JP5482219B2 - Tool cleaning equipment for machine tools - Google Patents

Description

  The present invention relates to a tool cleaning device for a machine tool for cleaning chips and the like adhering to a tool surface mounted on a spindle.

  2. Description of the Related Art Conventionally, machine tools have been designed to improve machining accuracy and tool life by injecting a coolant liquid onto a cutting portion of an object to be cut by a tool. A machine tool such as a recent machining center has a tool changer, and automatically changes a tool composed of a cutting tool and a tool holder.

  When the tool is mounted on the main shaft with chips adhering to the main shaft mounting surface of the tool holder when the tool is changed, the tool is displaced relative to the main shaft, and the cutting accuracy decreases. In order to solve the above-described problems, the conventional machine tool cleans the spindle mounting surface of the tool holder with a coolant liquid or an air blow as a cleaning liquid.

  In Patent Document 1, a cleaning nozzle capable of injecting a coolant liquid is provided at the tip of a spindle, and the cleaning nozzle and an air compressor as an air source are connected, and the coolant liquid is air-assisted to the spindle mounting surface of the tool holder. It proposes a technology to inject while. In patent document 1, the coolant liquid which mixed air wash | cleans the chip etc. which adhere to the spindle mounting surface of a tool holder.

JP 2002-273640 A

  The coolant liquid sprayed to the cutting portion of the workpiece is configured to be sent from a coolant tank to the spray nozzle opening by a pump having a predetermined spray pressure, for example, about 0.03 MPa. A machine tool generally also uses a coolant liquid sprayed from the pump as a cleaning liquid for cleaning chips and the like adhering to the spindle mounting surface of the tool holder. Therefore, the machine tool is configured to branch the coolant liquid to be sent to the cutting location and send it to the cleaning nozzle.

  The coolant liquid sprayed to the cutting location has a main function of lubrication and cooling of the cutting location, and the pump is set to an injection pressure that conveys the coolant fluid. In the tool cleaning, since the cleaning liquid needs to have a function of removing chips and the like adhering to the spindle mounting surface of the tool holder with the injection pressure, a sufficient cleaning effect cannot be obtained with the pump injection pressure as described above.

  In patent document 1, since the mixture of coolant liquid and pressurized air is injected to a tool, the amount of coolant liquid per unit time injected to the tool decreases. In removing chips and the like, it is most effective to wash away with a liquid such as a coolant, and air is inferior in removal efficiency as compared with a cleaning liquid. Moreover, since it is a mixture of the coolant and pressurized air, the supply pressure of the air source, so-called output, is not sufficiently added to the injected coolant. In other words, a high-power air source is required to obtain an injection pressure coolant liquid with an enhanced cleaning effect.

  Further, in the tool cleaning, it is necessary to stably and stably inject a coolant liquid having a predetermined injection pressure within a short time during tool replacement. When the coolant is transported from the coolant tank to the cleaning nozzle, the passage is long and the passage resistance is large. Further, there are factors that hinder responsiveness such as clogging of the filter in the middle of the passage and pump drive pulsation.

  An object of the present invention is to provide a tool cleaning apparatus capable of injecting a high-pressure cleaning liquid having supply stability and responsiveness of the cleaning liquid.

A tool cleaning device for a machine tool according to claim 1, wherein a tank for storing a cleaning liquid for cleaning a tool mounted on a spindle, nozzle means capable of injecting the cleaning liquid stored in the tank into the tool, and the cleaning liquid from the tank. In a tool cleaning apparatus for a machine tool having a cleaning liquid supply means that can be supplied to the nozzle means, the cleaning liquid is disposed between the tank and the nozzle means, stores the cleaning liquid supplied from the cleaning liquid supply means, and stores the cleaning liquid. Is stored in the cleaning liquid storage container, the cleaning liquid passage connecting the nozzle means and the cleaning liquid storage container, the first valve means capable of opening and closing the cleaning liquid passage, and the cleaning liquid storage container. A pressurizing means for pressurizing the cleaning liquid, an air supply means for generating pressurized air, and supplying the pressurized air from the air supply means to the cleaning liquid storage container Provided in the air supply passage so that the pressure of the pressurized air supplied to the cleaning liquid storage container can be adjusted when the cleaning liquid passage is opened by the first valve means. Second valve means, wherein the first valve means is switched to the valve closing position by the urging force of the spring member and is switched to the valve opening position by the pressurized air, and the first valve means is The first valve means is connected to the first solenoid valve via the air passage, and the first valve means is brought to the valve open position by supplying pressurized air from the first solenoid valve to the first valve means via the air passage. It is configured to be switchable .

  In this machine tool cleaning apparatus, the cleaning liquid supplied from the cleaning liquid supply means is stored and the cleaning liquid storage container capable of supplying the stored cleaning liquid to the nozzle means is provided, so that the cleaning liquid passage for sending the cleaning liquid to the nozzle means is shortened. And the passage resistance can be reduced. Moreover, it is possible to store the cleaning liquid required for the tool cleaning in advance, and it is possible to prevent the cleaning liquid from being interrupted during the cleaning. Furthermore, since the cleaning liquid pressurized by the pressurizing means is supplied to the nozzle means, the cleaning power can be increased without requiring a pump with a large capacity.

  When the cleaning liquid passage is opened by the first valve means during tool cleaning, the pressure of the pressurized air supplied to the cleaning liquid storage container can be adjusted by the second valve means. The optimum cleaning power can be set in consideration of the rate and the like. Therefore, since excessive supply of pressurized air can be prevented, the consumption of pressurized air can be reduced.

  A tool cleaning device for a machine tool according to a second aspect comprises the control means for controlling the second valve means and the tool detection means for detecting the type of the tool attached to the main shaft in the invention of the first aspect, The control means controls the second valve means based on the type of tool detected by the tool detection means.

  The tool cleaning device for a machine tool according to claim 3 is the invention according to claim 2, wherein the control means closes the air supply passage when the tool detection means detects that the tool is for rough machining. The second valve means is controlled.

  According to a fourth aspect of the present invention, there is provided a tool cleaning device for a machine tool according to the first aspect of the present invention, further comprising a control means for controlling the second valve means, wherein the control means instructs a pressure adjustment of the pressurized air. Based on the above, the second valve means is controlled.

  According to a fifth aspect of the present invention, there is provided the machine tool cleaning apparatus according to any one of the first to fourth aspects, wherein the second valve means is a proportional electromagnetic pressure control valve.

  According to the first aspect of the present invention, it is possible to obtain a tool cleaning device capable of injecting a high-pressure cleaning liquid having a supply stability and responsiveness of the cleaning liquid without changing the capacity of the pump. Since the passage resistance can be reduced by the cleaning liquid storage container, supply stability and responsiveness of the cleaning liquid can be ensured. Moreover, since the cleaning liquid in the cleaning liquid storage container is pressurized by the pressurizing means, the pressurized cleaning liquid can be sprayed onto the tool during tool cleaning. Therefore, the cleaning power can be increased without increasing the capacity of the pump.

  When the cleaning liquid passage is opened by the first valve means at the time of cleaning the tool, the pressure of the pressurized air supplied to the cleaning liquid storage container can be adjusted by the second valve means. The optimum cleaning power can be set in consideration of the material and the defect rate. By adjusting the pressure of the pressurized air in accordance with the optimum cleaning power, it is possible to prevent excessive supply of pressurized air, so that the consumption of pressurized air can be reduced.

  According to the invention of claim 2, since the control means controls the second valve means based on the type of the tool detected by the tool detection means, when performing cutting that requires high accuracy, The cleaning power can be sufficiently increased by increasing the pressure of the pressurized air. On the other hand, when performing cutting that does not require high accuracy, the pressure of pressurized air can be reduced by reducing the pressure of the pressurized air.

  According to the invention of claim 3, when the tool detecting means detects that the tool is for rough machining, the control means controls the second valve means so as to close the air supply passage, so that high accuracy is required. When roughing is not performed, the consumption of pressurized air can be significantly reduced by performing tool cleaning only with the cleaning liquid supplied from the cleaning liquid supply means.

  According to the invention of claim 4, since the control means controls the second valve means based on the command code for commanding the pressure adjustment of the pressurized air, the operator sets the command code in the machining program. By doing so, a desired detergency can be set.

  According to the invention of claim 5, since the second valve means is constituted by a proportional electromagnetic pressure control valve, the pressure of the pressurized air can be adjusted linearly, and the cleaning power can be set proportionally. it can.

It is a perspective view of the tool cleaning apparatus which concerns on Example 1 of this invention. It is a side view of a tool washing device in the state where a coolant tank was connected. It is a front view of a spindle and a spindle head. FIG. 4 is a side view of FIG. 3. FIG. 4 is a bottom view of FIG. 3. It is principal part sectional drawing of a spindle and a spindle head. It is a circuit diagram of a tool cleaning apparatus. It is a block diagram of the control system of a tool washing apparatus. It is a flowchart which shows tool washing | cleaning control. It is a circuit diagram of the tool washing | cleaning apparatus which concerns on Example 2. FIG. 10 is a flowchart illustrating tool cleaning control according to the second embodiment. FIG. 6 is a circuit diagram of a tool cleaning device according to a third embodiment.

  Hereinafter, modes for carrying out the present invention will be described.

  As shown in FIGS. 1 to 3, a machining center 1 as a machine tool includes a base portion 2 fixed to a floor surface as an installation surface and an XY axis drive mechanism (not shown) in the X axis and Y axis directions. A movable table (not shown), a control box 3 that houses a control unit 51 that numerically controls each mechanism such as a table, and a column 4 that stands on the upper surface of the rear part of the base unit 2 and extends upward. Have.

  Further, the machining center 1 includes a spindle head 5 that is mounted on the column 4 so as to be movable up and down, a spindle 6 provided on the spindle head 5, a drive mechanism 7 that can move the spindle head 5 in the Z-axis direction, The column 4 has an ATC 8 (automatic tool changer) and a storage tank 50 (cleaning liquid storage container). The storage tank 50 is disposed above the column 4.

  The coolant tank 10 is arranged so that the front end face thereof faces below a coolant discharge portion 9 provided behind the machining center 1. FIG. 1 shows a stage before the coolant tank 10 is attached to the coolant discharge portion 9. The coolant tank 10 includes a substantially box-shaped storage tank 11 having a part of the upper surface opened, and a recovery tank 12 that can be attached to and detached from the storage tank 11. The collection tank 12 removes chips mixed with the used coolant liquid flowing out from the coolant discharge unit 9. The storage tank 11 stores the coolant liquid from which chips are removed in the recovery tank 12.

The pair of first pump 13 and second pump 14 is configured to suck up coolant liquid from which chips and the like are removed from the storage tank 11 and to circulate and supply the coolant to the machining center 1.
The first pump 13 (cleaning liquid supply means) is configured to supply a coolant liquid that is injected toward a cutting portion where the tool 20 and the workpiece are in contact with each other. The discharge pressure of the first pump 13 is in the range of 0.030 to 0.045 MPa. The second pump 14 is configured to supply a coolant liquid that discharges chips and the like from the cutting portion, and the discharge pressure is set to be higher than that of the first pump 13.

  A substantially box-shaped drainage reservoir 53 that opens downward is fixed between the first pump 13 and the second pump 14 at the upper end of the storage tank 11. The exhaust passage 37 for releasing the pressure in the storage tank 50 at the end of the tool change is connected to an inlet provided in the front portion of the upper end portion of the drainage reservoir 53 via the socket 52.

  As shown in FIGS. 3 to 5, the column 4 is equipped with an ATC 8. The ATC 8 has a magazine 17 in which a plurality of pods 15 are connected to a chain-like member 16. In each pod 15, various tool holders 21 with cutting tools 20a (see FIG. 6) are selectively inserted in a detachable manner. The magazine 17 moves those pods 15 in response to the command signal, and conveys the commanded pods 15 to a predetermined replacement position. Hereinafter, the tool holder 21 to which the cutting tool 20a is attached is referred to as a tool 20.

  The ATC 8 includes a turning arm 18 that turns around an axis parallel to the main shaft 6. The swivel arm 18 grips the tool 20 attached to the main shaft 6 and the tool 20 conveyed to the replacement position, then lowers the swivel arm 18 and removes the tool 20 from the main shaft 6 and the pod 15 and then 180 degrees. Turn. Next, the swivel arm 18 is raised to attach another tool 20 to the main shaft 6 and the tool 20 removed from the main shaft 6 is returned to the pod 15 at the replacement position.

  As shown in FIG. 6, the tool 20 includes a cutting tool 20a such as a drill and a tool holder 21 for holding the cutting tool 20a. The tool holder 21 has a shank part 21a, a flange part 21b, and a V-groove part 21c. In a state where the tool 20 is attached to the main shaft 6, the shank portion 21 a of the tool holder 21 is taper-engaged with the taper engagement hole 19. The axial center position restricting surface 21d of the flange portion 21b comes into contact with the end surface 24 at the tip of the main shaft 6. Therefore, the main shaft 6 has a two-surface constraining configuration in which the position of the tool holder 21 is regulated by the taper engagement hole 19 and the end surface 24. The main shaft 6 has a holding mechanism that engages with a clamping engagement portion (not shown) of the tool holder 21 and pulls it upward.

Next, a cleaning mechanism for cleaning the tool 20 mounted in the taper engagement hole 19 of the main shaft 6 will be described.
As shown in FIG. 6, the annular spindle cap 22 is fixed to the lower end of the spindle head 5 that rotatably supports the spindle 6 with a plurality of bolts 23.

  The distal end surface of the annular nozzle forming member 26 that closes the annular passage 25 formed at the distal end portion of the main shaft cap 22 is set at substantially the same height as the end surface 24 of the main shaft 6. The annular passage 25 is connected to a coolant supply port 27, and the coolant supply port 27 is connected to a storage tank 50 via a coolant hose 28 (cleaning liquid passage).

  The nozzle forming member 26 is formed with an annular injection nozzle 29 (nozzle means) that injects the coolant liquid in an inclined direction toward the axis of the main shaft 6. The injection nozzle 29 is connected to the annular passage 25 by a plurality of passage holes 30. The annular passage 25 and the plurality of passage holes 30 supply coolant liquid to the injection nozzle 29. The injection nozzle 29 injects a tapered cylindrical injection flow A of the coolant liquid, and cleans the surface of the shank portion 21 a of the tool holder 21 that moves upward toward the taper engagement hole 19 of the main shaft 6.

Next, the cleaning liquid circuit of the tool cleaning device 67 will be described with reference to FIG.
The tool cleaning device 67 includes the above-described coolant tank 10, injection nozzle 29, first pump 13, coolant hose 28, storage tank 50, exhaust passage 37, and drainage reservoir 53. Further, the tool cleaning device 67 includes an air source 39, a first air passage 40, a second air passage 41, a third air passage 42, a branch passage 32, a plurality of switching valves 35 and 38, which will be described later. A plurality of solenoid valves 43, 44, 45 are provided.

  The first pump 13 discharges the coolant liquid sucked from the coolant tank 10 to the coolant supply passage 31 and sends it to the cutting location. A branch passage 32 branched from the coolant supply passage 31 is connected to the lower end portion of the storage tank 50.

  The branch passage 32 is provided with a filter part 33 for removing foreign matters mixed in the coolant, and a check valve 34 provided between the filter part 33 and the storage tank 50 and allowing only a flow in the direction of the storage tank 50. Is arranged.

  The coolant hose 28 or the pipe connecting the lower end of the storage tank 50 and the injection nozzle 29 has a first switching valve 35 (first valve means). The first switching valve 35 can be switched between a valve closing position for closing the passage of the coolant hose 28 and a valve opening position for allowing the coolant liquid to flow in the direction of the injection nozzle 29. The first switching valve 35 is switched to a valve closing position by an urging means (spring member), and is switched to a valve opening position by pressurized air described later.

  The storage tank 50 includes a liquid level sensor 36 at a predetermined height from the lower end. The mounting height of the liquid level sensor 36 is such that when the remaining amount of the coolant liquid is equal to or higher than the above height, the coolant liquid injection is interrupted even if the standard cleaning process is performed once, for example, for 5 seconds. It is installed in a position that does not.

  A so-called depressurizing exhaust passage 37 is provided in an intermediate region in the vertical direction of the storage tank 50 to connect the drainage reservoir 53 fixed to the coolant tank 10 and release the pressure in the storage tank 50. The exhaust passage 37 is provided with a second switching valve 38 that can be switched between a valve closing position that blocks the passage and a valve opening position that enables flow in the direction of the drainage reservoir 53. The second switching valve 38 is switched to a valve opening position by an urging means (spring member), and is switched to a valve closing position by pressurized air described later.

  In this embodiment, a factory air source 39 is used for pressurizing the coolant liquid. Since the factory air source 39 can obtain a discharge pressure (pressurized air) of about 0.5 MPa, it does not require a separate air compressor or the like for pressurizing the coolant liquid. One end of each of the first to third air passages 40, 41, and 42 is connected to the air source 39.

  The vicinity of the other end of the first air passage 40 is connected to the first electromagnetic valve 43. The first solenoid valve 43 prohibits air supply in the downstream direction of the first solenoid valve 43 and releases the pressure downstream of the first solenoid valve 43 to the atmosphere via the silencer 43a, and downstream of the first solenoid valve 43. The second position where the air supply in the direction can be electrically switched is possible.

  The first electromagnetic valve 43 is switched to the first position in the OFF state by the biasing means (spring member), and is switched to the second position by the ON operation by the control unit 51. A fourth air passage 46 capable of supplying pressurized air from the air source 39 to the first switching valve 35 is connected downstream of the first electromagnetic valve 43.

  The other end of the second air passage 41 is connected to the second electromagnetic valve 44. The second solenoid valve 44 prohibits air supply in the downstream direction of the second solenoid valve 44 and releases the pressure downstream of the second solenoid valve 44 to the atmosphere via the silencer 44a, and the downstream direction of the second solenoid valve 44. The second position where the air can be supplied can be electrically switched.

  The second electromagnetic valve 44 is switched to the first position in the OFF state by the biasing means (spring member), and is switched to the second position by the ON operation by the control unit 51. A fifth air passage 47 capable of supplying pressurized air from the air source 39 to the second switching valve 38 is connected downstream of the second electromagnetic valve 44.

  The other end of the third air passage 42 is connected to the upper end portion of the storage tank 50. The third air passage 42 includes a third electromagnetic valve 45 (second valve means) and a check valve 49 that allows only air supply in the direction of the storage tank 50. The third solenoid valve 45 prohibits the air supply in the downstream direction of the third solenoid valve 45 and also releases the pressure downstream of the third solenoid valve 45 to the atmosphere via the silencer 45a, and the third solenoid valve 45 downstream. The second position where the air supply in the direction can be electrically switched is possible. The third electromagnetic valve 45 is switched to the first position in the OFF state by the biasing means (spring member), and is switched to the second position by the ON operation by the control unit 51.

  The control unit 51 (control means) switches and controls the first electromagnetic valve 43, the second electromagnetic valve 44, and the third electromagnetic valve 45 described above between the first position and the second position. When the control unit 51 operates the first electromagnetic valve 43 to be turned on, that is, the so-called second position, the pressurized air of the air source 39 passes through the first electromagnetic valve 43 and flows into the fourth air passage 46. The pressurized air that has flowed into the fourth air passage 46 compresses the urging means of the first switching valve 35 and switches the first switching valve 35 to the valve open position. As a result, the coolant liquid stored in the storage tank 50 is injected from the injection nozzle 29.

  When the controller 51 turns on the second electromagnetic valve 44 (actuates to the so-called second position), the pressurized air from the air source 39 passes through the second electromagnetic valve 44 and flows into the fifth air passage 47. The pressurized air that has flowed into the fifth air passage 47 compresses the urging means of the second switching valve 38, switches the second switching valve 38 to the valve closing position, and closes the exhaust passage 37.

  When the control unit 51 turns on the third electromagnetic valve 45 (actuates to the so-called second position), the pressurized air flowing through the third air passage 42 passes through the third electromagnetic valve 45 and the check valve 49. Then, the coolant liquid stored in the storage tank 50 is pressurized. The pressurizing means includes an air source 39 and a third air passage 42.

  Next, the electrical configuration of the tool cleaning device 67 will be described. As shown in FIG. 8, the control unit 51 includes a control circuit 71 and various drive circuits 77 to 86. The control circuit 71 controls a machining operation of the machining center 1 and a tool cleaning control of the tool cleaning device 67 by executing a control program (see FIG. 9 described later) stored in a ROM 73 described later.

  The control circuit 71 basically comprises a microcomputer comprising a CPU 72, a ROM 73 and a RAM 74, and an input interface 75 and an output interface 76. The RAM 74 stores and holds a machining program for causing the machining center 1 to perform desired machining. The machining program includes a plurality of operation blocks, and is created by an operator via an operation panel described later.

  In the input interface 75, a keyboard 70 of an operation panel (not shown) provided on the front surface of the machining center 1, the liquid level sensor 36, and the pressure sensor 68 are electrically connected. The keyboard 70 is used for the operator to input information necessary for the machining operation. The pressure sensor 68 detects the pressure (air pressure) of the pressurized air from the air source 39.

  The output interface 76 includes a drive circuit 77 that drives the X-axis motor 87, a drive circuit 78 that drives the Y-axis motor 88, a drive circuit 79 that drives the Z-axis motor 89, and a drive circuit 80 that drives the spindle motor 90. A drive circuit 81 for driving the magazine motor 91, a drive circuit 82 for driving the first pump 13, a drive circuit 83 for driving the CRT 92 of the operation panel, and a first electromagnetic valve 43. The drive circuit 84, the drive circuit 85 for driving the second electromagnetic valve 44, and the drive circuit 86 for driving the third electromagnetic valve 45 are electrically connected to each other.

  The X-axis motor 87 includes an encoder 87a that detects the position of the table in the X-axis direction. The encoder 87a is connected to the input interface 75. The Y-axis motor 88 includes an encoder 88a that detects the position of the table in the Y-axis direction. The encoder 88a is connected to the input interface 75. The Z-axis motor 89 includes an encoder 89a that detects the position of the spindle head 5 in the Z-axis direction. The encoder 89a is connected to the input interface 75.

Next, the tool cleaning control of the tool cleaning device 67 will be described based on the flowchart of FIG. Si (i = 1, 2,...) Indicates each step.
Tool cleaning control is an interrupt process executed by the CPU 72 at a predetermined cycle. First, the CPU 72 reads various signals from the respective mechanisms such as a tool change command for the machining center 1, an operating state of the first pump 13, an operating state of the air source 39, a detected value of the liquid level sensor 36 (S1), and the processing is performed in S2. Migrate to

  The CPU 72 compares the detected value of the pressure sensor 68 with the value stored in advance in the ROM 73 to determine whether or not the air pressure of the air source 39 is normal (S2). When the air pressure is normal (Yes in S2), the CPU 72 determines whether or not the first pump 13 is driven (S3). When the CPU 72 drives the first pump 13 via the drive circuit 82, the CPU 72 stores that the first pump 13 is in a driving state in the RAM 74. Therefore, the CPU 72 refers to the RAM 74 to determine whether or not the first pump 13 is being driven.

When the first pump 13 is driven (Yes in S3), the CPU 72 refers to the detection value of the liquid level sensor 36 and determines whether or not the coolant liquid in the storage tank 50 is equal to or larger than a predetermined amount (S4). ). When there is a predetermined amount or more of the coolant in the storage tank 50 (Yes in S4), the CPU 72 determines whether or not there is a tool change command (S5).

  When controlling each mechanism in accordance with the machining program in the machining program process control, the CPU 72 determines that the tool exchange command is in the RAM 74 before executing the tool exchange command, and that the tool 20 attached to the spindle 6 by the tool exchange command. Remember the number. Therefore, the CPU 72 refers to the RAM 74 to determine whether there is a tool change command. The machining program processing control described above is executed at a predetermined cycle, and is executed by interpreting a plurality of operation blocks of the machining program for each block.

  When there is a tool change command (Yes in S5), the CPU 72 refers to the RAM 74 and determines whether or not the tool 20 to be mounted on the spindle 6 is a roughing tool (S6). Since the RAM 74 stores the type of the tool 20 (for roughing and finishing) and the tool number in association with each other, the CPU 72 refers to the RAM 74 and determines the type of the tool 20.

  When the tool 20 attached to the spindle 6 is not a rough machining tool (No in S6), the CPU 72 turns on the first electromagnetic valve 43, the second electromagnetic valve 44, and the third electromagnetic valve 45 (S7). The injection nozzle 29 injects the pressurized coolant liquid onto the tool 20 to pressurize the coolant liquid in the storage tank 50 by turning on the third electromagnetic valve 45. After turning on the first solenoid valve 43, the second solenoid valve 44, and the third solenoid valve 45, the CPU 72 permits the start of tool replacement (S8). When the CPU 72 permits the start of the tool change, the tool change is started in a tool change process (not shown). The tool change process is a program stored in the ROM 73. When the start of the tool change is permitted, the CPU 72 executes the interrupt process separately from the interrupt process described above.

  When the tool 20 to be mounted on the spindle 6 is a roughing tool (Yes in S6), the CPU 72 turns on the first solenoid valve 43 and the second solenoid valve 44 and turns off the third solenoid valve 45 ( S9). By turning off the third electromagnetic valve 45, the pressurized air does not pressurize the coolant liquid in the storage tank 50. Therefore, the injection nozzle 29 injects the coolant liquid onto the tool 20 only with the pump pressure of the first pump 13.

  Thereafter, the CPU 72 waits until the tool change is completed (S10). Whether or not the tool change has been completed is determined by whether or not the position of the spindle head 6 in the Z-axis direction has reached the tool change completion position. The position of the spindle head 6 in the Z-axis direction is detected by the encoder 89a. When the tool change is completed (Yes in S10), the CPU 72 shifts the process to S11, turns off the first electromagnetic valve 43, the second electromagnetic valve 44, and the third electromagnetic valve 45, and shifts the process to S12.

  In S12, the CPU 72 starts counting of the timer T2, and determines whether or not 5 seconds have elapsed since the counting was started (S13). In S <b> 11, the injection of the coolant liquid is stopped and the pressure in the storage tank 50 is released from the exhaust passage 37. By releasing the pressure, the coolant liquid in the coolant tank 10 is supplied to the storage tank 50 by the first pump 13. The above-mentioned 5 seconds is the time required to replenish the storage tank 50 with the coolant liquid.

  When 5 seconds have elapsed after the timer T2 count is started (Yes in S13), the CPU 72 proceeds to S14, turns on the second electromagnetic valve 44, and ends the process. In S4, when the coolant in the storage tank 50 is at a position lower than the position of the liquid level sensor 36 (No in S4), the CPU 72 determines that there is a liquid level error (S15), and the process proceeds to S11. In S2, when the CPU 72 determines that the air pressure of the air source 39 is not normal (No in S2), after the first electromagnetic valve 43, the second electromagnetic valve 44, and the third electromagnetic valve 45 are turned off (S16), End the process. In addition, the control part 51 which performs S6 corresponds to a tool detection means.

The operation and effect of the tool cleaning device 67 of the machining center 1 described above will be described.
Since the passage resistance from the storage tank 50 to the injection nozzle 29 can be reduced by the storage tank 50, the supply stability and the responsiveness of the coolant can be ensured. In addition, the storage tank 50 and the first switching valve 35 allow the storage tank 50 to be used as a pressurized air accumulator, and when the tool is cleaned, the coolant liquid urged by the pressurized air can be injected onto the tool 20. it can. As a result, the chips adhering to the tool 20 can be reliably removed. Further, by using the factory air source 39 for forming pressurized air, no additional air compressor or the like is required.

  When the cleaning fluid passage 28 is opened by the first switching valve 35 during tool cleaning, the pressure of the pressurized air supplied to the storage tank 50 by the third electromagnetic valve 45 can be adjusted. The optimum cleaning power can be set in consideration of the material and the defect rate. By adjusting the pressure of the pressurized air in accordance with the optimum cleaning power, it is possible to prevent excessive supply of pressurized air, so that the consumption of pressurized air can be reduced.

  When it is detected that the tool 20 to be mounted on the spindle 6 is a roughing tool, the third solenoid valve 45 is controlled so as to close the sixth air passage 48. By performing the tool cleaning with the cleaning liquid supplied only with the pump pressure of one pump 13, the consumption of pressurized air can be significantly reduced.

  Next, a tool cleaning device 67A according to a second embodiment of the present invention will be described with reference to FIGS. However, the same reference numerals are given to the same components as those in the above embodiment, and only different components will be described. In the second embodiment, a proportional electromagnetic pressure control valve 55 (hereinafter referred to as a pressure control valve 55) is provided in the third air passage 42 as the second valve means.

  As shown in FIG. 10, the third air passage 42 includes a pressure control valve 55 as a second valve means and a check valve 49 that allows only air supply in the direction of the storage tank 50. The pressure control valve 55 proportionally adjusts the pressure of the pressurized air supplied to the storage tank 50 so as to be an arbitrary pressure from the minimum pressure (0 MPa in this embodiment) to the maximum pressure.

  When the pressure of the pressurized air supplied to the storage tank 50 is set to 0 MPa, the control unit 51 closes the pressure control valve 55 and closes the third air passage 42, so that the pressurized air is the coolant in the storage tank 50. Do not pressurize the liquid. On the other hand, when the pressure of the pressurized air supplied to the storage tank 50 is set to an arbitrary pressure other than 0, the control unit 51 pressurizes the pressure control valve 55 based on the set value of the pressure of the pressurized air. Control air flow. Therefore, the pressurized air flowing through the third air passage 42 passes through the pressure control valve 55 and the check valve 49 by the flow rate of the pressurized air based on the set value, and the coolant liquid stored in the storage tank 50 is removed. Pressurize at the set pressure.

  Next, the tool cleaning control of the tool cleaning device 67 will be described based on the flowchart of FIG. Si (i = 21, 22...) Indicates each step. Since S21 to S25, S27, S28, and S30 to S33 are the same processes as S1 to S5, S8, S10, and S12 to S15 of the first embodiment, description thereof is omitted.

  The CPU 72 determines whether or not there is a tool change command (S25). If there is a tool change command (Yes in S25), the CPU 72 turns on the first solenoid valve 43 and the second solenoid valve 44, and The pressure control valve 55 is controlled based on the tool number with reference to the RAM 74 (S26). The RAM 74 stores in advance a set value of the pressure of pressurized air in association with the tool number. For example, the set value of the rough machining tool is 0 MPa. Therefore, the CPU 72 controls the pressure control valve 55 based on the type of the tool 20 attached to the main shaft 6.

  When the tool change is completed (Yes in S28), the CPU 72 proceeds to S29, turns off the first electromagnetic valve 43 and the second electromagnetic valve 44, closes the pressure control valve 55, and closes the third air passage. After closing 42 (S29), the process proceeds to S30. In S22, when the CPU 72 determines that the air pressure of the air source 39 is not normal (No in S22), the CPU 72 turns off the first electromagnetic valve 43 and the second electromagnetic valve 44, and closes the pressure control valve 55. After closing the third air passage 42 (S34), the process is terminated. In addition, the control part 51 which performs S26 is equivalent to a tool detection means.

  Thus, since the control part 51 controls the 2nd valve means based on the kind of tool, when performing the cutting which requires high precision, the pressure of pressurized air is raised and cleaning power is improved. It can be raised sufficiently. On the other hand, when performing cutting that does not require high accuracy, the pressure of pressurized air can be reduced by reducing the pressure of the pressurized air. Since the second valve means is constituted by the pressure control valve 55, the pressure of the pressurized air can be adjusted linearly, and the cleaning power can be set proportionally.

Next, a tool cleaning device 67B of Example 3 of the present invention will be described with reference to FIG. However, the same reference numerals are given to the same components as those in the above embodiment, and only different components will be described.
In the third embodiment, a third switching valve 58 is provided in the third air passage 42 as the second valve means.

  As shown in FIG. 12, the vicinity of the other end of the first air passage 40 is connected to the first electromagnetic valve 43 and the fourth electromagnetic valve 56. The fourth solenoid valve 56 prohibits air supply in the downstream direction of the fourth solenoid valve 56 and releases the pressure downstream of the fourth solenoid valve 56 to the atmosphere via the silencer 56a, and downstream of the fourth solenoid valve 56. The second position where the air supply in the direction can be electrically switched is possible.

The fourth solenoid valve 56 is switched to the first position in the OFF state by the biasing means (spring member), and is switched to the second position by the ON operation by the control unit 51. A sixth air passage 57 capable of supplying pressurized air from the air source 39 to the third switching valve 58 is connected downstream of the fourth electromagnetic valve 56.
The third air passage 42 includes a third switching valve 58 as a second valve means and a check valve 49 that allows only air supply in the direction of the storage tank 50. The third switching valve 58 is switched to a valve closing position by an urging means (spring member), and is switched to a valve opening position by pressurized air described later.

  The control unit 51 switches and controls the fourth electromagnetic valve 56 between the first position and the second position. When the control unit 51 operates the fourth electromagnetic valve 56 to be turned on, that is, the so-called second position, the pressurized air of the air source 39 passes through the fourth electromagnetic valve 56 and flows into the sixth air passage 57. The pressurized air that has flowed into the sixth air passage 57 compresses the urging means of the third switching valve 58 and switches the third switching valve 58 to the valve open position. Thereby, the pressurized air flowing through the third air passage 42 pressurizes the coolant liquid that passes through the third switching valve 58 and the check valve 49 and is stored in the storage tank 50.

  When the control unit 51 operates the fourth electromagnetic valve 56 to turn off, that is, the so-called first position, the pressurized air from the air source 39 does not flow into the sixth air passage 57. Therefore, the third switching valve 58 is switched to the closed position, and the pressurized air flowing through the third air passage 42 does not pressurize the coolant liquid stored in the storage tank 50. The tool cleaning control of the third embodiment is obtained by changing the third electromagnetic valve 45 to the fourth electromagnetic valve 56 in S7, S9, S11, and S16 of the tool cleaning control of the first embodiment shown in FIG. In this case, the same effects as those of the first embodiment are obtained.

Next, a modified example in which the above embodiment is partially modified will be described.
1] In the above embodiment, the pressure adjustment M code (command code) for pressurized air is set in the machining program, and the control unit 51 controls the second valve means based on the pressure adjustment M code. May be. Note that the tool cleaning control of this modified example can be realized by changing S6 to determining whether or not there is an M code for pressure adjustment in the tool cleaning control of the first embodiment shown in FIG. In the machining program processing control, the CPU 72 refers to the RAM 74 to determine that the pressure adjustment command is stored in the RAM 74 when the M code for pressure adjustment is read.

  Further, in the tool cleaning control of the second embodiment shown in FIG. 11, the location related to the pressure control valve 55 in S <b> 26 may be changed to control the pressure control valve 55 based on the set value associated with the pressure adjustment M code. realizable. The RAM 74 stores in advance a set value of the pressure of pressurized air in association with the pressure adjustment M code. Therefore, the CPU 72 refers to the RAM 74 and controls the pressure control valve 55 based on the set value corresponding to the read M code for pressure adjustment. In these cases, the operator can set a desired cleaning power by setting the pressure adjusting M code in the machining program.

  2] In the above embodiment, a manufacturer or an operator may set a preset value of the pressure of pressurized air in the RAM 74 in advance, and control the second valve means based on the preset value.

1 Machining Center 6 Spindle 10 Coolant Tank 13 First Pump 20 Tool 28 Coolant Hose 29 Injection Nozzle 35 First Switching Valve 37 Exhaust Passage 39 Air Source 42 Third Air Passage 45 Third Electromagnetic Valve 50 Storage Tank 51 Control Unit 55 Proportional Electromagnetic Type Pressure control valve 58 Third switching valve 67, 67A, 67B Tool cleaning device

Claims (5)

A tank for storing a cleaning liquid for cleaning a tool mounted on the spindle, nozzle means capable of spraying the cleaning liquid stored in the tank to the tool, and a cleaning liquid supply means capable of supplying the cleaning liquid from the tank to the nozzle means. In a tool cleaning device for a machine tool having
A cleaning liquid storage container disposed between the tank and the nozzle means, storing the cleaning liquid supplied from the cleaning liquid supply means, and capable of supplying the stored cleaning liquid to the nozzle means;
A cleaning liquid passage connecting the nozzle means and the cleaning liquid storage container, and a first valve means capable of opening and closing the cleaning liquid passage;
Pressurizing means for pressurizing the cleaning liquid stored in the cleaning liquid storage container, an air supply means for generating pressurized air, and an air supply passage for supplying pressurized air from the air supply means to the cleaning liquid storage container Pressurizing means comprising:
A second valve means provided in the air supply passage so that the pressure of the pressurized air supplied to the cleaning liquid storage container can be adjusted when the cleaning liquid passage is opened by the first valve means ;
The first valve means is switched to a valve closing position by an urging force of a spring member, and is switched to a valve opening position by pressurized air, and the first valve means is connected to the first electromagnetic valve via an air passage. The machine is characterized in that the first valve means can be switched to the valve open position by supplying pressurized air from the first electromagnetic valve to the first valve means via the air passage. Machine tool cleaning equipment. Control means for controlling the second valve means;
Tool detecting means for detecting the type of tool to be mounted on the spindle,
2. The tool cleaning device for a machine tool according to claim 1, wherein the control means controls the second valve means based on the type of tool detected by the tool detection means.   The control unit controls the second valve unit to close the air supply passage when the tool detection unit detects that the tool is a rough machining tool. Tool cleaning equipment for machine tools. Control means for controlling the second valve means;
2. The tool cleaning device for a machine tool according to claim 1, wherein the control means controls the second valve means based on a command code for instructing pressure adjustment of the pressurized air.   The tool cleaning device for a machine tool according to any one of claims 1 to 4, wherein the second valve means is constituted by a proportional electromagnetic pressure control valve.