TWI785219B - Manufacturing method of plate glass - Google Patents

Abstract

The end surface processing step of the present method includes a position control step of controlling the position of the processing tool 2 by the control device 5 . The position control step includes: a preparation step S1, before the processing starts, that is, before the processing tool 2 contacts the end surface ES, disposing the processing tool 2 at the reference position RP; a measuring step S2, measuring the proximity of the processing tool 2 when the processing tool 2 contacts the end surface ES at the beginning of processing. The movement amount D of the machining tool 2 in the direction CDa or the separation direction CDb; and the correction step S4, based on the movement amount D, the reference position RP of the machining tool 2 related to the next machining is set.

Description

Manufacturing method of plate glass

The present invention relates to a method of manufacturing a plate glass having the step of processing the end face of the plate glass.

In recent years, in order to meet demands for improvement in production efficiency or size of liquid crystal displays and organic electroluminescence (EL) displays, etc., there is a tendency for plate glass used in the displays to increase in size. When the size of the plate glass is increased, the number of glass substrates obtained from one plate glass increases, and glass substrates corresponding to large displays can be produced efficiently. In addition, in order to increase the number of processes per unit time and reduce manufacturing costs, studies are underway to increase the processing speed (processing speed) of plate glass.

If there is a flaw in the end surface of a plate glass, since a crack etc. will generate|occur|produce from this flaw, in order to prevent this, grinding|polishing processing is given to the end surface of a plate glass. The end surface processing apparatus of plate glass includes what is called a constant pressure type end surface processing apparatus which maintains the pressing force of a processing tool constant, and the stationary type end surface processing apparatus which fixes a processing tool and performs processing. When using a fixed end surface processing device to process the shape of the plate glass that has been cut in the upstream step so that the end surface of the plate glass becomes uniform, the grinding and grinding allowance (grinding) of the plate glass must be adjusted. Allowance) is set to be large, so the processing time becomes longer, and it is difficult to further increase the conveying speed (processing speed) of the plate glass.

As a technology for processing the end face of plate glass with a constant pressure method, Patent Document 1 discloses a plate glass processing device as follows, which includes: a processing tool for processing the end face of plate glass; The end of the glass exerts force on the processing tool to generate a pressing force; and the part is measured to measure the position of the processing tool. The machining tool includes a grindstone and an arm member supporting the grindstone. The pressing force generating element applies a force couple to the arm member of the processing tool, and applies force to the processing tool toward the end of the plate glass to generate pressing force. The plate glass processing device controls the pressing force generating element so that the pressing force becomes constant, thereby processing the end surface of the plate glass at high speed and with high precision.

This plate glass processing apparatus is controlled so that the processing tool moves to a reference position which is an initial position when processing starts, and a standby position where the processing tool moves from the plate glass after processing is completed. Away and standby position. When processing starts, the plate glass processing device moves the processing tool from the standby position toward the reference position, and starts control of the pressing force generated by the pressing force generating element. At this time, when the processing tool is away from the plate glass, pressing the force generating element moves the processing tool so as to contact the end surface of the plate glass.

As a processing tool for processing the end surface of the plate glass, a grindstone having a groove portion for accommodating the end portion of the plate glass is used. [Prior art literature] [Patent Document]

Patent Document 1: Japanese Patent Laid-Open No. 2014-161981

[Problem to be Solved by the Invention] The groove portion of the processing tool is gradually worn and its depth is increased as a plurality of sheets of glass are processed. 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 plate glass, for example, to make correction by moving the reference position by a fixed distance toward the end surface of the plate glass. However, the degree of wear of the groove portion of the machining tool varies, and thus the correction (movement) of the reference position may be insufficient or excessive. When the correction of the reference position is insufficient, the processing tool must be moved from the reference position toward the end surface of the sheet glass at the start of processing. If the movement amount of the processing tool becomes large, the processing tool will contact the end surface of the sheet glass with insufficient pressing force at the initial stage of processing, so that a part of the end surface of the sheet glass may become unprocessed or insufficiently processed. In addition, when the correction of the reference position is excessive, the processing tool contacts the plate glass with an excessively large pressing force at the start of processing, and moves in a direction to separate from the end surface of the plate glass. If the amount of movement of the processing tool becomes large, there is a possibility that troubles such as burning of the groove portion may occur due to an impact at the time of contact.

The present invention is made in view of the above circumstances, and an object of the present invention is to provide a plate glass in which the position of the processing tool at the start of processing can be appropriately controlled when the end surface of the plate glass is processed by a constant pressure type processing tool. manufacturing method. [Means to solve the problem]

The present invention is intended to solve the above-mentioned problems. It is a method of manufacturing a plate glass including an end surface processing step of processing the end surface of the plate glass with a processing tool, wherein the processing tool is capable of facing the end surface. a constant-pressure processing tool configured to move in an approaching direction or a separating direction and contact the end face with a fixed 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 preparation step of arranging the processing tool at a reference position before the processing starts, that is, before the processing tool contacts the end surface; a measuring step of measuring that the processing tool contacts the a moving amount of the processing tool in the approaching direction or the separating direction at the time of the end surface; and a correction step of setting the reference position of the processing tool for next processing based on the moving amount.

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

At the start of processing, the processing tool moves from the reference position toward the plate glass (approaching direction) or in the separation direction opposite to the approaching direction, depending on the degree of wear of the groove. In the present invention, in the measurement step, the movement amount of the processing tool is measured by the control device, and in the correction step, a reference position related to the next processing is set based on the movement amount. Thereby, it becomes possible to suitably control the reference position which is the initial position of the processing tool at the time of process start in response to the change of the positional relationship of a processing tool and a plate glass by the influence of the abrasion of a processing tool. Therefore, it is possible to prolong the life of the processing tool while preventing the occurrence of processing defects on the end surface of the plate glass.

In addition, in the present invention, "the amount of movement when the processing tool touches the end surface of the sheet glass" means that the processing tool moves in the approaching direction or in the period from the reference position until it contacts the end surface of the sheet glass with a desired pressure. The distance to move in the direction of separation.

The position control step may further include a determination step of determining whether the movement amount has exceeded a threshold value, and the correction step is performed when it is determined in the determination step that the movement amount has exceeded a threshold value. In this way, by setting the threshold value for the movement amount, it is possible to absorb the deviation of the movement amount caused by the calibrated positioning accuracy. Therefore, even when the positioning accuracy of calibration is low, the initial position of the processing tool at the start of processing can be appropriately controlled in accordance with 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. That is, the reference position.

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

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

In this way, by setting the reference position corresponding to the correction value calculated by the formula (1), it is possible to control the reference position more appropriately.

Preferably, in the correcting step, the correction rate when the movement amount represents the movement in the separation direction of the processing tool is set to be larger than that when the movement amount represents the approaching direction of the processing tool The correction rate during the movement is small.

When the processing tool tends to be far away from the end face of the plate glass at the beginning of processing, the correction rate is set to be large to determine the next reference position, so that the processing tool can be brought as close as possible to the end face of the plate glass Start processing in the state. On the other hand, if there is a tendency for the processing tool to move in the separation direction at the start of processing, if the reference position is set so that the processing tool and the end surface are far apart in the next processing, there will be a tendency at the start of processing. The processing tool does not touch the end surface, and there is a risk that the unprocessed part of the plate glass remains. By setting the correction rate of the processing tool related to the separation direction smaller than the correction rate of the processing tool related to the approaching direction as described above, it is possible to prevent unprocessed parts from remaining.

Preferably, in the measuring step, when a plurality of the plate glasses are processed, the movement amount is measured for each of the plate glasses, and in the correcting step, the amount of movement of the plurality of plate glasses is An average value of the movement amounts is used as the movement amount. In this way, by referring to the average value of the amount of movement measured during the processing of a plurality of plate glasses, it is possible to accurately set the reference position related to the next processing so as to adapt to the tendency of the processing of the past sheet glass.

In addition, it is desirable that the machining tool is a grindstone having a plurality of grooves for machining the end surface, and the control device sets the reference positions for the grooves respectively. According to the above configuration, even when the degrees of wear of the grooves are different, for example, the reference position of the machining tool in the next machining can be appropriately set for each groove through the correction step. [Effect of the invention]

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

Hereinafter, an embodiment for implementing the present invention will be described with reference to the drawings. 1 to 12 show one embodiment of the method for producing a sheet glass of the present invention.

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 it is not limited to this range, and is appropriately set according to conditions such as the material and size of the plate glass G.

As a material of the plate glass G, silicate glass and silica glass can be used, borosilicate glass, soda lime glass, aluminosilicate glass, chemically strengthened glass is preferably used, and alkali-free glass is most preferably used. Here, the term "alkali-free glass" refers to glass that does not substantially contain alkali components (alkali metal oxides), and specifically refers to glass in which the weight ratio of alkali components is 3000 ppm or less. The weight ratio of the alkali component in the present invention is preferably less than 1000 ppm, more preferably less than 500 ppm, most preferably less than 300 ppm.

Fig. 1 illustrates an example of a plate glass processing apparatus used in this method. The plate glass processing device 1 includes a processing tool 2 , a pressing force generating element 3 , a measurement unit 4 , and a control device 5 .

The processing tool 2 is a rotary tool which processes the end surface ES of the plate glass G from the processing start end part C1 which is one end part to the processing end part C2 which is the other side end part. The processing tool 2 performs grinding processing and/or grinding processing on the end surface ES of the plate glass G. Moreover, the processing tool 2 may be the person who performs the chamfering process of the end surface ES of the plate glass G.

The processing tool 2 is installed so that the plate glass G can move relatively along the end surface ES of the plate glass G. In the present embodiment, an example is shown 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, but it is not limited to this, and processing at a fixed position may also be used. The tool 2 processes the end surface ES of the plate glass G which moves in the direction opposite to the moving direction F. As shown in FIG.

The processing tool 2 has a grindstone 6 and an arm member 7 supporting the grindstone 6 . The grindstone 6 is a cylindrical or truncated conical disc member that performs grinding processing on the end surface ES of the plate glass G while rotating. The grindstone 6 is supported by the arm member 7 so that the disk surface 6A becomes parallel to the main surface Ga of the plate glass G. As shown in FIG. The grindstone 6 is rotationally driven by a drive motor. The drive motor is connected to the control device 5 . As grinding stones for grinding, for example, electrodeposited grindstones made by hardening diamond abrasive grains with metal electrodeposited binders, or hardened abrasive grains with metallic binders are suitably used. Metal bonded grindstone. As a grindstone for grinding, for example, a resin-bonded grindstone obtained by mixing SiC abrasive grains with a binder such as a resin binder mainly composed of a curable resin and firing the mixture is preferably used.

As shown in FIG. 2, the grindstone 6 has the several groove part 6a for processing the end surface ES of plate glass G. As shown in FIG. In the case of the grindstone 6 in the unused state, the depths of the grooves 6 a are equal. Each groove portion 6a may contain the same particle size and the same type of binder, or may contain different particle sizes and different types of binders.

One end portion of the arm member 7 is rotatably pivotally supported, and the other end portion rotatably supports the grindstone 6 . The arm member 7 has a curved shape in which the ends of the two members 7a and 7b are connected. However, the present invention is not limited thereto, and the arm member 7 may include an integral member and have a linear shape.

The arm member 7 makes the grindstone 6 approach the end surface ES of the plate glass G, or separates from the end surface ES by the rotation operation|movement. Thereby, the grindstone 6 is comprised so that it may move to the approach direction CDa which approaches the end surface ES of the plate glass G, and the separation direction CDb which separates from the plate glass G. As shown in FIG. Hereinafter, approach direction CDa and separation direction CDb of plate glass G are collectively called cutting direction CD.

The processing tool 2 is controlled so as to move toward two places, 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 surface processing step. Standby position SP is the position where the processing tool 2 which finished processing leaves|separates from plate glass G, and stands by.

The plate glass processing device 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 toward the reference position RP and the standby position SP. While the processing tool 2 is moving from the standby position SP to the reference position RP, while moving from the reference position RP to the standby position SP, and at the standby position SP, the arm member 7 is locked by the control of the arm position control unit 8 state, unable to move freely. On the other hand, when the machining tool 2 is located at the reference position RP, the control by the arm position control unit 8 does not work, the lock is released, and the arm member 7 becomes free.

The pressing force generating element 3 urges the processing tool 2 toward the end surface ES of the plate glass G to generate a pressing force. For example, the pressing force generating element 3 urges the processing tool 2 toward the end surface ES of the plate glass G by applying a force couple to the arm member 7 . In the present embodiment, the pressing force generating element 3 applies a force couple to the arm member 7 at the timing when the end surface ES of the plate glass G contacts the grindstone 6 of the processing tool 2 moved to the reference position RP. Since the arm member 7 becomes free at the reference position RP, the machining tool 2 is urged toward the end surface ES by a force couple.

The pressing force generating element 3 may be a low sliding resistance cylinder. In the embodiment of the present invention, a diaphragm cylinder may be used as a low sliding resistance cylinder in consideration of high-speed responsiveness due to low sliding properties and long life due to no piston. The pressing force generating element 3 is not limited to an air cylinder, and a member capable of generating pressing force such as a hydraulic cylinder or other well-known driving devices, or a spring or a weight can be used. The processing tool 2 is a constant-pressure processing tool that is feedback-controlled so that the pressing force on the plate glass G becomes constant by the pressing force generating element 3 . Such a constant pressure type processing tool can process the end surface ES of the plate glass G with a substantially constant cutting amount since it imitates the undulations that the end surface ES of the plate glass G has.

The processing tool 2 constitutes a processing unit U integrally with the pressing force generating element 3 , the measurement unit 4 , and the arm position control unit 8 . The processing unit U is configured to be movable by a moving mechanism. That is, the processing unit U moves the processing tool 2 in the moving direction F or moves the processing tool 2 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, for example, a displacement sensor of an optical type, an eddy current type, or an ultrasonic type. In this embodiment, an eddy current type displacement sensor is used as the measuring unit 4 . As shown in FIG. 1 , the measuring unit 4 is arranged on the same side as the pressing force generating element 3 and the arm position control unit 8 with respect to the arm member 7 , and is arranged at a predetermined distance from the arm member 7 . Then, the measurement unit 4 measures the distance from the measurement 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 sends the measured data to the control device 5 .

The control device 5 includes, for example, a central processing unit (Central Processing Unit, CPU), a read-only memory (Read Only Memory, ROM), a random access memory (Random Access Memory, RAM), a hard disk drive (Hard Disk Drive, HDD), input and output interfaces and other hardware computers (such as personal computers (Personal Computer, PC)). The control device 5 includes an arithmetic processing unit 9 that executes various calculations, and a storage unit 10 that stores data necessary for processing the plate glass G or various programs. The control device 5 is connected to the display device 11 , and displays information related to the processing of the plate glass G on the display device 11 . In addition, the control device 5 is connected to a drive motor that rotates the grindstone 6 of the processing tool 2, and controls the drive motor.

The control device 5 executes various data and various programs stored in the storage unit 10 through the arithmetic processing unit 9 , and executes programs required for controlling the pressing force generating element 3 and the processing unit U. The control device 5 displays the position information (numerical value) of the processing tool 2 received from the measurement unit 4 on the display device 11 .

The arithmetic processing unit 9 can calculate the movement amount D of the processing tool 2 at the start of processing based on 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 a threshold value TH1 and a threshold value TH2.

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

Hereinafter, the method of manufacturing the plate glass G using the plate glass processing apparatus 1 of the said structure is demonstrated. The manufacturing method of plate glass G mainly includes a cutting step and an end surface processing step. If necessary, a cleaning step is provided as a subsequent step to the facing step.

The plate glass MG obtained by cutting the glass ribbon formed by well-known various shaping|molding methods can be used for the plate glass MG supplied to a cutting process. Various known forming methods include, for example, a float method, a roll out method, an overflow down draw method, a slot down draw method, and a redraw method. ) method and so on. When using the overflow down-draw method, for example, the molten glass is made to flow into an overflow trough arranged on the upper part of the forming body having a substantially wedge-shaped cross section, and the molten glass that has overflowed from the overflow trough to both sides flows along the two sides of the forming body. The side wall portion on the side flows down, while being fused and integrated at the lower end portion of the forming body, so that the glass ribbon is continuously formed.

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

Plate glass MG supplied to a cutting process cuts out the plate glass of a desired size by cutting. In the cutting step, one or more sheet glasses are cut out from the sheet glass MG. Thereby, the plate glass G used as the processing object of the plate glass processing apparatus 1 can be obtained. Cutting of this sheet glass MG is performed by scribing and cutting, for example.

Hereinafter, scribing and cutting will be described with reference to FIG. 3 . First, the scoring wheel SH is slid along the planned cutting line CL of the large plate glass MG. Thereby, the scribed line which has predetermined depth is engraved along the planned cutting line CL on plate glass MG. Thereafter, a bending moment is applied to the periphery of the scored line, and the plate glass MG is broken along the scored line. A plurality of plate glass G is obtained by this breaking.

Thereafter, the plate glass G is subjected to an end surface processing step using the plate glass processing apparatus 1 shown in FIG. 1 . The end surface processing process includes the process (grinding process) of grinding the end surface ES of plate glass G, and the process (grinding process) of grinding this end surface ES after a grinding process. In the grinding step and the grinding step, the position control step of the grinding stone 6 using 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|summary of an end surface processing process is demonstrated. The plate glass G formed through the cutting step is conveyed to the processing position in the end surface processing step by a conveyor (conveying device) not shown in the figure. After the conveyor arranges the plate glass G at the processing position, it temporarily stops until the end surface processing is completed. In addition, the plate glass G arrange|positioned at a processing position is hold|maintained by the flat plate which is not shown in figure.

Once the plate glass G is set, the processing unit U starts to move along the movement direction F. When approaching the plate glass G, the grindstone 6 of the processing tool 2 will move from standby position SP to reference position RP by the control of the arm position control part 8. The pressing force generating element 3 urges the arm member 7 at the timing when the grinding stone 6 of the processing tool 2 contacts the processing start end portion C1. The grindstone 6 comes into contact with the end surface ES of the plate glass G with a constant pressing force by this biasing force.

Furthermore, the processing tool 2 performs grinding processing and the like on the end surface ES from the processing start end portion C1 to the processing end portion C2. During this period, the pressing force generating element 3 continues to apply force to the arm member 7 . In this example, utilizing the control of the processing unit U by the control device 5, the grinding stone 6 of the processing tool 2 is moved from the processing start end of the long side of the plate glass G in the state of having contacted the end surface ES of the plate glass G. The part C1 moves to the processing terminal part C2.

Thereafter, when the grindstone 6 separates from the end surface ES of the plate glass G, the pressing force generating element 3 stops applying force, and the processing tool 2 is returned to the standby position SP by the control of the arm position control unit 8 . In addition, the processing tool 2 can also be moved so that a part of end surface ES of plate glass G may be processed. When the processing of the end face ES is completed, the plate glass G is released from holding on the flat plate, and the conveyor conveys the plate glass G to the next step.

Next, the details of the position control step at the start of the end face processing step will be described with reference to FIGS. 4 to 11 . As shown in Figure 4, the position control step mainly includes: a preparation step S1, before the processing starts, the processing tool 2 is arranged at the reference position RP before the processing tool 2 touches the end surface ES of the sheet glass G; Measurement step S2 by the device 5 ; Judgment step S3 by the judging unit 12 ; and Correction step S4 by the control device 5 .

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

As shown in FIG. 5 and FIG. 6, in the preparation step S1, if the processing tool 2 moving along the moving direction F reaches the vicinity of the plate glass G, it will be positioned at the standby position SP ( The processing tool 2 at the position indicated by the dot chain line in FIG. 5 moves in the approach direction CDa. Thereby, the machining tool 2 is set at the reference position RP (the position indicated by the solid line in FIGS. 5 and 6 ). When the processing tool 2 is set at the reference position RP, the pressing force generating element 3 starts the constant pressure control of the processing tool 2 as described above.

As shown in FIGS. 5 to 7 , when the groove portion 6 a of the processing tool 2 disposed at the reference position RP is separated from the end surface ES of the plate glass G, the pressing force generating element 3 presses the arm member 7 to move the processing tool 2 in the approaching direction. CDa moves.

When the processing tool 2 contacts the end surface ES of the plate glass G, the process of the plate glass G starts. The pressing force generating element 3 detects this contact, and adjusts the pressing force against the arm member 7 in such a manner that the pressing force of the processing tool 2 becomes constant.

The control device 5 stores the position information of the grindstone 6 in the storage unit 10 , and displays the time change related to the position information of the grindstone 6 on the display device 11 in the form of a graph. FIG. 7 shows a graph showing positional information of the grindstone 6 at the start of processing. In FIG. 7 , the reference position RP is set to 0 and displayed. In addition, when the grindstone 6 is located closer to the approach direction CDa side than the reference position RP, the position is displayed as a positive (+) value. On the other hand, when the grindstone 6 is located closer to the separation direction CDb side than the reference position RP, the position is displayed as a negative (−) value.

In the present embodiment, as described above, the position of the processing tool 2 on the approaching direction CDa side from the reference position RP is set to a positive (+) value, and the processing tool 2 on the separation direction CDb side from the reference position RP is set to a positive (+) value. The position of the processing tool 2 is set to a negative (−) value, but the positive and negative values are set only to distinguish movement in the approaching direction CDa and movement in the separating direction CDb with respect to the grindstone 6 . Therefore, contrary to the above, the positional information on the separation direction CDb side may be set to positive (+), and the positional information on the approaching direction CDa side may be set to negative (−).

In the measurement step S2 , the measurement unit 4 measures the position of the processing tool 2 (the distance between the processing tool 2 and the measurement unit 4 ), and sends the position information of the processing tool 2 to the control device 5 . The arithmetic processing part 9 of the control device 5 calculates the distance of the processing tool 2 from the reference position RP to the end surface ES of the contact plate glass G, that is, the positive (+) movement, based on the position information of the processing tool 2 received from the measurement part 4 amount D.

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

The reference position RP of the processing tool 2 related to the next processing is determined by 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 rate CF is a numerical value (%) arbitrarily set between 0 and 1, for example.

When the processing tool 2 tends to separate from the end surface ES of the plate glass G at the time of the start of processing, it is desirable to set the correction rate CF large and calculate the correction value CV. Thereby, in the next processing, the processing tool 2 installed in the reference position RP is in the state close to the end surface ES of the plate glass G as much as possible.

On the other hand, if there is a tendency for the processing tool 2 to move in the separation direction CDb at the start of processing, if the reference position RP is set so that the processing tool 2 and the end surface ES are far apart in the next processing, then There is a possibility that the processing tool 2 does not contact the end surface ES at the start of processing, and an unprocessed part may remain on the plate glass G. In order to prevent such a situation, it is desirable to set the correction factor CF of the processing tool 2 related to the separating direction CDb to be smaller than the correction factor CF of the processing tool 2 related to the approaching direction CDa.

The correction rate CF when correcting the reference position RP on the approach direction CDa side is desirably set to, for example, 50% to 100%. The correction rate CF when correcting the reference position RP on the separation direction CDb side is desirably set to, for example, 10% to 50%.

Hereinafter, the determination step S3 and the correction step S4 by the control device 5 will be described in detail with reference to FIG. 8 . FIG. 8 exemplifies a part of 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 shows the case where the processing of ten plate glass G1 - plate glass G10 was completed, and the next plate glass G11 was processed. The value of the movement amount D of the processing tool 2 corresponding to each plate glass G1 - plate glass G10 is contained in history data. Hereinafter, the determination step S3 and the correction step S4 in the case where the correction rate CF is set to 80% and the threshold value TH1 is set to +0.040 mm will be described.

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 most recently measured sheet glass G, and therefore, the determination step S3 is executed each time the processing of the sheet glass G is completed. .

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 before the plate glass G11, and threshold value TH1. In this example, the movement amount D (+0.060 mm) corresponding to the plate glass G10 has exceeded the threshold value TH1 (+0.040 mm), so the correction step S4 is executed. In the correction step S4, the arithmetic processing part 9 multiplies the data of the movement amount D corresponding to the plate glass G10 by the correction rate CF (80%) based on said Formula (1), and obtains 0.048 mm which is correction value CV. Furthermore, unlike this example, when the movement amount D corresponding to the plate glass G10 does not exceed the threshold value TH1, the correction step S4 is not performed, and the reference position RP related to the next processing of the plate glass G11 becomes the same as The reference position RP concerning the processing of the previous plate glass G10 is the same.

The control apparatus 5 adds the value of the reference position RP set at the time of the processing of the plate glass G10 performed most recently, and the said correction value CV, and sets the new reference position RP concerning the processing of the next plate glass G11. The control device 5 sends control data related to the updated reference position RP to the arm position control unit 8 . In preparation step S1 of plate glass G11, the arm position control part 8 sets the grindstone 6 to new reference position RP. As a result, the reference position RP of the preparation step S1 of the plate glass G11 is moved by the correction value CV from the reference position RP of the preparation step S1 of the previous plate glass G10.

When processing several plate glass G sequentially, it is desirable to use the average value of the movement amount D of the processing tool 2 concerning some plate glass as the movement amount D of correction process S4. The determination step S3 and the correction step S4 when the average value is used as described above will be described. The values of the threshold value TH1 and the correction rate CF are the same as those in the above example. In this example, for the next processing of the plate glass G11, the average value of the movement amount D of the processing tool 2 related to the latest three processings, that is, the movement of the processing tool 2 related to the plate glass G8 to plate glass G10 The average value of the quantity D is used for the calculation of the correction value CV.

In determination step S3, 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 before the plate glass G11, and threshold value TH1. In this example, the movement amount D (+0.060 mm) of the processing tool 2 corresponding to the plate glass G10 has exceeded the threshold value TH1 (+0.040 mm), so the correction step S4 is executed. In the correction step S4, the arithmetic processing unit 9 of the control device 5 calculates the processing steps related to the plate glass G8 to plate glass G10 in order to set the reference position RP of the processing tool 2 related to the next plate glass G11 with reference to the historical data. The average value of the movement amount D of the tool 2 (0.040+0.050+0.060)/3.

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

FIGS. 9 to 11 show control modes in the case where the processing tool 2 set at the reference position RP moves in the separation direction CDb.

As shown in FIG. 9, in the preparation step S1, while the processing tool 2 is moving along the moving direction F, the grinding stone located at the standby position SP (the position indicated by the chain line) is moved by the arm position control unit 8. 6 moves toward the reference position RP (the position indicated by the solid line in FIGS. 9 and 10 ).

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

In the measurement step S2, the control device 5 calculates the negative (-) movement amount D( Refer to Figure 10 and Figure 11).

In the determination step S3 , the control device 5 compares the calculated movement amount D of the grindstone 6 with a negative (-) threshold value TH2 by the determination unit 12 of the arithmetic processing unit 9 . When the movement amount D has exceeded the threshold value TH2, the calculation processing unit 9 updates the reference position RP of the processing tool 2 (grindstone 6 ) related to the next processing according to the above-mentioned formula (1). The control device 5 sends 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 several groove parts 6a, for example, in end surface processing, several groove parts 6a are used sequentially. More specifically, after the end surface processing is performed using the groove portion 6a located in the uppermost layer, the end surface processing is performed using the groove portion 6a located in the second layer from above, and thereafter, the end surface processing is performed using the groove portion 6a located in the third layer from above. End processing. After all the grooves 6a are used as described above, all the grooves 6a are trimmed if necessary, and then the plurality of grooves 6a are sequentially used for end surface processing again. In such a use form, during the repeated end surface processing, each groove portion 6a of the grindstone 6 is gradually worn, and the degree of wear is different from each groove portion 6a. Therefore, as shown in FIG. 12 , the depth of each groove portion 6 a varies according to the progress of processing. Therefore, if the plate glass processing apparatus 1 sets the reference position RP to each groove part 6a which differs in depth, when processing starts, the processing tool 2 can be installed in the reference position RP corresponding to each groove part 6a.

According to the manufacturing method of the plate glass G of the present embodiment described above, the movement amount D of the processing tool 2 when the processing tool 2 touches the end surface of the plate glass G is measured in the measurement step S2, and in the correction step S4, based on the The reference position RP of the processing tool 2 related to the next processing is set according to the amount of movement D. Thereby, the reference position RP of the processing tool 2 related to the next processing can be optimized according to the change of the positional relationship of the processing tool 2 and the plate glass G by the influence of the abrasion of the processing tool 2. Therefore, it is possible to prevent the occurrence of processing defects with respect to the end surface ES of the plate glass G, and to achieve a longer life of the processing tool 2 .

In addition, this invention is not limited to the structure of the said embodiment, and is not limited to the said operation effect. Various changes can be made in this invention in the range which does not deviate from the summary of this invention.

In the said embodiment, the example which comprised the pressing force generating element 3 with the air cylinder was shown, but this invention is not limited to this structure. For example, a link mechanism and a servo motor may be connected to the arm member 7, and the rotational force of the drive shaft of the servo motor may be converted into a force couple of the arm member 7 via the link mechanism, and this force may be used as the pressing force of the processing tool 2. In this case, the position information of the processing tool 2 can also be detected according to the rotation angle of the servo motor.

In the above-described embodiment, an example in which the correction step S4 is executed when the movement amount D of the processing tool 2 exceeds the threshold value TH1 and the threshold value TH2 in the determination step S3 is shown, but the present invention is not limited thereto. It is also possible not to set a threshold value, but to perform the correction step S4 each time.

In the above-mentioned embodiment, an example was shown in which judgment was performed using the amount of movement D in the judgment step S3 when sequentially processing a plurality of plate glasses G, but the present invention is not limited thereto, and may be combined with a plurality of plate glasses G. The average value of the movement amounts of the processing tool 2 related to G is used as the movement amount D in the determination step S3.

1‧‧‧Plate glass processing device 2‧‧‧Processing tools 3‧‧‧Pressing force generating element 4‧‧‧measurement department 5‧‧‧Control Device 6‧‧‧millstone 6a‧‧‧groove 6A‧‧‧Disc noodles 7‧‧‧arm member 7a, 7b‧‧‧Component 8‧‧‧Arm Position Control Unit 9‧‧‧Computational processing department 10‧‧‧Storage Department 11‧‧‧display device 12‧‧‧judgment department C1‧‧‧Machining start C2‧‧‧Processing terminal part CL‧‧‧cut off scheduled line CD‧‧‧cutting direction CDa‧‧‧approach direction CDb‧‧‧separation direction D‧‧‧Movement ES‧‧‧Edge of plate glass F‧‧‧moving direction G, MG‧‧‧plate glass Ga‧‧‧main face RP‧‧‧Reference position SH‧‧‧marking wheel SP‧‧‧Standby position Threshold value of TH1, TH2‧‧‧ U‧‧‧Processing unit S1‧‧‧Preparation steps S2‧‧‧measurement steps S3‧‧‧judgment steps S4‧‧‧Correction steps

Fig. 1 is a schematic plan view showing a manufacturing apparatus of plate glass. Fig. 2 is a side view of an unused machining tool. Fig. 3 is a plan view showing a cutting step. Fig. 4 is a flow chart of the position control steps. Fig. 5 is a plan view showing an end face processing step. Fig. 6 is an enlarged plan view showing a main part of Fig. 5 . FIG. 7 is a graph showing the position of the machining tool at the start of the machining shown in FIG. 6 . FIG. 8 is a table showing historical data related to the movement amount of the processing tool. Fig. 9 is a plan view showing an end face processing step. Fig. 10 is an enlarged plan view showing a main part of Fig. 9 . FIG. 11 is a graph showing the position of the machining tool at the start of the machining shown in FIG. 10 . Fig. 12 is a side view of the machining tool showing a state in which abrasion of the groove portion has progressed.

S1‧‧‧Preparation steps

S2‧‧‧measurement steps

S3‧‧‧judgment steps

S4‧‧‧Correction steps

Claims (6)

A method of manufacturing plate glass, which is a method of manufacturing plate glass including an end surface processing step of processing the end surface of the plate glass by using a processing tool, wherein the processing tool is accessible relative to the end surface A constant-pressure processing tool that moves in a direction or a separation direction and contacts the end face with a fixed pressure, the end face processing step includes a position control step of controlling the position of the processing tool by a control device, the The position control step includes: a preparation step of arranging the processing tool at a reference position before the processing starts, that is, before the processing tool contacts the end surface; a measuring step of measuring when the processing tool contacts the end surface when starting processing The moving amount of the processing tool in the approaching direction or the separating direction; and a correction step of setting the reference position of the processing tool related to the next processing based on the moving amount. The method for manufacturing plate glass according to claim 1, wherein the position control step further includes a judging step of judging whether the movement amount has exceeded a threshold value, and when judging in the judging step that the The correcting step is performed when the amount of movement has exceeded a threshold value. The manufacturer of the plate glass as described in item 1 or item 2 of the scope of the patent application In the method, wherein in the correcting step, a correction value for setting the reference position of the processing tool for the next processing is calculated based on the movement amount, and the correction value is expressed by the following formula (1) to calculate, CV=CF×X‧‧‧(1) (wherein, CV is the correction value, CF is the correction rate, and X is the movement amount). The method for manufacturing plate glass according to claim 3, wherein in the correcting step, the correction rate when the movement amount represents the movement of the processing tool in the separation direction is set to a ratio The amount of movement indicates that the correction rate at the time of movement of the processing tool in the approaching direction is small. The method for manufacturing a plate glass according to claim 1 or 2, wherein in the measuring step, when a plurality of the plate glasses are processed, the movement is measured for each of the plate glasses amount, and in the correcting step, the average value of the movement amounts of the plurality of plate glasses is used as the movement amount. The method of manufacturing plate glass according to claim 1 or claim 2, wherein the processing tool is a grindstone having a plurality of grooves for processing the end surface, and the control device controls the The grooves respectively set the reference positions.

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