JP5012923B2 - Sheet glass cutting apparatus and method - Google Patents

Description

  The present invention relates to a sheet glass cutting apparatus and method.

  As a method for producing plate glass, a glass ribbon production method by a float method has been conventionally known.

  According to this manufacturing method, first, molten glass is supplied onto the molten tin surface of the float bath, and the molten glass is formed into a continuous ribbon-shaped glass ribbon on the molten tin bath. Next, a high-temperature glass ribbon formed in a predetermined width in a molten tin bath is drawn out from the surface of the molten tin. Next, the drawn glass ribbon is gradually cooled by a slow cooling furnace, and then the strip-shaped glass ribbon continuously conveyed from the slow cooling furnace is cut into a rectangular plate glass having a predetermined size by a cutting device.

  The cutting device includes a slicing device and a folding machine. The slicing apparatus cuts a slicing line perpendicular to the direction of conveyance of the glass ribbon on the surface of the glass ribbon. The folding machine applies a bending moment around the cut line, thereby causing cracks (breaks) in the cut line to propagate in the thickness direction of the sheet glass and cleaving the glass ribbon along the cut line.

  FIG. 11 is a plan view of the slicing apparatus exemplified in Patent Document 1, and FIG. 12 is a side view thereof. As shown in these drawings, the cutting apparatus has a plurality of conveying rollers 2, 2... And a cutting tool 3 made of cemented carbide. The transport roller 2 is disposed in a direction orthogonal to the transport direction of the glass ribbon 1 and transports the glass ribbon 1. Further, the cutting tool 3 is pressed against the surface of the glass ribbon 1 being conveyed by the conveying roller 2 and is moved obliquely as indicated by an arrow A with respect to the glass ribbon 1 being conveyed. Thereby, the cutting line 4 orthogonal to the conveyance direction of the glass ribbon is cut into the surface of the glass ribbon 1. As the cutting tool 3, in addition to the cutting wheel disclosed in Patent Document 1, a scribe cutter wheel disclosed in Patent Document 2 is also known.

JP-A-8-231239 JP 2006-169045 A

  By the way, in the conventional cutting apparatus shown in FIGS. 11 and 12, when the cutting tool 3 travels through the gap 5 between the conveying rollers 2 and 2, the gap between the cutting tool 3 and the glass ribbon 1 is reduced by the processing force. There was a problem that the glass ribbon 1 at the portion 5 was cracked (broken). This is because the conveyance roller 2 supporting the back surface of the glass ribbon 1 does not exist in the gap 5, and this problem is solved by setting the processing force of the cutting tool 3 on the glass ribbon 1 to be low in accordance with the gap 5. it can.

  However, if the processing force is set low, the cut line 4 is not processed to a predetermined depth of the glass ribbon 1. That is, since the crack of the cut line 4 does not progress to an appropriate depth of the glass ribbon 1, there is a problem that a cleaving failure (breakage) in which the glass ribbon 1 is not cut along the cut line 4 occurs in the subsequent folding machine. there were. Such cleaving defects occurred remarkably when the thickness of the glass ribbon 1 was 0.7 mm or less, and particularly occurred frequently when the thickness was 0.3 mm or less.

  On the other hand, there is also known a cutting line processing apparatus that fixes a back surface of a plate glass to a surface plate and processes a cut line on the surface of the plate glass. When a cutting line is processed on the surface of a sheet glass having a thickness of 0.7 mm or less with this apparatus, the cutting tool jumps on the sheet glass when the cutting tool is run, and it is difficult to process a continuous cutting line. there were. In addition, there has been a problem that the cracks in the cut line develop beyond the appropriate depth of the plate glass and the plate glass is easily broken.

  That is, in the conventional slicing apparatus, a stable slicing line could not be processed on the surface of a sheet glass having a thickness of 0.7 mm or less.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a sheet glass cutting device and a sheet glass cutting method capable of processing a stable cutting line on the surface of the plate glass.

In order to achieve the above object, the sheet glass cutting apparatus according to the present invention transports a sheet glass and a plurality of transport rollers disposed in a direction orthogonal to the sheet glass transport direction, and the transport A cutting tool that presses against the surface of the plate glass being conveyed by a roller and that is moved obliquely with respect to the conveyance direction of the plate glass to process a cutting line perpendicular to the conveyance direction of the plate glass into the surface of the plate glass And a support member that abuts against the back surface of the plate glass between the divided transport rollers, at least in a range in which the cutting tool moves obliquely. A traveling means for traveling and moving the support member along the traveling path in the same direction and at the same speed as the cutting tool. Provided, the thickness of the plate glass is 0.3 mm or less, the support member is an elastic body made of a soft elastic material, the machining force to the plate glass of the cutting tool is set to 1.6~8.0N It is characterized by.

In order to achieve the above object, the sheet glass cutting method according to the present invention is being conveyed while conveying the sheet glass by a plurality of conveying rollers arranged in a direction orthogonal to the sheet glass conveying direction. A cutting method of a sheet glass that processes a cutting line perpendicular to the conveying direction of the sheet glass into the surface of the sheet glass by pressing a cutting tool on the surface of the sheet glass and moving it obliquely with respect to the conveying direction of the sheet glass. The transport roller is divided at least in a range in which the cutting tool moves obliquely, and a travel path of a support member that contacts the back surface of the plate glass is provided between the divided transport rollers. When processing the cutting line into the surface of the sheet glass by traveling along the traveling path in the same direction and at the same speed integrally with the cutting tool by the traveling means, The thickness of the serial glazing not more than 0.3 mm, and the supporting member is an elastic body made of a soft elastic material, set the working force to said plate glass of the cutting tool 1.6～8.0N, the cutting It is characterized by processing a cutting line on a sheet glass with a tool.

  The present invention is directed to a slicing apparatus and a slicing method for processing a slicing line in a direction perpendicular to the transporting direction on the surface of a sheet glass continuously transported by a transporting roller.

  According to the present invention, the plurality of transport rollers for transporting the plate glass are divided at least in a range in which the cutting tool moves obliquely with respect to the transport direction of the plate glass, and the back surface of the plate glass is applied between the divided transport rollers. A running path of the supporting member that contacts is provided. Then, a cutting line is processed on the surface of the plate glass while the supporting member is caused to travel along the traveling path in the same direction and at the same speed as the cutting tool by the traveling means. Thereby, since the supporting member is always located below the cutting tool, the cutting line can be stably processed on the surface of the plate glass continuously conveyed by the plurality of conveying rollers.

And in the case of the plate glass whose thickness of the plate glass to be processed is 0.3 mm or less, the supporting member is made of an elastic body made of a soft elastic material, and the processing force for the plate glass of the cutting tool is set to 1.6 to 8.0 N. Set and process the cut line on the surface of the sheet glass with a cutting tool. When the support member is a hard surface plate rather than an elastic body made of a soft elastic material, the cutting tool jumps on the plate glass when the cutting tool is run due to the high hardness of the surface plate, It becomes difficult to process continuous cut lines on the surface of the plate glass. Moreover, the crack of a cut line will progress beyond the suitable depth of plate glass, and it will become easy to break plate glass.

When the processing force of the cutting tool on the plate glass is less than 1.6 N, the depth of the cut line becomes shallow, and there is a problem that the plate glass is not cut in the folding process, or the plate glass is cut not along the cut line. On the other hand, when the processing force exceeds 8.0 N, there is a problem that the cutting tool breaks through the plate glass due to the high processing force. Therefore, when processing a cut line on the surface of a plate glass having a thickness of 0.3 mm or less, the support member is made of an elastic body made of a soft elastic material, and the processing force of the cutting tool on the plate glass is set to 1.6 to 8.0 N. Set. Thereby, this invention can process the stable cut line on the surface of the plate glass of thickness 0.3mm or less continuously conveyed by the conveyance roller.

  The shape of the plate glass in the present invention may be a band shape or a rectangular shape.

  The support member is configured in a roller shape, and this support member is rotatably supported by the bearing portion of the travel means, so that the support member traveling on the travel path is rotated while being rotated by frictional resistance with the back surface of the plate glass. Is done. Thereby, since the contact resistance of the back surface of plate glass and a supporting member is reduced, generation | occurrence | production of the scuff resulting from a support member contacting the back surface of plate glass can be suppressed. Further, the roller-shaped support member may run while being rotated by a rotating device such as a motor. Thereby, even if the frictional resistance between the support member and the back surface of the plate glass is low, the roller-like support member can be prevented from traveling while rotating without rotating the back surface of the plate glass. Therefore, generation | occurrence | production of the scraping resulting from a supporting member contacting the back surface of plate glass can be suppressed.

The present invention as described above can be stably cut the following glass sheet thickness of 0.3mm to fracture failure is likely to occur. That is, the present invention is more suitable for cutting a plate glass having a thickness of 0.3 mm or less.

  In the present invention, the support member preferably has a hardness of 50 to 90 ° (according to JIS K6301 spring type A).

  If the hardness of the support member is less than 50 °, due to the softness of the support member, the cut line processing portion of the plate glass that is pressed against the cutting tool is sunk into the support member, and the elastic return force of the support member that is elastically deformed Is added to the slicing portion. For this reason, an excessive force acts on the cut line processing portion, and the cut line processing portion is easily damaged. On the other hand, if the hardness of the support member exceeds 90 °, when the cutting tool is run due to the hardness of the support member, the cutting tool jumps on the plate glass, and a continuous cut line is processed on the surface of the plate glass. It becomes difficult. In addition, there has been a problem that the cracks in the cut line develop beyond the appropriate depth of the plate glass and the plate glass is easily broken.

  Therefore, according to this invention, the more stable cut line can be processed into the surface of plate glass by making the hardness of a supporting member into 50-90 degrees.

According to the sheet glass cutting apparatus and the sheet glass cutting method according to the present invention, it is possible to stably process a cutting line on the surface of a sheet glass having a thickness of 0.3 mm or less.

Sectional drawing of the plate glass manufacturing equipment by the float method in which the wire processing apparatus of 1st Embodiment was installed Plan view of the slicing apparatus shown in FIG. The perspective view of the cutting line processing apparatus shown in FIG. Structure diagram of cutting tool travel means Side view of transport roller with backup roller positioned between transport rollers The arrow view seen from the A-A 'line of FIG. Side view of reference line slicing machine Table showing the results of evaluation with a plate glass with a thickness of 0.1 mm Table showing the results of evaluation with 0.2 mm thick plate glass Table showing the evaluation results with a plate glass with a thickness of 0.3 mm Plan view of a conventional slicing machine Side view of the cutting apparatus shown in FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a sheet glass cutting device and a cutting method according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view of a plate glass manufacturing facility 12 by a float method to which the sheet glass cutting device 10 according to the first embodiment is applied. Moreover, the cutting line processing apparatus 10 of 1st Embodiment is an apparatus which processes a cutting line favorably to the glass ribbon (plate glass) 14 used as a glass substrate for liquid crystal displays with a thickness of 0.7 mm or less. In the following description, the downstream side refers to the same direction side with respect to the conveyance direction of the glass ribbon 14 in FIG. 1 (in the direction of arrow X in FIG. 1), and the opposite direction side is referred to as the upstream side.

  In the sheet glass manufacturing facility 12 shown in FIG. 1, a float bath 20, a dross box 22, a slow cooling furnace 24, and a slicing apparatus 10 are sequentially arranged from the upstream side toward the downstream side.

  In the float bath 20, the glass ribbon 14 is formed by continuously supplying molten glass to the bath surface of the molten tin 28. The glass ribbon 14 is pulled up from the molten tin 28 by the lift-out roll 30 of the dross box 22. Thereafter, the glass ribbon 14 passes through the dross box 22 and is gradually cooled to room temperature by being conveyed into the slow cooling furnace 24 by the slow cooling roll 26.

  The glass ribbon 14 that has passed through the slow cooling furnace 24 is cleaved in the width direction of the glass ribbon 14 by the cutting apparatus 10 and a folding machine (not shown). The folding machine is a well-known device that applies a bending moment around a cut line processed on the surface of the glass ribbon 14 and cleaves the glass ribbon 14 along the cut line.

  In addition, before the cutting line in the width direction of the glass ribbon 14 is processed on the surface, the cutting line in the transport direction along the transport direction of the glass ribbon 14 is formed on the surfaces at both ends in the width direction of the glass ribbon 14 by a cutting process (not shown). It is processed in advance by an apparatus. It is preferable that the cutting tool of this slicing apparatus is disposed above the conveying roller. As will be described later, after the glass ribbon is cleaved in the width direction, both ends of the glass ribbon are cleaved along a cut line in the traveling direction by a folding machine (not shown). The conveying roller facing the cutting tool also has the same hardness as that of a backup roller (supporting member) 48 described later from the viewpoint of stably processing the cutting line in the conveying direction on the glass ribbon 14 having a thickness of 0.7 mm. It is preferable to have. Moreover, it is preferable to set the processing force of the cutting tool on the glass ribbon 14 to be the same as the processing force of the cutting tool 44 described later.

  As shown in FIGS. 2 and 3, the cutting apparatus 10 that processes the cutting line in the width direction of the glass ribbon 14 includes a plurality of conveying rollers 32, 34, 36, 38, 40, 42, a cutting tool 44, and a backup roller. 48.

  The conveyance rollers 32 to 42 are arranged in a direction orthogonal to the conveyance direction of the glass ribbon 14 while conveying the glass ribbon 14 carried out from the slow cooling furnace 24 (see FIG. 1). Note that the number of the transport rollers 32 to 42 is not limited to six.

  On the other hand, the cutting tool 44 is pressed against the surface of the glass ribbon 14 being transported on the transport rollers 32 to 42, and is moved in the transport direction of the glass ribbon 14 by the travel means described below with respect to the glass ribbon 14 being transported. In contrast, it is moved obliquely. Thereby, the cut line 46 orthogonal to the conveyance direction of the glass ribbon 14 is processed into the surface of the glass ribbon 14. As the cutting tool 44, a cemented carbide wheel, a scribe cutter wheel, or the like is used. Further, when the transport speed of the glass ribbon 14 is v, the travel speed of the cutting tool 44 is w, and the travel angle of the cutting tool 44 with respect to the transport direction of the glass ribbon 14 is θ, the travel speed w is w = v / cos θ. By setting to, the cut line 46 is processed in a direction orthogonal to the conveyance direction of the glass ribbon 14. Here, the traveling locus of the cutting tool 44 is assumed to be A (see FIGS. 2 and 3).

  A travel path C for the backup roller 48 to travel along the travel locus B along the travel locus A is formed at a lower position along the travel locus A of the cutting tool 44. And in order to form this running path C, the conveyance rollers 32-42 are divided into 2 by the axial direction. That is, the transport roller 32 is divided into transport rollers 32A and 32B. Similarly, the transport roller 34 is transported to the transport rollers 34A and 34B, the transport roller 36 is transported to the transport rollers 36A and 36B, and the transport roller 38 is transported to the transport rollers 38A and 38B. The conveyance roller 40 is divided into conveyance rollers 40A and 40B, and the conveyance roller 42 is divided into conveyance rollers 42A and 42B, respectively. Thereby, a traveling path C through which the backup roller 48 passes is formed. The conveyance rollers 32 to 42 are rollers arranged at least in a range in which the cutting tool 44 moves obliquely.

  The backup roller 48 is in contact with the back surface of the glass ribbon 14 and receives the processing force of the cutting tool 44 on the glass ribbon 14 via the glass ribbon 14 and is made of an elastic body made of a soft elastic material. The backup roller 48 travels in the same direction and at the same speed as the cutting tool 44 by the travel means 50 shown in FIG.

  The traveling means 50 is a feed screw device, and includes a motor 52, a feed screw 54 connected to the output shaft of the motor 52, and a nut 58. An air cylinder 60 constituting an advancing / retreating mechanism is mounted on the upper portion of the nut 58, and a holder 66 for rotatably supporting the backup roller 48 by a shaft 64 is provided on the upper portion of the piston 62 of the air cylinder 60. . The motor 52 is controlled to synchronize with the drive unit of the cutting tool 44 by a control unit (not shown).

  Therefore, according to the traveling means 50 configured as described above, the motor 52 is driven to move the nut 58, and the backup roller 48 is moved to the position a which is the standby position. At this time, the cutting tool 44 is waiting at a position above the backup roller 48. When the cutting tool 44 is lowered toward the glass ribbon 14 and the cutting of the cutting line is started, the piston 62 is extended in synchronization with the operation, and the backup roller 48 is moved to the position b. As a result, the backup roller 48 contacts the back surface of the glass ribbon 14 and receives the pressing force of the cutting tool 44 that contacts the front surface. Thereafter, the backup roller 48 is moved by the feeding operation by the motor 52 to the position c at the machining end position in the same direction and at the same speed as the cutting tool 44 in a state where it is in contact with the back surface of the glass ribbon 14.

  Thereby, according to this cutting line processing apparatus 10, the cutting line 46 is processed on the surface of the glass ribbon 14 as shown in FIG. Further, since the elastic backup roller 48 is always located below the cutting tool 44, the cutting line 46 can be stably processed on the surface of the glass ribbon 14 that is continuously conveyed by the conveying rollers 32-42. Can do.

  When the cutting line 46 is processed, the piston 62 is contracted thereafter, and the backup roller 48 is moved to the position d retracted from the glass ribbon 14. Next, the backup roller 48 is moved back to the original position a by the motor 52 and waits until the next machining operation. The cutting tool 44 is the same, and when the cutting process is completed, the cutting tool 44 is retracted above the glass ribbon 14 and returned to the processing start position. The traveling means 50 is not limited to a feed screw device, and may be a feed mechanism constituted by a rack and a pinion, or a feed mechanism driven by a belt. Further, the diameter of the conveying rollers 32 to 42 is 50 to 300 mm, preferably 150 to 250 mm.

  By the way, the cutting line processing apparatus 10 of 1st Embodiment processes the cutting line 46 on the surface of the glass ribbon 14 whose thickness is 0.7 mm or less as mentioned above.

  In order to process the cut line 46 on the surface of such a glass ribbon 14, this cut line processing apparatus 10 is installed in the following specifications.

  That is, according to the cutting apparatus 10, the backup roller 48 is formed of an elastic body made of a soft elastic material, and the processing force of the cutting tool 44 on the glass ribbon 14 is set to 1.6 to 8.0 N.

  When the backup roller 48 is a hard metal roller instead of an elastic body made of a soft elastic material, the cutting tool 44 is moved to the glass ribbon 14 when the cutting tool 44 is run due to the high hardness of the roller. It boils up and it becomes difficult to process the continuous cut line 46 on the surface of the glass ribbon 14. Moreover, the crack of a cut line will progress beyond the suitable depth of plate glass, and it will become easy to break plate glass.

  When the processing force of the cutting tool 44 on the glass ribbon 14 is less than 1.6 N, the depth of the cut line 46 with respect to the glass ribbon 14 becomes shallow, and the cut line 46 with an appropriate depth is formed on the surface of the glass ribbon 14 in the folding machine. It becomes difficult to process. On the other hand, when the processing force exceeds 8.0 N, there is a problem that the cutting tool 44 breaks through the glass ribbon 14 due to the high processing force.

  Therefore, when the cut line 46 is processed on the surface of the glass ribbon 14 having a thickness of 0.7 mm or less, the backup roller 48 is an elastic body made of a soft elastic material, and the processing force of the cutting tool 44 on the glass ribbon 14 is 1. It is preferable to set to 6 to 8.0 N. Therefore, according to the slicing apparatus 10 of the first embodiment set to such specifications, the surface of the glass ribbon 14 having a thickness of 0.7 mm or less that is continuously conveyed by the conveying rollers 32 to 42. A stable cutting line 46 can be processed.

  Since the backup roller 48 is a rotating roller, the traveling backup roller 48 travels while being rotated by frictional resistance with the back surface of the glass ribbon 14. Thereby, since the contact resistance between the back surface of the glass ribbon 14 and the backup roller 48 is reduced, it is possible to suppress the generation of scratches caused by the backup roller 48 coming into contact with the back surface of the glass ribbon 14. The roller diameter may be the same as the diameter of the transport rollers 32 to 42, or the size may be changed. The backup roller 48 may run while being rotated by a rotating device (not shown) such as a motor.

  Incidentally, the hardness of the backup roller 48 is preferably 50 to 90 ° (conforming to JIS K6301 spring type A type).

  When the hardness of the backup roller 48 is less than 50 °, due to the softness of the backup roller 48, the cut line processing portion of the glass ribbon 14 with which the cutting tool 44 is pressed and pressed into the backup roller 48 and elastically deformed. The elastic restoring force of the backup roller 48 is applied to the cut line processing portion. For this reason, since an extra force acts on the cut line processing portion, the cut line processing portion is easily damaged. On the other hand, when the hardness of the backup roller 48 exceeds 90 °, the cutting tool 44 jumps on the glass ribbon 14 when the cutting tool 44 is caused to travel due to the hardness of the backup roller 48, resulting in a continuous cut line. It becomes difficult to process 46 on the surface of the glass ribbon 14. Moreover, the crack of a cut line will progress beyond the suitable depth of plate glass, and it will become easy to break plate glass.

  Therefore, by setting the hardness of the backup roller 48 to 50 to 90 °, a more stable cut line 46 can be processed on the surface of the glass ribbon 14.

  FIG. 5 is a side view of the transport roller 32 in which the backup roller 48 is positioned between the transport rollers 32A and 32B, and FIG. 6 is an arrow view taken along the line A-A 'of FIG.

  As shown in FIGS. 5 and 6, it is preferable to chamfer a on the opposed edge portions a of the divided conveying rollers 32 </ b> A and 32 </ b> B (the same applies to all the divided rollers). Similarly, it is preferable to chamfer the edges b at both ends of the backup roller 48. By chamfering the edges a and b, it is possible to prevent the back surface of the glass ribbon 14 from being wrinkled by the roller edge.

FIG. 7 is a side view showing the slicing apparatus 70 of the reference example .

  This slicing device 70 fixes a back surface of a plate glass 74 having a thickness of 0.7 mm or less to an immovable sheet material (support member) 72, and presses the cutting tool 44 against the surface of the fixed plate glass 74 to run. An apparatus for processing a desired cut line 46 on the surface. The sheet material 72 is also an elastic body made of a soft elastic material like the backup roller 48 (see FIG. 4 and the like), and preferably has a hardness of 50 to 90 °. Moreover, the processing force with respect to the plate glass 74 of the cutting tool 44 is similarly set to 1.6-8.0N.

Thereby, the cutting line processing apparatus 70 of the reference example can also process the stable cutting line 46 on the surface of the plate glass 74 having a thickness of 0.7 mm or less, similarly to the cutting line processing apparatus 10 of the first embodiment.

  In addition, examples of the material of the backup roller 48 and the sheet material 72 satisfying the hardness include high nitrile resin, urethane, fluorine rubber, and chloroprene rubber. However, the material is not limited to this, and a soft elastic material is used. A material having a hardness of 50 to 90 ° is more preferable.

(Example)
Three types of plate glass having a thickness of 0.1 mm, 0.2 mm, and 0.3 mm are manufactured, and the back surfaces of these plate glasses are supported by backup rollers having a hardness of 50 °, 70 °, and 90 °, respectively. The surface was pressed with a predetermined processing force, and a scribing cutter wheel was run at a running speed of 600 mm / sec to cut a cut line on the surface of the plate glass. The backup roller was moved integrally with the scribe cutter wheel in the same direction and at the same speed.

  Subsequently, the plate glass was cleaved along the cutting line using a folding machine, and the cleaved state of the plate glass was evaluated according to the following criteria.

<Criteria>
A: The plate glass could be cut along the cutting line.
B: It was difficult to break the plate glass, but the plate glass could be cleaved along the cutting line.
C: The plate glass could not be cleaved, or the plate glass could not be cleaved along the cutting line.

  FIG. 8 is a table showing the evaluation results with a plate glass having a thickness of 0.1 mm.

  When the backup roller has a hardness of 50 °, 70 °, and 90 ° in a plate glass having a thickness of 0.1 mm, the processing force of the scribe cutter wheel on the plate glass is 1.8 to 2.5 N and 1.6 to 2.5 N, respectively. If it was 1.7-3.0N, the plate glass could be cut along the cut line.

  FIG. 9 is a table showing the evaluation results with a plate glass having a thickness of 0.2 mm.

  When the backup roller has a hardness of 50 °, 70 °, and 90 ° in a plate glass having a thickness of 0.2 mm, the processing force of the scribe cutter wheel on the plate glass is 3.3 to 5.4 N and 1.9 to 3.7 N, respectively. If it was 2.4-3.5N, the plate glass could be cut along the cut line.

  FIG. 10 is a table showing the evaluation results at a thickness of 0.3 mm.

  In a plate glass having a thickness of 0.3 mm, when the hardness of the backup roller is 50 °, 70 °, and 90 °, the processing force of the scribe cutter wheel on the plate glass is 3.0 to 6.4 N, 3.2 to 8.0 N, respectively. 2.2 to 4.9 N, the plate glass could be cleaved along the cutting line.

  From the evaluation results shown in FIGS. 8 to 10, it has been found that as the thickness of the plate glass is reduced, the appropriate processing force for the plate glass of the scribe cutter wheel is reduced and the range of the appropriate processing force is reduced. It has also been found that there is a range of hardness of the backup roller in order to achieve an appropriate slicing process.

  Furthermore, when performing the cutting process on the surface of the plate glass having a thickness of 0.3 mm or less, the backup roller (support member) is made of an elastic body made of a soft elastic material, and the scribe cutter wheel (cutting tool) plate glass is used. It was also proved that it is good to set the processing force to 1.6 to 8.0 N.

  In addition, although the present Example demonstrated the plate glass of thickness 0.3mm or less, a favorable result is obtained even if it uses plate glass of thickness 0.7mm or less.

(Comparative example)
Except for changing to a backup roller with a hardness of 100 °, cutting the surface of the sheet glass in the same manner as in the example, cracks in the cutting line propagated beyond the appropriate depth of the sheet glass, and put into the folding machine Before, the plate glass broke without following the cutting line.

  DESCRIPTION OF SYMBOLS 1 ... Glass ribbon, 2 ... Conveyance roller, 3 ... Cutting tool, 4 ... Cutting line, 5 ... Gap between rollers, 10 ... Cutting line processing apparatus, 12 ... Sheet glass manufacturing equipment, 14 ... Glass ribbon, 20 ... Float bath, 22 ... Dross box, 24 ... slow cooling furnace, 26 ... slow cooling roll, 28 ... molten tin, 30 ... lift-out roll, 32-42 ... transport roller, 32A-42A ... divided transport roller, 32B-42B ... split transport roller , 44 ... cutting tool, 46 ... cutting line, 48 ... backup roller, 50 ... travel means, 52 ... motor, 54 ... feed screw, 58 ... nut, 60 ... air cylinder, 62 ... piston, 64 ... shaft, 66 ... holder, 70 ... Cut line processing device, 72 ... Sheet material, 74 ... Plate glass

Claims (4)

A plurality of conveying rollers disposed in a direction orthogonal to the conveying direction of the sheet glass while conveying the sheet glass;
While being pressed against the surface of the plate glass being conveyed by the conveyance roller, the cut line perpendicular to the conveyance direction of the plate glass is processed into the surface of the plate glass by being moved obliquely with respect to the conveyance direction of the plate glass. A cutting tool;
In a sheet glass cutting device with
The conveying roller is divided at least in a range in which the cutting tool is moved obliquely, and a traveling path of a support member that contacts the back surface of the plate glass is provided between the divided conveying rollers.
Traveling means is provided for moving the support member along the travel path in the same direction and at the same speed as the cutting tool,
The thickness of the plate glass is 0.3 mm or less, the support member is an elastic body made of a soft elastic material, and the processing force of the cutting tool on the plate glass is set to 1.6 to 8.0 N. Sheet glass cutting line processing equipment. The sheet glass cutting device according to claim 1, wherein the support member has a hardness of 50 to 90 °. While transporting the plate glass by a plurality of transport rollers arranged in a direction orthogonal to the transport direction of the plate glass, a cutting tool is pressed against the surface of the plate glass being transported to the transport direction of the plate glass. In the sheet glass cutting method for processing a cutting line perpendicular to the conveying direction of the plate glass into the surface of the plate glass,
The conveying roller is divided at least in a range in which the cutting tool is moved obliquely, and a traveling path of a support member that contacts the back surface of the plate glass is provided between the divided conveying rollers.
When the supporting member is caused to travel along the traveling path in the same direction and at the same speed as the cutting tool by traveling means, and the cut line is processed into the surface of the sheet glass, the thickness of the sheet glass is reduced to 0. 0. 3 mm or less, the support member is an elastic body made of a soft elastic material, the processing force of the cutting tool on the plate glass is set to 1.6 to 8.0 N, and a cutting line is processed on the surface of the plate glass by the cutting tool. A method for cutting a sheet glass. The cutting method of the sheet glass according to claim 3, wherein the support member has a hardness of 50 to 90 °.

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