KR20200021903A - Method of cutting glass plate and glass plate - Google Patents

Abstract

The present invention relates to a method of cutting a glass plate. The method of cutting a glass plate comprises: a scribing process of forming a cutting line by scribing; a hollow cutting process of performing hollow cutting; and a stress cutting process of performing stress cutting along the cutting line. According to the cutting method of the present invention, it is possible to cut a glass plate with high precision and high speed.

Description

Glass plate cutting method and glass plate {METHOD OF CUTTING GLASS PLATE AND GLASS PLATE}

The present invention relates to a method for cutting a glass plate, and more particularly, to a cutting method for cutting a glass plate by three steps of scribing, hollow cutting, and stress cutting. Moreover, this invention relates to the glass plate cut | disconnected by the glass plate cutting device.

As information volumes increase, the demand for high-performance displays is increasing, and cover glass having a flat main surface has been developed for portable telephones, portable tablets, on-vehicle displays, and the like. On the other hand, the demand of the cover glass which has a complicated shape like an incurve, and the cover glass which has a curved surface is increasing these days, and the advanced processing technique which cuts the glass plate with the precision equivalent to a flat plate glass is calculated | required. And not only the processing precision but the improvement of the processing speed is also calculated | required.

When cutting flat glass, the method of forming a cutting line and slicing using scribing is known. However, when a glass plate having a curved surface (hereinafter referred to as curved glass) is broken by applying stress after scribing, glass contact occurs between the glass piece to be broken and the glass plate, so that the glass cannot be broken.

Moreover, even when it is flat glass, when cutting out a glass plate of a complicated shape such as an in-curve, especially when the glass plate is cut at an acute angle with respect to the end face of the glass plate, cracking occurs as a starting point of breakage on the glass plate. There was a problem that can not be used.

In the case of cutting curved glass, the cutting is halo-cut by mainstone. Moreover, when cutting curved glass, chipping was easy to come out when halo cutting using a grindstone similarly to flat glass, and it was difficult to process with high precision. In addition, when the feed rate of the grindstone is increased to improve the processing speed, the size of the chipping becomes large, resulting in a problem that the yield deteriorates.

Therefore, when the object to be processed is curved glass, and when the object to be cut is a flat glass, the glass to be cut has a complicated shape such as an incurve. A cutting method is required.

Japanese Unexamined Patent Publication No. 2003-277088 Japanese Patent Publication No. 2017-526603 Japanese Unexamined Patent Publication No. 2017-132684

When cutting curved glass at high precision and at high speed, or when cutting a glass plate of a complicated shape such as an incurve from flat glass, it is necessary to satisfy the conditions that the glass plate can be processed similarly to flat glass.

Patent Literature 1 forms at least one cut in flat glass by a disk blade, connects the cut edge and the side edges or cut edges of the thin glass, and draws a cutting line with a glass cutter. Disclosed is a method of cutting a glass by breaking a portion surrounded by a cutting line. However, in the case where the cutout is formed in the glass plate by the disk-shaped blade, only a straight cut can be formed, which is effective when the corner of the cutout is perpendicular to the cutout, but is not suitable for processing a complicated shape. Moreover, although patent document 1 discloses the process of making a hole with a core drill by the glass plate of thickness 3mm, it cuts with a wheel blade or grindstone, without using a core drill for the glass plate of thickness 2mm.

Patent document 2 includes the process of drawing a cutting line on the surface of glass using a cutting tool, and the cutting process of applying a local support means to an opposite surface in accordance with a cutting line, and moving a local support means on an opposite surface, and cutting Disclosed is a method for cutting glass, which comprises cutting out a complex shape from a glass plate by a method including applying to the length of a line. However, since the method of patent document 2 does not make curved glass into a process object, and uses pressurization means in the opposite surface of a cut line, the jig which fixes a glass from a back surface is needed.

Patent document 3 discloses the structure of the curved glass processing apparatus which presses a cutter on curved glass, moves a cutter tool and a glass plate relative, and forms a cutting line in a glass plate. However, Patent Document 3 only discloses a process of performing stress cutting after formation of a cutting line using a cutter tool, and also discloses a cutting method of cutting curved glass by both steps of hauling cutting and scribing by grinding wheel. Not.

The said patent documents 1, 2 do not assume curved glass as a process object. In addition, the processing method does not use three processes of scribing, halo cutting, and stress cutting. Moreover, although patent document 3 discloses the case of cut | disconnecting bending glass using scribing, when cutting out the glass plate of a complicated shape like an incurve, the cutting by only scribing becomes complicated, It is difficult in reality.

The present invention provides a method of cutting a glass plate at high precision and at high speed by using three processes of scribing, hollow cutting and stress cutting. This invention provides the cutting method of the glass plate which was excellent in processing precision and a processing speed especially when cutting curved glass, or when cutting out complicated shapes, such as an incurve, from flat glass. Moreover, this invention provides the glass plate which has the curved surface cut | disconnected by the glass plate cutting device, and the magnitude | size of the chipping which generate | occur | produced at the time of cutting is 0.01-0.4 mm.

That is, the present invention is as follows.

1.A cutting method for cutting a glass plate,

The cutting method,

A scribing step of forming a cutting line by scribing;

Halo cutting process to cut halo,

It has a stress cutting process of carrying out the stress cutting along the said cutting line, The cutting method of the glass plate characterized by the above-mentioned.

2. The said hollow cutting process is a cutting method of the glass plate of said 1 which is a point process.

3. The said scribing process is a cutting method of the glass plate of said 1 performed by any one of a cutter wheel, a diamond tip, a pulse laser, or a thermal stress.

4. Said hollow cutting process is a cutting method of the glass plate of said 1 which performs with the grindstone which driven the high speed spindle by electric or compressed air.

5. The said 1st cutting cutting process is a cutting method of the glass plate of said 1 performed by any one of high pressure water, melt | fusion, or a pulse laser.

6. Said stress cutting process is cutting method of glass plate of said 1 performed by applying bending stress or thermal stress.

7. The method for cutting the glass plate according to 1 above, wherein the scribing step and the halo cutting step are performed by the same apparatus.

8. The said glass plate is a cutting method of the glass plate in any one of said 1-7 which is a glass plate which has a curved surface.

9. The said glass plate which has a curved surface is a cutting method of the said glass plate of 8 which has a curved surface which is short or a curved.

10. A glass plate cut by a glass plate cutting device, wherein the glass plate is a glass plate having a curved surface, and the size of the chipping generated at the time of cutting is in the range of 0.01 to 0.4 mm.

According to the present invention, by performing the halo cutting of the glass plate, a constant gap necessary for breaking the glass plate after scribing is formed in a free curve. Therefore, since the contact between glass does not occur between the glass piece and the glass plate, even if the glass plate has a curved surface such as short or curved, the glass plate can be cut with high precision and at high speed. In addition, even when cutting out a glass plate of a complicated shape such as an incurve, by introducing a scribing, the process distance of the hauling cutting process is shortened, the throughput is improved, chipping is also reduced, and the mirror surface is reduced in stress cutting. A cross section close to can be obtained.

The above-mentioned halo cut | disconnect also includes the process of penetrating with a grindstone etc. (hereinafter, point processing). The gap formed by dot processing also exhibits the effect of preventing the contact between the glass plate and the glass piece to be broken, similarly to the gap formed by the halo cutting. Then, after forming the gap by dot processing, cutting lines are formed to break the glass plate so as to connect the gap by scribing, thereby exhibiting effects such as throughput improvement and chipping reduction.

In addition, by increasing the number of revolutions by using a high-speed spindle, the size of chipping generated at the time of cutting the glass plate by the grinding wheel is also reduced. Therefore, additional machining precision and processing can be performed by matching with a series of processes from scribing to stress cutting. Speed can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows one Embodiment of the glass plate cut | disconnected by the method of this invention.
It is a figure for demonstrating the glass plate cutting device used for this invention.
3 (A) and 3 (B) are flowcharts showing a procedure of cutting a glass plate by the method of the present invention.
Fig. 4 (A) is a view showing a procedure for cutting a glass plate according to the prior art, Fig. 4 (B) is a view showing a procedure for cutting a glass plate using the method of the present invention, and Fig. 4 (C) is a view. The figure which showed the procedure of cutting a glass plate using the method of this invention.
It is explanatory drawing which shows the positional relationship of a glass plate and a cutter tool.
6: (A) is explanatory drawing which shows the positional relationship of a glass plate and a grindstone, and FIG. 6 (B) is explanatory drawing which shows the clearance gap d at the time of carrying out the cutting of a glass plate with a grindstone.
7 is an explanatory diagram showing a step of breaking a glass plate by stress cutting.

The following definitions of terms apply throughout this specification.

A "plane" means the part whose average curvature radius is 100000 mm or more.

A "curved surface" means the part whose average curvature radius is less than 100000 mm.

"Point processing" means the processing method of penetrating a glass plate using a grindstone etc.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of the cutting method of the glass plate of this invention is described with reference to drawings.

<Glass plate>

1 is a perspective view according to one embodiment of curved glass 10 cut by the method of the present invention.

As shown in FIG. 1, the glass plate cut | disconnected by the method of this invention has a curved surface, the 1st surface 11, the 2nd surface 12 which opposes the 1st surface 11, and the 1st surface ( 11) and a glass plate 10a having at least one end face 13 connecting the second surface 12 to each other.

The glass plate 10a in this specification means that it is a plate-shaped object with the length of the 1st surface 11 and the 2nd surface 12, or the length of the width direction larger than the thickness of the cross section 13. As shown in FIG.

It does not specifically limit which main surface is made into a 1st surface or a 2nd surface among two main surfaces of the glass plate 10a. For example, when using the glass plate 10a as a cover glass of a display, the surface of the side used as a display surface, ie, the surface exposed to the outside, is made into the 1st surface of the glass plate 10a. In this case, the surface facing the display surface is the second surface of the glass plate 10a.

In addition, it is preferable for the following reasons that the thickness of the end surface 13 of the glass plate 10a which comprises the curved glass 10 is small. By making thickness small, the mass of the glass plate 10a will become small. And the absorbance in the thickness direction of the glass plate 10a is proportional to thickness. Therefore, since the absorbance is made small by reducing thickness, the visible light transmittance in the thickness direction of the glass plate 10a can be improved, and visibility is improved.

The curved glass 10 of the present embodiment may be a glass plate that forms a flat surface in a part. It is preferable that the average thickness of the glass plate which comprises a curved surface is 5 mm or less. It is more preferable that the average thickness of the glass plate which comprises the curved glass 10 is 3 mm or less, and it is still more preferable that it is 1.5 mm or less from a viewpoint of weight reduction, a viewpoint of sensing, such as a touch panel. On the other hand, in order to maintain an external appearance quality, 0.5 mm or more is preferable and, as for the average thickness of a glass plate, it is more preferable that it is 0.7 mm or more. Moreover, it is preferable that the curved glass 10 of this embodiment has little variation in the thickness in the curved surface of a glass plate, since the dispersion | variation, such as the transmittance | permeability of a glass plate, is suppressed and visibility is improved.

<Glass plate cutting device>

2 is a view for explaining the glass plate cutting device 200 used in the present invention. The glass plate cutting device 200 supports the glass plate 205 to the base 61, and aims at cutting the glass plate 205 to a desired shape by the cutter tool 43 or the grindstone 47. As shown in FIG. The material of the grindstone 47 may be metal or resin may be sufficient as it. The base 61 has a positioning pin (not shown) which positions the glass plate 205, and a positioning pin suppresses the position shift which arises when cutting the glass plate 205. FIG. The cutter tool 43 or the grindstone 47 is fixed to the collet chuck 83, and the glass plate 205 is made possible by making the main axis 41 which supports the collet chuck 83 horizontally movable in the X-axis or Y-axis direction. Cut to the desired shape. The glass plate 205 by performing the scribing process of forming a cutting line in the glass plate 205 by the cutter tool 43 connected to the main shaft 41, and replacing the cutter tool 43 with the grindstone 47. The halo cutting process is performed.

In this specification, the vertical direction which is the axial direction of the main axis | shaft 41 shown in FIG. 2 is a Z-axis direction, the paper vertical direction of FIG. 5 is a Y-axis direction, and the left-right direction of FIG. 2 orthogonal to a Y-axis and a Z-axis is X. It is in the axial direction. Moreover, let the rotation axis of the main shaft 41 be a (theta) axis.

The cutter tool 43 can be selected according to the property of the glass plate 205 to cut | disconnect, for example, you may use a cutter wheel, a cutter pin, and a diamond tip. Specifically, Penett (registered trademark), APIO (registered trademark) manufactured by Mitsubishi Diamond Industry, a carbide cutter, or the like can be used. However, it is preferable to use a cutter wheel because it is inexpensive, has abundant track record of cutter cutting technology, and is excellent in that it is possible to easily optimize the conditions for forming cutting lines and reduce chipping generated in the glass plate. .

It is preferable that the cutting edge angle (alpha) which is the opening angle of the inclined surface of the axial direction both sides of a circumferential ridge of a cutter wheel is 100-160 degrees, More preferably, it is 110-150 degrees, More preferably, 115-145 degrees. As for the thickness of the glass plate 205, the blade whose blade edge angle is small is preferable, and as for the thickness of the glass plate 205, the blade which has a large blade edge angle is preferable.

When the glass plate of thickness 0.7-3mm is shape | molded and a curved surface shape is given, a slight plate thickness deviation generate | occur | produces, but even if a plate thickness deviation arises, the cutting edge angle (alpha) which can form a highly accurate cutting line is 120-145 degrees. In addition, the turning position around the θ axis is controlled by the drive of the main shaft 41 so that the cutter tool 43 faces the machining feed direction at the time of machining.

The glass plate cutting apparatus 200 is equipped with the auto tool changer 57 in an apparatus. When the cutter tool 43 is replaced with the grindstone 47 by the auto tool changer 57, the work time required for the exchange with the grindstone 47 can be shortened, and the halo on the glass plate 205 can be carried out more efficiently. Ying cutting process can be performed.

The auto tool changer 57 rotates and axially moves a pair of arms 91 each having a tool holding portion for holding a tool at its distal end and a pair of arms 91 about an axis 93. The exchange drive part 95 which implements this is provided. The cutter tool 43 held by the collet chuck 83 of the main shaft 41 at the retracted position indicated by the dotted line in the figure becomes detachable by the exchange drive unit 95. In other words, the auto tool changer 57 can selectively attach and detach a desired tool from the collet chuck 83 among a plurality of tools prepared in a tool stocker (not shown), so that tool replacement of the collet chuck 83 can be performed. Do it automatically. For example, when carrying out the cutting of cutting by the grindstone 47, the cutter tool 43 and the grindstone 47 are exchanged quickly by holding the grindstone 47 in a tool stocker.

The grindstone 47 connected to the main shaft 41 performs a halo cutting process of halo-cutting the glass plate 205. It is preferable that the grindstone 47 is provided with two or more types according to the required processing precision. Initially, the eyes are processed into coarse grindstones, and the eyes are gradually processed into fine grindstones, thereby finishing with desired surface properties. Alumina, cBN (cubic boron nitride), green carbide, diamond, etc. can be used as a material of a coarse grindstone, It is preferable that a material is a diamond from the point of grinding property and hardness. As the roughness of the grindstone, the # 80 to # 400 are preferable, and the # 100 to # 350 are more preferable.

In addition, the glass plate 205 can be stress-cut by applying stress to the glass plate 205 and breaking it along the cutting line formed by the cutter tool 43. In addition, you may perform the outer peripheral finishing process of the cut end surface 45 of the glass plate 205 by the grindstone 47 connected to the main shaft 41.

It is preferable that the glass plate cutting device 200 is a machine tool, such as a multi-axis machining center numerically controlled by a computer. By numerical control by a computer, a series of operation | work of the glass plate cutting process including positioning of the glass plate 205 and outer periphery finishing can be performed stably.

<Cutting process of glass plate>

3 (A) and 3 (B) are flowcharts showing a cutting step of cutting the glass plate 205 by the method of the present invention. FIG. 3 (A) shows a case in which a halo cutting is first performed on the glass plate 205 using the grindstone 47, and then a cutting line is formed by scribing. FIG. First, the cutting line is formed by scribing, and the case of halo cutting using the grindstone 47 is shown. When halo cutting using the grindstone 47, it is preferable to spark out for several seconds from an end point. Sparking out is the operation | work performed at the last stage of grinding, and means that grindstone is rotated without giving an incision, and processing continues until the flame and grinding sound by grinding disappear.

When stress cutting is performed along the cutting line after the halo cutting by the grindstone 47 or after scribing, the stress cutting is performed by applying bending stress or thermal stress. The pressure may be broken using an adjustable pressure means, or may be broken by hand or by heating by a laser.

In the case of cutting the glass plate, the step of slowing down the tact time is often the detachment of the glass, the incurve or the outcurve, or other peripheral finish processing. This is the same also when processing curved glass. Since the present invention shortens the time required for incurve or outcurve processing, it greatly contributes to improving the tact time of the entire stroke.

FIG. 4 (A) is a diagram for explaining a method of cutting the curved glass 10 using a conventional cutting method of a glass plate, and arrow I (dotted and dotted line) indicates the cutting direction. In the conventional cutting method of glass, the curved glass 10 is cut and cut using the grindstone 47 like FIG. 4 (A). The machining center equipped with the grindstone 47 moves along a predetermined path, carrying out the halo cutting of a glass plate at a predetermined speed | rate.

4 (B) is a diagram for explaining a method of cutting the curved glass 10 using the cutting method of the glass plate of the present invention. The cutting method of the glass plate of this invention is the scribing process of scribing curved glass 10, and forming a cutting line, the halo cutting process of halo-cutting the curved glass 10, and the curved glass 10 A glass plate is processed by the stress cutting process of carrying out stress cutting along the cutting line. Arrow I has shown the case of carrying out the cutting of the curved surface using the grindstone 47, and arrow II (broken line) has shown the case of scribing a curved surface, and forming a cutting line. Regarding the order of arrows I and II, the curved glass 10 can be cut at high precision and at high speed. Since the distance cut by the cutting method of the glass plate of this invention becomes short compared with the distance cut by the conventional grindstone 47, the required processing time is shortened.

In addition, in the cutting of cutting by arrow I, the cutting of cutting is performed so as to form a gap of at least 0.5 mm between the glass piece to be broken and the glass plate. In the case of breaking a glass plate having a small radius of curvature, the gap can be increased to prevent contact of the glass at the time of stress cutting.

4 (C) is a diagram for illustrating a procedure of cutting using the cutting method of the glass plate of the present invention including the step of penetrating the glass plate by dot processing. According to the present invention, a scribing step of scribing curved glass 10 to form a cutting line, a step of forming a gap in the curved glass 10 by through processing, and a cutting line of curved glass 10 A glass plate is processed by the stress cutting process of stress cutting accordingly. Arrow I and the working trace III of FIG. 4 (C) are gaps formed by dot processing, and arrow I is a gap formed by dot processing of arrow I of FIG. 4 (B) mentioned above. In addition, as for the processing mark III, even if the intersection of the cutting line formed by scribing did not fully cross | intersect, the intersection can be processed smoothly auxiliaryly. Also by the point processing, the clearance gap which glass of both sides of the cutting line which is necessary at the time of stress cutting does not contact is manufactured, and contact of glass can be prevented.

<Scribing>

FIG. 5: is explanatory drawing which shows the positional relationship with the base 61 of the cutter tool 43 in the scribing of the glass plate 205. FIG.

When the cutter tool 43 is moved along the predetermined line of the cutting line by driving the spindle movement stage 55 in a state where the glass plate 205 is positioned on the base 61, the cutting line 87 is formed on the glass plate 205. Is formed. It is preferable that the groove depth of the cutting line 87 shall be 5% or more and 20% or less of the thickness of the glass plate 205. By setting it as the groove depth, it becomes the depth of scratches suitable for glass cutting, and can suppress the cleavage at the unwanted position of the glass plate 205.

On the other hand, scribing can also be carried out using alternative means such as cutter tool 43, pulsed laser, or thermal stress.

<Cutting halo>

6: (A) is explanatory drawing which shows the positional relationship with the base 61 of the grindstone 47 in the halo cutting of the glass plate 205. FIG.

As shown in FIG. 6 (B), the glass plate 205 supported by the base 61 is cut and cut so as to form a gap d so that no contact occurs between the glass plate and the glass piece to be broken. The gap d becomes the shortest distance between two cut sections formed by the rowing cut. The gap d is a distance at which the glass on both sides of the cut surface does not contact, preferably at least 0.1 mm or more, and more preferably 0.5 mm or more. In the case where the glass is broken in the direction perpendicular to the bending direction of the glass plate 205, the gap d is preferably formed wider as the average curvature radius of the glass plate 205 is smaller. By doing so, the cut surface close to a mirror surface can be formed by the stress cutting mentioned later, suppressing the contact with the glass piece to be broken when breaking the glass plate 205. Moreover, as shown to FIG. 6 (A), it is preferable that the base used by a halo cutting has the groove | channel 32, and the grindstone 47 has a structure which does not interfere with a base. Also in the case of the hollow cutting by point processing, it is preferable to have the groove | channel 32 as a structure of a base.

On the other hand, the halo cutting can also be carried out by alternative means such as high pressure water, blown, pulsed laser.

<Stress cutting>

7 is a process explanatory diagram showing a procedure of stress cutting. As shown in FIG. 7, the glass plate 205 fixed on the base 61 is broken by giving stress. It is good also as a structure which can carry out the process of carrying out the stress cutting in the state which supported the base plate 61 with the glass plate 205 which formed the cutting line by scribing.

Since the stress cutting can be performed independently of the main shaft 41 side after the cutting line processing, the required time from the completion of the cutting line processing to the start of the cutting of the cutting line may be short, and the tact time required for processing can be improved. Moreover, since stress cutting comprises the glass plate cutting device 200 by the machining center generally used, curved glass can be processed at low cost with high production efficiency. In this case, it is efficient to perform cutting line processing and stress cutting by scribing in the same apparatus, for example, it is preferable to place a glass plate in the machining center mentioned above, and to implement it.

In addition, since cutting lines are formed using a cutter wheel with abundant track record of cutting by using a cutter, abundant data can be used to easily optimize cutting line processing conditions, thereby reducing chipping generated on a glass plate. have. As a result, high cutting surface quality is stably obtained at low cost.

Moreover, according to the glass plate cutting device 200 mentioned above, since the glass plate 205 can be broken after forming an appropriate clearance | interval by a halo cutting, it is especially effective when the glass plate 205 has a curved surface.

On the other hand, stress cutting can also be performed by applying bending stress or thermal stress.

Although the feed speed in the XY plane at the time of forming a cutting line by scribing actually depends also on the acceleration of a facility, in a linear part, it is preferable to set the maximum feed rate to 20000 mm / min, and it is 5000 10000 mm / min is more preferable. This is to give priority to shortening the processing time since stable continuous processing is possible in the long straight portion and the decrease in processing accuracy is small even if the feed speed is increased. On the other hand, in a curved part, it is preferable to set it as 10000 mm / min, and, as for the maximum feed rate, 1000-5000 mm / min is more preferable. This is because the effect of increasing the processing speed is hardly obtained in the short straight portion and the processing speed dependence of the processing precision is high in the curved portion, so that priority is given to obtaining stable processing quality. The speed of a straight part and a curved part can be set in the range which can exhibit the acceleration of equipment to the maximum according to the travel distance at the time of cutting | disconnection. For example, when the glass plate 205 is 500 mm x 400 mm, it can set about 5000 mm / min about a linear part, and about 1000-2000 mm / min about a curved part.

You may finish-process the cutting edge 45 of the glass plate 205 cut | disconnected by the above-mentioned splitting process by the grindstone 47 driven to rotate. After completion of the outer circumferential finishing step, the glass plate 205 is separated. The processing of the glass plate 205 is completed above.

As mentioned above, this invention is not limited to the said embodiment, The present invention also intends that a person skilled in the art changes and applies, combining each structure of embodiment, based on description of a specification, and well-known technique. It is included in the range which requires protection.

Example

First, commercially available plate glass (product name: Dragontrail (registered trademark), manufactured by AGC Corporation, width 220 mm, length 650 mm, plate thickness 2.0 mm) was prepared. The prepared plate glass was heated to 720 degreeC, it softened, it shape | molded by self-weight bending so that it could fit into the prepared metal mold | die, and the curved glass (glass plate 205) was produced. The radius of curvature of the produced curved glass was 1750 mm.

Next, the glass plate 205 was mounted on the base 61, and the glass plate 205 was positioned by the positioning pin. In the state which confirmed that the glass plate 205 was fixed, the grindstone 47 was attached to the machining center, and the halo cutting was performed. The grindstones 47 are all commercially available grindstones (# 100P, # 325M, manufactured by Tokyo Diamond Tool Manufacturing Co., Ltd., # 200M, manufactured by Noritake Co., Ltd., all materials are single crystal diamond (C)), and a glass plate (205). The relationship between the feed rate and the chipping was measured while the hauling cutting of) was performed.

Next, the grindstone 47 was replaced with the cutter tool 43 by the auto tool changer 57, it moved while pressing the cutter tool against the glass plate 205, and scribing was performed. The cutter tool used was a commercially available cutter wheel (Cutter varieties: Penett (registered trademark) -SC (made by Mitsubishi Diamond Industry), wheel outer diameter 3 mm, wheel thickness 0.65 mm, wheel inner diameter 0.8 mm, blade tip angle 115 °). It was.

After scribing, stress cutting was performed by bending by hand along the cutting line formed in the glass plate.

Table 1 shows the results of cutting the glass plate 205 under the above conditions. In addition, in Table 1, the unit of grindstone diameter phi is (mm). If the size of the chipping caused by the hauling cut by the grindstone and the size of the chipping caused by the stress cutting were compared, the chipping generated by the former could be carried out using a # 100, grindstone with a diameter of φ3 mm and a rotational speed of 25000 rpm and a feed rate of 200. Although it was about 0.8 mm at mm / min, the magnitude of the chipping caused by the stress cutting after scribing was about 0.2 mm. As a result of measuring the size of the chipping by changing the diameter of the grindstone and the type of the grindstone, the chipping size was 0.5 when the grinding wheel of # 200 and the grindstone diameter φ4 mm was cut at a rotational speed of 25000 rpm and a feed rate of 200 mm / min. It is mm. Moreover, when halo cutting 325 and a grindstone having a grindstone diameter φ4 mm at a rotation speed of 50000 rpm and a feed rate of 400 mm / min, the chipping size is reduced to 0.2 mm, and 325 rotates the grindstone having a grindstone diameter of φ4 mm. By halo cutting at several 50000 rpm and a feed rate of 200 mm / min, the size of the chipping is reduced to 0.1 mm. The rotation speed of a grindstone can be raised by driving a high speed spindle with electricity or compressed air.

Although the shape of the cut end surface 45 is the cut end surface 45 cut | disconnected by the halo cutting, the smooth cross section like the cut end surface 45 by stress cutting by adjusting a grindstone diameter, the rotation speed of a grindstone, and a feed rate Getting closer to In other words, when the glass is cut under the conditions of small chipping, and the glass plate is further cut by stress cutting after scribing, a smooth cut cross section is provided while having a cover glass or a curved surface having a complex shape such as an incurve. It becomes possible to manufacture the cover glass which has. In addition, the magnitude | size of chipping is measured with a stereomicroscope or a microscope, and takes the average value of the deviations. The minimum value of chipping that can be measured by the microscope is 0.01 mm.

In addition, when the incurve was cut | disconnected and formed only by the halo cutting (feed rate 200 mm / min, total travel distance 1000 mm) with respect to the curved glass 205, the time required was about 300 sec (Table 2), Using the present invention, the time required for cutting and forming an incurve on curved glass is 200 sec (the time required for the cutting of cutting is about 60 seconds at two sides, and the required time is about 140 even if the scribing and the stress cutting are combined. Seconds), the tact time is greatly improved.

Moreover, as shown in Table 2, when this invention was implemented using the grindstone of the grindstone diameter # 200, it turned out that the incidence of the crack which becomes a starting point of fracture is smaller than the grindstone of other grindstone diameter. By selecting the grinding wheel with a small frequency of cracks, manufacture of the cover glass with a low possibility of breaking becomes possible.

Next, according to the procedure shown to FIG. 4 (B), after scribing the curved glass manufactured on the same conditions as the above-mentioned Example, a hollow cutting is performed using the grindstone 47, and stress cutting is performed. Was carried out. At this time, the grindstone 47 used the # 20 metal grindstone (grindstone diameter φ4mm) and the # 100 electrodeposition grindstone (grindstone diameter φ3mm).

In the metal grindstone (grindstone diameter φ4 mm) of ＃ 200, the gap is 4 mm, and in the electrodeposited grindstone (grindstone diameter φ3 mm) of ＃ 100, the gap is 3 mm, and both pieces are curved and broken at the time of stress cutting. There was no contact of the glass between the glasses. By forming a sufficient gap, it becomes possible to cut stress with a margin even in curved glass having a small radius of curvature. The gap width is appropriately adjusted according to the plate thickness and the radius of curvature of the curved glass.

In addition, in the Example, although the scribing process was performed after the halo cutting process in a glass cutting process, the halo cutting process and the scribing process were changed suitably according to the property of a glass plate or a cutting line, and the stress at the time of splitting. Alternatively, the hauling cutting step and the scribing step may be performed alternately.

Although curved glass was used as a glass plate in the Example, flat glass may be sufficient as a glass plate, and glass which has a curved surface may be sufficient as it.

This application is based on the JP Patent application 2018-154618 of an application on August 21, 2018, The content is taken in here as a reference.

10: curved glass
10a: glass plate
11: first side
12: second side
13: cross section
32: home
41: spindle
43: Cutter Tool
45: cutting cross section
47: grindstone
55: spindle movement stage
57: auto tool changer (tool changer)
61: expect
83: Collet Chuck
87: cutting line
91: arm
95: exchange drive unit
Ⅱ: Cutting line
200: glass plate cutting device
205: glass plate
d: gap

Claims (10)

As a cutting method of cutting a glass plate,
The cutting method,
A scribing step of forming a cutting line by scribing;
Halo cutting process to cut halo,
It has a stress cutting process of carrying out the stress cutting along the said cutting line, The cutting method of the glass plate characterized by the above-mentioned. The method of claim 1,
The said cutting cutting process is a point processing, The cutting method of a glass plate. The method of claim 1,
The said scribing process is a cutting method of the glass plate which is performed by any of a cutter wheel, a diamond tip, a pulse laser, or a thermal stress. The method of claim 1,
The said hollow cutting process is a cutting method of the glass plate which carries out by the grindstone which driven the high speed spindle by electric or compressed air. The method of claim 1,
The said hollow cutting process is a cutting method of a glass plate performed by any of high pressure water, melt | fusion, or a pulse laser. The method of claim 1,
The said stress cutting process is a cutting method of a glass plate performed by applying bending stress or a thermal stress. The method of claim 1,
The said scribing process and the said halo cutting process are performed by the same apparatus. The method according to any one of claims 1 to 7,
The said glass plate is a glass plate which has a curved surface, The cutting method of a glass plate. The method of claim 8,
The glass plate which has the said curved surface has the curved surface which is short or a curved, The cutting method of a glass plate. As a glass plate cut | disconnected by the glass plate cutting device,
The glass plate is a glass plate having a curved surface,
The glass plate whose magnitude | size of the chipping which generate | occur | produced at the time of a cutting is the range of 0.01-0.4 mm.

Images