JP2002113697A - Cutting method and cutting device for workpiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting method for a workpiece and a cutting device using this method capable of cutting the workpiece into small cutting widths. SOLUTION: A cutout 1a is formed on an outer circumferential face of the workpiece 1 comprising brittle material, the workpiece 1 is fitted in a side pressure transmission cylinder 6, and the side pressure transmission cylinder 6 with the workpiece 1 fitted inside is accommodated in a cutting container 5 having a pressure chamber 5a for accommodating the side pressure transmission cylinder 6 and a pressure medium entering hole 5b communicating an interior and an exterior of the pressure chamber 5a. The outer circumferential face of the workpiece 1 is pressurized via the side pressure transmission cylinder 6 by introducing a pressure medium 8 inside the cutting container 5 and the workpiece 1 is cut by using the cutout 1a as a starting point. At this point, a cutting signal of the workpiece 1 is detected by a detector 10 arranged near the side pressure transmission cylinder 6, and pressure is reduced right after cutting of the workpiece 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating and cutting brittle materials such as glass, silicon, quartz, sapphire and the like, and a cutting apparatus used for the cutting method.

[0002]

2. Description of the Related Art Conventionally, there is a side pressure cutting method as a method for separating and cutting a brittle material. FIG. 6 is a schematic view of an apparatus used in the lateral pressure cutting method, and illustrates a workpiece 101 for cutting.
Is arranged. First, the configuration of this device will be described. As shown in FIG. 6, a side pressure transmission tube 103 is disposed in the cutting container 102, and an O-ring 104 is disposed between both ends of the side pressure transmission tube 103 and the cutting container 102. Further, a workpiece 101 made of a brittle material having a rod shape (for example, a column shape) is arranged inside the side pressure transmission cylinder 103. A notch 101a is provided at the cut portion of the workpiece 101.
Is provided.

When the workpiece 101 is cut, a pressure medium is supplied from a pressure device 105 through a hole 102a formed in the cutting container 102 via a pipe 106 to the cutting container 10.
2 is introduced. As a result, the workpiece 101 is pressurized and compressed from the outer peripheral side of the side pressure transmission cylinder 103 in a state where it can be deformed in the axial direction, and the notch is formed by utilizing the internal tensile stress in the axial direction of the workpiece 101 due to the compressive deformation of the workpiece 101. The workpiece 101 is cut at a portion 101a.

[0004] This side pressure cutting method requires that the cutting margin is completely unnecessary and that the processing time is extremely short due to the splitting.
Also, a tool (a grindstone or the like) for mechanically cutting the workpiece 101 is not required.

[0005]

However, this side pressure cutting method has a problem that the thickness of cutting a workpiece cannot be reduced. FIG. 7 shows a time change of the pressure applied to the side pressure transmission cylinder 103 in this side pressure cutting method.

As shown in FIG. 7, the workpiece 101 is cut by a pressure cycle of increasing the pressure, maintaining the pressure at a desired pressure for a certain period of time, and then reducing the pressure. Here, the set time of each of the pressure increase, the holding, and the pressure reduction is determined by the work 10
1 and the width and depth of the notch 101a.

At this time, it is unknown at which stage of the pressure cycle the workpiece 101 was cut. Therefore, the pressure of the workpiece 101 is set so high that the workpiece 101 can be surely cut with reference to experimental values and empirical values.
Disconnect.

Further, the cutting environment is liable to change.
The width and depth of 01a are easy to change. Generally notch 1
01a is formed using a diamond cutter or the like,
It is easily affected by the wear of the diamond tip and the surface condition of the workpiece 101. In addition, when performing various small-quantity productions in which the type of the workpiece 101 and the cutting thickness of the workpiece 101 constantly change, the cutting environment changes significantly.

For this reason, the maximum pressure in FIG. 7 is set to the maximum value of the variation range due to the change in the cutting environment as described above, or set to a higher value in order to ensure that the workpiece 101 is cut. I was Further, for the same reason, the pressurizing time is set longer.

In general, when cutting a workpiece thinly, buckling occurs in the workpiece only when the pressure setting is shifted from the optimum value by several hundred thousand Pa (several kgf / cm ² ). In addition, buckling occurs if the pressurizing time is several seconds longer than the optimum time. Therefore, in such a conventional pressure cycle, the workpiece 1
01 is difficult to cut thin.

For example, FIG. 8 is a perspective view of a workpiece 101 when a cylindrical soda glass having a diameter of 25 mm and a length of 30 mm is cut at intervals of 0.5 mm. FIG. 8A shows a state before the workpiece 101 is cut, and FIG. 8B shows a state after the workpiece 101 is cut. As shown in FIG. 8, after the workpiece 101 is cut into a thin shape, the workpiece 101 is buckled by excessive pressure.

The minimum cutting width of the workpiece 101 that can be cut by the conventional lateral pressure cutting method is about 1/10 of the width of the workpiece 101 in the direction perpendicular to the axis.
mm cylindrical glass can only be cut to a width of at least about 1 mm. Therefore, a thick workpiece 10
The cutting width becomes thicker as the number 1 is cut. When the cutting width becomes large, grinding or the like must be performed in a post-process so as to obtain a desired thickness.
In 01, a useless portion occurred.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a method for cutting a workpiece, which can cut the workpiece to a small cutting width, and a cutting apparatus used in the method.

[0014]

In order to achieve the above object, according to the first aspect of the present invention, a flaw (1a) for designating a portion to be cut is provided on an outer peripheral surface of a workpiece (1) made of a brittle material. In a cutting method for cutting a workpiece by pressing the outer peripheral surface of the workpiece, a cutting signal generated when the workpiece is cut when the workpiece is pressed is measured, and after confirming the cutting signal, the workpiece is checked. Is characterized in that the pressing force on the outer peripheral surface of is reduced.

[0015] With this, it is possible to reduce the pressurization of the workpiece after the workpiece is cut, so that the buckling of the workpiece can be suppressed even if the width of the workpiece is small. Therefore, the workpiece can be cut to a small cutting width.

In this case, for example, as in the second aspect of the invention, the pressurizing of the outer peripheral surface of the workpiece is performed by fitting the workpiece into the side pressure transmitting cylinder (6) and applying pressure from the outer peripheral side of the side pressure transmitting cylinder. It can be done by doing.

According to a third aspect of the present invention, in the first or second aspect of the invention, when the number of cutting signals reaches a preset number, the pressure applied to the outer peripheral surface of the workpiece starts to decrease. It is characterized by:

When a workpiece is cut into a plurality of pieces, a plurality of cutting signals may be generated. In this case, if the pressure reduction is started immediately after the detection of the cutting signal, there is a portion of the workpiece that is not cut. Therefore, if the pressure reduction of the workpiece is started after detecting the expected number of cutting signals, the desired number of cuttings can be performed.

In this case, if the number of cutting signals is different from the preset number because a plurality of cuttings occur simultaneously and a plurality of cutting signals overlap, the cut workpiece is continuously pressed and buckled. There is fear.

Therefore, as in the invention according to claim 4,
After detecting the cutting signal and starting to reduce the pressing force on the outer peripheral surface of the workpiece after a preset time has elapsed, the buckling of the cut workpiece can be reduced.

According to the fifth aspect of the present invention, as in the first aspect,
Vibration can be used as the disconnection signal according to any one of the first to fourth aspects.

In this case, the vibration of the pressure applying means (2) for applying pressure to the outer peripheral surface of the workpiece is suppressed more than the vibration generated when the workpiece is cut. Thus, it is possible to suitably detect the cutting signal of the workpiece and suppress the buckling of the workpiece.

According to a seventh aspect of the present invention, in the first to sixth aspects of the present invention, an opening valve (13) is provided in the pressure applying means (2) for applying pressure to the outer peripheral surface of the workpiece. By opening the release valve when reducing the applied pressure on the outer peripheral surface of the workpiece, the applied pressure on the outer peripheral surface of the workpiece can be rapidly reduced.

The invention according to claim 8 is a pressure applying means for applying pressure to an outer peripheral surface of a workpiece (1) made of a brittle material having a flaw (1a) for designating a portion to be cut on the outer peripheral surface. 2) a detector (10) for detecting a cutting signal generated when the workpiece is cut by being pressurized; and a detector for adjusting the pressure applied to the workpiece according to a signal from the detector. A pressure adjusting means (11).

Thus, a workpiece cutting apparatus suitable for use in the method for cutting a workpiece according to the first aspect can be provided.

In this case, a detector which detects vibration generated when the workpiece is cut as a workpiece cutting signal may be used as the detector. it can. Further, when the vibration of the pressure applying means is smaller than the vibration generated when the workpiece is cut, a cutting signal of the workpiece can be suitably detected. .

Also, as in the invention according to claim 11,
In the invention of claims 8 to 10, specifically, the detector can be arranged so as to be in contact with the workpiece.

Further, according to the invention of claim 12,
When the pressure applying means provided with an opening valve (13) for releasing the pressure applied to the outer peripheral surface of the workpiece is used, the opening valve is opened to open the work. The object can be depressurized.

Further, as in the invention according to claim 13,
In the invention of claims 8 to 12, if at least one of the detector and the pressure adjusting means is provided with a measuring function for measuring the number of cutting signals of the workpiece, the method of cutting a workpiece according to the invention of claim 3 is preferable. Can be done.

In order to concretely carry out the cutting method according to the third aspect of the present invention, as in the invention according to the fourteenth aspect, the number of cutting signals of the workpiece is compared with a predetermined number in the pressure adjusting means. It is preferable to provide a function of issuing a signal for reducing the pressing force on the outer peripheral surface of the workpiece when the values become the same.

According to a fifteenth aspect of the present invention, in the invention of the eighth to fourteenth aspects, after detecting a cutting signal of the workpiece by the pressure adjusting means, a predetermined time elapses and the outer peripheral surface of the workpiece is evacuated. By providing a function of issuing a signal for reducing the applied pressure, the method for cutting a workpiece according to the invention of claim 4 can be suitably performed.

Further, in the inventions of claims 8 to 15, as in the invention of claim 16, as the pressure applying means,
A side pressure transmission cylinder (6) into which a workpiece is fitted, and a cutting container (5) formed with a room (5a) containing the side pressure transmission cylinder and having a hole (5b) communicating the inside and the outside of the room. Those provided can be used.

According to the eleventh aspect of the present invention, when the detector is arranged so as to be in contact with the workpiece, when the workpiece is cut into a plurality of pieces, the detector is located on the side opposite to the detector with the cut workpiece interposed therebetween. If you try to detect the cutting of a workpiece that is far away, the cut workpiece will block the propagation of the cutting signal,
It may be difficult for the detector to detect the disconnect signal.

Therefore, according to the present invention, the detector is disposed in the cutting container and the cutting signal of the workpiece transmitted to the side pressure transmission cylinder is detected, so that the cutting signal of the workpiece is preferably obtained. Can be detected.

The reference numerals in parentheses of the above means indicate the correspondence with the specific means described in the embodiments described later.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) The embodiment shown in the drawings will be described below. In this embodiment, the present invention is applied to lateral pressure cutting. FIG. 1 is a schematic view of a lateral pressure cutting device according to the present embodiment, in which a workpiece 1 to be cut is arranged. As shown in FIG. 1, the pressure applying means 2 has a pressure device 3, a pressure device 4, and a pipe 7 connecting them.

The pressurizing device 3 comprises a cutting vessel 5 and a side pressure transmitting cylinder 6. The cutting container 5 is made of a hollow member made of a material capable of withstanding high pressure, and a hollow portion of the cutting container 5 forms a cylindrical pressure chamber (room) 5a. Further, the cutting vessel 5 is formed with a pressure medium entry hole 5b, which is a hole communicating the inside and the outside of the pressure chamber 5a.

A pressure device 4 is connected to the pressure medium inlet 5b via a pipe 7. The pressure device 4 is for introducing a pressure medium 8 into the cutting vessel 5 as described later. Although not shown, an opening valve for releasing pressure is provided in the pressure device 4. Pressure chamber 5
The side pressure transmission cylinder 6 is arranged at a. The side pressure transmitting cylinder 6 is made of an acrylic resin or the like, and is used to apply pressure to the outer peripheral surface of the workpiece 1 when cutting the workpiece 1 as described later.

An O-ring 9 is arranged between both ends of the side pressure transmission cylinder 6 in the axial direction and the cutting container 5. When the pressure medium 8 is filled into the cutting container 5 as described later, the O-ring 9 leaks to the both ends of the workpiece 1 when the pressure medium 8 leaks, and the O-ring 9 This is for preventing the application of pressure that shrinks in the axial direction.

Then, the workpiece 1 made of a brittle material is disposed in the side pressure transmission cylinder 6 and the workpiece 1 is cut. As the workpiece 1, for example, a bar-shaped workpiece can be applied. In the present embodiment, the diameter is 25 mm and the length is 30 m.
Cut the cylindrical soda glass of m.

A notch 1a is formed on the outer peripheral surface of the workpiece 1 to designate a portion to be cut. Notch 1a
It is formed in a part of the outer edge portion in a region to be the cut surface of the workpiece 1, and in the present embodiment, ten are formed at 0.5 mm intervals. The notch 1a can be formed by, for example, a diamond cutter.

The workpiece 1 is located in the vicinity of the outer peripheral surface of the side pressure transmission cylinder 6, that is, in a position in the cutting vessel 5 where a cutting signal of the workpiece 1 transmitted to the side pressure transmission cylinder 6 can be detected.
Is provided with a detector 10 for detecting a disconnection signal generated when is disconnected. Detector 10 of the present embodiment
Is designed to detect vibration generated when the workpiece 1 is cut. As the detector 10, for example, an acoustic emission sensor can be used.

In general, a hydraulic device is often used in the pressure device 4 to supply the pressure medium 8 to the cutting vessel 5, and the vibration of the hydraulic device hinders the detection of the vibration generated when the workpiece 1 is cut. May come. Therefore,
As the pressure device 4, a device whose vibration is suppressed more than vibration generated when the workpiece 1 is cut is used.

Further, the pressurizing device 3 is provided with a pressure control section (hereinafter simply referred to as a control section) 11 as pressure adjusting means for adjusting the pressure applied to the workpiece 1 in accordance with a signal from the detector 10. Have been.

Next, a method of cutting the workpiece 1 will be described. As shown in FIG. 1, the workpiece 1 in which all the notches 1 a are formed is arranged in the side pressure transmission cylinder 6, and the portion including the notch 1 a is covered with the side pressure transmission cylinder 6. Then, using the pressure device 4, the pressure medium 8 is inserted into the cutting vessel 5 through the pressure medium entrance hole 1 b.
To fill the space between the cutting vessel 5 and the side pressure transmission cylinder 6 with the pressure medium 8. The pressure medium 8 allows the side pressure transmitting cylinder 6
Is pressurized and compressed, a stress is applied to the workpiece 1, and the workpiece 1 is cut starting from the notch 1a.

FIG. 2 shows a change in pressure in the side pressure transmitting cylinder 6 and a change in vibration of the workpiece 1 detected by the detector 10 when cutting is performed in this manner. In FIG. 2, the cutting of the workpiece 1 is performed when the vibration of the workpiece 1 sharply increases. In the graph showing the pressure change in FIG. 2, the pressure change in the present embodiment is indicated by a thick line, and the pressure change in the related art is indicated by a broken line. In addition, there is only one cutting signal of the workpiece 1, which indicates that the cutting of 10 parts in the workpiece 1 was performed simultaneously.

As shown in FIG. 2, the pressure of the pressure medium 8 is gradually increased. As a result, the workpiece 1 is cut,
A cutting signal that is a large vibration is detected by the detector 10. This signal is transmitted to the control unit 11, and an instruction is transmitted from the control unit 11 to the pressure device 4. With this instruction, the release valve is opened, the pressure of the pressure medium 8 in the cutting vessel 5 is reduced, and the pressure on the outer peripheral surface of the workpiece 1 is reduced. Less than,
This decrease in pressure is simply referred to as pressure reduction.

This reduced pressure, as shown in FIG.
0 is performed immediately after (at substantially the same time) a cutting signal of the workpiece 1 is detected. Even if the same amount of pressure is applied to the workpiece 1, the buckling may not be caused by short-time application and may be buckled by long-time application. Seem. The faster the pressure reduction rate, the shorter the cutting time, which is preferable. Therefore,
In this embodiment, the opening valve is opened at a stretch to reduce the pressure.

By such a cutting method, the workpiece 1 shown in FIG.
As shown in the perspective view of FIG. 2, the workpiece 1 provided with the notch 1a as shown in FIG.
It was possible to cut to a cutting width of mm. In addition, no crack or chipping occurred around the cut workpiece 1, and the workpiece 1 could be cut with high quality.

As described above, in this embodiment, the cutting signal of the workpiece 1 is detected so that the workpiece 1 is not pressed after the workpiece 1 is cut. Therefore, even when the cutting width of the workpiece 1 is small, buckling of the workpiece 1 can be suppressed. Therefore, the workpiece 1 can be cut to a small cutting width.

The vibration in the pressure device 4 causes the workpiece 1
Since the vibration generated when cutting the workpiece 1 is suppressed, the cutting signal of the workpiece 1 is suitably detected, and the buckling of the workpiece 1 can be suppressed.

As is apparent from the pressure change graph of FIG. 2, the cutting time can be reduced as compared with the conventional cutting method, and the workpiece 1 can be cut efficiently. By the way, conventionally, it has been general to pressurize for about several tens of seconds after the first cutting of the workpiece (time during which the broken line in FIG. 2 is flat).

It should be noted that, in addition to the pressure device 4, in order to prevent the detection of the vibration generated when the workpiece 1 is cut due to the peripheral vibration, the peripheral vibration is reduced by the vibration generated when the workpiece 1 is cut. It is also preferable to suppress this. Further, it is preferable that the vibration of the entire pressure application unit 2 other than the pressure device 4 is suppressed to be lower than the vibration generated when the workpiece 1 is cut.

The method of reducing the pressure is not limited to opening the opening valve, and a method capable of rapidly reducing the pressure of the pressure medium 8 in the cutting vessel 5 can be applied. For example,
When the pressurization is performed using a cylinder, the cylinder may be moved in a direction opposite to the pressurization.

(Second Embodiment) In the first embodiment,
Although an example in which a plurality of disconnections are performed simultaneously and a disconnection signal is simultaneously detected has been described, the present embodiment shows a case where a plurality of disconnections are performed with a time lag.

Workpiece 1 as shown in the first embodiment.
In the case where a plurality of cuts 1a are provided and the plurality of cuts are simultaneously performed by covering with the side pressure transmitting cylinder 6, if the size and depth of the cuts 1a vary, the pressure at the time of cutting starting from each notch 1a is considered. Differences occur. Therefore, if the pressure is reduced immediately after the detection of the cutting signal, the workpiece 1 cannot be cut in all the notches 1a.

FIG. 4 shows a change in pressure of the pressure medium 8 and a change in vibration of the workpiece 1 when the cutting is performed with a time lag. The workpiece 1 is formed by cutting four notches 1a to form three wafer-shaped workpieces 1 having a small cutting width. In FIG. 4, it is assumed that all the cutting of the workpiece 1 is performed with a time lag. The pressure change of the present embodiment is indicated by a bold line, and the pressure change according to the related art is indicated by a broken line.

In such a case, the detector 10 or the control unit 11
A microcomputer or the like is provided in at least one of them to have a measurement function for measuring the number of cutting signals of the workpiece 1. Also,
The control unit 11 has a function of issuing to the pressure device 4 a signal for reducing the pressure of the workpiece 1 when the number of cutting signals of the workpiece 1 becomes equal to the preset number.

Then, the number of disconnection signals (the same number as the number of notches 1a, which is 4 in this example) is set in advance, and
The decompression is started immediately after the set number of disconnection signals are detected. In the present embodiment, pressure reduction is performed after detecting four control signals.

Thus, a desired number (four in this example) of the workpieces 1 can be cut.

Further, in the case where the cutting of the workpiece 1 does not occur simultaneously as in the present embodiment, the furthest (distant) from the detector 10 on the opposite side of the detector 10 across the previously cut workpiece 1. Attempts to detect the cutting signal of the workpiece 1 at the position) may cause the cut workpiece 1 to impede the propagation of the cutting signal, making it difficult for the detector 10 to detect the cutting signal. .

However, in the present embodiment, the detector 10 is provided in the vicinity of the outer peripheral surface of the lateral pressure transmission cylinder 6 as in the first embodiment. Therefore, the cutting signal can be detected through the side pressure transmission cylinder 6 that faces all of the cut portions of the workpiece 1, so that the cutting signal of the workpiece 1 can be suitably detected.

Note that, as shown in FIG.
The pressurizing speed has been reduced since the disconnection was detected.
This is to make it easier to detect the cutting signal of the workpiece 1 by shifting the cutting time. Also, if the pressurizing speed is high, the cut workpiece 1 is easily buckled, so that this buckling is prevented. The pressing device 3 used for cutting has the same configuration as in the first embodiment.

(Third Embodiment) In the second embodiment, decompression is started after a predetermined number of cutting signals are detected. However, a plurality of cutting signals occur simultaneously and a plurality of cutting signals overlap. If the number of cutting signals is different from the preset number, the cut workpiece 1 may be continuously pressed and buckled.

Therefore, the control unit 11 is provided with a function of issuing a signal for reducing the pressure of the workpiece 1 after a preset time has elapsed after detecting the cutting signal of the workpiece 1. Then, after detecting the cutting signal, the decompression of the workpiece 1 is started after a preset time has elapsed.

As the disconnection signal, the disconnection signal detected first may be used, or after the disconnection signal is detected,
The pressure reduction may be started when there is no disconnection after a set time. The set time can be set to, for example, about 1 second.

Thus, it is possible to reduce the continuation of pressurizing the cut workpiece 1 and reduce the buckling of the workpiece 1.

The set time differs depending on the pressing speed, the type of the workpiece 1, the cutting width, and the like, and is not limited to this value. The length is appropriately set so that the workpiece 1 does not buckle. Good.

(Fourth Embodiment) FIG. 5 is a schematic view of a pressurizing device 3 for a workpiece 1 according to this embodiment. The pressure applying means 2
The pressure device 3 having the same configuration as that of the first embodiment and the pressure lid 12
a pressure vessel 12 having a and containing the pressurizing device 3;
It has various pipes 14a to 14c. The pressure medium 8 is connected to the pressure vessel 12 through a pipe 14 a having an opening valve 13.
Is connected. The tank 15 is connected to a pressure control unit (hereinafter simply referred to as a control unit) 11 as a pressure adjusting unit via a pipe 14b. The control unit 11 is connected to the pressure vessel 12 via a pipe 14c, and the pipe 14c is provided with a pressure detector 16 for measuring the pressure in the pipe 14c and transmitting the measured pressure to the control unit 11.

When the work 1 is cut, the work 1 is placed in the pressurizing device 3 as in the first embodiment, and the pressure vessel 12 is cut.
After the pressurizing device 3 is put in the inside, the side pressure transmitting cylinder 6 in the pressurizing device 3 is pressurized by the pressure medium 8 to cut the workpiece 1. At this time, a cutting signal of the workpiece 1 is detected by a detector 10 arranged near the side pressure transmission cylinder 6 in the pressurizing device 3 and transmitted to the control unit 11. This signal can be transmitted by connecting the detector 10 and the control unit 11 via the pressure vessel 12 by, for example, a wire.

The invention of the first to third embodiments can be applied to such cutting.

(Other Embodiments) In each of the above embodiments, an example in which soda glass is used as the workpiece 1 has been described, but other brittle materials such as silicon, quartz, and sapphire can be cut. Although the shape of the workpiece 1 is shown as being cylindrical, the workpiece 1 may have various other shapes, such as a cylindrical shape, a hexagonal pillar, or a shape in which a part of a side surface is flat in a cylindrical shape. Can be cut.

In each of the above embodiments, the detector 10 is arranged near the side pressure transmission cylinder 6, but may be arranged so as to be in contact with the workpiece 1 at the end face of the workpiece 1. However, in this case, a plurality of cuts are performed with a time lag as described above, and the cut of the workpiece 1 located on the opposite side to the detector 10 across the cut workpiece 1 is detected. Since it is difficult to do so, it is preferable to apply the present invention to a machine with a small number of cuts.

Further, in each of the above embodiments, vibration is detected as a cutting signal of the workpiece 1, but a sound at the time of cutting may be detected. Further, in each of the above embodiments, an example in which the side pressure transmission tube 6 is used has been described. However, the present invention can be applied to a case where the workpiece 1 is cut without using the side pressure transmission tube 6. In this case, for example, a workpiece having one notch is arranged in the pressurizing chamber 5a of the cutting container 5 so that the notch is located immediately below the pressure medium entrance hole 5b. The workpiece can be cut in the same manner as in the above embodiments.

In the second embodiment, an example is described in which the same number of cut signals as the number of cuts 1a are detected. However, all cuts starting from the plurality of cuts 1a are detected with a time lag. The present invention can be applied not only to the case where the cutting is performed but also the case where the cutting is performed simultaneously and the case where the cutting is performed with a time lag. In this case, for example, the number of cutting signals to be set by cutting the workpiece in advance may be determined.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a cutting device according to a first embodiment.

FIG. 2 is a diagram showing a change in pressure and a change in vibration of a workpiece in a lateral pressure transmission cylinder according to the first embodiment.

FIG. 3 is a perspective view of a workpiece according to the first embodiment.

FIG. 4 is a diagram showing a change in pressure and a change in vibration of a workpiece in a side pressure transmission cylinder according to a second embodiment.

FIG. 5 is a schematic diagram of a cutting device according to a fourth embodiment.

FIG. 6 is a schematic view of a cutting device according to a conventional lateral pressure cutting method.

FIG. 7 is a diagram showing a pressure change in a lateral pressure transmission cylinder according to a conventional lateral pressure cutting method.

FIG. 8 is a perspective view of a workpiece according to a conventional lateral pressure cutting method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Workpiece, 1a ... Notch (scratch), 2 ... Pressure application means, 5
... cutting container, 5a ... pressure chamber (room), 5b ... pressure medium entry hole (hole), 6 ... side pressure transmission cylinder, 10 ... detector, 11 ... pressure control unit (pressure adjusting means), 13 ... release valve.

Claims (17)

[Claims] 1. A cutting method for cutting a workpiece by forming a flaw (1a) for designating a portion to be cut on an outer peripheral surface of a workpiece (1) made of a brittle material and pressing the outer peripheral surface of the workpiece. In the method, a cutting signal generated when the workpiece is cut when the workpiece is pressurized is measured, and after confirming the cutting signal, the pressing force on the outer peripheral surface of the workpiece is reduced. How to cut the workpiece. 2. An outer peripheral surface of the workpiece is pressurized by fitting the workpiece into a side pressure transmission cylinder and applying pressure from an outer peripheral side of the side pressure transmission cylinder. 2. The method for cutting a workpiece according to claim 1. 3. The cutting of a workpiece according to claim 1, wherein when the number of the cutting signals reaches a preset number, the pressure on the outer peripheral surface of the workpiece is started to decrease. Method. 4. The method according to claim 1, wherein after detecting the cutting signal, the pressure on the outer peripheral surface of the workpiece starts decreasing after a preset time has elapsed. Cutting method. 5. The method for cutting a workpiece according to claim 1, wherein the cutting signal is a vibration. 6. The method according to claim 1, wherein the vibration of the pressure applying means for applying pressure to the outer peripheral surface of the workpiece is suppressed more than the vibration generated when the workpiece is cut. Item 6. The method for cutting a workpiece according to Item 5. 7. A pressure applying means (2) for applying a pressure to an outer peripheral surface of the workpiece is provided with an opening valve (13),
The method for cutting a workpiece according to any one of claims 1 to 6, wherein the release valve is opened when the pressure on the outer peripheral surface of the workpiece is reduced. 8. A scratch (1) for designating a portion to be cut on the outer peripheral surface.
a) a pressure applying means (2) for applying pressure to an outer peripheral surface of a workpiece (1) made of a brittle material provided with (a); and detecting a cutting signal generated when the workpiece is pressed and cut. And a pressure adjusting means (11) for adjusting a pressure applied to the workpiece according to a signal from the detector. Cutting device. 9. The workpiece according to claim 8, wherein the detector detects a vibration generated when the workpiece is cut as the cutting signal of the workpiece. Cutting device. 10. The work cutting apparatus according to claim 9, wherein the vibration of the pressure applying means is smaller than the vibration generated when the work is cut. 11. The apparatus according to claim 8, wherein the detector is arranged so as to be in contact with the workpiece.
0. The apparatus for cutting a workpiece according to any one of 0. 12. An opening valve (1) for releasing pressure applied to an outer peripheral surface of the workpiece, said pressure applying means being provided with an opening valve (1).
3. The method according to claim 1, wherein 3) is provided.
A device for cutting a workpiece according to any one of the preceding claims. 13. The apparatus according to claim 8, wherein at least one of said detector and said pressure adjusting means has a measuring function for measuring the number of cutting signals of said workpiece.
3. The apparatus for cutting a workpiece according to any one of 2. 14. The pressure adjusting means generates a signal for reducing the pressure applied to the outer peripheral surface of the workpiece when the number of cutting signals of the workpiece becomes equal to the preset number. 2. A function is provided.
3. The apparatus for cutting a workpiece according to any one of 2. 15. The pressure adjusting means has a function of, after detecting a cutting signal of the workpiece, issuing a signal for reducing a pressing force on an outer peripheral surface of the workpiece after a predetermined time has elapsed. The apparatus for cutting a workpiece according to any one of claims 8 to 14, wherein: 16. As the pressure applying means, a side pressure transmission cylinder (6) into which the workpiece is fitted, and a room (5a) containing the side pressure transmission cylinder are formed, and the interior and the exterior of the room communicate with each other. The cutting device according to any one of claims 8 to 15, further comprising a cutting container (5) having a hole (5b) formed therein. 17. The apparatus according to claim 16, wherein the detector is disposed in the cutting container and detects a cutting signal of the workpiece transmitted to the side pressure transmission cylinder. Cutting device.