CN216098034U

CN216098034U - End face processing device for glass plate

Info

Publication number: CN216098034U
Application number: CN202090000379.5U
Authority: CN
Inventors: 伊吹真澄
Original assignee: Nippon Electric Glass Co Ltd
Current assignee: Nippon Electric Glass Co Ltd
Priority date: 2019-03-29
Filing date: 2020-03-10
Publication date: 2022-03-22
Anticipated expiration: 2030-03-10
Also published as: TWI827819B; KR20210145722A; WO2020203095A1; TW202035064A; JP2020163520A; JP7167816B2

Abstract

The present application relates to an end face processing device (1) for a glass plate, comprising: a swingable arm member (4) that supports the grinding wheel (2); a servo motor (5) that generates a driving force for pressing the grinding wheel (2) against the end face (E) of the glass plate (G); and a link mechanism (6) that transmits the driving force of the servo motor (5) to the arm member (4). The link mechanism (6) is provided with: a first link member (6a) which can swing under the action of a servo motor (5); and a second link member (6b) that is connected to the arm member (4) and the first link member (6a) so as to be able to swing. The end face machining device (1) is configured such that, in a state in which a grinding wheel (2) is in contact with an end face (E) of a glass plate (G), an angle (theta 1) formed by a direction (Ar) orthogonal to the longitudinal direction (A) of a first link member (6a) and the longitudinal direction (B) of a second link member (6B) is smaller than an angle (theta 2) formed by a direction (Cr) orthogonal to the longitudinal direction (C) of an arm member (4) and the longitudinal direction (B) of the second link member (6B).

Description

End face processing device for glass plate

Technical Field

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

Background

In recent years, in response to a demand for improvement in production efficiency of liquid crystal displays and the like, there has been an increasing demand for improvement in production efficiency of glass substrates used for the displays and the like. In the production of glass substrates, there is an operation of cutting one or more glass substrates from a large glass raw plate (forming raw plate). Thereby, a glass substrate having a desired size can be obtained.

On the other hand, since the end surface of the glass substrate cut out from the glass original plate is generally a cut surface or a cut surface, a minute scratch (defect) is often present. Since a scratch or the like occurs on the end surface of the glass substrate due to the scratch, grinding (rough machining) and polishing (finish machining) are performed on the end surface of the glass substrate to prevent the scratch or the like.

As an end face processing apparatus for a glass plate used for this type of end face processing, for example, patent document 1 discloses a so-called constant pressure type end face processing apparatus including: a swingable arm member that supports the processing tool; and an actuator (pressing force generating element) that generates a pressing force that acts on the end surface of the glass plate from the processing tool via the arm member.

Documents of the prior art

Patent document

Patent document 1: international publication No. 2013/187400

Disclosure of Invention

Problem to be solved by utility model

In general, in a constant-pressure type end surface machining apparatus, if the driving force of an actuator is too large, for example, the pressing force of a machining tool is difficult to finely adjust. In particular, in grinding, since the machining capability of the machining tool is generally high, if fine adjustment of the pressing force of the machining tool is insufficient, the machining amount (cutting amount) may be greatly increased or decreased, and desired machining may not be achieved.

The utility model aims to realize fine adjustment of pressing force of a processing tool when processing an end face of a glass plate.

Means for solving the problems

The present invention, which has been made to solve the above problems, relates to an end face processing apparatus for a glass plate, which processes an end face of the glass plate with a processing tool, the apparatus comprising: a swingable arm member that supports the processing tool; an actuator that generates a driving force for pressing the processing tool against the end face of the glass sheet; and a link mechanism that transmits a driving force of the actuator to the arm member, the link mechanism including: a first link member swingable by an actuator; and a second link member which is connected to the arm member and the first link member so as to be capable of swinging, wherein in a state where the processing tool is in contact with the end surface of the glass plate, an angle formed by a direction orthogonal to the longitudinal direction of the first link member and the longitudinal direction of the second link member is smaller than an angle formed by a direction orthogonal to the longitudinal direction of the arm member and the longitudinal direction of the second link member.

In the above-described configuration, when the actuator moves the working tool in the direction of pressing the end face of the glass sheet, the first link member is swung by the actuator, the arm member is pressed by the second link member, and the magnitude of the component of the force acting in the swinging direction of the arm member among the forces acting on the arm member is smaller than the magnitude of the force with which the first link member presses the second link member. Similarly, when the actuator moves the working tool in a direction away from the end surface of the glass sheet, the first link member is swung by the actuator, the arm member is pulled by the second link member, and the magnitude of the force component acting in the swinging direction of the arm member among the forces acting on the arm member is smaller than the magnitude of the force with which the first link member 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 made small, and therefore the pressing force of the processing tool against the end surface of the glass plate can be finely adjusted.

In the above-described structure, the machining tool is preferably a grinding wheel for grinding.

In general, a grinding wheel for grinding is more likely to cause a large variation in machining amount due to a pressing force for pressing an end surface of a glass plate than a grinding wheel for grinding. In contrast, the present invention can finely adjust the pressing force of the processing tool pressing the end face of the glass plate, and can easily control the amount of processing even with the grinding wheel for grinding to a desired amount.

The present invention, which has been made to solve the above problems, relates to a method for manufacturing a glass plate, the method including an end surface processing step of processing an end surface of the glass plate by a processing tool using an end surface processing apparatus, the method including: a swingable arm member that supports the processing tool; an actuator that generates a driving force for pressing the processing tool against the end face of the glass sheet; and a link mechanism that transmits a driving force of the actuator to the arm member, the link mechanism including: a first link member swingable by an actuator; and a second link member which is connected to the arm member and the first link member so as to be capable of swinging, wherein in the end surface processing step, in a state where the processing tool is in contact with the end surface of the glass plate, an angle formed by a direction orthogonal to the longitudinal direction of the first link member and the longitudinal direction of the second link member is smaller than an angle formed by a direction orthogonal to the longitudinal direction of the arm member and the longitudinal direction of the second link member.

In this way, the pressing force of the processing tool against the end face of the glass plate can be finely adjusted in the end face processing step for the same reason as the above-described configuration.

Effect of the utility model

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

Drawings

Fig. 1 is a plan view showing an end surface processing apparatus according to an embodiment of the present invention.

Fig. 2 is an enlarged plan view of a part of the end surface processing apparatus of fig. 1.

Fig. 3 is an enlarged plan view of a part of the end surface processing apparatus of fig. 1.

Fig. 4 is an enlarged plan view of a part of an end surface processing apparatus according to another embodiment of the present invention.

Fig. 5 is an enlarged plan view of a part of an end surface processing apparatus according to another embodiment of the present invention.

Fig. 6 is an enlarged plan view of a part of an end surface processing apparatus according to another embodiment of the present invention.

Detailed Description

The present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1, the end surface processing apparatus 1 includes: a motor 3 for rotating a grinding wheel 2 as a machining tool; an arm member 4 that rotatably supports the grinding wheel 2; a servo motor 5 as an actuator for generating a driving force for pressing the grindstone 2 against the end face E of the glass sheet G; and a link mechanism 6 that transmits the driving force of the servo motor 5 to the arm member 4. Such an end surface processing apparatus 1 is called a constant pressure type.

The motor 3 for rotating the grinding wheel 2 may be a synchronous motor, an induction motor, a servo motor, or the like, but is not limited thereto.

The arm member 4 is rotatably supported by the support shaft member 7 and is swingable about the support shaft member 7. The support shaft member 7 supports the intermediate portion of the arm member 4. One end of the arm member 4 supports the motor 3, and supports the grinding wheel 2 via the motor 3. The other end of the arm member 4 is connected to a link mechanism 6. Although not shown, a stopper for limiting 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 when the grinding wheel 2 comes into contact with the end face E of the glass plate G.

The servo motor 5 for pressing the grinding wheel 2 against the end face E of the glass plate G includes a motor shaft 5a rotatable in the forward and reverse directions and a control unit 5b, and performs feedback control.

The link mechanism 6 includes a first link member 6a and a second link member 6b that are swingable. One end of the first link member 6a is fixed to a motor shaft 5a of the servo motor 5, and the other end of the first link member 6a is connected to one end of the second link member 6b via a first joint 6c so as to be swingable. In other words, the first link member 6a swings centering on the motor shaft 5a by the rotation of the motor shaft 5 a. 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 6 d. In the present embodiment, the center of the second joint 6d, the center of the support shaft member 7, and the center of the rotary shaft 2a of the grinding wheel 2 are aligned on the same straight line.

As shown in fig. 2, when the motor shaft 5a of the servo motor 5 rotates counterclockwise, the arm member 4 also rotates counterclockwise about the support shaft member 7 by the link mechanism 6. The grindstone 2 is moved in the direction of pressing the end face E of the glass sheet G, and the force with which the grindstone 2 presses the end face E of the glass sheet G is increased. 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 arm member 4 also rotates in the clockwise direction around the support shaft member 7 by the link mechanism 6. The grindstone 2 is moved in a direction away from the end face E of the glass sheet G, and the force with which the grindstone 2 presses the end face E of the glass sheet G is reduced.

The control unit 5b monitors the speed, torque, and position of the motor shaft 5a of the servo motor 5 by feedback control. The motor shaft 5a of the servo motor 5 is rotated in the forward and reverse directions in accordance with the speed, torque, and position, and the position and pressing force of the grinding wheel 2 are controlled.

The grinding wheel 2 may be, for example, a grinding wheel mainly for chamfering the end face E, or a grinding wheel mainly for leveling fine irregularities of the end face E. The grain size of the abrasive grains of the grinding wheel is equal to or larger than the grain size of the abrasive grains of the grinding wheel. The abrasive grains of the grinding wheel for grinding may have a grain size of #100 to #1000, for example, and the abrasive grains of the grinding wheel for grinding may have a grain size of #200 to #1000, for example. The diameter of the grinding wheel 2 may be, for example, 100 to 200 mm.

As shown in fig. 1, in the present embodiment, two end face processing apparatuses 1 are disposed at positions facing each other with a glass sheet G interposed therebetween. That is, the end faces E of the two opposing sides of the glass sheet G are simultaneously end-processed. A plurality of end face processing apparatuses 1 may be disposed on one side of the glass sheet G. In this case, the types of the grindstones 2 of the end surface machining apparatuses 1 may be the same or different. For example, the grinding wheel 2 of the end surface processing apparatus 1 on the upstream side of the previously processed end surface E may be used as a grinding wheel, and the grinding wheel 2 of the end surface processing apparatus 1 on the downstream side of the subsequently processed end surface E may be used as a grinding wheel.

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

The glass sheet G can be relatively moved in a predetermined feed direction X with respect to the grinding wheel 2. Fig. 1 shows a case where the glass sheet G is moved in the feeding direction X and the grinding wheel 2 is fixed. Of course, the glass sheet G may be fixed and the grindstone 2 may be moved in the direction opposite to the feeding direction X, or both the glass sheet G and the grindstone 2 may be moved.

Next, a method for manufacturing a glass plate using the end surface processing apparatus 1 having the above-described configuration will be described.

The manufacturing method according to the present embodiment includes: a preparation step of preparing a glass plate G; and an end face processing step of processing the end face E of the prepared glass sheet G. The end face processing step may be followed by steps such as cleaning, inspection, and packaging of the glass sheet G. The end face processing step may be performed separately.

In the preparation step, a forming blank is first obtained by a known forming method. Thereafter, the formed blank plate is cut into a predetermined size, thereby obtaining a glass plate G to be processed by the end face processing apparatus 1. For example, a down-draw method such as an overflow down-draw method, a slit down-draw method, or a redraw method, and a float method can be used as the forming method. Among them, the overflow downdraw method is preferable because the surfaces on both sides can be forged surfaces to realize high surface quality. 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 machining step, the grinding wheel 2 in a rotating state is first arranged at a predetermined position by rotation of the servo motor 5. In this state, the glass sheet G is conveyed in the feed direction X so that the grindstone 2 comes into contact with the end face E of the glass sheet G. At the start of the machining (when machining the portion indicated by reference sign Ea in fig. 1), the grinding wheel 2 tries to separate from the glass plate G due to the impact generated by the contact between the grinding wheel 2 and the end face E of the glass plate G. To cope with this, the control unit 5b performs feedback control (for example, 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 that moves together with the grinding wheel 2 based on the speed of the motor shaft 5a of the servo motor 5. In response to 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 separate from the end face E of the glass plate G. Therefore, the grinding wheel 2 can be prevented from jumping at the start of machining.

Further, even in the processing of the middle portion (the portion between the portion shown by Ea and the portion shown by Eb) in the conveyance direction in the end face E of the glass sheet G, feedback control of the speed and torque of the motor shaft 5a of the servo motor 5 is performed. At this time, the ratio of the speed control and the torque control is changed to increase the ratio of the torque control. The ratio can be changed by changing the gain setting. Thus, the processing amount of the end face E of the glass sheet G can be maintained constant in the conveyance direction.

When the end surface processing is completed, the contact between the grindstone 2 and the end surface E of the glass plate G is released, and the torque of the motor shaft 5a of the servo motor 5 is rapidly reduced. Therefore, at the end of the machining (at the time of machining the portion indicated by the reference numeral Eb), the control section 5b performs feedback control of the speed and torque of the motor shaft 5a of the servo motor 5 so as to keep the position of the grinding wheel 2 constant. The above-described control method by the control unit 5b is an example, and is not limited to this.

As shown in fig. 2 and 3, in the end face machining step, the motor shaft 5a of the servo motor 5 rotates counterclockwise to move the grindstone 2 in a direction to press the end face E of the glass plate G, and the motor shaft 5a of the servo motor 5 rotates clockwise to move the grindstone 2 in a direction to separate from the end face E of the glass plate G.

If θ 1 is an angle formed by the orthogonal direction Ar of the longitudinal direction a of the first link member 6a of the first joint 6C and the longitudinal direction B of the second link member 6B, and θ 2 is an angle formed by the orthogonal direction Cr of the longitudinal direction C of the arm member 4 of the second joint 6d and the longitudinal direction B of the second link member 6B, a relationship of θ 1 < o2 is established. The angular relationship between θ 1 and o2 is always satisfied from the start of processing to the end of processing of the end face E of the glass sheet G.

Here, θ 1 and θ 2 mean angles in a state where the grinding wheel 2 is in contact with the end face E of the glass plate G to be processed. The longitudinal direction a of the first link member 6a means a direction of a 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, the longitudinal direction B of the second link member 6B means a 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 means a direction of a straight line connecting the center of the second joint 6d and the center of the support shaft member 7 (the swing center of the arm member 4).

As shown in fig. 2, when the grinding wheel 2 moves in the pressing direction, a force F1 by which the first link member 6a presses the second link member 6b (strictly speaking, a force by which the first joint 6c is pressed) is parallel to the direction Ar orthogonal to the longitudinal direction a of the first link member 6 a. On the other hand, of the forces acting on the arm member 4 pressed by the second link member 6b (strictly speaking, the forces acting on the second joint 6 d), the force F2 for swinging the arm member 4 counterclockwise is parallel to the direction Cr orthogonal to the longitudinal direction C of the arm member 4. Therefore, the relationship of F2 ═ F1cos θ 2/cos θ 1 holds, and since θ 1 is smaller than θ 2, F2 is also smaller than F1.

Similarly, as shown in fig. 3, when the grinding wheel 2 moves in the separating direction, a force F3 by which the first link member 6a pulls the second link member 6b (strictly speaking, a force by which the first joint 6c is pulled) is a direction (a direction opposite to F1) parallel to the orthogonal direction Ar in the longitudinal direction a of the first link member 6 a. On the other hand, of the forces acting on the arm member 4 pulled by the second link member 6b (strictly speaking, the forces acting on the second joint 6 d), the force F4 that swings the arm member 4 clockwise is a direction parallel to the direction Cr orthogonal to the longitudinal direction C of the arm member 4 (a direction opposite to F2). Therefore, the relationship of F4 ═ F3cos θ 2/cos θ 1 holds, and since θ 1 is smaller than θ 2, 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, and the pressing force with which the grinding wheel 2 presses the end face E of the glass plate G can be finely adjusted.

θ 2 may be an angle higher than 0 °, and θ 1 may be, for example, 0 ° or more. Although increasing θ 2 — θ 1 enables finer adjustment of the pressing force, the maximum pressing force is also reduced. From the viewpoint of both, θ 2 — θ 1 is preferably 5 to 85 °, more preferably 15 to 75 °, and most preferably 25 to 65 °, for example. Preferably cos θ 2/cos θ 1 is, for example, 0.2 to 0.98, and more preferably 0.4 to 0.96, and most preferably 0.6 to 0.94.

The sizes of θ 1 and θ 2 can be adjusted by, for example, changing the longitudinal dimensions of the arm member 4, the first link member 6a, and the second link member 6b, and the attachment positions of the motor shaft 5a and the support shaft member 7 of the servo motor 5.

Although the embodiments of the present invention have been described above, the end surface processing apparatus and the manufacturing method of a glass plate according to the present invention are not limited to the embodiments, and various embodiments can be adopted within the scope of the present invention.

In the above-described embodiment, the case where the second joint 6d of the arm member 4, the support shaft member 7, and the rotation shaft 2a of the grinding wheel 2 are aligned on the same straight line has been described, but the arm member 4 may be shaped such that a straight line connecting the center of the second joint 6d and the center of the support shaft member 7 and a straight line connecting the center of the support shaft member 7 and the center of the rotation shaft 2a of the grinding wheel 2 are not aligned on the same straight line and form an angle smaller than 180 °. However, even in this case, the longitudinal direction C of the arm member 4 is defined as a 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-described embodiment, the grinding wheel 2 is exemplified as the machining tool, but the machining tool may be a tool other than the grinding wheel as long as it can machine the end face E of the glass sheet G.

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

In the above-described embodiment, the following cases are exemplified in fig. 2 and 3: the orthogonal direction Ar of the longitudinal direction a of the first link member 6a has an angle of counterclockwise rotation θ 1 from the longitudinal direction B of the second link member 6B, and the orthogonal direction Cr of the longitudinal direction C of the arm member 4 has an angle of clockwise rotation θ 2 from the longitudinal direction B of the second link member 6B, but the directions of θ 1 and θ 2 with respect to the longitudinal direction B of the second link member 6B are not particularly limited.

In other words, as shown in fig. 4, the direction Cr orthogonal to the longitudinal direction C of the arm member 4 may have an angle of rotation θ 2 counterclockwise from the longitudinal direction B of the second link member 6B (the direction of θ 2 is opposite).

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 rotation θ 1 clockwise from the longitudinal direction B of the second link member 6B (the direction of θ 1 is opposite).

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 clockwise rotation θ 1 from the longitudinal direction B of the second link member 6B, and the orthogonal direction Cr of the longitudinal direction C of the arm member 4 may have an angle of counterclockwise rotation θ 2 from the longitudinal direction B of the second link member 6B (the directions of θ 1 and θ 2 are opposite).

Description of reference numerals:

1 end face machining device

2 grinding wheel (processing tool)

3 electric machine

4-arm member

5 Servo-actuator (actuator)

5a motor shaft

5b control part

6-bar linkage

6a first Link Member

6b second Link Member

6c first joint

6d second joint

7 bearing shaft member

G glass plate

E end face.

Claims

1. An end face processing device for a glass plate, which is a device for processing an end face of a glass plate by a processing tool,

the glass plate end surface processing device is provided with:

a swingable arm member that supports the processing tool;

an actuator that generates a driving force for pressing the processing tool against the end face 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 swingable by the actuator; and

a second link member connected to the arm member and the first link member so as to be capable of swinging,

in a state where the processing tool is in contact with the end surface of the glass plate, an angle formed by a direction orthogonal to the longitudinal direction of the first link member and a direction orthogonal to the longitudinal direction of the second link member is smaller than an angle formed by a direction orthogonal to the longitudinal direction of the arm member and a direction orthogonal to the longitudinal direction of the second link member.

2. An end face processing apparatus for glass plate according to claim 1,

the processing tool is a grinding wheel for grinding.