JP2012245595A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine tool that prevents increase in cost with respect to increase in electric load mounted thereon.SOLUTION: A control part 20 of this machining center continuously actuates first electric loads such as a fan 16, an interior light 17, and a back light 18. When second electric loads, such as a greasing pump 50, a door open/close motor 51, or a breakage detection motor 52 are actuated, the control part 20 calculates a total amount of operational power of the second electric loads to be actuated, and an operational power amount of the first electric loads in operation at the time, and then determines whether or not the total power amount exceeds a predetermined power amount. If the total power amount exceeds the predetermined power amount, the control part 20 selects the first electric loads which temporarily stop operation, actuates the second electric loads after the stop of the selected first electric loads, and restarts the first electric loads that has been stopped, after the operation of the second electric loads.

Description

  The present invention relates to a machine tool that performs various machining on a workpiece by rotationally driving a tool mounted on a machining shaft.

  Generally, a machining center (machine tool) performs various processes such as milling, boring or tapping. The machining center includes a storage unit for storing a plurality of types of tools, and a mechanism for exchanging the tool mounted on the processing shaft with the tool stored in the storage unit. Various processes are continuously performed while changing the tool.

  The machining center performs various operations such as rotational driving of the machining axis, movement of the machining axis or workpiece in the X-axis direction, Y-axis direction or Z-axis direction, and replacement of the tool mounted on the machining axis. A circuit board on which a control circuit for controlling this operation is mounted is provided. Such a circuit board is accommodated in a housing provided on the back side of the machining center, for example, and the machining center includes a cooling fan in order to suppress a temperature rise in the housing due to the operation of the circuit. Yes.

  For example, in Patent Document 1, the control state of the spindle is monitored, and when the first control state is accompanied by a temperature rise inside the control panel, the operation of the cooling fan is started and accompanied by a temperature rise inside the control board. There has been proposed a control panel cooling system capable of starting the cooling of the control panel regardless of the location where the temperature has increased by stopping the operation of the cooling fan when the second control state is reached.

  The machining center includes a box-shaped cover that covers the main body of the machine, and an interior lamp for an operator is provided in the cover. Further, an operation panel for an operator to operate the machining center is provided outside the cover, and a backlight for liquid crystal display is built in the operation panel. The electric loads such as the fan, the interior lamp, and the backlight provided in the machining center are continuously operated.

  On the other hand, the machining center includes various mechanical mechanisms for rotating the machining axis, moving the machining axis or workpiece, changing tools, and the like. In order to smoothly operate these mechanical mechanisms, it is necessary to periodically lubricate or lubricate the mechanical mechanisms, such as ball screws. Some machining centers have a function of automatically refueling or greasing a mechanical mechanism with a frequency of about once every few hours.

JP 2003-245842 A

  In order to automatically supply oil or grease to the mechanical mechanism, it is necessary to operate a pump for conveying oil or oil. The machining center is supplied with electric power from an external commercial AC power source or the like, and a number of electrical loads such as an internal motor and a fan are operated by this electric power. When the above-described oil supply or greasing pump is mounted on a machining center and operated, electric power for operating the pump is required.

  The machining center is provided with a fuse or a breaker in the power supply path for overcurrent protection. A machining center equipped with a pump for lubrication or lubrication must have a larger capacity (breaking current amount) such as a fuse or a breaker than a machining center not equipped with this. Further, depending on the type of electrical load mounted on the machining center, an AC / DC converter or a transformer may be arranged in the power supply path. When a machining center is equipped with a pump for lubrication or lubrication and connected to an AC / DC converter or transformer, the capacity of the AC / DC converter or transformer, etc. Output power) must be large. Accordingly, there is a problem that the automatic loading of the lubrication or greasing function to the mechanical mechanism causes an excessive increase in the cost of the machining center.

  When the function of automatically opening and closing the door of the cover that covers the machining center is installed, it is necessary to supply electric power to a motor or the like for opening and closing the door. In addition, when a function for detecting breakage of a tool is installed, it is necessary to operate by supplying power to a motor that rotates a touch sensor that detects contact / non-contact with the tool. As described above, in order to increase the functionality of a machining center, when various electrical loads that operate intermittently are mounted, the capacity of a fuse or breaker, or an AC / DC converter or transformer is increased. There is a problem that it is necessary and causes an increase in cost.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a machine tool capable of suppressing an increase in cost with respect to an increase in an electric load to be mounted. .

  The machine tool according to the present invention is a machine tool that drives a mounted tool to process a workpiece, is supplied with electric power from the same power source, and has a plurality of first electric loads that operate continuously, and When operating a plurality of second electrical loads that operate intermittently and at least one second electrical load, the operating electric energy of the second electrical load to be operated and the first electricity in operation Calculating means for calculating the total amount of operating power of the dynamic load, and when the total amount of operating power calculated by the calculating means exceeds the predetermined power amount, the total amount of operating power exceeds the predetermined power amount Selection means for selecting one or more first electrical loads that temporarily cease operation from the plurality of first electrical loads that are in operation, and the first electricity selected by the selection means Stop the operation of the mechanical load and operate the second electrical load. After operation of the electrical load of said second ends, characterized in that it comprises a resuming control means the first operation of the electrical load.

  The machine tool according to the present invention is characterized in that the plurality of first electric loads are at least two of a fan, an electric lamp, and an operation panel backlight for cooling the inside.

  Further, in the machine tool according to the present invention, the plurality of first electrical loads include a backlight of the operation panel, and the control unit is configured to operate the operation panel for a predetermined time, or The operation of the backlight is stopped when an operation for permitting the stop of the backlight is accepted by the operation panel.

  In the machine tool according to the present invention, the plurality of second electric loads may be configured to open and close a door provided on a cover that covers a mechanism covering a mechanism and a pump that supplies or lubricates the mechanism related to the processing. Including at least two of a door opening / closing motor and a contact detection member that detects breakage of the tool in response to contact / non-contact with the tool, the breakage detection motor rotating toward the tool. .

  The machine tool according to the present invention is characterized in that the control means selectively operates the pump, the door opening / closing motor and the breakage detection motor.

In the present invention, the machine tool continuously operates the plurality of first electrical loads, and operates the second electrical load intermittently or irregularly as necessary. When operating the second electric load, the total electric energy of the operating electric energy of the second electric load to be operated and the operating electric energy of the first electric load currently operating is calculated. Then, it is determined whether or not the total power amount exceeds a predetermined power amount. The predetermined power amount is determined in advance based on, for example, the capacity of a fuse or a breaker or the like, or the power supply amount of a power source (a circuit such as an AC / DC converter or a transformer related to power supply). When the total electric energy does not exceed the predetermined electric energy, the operation of the second electric load can be performed.
When the total power amount exceeds a predetermined power amount, the first electrical load that temporarily stops the operation is selected, the second electrical load is operated after the operation of the selected first electrical load is stopped, The operation of the first electric load that has been stopped after the operation of the second electric load is resumed. By appropriately selecting the first electrical load that temporarily stops the operation so that the total power amount does not exceed the predetermined power amount, it is possible to increase the capacity of a fuse or a breaker or the like, or It is possible to operate the second electrical load intermittently or irregularly without increasing it, and the cost increase of the machine tool can be suppressed.

  In the present invention, the first electric load that operates continuously and temporarily stops the operation includes a fan for cooling the inside, and an electric lamp that illuminates the interior of the machine for the user to perform work. And at least two of backlights for liquid crystal display of the operation panel. These first electrical loads should normally operate continuously, but since the influence on the operation of machining the workpiece by the machine tool is small, the operation is temporarily stopped for a short period of time. It is possible.

  However, it is not preferable to stop the operation panel backlight while the operator is operating the operation panel. For this reason, in the present invention, the operation of the backlight is temporarily stopped when the operation panel is not operated for a predetermined period of time or when the operation panel accepts the backlight stop permission. Thereby, the backlight is not suddenly stopped during the operation of the operator.

In the present invention, the second electrical load includes at least two of an oil supply or greasing pump, a door opening / closing motor, and a breakage detection motor.
When a pump that supplies or lubricates a machine mechanism as an electrical load is mounted on a machine tool, the lubrication or lubrication may be performed at a frequency of about once every several hours, and the operation time of the pump is also several seconds to several tens. It may be about seconds.
The machine tool is provided with a cover that covers the machine body in order to ensure the safety of the operator. The cover is provided with a door for exchanging workpieces or performing maintenance of the apparatus main body. The door can be an automatic door by driving the door with a motor. This door is performed at a limited time such as before and after the start of machining of the workpiece, and the operation time of the motor accompanying opening and closing of the door may be several seconds to several tens of seconds.
Some machine tools have a function of detecting breakage of a tool when changing a tool. The breakage of the tool can be detected according to whether or not the linear touch sensor is rotated in the vicinity of the tool and the touch sensor contacts the tool. Although tool breakage detection is performed at the time of tool change, the operation time of the motor that rotates the touch sensor is about several seconds.
Since the operation time of these second electrical loads performed intermittently or irregularly is short, even when the first electrical load is temporarily stopped, the influence is minimized. You can stay.

  In the present invention, the pump, the door opening / closing motor, and the breakage detection motor are operated alternatively (or exclusively) (that is, not operated simultaneously). Thereby, the number of the 1st electric load which stops operation | movement temporarily can be reduced.

  According to the present invention, when the second electric load is operated intermittently or irregularly, if the total electric power exceeds a predetermined electric energy, the first electric load is selected and temporarily Therefore, the increase in power consumption as a machine tool can be suppressed, and the increase in capacity of a fuse or breaker, or an AC / DC converter or transformer can be suppressed. The increase in cost can be suppressed.

It is a perspective view which shows the external appearance of a machining center. It is a front view which shows the structure of the principal part which concerns on the process of a machining center. It is a block diagram which shows the electrical structure of a machining center. It is a table which shows an example of the electric energy of each electric load memorize | stored in ROM. It is a schematic diagram for demonstrating operation | movement switching of the electrical load of a machining center. It is a flowchart which shows the procedure of the operation | movement switching process of the electrical load of a machining center. It is a flowchart which shows the procedure of the operation | movement switching process of the electrical load of a machining center. It is a flowchart which shows the procedure of the operation | movement switching process of the electrical load of a machining center. It is a flowchart which shows the procedure of the operation | movement switching process of the electrical load of a machining center. It is a flowchart which shows the procedure of a backlight stop preparation process.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. FIG. 1 is a perspective view showing an appearance of a machining center (machine tool). FIG. 2 is a front view showing a configuration of a main part related to machining of the machining center. The machining center according to the present embodiment can perform desired machining (for example, slicing, drilling, cutting, etc.) on a workpiece by relatively moving a workpiece (not shown) to be processed and a tool. It is a machine tool that can. The machining center includes a metal base 1, and legs are provided at the four corners of the lower part of the base 1, and these four legs are installed on the floor or the like, so that the machining center is installed at a predetermined place. The The base 1 is a rectangular parallelepiped casting that is long in the front-rear direction of the machining center.

  A column seat 3 is provided on the rear portion of the base 1 of the machining center, and a columnar column 4 extending vertically upward is erected on the column seat 3. The column 4 is provided with a spindle head 5 that can move up and down along the front surface thereof. The spindle head 5 is provided with a spindle 5A on which a machining tool 6 is mounted, and a tool exchange mechanism 7 for exchanging the tool 6 mounted on the spindle 5A with another tool 6. Although not shown in FIG. 1, a Z-axis motor (not shown) is provided above the column 4, and the spindle head 5 can be moved up and down by the rotation of the Z-axis motor.

  A spindle 5A corresponding to a machining axis is rotatably mounted on the spindle head 5, and a spindle motor (not shown) for rotationally driving the spindle 5A is provided at the top. A tool 6 is detachably attached to the lower end of the main shaft 5A. When the main shaft 5A is rotationally driven by a main shaft motor, the tool 6 rotates and a workpiece fixed to the table 8 is processed. The spindle 5A moves between an upper exchange position and a lower machining position by the vertical movement of the spindle head 5. The tool change mechanism 7 holds and conveys a tool magazine 14 that stores a plurality of tool holders that support the tool 6, a tool holder that is mounted on the spindle 5A, and another tool holder that is stored in the tool magazine 14, And a tool changing arm 15 for changing the tool.

  Further, on the base 1, a table 8 is disposed below the spindle head 5 so that a work can be detachably fixed. The table 8 is controlled to move in the X-axis direction (left-right direction) and the Y-axis direction (front-rear direction) by an X-axis motor and a Y-axis motor (not shown) that are servomotors. Specifically, a rectangular parallelepiped support base 10 is provided below the table 8, and the support base 10 is provided with a pair of X-axis feed guides extending along the X-axis direction, and a pair of X-axis feed guides. A table 8 is movably supported on the top. In addition, a pair of Y-axis feed guides extending in the longitudinal direction (Y-axis direction) is provided on the upper portion of the base 1, and the support base 10 is movably supported on the pair of Y-axis feed guides. . A Y-axis motor provided on the base 1 moves and drives the support base 10 in the Y-axis direction along the Y-axis feed guide, and an X-axis motor provided on the support base 10 moves along the X-axis feed guide along the X-axis. The table 8 is driven to move in the axial direction.

  The X-axis feed guide is provided with telescopic covers 11 and 12 that contract telescopically on both the left and right sides of the table 8. In the Y-axis feed guide, a telescopic cover 13 and a Y-axis rear cover are provided on the front and rear sides of the support base 10, respectively. The X-axis feed guide and the Y-axis feed guide are always covered by the telescopic covers 11, 12, 13 and the Y-axis rear cover, regardless of which direction the table 8 and the support base 10 are moved. The telescopic covers 11, 12, 13 and the Y-axis rear cover are for preventing chips or the like scattered from the workpiece processing region from dropping onto the X-axis feed guide, the Y-axis feed guide, and the like.

  A box-shaped control box 9 is provided on the back side of the column 4, and a control unit 20 (see FIG. 3) for controlling the operation of the machining center is accommodated in the control box 9. Also, fans 16 are provided on both sides and the back of the control box 9 to cool various electrical devices housed in the control box 9 by ventilating the inside and outside of the control box 9 (however, FIG. In FIG. 1, only one fan 16 is shown).

  FIG. 3 is a block diagram showing an electrical configuration of the machining center. In FIG. 3, the power supply path is indicated by a thick solid line. In the machining center, a plurality of servo amplifiers 30 and a switching unit 43 are connected to the control unit 20 accommodated in the control box 9 via a communication line, and the control unit 20 is connected to the servo amplifier 30 and the switching unit 43 and the like. Control processing related to work is performed while inputting / outputting (transmitting / receiving) various kinds of information.

  The control unit 20 includes a CPU (Central Processing Unit) 21, a ROM (Read Only Memory) 22, a RAM (Random Access Memory) 23, an input / output unit 24, an operation panel 25, and the like. The CPU 21 performs various arithmetic processes by reading and executing a control program stored in advance in the ROM 22. The CPU 21 performs arithmetic processing based on information input from the servo amplifier 30 and the switching unit 43 and outputs the calculation result to the servo amplifier 30 and the switching unit 43, thereby controlling the operation of each part of the machining center. Performs machining on the workpiece.

  The ROM 22 is configured by a nonvolatile storage element such as an EEPROM (Electrically Erasable Programmable ROM) or a flash memory, and stores a control program executed by the CPU 21 and information necessary for various processes. In the machining center according to the present embodiment, information related to the amount of power consumed when each electrical load is operated is stored in the ROM 22 in advance for a plurality of electrical loads installed in the machine.

  The RAM 23 is composed of a storage element such as SRAM (Static RAM) or DRAM (Dynamic RAM), and information generated during the arithmetic processing of the CPU 21 and information exchanged between the servo amplifier 30 and the switching unit 43 and the like. Etc. are temporarily stored. The input / output unit 24 is connected to the servo amplifier 30 and the switching unit 43 through a communication line and the like, and inputs / outputs information between them. The input / output unit 24 outputs information given from the CPU 21 to a predetermined output destination, and gives information inputted from the servo amplifier 30 or the switching unit 43 to the CPU 21. The operation panel 25 is for accepting an operation of the machining center by an operator, and has a plurality of switches for accepting the operation and a liquid crystal display unit for displaying messages, menus, and the like. The operation panel 25 notifies the CPU 21 of the accepted operation content.

  The servo amplifier 30 includes a spindle motor that rotates the spindle 5A, an X-axis motor and a Y-axis motor that move the table 8 in the X-axis direction and the Y-axis direction, and a Z-axis motor that moves the spindle head 5 in the Z-axis direction. Each of these motors is driven. The servo amplifier 30 drives the motor in accordance with an instruction given from the control unit 20, detects information such as the amount of rotation of the motor, and provides it to the control unit 20.

  The machining center operates with electric power supplied from an external AC power supply 100. The AC power supply 100 is, for example, a single-phase 200V commercial AC power supply, and power is supplied from the AC power supply 100 to the machining center by connecting a plug and a power cable of the machining center. In the machining center, electric power from the AC power supply 100 is supplied via the fuse 41, the AC / DC converter 42, and the switching unit 43 to the fan 16, the interior lamp 17, the backlight 18, the greasing pump 50, the door opening / closing motor 51, and the like. It is supplied to an electrical load such as a breakage detection motor 52.

  The fuse 41 is a circuit element for preventing the occurrence of heating or firing at the time of abnormality by cutting off the power supply path when a predetermined current (rated current) flows. The AC / DC converter 42 converts AC power (for example, single-phase 200 V) supplied from the AC power supply 100 into DC power (for example, 24 V) and outputs the DC power to the switching unit 43.

  The switching unit 43 is connected to electrical loads such as the fan 16, the interior lamp 17, the backlight 18, the greasing pump 50, the door opening / closing motor 51, the breakage detection motor 52, and the like. Control to switch non-supply individually. The switching unit 43 has switches respectively arranged in the power supply path from the AC / DC converter 42 to each electrical load, and the power to each electrical load is switched by individually switching the opening and closing of these switches. Switching between supply and non-supply individually. Each electrical load operates when DC power is supplied from the switching unit 43.

  The machining center includes a box-shaped splash cover (not shown) that covers the upper portion of the base 1. Since light from the outside is blocked to some extent in the splash cover, an interior lamp 17 is provided in the splash cover, and the visibility of the operator is improved by illuminating the inside of the splash cover. The operation panel 25 of the machining center is provided with a liquid crystal display unit, and the backlight 18 is used for display on the liquid crystal display unit. The fan 16, the interior lamp 17 and the backlight 18 are electrical loads (first electrical load) that operate continuously during the operation of the machining center.

  The greasing pump 50 is a pump for greasing the mechanical mechanism of the machining center. For example, the machining center includes a mechanical mechanism that moves the spindle head 5 in the Z-axis direction. A guide rail is fixed to the column 4 of the machining center in the vertical direction, and the spindle head 5 is attached so as to be movable in the Z-axis direction along the guide rail via a plurality of sliding pieces provided on the spindle head 5. A nut member provided on the spindle head 5 is threadedly inserted into a ball screw arranged in parallel with the guide rail. The machining center rotationally drives the ball screw in the forward and reverse directions by the Z-axis motor, and the spindle head 5 moves in the Z-axis direction along the guide rail by the ball screw and the nut member. The machining center lubricates the ball screw and the like by operating the greasing pump 50. The mechanical mechanism that the greasing pump 50 lubricates is not limited to the mechanical mechanism that moves the spindle head 5 in the Z-axis direction.

  A sliding door is provided in front of the splash cover provided in the machining center. The machining center can automatically open and close the door by driving the door opening and closing motor 51 in response to an operation on the door opening and closing switch. The operation time of the door opening / closing motor 51 with one opening or closing of the door is about several seconds. The door opening / closing motor 51 operates by supplying DC power from the switching unit 43.

  In the machining center, a number of tools are accommodated in the tool magazine 14, and when machining of a workpiece by one tool is completed, the tool change mechanism 7 accommodates the tool in the tool magazine 14 with one tool mounted on the spindle 5A. Replace other tools and process the workpiece with the replaced tools. When changing the tool, the machining center detects breakage of the used tool. The rotating shaft of the breakage detection motor 52 is provided with a thin rod-shaped touch sensor in a direction substantially orthogonal to the axial direction of the rotation shaft, and the machining center places the breakage detection motor 52 near the used tool. Turn the touch sensor one turn. At this time, if the touch sensor touches the tool, the tool is not broken. If the touch sensor does not touch the tool, it can be determined that the tool is broken. Breakage detection is performed. The operation time of the breakage detection motor 52 when performing tool breakage detection is about several seconds.

  The greasing pump 50, the door opening / closing motor 51, and the breakage detection motor 52 of the machining center are electrical loads (second electrical loads) that operate intermittently or irregularly with respect to the operation of the machining center.

  When the power is turned on by an operation of a power switch (not shown) or the like and the operation is started, the control unit 20 of the machining center starts the operation of the fan 16, the interior lamp 17 and the backlight 18 by giving an instruction to the switching unit 43. . At this time, the controller 20 does not operate the grease pump 50, the door opening / closing motor 51, and the breakage detection motor 52. Thereafter, the control unit 20 starts machining the workpiece by giving an operation instruction to the servo amplifier 30 or the like according to the operation of the operation panel 25 by the operator.

  The control unit 20 includes a timer for measuring the time when the workpiece is processed, and information on the time measured by the timer is stored in a nonvolatile storage area (for example, the ROM 22). When the time measured by the timer reaches a predetermined time (for example, 5 hours), the control unit 20 lubricates the mechanical mechanism. At this time, the control unit 20 needs to operate the greasing pump 50 for a predetermined time (for example, 10 seconds) by giving an instruction to the switching unit 43.

  Further, when an operation of a door opening / closing switch (not shown) or the like is performed, the control unit 20 needs to drive the door opening / closing motor 51 to perform the door opening / closing operation by giving an instruction to the switching unit 43. The time for driving the door opening / closing motor 51 is about several seconds. The control unit 20 needs to rotationally drive the breakage detection motor 52 by giving an instruction to the switching unit 43 when exchanging the tool mounted on the spindle 5A. Breakage detection is performed each time the tool is changed, and the time for driving the breakage detection motor 52 in one tool change is about several seconds.

  The control unit 20 normally operates the first electrical load such as the fan 16, the interior lamp 17 and the backlight 18 continuously. However, when a predetermined condition is satisfied, the grease supply pump 50 and the door When it becomes necessary to operate the second electrical load such as the opening / closing motor 51 or the breakage detection motor 52, the second electrical load is operated intermittently or irregularly. However, before operating the second electrical load, the control unit 20 operates with the operating power amount of the first electrical load that is operating at that time and the operating power of the second electrical load that needs to be operated. The total amount of power is calculated, and the calculated total power amount is compared with a predetermined power amount (determined by the allowable power amount of the fuse 41 or the output power amount of the AC / DC converter 42).

  When the calculated total power amount does not exceed the predetermined amount, the control unit 20 can operate the desired second electrical load by giving an instruction to the switching unit 43. On the other hand, when the calculated total power amount exceeds the predetermined amount, the desired second electrical load cannot be operated, and therefore the control unit 20 selects one of the first electrical loads. The operation is temporarily stopped, and then the second electrical load is operated. The ROM 22 stores the operating power amount of each electrical load in advance, and the control unit 20 performs processing such as calculation of the total power amount and selection of the first electrical load to stop the operation based on this information. Yes.

  FIG. 4 is a table showing an example of the electric energy of each electrical load stored in the ROM 22. The ROM 22 of the control unit 20 stores the amount of power consumed during operation (operating power) in association with each of the first electrical load and the second electrical load. For example, it is stored that the operating electric energy of the fan 16 as the first electric load is 30 W, the operating electric energy of the interior lamp 17 is 45 W, and the operating electric energy of the backlight 18 is 19 W. In addition, the operating power amount of the grease supply pump 50 as the second electrical load is 30 W, the operating power amount of the door opening / closing motor 51 is 46 W, and the operating power amount of the breakage detection motor 52 is 40 W. These operating power amounts may be measured in advance at the design stage of the machining center, or may be catalog specifications for each load. However, the operating power amount of each load stored in the ROM 22 is preferably a worst value.

  FIG. 5 is a schematic diagram for explaining the operation switching of the electrical load of the machining center, and shows an example of the operation switching based on the operation power amount of the table shown in FIG. 4 as a timing chart. In this example, the first electric load is only three of the fan 16, the interior lamp 17 and the backlight 18, and the second electric load is the greasing pump 50, the door opening / closing motor 51 and the breakage detection. It is assumed that there are only three motors 52, and the power amount (predetermined amount) allowed as the total operating power amount is 100W. In this figure, the intervals from t0 to t5 are all the same, but the intervals from t1 to t2, t3 to t4, and t5 are actually shorter than other intervals such as t0 to t1.

  First, at time t0, the machining center is activated, and the control unit 20 starts operations of the fan 16, the interior lamp 17, and the backlight 18. The total operating power at this time is 30W + 45W + 19W = 94W. Next, when the timing for operating the grease pump 50 at time t1 is reached, the controller 20 has the operating power amount of the grease pump 50 of 30 W. The operation is stopped and the greasing pump 50 is operated. At this time, the operation of the interior lamp 17 can be stopped and the greasing pump 50 can be operated. However, the controller 20 stops the operation in the order of the fan 16, the interior lamp 17, and the backlight 18. The electrical load shall be selected (but not limited to this order). The total operating power at this time is 45W + 19W + 30W = 94W.

  After the operation of the greasing pump 50 is completed, the control unit 20 resumes the operation of the fan 16 at time t2. Next, when the door opening / closing motor 51 is operated at time t3, since the operating electric energy of the door opening / closing motor 51 is 46 W, the control unit 20 stops the operation of the fan 16 and the interior lamp 17 and causes the door opening / closing motor 51 to operate. Make it work. The total operating power at this time is 19W + 46W = 65W. After the operation of the door opening / closing motor 51 is completed, the control unit 20 resumes the operations of the fan 16 and the interior lamp 17 at time t4. Next, when operating the breakage detection motor 52 at time t5, since the operating power amount of the breakage detection motor 52 is 40 W, the control unit 20 stops the operation of the interior lamp 17 and causes the breakage detection motor 52 to operate. Make it work. The total operating power at this time is 30W + 19W + 40W = 89W. After the operation of the breakage detection motor 52 is completed, the control unit 20 resumes the operation of the interior lamp 17.

  As described above, when the second electric load is operated, when the total electric power exceeds a predetermined amount, the control unit 20 stops the operation from the first electric load that is operating at that time. Alternatively, a plurality of first electrical loads are selected, and the desired second electrical load is operated after the operation of the selected first electrical load is stopped. The control unit 20 selects the first electrical load whose operation is stopped so that the total operating power amount does not exceed a predetermined amount even when the desired second electrical load is operated. For example, the control unit 20 has one or more first electric loads so that the operating electric energy of the first electric load to be stopped is larger than the operating electric energy of the desired second electric load to be operated. An electrical load may be selected.

  Note that the control unit 20 does not simultaneously operate (alternatively operate) the plurality of second electrical loads. If the timings at which the plurality of second electrical loads are operated overlap, the control unit 20 operates the second electrical loads in a predetermined order. For example, the control unit 20 performs the operation of the second electrical load in the order of the breakage detection motor 52, the door opening / closing motor 51, and the greasing pump 50 (however, this order is an example, and the present invention is not limited to this). Absent).

  6 to 9 are flowcharts showing the procedure of the operation switching process of the electrical load of the machining center. When the machining center is turned on, first, the control unit 20 gives an instruction to the switching unit 43 to start operations of the fan 16, the interior lamp 17 and the backlight 18 (step S1). Next, the control unit 20 detects the breakage by reaching the timing for supplying the grease based on the timing of the timer, performing an operation on the door opening / closing switch or the like, or exchanging the tool in the process of processing the workpiece. It is determined whether it is necessary to perform lubrication, door opening / closing, or breakage detection by examining whether the timing has been reached (step S2).

  When it is determined that it is not necessary to perform lubrication, door opening / closing or breakage detection (S2: NO), the control unit 20 determines whether or not to end the process based on the presence or absence of an operation on the power switch ( Step S3). When it determines with not complete | finishing a process (S3: NO), the control part 20 returns a process to step S2, and reaches the timing which complete | finishes a process until it becomes necessary to perform greasing, door opening / closing, or breakage detection. Wait until. When it determines with complete | finishing a process (S3: YES), the control part 20 stops operation | movement of the fan 16, the interior lamp 17, and the backlight 18 by giving the instruction | indication to the switch part 43 (step S4), and complete | finishes a process. To do.

  When it is determined that it is necessary to perform lubrication, door opening / closing or breakage detection (S2: YES), the control unit 20 performs the first electrical load (fan 16, interior lamp 17 and back) operating at that time. The operating power amount of the light 18) and the operating power of the second electrical load (the greasing pump 50, the door opening / closing motor 51 or the breakage detection motor 52) related to the process determined to be necessary in step S2. The total power amount with the amount is calculated (step S5). Next, the control unit 20 determines whether or not the total power amount calculated in step S5 is equal to or greater than a predetermined power amount (step S6). When the total power amount is less than the predetermined power amount (S6: NO), the control unit 20 advances the process to step S32 without stopping the operation of the first electrical load.

  When the total power amount is equal to or greater than the predetermined power amount (S6: YES), the control unit 20 operates with the operating power amount of the first electrical load that is operating at that time, excluding the fan 16, and the second power source that operates. The total electric energy with the electrical load is calculated (step S7). Next, the control unit 20 determines whether or not the total power amount calculated in step S7 is equal to or greater than a predetermined power amount (step S8). When the total power amount is less than the predetermined power amount (S8: NO), the control unit 20 selects the fan 16 as the first electric load for stopping the operation, and gives an instruction to the switching unit 43 to operate the fan 16. Is stopped (step S9), and the process proceeds to step S32.

  When the total power amount is equal to or greater than the predetermined power amount (S8: YES), the control unit 20 operates with the operating power amount of the first electrical load that is operating at that time excluding the interior lamp 17 and the first power amount to be operated. The total electric energy with the two electric loads is calculated (step S10). Next, the control unit 20 determines whether or not the total power amount calculated in step S10 is equal to or greater than a predetermined power amount (step S11). When the total power amount is less than the predetermined power amount (S11: NO), the control unit 20 can stop the operation of the interior lamp 17 depending on whether or not the door provided on the splash cover of the machining center is closed. It is further determined whether or not there is (step S12). When the door of the splash cover is in the closed state and the operation lamp 17 can be stopped (S12: YES), the control unit 20 selects the first electric load for stopping the operation of the lamp 17 and switches the switching unit. The operation of the interior lamp 17 is stopped by giving an instruction to 43 (step S13), and the process proceeds to step S32.

  When the total power amount is equal to or greater than the predetermined power amount (S11: YES), or when the splash cover door is in an open state and the interior lamp 17 cannot be stopped (S12: NO), the control unit 20 The total electric energy of the first electric load operating at that time excluding 16 and the interior lamp 17 and the second electric load to be operated is calculated (step S14). Next, the control unit 20 determines whether or not the total power amount calculated in step S14 is equal to or greater than a predetermined power amount (step S15). When the total power amount is less than the predetermined power amount (S15: NO), the control unit 20 further determines whether or not the operation of the interior lamp 17 can be stopped (step S16). When the interior lamp 17 can stop the operation (S16: YES), the control unit 20 selects the fan 16 and the interior lamp 17 as the first electrical load to stop the operation, and gives an instruction to the switching unit 43. The operation of the interior lamp 17 is stopped (step S17), the operation of the fan 16 is stopped (step S18), and the process proceeds to step S32.

  When the total power amount is equal to or greater than the predetermined power amount (S15: YES), or when the interior lamp 17 cannot stop operating (S16: NO), the control unit 20 operates at that time except for the backlight 18. The total electric energy of the operating electric energy of the first electric load and the second electric load to be operated is calculated (step S19). Next, the control unit 20 determines whether or not the total power amount calculated in step S19 is equal to or greater than a predetermined power amount (step S20). When the total power amount is less than the predetermined power amount (S20: NO), the control unit 20 selects the backlight 18 as the first electrical load for stopping the operation, and performs the backlight stop preparation process (step S21). ) The operation of the backlight 18 is stopped by giving an instruction to the switching unit 43 (step S22), and the process proceeds to step S32.

  FIG. 10 is a flowchart showing the procedure of the backlight stop preparation process, and is a process performed in steps S21, S25, and S28 of the flowchart shown in FIG. In the backlight stop preparation process, the control unit 20 determines whether or not an operation has been performed on the operation panel 25 within a predetermined period before the current time (step S51). When the operation panel 25 is operated within a predetermined period (S51: YES), the control unit 20 displays a message for requesting permission to stop the backlight 18 on the liquid crystal display unit of the operation panel 25, and responds thereto. By accepting the operation on the operation panel 25, it is determined whether or not the stop permission of the backlight 18 is given (step S52). When the stop permission of the backlight 18 is not given (S52: NO), the control unit 20 returns the process to step S51 and no operation is performed for a predetermined time, or the stop permission of the backlight 18 is permitted. Repeat the process until given. When the operation panel 25 has not been operated for a predetermined time (S51: NO), or when the backlight 18 is permitted to be stopped (S52: YES), the control unit 20 performs the backlight stop preparation process. And the process returns to the flowchart shown in FIG.

  When the total power amount is equal to or greater than the predetermined power amount (S20: YES), the control unit 20 includes the operating power amount of the first electrical load operating at that time excluding the fan 16 and the backlight 18, and The total amount of power with the second electric load to be operated is calculated (step S23). Next, the control unit 20 determines whether or not the total power amount calculated in step S23 is equal to or greater than a predetermined power amount (step S24). When the total power amount is less than the predetermined power amount (S24: NO), the control unit 20 selects the fan 16 and the backlight 18 as the first electrical load to stop the operation, and after performing the backlight stop preparation process (Step S25) By giving an instruction to the switching unit 43, the operation of the backlight 18 is stopped (Step S26), the operation of the fan 16 is stopped (Step S27), and the process proceeds to Step S32.

  When the total power amount is equal to or greater than the predetermined power amount (S24: YES), the control unit 20 selects the fan 16, the interior lamp 17 and the backlight 18 as the first electrical load for stopping the operation, and prepares for the backlight stop. After the processing (step S28), the operation of the backlight 18 is stopped by giving an instruction to the switching unit 43 (step S29), the operation of the interior lamp 17 is stopped (step S30), and the operation of the fan 16 is performed. Stop (step S31) and proceed to step S32.

  Next, the control unit 20 gives an instruction to the switching unit 43 to start the operation of the target second electrical load (either the grease pump 50, the door opening / closing motor 51, or the breakage detection motor). (Step S32). Thereafter, the control unit 20 determines whether or not to end the operation of the second electrical load by determining whether or not the time for operating the second electrical load has elapsed (step S20). If it is determined not to end (S33) (S33: NO), the operation of the second electrical load is continued. When it determines with making it complete | finish (S33: YES), the control part 20 stops operation | movement of the 2nd electrical load operated in step S32 by giving the instruction | indication to the switch part 43 (step S34). Thereafter, the control unit 20 gives an instruction to the switching unit 43 to start the operation of the backlight 18 (step S35), start the operation of the interior lamp 17 (step S36), and start the operation of the fan 16. (Step S37), the process returns to step S2. Thereafter, the control unit 20 repeatedly performs the processes shown in the flowcharts of FIGS.

  The control unit 20 of the machining center having the above configuration continuously operates the first electric load such as the fan 16, the interior lamp 17 and the backlight 18 to supply the greasing pump 50, the door opening / closing motor 51 or the breakage detection. When operating a second electrical load such as the motor 52, the operation is stopped by selecting one or more first electrical loads so that the total amount of operating power does not exceed a predetermined amount of power. By adopting such a configuration, the second electrical load can be operated without exceeding the power capacity of the fuse 41 or the AC / DC converter 42. Therefore, the increase in capacity of the fuse 41 or the AC / DC converter 42 can be suppressed, and the cost increase of the machining center can be suppressed.

  In addition, the first electrical load that temporarily stops operation includes the fan 16, the interior lamp 17, and the backlight 18, so that these electrical loads should normally operate continuously. However, even if the operation is temporarily stopped for a short period, the influence on the machining operation of the machining center is small. However, it is not preferable that the operation of the backlight 18 is stopped during the operation of the operation panel 25. Therefore, when the operation on the operation panel 25 has not been performed for a predetermined period of time, or the backlight 18 is permitted to be stopped. When accepted, by temporarily stopping the operation of the backlight 18, it is possible to prevent the backlight 18 from being suddenly stopped when the operator is operating the operation panel 25.

  The second electrical load includes a greasing pump 50, a door opening / closing motor 51, and a breakage detection motor 52. The greasing pump 50 may be operated at a frequency of about once every several hours, and the operation time is also about several seconds to several tens of seconds. The door opening / closing motor 51 operates when the workpiece is not processed, and the operation time is about several seconds to several tens of seconds. The breakage detection motor 52 operates when changing tools, and the operation time is about several seconds. As described above, since the operation time of the second electric load is short, even when the first electric load is temporarily stopped, the influence can be minimized.

  In addition, by adopting a configuration in which the control unit 20 selectively operates the plurality of second electrical loads (that is, does not operate simultaneously), the first electrical load that temporarily stops the operation is configured. The number can be reduced.

  In the present embodiment, the fan 16, the interior lamp 17 and the backlight 18 have been described as examples of the first electrical load that operates continuously. However, the first electrical load is other than these. May be. Further, only the fan 16 and the interior lamp 17, only the fan 16 and the backlight 18, and only the interior lamp 17 and the backlight 18 may be used. Similarly, the grease pump 50, the door opening / closing motor 51, and the breakage detection motor 52 have been described as examples of the second electrical load that operates intermittently. However, the second electrical load is other than these. May be. Further, only the grease pump 50 and the door opening / closing motor 51 may be provided, only the grease pump 50 and the breakage detection motor 52 may be provided, and only the door opening / closing motor 51 and the breakage detection motor 52 may be provided. In addition, the second electrical load is configured to operate alternatively, but is not limited thereto, and a configuration in which a plurality of second electrical loads are operated simultaneously may be employed.

  Moreover, the operating electric energy of each electric load shown in FIG. 4 is an example, and is not limited to this. Similarly, the operation switching of the electrical load shown in FIG. 5 is an example, and the present invention is not limited to this. Moreover, although the control part 20 was set as the structure which selects the 1st electrical load which stops in order of the fan 16, the interior lamp 17, and the backlight 18, this is an example and performs selection in another order. May be. Further, in step S24 of the flowcharts shown in FIGS. 6 to 9, the control unit 20 stops the operations of the fan 16, the interior lamp 17 and the backlight 18 when the total power amount is equal to or greater than the predetermined power amount. However, the present invention is not limited to this, and it is also possible to calculate the total amount of power excluding the interior lamp 17 and the backlight 18 and stop the operation of the interior lamp 17 and the backlight 18.

5 Spindle Head 5A Spindle 7 Tool Change Mechanism 8 Table 9 Control Box 15 Tool Change Arm 16 Fan (First Electric Load)
17 Aircraft light (first electrical load, electric light)
18 Backlight (first electrical load)
20 control unit (calculation means, selection means, control means)
21 CPU
22 ROM
24 Input / Output Unit 25 Operation Panel 30 Servo Amplifier 41 Fuse 42 AC / DC Converter 43 Switching Unit 50 Grease Pump (Second Electric Load, Pump)
51 Door opening / closing motor (second electrical load)
52 Breakage detection motor (second electrical load)
100 AC power supply

Claims (5)

In a machine tool that drives a mounted tool to process a workpiece,
A plurality of first electrical loads that are supplied with power from the same power source and operate continuously, and a plurality of second electrical loads that operate intermittently;
Calculating means for calculating a total amount of operating electric energy of the second electric load to be operated and operating electric energy of the first electric load during operation when operating at least one second electric load; ,
When the total amount of operating power calculated by the calculating means exceeds a predetermined power amount, the plurality of first electric loads during operation are set so that the total amount of operating power does not exceed the predetermined power amount. Selecting means for selecting one or more first electrical loads that temporarily cease operation;
The operation of the first electrical load selected by the selection means is stopped, the second electrical load is operated, and after the operation of the second electrical load is finished, the first electrical load is And a control means for resuming the operation of the machine tool. 2. The machine tool according to claim 1, wherein the plurality of first electric loads are at least two of a fan, an electric lamp, and an operation panel backlight for cooling the inside. The plurality of first electrical loads includes a backlight of the operation panel,
The control means stops the operation of the backlight when an operation on the operation panel is not performed for a predetermined time or when an operation for permitting the stop of the backlight is received by the operation panel. The machine tool according to claim 2, wherein the machine tool is characterized. The plurality of second electric loads include a pump that supplies or lubricates a mechanism related to processing, a door opening / closing motor that opens and closes a door provided on a cover that covers the mechanism related to processing, and contact with a tool. 4. The contact member for detecting breakage of the tool in response to non-contact includes at least two of breakage detection motors rotating toward the tool. 5. The machine tool according to one. The machine tool according to claim 4, wherein the control unit is configured to selectively operate the pump, the door opening / closing motor, and the breakage detection motor.

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