WO2019187873A1

WO2019187873A1 - Sheet glass production method

Info

Publication number: WO2019187873A1
Application number: PCT/JP2019/007046
Authority: WO
Inventors: 愛信星野; 隼人奥; 晃粟津; 久博竹内
Original assignee: 日本電気硝子株式会社
Priority date: 2018-03-29
Filing date: 2019-02-25
Publication date: 2019-10-03
Also published as: KR102638516B1; CN111542414A; TW201942083A; JP2019171536A; TWI785219B; JP6973237B2; CN111542414B; KR20200138144A

Abstract

The end-face processing step of this method comprises a position control step for controlling, by means of a control device 5, the position of a processing tool 2. The position control step includes: a preparation step S1 for placing the processing tool 2 at a reference position RP before the processing tool 2 is brought into contact with an end surface ES prior to the initiation of processing; a measurement step S2 for measuring the amount of displacement D of the processing tool 2 in an approaching direction CDa, or in a separation direction CDb, as the processing tool 2 is brought into contact with the end surface ES when initiating the processing; and a correction step S4 for setting, on the basis of the displacement amount D, the reference position RP of the processing tool 2 for the next round of processing.

Description

Sheet glass manufacturing method

The present invention relates to a method for manufacturing plate glass, which includes a step of processing an end face of the plate glass.

In recent years, in order to meet demands for improving the manufacturing efficiency and increasing the size of liquid crystal displays, organic EL displays, etc., the size of the plate glass used therein tends to increase. If the size of the plate glass is increased, the number of glass substrates that can be taken from one plate glass increases, and it becomes possible to efficiently manufacture a glass substrate corresponding to a large display. Further, in order to increase the processing quantity per hour and lower the manufacturing cost, increasing the processing speed (processing speed) of the plate glass is being studied.

If there is a scratch on the end surface of the plate glass, a crack or the like is generated from the scratch. Therefore, the end surface of the plate glass is ground and polished to prevent this. Plate glass end face processing apparatuses include a constant pressure type that keeps the pressing force of a processing tool constant, and a fixed type that performs processing by fixing the processing tool. In order to process the shape of the plate glass cut in the upstream process so that the end surface of the plate glass becomes uniform using a fixed end surface processing device, the grinding and polishing allowance of the plate glass must be set large. Therefore, the processing time becomes long, and it is difficult to further increase the conveyance speed (processing speed) of the plate glass.

As a technique for processing the end surface of the plate glass with a constant pressure type, Patent Document 1 includes a processing tool for processing the end surface of the plate glass, and a pressing force generating element that urges the processing tool toward the end surface of the plate glass to generate a pressing force, Disclosed is a plate glass processing apparatus including a measuring unit that measures the position of a processing tool. The processing tool includes a grindstone and an arm member that supports the grindstone. The pressing force generating element applies a couple of force to the arm member of the processing tool, and urges the processing tool against the end surface of the plate glass to generate a pressing force. The plate glass processing apparatus processes the end face of the plate glass at high speed and with high accuracy by controlling the pressing force generating element so that the pressing force is constant.

This plate glass processing apparatus controls the processing tool to move to a reference position as an initial position at the start of processing and a standby position where the processing tool is separated from the plate glass and waits after processing. At the start of processing, the plate glass processing apparatus moves the processing tool from the standby position to the reference position and starts controlling the pressing force by the pressing force generating element. At this time, when the processing tool is separated from the plate glass, the pressing force generating element moves the processing tool so as to contact the end surface of the plate glass.

A grindstone is used as a processing tool for processing an end face of a plate glass, and the grindstone has a groove portion for receiving the end portion of the plate glass.

JP 2014-161981 A

¡As a plurality of plate glasses are processed, the groove portion of the processing tool gradually wears and its depth increases. In order to cope with the wear of the groove portion of the processing tool, it is conceivable to change the reference position for each sheet glass, for example, to correct by moving the reference position by a certain distance in the direction approaching the end surface of the sheet glass. However, since the degree of wear of the groove portion of the processing tool varies, the correction (movement) of the reference position may be insufficient or excessive. When the correction of the reference position is insufficient, the processing tool needs to move from the reference position in a direction approaching the end surface of the plate glass at the start of processing. If the amount of movement of the processing tool increases, the processing tool comes into contact with the end surface of the plate glass in a state where the pressing force is insufficient in the initial stage of processing, which may cause a problem that part of the end surface of the plate glass is unprocessed or processing is insufficient. There is. Further, when the correction of the reference position is excessive, the processing tool contacts the plate glass with an excessive pressing force at the start of processing and moves in a direction away from the end surface of the plate glass. If the amount of movement of the processing tool increases, there is a risk of causing a problem such as burning of the groove due to an impact at the time of contact.

The present invention has been made in view of the above circumstances, and in the case of processing the end face of a plate glass with a constant pressure type processing tool, the production of a plate glass capable of suitably controlling the position of the processing tool at the start of processing. It aims to provide a method.

The present invention is for solving the above-described problems, and in the method for manufacturing a sheet glass including an end surface processing step for processing the end surface of the sheet glass with the processing tool, the processing tool is in an approaching direction or a separation direction with respect to the end surface. And a constant pressure type processing tool that contacts the end face at a constant pressure, and the end face processing step includes a position control step for controlling the position of the processing tool by a control device, The position control step includes a preparation step of placing the processing tool at a reference position before starting the processing and before the processing tool contacts the end surface, and the processing tool on the end surface when starting the processing. A measuring step for measuring the movement amount of the processing tool in the approaching direction or the separation direction when contacting, and a correction for setting the reference position of the processing tool related to the next processing based on the movement amount Characterized in that it comprises a degree, the.

As described above, the processing tool is set to the reference position under the control of the control device in the preparation process. The reference position is a position in the cutting direction of the processing tool at the start of processing in the end surface processing step. For example, the reference position is set (adjusted) so that the end surface of the plate glass can be processed with a desired pressure. In the present invention, the reference position is also used as an initial position for measuring the position of the processing tool in the cutting direction.

At the start of machining, depending on the degree of wear of the groove, the working tool moves from the reference position in the direction approaching the glass sheet (approaching direction) or in the separation direction opposite to the approaching direction. In the present invention, the movement amount is measured by the control device in the measurement process, and the reference position for the next processing is set based on the movement amount in the correction process. As a result, the reference position, which is the initial position of the processing tool at the start of processing, can be suitably controlled in accordance with the change in the positional relationship between the processing tool and the glass sheet due to the influence of wear on the processing tool. For this reason, while preventing the process defect with respect to the end surface of plate glass, it can prolong the lifetime of a processing tool.

In the present invention, “the amount of movement when the processing tool comes into contact with the end face of the glass sheet” means the approaching or separating direction from the reference position until the processing tool comes into contact with the end face of the glass sheet with a desired pressure. It means the distance moved.

The position control step further includes a determination step of determining whether or not the movement amount exceeds a threshold value, and the correction step is executed when it is determined in the determination step that the movement amount exceeds the threshold value. May be. In this way, by setting the threshold value for the movement amount, it is possible to absorb the variation in the movement amount due to the alignment positioning accuracy. Therefore, even when the alignment positioning accuracy is low, the reference position that is the initial position of the processing tool at the start of processing can be suitably controlled according to the change in the positional relationship between the processing tool and the plate glass due to the influence of the wear of the processing tool. .

In the correction step, a correction value for setting the reference position of the processing tool in the next processing is calculated based on the movement amount, and the correction value can be calculated by the following equation (1).
CV = CF × X (1)

Here, CV is a correction value, CF is a correction factor, and X is a movement amount.

As described above, the reference position can be more suitably controlled by setting the reference position according to the correction value calculated by the equation (1).

In the correction step, the correction rate when the movement amount indicates the movement of the processing tool in the separation direction is smaller than the correction rate when the movement amount indicates the movement of the processing tool in the approaching direction. It is desirable to set.

When the processing tool tends to be separated from the end surface of the glass sheet at the start of processing, the processing tool is brought as close as possible to the end surface of the glass sheet by setting a large correction factor and determining the next reference position. Processing can be started in the state. On the other hand, if the processing tool tends to move away from the workpiece at the start of machining, set the reference position so that the machining tool is far away from the end face in the next machining operation. Without processing, there is a possibility that an unprocessed portion may remain on the plate glass. As described above, by setting the correction rate of the processing tool in the separation direction smaller than the correction rate of the processing tool in the approaching direction, it is possible to prevent the unprocessed portion from remaining.

In the measurement step, when the plurality of plate glasses are processed, the movement amount is measured for each plate glass, and in the correction step, an average value of the movement amounts of the plurality of plate glasses is used as the movement amount. desirable. As described above, the reference position for the next processing can be set with high accuracy so as to adapt to the past processing tendency of the plate glass by referring to the average value of the movement amount measured in the processing of the plurality of plate glasses. .

Further, it is desirable that the processing tool is a grindstone having a plurality of grooves that process the end face, and the control device sets the reference position for each of the grooves. According to this configuration, for example, even when the degree of wear of each groove portion is different, the reference position of the processing tool in the next processing can be suitably set for each groove portion by the correction process.

According to the present invention, when processing the end surface of a plate glass with a constant pressure type processing tool, the position of the processing tool at the start of processing can be suitably controlled.

It is a schematic plan view which shows the manufacturing apparatus of plate glass. It is a side view of an unused processing tool. It is a top view which shows a cutting process. It is a flowchart of a position control process. It is a top view which shows an end surface processing process. It is an enlarged plan view which shows the principal part of FIG. It is a graph which shows the position of the processing tool at the time of the processing start which concerns on FIG. It is a table | surface which shows the historical data which concern on the movement amount of a processing tool. It is a top view which shows an end surface processing process. It is an enlarged plan view which shows the principal part of FIG. It is a graph which shows the position of the processing tool at the time of the processing start which concerns on FIG. It is a side view which shows the processing tool of the state which the abrasion of the groove part advanced.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 thru | or FIG. 12 shows one Embodiment of the manufacturing method of the plate glass which concerns on this invention.

The plate glass G manufactured by this method has a rectangular plate shape, but is not limited to this shape. The plate thickness of the plate glass G is, for example, 0.05 mm to 10 mm, but is not limited to this range, and is set as appropriate according to conditions such as the material and size of the plate glass G.

As the material of the plate glass G, silicate glass and silica glass are used, preferably borosilicate glass, soda lime glass, aluminosilicate glass, and chemically strengthened glass, and most preferably non-alkali glass is used. Here, the alkali-free glass is a glass that does not substantially contain an alkali component (alkali metal oxide), and specifically, a glass having a weight ratio of the alkali component of 3000 ppm or less. is there. The weight ratio of the alkali component in the present invention is preferably 1000 ppm or less, more preferably 500 ppm or less, and most preferably 300 ppm or less.

FIG. 1 illustrates a plate glass processing apparatus used in the present method. The plate glass processing apparatus 1 includes a processing tool 2, a pressing force generating element 3, a measuring unit 4, and a control device 5.

The processing tool 2 is a rotary tool that processes the end surface ES of the glass sheet G from the processing start end C1 that is one end to the processing end C2 that is the other end. The processing tool 2 performs grinding and / or polishing on the end surface ES of the plate glass G. In addition, the processing tool 2 may perform a chamfering process on the end surface ES of the glass sheet G.

The processing tool 2 is provided so as to be movable relative to the plate glass G along the end surface ES of the plate glass G. In the present embodiment, an example in which the processing tool 2 performs processing while moving along the moving direction F with respect to the end surface ES of the plate glass G that is stopped is not limited thereto, but is opposite to the moving direction F. The processing tool 2 at a fixed position may process the end surface ES of the glass sheet G that moves in the direction.

The processing tool 2 includes a grindstone 6 and an arm member 7 that supports the grindstone 6. The grindstone 6 is a circular or truncated cone disk member that grinds the end surface ES of the glass sheet G while rotating. The grindstone 6 is supported by the arm member 7 so that its disk surface 6A is parallel to the main surface Ga of the plate glass G. The grindstone 6 is rotationally driven by a drive motor. The drive motor is connected to the control device 5. As the grindstone for grinding, for example, an electrodeposited grindstone in which diamond abrasive grains are hardened with a metal electrodeposition bond, or a metal bond grindstone in which abrasive grains are hardened with a metallic binder is preferably used. As a grindstone for polishing, for example, a resin bond grindstone obtained by mixing SiC abrasive grains with a binder such as a resin bond mainly composed of a curable resin and firing the mixture is suitably used.

As shown in FIG. 2, the grindstone 6 has a plurality of grooves 6a for processing the end surface ES of the plate glass G. In the case of the grindstone 6 in an unused state, the depth of each groove 6a is equal. Each groove part 6a may be comprised by the same particle size and the same kind of bond, and may be comprised by a different particle size and a different kind of bond.

The arm member 7 is pivotally supported at one end so as to be rotatable, and supports the grindstone 6 at the other end so as to be rotationally driven. The arm member 7 has a bent shape in which the ends of the two

members

7a and 7b are connected. However, the present invention is not limited to this, and the arm member 7 may be formed of an integral member and have a linear shape.

The arm member 7 causes the grindstone 6 to approach the end surface ES of the plate glass G or to move away from the end surface ES by the rotating operation. Thereby, the grindstone 6 is comprised so that a movement in the approach direction CDa approaching the end surface ES of the plate glass G and the separation direction CDb moving away from the plate glass G is possible. Hereinafter, the approach direction CDa and the separation direction CDb of the plate glass G are collectively referred to as a cutting direction CD.

The processing tool 2 is controlled to move to two locations, the reference position RP and the standby position SP. The reference position RP is an initial position set for measuring the position of the processing tool 2 in the cutting direction CD in the end face processing step. The standby position SP is a position where the processing tool 2 that has finished processing leaves the glass sheet G and waits.

The glass sheet processing apparatus 1 may further include an arm position control unit 8. The arm position control unit 8 controls the position of the arm member 7 so that the processing tool 2 moves to two positions of the standby position SP and the reference position RP. While the processing tool 2 moves from the standby position SP to the reference position RP, when the processing tool 2 moves from the reference position RP to the standby position SP, and when positioned at the standby position SP, the arm member 7 is controlled by the arm position control unit 8. It is locked and cannot move freely. On the other hand, when the processing tool 2 is positioned at the reference position RP, the control by the arm position control unit 8 does not work and the lock is released, and the arm member 7 is arm-free.

The pressing force generating element 3 urges the processing tool 2 toward the end surface ES of the glass sheet G to generate a pressing force. For example, the pressing force generating element 3 applies a couple to the arm member 7 to urge the processing tool 2 toward the end surface ES of the glass sheet G. In the present embodiment, the pressing force generating element 3 applies a couple force to the arm member 7 at the timing when the end surface ES of the glass sheet G and the grindstone 6 of the processing tool 2 moved to the reference position RP come into contact with each other. Since the arm member 7 is arm-free at the reference position RP, the processing tool 2 is biased toward the end surface ES by a couple.

The pressing force generating element 3 can be a low sliding resistance air cylinder. In the present embodiment, a diaphragm cylinder can be used as a low sliding resistance air cylinder in consideration of high-speed response due to low slidability and long life due to pistonlessness. The pressing force generating element 3 is not limited to an air cylinder, and may be a hydraulic cylinder, other known driving device, or a member capable of generating a pressing force such as a spring or a weight. The processing tool 2 is a constant pressure processing tool that is feedback-controlled by the pressing force generating element 3 so that the pressing force against the glass sheet G is constant. Since such a constant pressure type processing tool follows the undulation of the end surface ES of the plate glass G, the end surface ES of the plate glass G can be processed with a substantially constant cut amount.

The above processing tool 2 is integrated with the pressing force generating element 3, the measuring unit 4, and the arm position control unit 8 to constitute a processing unit U. The processing unit U is configured to be movable by a moving mechanism. That is, the processing unit U moves the processing tool 2 along the moving direction F or moves in the cutting direction CD via the moving mechanism.

The measuring unit 4 measures the distance between the processing tool 2 and the measuring unit 4. The measurement unit 4 is a displacement sensor such as an optical type, an eddy current type, or an ultrasonic type. In the present embodiment, an eddy current displacement sensor is used as the measurement unit 4. As shown in FIG. 1, the measuring unit 4 is disposed on the same side of the arm member 7 as the pressing force generating element 3 and the arm position control unit 8 and at a predetermined distance from the arm member 7. Then, the measuring unit 4 measures the distance from the measuring unit 4 to the arm member 7 as position information of the processing tool 2. The measuring unit 4 is connected to the control device 5 and transmits the measured data to the control device 5.

The control device 5 includes a computer (for example, a PC) on which various hardware such as a CPU, a ROM, a RAM, an HDD, and an input / output interface are mounted. The control device 5 includes an arithmetic processing unit 9 that executes various calculations and a storage unit 10 that stores data and various programs necessary for processing the glass sheet G. The control device 5 is connected to the display device 11 and causes the display device 11 to display information relating to the processing of the plate glass G. Moreover, the control apparatus 5 is connected to the drive motor which rotates the grindstone 6 of the processing tool 2, and performs control of the said drive motor.

The control device 5 executes various data and various programs stored in the storage unit 10 by the arithmetic processing unit 9, and executes a program necessary for controlling the pressing force generating element 3 and the machining unit U. The control device 5 causes the display device 11 to display the position information (numerical value) of the processing tool 2 received from the measurement unit 4.

The arithmetic processing unit 9 can calculate the movement amount D of the processing tool 2 at the start of processing from the position information of the processing tool 2. The arithmetic processing unit 9 includes a determination unit 12 that compares the movement amount D with threshold values TH1 and TH2.

The storage unit 10 stores various programs for controlling the pressing force generating element 3, the arm position control unit 8, the moving mechanism of the processing unit U, etc., in addition to the position information of the processing tool 2 acquired by the measuring unit 4. ing. The storage unit 10 stores a program (software) related to the correction of the reference position RP. Further, the storage unit 10 stores threshold values TH1 and TH2 related to the movement amount D of the processing tool 2. The values of the thresholds TH1 and TH2 can be arbitrarily set in the control device 5.

Hereinafter, a method for producing the plate glass G using the plate glass processing apparatus 1 having the above-described configuration will be described. The manufacturing method of the plate glass G mainly includes a cutting step and an end face processing step. If necessary, a cleaning process is provided as a subsequent process of the end face processing process.

As the plate glass MG supplied to the cutting step, a plate glass obtained by cutting a glass ribbon formed by various known forming methods can be used. As various known forming methods, for example, a float method, a rollout method, an overflow downdraw method, a slot downdraw method, a redraw method and the like can be employed. When the overflow down draw method is adopted, for example, molten glass is poured into an overflow groove provided on the upper part of a substantially wedge-shaped cross section, and the molten glass overflowing on both sides of the overflow groove is placed on both sides of the molded body. The glass ribbon is continuously formed by fusing and integrating at the lower end of the molded body while flowing down along the side wall.

The formed glass ribbon is gradually cooled in a slow cooling furnace to remove the distortion, and then the glass ribbon is cooled. The cooled glass ribbon is cut at a predetermined length, and both ends in the width direction are removed by cutting. Thereby, plate glass MG is obtained.

The plate glass MG supplied to the cutting step is cut into a plate glass having a desired size by cutting. In the cutting step, one or a plurality of plate glasses are cut out from the plate glass MG. Thereby, the plate glass G used as the process target of the plate glass processing apparatus 1 is obtained. The plate glass MG is cut by, for example, scribe cutting.

Hereinafter, scribe cutting will be described with reference to FIG. First, the scribe wheel SH is caused to travel along the planned cutting line CL of the large plate glass MG. Thereby, a scribe line having a predetermined depth is engraved on the plate glass MG along the planned cutting line CL. Thereafter, a bending moment is applied to the periphery of the scribe line, and the plate glass MG is broken along the scribe line. A plurality of plate glasses G are obtained by this folding.

Thereafter, an end face processing step is performed on the plate glass G by the plate glass processing apparatus 1 shown in FIG. The end surface processing step includes a step of grinding the end surface ES of the plate glass G (grinding step) and a step of polishing the end surface ES after the grinding step (polishing step). In the grinding process and the polishing process, the position control process of the grindstone 6 by the pressing force generating element 3, the measurement unit 4, the control device 5, and the arm position control unit 8 is executed.

Hereinafter, the outline of the end face machining process will be described. The plate glass G configured through the cutting process is conveyed to a processing position in the end surface processing process by a conveyor (conveying device) (not shown). After the plate glass G is disposed at the processing position, the conveyor temporarily stops until the end face processing is completed. Moreover, the plate glass G arrange | positioned in a process position is hold | maintained at the surface plate which is not shown in figure.

When the plate glass G is installed, the processing unit U starts to move along the moving direction F. When approaching the plate glass G, the grindstone 6 of the processing tool 2 moves from the standby position SP to the reference position RP under the control of the arm position control unit 8. The pressing force generating element 3 biases the arm member 7 at the timing when the grindstone 6 of the processing tool 2 comes into contact with the processing start end portion C1. By this urging, the grindstone 6 comes into contact with the end surface ES of the plate glass G with a constant pressing force.

And the processing tool 2 performs the grinding process etc. with respect to the end surface ES from the process start end part C1 to the process end part C2. During this time, the pressing force generating element 3 continues to urge the arm member 7. In this example, the processing unit U is controlled by the control device 5 so that the grinding stone 6 of the processing tool 2 is brought into contact with the end surface ES of the plate glass G, and the processing start end portion C1 on the long side of the plate glass G is changed to the processing end portion C2. Move across.

Thereafter, at the timing when the grindstone 6 is separated from the end surface ES of the glass sheet G, the pressing force generating element 3 stops urging, and the processing tool 2 returns to the standby position SP by the control of the arm position control unit 8. The processing tool 2 may move so as to process a part of the end surface ES of the plate glass G. When the processing of the end surface ES is finished, the surface plate releases the holding of the plate glass G, and the conveyor conveys the plate glass G to the next step.

Next, details of the position control process at the time of starting the end face machining process will be described with reference to FIGS. 4 to 11. As shown in FIG. 4, the position control step includes a preparation step S <b> 1 for arranging the processing tool 2 at the reference position RP before the processing tool 2 comes into contact with the end surface ES of the glass sheet G before the processing starts, and the measuring unit 4. And the measurement process S2 by the control apparatus 5, the determination process S3 by the determination part 12, and the correction process S4 by the control apparatus 5 are mainly provided.

5 to 8 show control modes when the processing tool 2 installed at the reference position RP moves in the approaching direction CDa.

As shown in FIGS. 5 and 6, in the preparation step S <b> 1, when the processing tool 2 moving in the movement direction F reaches the vicinity of the glass sheet G, the standby position SP (FIG. 5) is controlled by the arm position control unit 8. The position of the processing tool 2 at the position indicated by the alternate long and short dash line in FIG. Thereby, the processing tool 2 is installed in the reference position RP (the position indicated by the solid line in FIGS. 5 and 6). When the processing tool 2 is installed at the reference position RP, the pressing force generating element 3 starts constant pressure control of the processing tool 2 as described above.

As shown in FIGS. 5 to 7, when the groove 6 a of the processing tool 2 arranged at the reference position RP is separated from the end surface ES of the plate glass G, the pressing force generating element 3 pushes the arm member 7 to press the processing tool 2. Is moved in the approach direction CDa.

When the processing tool 2 comes into contact with the end surface ES of the plate glass G, the processing of the plate glass G starts. The pressing force generating element 3 detects this contact and adjusts the pressure on the arm member 7 so that the pressing force of the processing tool 2 is constant.

The control device 5 stores the position information of the grindstone 6 in the storage unit 10 and causes the display device 11 to display a temporal change related to the position information of the grindstone 6 as a graph. FIG. 7 shows a graph showing position information of the grindstone 6 at the start of machining. In FIG. 7, the reference position RP is displayed as 0. Further, when the grindstone 6 is positioned closer to the approaching direction CDa than the reference position RP, this position is displayed as a positive (+) value. On the other hand, when the grindstone 6 is on the side away from the reference position RP in the CDb direction, this position is displayed as a negative (−) value.

In the present embodiment, as described above, the position of the processing tool 2 located closer to the approaching direction CDa than the reference position RP is set to a positive (+) value, and the processing tool 2 located closer to the separation direction CDb than the reference position RP is used. Although the position is a negative (−) value, this positive / negative is set to simply distinguish the movement in the approach direction CDa and the movement in the separation direction CDb related to the grindstone 6. Therefore, contrary to the above, the position information on the separation direction CDb side can be set to positive (+), and the position information on the approach direction CDa side can be set to negative (−).

In the measurement step S2, the measuring unit 4 measures the position of the processing tool 2 (distance between the processing tool 2 and the measuring unit 4) and transmits the position information to the control device 5. Based on the position information of the processing tool 2 received from the measurement unit 4, the arithmetic processing unit 9 of the control device 5 determines the distance until the processing tool 2 comes into contact with the end surface ES of the glass sheet G from the reference position RP, that is, positive (+ ) Is calculated. *

In the determination step S3, the determination unit 12 of the arithmetic processing unit 9 compares the calculated movement amount D of the processing tool 2 with a positive (+) threshold value TH1. When the movement amount D exceeds the threshold value TH1, the arithmetic processing unit 9 updates the reference position RP of the processing tool 2 related to the next processing. That is, the arithmetic processing unit 9 determines the reference position RP of the processing tool 2 in the next processing based on the movement amount D of the processing tool 2 obtained by the calculation.

The reference position RP of the processing tool 2 related to the next processing is determined based on the following formula (1).
CV = CF × X (1)

Here, CV is a correction value related to the reference position RP, CF is a correction rate related to the reference position RP, and X is a measured movement amount D (mm) of the processing tool 2.

The correction value CV is a positive or negative numerical value (mm) added to the reference position RP set before the next machining. The correction factor CF is a numerical value (%) arbitrarily set between 0 and 1, for example.

When the processing tool 2 tends to move away from the end surface ES of the glass sheet G at the start of processing, it is desirable to calculate the correction value CV by setting the correction factor CF large. Thereby, the processing tool 2 installed at the reference position RP in the next processing is in a state as close as possible to the end surface ES of the plate glass G.

On the other hand, when the processing tool 2 has a tendency to move in the separation direction CDb at the start of processing, in the next processing, if the reference position RP is set so that the processing tool 2 is far away from the end surface ES, the processing tool 2 is There is a possibility that an unprocessed portion remains on the glass sheet G without contacting the end surface ES. In order to prevent such a situation, it is desirable that the correction rate CF of the processing tool 2 related to the separation direction CDb is set smaller than the correction rate CF of the processing tool 2 related to the approaching direction CDa.

The correction factor CF for correcting the reference position RP toward the approaching direction CDa is preferably set to 50 to 100%, for example. The correction factor CF when correcting the reference position RP in the separation direction CDb side is preferably set to 10 to 50%, for example.

Hereinafter, the determination step S3 and the correction step S4 by the control device 5 will be described in detail with reference to FIG. FIG. 8 illustrates a part of the processing history data created by the arithmetic processing unit 9 when processing a plurality of plate glasses G included in one lot.

This history data indicates a case where ten sheets of glass sheets G1 to G10 have been processed and the next sheet glass G11 is processed. The history data includes the value of the movement amount D of the processing tool 2 corresponding to each of the glass sheets G1 to G10. Hereinafter, the determination step S3 and the correction step S4 when the correction rate CF is set to 80% and the threshold value TH1 is set to +0.040 mm will be described.

Since the arithmetic processing unit 9 of the control device 5 updates the reference position RP based on the movement amount D of the processing tool 2 corresponding to the one sheet glass G measured most recently, the processing of one sheet glass G is completed. The determination step S3 is executed every time.

The determination part 12 of the arithmetic processing part 9 compares the data of the movement amount D of the processing tool 2 corresponding to the plate glass G10 processed prior to the plate glass G11 with the threshold value TH1. In this example, since the movement amount D (+0.060 mm) corresponding to the plate glass G10 exceeds the threshold value TH1 (+0.040 mm), the correction step S4 is executed. In the correction step S4, the arithmetic processing unit 9 multiplies the data of the movement amount D corresponding to the glass sheet G10 by the correction factor CF (80%) based on the above formula (1), and sets the correction value CV as 0. 048 mm is obtained. Unlike the present example, when the movement amount D corresponding to the plate glass G10 does not exceed the threshold value TH1, the reference position RP related to the next processing of the plate glass G11 is not performed without performing the correction step S4. It becomes the same as the reference position RP related to the processing of G10.

The control device 5 adds the correction value CV to the value of the reference position RP set at the time of the most recent processing of the plate glass G10, and sets a new reference position RP related to the next processing of the plate glass G11. To do. The control device 5 transmits control data related to the updated reference position RP to the arm position control unit 8. In the preparation step S1 of the plate glass G11, the arm position control unit 8 installs the grindstone 6 at a new reference position RP. As a result, the reference position RP in the preparation step S1 of the plate glass G11 moves by the correction value CV from the reference position RP in the preparation step S1 of the previous plate glass G10.

When processing a plurality of plate glasses G in order, it is desirable to use an average value of the movement amount D of the processing tool 2 related to the plurality of plate glasses as the movement amount D of the correction step S4. The determination step S3 and the correction step S4 when using the average value in this way will be described. The values of the threshold TH1 and the correction factor CF are the same as in the above example. In this example, with respect to the next processing of the plate glass G11, the average value of the movement amount D of the processing tool 2 related to the last three processings, that is, the average value of the movement amount D of the processing tool 2 related to the plate glasses G8 to G10. Is used to calculate the correction value CV.

In the determination step S3, the determination unit 12 of the arithmetic processing unit 9 compares the data of the movement amount D of the processing tool 2 corresponding to the plate glass G10 processed prior to the plate glass G11 with the threshold value TH1. In this example, since the moving amount D (+0.060 mm) of the processing tool 2 corresponding to the plate glass G10 exceeds the threshold value TH1 (+0.040 mm), the correction step S4 is executed. In the correction step S4, the processing unit 9 of the control device 5 refers to the history data, and sets the reference position RP of the processing tool 2 related to the next glass sheet G11, so that the processing tool 2 related to the glass sheets G8 to G10. The average value (0.040 + 0.050 + 0.060) / 3 of the movement amount D is calculated.

The arithmetic processing unit 9 multiplies the calculated average value (+0.050 mm) by the correction factor CF (80%) to obtain +0.040 mm as the correction value CV. In the same manner as described above, the arithmetic processing unit 9 adds the correction value CV to the value of the reference position RP set at the time of the most recent processing of the glass sheet G10, and a new processing related to the processing of the next glass sheet G11. A reference position RP is set. Then, the control device 5 transmits a control signal related to the new reference position RP to the arm position control unit 8.

9 to 11 show a control mode when the processing tool 2 installed at the reference position RP moves in the separation direction CDb.

As shown in FIG. 9, in the preparation step S <b> 1, while the processing tool 2 moves along the movement direction F, the arm position control unit 8 moves the grindstone 6 at the standby position SP (the position indicated by the alternate long and short dash line) to the reference position. It is moved to RP (position indicated by a solid line in FIGS. 9 and 10).

When the grindstone 6 is installed at the reference position RP, the pressing force generating element 3 starts constant pressure control of the grindstone 6. In this example, immediately after the grindstone 6 is installed at the reference position RP, it contacts the processing start end portion C1 of the plate glass G. At this time, the pressing force generating element 3 detects an excessive pressing force acting on the grindstone 6. Since the grindstone 6 is urged with a constant pressing force by the pressing force generating element 3, it moves in the separation direction CDb from the reference position RP.

In the measuring step S2, the control device 5 makes a negative (−) movement amount D (FIG. 10) related to the separation direction CDb of the grindstone 6 based on the position information of the processing tool 2 (grindstone 6) received from the measuring unit 4. And FIG. 11).

In the determination step S3, the control device 5 compares the calculated movement amount D of the grindstone 6 with the negative (−) threshold value TH2 by the determination unit 12 of the arithmetic processing unit 9. When the movement amount D exceeds the threshold value TH2, the arithmetic processing unit 9 updates the reference position RP of the processing tool 2 (grinding stone 6) for the next processing based on the above formula (1). The control device 5 transmits a control signal related to the updated new reference position RP to the arm position control unit 8.

In addition, when the grindstone 6 has the some groove part 6a, the some groove part 6a is used in order, for example for end surface processing. More specifically, after end face processing is performed using the groove portion 6a positioned at the uppermost stage, end face processing is performed using the groove section 6a positioned at the second stage from the top, and then the third stage from the top. End face processing is performed using the groove 6a. Thus, after using all the groove parts 6a, if necessary, all the groove parts 6a are dressed, and again, the plurality of groove parts 6a are sequentially used for end face processing. In such a usage pattern, as the end face processing is repeated, each groove 6a of the grindstone 6 is gradually worn, and the degree of wear differs for each groove 6a. For this reason, as shown in FIG. 12, the depth of each groove part 6a changes with progress of a process. Accordingly, the plate glass processing apparatus 1 can set the processing tool 2 at the reference position RP corresponding to each groove 6a at the start of processing by setting the reference position RP for each groove 6a having different depths.

According to the manufacturing method of the plate glass G which concerns on this embodiment demonstrated above, the movement amount D of the processing tool 2 when the processing tool 2 contacts the end surface of the plate glass G in measurement process S2 is measured, In correction | amendment process S4, Based on this movement amount D, the reference position RP of the processing tool 2 related to the next processing is set. Thereby, according to the change of the positional relationship between the processing tool 2 and the plate glass G due to the influence of the wear of the processing tool 2, the reference position RP of the processing tool 2 related to the next processing can be optimized. Therefore, it is possible to prevent a processing defect from occurring on the end surface ES of the glass sheet G and to prolong the life of the processing tool 2.

In addition, this invention is not limited to the structure of the said embodiment, It is not limited to the above-mentioned effect. The present invention can be variously modified without departing from the gist of the present invention.

In the above embodiment, an example in which the pressing force generating element 3 is configured by an air cylinder has been described, but the present invention is not limited to this configuration. For example, a link mechanism and a servo motor are connected to the arm member 7, and the rotational force of the drive shaft of the servo motor is converted into a couple force of the arm member 7 via the link mechanism. It is good. In this case, the position information of the processing tool 2 may be detected based on the rotation angle of the servo motor.

In the above-described embodiment, the example in which the correction step S4 is executed when the movement amount D of the processing tool 2 exceeds the threshold values TH1 and TH2 in the determination step S3 has been described. Instead, the correction step S4 may be executed every time.

In the above-described embodiment, the example in which the determination is performed using the movement amount D in the determination step S3 when the plurality of plate glasses G are sequentially processed is not limited thereto, but the movement amount D in the determination step S3 is a plurality of movement amounts D. You may use the average value of the moving amount | distance of the processing tool 2 which concerns on the plate glass G. FIG.

2 Processing tool 5 Control device 6a Groove part CDa Approach direction CDb Separation direction D Movement amount ES End face of plate glass G Plate glass RP Reference position S1 Preparation step S2 Measurement step S3 Determination step S4 Correction step

Claims

In the manufacturing method of plate glass provided with the end surface processing process which processes the end surface of plate glass with a processing tool,
The processing tool is configured to be movable in an approaching direction or a separation direction with respect to the end surface, and is a constant pressure processing tool that contacts the end surface with a constant pressure,
The end face processing step includes a position control step of controlling the position of the processing tool by a control device,
The position control step includes
A preparatory step of placing the processing tool at a reference position before starting the processing and before the processing tool contacts the end face;
A measurement step of measuring the amount of movement of the processing tool in the approaching direction or the separation direction when the processing tool contacts the end surface when starting processing;
A correction step of setting the reference position of the processing tool related to the next processing based on the amount of movement.
The position control step further includes a determination step of determining whether the movement amount exceeds a threshold value,
The said correction process is a manufacturing method of the plate glass of Claim 1 performed when it determines with the said moving amount having exceeded the said threshold value by the said determination process.
In the correction step, a correction value for setting the reference position of the processing tool in the next processing based on the movement amount is calculated,
The said correction value is a manufacturing method of the plate glass of Claim 1 or 2 calculated by the following formula | equation (1).
CV = CF × X (1)
(However, CV is a correction value, CF is a correction factor, and X is a movement amount.)
In the correction step, the correction rate when the movement amount indicates the movement of the processing tool in the separation direction is smaller than the correction rate when the movement amount indicates the movement of the processing tool in the approaching direction. The manufacturing method of the plate glass of Claim 3 set.
In the measuring step, when the plurality of plate glasses are processed, the amount of movement is measured for each plate glass,
The said correction process is a manufacturing method of the plate glass as described in any one of Claim 1 to 4 which uses the average value of the said moving amount of the said some plate glass as the said moving amount.
The processing tool is a grindstone having a plurality of grooves for processing the end face,
The said control apparatus is a manufacturing method of the plate glass as described in any one of Claim 1 to 5 which sets the said reference position for every said groove part.