JP2005199390A - Cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of much idle running time required for operation before actual cutting operation and deterioration in overall cutting efficiency due to need for a big tool path in consideration of variations if there are variations in the dimension of workpieces before cutting. <P>SOLUTION: This cutting device includes an electric potential setting machine 6 giving a set electric potential between the cutting tool side and the workpiece side in a state where the cutting tool 2 for cutting the workpiece 5 and the workpiece 5 are separated. It further includes a sensor 15 measuring capacitance based on the electric potential given between the cutting tool side and the workpiece side by the electric potential setting machine 6, and a control device 11 judging the distance between the cutting tool side and the workpiece side and controlling the feed rate of the cutting tool 2 according to the measurement of the capacitance measured by the sensor 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cutting device that can quickly bring a cutting tool in an NC machine tool or the like close to the workpiece, and more specifically, detects that the cutting tool has approached the workpiece and feeds it without contact. The present invention relates to a cutting apparatus capable of changing a speed.

  Conventionally, a cutting tool such as an NC machine tool moves faithfully in accordance with the order of NC programs created in advance to process a workpiece. This NC program is created on the basis of data such as a predetermined shape of the workpiece, a processing portion, a processing amount, and a processing procedure.

  As machining by this NC program, for example, after the workpiece is fixed at a predetermined position on the table, the cutting tool is moved at a high speed rapid feed speed at a position away from the workpiece, and when the workpiece approaches the workpiece, the cutting tool is moved. After changing to a low cutting feed rate, the workpiece is machined according to the NC program. By moving the cutting tool at a high speed rapid feed speed until it approaches the work piece, work efficiency is improved, and when the cutting tool approaches the work piece, the cutting speed is changed to a low speed to increase the load at the time of contact. This prevents the tool from being damaged. The machining by the NC program can be efficiently carried out when a plurality of the same shape is machined using the same program, and is not changed during the machining.

  On the other hand, if the workpiece is a large casting such as a vehicle carriage or a pump casing, the surface shape before processing may be affected by manufacturing errors or the like even if the workpiece is fixed at a predetermined position on the table as described above. May vary. In addition, such a large casting may have a large mounting error when it is fixed to the table. Therefore, when machining a large casting or the like, the relative distance between the cutting tool and the workpiece changes due to these manufacturing errors and mounting errors, and the machining start position differs.

  When machining such workpieces, it is possible to perform accurate machining individually if the operator adjusts the position of the tool to the machining start position, but the position of each workpiece is set. The adjustment work is very complicated and hinders automation. In addition, it is impractical to recreate the NC program in consideration of such variation in shape before processing and mounting errors.

  Therefore, in the NC program that processes workpieces with large dimensional variations such as large castings, the cutting tool can be processed at a rapid feed rate even if the processing start position of the workpiece changes slightly. Create an NC program with a large tool path (interval at which the cutting tool does not contact the workpiece) so that it does not come into contact with the workpiece, and move the cutting tool at a rapid feed rate when the cutting tool is far away from the workpiece. Then, the cutting tool is changed to the cutting feed speed long before it comes into contact with the workpiece, and after that, all operations are performed at the cutting feed speed.

In addition, as this type of prior art, a state detection device that detects a contact state and a non-contact state between the tool and the workpiece, based on the processing information given from the numerical control device. When the tool and workpiece are in non-contact state, the relative movement between the tool and workpiece is counted with a reversible counter device, and high-speed feeding is performed. When the counter device counts down to zero, There is something to be sent (for example, see Patent Document 1).
JP 56-119355 A (page 3-9, FIG. 2)

  However, as described above, when a tool path is set in the NC program so that the cutting tool does not come into contact with the workpiece in consideration of variations in dimensions of the workpiece before machining and mounting errors, A large tool path must be set in consideration of the safety factor, and a very large tool path is set as compared with the case of cutting a workpiece having an accurate dimension.

  For this reason, when such a large tool path is set, the cutting tool is fed at a slow cutting feed speed long before the cutting tool contacts the workpiece, and a lot of free running occurs before the actual machining operation is started. Time is required and overall processing efficiency is deteriorated.

  Note that setting a large tool path considering the safety factor is unavoidable when the speed of the cutting tool is automatically controlled using a program so that no operator is involved, such as an NC machine tool. This is the limit to control the speed of the cutting tool, and hinders the efficiency of the cutting process.

  Further, in the detection method of Patent Document 1, since the high speed feed is changed to the normal feed when the tool comes into contact with the work, a large load acts on the tool at the moment when the tool comes into contact with the work, and the tool is moved. There is a risk of damage.

  Therefore, in order to solve the above problems, the present invention provides a potential setting machine that provides a set potential between the cutting tool side and the workpiece side in a state where the cutting tool and the workpiece are separated from each other, A sensor for measuring the capacitance from the potential applied between the cutting tool side and the workpiece side by a setting machine is provided, and the feed rate of the cutting tool is controlled by the magnitude of the capacitance measured by the sensor. A control device is provided, and the control device is provided with a function of setting a rapid feed rate when the capacitance is larger than a set threshold value and setting a cutting feed rate when the capacitance is small. Thus, in the present invention, the speed of the cutting tool is controlled using the sensor.

  In addition, an electrode on the side of the cutting tool that is insulated from the cutting machine that drives the cutting tool is provided around the cutting tool, the workpiece is configured as the other electrode, and the potential between the electrodes is You may comprise so that a setting electric potential may be given with a setting machine.

  Further, the electrode on the cutting tool side is composed of a guard electrode provided on the inner peripheral side and a detection electrode provided on the outer peripheral side so as to prevent the cutting tool and the holder from affecting the measured capacitance value. May be.

  Further, an insulator is provided between the cutting tool and a cutting machine that drives the cutting tool, the cutting tool is configured as an electrode on the cutting tool side, the workpiece is configured as the other electrode, You may comprise so that a setting electric potential may be given between electrodes with the said electric potential setting machine.

  Further, the workpiece is insulated from the structure with an insulator to form an electrode on the workpiece side, an electrode is provided on the cutting tool side, and a set potential is applied between the electrodes by the potential setting machine. You may comprise as follows.

  According to the present invention, the cutting tool is stably fed at a rapid feed speed to a position close to the workpiece and cut even if the workpiece has a dimensional variation before the machining, an installation error, or the like by the means described above. The idle running time of the tool can be shortened and cutting can be performed efficiently.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a cutting apparatus according to the first embodiment of the present invention.

  As shown in the figure, the cutting apparatus 1 includes a cutting machine 3 provided with a cutting tool 2 such as an end mill, a workpiece 5 mounted on a table 4 for processing by the cutting machine 3, and these cuttings. A potential setting machine 6 that gives a predetermined potential between the machine 3 and the workpiece 5, a capacitance measuring instrument 7 that measures a capacitance from the potential given by the potential setting machine 6, and a capacitance measurement A data processing device 8 for processing data from the device 7 and a controller 9 for controlling the feed speed of the cutting tool 2 by the cutting machine 3 based on a signal from the data processing device 8 are provided. A cutting machine 3 provided with the cutting tool 2, a controller 9 for controlling the cutting machine 3, and a workpiece 5 attached to the table 4 are provided in a machining center 10 or the like. In this embodiment, a capacitance measuring device 7 is provided in the potential setting device 6, and the potential setting device 6 and the data processing device 8 are provided in the control device 11.

  In the first embodiment, the cutting tool side electrode 13 is provided around the holder 12 provided with the cutting tool 2, and the workpiece 5 itself is configured as the workpiece side electrode 14. In this example, the workpiece 5 side is grounded. These electrodes 13 and 14 and the control device 11 are connected by wirings 19 and 20, and a sensor 15 is constituted by these. The sensor 15 gives a set potential from the potential setting machine 6 between the electrode 13 and the electrode 14, measures the capacitance with the capacitance measuring device 7 from this potential, and uses the capacitance to determine the cutting tool 2. And the workpiece 5 are determined by the data processing device 8.

  In this embodiment, the electrode 13 is formed in a cylindrical shape, and has a double structure of a guard electrode 13A on the inner peripheral side and a detection electrode 13B on the outer peripheral side. By providing the guard electrode 13A on the inner peripheral side in this way, the measured value of the capacitance is prevented from being influenced by the cutting tool 2 and the holder 12 which are conductors. As this influence, the distance change range between the cutting tool 2 and the workpiece 5 and the capacitance change range are narrowed, and the range of the measurement value is narrowed. In addition, since the tendency for an electrostatic capacitance to change with respect to a change in the distance between the cutting tool 2 and the workpiece 5 is the same, it is not necessarily provided. In addition, when the clearance between the cutting tool 2 and the inner surface of the electrode 13 is wide, the capacitance measurement value is hardly affected even if the guard electrode 13A is not provided. can do. Furthermore, it is not necessary when the cutting tool 2 is configured as an electrode as will be described later.

  Further, the electrode 13 is provided with an insulator 16 at an upper position thereof, and an attachment portion 17 is provided at an upper portion thereof. The attachment portion 17 is for attaching the electrode 13 to the non-rotating body portion of the cutting machine 3 with a bolt 18. A wiring 19 from the potential setting device 14 is connected to the mounting portion 17. The electrode 13, the insulator 16, and the attachment portion 17 are integrally formed. When the electrode 13 is attached to the cutting machine 3, the electrode 13 is insulated from the cutting machine 3 by the insulator 16. Become.

  The electrode 3 on the side of the cutting tool configured as described above is provided in the cutting machine 3 in such a state that the cutting tool 2 is positioned substantially at the center position. As a result, the cutting tool 2 is surrounded by the electrode 13, and the cutting tool 2 is provided with a sensor 15 that can similarly detect the capacitance without directionality. Moreover, since one of the electrodes is the workpiece 5 itself, the sensor 15 can set the electrostatic capacitance between the cutting tool 2 and the entire circumference of the cutting tool 2 only by bringing the cutting tool 2 close to the workpiece 5. Since it can detect similarly, the distance with the workpiece 5 can be grasped | ascertained three-dimensionally. Note that the wiring 20 from the potential setting machine 14 is connected to the table 4 in contact with the workpiece 5.

  According to the cutting device 1 configured as described above, the distance between the cutting tool 2 and the workpiece 5 is determined as follows, and the cutting tool 2 is fast-forwarded at a position close to the workpiece 5 as follows. Thus, the cutting tool 2 can be stably switched to a cutting feed speed to realize a rapid feed of the cutting tool 2.

  That is, a predetermined set potential is applied from the potential setting machine 6 via the wirings 19 and 20 to the electrode 13 provided on the cutting tool 2 side and the table 4 to which the workpiece 5 is fixed, and the electrode is generated from the applied potential. The capacitance between the workpiece 13 and the workpiece 5 is measured by the capacitance measuring instrument 7. Then, the measured capacitance is sent to the data processing device 8, and compared with a threshold value set in advance by the data processing device 8. If the capacitance is smaller than the threshold value, the cutting tool 2 and the workpiece are processed. A signal is output to the controller 9 so that the cutting tool 2 is moved at a rapid feed speed by determining that the distance to the object 5 is long. On the other hand, if the measured capacitance is larger than the threshold value, it is determined that the distance between the cutting tool 2 and the workpiece 5 has approached the set distance, and the cutting tool 2 is sent to the controller 9 by slow cutting. A signal is output so as to move at a speed, and the feed speed of the cutting tool 2 is controlled by the cutting machine 3.

  The principle of determining the distance based on the magnitude of this capacitance is that Q = CV (Q: charge amount, C: capacitance, V: voltage) and C = εS / d (ε: dielectric constant, S: metal) From the area of the electrode, d: distance between the electrodes), Q = CV = εSV / d, and Q is inversely proportional to d. Therefore, since the capacitance C is Q / V, the distance d between the electrodes is The distance Q is based on the fact that the charge amount Q is small and the capacitance C is small, and the distance d is short and the charge amount Q is large and the capacitance C is large when the distance d is short.

  The results of measuring the voltage change (change in capacitance) when the cutting tool 2 is moved by the cutting apparatus 1 according to the first embodiment are shown in Examples 1 and 2 described later.

  In this way, by performing speed control using the sensor 15 to reduce the feed speed of the cutting tool 2 from the fast feed speed to the cutting feed speed, the speed of the cutting tool 2 can be controlled in a non-contact state. It can be stably controlled without affecting the surface. In addition, since the capacitance threshold value can be set according to the workpiece 5, the speed control is less affected by the surface shape of the workpiece 5. Moreover, if the workpiece 5 is a conductor, stable speed control can be performed regardless of the material.

As described above, according to this cutting apparatus 1, the fact that the cutting tool 2 is actually approaching the workpiece 5 during the operation of the NC machine tool or the like, Since it is grasped by measuring the capacitance with the sensor 15 from the potential applied during
Even if the workpiece 5 has a variation in dimensions before machining, an attachment error, etc., the cutting tool 2 is always fed at a rapid rapid feed speed to a position close to a predetermined distance from the workpiece 5, and the cutting feed speed is approached from the approached position. Therefore, the cutting tool 2 can be moved and processed efficiently.

  In addition, the sensor 15 as described above is provided to grasp the distance between the cutting tool 2 and the workpiece 5 in a non-contact manner and change the feed speed. Even if this occurs, the machining can be started without applying a large load at the beginning of the machining of the cutting tool 2.

  Further, since it is determined that the cutting tool 2 has approached the workpiece 5 using the sensor 15 in this way, the cutting tool 2 does not process the workpiece 5 due to a program input or an operator's operation error. Even when moving to or approaching the part, it is possible to grasp it three-dimensionally and to prevent damage to the cutting tool 2 and the workpiece 5 in advance.

  In addition, as shown in Examples 1 and 2 to be described later, it is possible to grasp that the workpiece 5 has been approached around the cutting tool 2 and to move the cutting tool 2 in the vertical direction. Since the cutting tool 2 can approach the workpiece 5 in a three-dimensional manner whether it is moved close to the workpiece 5 or moved laterally to approach the workpiece 5, the cutting can be performed. Even if the tool 2 is moved three-dimensionally, the feed speed can be reliably changed before contacting the workpiece 5, and the idle running time of the cutting tool 2 can be shortened without applying a large tool load at the time of contact. Can be stable.

  FIG. 2 is a flowchart showing an example of a simple processing procedure by the cutting apparatus of FIG. These procedures are advanced based on a preset program. An example of the processing procedure will be described based on this figure. This example is an example in which a single machining is completed by a program and machining at remote locations is continuously performed, and an example in which a tool may be sent to a remote location at a fast feed rate is shown.

  Immediately after the start (a), the capacitance check is turned ON (b), and the cutting tool 2 is sent in a predetermined direction. In this state, since the cutting tool 2 is separated from the workpiece 5, the cutting tool 2 is moved toward the workpiece 5 at the speed of fast feed (c). During this fast-forwarding, a capacitance check (d) is performed at predetermined intervals, and the measured capacitance is compared with a preset threshold value. When this capacitance is smaller than a preset threshold value, the flow returns immediately after the capacitance check ON (b), and the movement of the cutting tool 2 by rapid feed is continued.

  When it is detected that the capacitance measured in the capacitance check (d) is equal to or exceeds the threshold value, the cutting tool 2 is changed to the cutting feed (e) speed. At this time, the capacitance check is turned OFF (f), and thereafter, cutting based on the program is performed (g). The capacitance check function is turned off before cutting based on this program because the tool feed speed is changed even when the cutting tool 2 temporarily leaves the workpiece 5 during continuous machining. This is to prevent changes. The OFF of the capacitance check function is not necessary when the cutting tool 2 does not leave the workpiece 5, and may be determined according to the type of processing.

  When the cutting process based on this program is completed, it is determined whether or not the process is completed (h). And is it finished when you continue to cut away the machining points? The determination is NO, the process returns to before the capacitance check ON (b), and the cutting tool 2 is quickly moved to the next machining location by the speed of the rapid feed (c). Thereafter, the determination after the capacitance check (d) is repeated. And the processing end? If the determination (h) is YES, the process ends (i).

  This flowchart is an example, and is set according to the workpiece 5 and the type of processing.

  3 is a schematic view showing a cutting device according to a second embodiment of the present invention, FIG. 4 is a schematic view showing a cutting device according to the third embodiment, and FIG. 5 is according to the fourth embodiment. It is a schematic diagram which shows a cutting apparatus. In these embodiments, only the main configuration in the first embodiment is shown. Moreover, the same code | symbol is attached | subjected to the structure same as the cutting apparatus 1 of the said 1st Embodiment, and the detailed description is abbreviate | omitted.

  The second embodiment shown in FIG. 3 is an example in which the electrode 13 in the first embodiment is configured by only the detection electrode 21, and the workpiece-side electrode 14 is the workpiece 5 itself as in the first embodiment. It consists of As shown in the figure, this electrode 21 is also attached to the cutting machine 3 at the attachment portion 17 via the insulator 16. Even with such a configuration, the cutting tool 2 can be processed by applying a predetermined potential between the electrode 21 and the workpiece 5 and measuring the capacitance based on the potential with the capacitance measuring instrument 7. It is possible to stably grasp that the workpiece 5 has been approached, and to change the feed speed of the cutting tool 2 at a position that has always approached the workpiece 5.

  The third embodiment shown in FIG. 4 is an example in which the cutting tool 2 itself is configured as an electrode, and the electrode 14 on the workpiece side is configured by the workpiece 5 itself as in the first embodiment. As shown in the drawing, in this embodiment, the cutting tool 2 and its holder 12 are provided in the cutting machine 3 via an insulator 22, and in this example, the cutting tool 2 is one of the electrodes. Even with such a configuration, a predetermined potential is applied between the cutting tool 2 (electrode) and the workpiece 5, and the capacitance based on the potential is measured by the capacitance measuring device 7. It is possible to stably grasp that 2 has approached the workpiece 5 and to change the feed speed of the cutting tool 2 at a position always close to the workpiece 5.

  The fourth embodiment shown in FIG. 5 is an example in which the workpiece 5 is provided on the insulator 23 and configured as an electrode 14, and the cutting tool 2 side is configured as the other electrode (ground). As shown in the figure, the workpiece 5 is provided on the insulator 23 and configured as an electrode 14, and the cutting tool 2 is configured as the other electrode. Even with such a configuration, a predetermined potential is applied between the workpiece 5 and the cutting tool 2, and the capacitance based on the potential is measured by the capacitance measuring device 7. It is possible to stably grasp that the workpiece 5 has been approached, and to change the feed speed of the cutting tool 2 at a position that has always approached the workpiece 5.

  In addition, embodiment mentioned above has shown an example of embodiment, and the various change in the range which does not impair the summary of this invention is possible, and this invention is not limited to embodiment mentioned above.

  FIG. 6 is a graph of Example 1 in which the output voltage was measured when the cutting tool was moved in the vertical direction by the cutting apparatus shown in FIG. In this Example 1, when a predetermined voltage is applied between the cutting tool side and the workpiece, the cutting tool 2 is moved downward from an upper position 100 mm away from the workpiece 5 and brought closer to the workpiece. The relationship between the tool height (distance h shown in FIG. 1) between the tip of the cutting tool 2 and the surface of the workpiece 5 and the output voltage is obtained.

  As shown in the drawing, in Example 1, the cutting tool 2 is moved downward from a position where the tip of the cutting tool 2 is separated from the surface of the workpiece 5 by 100 mm upward, and gradually approaches the workpiece 5. The output voltage (capacitance) at each position at that time is measured. From this graph, it can be seen that the output voltage increases when the tip position of the cutting tool 2 approaches the surface of the workpiece 5.

  Therefore, based on this data, if the voltage at the distance to be set is determined as a threshold value to determine how close the cutting tool 2 is to the workpiece 5 as the speed change point, the electrostatic potential of the set voltage is set. Until the capacity is detected, the cutting tool 2 can be moved quickly at a fast feed speed. When the capacitance of the set voltage is detected, the cutting tool 2 can be switched to the cutting feed speed and moved efficiently.

  In addition, by using the voltage that changes depending on the tool height as the control value for changing the feed rate in this way, the workpiece 5 can be stably obtained even if the surface shape of the workpiece 5 varies slightly. Thus, the cutting tool 2 can be quickly sent to a position separated by a predetermined distance to perform cutting efficiently and stably.

  Since the relationship between the tool height and the output voltage varies depending on the set voltage, the diameter of the cutting tool 2, the size of the electrode 13, and the like, it may be set according to individual conditions.

  FIG. 7 is a graph of Example 2 in which the output voltage was measured when the cutting tool was moved in the lateral direction with the cutting apparatus shown in FIG. In Example 2, a predetermined voltage is applied between the cutting tool side and the workpiece, and the cutting tool 2 is moved laterally (X-axis direction) from a lateral position 250 mm away from the workpiece 5. The relationship between the distance in the X-axis direction and the output voltage when they are brought closer to each other is obtained by varying the tool height (distance h shown in FIG. 1) between the tip of the cutting tool 2 and the surface of the workpiece 5.

  As shown in the drawing, in Example 2, the tool height between the tip of the cutting tool 2 and the surface of the workpiece 5 is set to −10 mm from the surface of the workpiece 5 (the tip of the cutting tool 2 is set to the workpiece 5). 3 states of a state in which the cutting tool 2 is positioned 10 mm below the surface), a state 10 mm away from the surface, and a state 30 mm away from the surface. Then, the cutting tool 2 is moved laterally from a position 250 mm away from the workpiece 5 to gradually approach the workpiece 5, and the output voltage (capacitance) at each tool height at that time is measured. From this graph, it can be seen that, even if the tip position of the cutting tool 2 is shifted in the vertical direction with respect to the surface of the workpiece 5, the output voltage rises if it moves in the horizontal direction and approaches.

  Therefore, based on this data, if the voltage at the distance to be set is determined as a threshold value to determine how close the cutting tool 2 is to the workpiece 5 as the speed change point, the electrostatic potential of the set voltage is set. Until the capacity is detected, the cutting tool 2 can be moved quickly at a fast feed speed. When the capacitance of the set voltage is detected, the cutting tool 2 can be switched to the cutting feed speed and moved efficiently.

  In addition, by using the voltage that changes according to the lateral distance of the tool as a control value for changing the speed in this way, even if the surface shape of the workpiece 5 changes slightly, the workpiece can be stably processed. The cutting tool 2 can be quickly sent to a position away from the object 5 by a predetermined distance, and cutting can be performed efficiently.

  Furthermore, by combining with the measurement in the vertical direction in the first embodiment, it is possible to grasp that the cutting tool 2 has approached the workpiece 5 in a three-dimensional manner, and even in a three-dimensional machining, it is quick. The cutting tool 2 can be sent to a position close to the workpiece 5 to perform efficient cutting.

  Since the relationship between the tool height and the output voltage varies depending on the set voltage, the diameter of the cutting tool 2, the size of the electrode 13, and the like, it may be set according to individual conditions.

  The cutting apparatus according to the present invention is useful for a cutting apparatus that automatically processes a workpiece that causes variations in dimensions before processing of the workpiece or causes attachment errors.

It is a block diagram which shows the structure of the cutting apparatus which concerns on 1st Embodiment of this invention. It is a flowchart which shows an example of the process sequence by the cutting apparatus of FIG. It is a schematic diagram which shows the cutting apparatus which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the cutting apparatus which concerns on 3rd Embodiment of this invention. It is a schematic diagram which shows the cutting apparatus which concerns on 4th Embodiment of this invention. It is the graph of Example 1 which measured the output voltage when the cutting tool was moved to the up-down direction with the cutting apparatus shown in FIG. It is the graph of Example 2 which measured the output voltage when the cutting tool was moved to the horizontal direction with the cutting apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cutting device 2 ... Cutting tool 3 ... Cutting machine 4 ... Table 5 ... Workpiece 6 ... Electric potential setting machine 7 ... Capacitance measuring device 8 ... Data processing device 9 ... Controller 10 ... Machining center 11 ... Control device 12 ... Holder 13 ... Electrode 14 ... Electrode 15 ... Sensor 16 ... Insulator 17 ... Mounting part 18 ... Bolt 19 ... Wiring 20 ... Wiring 21 ... Electrode 22 ... Insulator 23 ... Insulator

Claims (5)

  A potential setting machine that provides a set potential between the cutting tool side and the workpiece side in a state where the cutting tool and the workpiece are separated is provided between the cutting tool side and the workpiece side. Is provided with a sensor for measuring the capacitance from the potential applied thereto, and a control device for controlling the feed rate of the cutting tool according to the magnitude of the capacitance measured by the sensor is provided. Is a cutting device provided with a function of setting a rapid feed speed when it is larger than a set threshold value, and a cutting feed speed when it is smaller.   An electrode on the side of the cutting tool that is insulated from the cutting machine that drives the cutting tool is provided around the cutting tool, the workpiece is configured as the other electrode, and the potential setting machine is provided between these electrodes. The cutting apparatus according to claim 1, wherein the cutting apparatus is configured to apply a set potential.   The cutting apparatus according to claim 2, wherein the electrode on the cutting tool side is composed of a guard electrode provided on the inner peripheral side and a detection electrode provided on the outer peripheral side.   An insulator is provided between the cutting tool and a cutting machine that drives the cutting tool, the cutting tool is configured as an electrode on the cutting tool side, the workpiece is configured as the other electrode, and the gap between these electrodes The cutting apparatus according to claim 1, wherein a set potential is applied to the at least one potential setting machine. The workpiece is insulated from the structure by an insulator to form an electrode on the workpiece side, an electrode is provided on the cutting tool side, and a set potential is applied between the electrodes by the potential setting machine. The cutting apparatus according to claim 1 configured.

Images