Control device, machine tool, and control method

Abstract

A control device (14) for a machine tool (10) is provided with: an acquisition unit (76) for acquiring the type of a tool (16) for machining an object to be machined; a determination unit (78) that determines whether the operation of the mist collector (34) is permitted or prohibited on the basis of the type of the tool (16); and a collector control unit (80) that, when a determination is made that the operation of the mist collector (34) is permitted, turns on the operation of the mist collector (34), and when a determination is made that the operation of the mist collector (34) is prohibited, turns off the operation of the mist collector (34).

Description

Technical Field

[0001] The present invention relates to a control device for controlling a machine tool having a mist collector, a machine tool related to the control device, and a control method. Background Art

[0002] The mist collector collects the mist generated in the processing area of ​​the machine tool (see Japanese Patent Laid-Open No. 2012-076006). The mist collector collects the mist in the processing area to prevent the mist from leaking out of the processing area. In addition, the mist contains vaporized coolant. Summary of the invention

[0003] The mist collector may vibrate when the mist collector is in operation. In this case, there is a concern that the vibration generated by the mist collector may affect the processing of the object to be processed and reduce the processing accuracy.

[0004] The object of the present invention is to solve the above-mentioned problems.

[0005] The first embodiment of the present invention is a control device for a machine tool, wherein the machine tool is provided with a mist collector for recovering mist in a processing area, and a processing object is processed in the processing area, and the control device comprises: an acquisition unit, which acquires the type of a tool used for processing the processing object; a determination unit, which determines whether to allow or prohibit the operation of the mist collector based on the type of the tool; and a collector control unit, which turns on the operation of the mist collector when a determination is made that the operation of the mist collector is allowed, and turns off the operation of the mist collector when a determination is made that the operation of the mist collector is prohibited.

[0006] A second aspect of the present invention is a machine tool including the control device of the first aspect.

[0007] The third embodiment of the present invention is a control method, which controls a machine tool by a computer, wherein the machine tool has a fog collector for recovering fog in a processing area, and processes a processing object in the processing area, and the control method includes: an acquisition step, acquiring the type of tool used for processing the processing object; a judgment step, judging whether to allow or prohibit the operation of the fog collector according to the type of the tool; and a collector control step, turning on the operation of the fog collector when a judgment is made to allow the operation of the fog collector, and turning off the operation of the fog collector when a judgment is made to prohibit the operation of the fog collector.

[0008] According to the present invention, for example, when a processing object is processed by a tool used in precision processing, the recovery of mist by the mist collector can be stopped. Therefore, the influence of the vibration generated by the mist collector on the processing of the processing object can be suppressed. As a result, the reduction of processing accuracy can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of a machine tool according to an embodiment. Figure 2 is a block diagram of the control device. Figure 3 is a flowchart illustrating a control method according to an embodiment. Figure 4 It is a schematic diagram of a machine tool according to Modification 1. Figure 5 This is a block diagram of a control device according to Modification 2. DETAILED DESCRIPTION

[0010] [Implementation Method] Figure 1 It is a schematic diagram of the machine tool 10 according to the embodiment.

[0011] in addition, Figure 1 The X direction and Y direction shown are parallel to the horizontal plane. In addition, the X direction and the Y direction are orthogonal to each other. Moreover, Figure 1 The Z direction shown is parallel to the direction of gravity. Therefore, the Z direction is orthogonal to the X direction and the Y direction. However, Figure 1 The Z direction shown indicates the direction opposite to the direction of gravity.

[0012] The machine tool 10 includes a processing machine 12 and a control device 14 .

[0013] The processing machine 12 is a machine device that processes a processing object using a tool 16. The processing machine 12 includes a spindle 18, a spindle head 20, a column 22, a base 24, a table 26, a table drive unit 28, a cover 30, a coolant supply device 32, and a mist collector 34.

[0014] A tool holder 36 is mounted on the spindle 18. The tool holder 36 is attachable and detachable relative to the spindle 18. The tool holder 36 holds the tool 16. The tool 16 is, for example, a spring turning tool, a drill, an end mill, a milling cutter, or the like.

[0015] The processing machine 12 further includes a tool magazine 38. The tool magazine 38 detachably holds a plurality of tools 16. One tool 16 of the plurality of tools 16 held in the tool magazine 38 is replaceably mounted on the tool holder 36.

[0016] The spindle head 20 supports the spindle 18. The spindle head 20 also includes a motor for rotating the spindle 18. The tool 16 mounted on the spindle 18 via the tool holder 36 rotates together with the spindle 18.

[0017] The column 22 supports the spindle head 20 . The column 22 includes a motor for moving the spindle head 20 in the Z direction. The column 22 is supported by a base 24 .

[0018] The pedestal 24 is installed on a setting surface. The setting surface is, for example, a floor of a factory. The setting surface may also be a supporting surface of a table installed on the floor. The setting surface extends, for example, parallel to a horizontal plane. The pedestal 24 may also have a plurality of legs 24a. Each leg 24a is, for example, a caster, a jack, or the like.

[0019] The table driving unit 28 is supported by the base 24. The table driving unit 28 includes a first sliding unit 42, a saddle 44, and a second sliding unit 46.

[0020] The first slide portion 42 is provided on the pedestal 24 . The first slide portion 42 includes, for example, a guide rail extending in the Y direction. The first slide portion 42 supports the saddle 44 .

[0021] The saddle 44 moves in the Y direction by driving of a motor (not shown). The motor is controlled by the control device 14. The saddle 44 moves while being guided by the first slide portion 42.

[0022] The second slide portion 46 is provided on the saddle 44. The second slide portion 46 includes, for example, a guide rail extending in the X direction.

[0023] The table 26 supports a processing object (not shown) below the spindle 18. The table 26 is supported by the second slide 46. The table 26 moves in the X direction by the drive of a motor (not shown). The motor is controlled by the control device 14. The table 26 moves while being guided by the second slide 46.

[0024] The cover 30 covers the spindle 18, the spindle head 20, the column 22, the pedestal 24, the table 26, and the table driving unit 28. Thus, the cover 30 forms a processing area 48. The processing object is processed in the processing area 48.

[0025] The cover 30 further includes a door and a window, which are not shown. The operator can carry out operations such as carrying the processing object into the processing area 48 through the door in an open state. In addition, the operator can easily check the state in the processing area 48 through the window.

[0026] The coolant supplier 32 is a device that supplies coolant to the processing area 48. The coolant supplier 32 includes a coolant tank 50, a nozzle 52, a supply pipe 54, and a pump 56.

[0027] The coolant tank 50 is a tank for storing coolant and is provided outside the processing area 48 .

[0028] The nozzle 52 is a spraying portion that sprays the coolant. The nozzle 52 is disposed in the processing area 48. In addition, the coolant supplier 32 may include a plurality of nozzles 52.

[0029] The supply pipe 54 is a pipe connecting the coolant tank 50 and the nozzle 52. The coolant supplier 32 may include a plurality of supply pipes 54. The number of supply pipes 54 is determined, for example, by the number of nozzles 52. The supply pipe 54 penetrates the cover 30 and connects the coolant tank 50 and the nozzle 52.

[0030] The pump 56 is connected to the supply pipe 54. The pump 56 draws the coolant in the coolant tank 50 and delivers it to the nozzle 52. Thus, the coolant is sprayed from the nozzle 52 into the processing area 48. In addition, the pump 56 is controlled by the control device 14.

[0031] The coolant sprayed into the processing area 48 cools the tool 16 and the object to be processed. The coolant sprayed into the processing area 48 vaporizes, and the vaporized mist is generated in the processing area 48.

[0032] The mist collector 34 is a device for collecting mist in the processing area 48. The mist collector 34 is provided outside the processing area 48. In addition, the mist collector 34 is connected to the cover 30 via a duct 58. The mist collector 34 collects the mist by sucking the air in the processing area 48. Thus, it is possible to prevent the mist from leaking out of the processing area 48 through a small gap generated in the processing machine 12.

[0033] When the object to be processed is cut by the tool 16, fine chips are generated as dust in the processing area 48. When the mist collector 34 sucks the air in the processing area 48, not only the mist but also the dust is collected by the mist collector 34. Thus, it is also possible to prevent the dust from leaking out of the processing area 48 through a small gap generated in the processing machine 12.

[0034] The mist collector 34 may be connected to the coolant tank 50. Thus, the mist collected by the mist collector 34 can be returned to the coolant tank 50 as a cooling medium.

[0035] When the mist collector 34 and the coolant tank 50 are connected, the mist collector 34 and the coolant tank 50 are preferably connected via a filter device (filter) not shown. The filter device removes impurities in the coolant sent from the mist collector 34 to the coolant tank 50. If the mist collector 34 and the coolant tank 50 are connected via the filter device, clean coolant can be returned from the mist collector 34 to the coolant tank 50. Impurities in the coolant are, for example, chips recovered together with the mist.

[0036] Figure 2 is a block diagram of the control device 14 .

[0037] The control device 14 is a computer that controls the processing machine 12. The control device 14 is, for example, a numerical control device. The control device 14 includes a display unit 60, an operation unit 62, a storage unit 64, a calculation unit 66, and a backup power supply unit 68.

[0038] The display unit 60 is a display device including a display screen 60d. The display unit 60 is, for example, a liquid crystal display device or an OEL (Organic Electro-Luminescence) display device.

[0039] The operation unit 62 is an input device for receiving instructions from the operator to the control device 14. The operation unit 62 includes, for example, an operation panel 62a, a touch panel 62b, etc. The touch panel 62b is provided on the display screen 60d. The operation unit 62 (operation panel 62a) may also include a keyboard, a mouse, etc.

[0040] The storage unit 64 may be composed of a volatile memory (not shown) and a nonvolatile memory (not shown). Examples of volatile memory include RAM (Random Access Memory). Examples of nonvolatile memory include ROM (Read Only Memory), flash memory, etc. Data, etc. may be stored in a volatile memory, for example. Programs, tables, mappings, etc. may be stored in a nonvolatile memory, for example. At least a portion of the storage unit 64 may also be provided in a processor, an integrated circuit, etc. In the present embodiment, the storage unit 64 stores a control program 70 and a processing program 72.

[0041] The control program 70 is a program for causing the control device 14 to execute the control method of the present embodiment. The control method will be described later.

[0042] The processing program 72 is a program including control commands for the processing machine 12. The processing program 72 includes, for example, a plurality of control commands for controlling the above-mentioned motors. In addition, the processing program 72 includes, for example, a plurality of control commands for controlling the coolant supplier 32. The processing program 72 is created or edited in advance by an operator.

[0043] The calculation unit 66 may be composed of a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The calculation unit 66 includes a processing circuit.

[0044] The operation unit 66 includes a processing control unit 74, an acquisition unit 76, a determination unit 78, and a collector control unit 80. The processing control unit 74, the acquisition unit 76, the determination unit 78, and the collector control unit 80 are implemented by the processor of the operation unit 66 executing the control program 70. At least a part of the processing control unit 74, the acquisition unit 76, the determination unit 78, and the collector control unit 80 can also be implemented by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). In addition, at least a part of the processing control unit 74, the acquisition unit 76, the determination unit 78, and the collector control unit 80 can also be constituted by an electronic circuit including discrete devices.

[0045] The processing control unit 74 controls the processing machine 12 according to the processing program 72, thereby processing the processing object. The processing control unit 74 controls the installation of the tool 16, the rotation of the spindle 18, the movement of the spindle head 20, and the movement of the table 26. However, in the processing machine 12, the collector control unit 80 controls the mist collector 34.

[0046] The acquisition unit 76 acquires the type of the tool 16 used for processing the processing object. When the installation of the tool 16 is detected, the acquisition unit 76 starts to acquire the type of the tool 16. The installation of the tool 16 is performed before the processing of the processing object starts. The installation of the tool 16 also includes the case where the tool 16 is replaced with a new tool. The installation of the tool 16 is detected by a switch, a sensor, etc. provided on the spindle head 20. In this case, the acquisition unit 76 recognizes that the installation of the tool 16 is detected based on the detection signal output from the switch, the sensor, etc., and starts to acquire the type of the tool 16.

[0047] The acquisition unit 76 can acquire the type of the tool 16 based on the tool identification information. In this case, the tool table stored in the storage unit 64 is used. In the tool table, the tool identification information is associated with the type information indicating the type of the tool 16. The tool identification information is information for identifying the tool 16, including at least one of a tool number, a tool weight, a tool diameter, a tool length, and a tool runout. The tool runout is the runout (the runout amplitude from the rotating axis) of the tool 16 rotating at a predetermined rotation speed.

[0048] For example, the acquisition unit 76 can use the tool table to acquire the type of the tool 16 corresponding to the tool number included in the processing program 72. In addition, for example, the acquisition unit 76 can use the tool table to acquire the type of the tool 16 corresponding to at least one of the tool weight, tool diameter, tool length, and tool runout detected by the detection mechanism. The detection mechanism includes a camera, a measuring instrument, a sensor, etc. installed on the processing machine 12. As the sensor, a weight sensor, a vibration sensor, etc. can be listed.

[0049] The acquisition unit 76 may acquire the type of the tool 16 input from the operation unit 62 according to the operation of the operator. In this case, the acquisition unit 76 may control the display unit 60 and the like to notify the operator that the type of the tool 16 should be input.

[0050] The determination unit 78 determines whether to allow or prohibit the operation of the mist collector 34 based on the type of the tool 16 acquired by the acquisition unit 76. In this case, the determination table TB stored in the storage unit 64 is used. In the determination table TB, the type information indicating the type of the tool 16 and the state information indicating whether the operation of the mist collector 34 is allowed or prohibited are matched. For example, in the case where the type information indicates a milling cutter or a drill, the determination unit 78 determines that the operation of the mist collector 34 is allowed. In addition, for example, in the case where the type information indicates a spring turning tool or an end mill, the determination unit 78 determines that the operation of the mist collector 34 is prohibited.

[0051] When the type information indicates the type of tool 16 used in precision machining, the determination unit 78 may determine that the operation of the mist collector 34 is prohibited. In addition, when the type information indicates the type of tool 16 having a natural frequency that is consistent with or similar to the vibration of the mist collector 34, the determination unit 78 may determine that the operation of the mist collector 34 is prohibited.

[0052] The collector control unit 80 controls the mist collector 34 according to the determination result of the determination unit 78. When the determination unit 78 determines that the operation of the mist collector 34 is permitted, the collector control unit 80 turns on the operation of the mist collector 34. In this case, the mist collector 34 is automatically started from the moment the operation of the mist collector 34 is turned on, and the recovery of the mist is started.

[0053] On the other hand, when the determination unit 78 determines to prohibit the operation of the mist collector 34, the collector control unit 80 turns off the operation of the mist collector 34. In this case, the mist collector 34 is not activated.

[0054] The backup power supply unit 68 is a power supply different from the main power supply of the control device 14. The backup power supply unit 68 includes, for example, a battery. The backup power supply unit 68 is built into the control device 14. However, the backup power supply unit 68 may be provided on the machine tool 10 as an external power supply of the control device 14. In addition, the main power supply of the control device 14 is omitted from the illustration.

[0055] When the main power supply of the control device 14 is turned off during the operation of the mist collector 34, the backup power supply unit 68 supplies power to each unit of the control device 14. Thus, the collector control unit 80 can continue to control the mist collector 34 even after the main power supply is turned off.

[0056] In the case where the mist collector 34 is powered by a power source different from the main power source of the control device 14, the mist collector 34 can continue to operate even if the main power source of the control device 14 is disconnected. In this case, the main power source of the control device 14 can be disconnected before the collector control unit 80 stops the mist collector 34. In this case, by supplying power from the backup power supply unit 68, the collector control unit 80 can automatically stop the mist collector 34 even after the main power source of the control device 14 is disconnected. Thus, the mist collector 34 is prevented from wasting power.

[0057] Figure 3 is a flowchart illustrating a control method according to an embodiment.

[0058] The control device 14 may, for example, execute Figure 3 The control method shown. Figure 3 The control method includes an acquisition step S1, a determination step S2, a collector control step S3 and a processing step S4. The collector control step S3 includes an operation start step S31 and an operation stop step S32. The acquisition step S1, the determination step S2 and the collector control step S3 are performed before the processing of the processing object starts.

[0059] The acquisition step S1 is a step of acquiring the type of the tool 16. In the acquisition step S1 of the present embodiment, the type of the tool 16 is acquired by the acquisition unit 76. When the attachment of the tool 16 to the spindle 18 is detected, the acquisition unit 76 analyzes the machining program 72 that executes the attachment of the tool 16 and acquires the type of the tool 16.

[0060] Determination step S2 is a step of determining whether to allow or prohibit the operation of the mist collector 34 based on the type of the tool 16 acquired in acquisition step S1. In determination step S2 of the present embodiment, the determination unit 78 determines whether to allow or prohibit the operation of the mist collector 34 based on the determination table TB.

[0061] When the state information of the determination table TB corresponding to the type of the tool 16 obtained in the acquisition step S1 indicates that the operation of the mist collector 34 is allowed (S2: "No"), the determination unit 78 determines that the operation of the mist collector 34 is allowed. On the contrary, when the state information of the determination table TB corresponding to the type of the tool 16 obtained in the acquisition step S1 indicates that the operation of the mist collector 34 is prohibited (S2: "Yes"), the determination unit 78 determines that the operation of the mist collector 34 is prohibited. According to the determination content in the determination step S2, the operation start step S31 or the operation stop step S32 is started.

[0062] The operation start step S31 is a step of starting the operation of the mist collector 34. In the operation start step S31 of the present embodiment, the operation of the mist collector 34 is started by the collector control unit 80. In this case, the processing of the processing object starts after the mist collector 34 starts collecting the mist.

[0063] The operation shut-off step S32 is a step of shutting down the operation of the mist collector 34. In the operation shut-off step S32 of the present embodiment, the operation of the mist collector 34 is shut down by the collector control unit 80. In this case, the mist collector 34 does not collect mist, and processing of the object to be processed is started.

[0064] The processing step S4 is a step of processing the processing object. In the processing step S4 of the present embodiment, the processing object is processed by the processing control unit 74 controlling the processing machine 12. In this case, the processing control unit 74 processes the processing object based on the processing program 72 for mounting the tool 16 on the spindle 18.

[0065] In the case where the operation of the mist collector 34 is turned off in the collector control step S3, when the processing of the processing object is completed, Figure 3 The control method ends. In the case where the operation of the mist collector 34 is turned on in the collector control step S3, the collector control unit 80 stops the mist collector 34 at the moment when the processing of the processing object is completed. In this case, when the mist collector 34 stops, Figure 3 The control method ends.

[0066] As described above, in the present embodiment, the type of the tool 16 used in the processing of the processing object is obtained, and whether to allow or prohibit the operation of the mist collector 34 is determined based on the type of the tool 16. When the determination is made to allow the operation of the mist collector 34, the operation of the mist collector 34 is turned on, and when the determination is made to prohibit the operation of the mist collector 34, the operation of the mist collector 34 is turned off.

[0067] Thus, when the object to be processed is processed by the tool 16 used in precision processing, etc., the recovery of the mist of the mist collector 34 can be stopped. Therefore, the vibration generated by the mist collector 34 can be suppressed from affecting the processing of the object to be processed. As a result, the reduction in processing accuracy can be suppressed. In addition, by stopping the mist collector 34, the power consumption of the mist collector 34 is suppressed. Furthermore, the operation of the mist collector 34 can be turned on and off regardless of the spraying state of the coolant.

[0068] [Modifications] The following describes a modified example of the above embodiment. However, in the following description, the description that overlaps with the above embodiment is appropriately omitted. Unless otherwise specified, the elements described in the above embodiment are given the same reference numerals as in the above embodiment.

[0069] (Variant 1) Figure 4 1 is a schematic diagram of a machine tool 101 (10) according to Modification 1. The machine tool 101 further includes a sub-controller 82. In the machine tool 101, the backup power supply unit 68 of the controller 14 may be omitted.

[0070] The sub-control device 82 is a computer different from the control device 14. The sub-control device 82 includes, for example, a processor and a memory. The sub-control device 82 may include an integrated circuit, a discrete device, or the like.

[0071] When the control device 14 stops, the sub-control device 82 controls the mist collector 34 instead of the collector control unit 80. Therefore, even when the control device 14 stops, the mist collector 34 is controlled by the sub-control device 82 in the same manner as in the embodiment.

[0072] For example, when the processing is finished, the operator instructs the control device 14 to stop immediately. As a result, the control device 14 stops immediately after the processing is finished. However, as described above, it is preferred that the mist collector 34 recovers the mist from the end of the processing until a predetermined time has passed. In this case, the sub-control device 82 can control the mist collector 34 instead of the control device 14.

[0073] In addition, for example, when the main power supply of the control device 14 is turned off before the collector control unit 80 stops the mist collector 34 , the sub-control device 82 may control the mist collector 34 instead of the control device 14 .

[0074] In addition, it is preferred that the sub-control device 82 and the control device 14 communicate appropriately and share data required for controlling the mist collector 34. For example, the sub-control device 82 and the control device 14 share the type of the tool 16 acquired by the acquisition unit 76, the determination content of the determination unit 78, and the progress of the processing. As a result, the sub-control device 82 can smoothly take over the control performed by the collector control unit 80. According to this modified example, even after the control device 14 stops, the control of the mist collector 34 can be continued by the sub-control device 82.

[0075] (Variant 2) Figure 5 This is a block diagram of a control device 142 ( 14 ) according to Modification 2. The control device 142 further includes an alarm output unit 84 .

[0076] The alarm output unit 84 outputs an alarm when an abnormality occurs in the machine tool 10. For example, the machine tool 10 is appropriately equipped with sensors (not shown) for detecting failures in various parts such as the spindle 18, the spindle head 20, and the table drive unit 28. The alarm output unit 84 determines whether a failure has occurred in the machine tool 10 based on the signals output by the sensors. When a failure in various parts of the machine tool 10 is detected, the alarm output unit 84 notifies the operator of the failure, for example, via the display unit 60.

[0077] When the alarm output unit 84 outputs an alarm before the start of processing, the processing control unit 74 does not start processing until the cause of the alarm is eliminated. In addition, when the alarm output unit 84 outputs an alarm after the start of processing, the processing control unit 74 interrupts the processing based on the processing program 72 until the cause of the alarm is eliminated.

[0078] On the other hand, when an alarm is output, if the operation of the mist collector 34 is on, the collector control unit 80 stops the operation of the mist collector 34 until the cause of the alarm is eliminated. This can prevent the mist collector 34 from continuing to operate in an emergency of the machine tool 10. However, the collector control unit 80 may restart the operation of the mist collector 34 when there is an instruction to start the operation from the operator when the processing machine 12 stops abnormally.

[0079] (Combination of multiple variations) The above-mentioned multiple modified examples may be appropriately combined within a range not inconsistent with each other.

[0080] [Modified embodiment] The present invention is not limited to the above-described embodiment, and various configurations may be employed without departing from the gist of the present invention.

[0081] For example, according to the above-mentioned embodiment, the processing control unit 74 ends the processing, and the mist collector 34 stops. However, the collector control unit 80 may control the mist collector 34 during the period from the end of the processing to the elapse of the prescribed time, so that the mist collector 34 recovers the mist in the processing area 48. By still operating the mist collector 34 after the processing is completed, it is possible to prevent the leakage of the recovered mist. The prescribed time is indicated in advance to the collector control unit 80 by the operator via the operating unit 62, for example. However, the prescribed time may also be specified by the manufacturer of the machine tool 10.

[0082] In addition, for example, according to the above-mentioned embodiment, before the processing of the processing object is started, the collector control unit 80 causes the mist collector 34 to start collecting mist. However, the collector control unit 80 may cause the mist collector 34 to start collecting mist after a predetermined standby time has passed since the processing of the processing object is started. By still operating the mist collector 34 after the processing starts, the power consumption of the mist collector 34 can be suppressed. The standby time is indicated in advance to the collector control unit 80 by the operator via the operation unit 62, for example. However, the standby time may also be specified by the manufacturer of the machine tool 10.

[0083] In addition, for example, the collector control unit 80 may receive an instruction from an operator to allow the operation of the mist collector 34 during the period from when the determination of prohibiting the operation of the mist collector 34 is made to when the processing of the processing object is completed. If there is an instruction to allow the operation of the mist collector 34, the collector control unit 80 will turn on the operation of the mist collector 34 even if a determination to prohibit the operation is made. Similarly, the collector control unit 80 may receive an instruction from an operator to prohibit the operation of the mist collector 34 during the period from when the determination of permitting the operation of the mist collector 34 is made to when the processing of the processing object is completed. If there is an instruction to prohibit the operation of the mist collector 34, the collector control unit 80 will turn off the operation of the mist collector 34 even if a determination to permit the operation is made. In this way, when receiving an instruction from an operator to permit or prohibit the operation of the mist collector 34, the collector control unit 80 gives priority to the instruction and turns on or off the operation of the mist collector 34 regardless of the determination of the determination unit 78. Thus, the operation of the mist collector 34 can be turned on and off with priority given to the operator's intention.

[0084] In addition, for example, the determination unit 78 may also determine whether to allow or prohibit the operation of the mist collector 34 based on the type of tool 16 and the material of the processing object. The material of the processing object may be added to the determination table TB or may be input by the operator. By adding the material of the processing object to the determination condition of the determination unit 78, the circumstances in which the operation of the mist collector 34 is allowed and the circumstances in which the operation of the mist collector 34 is prohibited can be specified in detail. The vibration (processing vibration) generated when the processing object is processed may resonate with the vibration (collector vibration) generated from the mist collector 34. The processing vibration depends not only on the tool 16, but also on the material of the processing object. Therefore, by adding the material of the processing object to the determination condition of the determination unit 78, when there is a possibility that the collector vibration and the processing vibration resonate, it is possible to appropriately determine whether to prohibit the operation of the mist collector 34.

[0085] In addition, for example, the processing control unit 74 may control the coolant pump 56 according to the operating state of the mist collector 34. That is, when the determination unit 78 determines that the operation of the mist collector 34 is permitted, the processing control unit 74 drives the coolant pump 56. On the other hand, when the determination unit 78 determines that the operation of the mist collector 34 is prohibited, the processing control unit 74 does not drive the coolant pump 56. In this way, it is possible to suppress the vibration generated by the coolant supplier 32 from affecting the processing of the processing object.

[0086] In addition, for example, the state information may be defined as an option in the processing program 72. In this case, the determination unit 78 may determine whether to allow or prohibit the operation of the mist collector 34 based on the processing program 72. Therefore, the determination table TB may not be stored in the storage unit 64. Therefore, the storage capacity of the storage unit 64 can be reduced.

[0087] In addition, for example, the spraying method of the coolant is not limited to the embodiment. For example, the coolant may be sprayed using a center supply method. In this case, the coolant supplier 32 supplies the coolant to the spindle 18. The coolant may also flow along the inner wall of the cover 30 (processing area 48).

[0088] In addition, for example, the processing machine 12 may also be provided with a recovery member (not shown) for recovering the coolant that falls under the workbench 26. The recovery member is, for example, an oil pan disposed on the base 24. A portion of the cooling medium supplied to the processing area 48 does not become mist, but falls under the workbench 26. According to this variation, the coolant that falls under the workbench 26 can be recovered. The recovered coolant can be returned to the coolant tank 50. Thus, the coolant supplier 32 can reuse the recovered coolant. Here, it is preferred to configure a filtering device (filter) between the recovery member and the coolant tank 50. Thus, clean coolant can be returned to the coolant tank 50.

[0089] [Inventions from Embodiments] Hereinafter, the invention which can be grasped from the above-mentioned embodiment and modification examples will be described.

[0090] (1) The first invention is a control device (14) for a machine tool (10), wherein the machine tool has a mist collector (34) for recovering mist within a processing area (48), and a processing object is processed within the processing area, and the control device (14) has: an acquisition unit (76) for acquiring the type of a tool (16) used for processing the processing object; a determination unit (78) for determining whether to allow or prohibit the operation of the mist collector based on the type of the tool; and a collector control unit (80) for starting the operation of the mist collector when a determination is made that the operation of the mist collector is allowed, and for turning off the operation of the mist collector when a determination is made that the operation of the mist collector is prohibited.

[0091] Thus, for example, when a processing object is processed by a tool used in precision processing, the recovery of mist by the mist collector can be stopped. Therefore, the vibration generated by the mist collector can be suppressed from affecting the processing of the processing object. As a result, the reduction in processing accuracy can be suppressed.

[0092] (2) The first invention is a control device, and the collector control unit may use a determination table (TB), and the determination table (TB) associates type information indicating the type of the tool with status information indicating whether the operation of the mist collector is permitted or prohibited. Thus, the tool used to turn on and off the operation of the mist collector can be managed.

[0093] (3) The first invention is a control device, wherein the collector control unit may shut down the operation of the mist collector when the type of the tool used in precision machining is acquired. This can suppress a decrease in precision machining accuracy.

[0094] (4) The first invention is a control device, wherein the acquisition unit may start acquiring the type of the installed tool when the installation of the tool is detected. Thus, even if the tool is replaced, the operation of the mist collector can be turned on or off based on the type of the replaced tool.

[0095] (5) The first invention is a control device, wherein the collector control unit can determine whether to allow or prohibit the operation of the mist collector before starting the processing of the processing object. This can prevent the mist collector from being turned on before the processing starts when the type of tool that prohibits the operation of the mist collector is used for processing.

[0096] (6) The first invention is a control device, wherein the collector control unit may stop driving the mist collector after a predetermined time has passed since the processing of the object to be processed is completed, when a determination is made that the operation of the mist collector is permitted. This can reduce the amount of mist remaining in the processing area after the processing is completed, and can suppress excessive increase in power consumption of the mist collector.

[0097] (7) The first invention is a control device, which may also include an alarm output unit (84) for outputting an alarm when an abnormality occurs in the machine tool, and when the alarm is output when the operation of the mist collector is turned on, the collector control unit stops the operation of the mist collector. This can prevent the mist collector from continuing to operate in an emergency situation of the machine tool.

[0098] (8) A second invention is a machine tool (10) having the control device of the first invention. Since the machine tool has the control device of the first invention, it is possible to suppress a decrease in machining accuracy.

[0099] (9) The second invention is a machine tool that may further include a sub-control device (82) that controls the mist collector instead of the collector control unit when the control device stops. Thus, the mist collector can be controlled even when the control device stops.

[0100] (10) The third invention is a control method, which controls a machine tool by a computer (14), wherein the machine tool has a mist collector for recovering mist in a processing area, and processes a processing object in the processing area, and the control method includes: an acquisition step (S1), acquiring the type of a tool used for processing the processing object; a determination step (S2), determining whether to allow or prohibit the operation of the mist collector based on the type of the tool; and a collector control step (S3), turning on the operation of the mist collector when a determination is made that the operation of the mist collector is allowed, and turning off the operation of the mist collector when a determination is made that the operation of the mist collector is prohibited.

[0101] Thus, for example, when a processing object is processed by a tool used in precision processing, the recovery of mist by the mist collector can be stopped. Therefore, the vibration generated by the mist collector can be suppressed from affecting the processing of the processing object. As a result, the reduction in processing accuracy can be suppressed. Explanation of symbols

[0102] 10, 101... Machine tools 12... Processing machines 14, 142 ... control device 32 ... coolant supply device 34…Mist collector 48…Processing area 72…Processing program 74…Processing control unit 76 ... Acquisition unit 78 ... Determination unit 80 ... collector control unit 82 ... auxiliary control device 84 ...Alarm output unit TB ...Judgment table

Claims

1. A control device (14) for a machine tool (10), the machine tool comprising a mist collector (34) for collecting mist in a processing area (48), wherein a processing object is processed in the processing area, the control device (14) comprising: an acquisition unit (76) for acquiring a type of a tool (16) used for processing the processing object; A determination unit (78) for determining whether to allow or prohibit the operation of the mist collector according to the type of the tool; and The collector control unit (80) starts the operation of the mist collector when it is determined that the operation of the mist collector is permitted, and stops the operation of the mist collector when it is determined that the operation of the mist collector is prohibited.

2. The control device according to claim 1, characterized in that: The collector control unit uses a determination table (TB) that associates type information indicating the type of the tool with status information indicating whether the operation of the mist collector is permitted or prohibited.

3. The control device according to claim 1 or 2, characterized in that: When the type of the tool used in precision machining is acquired, the collector control unit turns off the operation of the mist collector.

4. The control device according to any one of claims 1 to 3, characterized in that: When the attachment of the tool is detected, the acquisition unit starts to acquire the type of the attached tool.

5. The control device according to any one of claims 1 to 4, characterized in that: The collector control unit determines whether to permit or prohibit the operation of the mist collector before starting processing of the object to be processed.

6. The control device according to any one of claims 1 to 5, characterized in that: When the determination is made to permit the operation of the mist collector, the collector control unit stops the driving of the mist collector after a predetermined time has elapsed since the processing of the object has been completed.

7. The control device according to any one of claims 1 to 6, characterized in that: It also includes an alarm output unit (84) for outputting an alarm when an abnormality occurs in the machine tool. When the alarm is outputted while the operation of the mist collector is turned on, the collector control unit stops the operation of the mist collector.

8. A machine tool, characterized in that: A control device according to any one of claims 1 to 7.

9. The machine tool according to claim 8, characterized in that A sub-control device (82) is further provided, which controls the mist collector in place of the collector control unit when the control device stops.

10. A control method for controlling a machine tool by a computer (14), wherein the machine tool is provided with a mist collector for collecting mist in a processing area, and a processing object is processed in the processing area, wherein the control method is characterized by comprising: An acquisition step (S1) of acquiring the type of a tool used for processing the processing object; A determination step (S2), determining whether to allow or prohibit the operation of the mist collector according to the type of the tool; as well as The collector control step (S3) starts the operation of the mist collector when it is determined that the operation of the mist collector is permitted, and turns off the operation of the mist collector when it is determined that the operation of the mist collector is prohibited.

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