JP2018158402A - Machining apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machining apparatus that enables quick change of the operating condition of a cooling device for cooling hydraulic fluid used for a fluid bearing.SOLUTION: A machining apparatus (grinder 1) comprises: a rotatable shaft (grinding wheel shaft 24); a fluid bearing (hydrostatic fluid bearing 25) for rotatably supporting the rotatable shaft 24; a motor (grinding wheel shaft drive motor 26) for rotatably driving the rotatable shaft 24; a circulating device (hydraulic oil circulating device 40) for circulating hydraulic fluid through circulating passages (an oil supply passage 27, an oil supply passage 28, and an oil reflux passage 29) being provided between the circulating device and the fluid bearing 25; a cooling device (hydraulic oil cooling device 60) that is provided in the circulating passages 27, 28, 29, and which cools the hydraulic fluid (hydraulic oil); a process control device 50 for controlling operation of the motor 26 and the circulating device 40, and rotating a rotary tool (grinding wheel 23) mounted on the rotatable shaft 24, thereby processing a workpiece W; and a cooling control device 70 that can receive a command from the process control device 50, and which switches and controls the operation of the cooling device 60 in response to the command from the process control device 50.SELECTED DRAWING: Figure 2A

Description

  The present invention relates to a machine tool.

  In line production, when a machine tool is stopped due to setup change, tool change, failure, etc., or when a break time for line work is entered, a standby time during which production is not performed occurs. For example, when the machine tool is a grinding machine, the grinding wheel continues to rotate during the standby time to maintain the processing accuracy after returning from the standby state, and the temperature and thermal displacement of each element of the grinding machine are controlled. It is stabilized. However, continuing the rotation of the grinding wheel during the standby time is not preferable from the viewpoint of energy saving because it continues to consume power.

  When rotation of the grinding wheel is stopped during the standby time, the temperature of the hydraulic oil supplied to the hydrostatic bearing of the grinding wheel shaft is not affected by heat generated by the rotation of the grinding wheel shaft, but increases to some extent due to pressure loss. Therefore, if the operation of the hydraulic oil cooling device is stopped, the temperature of the hydraulic oil will continue to rise, and if the hydraulic oil cooling device continues to operate as it is, the temperature of the hydraulic oil will decrease too much. It becomes difficult to stabilize the temperature and thermal displacement of each element of the grinding machine. For example, Patent Documents 1 and 2 describe devices that can change the operating state of a hydraulic oil cooling device used in hydrostatic bearings.

JP-A-9-210063 JP 2004-116580 A

  Since the apparatus described in Patent Document 1 is an apparatus that adjusts the temperature of hydraulic oil according to changes in temperature, it is difficult to apply to a machine tool that adjusts the temperature of hydraulic oil while the grinding wheel is rotating. On the other hand, the device described in Patent Document 2 is a device that changes the operating state of the cooling device according to the temperature of the hydraulic oil, or changes the operating state of the cooling device according to the rotational speed of the rotation motor of the grinding wheel. is there. However, in the apparatus described in Patent Document 2, since the rotation speed of the grinding wheel is 0, that is, it takes time until the grinding wheel stops rotating, there is a tendency that the change of the operating state of the cooling device is delayed.

  This invention is made | formed in view of such a situation, and it aims at providing the machine tool which can change rapidly the driving | running state of the cooling device of the hydraulic fluid used for a fluid bearing.

  A machine tool according to the present invention includes a rotating shaft, a fluid bearing that rotatably supports the rotating shaft, a motor that rotationally drives the rotating shaft, and a circulation path provided between the fluid bearings. A circulating device that circulates, a cooling device that is provided in the circulation path, cools the working fluid, controls the operation of the motor and the circulating device, and rotates a rotating tool mounted on the rotating shaft to rotate the workpiece. A processing control device that performs the processing of, and a cooling control device that is capable of receiving a command from the processing control device and that switches and controls the operation of the cooling device in accordance with the command from the processing control device, And the cooling control device keeps the temperature of the fluid bearing constant when the command is received in a state where the rotating shaft rotates and the working fluid is circulated and supplied from the circulation device to the fluid bearing. The cooling device is controlled so that the cooling capacity suitable for rotation is supplied by the cooling device, and the command is received in a state where the rotating shaft stops rotating and the working fluid is circulated and supplied from the circulation device to the fluid bearing. Then, control is performed so that the cooling device supplies a cooling capacity at the time of stoppage lower than the cooling capacity at the time of rotation suitable for keeping the temperature of the fluid bearing constant.

  Since the cooling control device switches and controls the operation of the cooling device in accordance with a command from the processing control device, when the command to rotate the rotation shaft or the command to stop the rotation of the rotation shaft is received, the operation state of the cooling device is changed. It can be changed quickly. In particular, if a command to stop the rotation of the rotating shaft is received, the operating capacity of the cooling device can be reduced in advance without waiting for the rotation of the rotating shaft to stop. Can be obtained. In addition, the temperature of the fluid bearing can be kept constant despite the rotation and stop of the rotation shaft.

1 is a plan view of a grinding machine as an example of a machine tool. It is a block diagram which shows a process control apparatus and a cooling control apparatus. It is a figure which shows the operation panel of a process control apparatus. It is a flowchart for demonstrating operation | movement of the process control apparatus and cooling control apparatus of FIG. 2A. It is a flowchart for demonstrating operation | movement of the process control apparatus and cooling control apparatus of a continuation of FIG. 3A. It is a figure which shows the time-dependent change of the temperature of a machine tool. It is a block diagram which shows the 1st modification of a process control apparatus and a cooling control apparatus. It is a block diagram which shows the 2nd modification of a process control apparatus and a cooling control apparatus.

  (1. Configuration of Machine Tool) A table traverse type cylindrical grinder will be described as an example of the machine tool of the present embodiment. As shown in FIG. 1, the grinding machine 1 includes a bed 10, a table 11, a headstock 13, a tailstock 17, a grindstone base 21, a hydraulic oil circulation device 40, a processing control device 50, a hydraulic oil cooling device 60, and cooling control. The apparatus 70 etc. are provided. Although not shown in the figure, coolant (grinding fluid) is supplied to the grinding wheel 23 of the grinding wheel base 21. In FIG. 1, the traverse direction is the Z-axis direction, the horizontal direction perpendicular to the traverse direction is the X-axis direction, and the vertical direction perpendicular to the traverse direction is the Y-axis direction.

  A table 11 is guided and supported on the bed 10 by a Z-axis servomotor 12 so as to be movable in the Z-axis direction. On the table 11, a headstock 13 that rotatably supports the master spindle Cm is installed, and a center 14 that supports one end of the workpiece W is attached to the tip of the master spindle Cm. The master spindle Cm is advanced and retracted by a predetermined amount in the Z-axis direction by the advance / retreat drive device 15 and is rotationally driven by the master servo motor 16.

  Further, a tailstock 17 is installed on the table 11 at a position facing the headstock 13. A slave main shaft Cs is rotatably supported on the tailstock 17 coaxially with the master main shaft Cm, and a center 18 for supporting the other end of the workpiece W is attached to the tip of the slave main shaft Cs. The slave main shaft Cs is advanced and retracted in the Z-axis direction by the center pressurizing control servo motor 19 and is rotated by the slave servo motor 20 in synchronization with the master main shaft Cm.

  In addition, at the rear position of the table 11 on the bed 10, the grindstone table 21 is guided and supported by the X-axis servomotor 22 so as to be movable in the X-axis direction orthogonal to the Z-axis direction. A grinding wheel 23 (rotary tool) is supported on the grinding wheel base 21 coaxially with a grinding wheel shaft 24 (rotating shaft). The grindstone shaft 24 is supported by a hydrostatic fluid bearing 25 so as to be rotatable about an axis parallel to the Z-axis direction, and is rotationally driven by a grindstone shaft drive motor 26.

  The hydraulic oil circulation device 40 includes a hydraulic oil storage tank 41, a hydraulic oil pump 42, and the like. The hydraulic oil storage tank 41 is installed beside the bed 10 and stores hydraulic oil (working fluid). The hydraulic oil pump 42 is attached to the hydraulic oil storage tank 41. The hydraulic oil stored in the hydraulic oil storage tank 41 is supplied from the hydraulic oil pump 42 to the hydraulic oil cooling device 60 through the supply oil passage 27, and is supplied from the hydraulic oil cooling device 60 to the hydrostatic fluid bearing 25 through the supply oil passage 28. Then, the fluid is returned from the hydrostatic bearing 25 to the hydraulic oil storage tank 41 through the reflux oil passage 29. The supply oil paths 27 and 28 and the reflux oil path 29 are circulation paths for circulating the working oil.

  The machining control device 50 controls the motors 12, 16, 19, 20, 22, 26 and the hydraulic oil pump 42 to rotate the workpiece W and the grinding wheel 23 around the Z axis, and to the workpiece W. The workpiece W is ground by relative movement of the grinding wheel 23 in the Z-axis direction and the X-axis direction. As the grinding process, there are empty grinding, rough grinding, finish grinding, and fine grinding in which the rotational speed of the grinding wheel 23 is constant and the feed speed of the grinding wheel 23 is changed. Moreover, although mentioned later for details, the process control apparatus 50 communicates with the cooling control apparatus 70, and according to rotation of the grinding wheel 23 or rotation stop of the grinding wheel 23, the hydraulic oil cooling apparatus 60 of the cooling control apparatus 70 is stopped. The switching control of the cooling operation is performed.

The hydraulic oil cooling device 60 cools the hydraulic oil whose temperature has risen discharged from the hydrostatic fluid bearing 25 through the supply oil passage 28.
As described above, the cooling control device 70 communicates with the machining control device 50, and switches the hydraulic oil cooling operation by the hydraulic oil cooling device 60 according to the rotation of the grinding wheel 23 or the rotation stop of the grinding wheel 23. To do. Although details will be described later, the cooling operation control may be performed by inputting a detection signal from a temperature sensor 77 that detects the temperature of the bed 10 (the temperature of the grinding machine 1). In this case, the correlation between the temperature of the bed 10 and the temperature of the front surface of the grindstone shaft 24 is obtained by measurement. The reason why the temperature sensor 77 is provided in the bed 10 is that the temperature detected by the temperature sensor 77 is small because the heat capacity is large. In addition, the detection location of the temperature sensor 77 is not limited to the bed 10, and for example, the front surface of the grindstone shaft 24 may be directly detected.

(2. Configuration of processing control device and cooling control device)
Next, the configuration of the machining control device 50 and the cooling control device 70 will be described with reference to FIG. 2A. 2A, the machining control device 50 includes an external communication unit 51, an NC code setting storage unit 52, an NC program storage unit 53, an operation panel 54, a display screen 55, and a machining control unit 56. The cooling control device 70 includes an external communication unit 71, a cooling condition setting storage unit 72, an operation panel 73, a display screen 74, and a cooling control unit 75.

  The external communication unit 51 of the machining control device 50 communicates with the external communication unit 71 of the cooling control device 70 wirelessly or by wire, and sends a rotation start command for the grinding wheel 23 or a rotation stop command for the grinding wheel 23 to the cooling control device 70. Send. The NC code setting storage unit 52 stores operations set for the NC code, for example, rotation start and rotation stop start of the grinding wheel 23, feed speed and feed position of the grinding wheel base 21, and the like. The NC program storage unit 53 stores, for example, an NC program for grinding the workpiece W. The operation panel 54 is a touch panel, for example, and is operated by an operator. The display screen 55 is, for example, a liquid crystal display, and information necessary for the operator is displayed by operating the operation panel 54. The machining control unit 56 reads the NC program from the NC program storage unit 53 and controls machining of the workpiece W.

  The processing control device 50 is connected to the control box 50A with a cable (not shown), and is connected to a relay (operating oil circulating device 40, hydraulic oil cooling after pressing an operation preparation button to be described later) built in the control box 50A. The device 60, the coolant supply device, etc.) are started up), the PLC, the drive circuit (the one that drives the servo motors 12, 16, 19, 20, 22, 26), etc. are operated. The control box 50A is provided with a power switch 50B that turns on the machining control device 50 when the power is turned on and starts up the machining control device 50, and turns off the power of the machining control device 50 when turned off. Even if the power switch is turned on, all devices other than the processing control device 50 (such as the hydraulic fluid circulation device 40, the hydraulic fluid cooling device 60, and the coolant supply device) do not start up.

  As shown in FIG. 2B, the operation panel 54 is provided with an operation preparation button 54b, an emergency stop button 54a, a grindstone axis start button 54c, a grindstone axis stop button 54d, and an energy saving grindstone axis stop button 54e. When the operation preparation button 54a is pressed, all devices are started up, and when the emergency stop button 54b is pressed, all devices are stopped. However, only the hydraulic oil circulation device 40 stops after 3 minutes, for example, when the timer works.

  The cooling condition setting storage unit 72 of the cooling control device 70 stores the cooling condition of the hydraulic oil cooling device 60 that is set. The operation panel 73 is a touch panel, for example, and is operated by an operator. The display screen 74 is a liquid crystal display, for example, and information necessary for the operator is displayed by operating the operation panel 73. The cooling control unit 75 controls the cooling operation of the hydraulic oil cooling device 60. In the cooling condition setting storage unit 72, an operation mode is prepared as a menu. As a submenu of the operation mode, a set temperature following operation performed while the grinding wheel 23 is rotating and an efficient operation performed while the grinding wheel 23 is stopped are prepared.

  As setting temperature follow-up operation, several setting items such as setting temperature and PID set value are prepared. As the efficient operation, several setting items such as efficiency and PID set values are prepared. When there are several patterns for both the set temperature follow-up operation and the efficiency operation, it takes time to set each time the pattern is changed. Further, only one set value for the set temperature follow-up operation and one set value for the efficiency operation can be registered without using user registration. That is, the set temperature, efficiency, and PID set value can be set for each type of operation. As another operation mode, the first temperature follow-up operation performed while the grinding wheel 23 is rotating as the pattern 1 is registered, and the second temperature follow-up operation performed while the grinding wheel 23 is stopped as the pattern 2 is registered. Good.

  The preset temperature follow-up operation means that the hydraulic oil cooling device 60 is operated with the cooling capacity at the time of rotation so that the detected temperature of the hydraulic oil by the temperature sensor 77 becomes a set temperature, for example, 20 degrees of room temperature while the grinding wheel 23 is rotating. Say. The efficiency operation means, for example, that the cooling efficiency is 100% so that the temperature of the hydrostatic fluid bearing 25 can be prevented from rising due to the circulation of the hydraulic oil by the hydraulic oil circulation device 40 while the grinding wheel 23 is stopped. On the other hand, it means that the hydraulic oil cooling device 60 is operated with a cooling capacity at the time of stop that is lower than the cooling capacity at the time of rotation so that the efficiency is only about 13%.

  The first temperature follow-up operation means that the hydraulic oil cooling device 60 is rotated by the cooling capability during rotation so that the detected temperature of the hydraulic oil by the temperature sensor 77 is set to a first set temperature, for example, 20 ° C. while the grinding wheel 23 is rotating. It means driving. The second temperature following operation is a hydraulic oil cooling device 60 so that the temperature detected by the temperature sensor 77 is higher than the first set temperature, for example, 23 degrees, while the grinding wheel 23 is stopped rotating. Is operated with a cooling capacity at the time of stoppage lower than the cooling capacity at the time of rotation.

  (3. Operations of Processing Control Device and Cooling Control Device) Next, operations of the processing control device 50 and the cooling control device 70 shown in FIG. 2A will be described with reference to FIGS. 3A and 3B. In the cooling condition setting storage unit 72 of the cooling control device 70, parameters such as a set temperature and PID are stored as a submenu of the operation mode in the case of set temperature following operation, and parameters such as efficiency are stored in the case of efficient operation. It is remembered. Then, the control operation rotates the grinding wheel 23 in order to process the workpiece W, and stops the rotation of the grinding wheel 23 because troubles of other machine tools occur on the same line during the processing. A case where the grinding wheel 23 is rotated in order to rework the workpiece W will be described.

  The operator turns on the power switch 50B to turn on the machining control device 50, presses the operation preparation button, and presses the grindstone axis start button 54c. When the grinding wheel axis start button 54c is pressed, the machining control unit 56 automatically generates an NC code for starting the rotation of the grinding wheel 23 (step S1 in FIG. 3A), drives the grinding wheel axis drive motor 26, and The rotation start NC code is sent to the NC code setting storage unit 52 (step S2 in FIG. 3A). Then, the NC code setting storage unit 52 sends a command to set the operation mode to the set temperature following operation to the machining control unit 56 (step S3 in FIG. 3A).

  The processing control unit 56 transmits a set temperature following operation setting command from the external communication unit 51 to the external communication unit 71 and sends it to the cooling control unit 75 (step S4 in FIG. 3A). When receiving the set temperature following operation setting command from the processing control unit 56, the cooling control unit 75 operates the hydraulic oil cooling device 60 in the set temperature following operation (step S5 in FIG. 3A). During steps S1-S5, the machining control device 50 performs the warm-up operation of the grinding machine 1, so that the temperature of the grinding machine 1 is changed from a temperature T1 close to room temperature to a stable temperature T2, as shown in FIG. It rises (time t1-t2 in FIG. 4). And the process control part 56 processes the workpiece W by starting a process program (step S6 of FIG. 3A). During this processing, the cooling control device 70 operates the hydraulic oil cooling device 60 in a set temperature following operation, so that the temperature of the grinding machine 1 is stable at the temperature T2 as shown in FIG. 4 (FIG. 4). T2-t3).

  When troubles of other machine tools occur on the same line, the operator presses the energy-saving grindstone axis stop button 54e after the machining cycle ends. The processing control unit 56 determines whether or not the energy saving grindstone axis stop button 54e has been pressed (step S7 in FIG. 3A). If the energy saving grindstone axis stop button 54e has not been pressed, the process control unit 56 returns to step S5 and performs cooling control. The unit 75 continues the operation of the hydraulic oil cooling device 60 in the set temperature following operation, and the processing control unit 56 continues processing the workpiece W.

  On the other hand, in step S7, when the energy saving grindstone axis stop button 54e is pressed (time t3 in FIG. 4), the machining control unit 56 automatically generates an NC code for energy saving grindstone axis stop (step S8 in FIG. 3A). The driving of the grindstone shaft drive motor 26 is stopped, and an NC code for starting the energy saving grindstone shaft stop is sent to the NC code setting storage unit 52 (step S9 in FIG. 3A). Then, the NC code setting storage unit 52 sends a command to set the operation mode to the efficient operation to the machining control unit 56 (step S10 in FIG. 3B).

  The processing control unit 56 transmits an efficiency operation setting command from the external communication unit 51 to the external communication unit 71 and sends it to the cooling control unit 75 (step S11 in FIG. 3B). When the cooling control unit 75 receives the efficiency operation setting command from the processing control unit 56, the cooling control unit 75 switches from the set temperature following operation to the efficiency operation and operates the hydraulic oil cooling device 60 (step S12 in FIG. 3B). During steps S7 to S12, the cooling control device 70 switches from the set temperature following operation to the efficient operation and operates the hydraulic oil cooling device 60. Therefore, as shown in FIG. 4, the temperature of the grinding machine 1 is the temperature T2. And stable (time t3-t4 in FIG. 4).

  The operator presses the grindstone axis activation button 54c when troubles of other machine tools are resolved on the same line. The processing control unit 56 determines whether or not the grindstone axis activation button 54c has been pressed (step S13 in FIG. 3B). If the grindstone axis activation button 54c has not been depressed, the process control unit 56 returns to step S12 and operates in the efficiency operation. The operation of the oil cooling device 60 is continued. On the other hand, in step S13, when the grinding wheel axis activation button 54c is pressed (time t4 in FIG. 4), the machining control unit 56 automatically generates an NC code for starting the rotation of the grinding wheel 23 (step S14 in FIG. 3B). Then, the grinding wheel shaft drive motor 26 is driven, and the NC code for starting the rotation of the grinding wheel 23 is sent to the NC code setting storage unit 52 (step S15 in FIG. 3B).

  Then, the NC code setting storage unit 52 sends a command to set the operation mode to the set temperature following operation to the machining control unit 56 (step S16 in FIG. 3B). The processing control unit 56 transmits a set temperature following operation setting command from the external communication unit 51 to the external communication unit 71 and sends it to the cooling control unit 75 (step S17 in FIG. 3B). When receiving the set temperature following operation setting command from the processing control unit 56, the cooling control unit 75 switches the efficiency operation to the set temperature following operation and operates the hydraulic oil cooling device 60 (step S18 in FIG. 3B). Then, the machining control unit 56 starts the machining program and resumes machining of the workpiece (step S19 in FIG. 3B). During this processing, the cooling control device 70 switches the efficiency operation to the set temperature following operation and operates the hydraulic oil cooling device 60, so that the temperature of the grinding machine 1 is stabilized at the temperature T2, as shown in FIG. (Time t4-t5 in FIG. 4).

  In the case of just before the end of work, the operator presses the emergency stop button 54b after the machining cycle ends (time t5 in FIG. 4). Thereby, the drive of the grindstone shaft drive motor 26 is stopped. However, since the grinding wheel 23 rotates by inertia, only the hydraulic oil circulation device 40 stops after 3 minutes, for example, with a timer. Then, the operator turns off the power switch 50B to turn off the power of the machining control device 50 and ends all the processes. In the case where the first temperature follow-up operation and the second temperature follow-up operation are stored in the cooling condition setting storage unit 72 of the cooling control device 70 as the submenu of the operation mode, when the grindstone shaft start button 54c is pressed, When the hydraulic oil cooling device 60 is operated in the one-temperature following operation and the energy saving grindstone shaft stop button 54e is pressed, the hydraulic oil cooling device 60 is operated in the second temperature following operation, and the same processing as described above can be performed.

(4. First modification of processing control device and cooling control device)
Next, a first modification of the machining control device 50 and the cooling control device 70 will be described with reference to FIG. 5 shown corresponding to FIG. 2A. In FIG. 5, the same components as those in FIG. 2A are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 5, the machining control device 150 does not include the NC code setting storage unit 52 of FIG. 2A, and the cooling control device 170 has the same NC code setting storage as the NC code setting storage unit 52 of FIG. 2A. The configuration is different from the machining control device 50 of FIG. 2A in that the portion 76 is provided.

  (5. Operations of Processing Control Device and Cooling Control Device of First Modification) Next, operations of the processing control device 150 and the cooling control device 170 shown in FIG. 5 will be described. The operations of the machining control device 150 and the cooling control device 170 shown in FIG. 5 are basically the same as the operations of the machining control device 50 and the cooling control device 70 shown in FIG. 2A, but differ in the following points.

  That is, in FIG. 2A, the processing control unit 56 sends the generated predetermined NC code to the NC code setting storage unit 52 (steps S2 and S9 in FIG. 3A, and step S15 in FIG. 3B). The NC code setting storage unit 52 sends a predetermined operation setting command corresponding to the predetermined NC code to the machining control unit 56 (Step S3 in FIG. 3A, Steps S11 and S16 in FIG. 3B). The processing control unit 56 transmits a predetermined operation setting command to the cooling control unit 75 via the external communication units 51 and 71. Then, the cooling control unit 75 reads the predetermined operation mode corresponding to the received predetermined operation setting command from the cooling condition setting storage unit 72 and operates the hydraulic oil cooling device 60 (steps S4 in FIG. 3A and FIG. 3B). Steps S11 and S17).

  On the other hand, in FIG. 5, the machining control unit 56 transmits the generated predetermined NC code to the NC code setting storage unit 76 via the external communication units 51 and 71. The NC code setting storage unit 76 sends a predetermined operation setting command corresponding to the received predetermined NC code to the cooling control unit 75. Then, the cooling control unit 75 reads the predetermined operation mode corresponding to the predetermined operation setting command from the cooling condition setting storage unit 72 and operates the hydraulic oil cooling device 60.

(6. Second modification of machining control device)
Next, a second modification of the machining control device 250 will be described with reference to FIG. 6 shown corresponding to FIG. 2A. In FIG. 6, the same components as those in FIG. 2A are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in FIG. 6, the machining control device 250 is different from the machining control device 50 in FIG. 2A in that a new stop time count program storage unit 57 is provided.

  (7. Operation of Processing Control Device of Second Modification) Next, the operation of the processing control device 250 shown in FIG. 6 will be described. The operations of the machining control device 250 and the cooling control device 70 shown in FIG. 6 are basically the same as the operations of the machining control device 50 and the cooling control device 70 shown in FIG. 2A, but differ in the following points.

  That is, in FIG. 2A, when the worker enters a break time and presses the energy saving grindstone axis stop button 54e, the machining control unit 56 automatically generates an NC code for energy saving grindstone axis stop (step S8 in FIG. 3A). In the machining control device 50, when the operator forgets to press the energy saving grindstone shaft stop button 54e, the NC code for stopping the energy saving grindstone shaft is not automatically generated, so the rotation of the grinding wheel 23 cannot be stopped.

  On the other hand, in FIG. 6, the stop time count program storage unit 57 operates the stop time count set to, for example, 5 minutes in the stop time count program when there is an instruction to end the machining cycle. Then, the machining control unit 56 automatically generates an NC code for stopping the energy-saving grindstone shaft when 5 minutes have elapsed. Thereby, even if it is a case where an operator forgets to push the energy-saving grindstone axis stop button 54e, rotation of the grinding wheel 23 can be stopped forcibly. The stop time count program storage unit 57 may be provided in the machining control device 150 shown in FIG.

(8. Effects of the embodiment)
The machine tool (grinding machine 1) of this embodiment includes a rotating shaft (grinding wheel shaft 24), a fluid bearing (static pressure fluid bearing 25) that rotatably supports the rotating shaft 24, and a motor that rotationally drives the rotating shaft 24. A circulation device (hydraulic oil circulation device 40) that circulates the working fluid in a circulation path (supply oil passage 27, supply oil passage 28, and reflux oil passage 29) provided between the (grinding wheel shaft drive motor 26) and the fluid bearing 25. ), A cooling device (working oil cooling device 60) for cooling the working fluid (working oil), and the operation of the motor 26 and the circulation device 40 are provided in the circulation paths 27, 28, 29, and the rotating shaft 24 is controlled. It is possible to receive commands from the processing control devices 50, 150, 250 for processing the workpiece W by rotating the mounted rotary tool (grinding wheel 23) and the processing control devices 50, 150, 250. Control device 50, 150, 250 Includes a cooling control unit 70, 170 for controlling by switching operation of the cooling apparatus 60 in accordance with et directives a.

  The cooling control devices 70 and 170 keep the temperature of the fluid bearing 25 constant when the rotation shaft 24 rotates and the command for the state in which the working fluid is circulated and supplied from the circulation device 40 to the fluid bearing 25 is received. The cooling device 60 is controlled so that the cooling capacity suitable for rotation is supplied by the cooling device 60, and the rotation shaft 24 stops rotating and the command of the state in which the working fluid is circulated and supplied from the circulation device 40 to the fluid bearing 25 is received. At this time, the cooling device 60 is controlled so as to supply the cooling capacity at the time of stoppage lower than the cooling capacity at the time of rotation suitable for keeping the temperature of the fluid bearing 25 constant.

  Since the cooling control devices 70 and 170 switch and control the operation of the cooling device 60 in accordance with commands from the processing control devices 50, 150 and 250, the command for rotating the rotating shaft 24 or the rotation of the rotating shaft 24 stops. When the command is received, the operating state of the cooling device 60 can be quickly changed. In particular, if a command to stop the rotation of the rotating shaft 24 is received, the operating capacity of the cooling device 60 can be reduced in advance without waiting for the rotation of the rotating shaft 24 to stop. Energy saving effect can be obtained. The temperature of the fluid bearing 25 can be kept constant despite the rotation and stop of the rotating shaft 24.

  In addition, the cooling device 60 includes a temperature sensor 77 that detects the temperature of the machine tool 1, and the cooling control devices 70 and 170 include a cooling condition setting storage unit 72 that stores a parameter for setting temperature following operation and a parameter for efficiency operation. Prepare.

  When the machining control devices 50, 150, 250 or the cooling control devices 70, 170 receive a rotation start command for the rotating shaft 24, the processing control devices 50, 150, 250 generate and issue a setting command for setting temperature follow-up operation, and a rotation stop command for the rotating shaft 24. If it receives, it has NC code setting storage parts 52 and 76 which generate and issue setting instructions of efficiency operation, and cooling control devices 70 and 170 are setting instructions of setting temperature follow-up operation which NC code setting storage parts 52 and 76 issue. Alternatively, the operation state is changed based on the setting command for efficient operation. Thereby, since the cooling control devices 70 and 170 control the cooling device 60 by the efficient operation when the rotation shaft 24 stops rotating, the power consumption can be greatly suppressed, and a great energy saving effect can be obtained.

  Further, the machining control devices 50, 150, 250 include an energy saving grindstone shaft stop button 54e, and when the energy saving grindstone shaft stop button 54e is pressed, the rotation of the rotary shaft 24 is stopped, and the cooling control devices 70, 170 are The operation state is changed and executed based on the efficiency operation setting command issued by the NC code setting storage units 52 and 76. Thereby, when trouble of the machine tool occurs or when the worker enters a break time, the power consumption can be significantly suppressed by the operator's operation, and a great energy saving effect can be obtained.

  Further, the machining control devices 50, 150, and 250 include a stop time count program storage unit 57 that forcibly stops the rotation of the rotary shaft 24 after the set predetermined time has elapsed if there is a machining cycle end command. As a result, when a trouble occurs in the machine tool or when the worker enters a break time, the rotation of the rotary shaft 24 is forcibly stopped even if the worker forgets to press the energy saving grindstone shaft stop button 54e. As a result, power consumption can be greatly reduced, and a large energy saving effect can be obtained.

  In addition, the cooling device 60 includes a temperature sensor 77 that detects the temperature of the machine tool 1, and the cooling control device includes a parameter for a first temperature following operation in which the temperature detected by the temperature sensor is a first set temperature, and the temperature sensor. A cooling condition setting storage unit that stores a second temperature follow-up operation parameter that is a second set temperature that is higher than the first set temperature, and the processing control device or the cooling control device includes the rotating shaft When the rotation start command is received, the setting command for the first temperature tracking operation is generated and issued. When the rotation stop command for the rotating shaft is received, the NC code is generated and generated by setting the second temperature tracking operation. The cooling control device changes an operation state based on the setting command for the first temperature following operation or the setting command for the second temperature following operation issued by the NC code setting storage unit. To run.

  Since the cooling controller 70 switches and controls the operation of the cooling device 60 in accordance with commands from the processing controllers 50, 150, 250, the cooling control device 70 stops the rotation of the rotating shaft 24. If the instruction | command to perform is received, the driving | running state of the cooling device 60 can be changed rapidly. In particular, if a command to stop the rotation of the rotating shaft 24 is received, the operating capacity of the cooling device 60 can be reduced in advance without waiting for the rotation of the rotating shaft 24 to stop. Energy saving effect can be obtained. The temperature of the fluid bearing 25 can be kept constant despite the rotation and stop of the rotating shaft 24. Then, since the machining control devices 50, 150, 250 instruct the cooling control devices 70, 170 to perform the temperature tracking operation at an arbitrary temperature, the machining control devices 50, 150, 250 can be adjusted to the installation environment of the machine tool 1.

DESCRIPTION OF SYMBOLS 1: Grinding machine, 10: Bed, 21: Grinding wheel stand, 23: Grinding wheel, 24: Grinding wheel shaft, 25: Hydrostatic fluid bearing, 40: Hydraulic oil circulation device, 50: Processing control device, 51: External communication part, 52, 76: NC code setting storage unit, 53: NC program storage unit, 54a: Operation preparation button, 54b: Emergency stop button, 54c: Wheel axis start button, 54d: Wheel axis stop button, 54e: Energy saving wheel axis stop button 56: Processing control unit, 57: Stop time count program storage unit, 60: Hydraulic oil cooling device, 70: Cooling control device, 71: External communication unit, 72: Cooling condition setting storage unit, 75: Cooling control unit, 77 : Temperature sensor

Claims (5)

A rotation axis;
A fluid bearing that rotatably supports the rotating shaft;
A motor that rotationally drives the rotating shaft;
A circulation device for circulating a working fluid in a circulation path provided between the fluid bearing;
A cooling device provided in the circulation path for cooling the working fluid;
A machining control device for controlling the operation of the motor and the circulation device, and for machining a workpiece by rotating a rotary tool mounted on the rotary shaft;
A cooling control device capable of receiving a command from the processing control device, and switching and controlling the operation of the cooling device according to the command from the processing control device;
With
The cooling control device keeps the temperature of the fluid bearing constant when the command is received in a state where the rotating shaft rotates and the working fluid is circulated and supplied from the circulation device to the fluid bearing. The cooling device is controlled so as to supply a suitable cooling capacity at the time of rotation, and the rotation shaft is stopped from rotating and the command is received from the circulation device to circulate and supply the working fluid to the fluid bearing. And a control device for controlling the cooling device to supply a cooling capacity at the time of stoppage lower than the cooling capacity at the time of rotation suitable for keeping the temperature of the fluid bearing constant. The cooling device includes a temperature sensor that detects the temperature of the machine tool,
The cooling control device includes a cooling condition setting storage unit that stores a parameter of the set temperature following operation and a parameter of the efficiency operation,
The processing control device or the cooling control device generates and issues a setting command for the set temperature follow-up operation when receiving a rotation start command for the rotating shaft, and receives the rotation stop command for the rotating shaft when receiving the rotation stop command for the rotating shaft. An NC code setting storage unit for generating and issuing a setting command is provided,
2. The machine device according to claim 1, wherein the cooling control device is executed by changing an operation state based on a setting command for the set temperature following operation or a setting command for the efficiency operation issued by the NC code setting storage unit. The processing control device includes an energy saving grindstone axis stop button, and when the energy saving grindstone axis stop button is pressed, stops the rotation of the rotary shaft,
The machine device according to claim 2, wherein the cooling control device is executed by changing an operation state based on a setting command for the efficient operation issued by the NC code setting storage unit.   The said process control apparatus is provided with the stop time count program memory | storage part which forcibly stops rotation of the said rotating shaft, if predetermined | prescribed predetermined time passes, if there exists a process cycle end command. Machine tool. The cooling device includes a temperature sensor that detects the temperature of the machine tool,
The cooling control device includes a parameter for a first temperature follow-up operation in which the temperature detected by the temperature sensor is a first set temperature, and a second set temperature in which the temperature detected by the temperature sensor is higher than the first set temperature. It has a cooling condition setting storage unit that stores parameters for temperature following operation,
The processing control device or the cooling control device generates and issues a setting command for the first temperature follow-up operation when receiving a rotation start command for the rotation shaft, and receives the rotation stop command for the rotation shaft when receiving a rotation stop command for the rotation shaft. An NC code setting storage unit that generates and issues a setting command for two-temperature tracking operation is provided.
2. The cooling control device according to claim 1, wherein the cooling control device is executed by changing an operation state based on a setting command for the first temperature tracking operation or a setting command for the second temperature tracking operation issued by the NC code setting storage unit. Machine tool.

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