 6d. A similar effect is obtained even in a nearby position.

As shown in FIG. 2 , when the motor shaft 5a of the servo motor 5 rotates in the counterclockwise direction, the arm member 4 also rotates in the counterclockwise direction centering on the support shaft member 8 by the link mechanism 6 . rotate to Thereby, the force with which the grindstone 2 moves to the direction pressed with respect to the end surface E of the glass plate G, and the grindstone 2 presses the end surface E of the glass plate G increases. On the other hand, when the motor shaft 5a of the servo motor 5 rotates clockwise contrary to FIG. 2 , the arm member 4 also rotates clockwise around the support shaft member 8 by the link mechanism 6 . . Thereby, the force with which the grindstone 2 moves in the direction to be separated with respect to the end surface E of the glass plate G, and 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 by feedback control. The position and pressing force of the grindstone 2 are controlled by rotating the motor shaft 5a of the servo motor 5 in the forward and reverse directions according to this speed, torque, and position.

The whetstone 2 may be, for example, a grinding wheel whose main purpose is chamfering the end surface E, or may be a grinding stone whose main purpose is to even out the minute irregularities of the end surface E. The grain size of the abrasive grains in the grinding stone is equal to or larger than the grain size of the abrasive grains in the grinding stone. The grain size of the abrasive grains in the grinding stone can be, for example, #100 to #1000, and the grain size of the abrasive grains in the grinding stone can be, for example, #200 to #1000. The diameter of the grindstone 2 is 100-200 mm, for example.

As shown in FIG. 1, in this embodiment, the two end surface processing apparatus 1 is arrange|positioned at the position which opposes across the glass plate G. That is, the end surface E of two opposite sides of the glass plate G is each simultaneously processed by the end surface. Moreover, you may arrange|position the some end surface processing apparatus 1 in one side of glass plate G. In this case, the kind of the grindstone 2 of each end surface processing apparatus 1 may be the same, and may differ. For example, the whetstone 2 of the upstream end face processing device 1 which processes the end face E first is used as a grindstone for grinding, and the downstream end face which follows this and processes the end face E from the rear. It is good also considering the grindstone 2 of the processing apparatus 1 as a grindstone for grinding|polishing.

The glass plate G used as the process object of the end surface processing apparatus 1 has a rectangular plate shape, for example. It is preferable that they are 0.05 mm - 10 mm, and, as for the thickness dimension of glass plate G, it is more preferable that they are 0.2 mm - 0.7 mm, for example. Of course, the glass plate G to which this invention is applicable is not limited to the said form. For example, this invention is applicable also to the glass plate which has a shape (for example, polygon) other than a rectangle, and the glass plate of the size which thickness dimension deviates from 0.05 mm - 10 mm.

The glass plate (G) can move relatively along a predetermined transfer direction (X) with respect to the grindstone (2). In addition, in FIG. 1, the glass plate G moves to the conveyance direction X, and the case where the grindstone 2 is fixed is shown. Of course, the glass plate G is fixed, and the grindstone 2 may move in the direction opposite to the conveyance direction X, and both of the glass plate G and the grindstone 2 may move.

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

The manufacturing method by this embodiment is equipped with the preparatory process of preparing glass plate G, and the end surface processing process of processing the end surface E of prepared glass plate G. Moreover, you may perform processes, such as washing|cleaning of glass plate G, a test|inspection, packing, after an end surface processing process. The end surface processing process can be performed independently.

In a preparatory process, a shaping|molding original board is obtained by a well-known shaping|molding method first. Then, the glass plate G used as the process object of the end surface processing apparatus 1 is obtained by cutting out the shaping|molding original board to a predetermined dimension. As a shaping|molding method, down-draw methods, such as an overflow down-draw method, a slot down-draw method, a re-draw method, and a float method can be used, for example. Among them, the overflow down-draw method is preferable because the surfaces of both sides are forged and high surface quality can be realized. Glass plate G is used for glass substrates for flat panel displays, such as a liquid crystal display, for example.

In the end surface processing step, the grinding stone 2 in a rotated state is first arranged at a predetermined position by the rotation of the servo motor 5 . In this state, the glass plate G is conveyed along the conveyance direction X, and the grindstone 2 is made to contact the end surface E of the glass plate G. At the time of this process start (at the time of processing of the part shown by the code|symbol Ea), the grindstone 2 is going to fall from the glass plate G by the impact accompanying the contact of the edge surface E of the grindstone 2 and glass plate G. In order to cope with this, the control unit 5b performs feedback control (eg, PID control) of the speed and torque of the motor shaft 5a of the servo motor 5 . Specifically, the control unit 5b detects the movement of the arm member 4 moving together with the grindstone 2 based on the speed of the motor shaft 5a of the servo motor 5 . In accordance with 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 may not fall from the end surface E of the glass plate G. Therefore, the bounding of the grindstone 2 at the time of a process start can be prevented.

Moreover, also in the processing of the intermediate part (the part shown by the part shown by the code|symbol Ea and the part shown by the code|symbol Eb) of the intermediate part of a conveyance direction among the end surface E of the glass plate G, the speed of the motor shaft 5a of the servomotor 5 and Torque feedback control. In that case, the ratio of speed control and torque control is changed, and the ratio of torque control is made high. This ratio can be changed by changing the gain setting. Thereby, by controlling the torque of the motor shaft 5a of the servomotor 5 to be substantially constant, the pressing force of the grindstone 2 can be made substantially constant, and the processing amount of the end surface E of the glass plate G can be kept constant in the conveying direction.

When the end surface processing is finished, the contact between the grinding stone 2 and the end surface E of the glass plate G is released, so that the torque of the motor shaft 5a of the servo motor 5 is sharply reduced. Therefore, at the end of the machining (when machining the part indicated by the symbol Eb), the control unit 5b controls the speed and torque of the motor shaft 5a of the servomotor 5 so that the position of the grindstone 2 becomes constant. do In addition, said control method by the control part 5b is an example, and is not limited to this.

As shown in FIG. 2, in an end surface processing process, the motor shaft 5a of the servo motor 5 rotates counterclockwise, and in the direction which presses the grindstone 2 with respect to the end surface E of the glass plate G. In the case of moving (increasing the pressing force of the grindstone 2) and, although not shown, the motor shaft 5a of the servo motor 5 rotates clockwise, and the grindstone 2 moves the glass plate G. There is a case where it is moved in the direction of separation with respect to the end face E (when the pressing force of the grindstone 2 is reduced).

In either case, the servo motor 5 applies a torque to withstand the resistance from the biasing device 7 in addition to the torque for generating the pressing force of the grindstone 2 . Therefore, even if it is a case where the pressing force of the grindstone 2 with respect to the end surface E of the glass plate G is small, since the output of the servomotor 5 can be enlarged, the output of the servomotor 5 is stabilized. As a result, the pressing force and/or the position of the grindstone 2 are stabilized, and the processing quality of the end surface E of the glass plate G can be maintained favorably.

Here, the biasing force by the biasing device 7 is preferably adjusted so that the output of the servo motor 5 is 10% or more of the rated torque. The output of the servo motor 5 is more preferably 15% or more of the rated torque, and still more preferably 20% or more. In addition, it is preferable to adjust the biasing force by the biasing device 7 so that the output of the servo motor 5 may be 90% or less of the rated torque. The output of the servo motor 5 is more preferably 85% or less of the rated torque, and still more preferably 80% or less. Here, the output of the servomotor 5 is, for example, when the grindstone 2 is in contact with the end face E of the glass plate G, or the grindstone 2 is the end face E of the glass plate G and It is a value when the arm member 4 is in contact with the stopper which regulates the rocking|fluctuation in a non-contact state.

(Second Embodiment)

As shown in Fig. 3, the end face machining device 1 according to the second embodiment is different from the end face machining device 1 according to the first embodiment in that the biasing device 7 is replaced with the tension spring 7a. The point is to include a compression spring 7b for generating a biasing force biasing the arm member 4 in a swinging direction by the driving force of the servo motor 5 .

In this embodiment, the compression spring 7b generates a biasing force so that the grindstone 2 may press-fit the female member 4 in the direction away from the end surface E of the glass plate G. As shown in FIG.

(Third embodiment)

As shown in Fig. 4, the end face machining device 1 according to the third embodiment is different from the end face machining device 1 according to the first and second embodiments in that the biasing device 7 has a spring 7a, 7b) Instead, a cylinder 7c is provided for generating a biasing force biasing the arm member 4 in a swinging direction by the driving force of the servo motor 5 .

In this embodiment, the cylinder 7c is configured to generate a biasing force so that the grinding stone 2 draws in the female member 4 in a direction away from the end surface E of the glass plate G, but the grinding stone 2 is a glass plate ( A configuration in which a biasing force is generated so as to press-fit the female member 4 in a direction away from the end face E of G) may be employed. When the cylinder 7c is used in this way, there is an advantage in that the biasing force is less variable compared to the spring even if the swing angle is changed by the swing operation of the arm member 4 .

As the cylinder 7c, a pneumatic cylinder, a hydraulic cylinder, an electric cylinder, etc. can be employ|adopted, for example.

As mentioned above, although embodiment of this invention was described, of course, the end surface processing apparatus and manufacturing method of the glass plate by this invention are not limited to this form, It is possible to take various forms within the scope of this invention.

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. The straight line connecting the center of the joint 6d and the center of the support shaft member 8 and the straight line connecting the center of the support shaft member 8 and the center of the rotation shaft 2a of the grindstone 2 are on the same straight line You may have an angle formed by less than 180 degrees without being arranged.

In said embodiment, although the grindstone 2 was illustrated as a processing tool, as long as a processing tool can process the end surface E of glass plate G, other than a grindstone may be sufficient.

In the above embodiment, the biasing device 7 biases the female 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 the end face of the glass plate G ( The arm member may be biased in a direction pressed against E). In this case, in order to counteract the torque in the pressing direction by the biasing device 7 , the servo motor 5 generates a torque in the direction in which the grindstone 2 is separated from the end surface E of the glass plate G. More specifically, the servo motor 5 applies a torque obtained by subtracting the torque for generating the pressing force of the grindstone 2 from the torque for withstanding the resistance from the biasing device 7 . Even in this form, if the torque for withstanding the resistance from the biasing device 7 is appropriately set, the output of the servo motor 5 even when the pressing force of the grindstone 2 with respect to the end surface E of the glass plate G is small. can be made large.

In the present embodiment described above, the biasing direction of the biasing device 7 substantially coincides with the swinging direction of the female member 4, but in the direction in which the grindstone 2 is separated from the end face E of the glass plate G. When the female member 4 is retracted, or when the whetstone 2 is pressed against the end surface E of the glass plate G, the female member is press-fitted, the biasing device 7 biases the female member 4 ) may be inclined with respect to the swinging direction.

Although the servomotor 5 which has the motor shaft 5a was illustrated as an actuator in the said embodiment, the actuator may be a well-known actuator other than a servomotor, such as a pneumatic actuator, a hydraulic actuator, and an electromechanical actuator.

1 Ending device 2 Grinding stone (tool)
3 Motor 4 Female member
5 Servo motor (actuator) 5a Motor shaft
5b control unit 6 link mechanism
6a first link member 6b second link member
6c 1st joint 6d 2nd joint
7 Biasing device 7a Tension spring
7b compression spring 7c cylinder
8 Support shaft member G Glass plate
E end face

Claims (5)

As an end surface processing device for processing the end surface of the glass plate into a processing tool,
An end surface processing apparatus for a glass plate, comprising: an arm member capable of swinging for supporting the processing tool; an actuator generating a driving force for swinging the arm member; and a biasing device for biasing the arm member. The method of claim 1,
The said biasing apparatus is biasing the said arm member in the direction which removes the said processing tool from the end surface of the said glass plate, The end surface processing apparatus of the glass plate characterized by the above-mentioned. 3. The method according to claim 1 or 2,
The said biasing device is provided with the spring which generate|occur|produces the biasing force for biasing the said arm member, The end surface processing apparatus of the glass plate characterized by the above-mentioned. 3. The method according to claim 1 or 2,
The said biasing device is provided with the cylinder which generate|occur|produces the biasing force for biasing the said arm member, The end surface processing apparatus of the glass plate characterized by the above-mentioned. As a manufacturing method of a glass plate provided with the end surface processing process of processing the end surface of a glass plate into a processing tool by an end surface processing apparatus,
The end surface processing apparatus includes a swingable arm member for supporting the processing tool, and an actuator for generating a driving force for swinging the arm member,
In the end surface processing step, the manufacturing method of the glass plate, characterized in that the biasing of the arm member.

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