JPWO2020012547A1 - Numerical control device - Google Patents

Abstract

A numerical control device 1 for controlling a machine tool including an automatic tool changing device 300 with a tool magazine includes a machining program 51, a storage unit 50 that stores tool data 52 regarding a plurality of tools, and a plurality of tools based on the tool data 52. A tool life determining unit 31 that determines a tool life that satisfies a predetermined tool life determination criterion and a tool replacement time that is the time until the next tool magazine rotation when the machining program 51 is started. A replacement time calculation unit 62 and a display unit 10 for displaying the tool replacement time and the tool data relating to the tool life, and when the execution of the machining program 51, the tool replacement time and the tool data relating to the tool life are displayed. Is characterized by.

Description

The present invention relates to a numerical control device that controls a machine tool.

Various types of tools are used for cutting with a machine tool in order to obtain a desired workpiece. A device for automatically exchanging tools during machining is called an automatic tool changer (ATC), and a machine tool equipped with a numerical control device is generally equipped with this automatic tool changer. Some automatic tool changers are equipped with a device called a tool magazine that stores multiple tools, and that has a structure for exchanging the tool mounted on the motor (spindle) that rotates the tool with the tool in the tool magazine. is there. The automatic tool change selects the next tool to be used from the multiple tools installed in the tool magazine according to the instructions (tool change command) of the machining program executed on the numerical controller to control the machine tool. Then, the tool magazine is rotated and moved to a predetermined position (ATC position) close to the spindle, which is the tool replacement position, and the tool mounted on the spindle is replaced with the tool at the ATC position.

If the tool continues to be cut, it will not be able to be machined to the desired dimensions due to wear, breakage, or other life. The tool mounted in the tool magazine or the spindle, which has become unsuitable for machining due to its life, needs to be replaced by a new tool by the operator. The operator swivels the tool magazine to move the tool to be replaced to a position suitable for replacement, and manually replaces it with a new tool. Since the work of changing tools is generally performed while the machining program is not operating automatically, it is necessary to stop the automatic operation and then replace the tool, which is one of the causes of the decrease in the machine tool operating rate. There is.
In order to prevent a decrease in the operating rate of a machine tool, for example, in Japanese Unexamined Patent Publication No. 10-151539, there is a tool exchange pocket for holding a tool to be exchanged, which is independent of the tool magazine, and is automatically provided between the tool magazine and the tool exchange pocket. By providing the tool exchanging actuator for exchanging the tool while the operation of the tool exchanging device is stopped, the exchanging of the tool can be performed without stopping the entire machine tool.

Japanese Patent Laid-Open No. 10-151539

In Patent Document 1, the tool can be replaced without stopping the automatic operation. However, it is necessary to equip the machine tool with a tool change pocket and a tool change actuator, which raises a problem that the direct material cost of the machine tool increases. Also, due to the limitation of the number of tools that can be stored in the tool magazine, the purpose is to replace the tools that could not be stored in the tool magazine in advance with the used tools in the tool magazine. Tools) cannot be specified and replaced.

The present invention is made in view of the above, without adding a special device, without stopping the automatic operation even during automatic operation of the machine tool, the operator can replace the life tool, An object is to obtain a numerical control device that displays tool data necessary for replacement.

In order to solve the above-mentioned problems and achieve the object, the numerical control device of the present invention controls a machine tool provided with an automatic tool changing device with a tool magazine that stores a plurality of tools. Further, the numerical control device of the present invention is a storage unit that stores a machining program and tool data relating to a plurality of tools, and a life tool that satisfies a predetermined life determination criterion from among the plurality of tools based on the tool data. Tool life determination unit that determines the tool life, and a tool replacement time calculation unit that calculates the tool replacement time that is the time until the next tool magazine rotation when the machining program is started, the tool replacement time, and the tool data related to the life tool And a display unit for displaying. Further, the numerical control device of the present invention is characterized in that, when the execution of the machining program is started, the tool change time and the tool data regarding the life tool are displayed.

The numerical control device according to the present invention displays the tool data necessary for the replacement of the life tool so that the machine tool is automatically operated without adding a special device to the generally used automatic tool changer. There is an effect that the operator can replace the life tool without stopping the automatic operation even during operation, and the operation rate of the machine tool can be improved.

It is a schematic diagram of the automatic tool changer which this invention makes object. It is a functional block diagram which shows the structure of the numerical control device which concerns on Embodiment 1-5. 7 is an example of tool data stored in the storage unit of the numerical control devices according to the first to fifth embodiments. It is an example of a machining program executed by the numerical control device according to the first to fifth embodiments of the present invention, and an example of a required time table between tool exchange commands created based on the machining program. FIG. 5 is a diagram showing the contents displayed in a tool replacement time display area 102 and a replacement required tool display area 103 in the numerical control device according to the first embodiment. FIG. 11 is a diagram showing the contents displayed in a tool replacement time display area 102 and a replacement required tool display area 103 in the numerical control device according to the second embodiment. FIG. 16 is a diagram showing an example of display contents until the operator selects a replacement tool and completes the replacement with a new tool in the numerical control device according to the third embodiment. FIG. 11 is a diagram showing the contents displayed in a tool change time display area 102 in the numerical control device according to the fourth embodiment. FIG. 16 is a diagram showing the contents displayed on the terminal of the operator in the numerical control device according to the fifth embodiment. It is a figure showing the example of hardware constitutions of the control operation part concerning each embodiment.

A numerical controller according to an embodiment of the present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
The numerical controller 1 according to the first embodiment controls the machine tool 200. The machine tool 200 includes an automatic tool changer 300 for changing a tool attached to a spindle. The automatic tool changer 300 includes a tool magazine 310 that stores a plurality of tools.

First, a method of replacing a tool in the tool magazine by a general manual operation will be described. FIG. 1(a) is a schematic view of the entire automatic tool changer equipped with a general tool magazine 310 targeted by the present invention, and FIG. 1(b) is a side view of an ATC position 316 (tool change position). FIG. 1(c) is an external view of the automatic tool changer seen from the position of the operator 600 shown in FIG. 1(a). The tool magazine 310 stores a plurality of tools by mounting each tool in a plurality of tool pots 314 arranged in a magazine chain 313 that can be rotated in an annular shape. When a tool to be used next is designated by a machining program (not shown), a PLC (Programmable Logic Controller) 90 (not shown) that controls the automatic tool changer is attached to which tool pot 314 the tool designated according to the ladder program 91 is attached. It is determined whether or not the tool pot 314 on which the designated tool is mounted is moved to the ATC position 316 by driving the magazine motor 311 and operating the magazine chain 313. The tool to be used next after moving to the ATC position 316 is the exchange tool 204. Further, the PLC 90 drives the machining control motor 211 (not shown) based on the ladder program 91 to move the position of the spindle motor 201 to a position suitable for tool replacement. The tool attached to the spindle motor 201 and used up to now is referred to as a spindle tool 203. Thereafter, the PLC 90 operates the ATC arm 303 according to the ladder program 91 to replace the exchange tool 204 with the spindle tool 203. In this way, the tool designated as the tool to be used next by the machining program is mounted on the spindle motor 201 and can be used for machining.

When the operator 600 replaces a tool that is no longer suitable for machining due to wear, breakage, or the like with a new tool, the operator 600 recognizes which tool pot 314 the tool to be replaced is attached to, and then the magazine manual operation unit. The magazine rotation button 13 of 12 is operated to move the tool pot 314 in which the tool to be replaced is mounted to the tool replacement position 317 suitable for replacement. The tool to be replaced that has moved to the tool replacement position 317 is referred to as a replacement tool. The operator 600 then opens the magazine door 315 and replaces the replacement tool with a new tool prepared by the operator.

When the operator 600 replaces the tools in the tool magazine in the automatic tool changer having the configuration as shown in FIG. 1, when the operator 600 is in the automatic operation, the operator 600 will rotate the tool magazine according to the instruction from the machining program. Since I do not know, it is common to perform the work of changing the tool while the automatic operation is stopped. Further, in order to enhance safety, a magazine operation for selecting a mode in which the tool magazine operates according to a machining program (automatic mode) or a mode in which the tool magazine operates according to an operation of the magazine manual operation unit 12 of the operator 600 (manual mode). The mode selection switch 14 may be provided. When the magazine operation mode selection switch 14 is in the manual mode (M side in FIG. 1C), the operator 600 is prohibited from executing the automatic operation, or the tool change command is issued from the machining program during the automatic operation. Also controls the operation of the magazine motor 311 so that the tool magazine does not rotate.

The numerical controller according to the present embodiment will be described below. FIG. 2 is a diagram showing the configuration of the first embodiment of the numerical controller according to the present invention. The numerical controller 1 controls the machine tool 200. The numerical controller 1 includes a control calculation unit 20, a display unit 10, an operation input unit 11, and a magazine manual operation unit 12.

The display unit 10 displays information necessary for the operator on a display screen (not shown). The operation input unit 11 is a unit that receives an operation input from an operator and inputs information to the control calculation unit 20. The operation input unit 11 is configured by an input unit such as a keyboard, a touch panel, a button, or a mouse (not shown), receives an input of a command or the like to the numerical controller 1 by the operator 600, or receives a machining program or a parameter or the like, and the control calculation unit 20. To enter.

The control calculation unit 20 includes a screen processing unit 70, an input control unit 22, a communication control unit 80, a storage unit 50, a tool life management unit 30, an analysis processing unit 21, a simulation processing unit 40, and an automatic operation. It has a processing unit 60 and a PLC 90. The screen processing unit 70, the input control unit 22, the communication control unit 80, the tool life management unit 30, the analysis processing unit 21, the simulation processing unit 40, the automatic operation processing unit 60, and the PLC 90 are storage units. The storage unit 50 is connected to the storage unit 50 to write and read information. In the following description, it may be omitted that the storage unit 50 is interposed when describing writing and reading of information between the respective components.

The screen processing unit 70 performs a process of displaying various information on the display unit 10. The screen processing unit 70 includes a tool replacement time display processing unit 71 and a replacement required tool display processing unit 72. The tool replacement time display processing unit 71 performs processing for displaying the tool replacement time, which is the time until the next tool magazine rotation, on the display unit 10, and the replacement required tool display processing unit 72 displays the tool data of the replacement required tool on the display unit 10. Is displayed.

The input control unit 22 receives information input from the operation input unit 11.

The storage unit 50 stores a machining program, tool data, parameters, and shared data. The tool data includes information such as tool name, tool length, tool diameter, tool usage record information, tool number, and tool pot number on which the tool is mounted. FIG. 3 shows an example of tool data. The parameter is data used in the processing of the control calculation unit 20. Shared data is data that is temporarily used.

The tool life management unit 30 has a tool life determination unit 31 that determines the life of the tool.

When the machining program is designated by the operation input unit 11, the analysis processing unit 21 reads the designated machining program from the storage unit 50 and performs an analysis process on each block (each row) of the machining program. The analysis processing unit 21 analyzes, for example, a G command (command relating to axis movement, etc.), a T command (tool replacement command), an S command (spindle motor rotation speed command), and an M command (machine operation command). When the analyzed block includes the M command, the S command, or the T command, the analysis processing unit 21 sends the analysis result to the PLC 90 via the storage unit 50. Further, when the analyzed block includes the G command, the analysis processing unit 21 sends the analysis result to the motor control command generation unit 63 via the storage unit 50.

The simulation processing unit 40 includes a tool change command time calculation unit 41 and a tool calculation unit 42. The tool exchange command inter-time calculating unit 41 calculates the time required to execute from the tool exchange command described in the machining program to the next tool exchange command. The used tool calculation unit 42 calculates the tool to be used from the tool exchange command described in the machining program.

The automatic operation processing unit 60 includes an operation time calculation unit 61 that calculates an elapsed time from the latest tool replacement command to the current time, a tool replacement time calculation unit 62 that calculates a tool replacement time, and a motor control unit. A motor control command generator 63 that generates a command.

When the magazine manual operation unit 12 is operated or an input is made via an I/O (Input/Output) interface (not shown), the PLC 90 executes the operation or the operation corresponding to the input. The PLC 90 stores a ladder program 91 in which machine operations are described.

The machine tool 200 includes an automatic tool changing device 300, a spindle motor 201 that rotates a tool, a spindle motor control unit 202 that controls the spindle motor 201, and a machining control motor that moves the position of the spindle motor 201 with respect to the ATC arm 303. 211, and a processing control motor control unit 212 that controls the processing control motor 211.

The automatic tool changer 300 includes a tool magazine 310. The tool magazine 310 includes a magazine motor 311 that rotates the magazine chain 313, and a magazine motor control unit 312 that controls the magazine motor 311.

When the operator executes the automatic operation, the operator selects a machining program for executing the automatic operation in advance by using a function called an operation search. The automatic start of the selected machining program is input to the ladder program 91 via an I/O (Input/Output) interface (not shown), and the ladder program 91 determines whether or not the automatic start is possible. Then, the analysis processing unit 21 reads the machining program selected in advance by the operation search from the storage unit 50 and performs the analysis process. By sending the analysis result to the motor control command generation unit 63 via the storage unit 50, the automatic driving process is executed. In the numerical control device according to the present invention, when the machining program is started to be executed by the automatic operation processing unit 60, or at the same time when the machining program is selected by the operation search, the machining program is virtually executed by the simulation processing unit 40 to perform the automatic operation. The simulation analysis of the machining program executed in. In the simulation processing unit 40, the inter-tool-change-command time calculation unit 41 calculates the time required for execution from the tool exchange command described in the machining program to the next tool exchange command. This calculation is performed for every tool change command, and all required times are calculated. Further, the used tool calculation unit 42 calculates the tool to be used from the tool replacement command described in the machining program.

The automatic operation processing unit 60 calculates the tool replacement time, which is the time until the next tool magazine swing, while the motor control command generation unit 63 generates a command for each motor according to the machining program. Specifically, the operating time calculator 61 first calculates the elapsed time from the most recently executed tool change command to the current time. Next, the tool replacement time calculation unit 62 calculates the elapsed time from the required time between the tool replacement command of the currently used tool and the tool replacement command of the tool to be used next calculated by the tool replacement command time calculation unit 41. Subtract and calculate the tool change time. The automatic operation processing unit 60 stores the calculated tool replacement time in the shared data 54 of the storage unit 50. The tool replacement time display processing unit 71 acquires the tool replacement time from the shared data 54 of the storage unit 50 and displays the tool replacement time on the display unit 10. In addition, the tool life determination unit 31 of the tool life management unit 30 determines a predetermined life based on the tool usage record information such as the cumulative number of times of use of the tool and the cumulative cutting time, which is stored in the storage unit 50 as tool data. A life tool that satisfies the determination criteria is determined, and information on the identified tool that is the life tool is sent to the replacement necessary tool display processing unit 72. The replacement-needed tool display processing unit 72 performs processing for displaying the acquired information on the life tool on the display unit 10. The display unit 10 displays the tool replacement time in the tool replacement time display area 102, and displays the information about the life tool such as the tool pot number where the life tool is attached and the tool name of the life tool in the tool display area 103 requiring replacement. To do.

The operator determines whether to replace the tool in the tool magazine based on the contents displayed in the tool replacement time display area 102 and the replacement required tool display area 103 of the display unit 10. When changing the tool, the magazine operation mode selection switch 14 of FIG. 1C is switched to the manual mode (M side of FIG. 1C). When the switching information of the magazine operation mode selection switch 14 is sent from the magazine manual operation unit 12 to the PLC 90, the PLC 90 recognizes that the manual mode has been switched according to the ladder program 91 and displays it in the tool replacement time display area 102. The tool magazine is controlled so as not to rotate even if the time until the next turning of the tool magazine is zeroed and the tool change is instructed from the machining program during automatic operation. This control is called tool magazine swivel prohibition control. Next, the operator recognizes which tool pot in the tool magazine the life tool is attached to from the contents displayed in the replacement required tool display area 103, and operates the magazine rotation button 13 in FIG. 1(c). Then, the tool pot 314 having the life tool attached thereto is moved to the tool replacement position 317 suitable for replacement. At that time, when the operation information of the magazine rotation button 13 is sent from the manual magazine operation unit 12 to the PLC 90, the PLC 90 controls the magazine motor 311 connected to the magazine motor control unit 312 according to the ladder program 91. Further, while the time until the next tool magazine rotation displayed in the tool change time display area 102 remains, the PLC 90 shuts off the power supply of the machining control motor 211 or stops the automatic operation according to the ladder program 91. Continue automatic operation without doing anything.

When the tool pot 314 equipped with the life tool is moved to the tool replacement position 317, the operator opens the magazine door 315 of FIG. 1 and replaces the life tool with a new tool prepared by the operator. When the replacement is completed, the magazine door 315 is closed and the magazine operation mode selection switch 14 in FIG. 1C is switched to the automatic mode (A side in FIG. 1C). When the switching information of the magazine operation mode selection switch 14 is sent from the magazine manual operation unit 12 to the PLC 90, the PLC 90 recognizes that it has switched to the automatic mode, and according to the ladder program 91, the tool magazine rotation prohibition control from the machining program. To cancel. In this way, if the tool replacement, which is confirmed by the operator before the tool replacement, is completed within the time until the next turning of the tool magazine, the tool that needs replacement can be replaced without stopping the automatic operation. If the tool change cannot be completed within the time until the next tool magazine rotation, the tool magazine rotation cannot be performed due to the tool magazine rotation prohibition control and the automatic operation is stopped, but the operator safely performs the tool replacement. be able to. Then, when the tool change is completed and the magazine operation mode selection switch 14 of FIG. 1(c) is switched to the automatic mode (A side of FIG. 1(c)), the magazine operation sent from the magazine manual operation unit 12 to the PLC 90. The PLC 90 recognizes that the mode has been switched to the automatic mode based on the switching information of the mode selection switch 14, and restarts the automatic operation according to the ladder program 91.

FIG. 4 is an example of a machining program executed by the automatic operation processing unit 60, and an example of a required time table between tool change commands created based on the machining program. In the blocks of the machining program 51 starting from N101, N201, N301, N401, and N501, there is a tool replacement command (T command). The tool change command is composed of an identifier "T" of the tool change command and a "tool number" which is a number for designating a tool. When the tool exchange command is issued, the tool mounted on the spindle motor 201 is changed to the tool designated by the tool exchange command and the workpiece is machined. The simulation processing section 40 analyzes the machining program, and the tool calculation section 42 calculates a tool number indicating the tool to be used and the tool change command time calculation section 41 calculates a required time between tool change commands. The simulation processing unit 40 associates the machining program number, the calling sequence number of the T command, the tool number, and the required time and records them in the shared data 54 of the storage unit 50 as a required time table 541 between the tool replacement commands.

FIG. 5 shows an example of display contents displayed on the display unit 10 of FIG. The display unit 10 has a tool replacement time display area 102 and a tool replacement necessary display area 103 in addition to the area for displaying the program position, tool information currently used, and the like. The time until the next magazine operation is displayed in the tool replacement time display area 102, and it is indicated that the tools in the tool magazine can be replaced without stopping the automatic operation within the displayed time. Information regarding a lifespan tool is displayed in the replacement required tool display area 103, which indicates which tool in the tool magazine needs to be replaced and which tool pot in the tool magazine is stored.

As described above, according to the numerical controller according to the first embodiment, the time required between the tool replacement commands described in the machining program and the elapsed time from the latest tool replacement command to the current time in the automatic operation. From this, the time until the next tool magazine rotation is calculated, and the time until the next tool magazine rotation and the life tool are displayed, so the operator does not stop the automatic operation during automatic operation, and the tool magazine The inner tool can be replaced. Therefore, it is possible to improve the operating rate of the machine tool.

Embodiment 2.
Next, a numerical controller according to the second embodiment will be described with reference to the drawings. The configuration of the second embodiment of the numerical control device according to the present invention is the same as that of the first embodiment. The processing until the time until the next tool magazine rotation is displayed in the tool replacement time display area 102 is the same as that in the first embodiment.

In the replacement required tool display area 103, the tool life determining unit 31 displays the service life tool as in the first embodiment, but when the tool is used by the machining program calculated by the tool calculation unit 42. , The background of the display is highlighted by shading.

FIG. 6 shows an example of display contents displayed on the display unit 10 of FIG. The replacement-necessary-tool display processing unit 72 acquires the information regarding the life-changing tool from the tool life determining unit 31 and displays the replacement-necessary tool in the replacement-necessary tool display area 103 of the display unit 10 when using the tool-use calculating unit. The information of the tool to be used is acquired from 40, and when the life tool is the tool to be used, the tool data regarding the tool to be used is emphasized and displayed. 6 is different from FIG. 5 of the first embodiment, the content displayed in the replacement necessary tool display area 103 is the display content in which the tools used in the machining program out of the life tools are highlighted.

As described above, according to the numerical control device according to the second embodiment, when the life tool is displayed, when it corresponds to the tool used in the machining program, the tool is highlighted so that the tool to be replaced cannot be replaced. Above all, it is possible to recognize the tool to be replaced with priority, the replacement is surely performed, and it is possible to prevent the automatic operation from being stopped midway due to the existence of a tool that cannot be used due to its life. With such a configuration, the operating rate of the machine tool can be improved.

Embodiment 3.
Next, a numerical controller according to the third embodiment will be described with reference to the drawings. The configuration of the numerical control device according to the third embodiment of the present invention is the same as that of the first embodiment. Further, the processing until the time until the next tool magazine rotation is displayed in the tool replacement time display area 102 and the lifespan tool is displayed in the tool replacement required display area 103 is the same as in the first and second embodiments.

When performing the tool replacement, the operator selects the replacement tool from the tools determined to have reached the end of life displayed in the replacement-needed tool display area 103 by using the operation input unit 11 of FIG. When the input control unit 22 receives the information on the selected replacement tool, the information is sent to the PLC 90 via the storage unit 50. According to the ladder program 91, the PLC 90 identifies which tool pot 314 the replacement tool is attached to from the information of the tool data 521 stored in the storage unit 50 as shown in FIG. When the tool pot 314 is specified, the PLC 90 controls the magazine motor 311 connected to the magazine motor control unit 312 of the tool magazine 310 to move the tool pot 314 equipped with the tool to be replaced to the tool replacement position 317 suitable for replacement. ..

Next, the PLC 90 prohibits the operation of the magazine motor 311 so that the tool magazine 310 does not rotate even if a tool replacement command is executed from the machining program. The operator opens the magazine door, removes the replacement tool from the tool pot 314 and replaces it with a new tool. After that, when the operator closes the magazine door and inputs that the tool replacement is completed from the operation input unit 11, the input control unit 22 notifies the PLC 90 via the storage unit 50 that the tool replacement is completed. Upon receiving the notification, the PLC 90 releases the operation prohibition of the magazine motor 311 and returns the tool pot 314 having a new tool mounted to the position before being moved to the tool replacement position 317. Further, the PLC 90 notifies the tool life management unit 30 that the replacement tool has been replaced with a new tool, and the tool life management unit 30 that has received the notification of the corresponding replacement tool recorded in the storage unit 50 as tool data. Initialize tool usage record information such as cumulative number of times of use and cumulative cutting time. After that, when the tool replacement is instructed by the machining program, the tool usage record information has been initialized, it is determined that the tool life has not reached the end, and the tool replacement with the new tool is performed. Be seen.

FIG. 7 shows an example of display contents until the operator selects a replacement tool and completes the replacement with a new tool. When the operator selects a replacement tool using an operation input unit such as a touch panel, the numerical control device displays a movement confirmation display 105 to the tool replacement position 317. When OK is selected by the operator on the movement confirmation display 105 to the tool replacement position 317, the tool magazine 310 is rotated to move the replacement tool to the replacement position, and when the cancel is selected, the tool replacement work is interrupted. Further, when the operator closes the magazine door after the tool replacement is completed, the numerical controller recognizes that the tool replacement is completed, and displays the tool replacement completion confirmation display 106. When "replace with a tool of the same type and diameter" is selected on the tool replacement completion confirmation display 106, the tool usage record information of the replacement tool is initialized from the tool data 52 recorded in the storage unit 50, and " When "replace with tool of different type/diameter" is selected, the tool management screen (not shown) is entered, and the operator inputs the data corresponding to the new tool, whereby the tool data 52 stored in the storage unit 50 is saved. change. If "Cancel replacement" is selected on the tool replacement completion confirmation display 106, no processing is performed.

When the operator makes any selection on the tool replacement completion confirmation display 106, the tool replacement completion information indicating that the tool replacement is completed is sent from the input control unit 22 to the PLC 90. Upon receiving the tool replacement completion information, the PLC 90 controls the magazine motor 311 connected to the magazine drive unit 52, and returns the tool pot 314 in which a new tool is mounted to the position before moving to the tool replacement position 317. Replace the position of the replacement tool in the tool magazine. Normally, when the tool exchange is instructed, the exchange tool is moved to the ATC position 316 so that the exchange tool and the spindle tool can be exchanged only by the operation of the ATC arm 303. Therefore, if the tool exchange is performed from this state, the tool exchange is performed. After the tool magazine 310 is rotated by, and the tool replacement is completed, the position of the replacement tool in the tool magazine must be returned to its original position, or the position of the replacement tool will deviate from the ATC position 316. Then, a tool different from the replacement tool is moving to the ATC position 316, and only the tool replacement by the ATC arm 303 causes the tool different from the replacement tool to be attached to the spindle motor. Therefore, by returning the tool pot 314 in which a new tool is mounted to the position before moving to the tool replacement position 317, the position of the replacement tool also returns to the ATC position 316, and when a tool replacement is instructed. The exchange tool and the spindle tool can be exchanged simply by operating the ATC arm 303, and the tool exchange operation can be completed quickly.

As described above, when the tool to be replaced is selected from the tools determined to have reached the end of their lives, the numerical controller according to the third embodiment moves the tool pot 314 having the replacement tool selected by the operator to the replacement position. Then, when the operator completes the tool replacement, the tool pot 314 is returned to the original position, so that the operator does not manually operate the tool magazine 310 for the tool replacement and opens the magazine door during the automatic operation so that a new tool can be opened. Can be exchanged. With such a configuration, it is possible to reduce the work procedure when the operator replaces the tool, and reduce the operator's mistake in replacing the tool.

Fourth Embodiment
Next, a numerical controller according to the fourth embodiment will be described with reference to the drawings. The configuration of the fourth embodiment of the numerical control device according to the present invention is the same as that of the first embodiment. Further, the processing until the time until the next tool magazine rotation is displayed in the tool replacement time display area 102 and the lifespan tool is displayed in the tool replacement required display area 103 is the same as in the first and second embodiments.

The time until the next tool magazine rotation displayed in the tool replacement time display area 102 may be insufficiently long for tool replacement. In such a case, a time suitable for tool replacement, which is long enough to replace the tool, is displayed in the tool replacement time display area 102. Specifically, first, the operator presets a standard tool replacement time, which is a standard time required for tool replacement, as a parameter and stores it in the storage unit 50 of FIG. When the operator executes the automatic operation, the tool replacement time calculation unit 62 compares the calculated tool replacement time with the standard tool replacement time, and when it is determined that the tool replacement time is shorter, the tool replacement time is stored in the storage unit 50. A required time longer than the standard tool replacement time is retrieved from the required time table 541 between the tool change commands being executed. As a result of the search, when there are a plurality of required times longer than the standard tool exchange time, the tool exchange time calculation unit 62 selects the required time between the latest tool exchange commands from the block of the machining program currently being executed. The tool replacement time calculation unit 62 calculates the time to execute the tool replacement command corresponding to the selected required time from the current time, and sends the calculated time to the tool replacement time display processing unit 71 via the storage unit 50. The tool replacement time display processing unit 71 sends the acquired time to the display unit 10, and the display unit 10 displays it in the tool replacement time display area 102 as the time suitable for the tool replacement.

For example, when the standard tool replacement time is set to 300 seconds, the time until the next magazine operation shown in FIG. 5 is 3 minutes 12 seconds=192 seconds, which is insufficient for tool replacement. .. In such a case, the tool replacement time calculation unit 62 determines that the tool replacement time is shorter than the standard tool replacement time when 195 seconds, which is the tool replacement time, is calculated, and the tool replacement command interval table 541 of FIG. The required time longer than the standard tool replacement time is searched from the inside, and the required time 353s of the calling sequence number 2 and the tool number 5 of the latest T command is selected. Currently, machining is performed with the T command calling sequence number 1 and the tool number 3, and if the current time is 14:28:35, the tool is changed to a tool with the T command calling sequence number 2 and the tool number 5. Since the time until the next magazine operation is 3 minutes 12 seconds later, the time suitable for tool replacement is 14:28:35 seconds + 3 minutes 12 seconds = 14:31 minutes 47 seconds. FIG. 8 shows the display content 107 of the time suitable for the tool replacement displayed in the tool replacement time display area 102 of FIG. 14:31:47 is shown as a time suitable for tool change.

As described above, in the numerical control device according to the fourth embodiment, the time until the next tool magazine rotation is short compared to the standard tool replacement time required for tool replacement, and there is no sufficient length for tool replacement. Is selected from among the required times stored in the required time table 122 between the tool change instructions, the tool change instruction having a required time that is long enough to replace the tool is selected. By displaying the time suitable for replacement, the operator can immediately know when the tools in the tool magazine cannot be replaced and when they can be replaced. With such a configuration, it is possible to assist the operator in planned work.

Embodiment 5.
Next, a numerical controller according to the fifth embodiment will be described with reference to the drawings. The configuration of the fifth embodiment of the numerical control device according to the present invention is the same as that of the first embodiment. Further, the processing until the time until the next tool magazine rotation is displayed in the tool replacement time display area 102 and the lifespan tool is displayed in the tool replacement required display area 103 is the same as in the first and second embodiments. If the time until the next tool magazine rotation is short and the length is not long enough to replace the tool, a future time that is long enough to replace the tool is set as the tool replacement time display area 102. The processing up to the display of is the same as that of the fourth embodiment.

When the operator executes the automatic operation and moves away from the front of the machine tool, the operator does not notice the display even if the display unit 10 of FIG. 2 of the numerical controller indicates that the tool needs to be replaced. Therefore, the tool replacement time display processing unit 71 and the replacement necessary tool display processing unit 72 transmit information to be displayed in the tool replacement time display area 102 and the replacement necessary tool display area 103 to the display unit 10, and the communication control unit 80. Information to be notified to the operator's terminal 400 is also sent to the e-mail transmission unit 81. The mail transmission unit 81 sends the acquired information to be notified to the operator's terminal 400 to the operator's terminal 400 by mail.
FIG. 9 shows the mail notification content 110 of the tool replacement information transmitted to the operator's terminal 400. 14:31:47 is shown as a tool that needs to be replaced and a time suitable for the tool replacement.

As described above, the numerical control device according to the fifth embodiment includes the mail sending unit 81 that sends a mail to the operator, and notifies the operator of the tool requiring the tool replacement and the time suitable for the tool replacement, whereby the operator can You can know that you need to change tools even if you are not in front of the machine tool. With such a configuration, it is possible to prevent an automatic operation stop of the machine tool due to the operator forgetting to do the work, and it is possible to improve the operating rate of the machine tool.

Here, the hardware configuration of the control calculation unit 20 included in the numerical control device 1 will be described. FIG. 10 is a diagram illustrating a hardware configuration example of the control calculation unit according to the first to fifth embodiments.

The control calculation unit 20 can be realized by the control circuit 700 shown in FIG. 10, that is, the processor 701 and the memory 702. An example of the processor 701 is a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP) or system LSI (Large Scale Integration). An example of the memory 702 is a RAM (Random Access Memory) or a ROM (Read Only Memory).

The control calculation unit 20 is realized by the processor 701 reading and executing a program stored in the memory 702 for executing the operation of the control calculation unit 20. It can also be said that this program causes a computer to execute the procedure or method of the control calculation unit 20. The memory 702 is also used as a temporary memory when the processor 701 executes various processes.

The program executed by the processor 701 may be a computer program product having a computer-readable, non-transitory recording medium containing a plurality of instructions for performing data processing. .. The program executed by the processor 701 causes a computer to execute data processing by a plurality of instructions.

Further, the control calculation unit 20 may be realized by dedicated hardware. In addition, the functions of the control calculation unit 20 may be partially implemented by dedicated hardware and partially implemented by software or firmware.

The configurations described in the above embodiments are examples of the content of the present invention, and can be combined with other known techniques, and the configurations of the configurations are not departing from the scope of the present invention. It is also possible to omit or change parts.

1 numerical control device, 10 display unit, 11 operation input unit, 12 magazine manual operation unit, 13 magazine rotation button (forward/reverse rotation), 14 magazine operation mode selection switch, 20 control calculation unit, 21 analysis processing unit, 22 input Control unit, 30 tool life management unit, 31 tool life determination unit, 40 simulation processing unit, 41 tool change command time calculation unit, 42 used tool calculation unit, 50 storage unit, 51,511 machining program, 52,521 tool data , 53 parameters, 54 shared data, 60 automatic operation processing unit, 61 operating time calculation unit, 62 tool replacement time calculation unit, 63 motor control command generation unit, 70 screen processing unit, 71 tool replacement time display processing unit, 72 replacement Necessary tool display processing section, 80 communication control section, 81 mail sending section, 90 PLC, 91 ladder program, 101 display content, 102 tool replacement time display area, 103 replacement necessary tool display area, 105 tool replacement position Movement confirmation display, 106 Tool replacement completion confirmation display, 107 Display content of time suitable for tool replacement, 110 Email notification content of tool replacement information, 200 machine tool, 201 spindle motor, 202 spindle motor control unit, 203 spindle tool (now Tools used up to), 204 replacement tools (tools to be used next), 300 automatic tool changer, 211 machining control motor, 212 machining control motor control unit, 303 ATC arm, 310 tool magazine, 311 magazine motor 312 magazine motor control unit, 313 magazine chain, 314 tool pot, 315 magazine door, 316 ATC position (tool change position), 317 tool change position, 400 terminal, 541 time table between tool change commands, 600 operator

In order to solve the above-mentioned problems and achieve the object, the numerical control device of the present invention controls a machine tool provided with an automatic tool changing device with a tool magazine that stores a plurality of tools. In addition, the numerical control device of the present invention is a storage unit that stores a machining program, tool data regarding a plurality of tools , and standard tool replacement time, and a predetermined life determination from a plurality of tools based on the tool data. Based on a tool life determination unit that determines a tool life that satisfies the criteria, and a plurality of tool replacement commands that are described in the machining program, from the first tool replacement command that is executed first to the second tool replacement command that is executed next. The tool change command time calculation unit that calculates the time required to execute the tool change command and the operation time that calculates the elapsed time from the most recently executed tool change command to the current time when the machining program starts executing When the calculation unit and the machining program are started, calculate the tool change time, which is the time until the next tool magazine rotation based on the required time and the elapsed time, and if the tool change time is shorter than the standard tool change time, Based on the standard tool replacement time and the required time, a tool replacement time calculation unit that calculates a time to execute the first tool replacement command having a required time longer than the standard tool replacement time , a tool replacement time, and And a display unit that displays tool data regarding a life tool and displays the time as a time suitable for tool replacement . Further, the numerical control device of the present invention is characterized in that, when the machining program is started to be executed, the tool replacement time and the tool data regarding the life tool are displayed and the time is displayed as a time suitable for the tool replacement .

In order to solve the above-mentioned problems and to achieve the object, the numerical control device of the present invention controls a machine tool provided with an automatic tool changing device with a tool magazine that stores a plurality of tools. In addition, the numerical control device of the present invention is a storage unit that stores a machining program, tool data regarding a plurality of tools, and standard tool replacement time, and a predetermined life determination from a plurality of tools based on the tool data. Based on a tool life determination unit that determines a life tool that satisfies the criteria, and three or more tool replacement commands that are described in the machining program, the first tool replacement command that is executed first to the first tool replacement command that is executed next. When the tool change command time calculation unit that calculates the time required to execute the tool change command up to 2 and the machining program is started, the elapsed time from the most recently executed tool change command to the current time is calculated. When the operation time calculation unit and the machining program are started to execute, the tool change time, which is the time until the next tool magazine rotation, is calculated based on the required time and the elapsed time, and the tool change time is shorter than the standard tool change time. In this case, based on the standard tool replacement time and the required time, the tool replacement time calculation unit that calculates the time to execute the first tool replacement command that has a longer required time than the standard tool replacement time, and the tool replacement time , And a display unit that displays tool data relating to a life tool and displays the time as a time suitable for tool replacement. Further, the numerical control device of the present invention is characterized in that, when the machining program is started to be executed, the tool replacement time and the tool data regarding the life tool are displayed and the time is displayed as a time suitable for the tool replacement.

Claims (6)

A numerical control device for controlling a machine tool having an automatic tool changer with a tool magazine for storing a plurality of tools,
A machining program and a storage unit for storing tool data relating to the plurality of tools;
Based on the tool data, from the plurality of tools, a tool life determination unit that determines a life tool that satisfies a predetermined life criteria,
When the execution of the machining program is started, a tool replacement time calculation unit that calculates a tool replacement time that is the time until the next tool magazine swing,
A display unit that displays the tool replacement time and tool data regarding the life tool;
Equipped with
A numerical control device, which displays the tool replacement time and tool data regarding the life tool when the machining program is started to be executed. Based on a tool exchange command described in the machining program, a tool calculation unit for calculating a tool used in the machining program,
Further equipped with,
The display unit is
The numerical controller according to claim 1, wherein when the life tool is the tool to be used, the tool data regarding the life tool is highlighted. When the life tool is selected as a replacement tool, after moving the replacement tool to a tool replacement position suitable for replacement, based on the tool replacement completion information indicating that the tool replacement is completed, before moving to the tool replacement position PLC for controlling the tool magazine so as to return to the position of
The numerical control device according to claim 1, further comprising: Based on a plurality of tool exchange commands described in the machining program, a time required for execution from the first tool exchange command executed first to the second tool exchange command executed next is calculated. A tool change command time calculation unit,
When the execution of the machining program is started, an operating time calculation unit that calculates an elapsed time from the most recently executed tool change command to the current time,
Further equipped with,
The tool replacement time calculation unit,
The numerical control device according to claim 1, wherein the tool replacement time is calculated based on the required time and the elapsed time. The storage unit is
Furthermore, the standard tool replacement time is stored as a parameter,
The tool replacement time calculation unit,
If the tool replacement time is shorter than the standard tool replacement time, the first tool replacement having the required time longer than the standard tool replacement time based on the standard tool replacement time and the required time. Calculate the time to execute the command,
The display unit is
The numerical control device according to claim 4, wherein the time is displayed as a time suitable for tool replacement. An email sending unit for sending an email to the operator is further provided,
The numerical control device according to claim 5, wherein the operator is notified of the life tool and the time suitable for the tool replacement.

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