JP6881362B2 - Numerical control device - Google Patents

Description

The present invention relates to a numerical control device that measures the time required for machining a workpiece.

The numerical control device controls the operation of the machine tool based on the NC program. The numerical control device described in Patent Document 1 measures the execution time of the NC program and presents it as the cycle time required for machining the workpiece. The manager can manage the production using the machine tool in consideration of the cycle time.

Japanese Patent No. 4312047

However, when the machine tool is equipped with a door that opens and closes automatically, the numerical control device closes the door when the control of the machine tool is started, and then executes the NC program to process the workpiece. After machining, the numerical control device opens the door and ends the control of the machine tool. In Patent Document 1, since the execution time does not include the opening / closing time of the door, there is a problem that the actual time required for production is different from the estimated time based on the execution time.

An object of the present invention is to provide a numerical control device capable of presenting an execution time in consideration of an operating time of a machine tool.

According to one aspect of the present invention, in a numerical control device that controls the operation of a machine tool that processes a work based on an NC program, the execution time for measuring the execution time of the NC program as the time required for processing the work. The measuring means, the operating time measuring means for measuring the operating time, which is the non-execution time of the NC program, among the time between controlling the operation of the machine tool as the time required for driving the machine tool, and the operating time measuring means. When the storage unit includes a storage unit for storing the execution time and the operation time, and a display unit for displaying the execution time on the display unit, and the storage unit displays the execution time on the display unit in advance. When the display setting is set to include the operation time in the execution time, the display means calculates the total time obtained by totaling the execution time and the operation time. Numerical control characterized in that only the execution time is displayed on the display unit when the time is displayed on the display unit and the display setting is a setting for displaying the operation time without including the operation time in the execution time. Equipment is provided.

The time required for production using a machine tool is not only the execution time while machining the workpiece according to the NC program, but also the operation time while the NC program is not executing but controls the drive of the machine tool. It takes. The operating time is, for example, the time between opening and closing the door of the machine tool, the time between carrying in the work before machining and carrying out the workpiece after machining when the machine tool is incorporated into the production line, and the like. .. The numerical control device can display the total time of the execution time and the operation time on the display unit based on the display setting. Therefore, the manager can more accurately grasp the time required for production using the machine tool and can perform production control.

In the present embodiment, when the execution of the NC program is temporarily stopped, the execution time measuring means may set the execution time to a non-measured state. During machining of a workpiece according to an NC program, the numerical control device may temporarily stop the execution of the NC program, for example, when shifting to a manual data input (MDI) mode or when accepting a manual operation. In this case, the numerical control device can put the measurement of the execution time into a non-measurement state. That is, the numerical control device measures the execution time only when the workpiece is machined according to the execution of the NC program. Therefore, the manager can more accurately grasp the time required for production using the machine tool.

In the present embodiment, when the execution of the NC program is interrupted, the display means may display an identifier indicating that the machining on the work is interrupted on the display unit together with the execution time. When the machining of the workpiece is stopped in the middle, the numerical control device interrupts the execution of the NC program. In this case, since the numerical control device ends the control of the machine tool in the middle, not only the measurement of the execution time but also the measurement of the operation time ends in the middle. Therefore, the execution time and the operation time do not accurately represent the time required for production. In this case, the numerical control device can notify that the machining of the work is completed in the middle by displaying the identifier on the display unit together with the execution time.

In the present embodiment, the storage means stores a plurality of the execution time and the operation time for which measurement is completed in the storage unit, and the display means displays a list of the plurality of execution times in the display unit. You may. The numerical control device can store the history of the time required for machining the work in the storage unit and display it in a list. Therefore, the manager can check the history of the time required for production using the machine tool.

In the present embodiment, the storage means stores in the storage unit the execution time and the operation time for which the measurement is completed, and the execution time and the operation time for which the measurement is not completed due to the interruption of the execution of the NC program. You may. The numerical control device can store not only the history of the time required for machining the work but also the time when the machining of the work is stopped in the middle as a history in the storage unit. Therefore, the administrator can compare the history when the machining of the work is completed normally and the history when the machining of the work is stopped in the middle.

The present embodiment includes an operation time measuring means for measuring the operation time for operating the tool mounted on the spindle by the machine tool during the measurement of the execution time, and the display means displays the operation time together with the execution time. It may be displayed on the display unit. The numerical control device can display the time actually machined by the tool among the time required for machining the work as the operation time together with the execution time. Therefore, the manager can compare the operation time required for machining the workpiece with the tool with the execution time, and can perform production control.

In this embodiment, the machine tool can replace a plurality of the tools, and the operation time measuring means sets the operation time corresponding to the replaced tool each time the machine tool replaces the tool. You may measure. The numerical control device can acquire the operation time for each tool. Therefore, the manager can grasp the usage status of each tool.

It is a block diagram which shows the electrical structure of a numerical control device 20 and a machine tool 10. It is a flowchart of a main process. It is a flowchart (1/2) of the counting process during processing. It is a flowchart (2/2) of the counting process during processing. It is a flowchart of screen display processing. It is a flowchart of time display processing. It is a flowchart of a tool history display process. The individual history display screen 110. The tool history display screen 140. The history list display screen 170.

An embodiment of the present invention will be described. The numerical control device 20 shown in FIG. 1 controls the operation of the machine tool 10 to cut a work (work material) held on the upper surface of a table (not shown). The horizontal direction, the front-rear direction, and the vertical direction of the machine tool 10 are the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively.

For example, the machine tool 10 moves a tool mounted on a spindle extending in the Z-axis direction in the X-axis direction, the Y-axis direction, and the Z-axis direction with respect to a workpiece held on the upper surface of the table to perform machining (for example, drilling, tapping, etc.). It is a vertical machine tool that performs side machining, etc.). The machine tool 10 includes a spindle mechanism (not shown), a spindle moving mechanism, a tool changing device, and the like. The spindle mechanism includes a spindle motor 12 and rotates a spindle equipped with a tool. The spindle moving mechanism further includes a Z-axis motor 11, an X-axis motor 13, and a Y-axis motor 14, and the spindle is moved in the direction of each of the X, Y, and Z feed axes relative to the workpiece held on the upper surface of the table. Moving. The tool changing device includes a magazine motor 15 and drives a tool magazine (not shown) that stores a plurality of tools, and replaces a tool mounted on the spindle with another tool. The Z-axis motor 11, the spindle motor 12, the X-axis motor 13, the Y-axis motor 14, the magazine motor 15, and the door motor 16 (described later) are servo motors. In this embodiment, the Z-axis motor 11, the spindle motor 12, the X-axis motor 13, the Y-axis motor 14, the magazine motor 15, and the door motor 16 are collectively referred to as motors 11 to 16.

The protective cover (not shown) surrounds the machine tool 10 main body. The protective cover prevents chips and cutting fluid from scattering to the outside during various processes. The protective cover is provided with a door (not shown) and an operation panel 19 on the front surface. The door includes a door motor 16, an open switch 32, and a close switch 33. The door motor 16 slides the door in the left-right direction to open and close. By opening the door, the operator can replace the work fixed on the table in the protective cover. When the door is closed, the machining area and the outside are blocked, so that the operator can safely cut the workpiece. The open switch 32 and the close switch 33 are connected to the input / output unit 25 of the numerical control device 20. The open switch 32 is turned on when the door is in the open position. The close switch 33 is turned on when the door is in the closed position. The operation panel 19 is provided on the outer wall of the protective cover. The operation panel 19 is connected to the input / output unit 25 of the numerical control device 20. The operation panel 19 includes an input unit 17 and a display unit 18. The input unit 17 receives inputs such as various information and operation instructions and outputs them to the numerical control device 20. The display unit 18 displays various screens based on a command from the numerical control device 20.

The Z-axis motor 11 includes an encoder 11A. The spindle motor 12 includes an encoder 12A. The X-axis motor 13 includes an encoder 13A. The Y-axis motor 14 includes an encoder 14A. The magazine motor 15 includes an encoder 15A. The door motor 16 includes an encoder 16A. Each of the encoders 11A to 16A is connected to the drive circuits 26 to 31 of the numerical control device 20.

The numerical control device 20 includes a CPU 21, a ROM 22, a RAM 23, a storage device 24, an input / output unit 25, drive circuits 26 to 31, and the like. The CPU 21 controls the numerical control device 20 in an integrated manner. The ROM 22 stores various programs including a program for executing a main process (see FIG. 2), a screen display process (see FIG. 5), and the like, which will be described later. The RAM 23 stores various data during execution of various processes. The storage device 24 is a non-volatile memory. The storage device 24 stores, for example, an NC program for processing a work, various parameters, and the like. The input / output unit 25 is connected to the operation panel 19. The drive circuits 26 to 31 are servo amplifiers. The drive circuit 26 is connected to the Z-axis motor 11 and the encoder 11A. The drive circuit 27 is connected to the spindle motor 12 and the encoder 12A. The drive circuit 28 is connected to the X-axis motor 13 and the encoder 13A. The drive circuit 29 is connected to the Y-axis motor 14 and the encoder 14A. The drive circuit 30 is connected to the magazine motor 15 and the encoder 15A. The drive circuit 31 is connected to the door motor 16 and the encoder 16A.

The CPU 21 interprets an NC program for machining a workpiece, and drives a control command for moving each drive axis such as a feed axis (X axis, Y axis, Z axis), a spindle axis, and a magazine axis to a target position. Send to 26-30. The drive circuits 26 to 30 output drive currents (pulses) to the corresponding motors 11 to 15 in response to control commands (drive signals) received from the CPU 21. The drive circuits 26 to 30 receive feedback signals (position and speed signals) from the encoders 11A to 15A and control the position and speed of the motors 11 to 15. The drive circuits 26 to 30 are servo amplifiers that drive the servo motor, and may be configured by, for example, an FPGA circuit.

The main processing will be described with reference to FIGS. 2 to 4. The main process is a series of processes in which the machine tool 10 is driven to process the work, the time required for processing the work (cycle time, etc.) is measured, and the work is stored as a history. When the work is fixed to the table, the operator operates the input unit 17 of the operation panel 19 to select one NC program from a plurality of NC programs stored in the storage device 24, and the work based on the selected NC program. Instruct the start of processing. When the CPU 21 receives the machining start instruction from the input unit 17, the CPU 21 reads and executes the main processing program from the ROM 22.

As shown in FIG. 2, the CPU 21 performs initial settings of various counters, variables, and the like used in the main process (S1). The CPU 21 sets 0 for each of the open / close counter, the cycle time counter, the cutting time counter, the non-cutting time counter, the variable j, the variable k, the variable m, and the variable n. The open / close counter is a counter that measures the open / close time of the door. The cycle time counter is a counter that measures the machining time (cycle time) for machining a workpiece according to an NC program. Specifically, the cycle time counter measures the execution time of the NC program. The cutting time counter is a counter that measures the cutting time during which the machine tool 10 performs an operation of cutting a workpiece with a tool within the cycle time. The non-cutting time counter is a counter that measures the non-cutting time in which the machine tool 10 performs an operation other than the operation of cutting the workpiece with a tool within the cycle time.

The storage device 24 stores, for example, 20 cases of data such as cycle time measured in the main process as a history. The data included in the history includes the date and time, the program name, the opening / closing time, the cycle time, the cutting time, the non-cutting time, the tool ID which is the tool number, the number of tool changes, and the normal end flag. The storage device 24 sets the history number of the latest history to 1, and manages the storage area of each history by the history number in the order of storage. For convenience of explanation, each history and the storage area of individual data are indicated by adding a [history number]. For example, a history storage area having a history number of 5 is represented as history [5]. The date and time data storage area included in the history [5] is represented by the date and time [5]. A storage area for the tool ID, cutting time, and non-cutting time is provided every time the tool is replaced, and [history number, tool history number] is added and shown. The tool history number is set to 1 or more. The cutting time [history number, 0] is a storage area for storing the total time of cutting times of all tools. The non-cutting time [history number, 0] is a storage area for storing the total time of the non-cutting times of all tools. The CPU 21 adds 1 to the history number of each history and updates it (S2), deletes the history [21] whose history number becomes 21, and secures the history [1] (S3).

The CPU 21 drives the door motor 16 and moves the door toward the closed position (S11). The CPU 21 counts up the open / close time counter based on the clock signal from the timer (not shown) (S12). The CPU 21 continues to move the door and measure the opening / closing time while the closing switch 33 is OFF (S13: NO). When the closing switch 33 is turned on and the closing of the door is completed (S13: YES), the CPU 21 stops the door motor 16 and executes the NC program (S16).

The CPU 21 reads the NC program selected by the input unit 17 and interprets one line. The CPU 21 controls the operation of the machine tool 10 based on the interpreted control command in one line. When the interpreted command is an axis movement command, the CPU 21 drives the motors 11, 13 and 14 of the feed shaft to move the position of the main shaft relative to the table. Axis movement means an operation of moving the position of the main shaft. Due to the axial movement, the tool moves relative to the work. Axle movement includes fast-forward shaft movement and cutting feed shaft movement (cutting movement). The fast-forward shaft movement is an operation of moving the spindle at a speed faster than the cutting movement in order to approach or separate the tool from the work. The cutting movement is, for example, an axial movement for making a hole with a tap, a drill, or the like, and performing side surface machining with a milling cutter, an end mill, or the like. When the interpreted command is a tool change command, the CPU 21 drives the magazine motor 15 and moves the designated tool to the change position based on the feedback signal of the encoder 15A to change the tool. The CPU 21 repeatedly executes the counting process during machining until the execution of the NC program is completed (S16, S17, S18: NO).

As shown in FIGS. 3 and 4, in the machining counting process, the CPU 21 determines whether or not the axis is moving (S51). When the axis is not moving (S51: NO), the CPU 21 determines whether or not the tool is being replaced (S52). When the tool is not being replaced (S52: NO), the CPU 21 turns off the cutting flag (S61) and determines whether or not the interpreted control command is an axis movement command (S62). The cutting flag is a flag that turns ON during cutting movement. When the control command is not an axis movement command (S62: NO), the CPU 21 determines whether or not the interpreted control command is a tool change command (S71).

The tool change command also includes the initial tool designation. When the control command is a tool change command (S71: YES), the CPU 21 adds 1 to the variable j (S72). The CPU 21 stores the ID number of the tool specified by the tool change command in the tool ID [1, j] corresponding to the history [1] of the storage device 24 (S73). When the tool change command is the first tool designation, the CPU 21 stores the ID number in the tool ID [1,1] of the history [1]. When the variable j is 1 (S74: YES), the CPU 21 shifts the process to S81 because it is before the cutting time of the tool is measured.

The CPU 21 determines whether or not the NC program is being executed (S81). During execution of the NC program (S81: YES), the CPU 21 counts up the cycle time counter based on the clock signal of the timer in order to measure the cycle time (S82). The CPU 21 determines whether or not the cutting flag is ON (S83). When the cutting flag is OFF (S83: NO), the non-cutting time counter is counted up based on the clock signal of the timer in order to measure the non-cutting time for each tool (S85). The process returns to the main process.

While the tool is changed based on the tool change command (S51: NO, S52: YES), the CPU 21 counts up the cycle time and the non-cutting time (S81 to S85). When the tool change is completed, the CPU 21 interprets the next line of the NC program (S17). If the interpreted command is not an axis movement command (S62: NO) and is not a tool change command (S71: NO), the CPU 21 counts up the cycle time and non-cutting time and returns to the main process (S81). ~ S85).

When the interpreted command is an axis movement command (S62: YES), the CPU 21 determines whether or not the command is an axis movement command related to cutting movement (S63). When the axis movement command is not a cutting movement (S63: NO), the cutting flag is OFF, so the CPU 21 shifts the processing to S81, counts up the cycle time and the non-cutting time, and returns to the main processing. When the axis movement command is cutting movement (S63: YES), the CPU 21 turns on the cutting flag (S64) and shifts the process to S81. After counting up the cycle time (S81: YES, S82), the CPU 21 counts up the cutting time counter (S84) when the cutting flag is ON (S83: YES). The process returns to the main process.

While the spindle is moved based on the shaft movement command (S51: YES), the CPU 21 counts up the cycle time (S81, S82), and counts up the cutting time or the non-cutting time according to the cutting flag (S83 to S85). ). When the axis movement is completed, the CPU 21 interprets the next line of the NC program (S16). When the interpreted command is a tool change command (S62: NO, S71: YES), the CPU 21 adds 1 to the variable j (S72). The variable j is 2. The CPU 21 stores the ID number of the tool specified by the tool change command in the tool ID [1, j] of the history [1] (S73). Since the variable j is not 1 (S74: NO), the CPU 21 stores the cutting time in the cutting time [1, j-1] in the history [1] and does not cut in the non-cutting time [1, j-1]. Memorize the time (S75). Specifically, when the tool change command specifies the second tool, the CPU 21 stores the ID number of the second tool in the tool ID [1, 2], and one in the cutting time [1, 1]. The cutting time by the eye tool is memorized, and the non-cutting time by the first tool is memorized in the non-cutting time [1,1]. The CPU 21 sets 0 in the cutting time counter and the non-cutting time counter (S76), and shifts the processing to S81. The CPU 21 counts up the cycle time and the non-cutting time corresponding to the second tool (S81 to S85), and returns to the main process.

During execution of the NC program, the numerical control device 20 may shift to the MDI mode, for example, or may accept a manual operation. In this case, the CPU 21 suspends the execution of the NC program. In the determination of S81, when the NC program is not being executed (S81: NO), the CPU 21 determines whether or not the execution of the NC program is in the paused state (S91). If the execution of the NC program is in the paused state (S91: YES), the CPU 21 returns the process to the main process, does not measure the cycle time, and does not measure the cutting time or the non-cutting time.

As shown in FIG. 2, when the interpreted command is the end command (S18: YES), the CPU 21 stores the cutting time in the cutting time [1, j] of the history [1], and the non-cutting time [1, j]. ] Stores the non-cutting time (S21). Specifically, when the NC program ends after cutting with the second tool, the CPU 21 stores the cutting time with the second tool in the cutting time [1, 2], and the non-cutting time [1, 2] stores the non-cutting time by the second tool.

The CPU 21 drives the door motor 16 and moves the door toward the open position (S22). The CPU 21 counts up the open / close time counter based on the clock signal from the timer (not shown) (S23). The CPU 21 continues to move the door and measure the opening / closing time while the open switch 32 is OFF (S24: NO). When the open switch 32 is turned on and the door opening is completed (S24: YES), the CPU 21 stops the door motor 16. The CPU 21 stores 1 in the normal end flag [1] (S25).

The CPU 21 stores the measurement results of each time and various data in the history [1] of the storage device 24 (S31). The CPU 21 stores the date and time in the date and time [1], and stores the file name of the NC program in the program name [1]. The CPU 21 stores the measured value of the cycle time counter in the cycle time [1]. The CPU 21 stores the variable j in the number of tool changes [1]. The CPU 21 stores the measured value of the opening / closing time counter in the opening / closing time [1].

The CPU 21 adds 1 to the variable k (S32), adds the cutting time of the kth tool stored in the cutting time [1, k] to the variable m (S33), and does not cut the variable n. The non-cutting time of the k-th tool stored in the time [1, k] is added (S34). If the variable k is not the same value as the value stored in the tool change count [1], the CPU 21 returns the process to S32 (S35: NO), and sets the cutting time and non-cutting time of the next tool to the variable m and the variable n, respectively. Add to. If the variable k has the same value as the number of tool changes [1] (S35: YES), the CPU 21 stores the value of the variable m in the cutting time [1,0] and the variable n in the non-cutting time [1,0]. The value of (S36) is stored, and the main process is terminated.

The numerical control device 20 may receive an instruction to stop the execution of the NC program due to various circumstances. In the determination of S91, when the execution of the NC program is in the stopped state (S91: NO), the CPU 21 stores 0 in the normal end flag [1] (S92), and shifts to S31 of the main process. The CPU 21 stores each time and various data measured until the execution of the NC program is stopped in the history [1] (S31 to S36), and ends the main process.

The screen display process will be described with reference to FIGS. 5 to 10. The screen display process is a process of displaying the cycle time and the like on the display screen of the display unit 18. The operator operates the input unit 17 of the operation panel 19 and gives an instruction to display the cycle time or the like on the display screen. When the CPU 21 receives the instruction, the CPU 21 reads and executes the screen display processing program from the ROM 22. In the screen display process, the individual history display screen 110 (see FIG. 8), the tool history display screen 140 (see FIG. 9), and the history list display screen 170 (see FIG. 10) can be displayed on the display unit 18. The individual history display screen 110 is a screen for displaying details such as cycle time. The tool history display screen 140 is a screen added to the individual history display screen 110 to display the cutting time and the non-cutting time for each tool. The history list display screen 170 is a screen for displaying a list of histories such as cycle times of up to 20 items stored in the storage device 24.

As shown in FIG. 5, the CPU 21 makes initial settings and sets 1 to the variable i used in the screen display process (S101). The CPU 21 displays the individual history display screen 110 on the display screen of the display unit 18 (S102). As shown in FIG. 8, the individual history display screen 110 has display fields 111 to 117 for displaying various data. The display columns 111 to 114 and 117 are display columns for the program name, cycle time, cutting time, non-cutting time, date and time, respectively. The display column 116 is a display column for the hourly operation rate. The hourly operation rate is the calculation result of cutting time / cycle time expressed as a percentage. The individual history display screen 110 includes a history display end button 121, a tool history display button 122, a history list display button 123, and a history deletion button 129 at the bottom.

As shown in FIG. 5, the CPU 21 determines whether or not the all-time display setting is ON (S103). The full time display setting is a parameter for setting whether the cycle time is the execution time of the NC program or the total drive time of the machine tool 10 including the opening / closing time of the door. The numerical control device 20 stores the full-time display setting in the storage device 24 in advance as an initial setting. When the all-time display setting is OFF (S103: NO), the CPU 21 advances the process to S105. When the all-time display setting is ON (S103: YES), the CPU 21 displays a description (see FIG. 8, arrow A) that “including the door opening / closing time” in the cycle time display field 112 (S104). The process proceeds to S105.

The CPU 21 executes the time display process (S105). As shown in FIG. 6, the CPU 21 reads each data stored in the history [i] from the storage device 24 (S151). The CPU 21 displays each data stored in the program name [i], the cutting time [i, 0], the non-cutting time [i, 0], and the date and time [i] in the display fields 111, 113, 114, and 117, respectively. (S152). When the all-time display setting is OFF (S153: NO), the CPU 21 displays the cycle time stored in the cycle time [i] in the display field 112 (S154). When the all-time display setting is ON (S153: YES), the CPU 21 adds up the cycle time stored in the cycle time [i] and the opening / closing time stored in the opening / closing time [i] and displays them in the display field 112. (S155).

The CPU 21 determines whether or not the screen displayed on the display unit 18 is the individual history display screen 110 (S161), and if it is not the individual history display screen 110 (S161: NO), the process proceeds to S171. When the individual history display screen 110 is displayed (S161: YES), the CPU 21 determines whether or not the all-time display setting is ON (S162). When the all-time display setting is OFF (S162: NO), the CPU 21 obtains the percentage obtained by dividing the value of the cutting time [i, 0] by the value of the cycle time [i] as the hourly operation rate, and displays it in the display column 116. (S163). When the all-time display setting is ON (S162: YES), the CPU 21 divides the value of the cutting time [i, 0] by the value obtained by adding the opening / closing time [i] to the cycle time [i], and divides the percentage by the hourly operating rate. And display it in the display field 116 (S164).

The CPU 21 determines whether or not the normal end flag [i] is 1 (S171). When the normal end flag [i] is 1 (S171: YES), the CPU 21 displays the opening / closing time stored in the opening / closing time [i] in the opening / closing time display field 115 (S172), and returns to the screen display process. When the normal end flag [i] is 0 (S171: NO), the CPU 21 displays an “*” mark (see FIG. 8, arrow B) on the side of the cycle time in the cycle time display field 112 (S173). .. The operator can recognize that the data displayed on the individual history display screen 110 is the data when the execution of the NC program is stopped due to various reasons. Further, the CPU 21 does not accurately measure the opening / closing time of the door because the execution of the NC program is stopped. Therefore, the CPU 21 displays “−” (see FIG. 8, arrow C) as the opening / closing time in the opening / closing time display field 115 (S174), and returns to the screen display process.

The CPU 21 waits for input of an operation for each button of the individual history display screen 110 (S111: NO, S112: NO, S114: NO, S116: NO). When the operation of the history deletion button 129 is accepted (S114: YES), the CPU 21 deletes the history [i] (S115). When the operation of the tool history display button 122 is accepted (S112: YES), the CPU 21 executes the tool history display process (S113).

As shown in FIG. 7, the CPU 21 displays the tool history display screen 140 on the display screen of the display unit 18 (S181). As shown in FIG. 9, the tool history display screen 140 is a screen in which the tool history list 150 is additionally displayed in the empty space of the individual history display screen 110. The tool history list 150 has display columns 151 to 153. The display columns 151 to 153 are display columns for the tool ID, the cutting time, and the non-cutting time, respectively. Each row of the tool history list 150 is provided for each tool history, and the tool ID, cutting time, and non-cutting time are displayed at the respective display positions corresponding to the display columns 151 to 153. The tool history display screen 140 includes a back button 161, a tool order button 162 used, and a tool number order button 163 at the bottom.

As shown in FIG. 7, the CPU 21 sets the variable k to 0 (S182) and adds 1 to the variable k (S183). The CPU 21 reads each data of the tool ID [i, k], the cutting time [i, k], and the non-cutting time [i, k] stored in the history [i] from the storage device 24 (S184). The CPU 21 inputs each data of the tool ID [i, k], the cutting time [i, k], and the non-cutting time [i, k] to each of the display columns 151 to 153 in the kth row of the tool history list 150. Display (S185). If the variable k is not the same value as the value stored in the tool change count [i], the CPU 21 returns the process to S183 (S186: NO), reads each data of the next tool, and displays it on the next line.

If the variable k has the same value as the number of tool changes [i] (S186: YES), the CPU 21 waits for input of an operation for each button on the tool history display screen 140 (S191: NO, S193: NO). When the operation of the tool order button 162 or the tool number order button 163 is accepted (S191: YES), the CPU 21 performs a process of rearranging the display of the tool history list 150 (S192). When the operation of the tool order button 162 is accepted, the CPU 21 performs the same processing as in S183 to S186, and each of the tool ID [i, k], the cutting time [i, k], and the non-cutting time [i, k]. Display data in historical order. When the operation of the tool number order button 163 is accepted, the CPU 21 sorts and displays each line in ascending or descending order of the tool ID. At this time, if there is data of the same tool ID, the CPU 21 may calculate and display the total value of each of the cutting time and the non-cutting time. When the operation of the back button 161 is accepted (S193: YES), the CPU 21 erases the display of the tool history list 150 (S194) and returns to the state where the individual history display screen 110 is displayed on the display screen of the display unit 18. Return to the screen display process.

As shown in FIG. 5, the CPU 21 waits for input of an operation for each button of the individual history display screen 110 (S111 to S116). When the operation of the history list display button 123 is accepted (S111: YES), the CPU 21 displays the history list display screen 170 on the display screen of the display unit 18 (S121). As shown in FIG. 10, the history list display screen 170 is a screen displaying the history list 180. The history list 180 has display columns 181-186. The display columns 181 to 186 are display columns for the date and time, the program name, the cycle time, the cutting time, the non-cutting time, and the opening / closing time, respectively. Each row of the history list 180 displays each data stored in the history [1] to the history [20] of the storage device 24 at each display position corresponding to the display columns 181 to 186. The history list display screen 170 includes a history display end button 191, a selection history display button 192, a selection history deletion button 198, and a total history deletion button 199 at the bottom.

As shown in FIG. 5, the CPU 21 determines whether or not the all-time display setting is ON (S122). When the all-time display setting is OFF (S122: NO), the CPU 21 advances the process to S124. When the all-time display setting is ON (S122: YES), the CPU 21 displays a description (see FIG. 10, arrow D) that “including the door opening / closing time” in the cycle time display column 183 (S123). The process proceeds to S124.

The CPU 21 sets the variable i to 1 (S124). If the storage device 24 stores data in the history [i] (S125: YES), the CPU 21 executes the time display process (S126). As shown in FIG. 6, the CPU 21 has a program name [i], a cutting time [i, 0], and a non-cutting time [i], respectively, in the display columns 182, 184, 185, and 181 of the i-th row in the history list 180. Each data of i, 0] and the date and time [i] is displayed (S152). The CPU 21 displays the cycle time [i] (S154) or the total value (S155) of the cycle time [i] and the opening / closing time [i] in the display column 183 according to the all-time display setting. The hourly operation rate is not displayed in the history list 180 (S161: NO). If the normal end flag [i] is 1, the CPU 21 displays the opening / closing time [i] in the display column 186 (S172), and returns to the screen display process. If the normal end flag [i] is 0, the CPU 21 displays an “*” mark (see FIG. 10, arrow E) in the display column 183 (S173), and “-” (FIG. 10, arrow E) in the display column 186. (Refer to F) is displayed (S174), and the process returns to the screen display process.

As shown in FIG. 5, the CPU 21 adds 1 to the variable i (S127), returns the process to S125 if the variable i is not 21 (S128: NO), and reads each data of the next history [i]. Then display it on the next line. When the history [i] is deleted (S125: NO), the CPU 21 does not execute the time display process, and further reads each data of the next history [i] and displays it on the next line. When each data of the history [1] to [20] is displayed in the history list table 180 and the variable i becomes 21 (S128: YES), the CPU 21 operates the operation for each button of the history list display screen 170. Wait for input (S131: NO, S133: NO, S135: NO).

When the operation of the selection history deletion button 198 or the all history deletion button 199 is accepted (S133: YES), the CPU 21 performs a process of deleting the history storage area (S134). Based on the operation of the input unit 17, the CPU 21 can accept the selection of one of the 20 histories displayed in the history list 180. When the operation of the selection history deletion button 198 is accepted, the CPU 21 deletes the storage area corresponding to the history number of the history for which the selection has been accepted. When the operation of the all history deletion button 199 is accepted, the CPU 21 deletes all of the history [1] to the history [20].

When the operation of the selection history display button 192 is accepted (S131: YES), the CPU 21 sets the history number of the history for which the selection has been accepted in the variable i (S132), and shifts the process to S102. The CPU 21 displays the individual history display screen 110 and the history data for which the selection has been accepted on the display screen of the display unit 18 (S102 to S105), and waits for the input of the operation for each button (S111 to S116). When the operation of the history display end button 121 is accepted (S116: YES), the CPU 21 ends the screen display process. Further, when the history list display 180 is displayed on the history list display screen 170, the CPU 21 also ends the screen display process when the operation of the history display end button 191 is accepted (S135: YES).

As described above, the time required for production using the machine tool 10 controls not only the cycle time during machining of the workpiece according to the NC program, but also the drive of the machine tool 10 even though the NC program is not being executed. It also takes time to operate while doing so. The operating time is, for example, the opening / closing time for opening / closing the door of the machine tool 10, the time between carrying in the work before machining and carrying out the work after machining when the machine tool 10 is incorporated in the production line, and the like. is there. The numerical control device 20 can display the total time of the cycle time and the operation time on the display screen of the display unit 18 based on the all-time display setting. Therefore, the manager can more accurately grasp the time required for production using the machine tool 10 and can perform production control.

During machining of a workpiece according to the NC program, for example, when shifting to the MDI mode or when accepting a manual operation, the numerical control device 20 may temporarily stop the execution of the NC program. In this case, the numerical control device 20 can put the cycle time measurement in a paused state without updating the cycle time counter. That is, the numerical control device 20 measures the cycle time only when the workpiece is machined according to the execution of the NC program. Therefore, the manager can more accurately grasp the time required for production using the machine tool 10.

When the machining of the work is stopped in the middle, the numerical control device 20 interrupts the execution of the NC program. In this case, since the numerical control device 20 ends the control of the machine tool 10 in the middle, not only the measurement of the cycle time but also the measurement of the operation time ends in the middle. Therefore, the cycle time and the operating time do not accurately represent the time required for production. In this case, the numerical control device 20 can notify that the machining of the work is completed in the middle by displaying the “*” mark together with the cycle time on the display screen of the display unit 18.

The numerical control device 20 stores the history of the time required for machining the work in the storage device 24, and can display the list on the history list display screen 170. Therefore, the manager can confirm the history of the time required for production using the machine tool 10.

The numerical control device 20 can store not only the history of the time required for machining the work but also the time when the machining of the work is stopped in the middle as a history in the storage device 24. Therefore, the administrator can compare the history when the machining of the work is completed normally and the history when the machining of the work is stopped in the middle.

The numerical control device 20 can display the time actually machined by the tool among the time required for machining the work as the cutting time together with the cycle time. Therefore, the manager can compare the cutting time required for machining the workpiece with the tool with the cycle time, and can perform production control.

Since the numerical control device 20 can acquire the cutting time for each tool, the manager can grasp the usage status of each tool.

In the above description, the cycle time corresponds to the "execution time" of the present invention. The CPU 21 that executes S82 corresponds to the "execution time measuring means" of the present invention. The opening / closing time corresponds to the "operating time" of the present invention. The CPU 21 that executes S12 and S23 corresponds to the "operating time measuring means" of the present invention. The storage device 24 corresponds to the "storage unit" of the present invention. The CPU 21 that executes S31 corresponds to the "storage means" of the present invention. The CPU 21 that executes S105 corresponds to the "display means" of the present invention. The full-time display setting corresponds to the "display setting" of the present invention. The * mark corresponds to the "identifier" of the present invention. The cutting time corresponds to the "operation time" of the present invention. The CPU 21 that executes S84 corresponds to the "operation time measuring means" of the present invention.

Needless to say, the present invention is not limited to the above embodiment and can be modified in various ways. The machine tool 10 of the above embodiment is a vertical machine tool whose spindle extends in the Z-axis direction, but may be a horizontal machine tool whose spindle extends in the horizontal direction. In this embodiment, instead of the CPU 21, a microcomputer, an ASIC (Application Specific Integrated Circuits), an FPGA (Field Programmable Gate Array), or the like may be used as a processor. The ROM 22 and the storage device 24 for storing the program may be composed of other non-temporary storage media such as an HDD. The non-temporary storage medium may be any storage medium capable of storing information regardless of the period for storing the information. The non-temporary storage medium may not include a temporary storage medium (eg, a signal to be transmitted). Various programs and parameters such as NC programs may be downloaded from a server connected to a network (not shown) and stored in a storage device such as a flash memory. In this case, the program may be stored in a non-temporary storage medium such as an HDD provided in the server.

In the time display process, the CPU 21 displays the total value of the cycle time [i] and the opening / closing time [i] or the cycle time [i] at the cycle time display position according to the all-time display setting (parameter). Not limited to this, the individual history display screen 110 may be provided with, for example, a display switching button. In this case, the CPU 21 may display the total value of the cycle time [i] and the opening / closing time [i] or the cycle time [i] at the display position of the cycle time according to the operation of the display switching button.

The time that can be displayed by including it in the cycle time is not limited to the opening / closing time of the door. For example, in the case where a transfer device is connected to the machine tool 10 to carry in and out before and after machining the work, the CPU 21 can measure the transfer time of the work and display the cycle time including the transfer time. May be good.

Since the door motor 16 for opening and closing the door is driven at a constant speed, the time required for opening and closing the door is constant. Therefore, the numerical control device 20 may have a configuration in which the opening / closing time is not measured by using a predetermined value in which the time required for opening the door and the time required for closing the door are measured in advance in the main process. Further, the numerical control device 20 may control the opening and closing of the door at a lower speed than the next time and thereafter at the first opening and closing after the power is turned on. In this case, the numerical control device 20 may prepare predetermined values obtained by previously measuring the time required for opening and closing the door at a low speed and the time required for opening and closing the door at a high speed, and use them in the main process.

The numerical control device 20 stores the full-time display setting in the storage device 24 in advance as an initial setting, but the present invention is not limited to this. The numerical control device 20 "opens and closes the door" when, for example, a specific additional character (for example, "D" is added to the end of the file name, "_PRODUCT" is added, etc.) is added to the file name of the NC program. It may be set to "include time".

In the time display process, even if the normal end flag [i] is 1, if the all-time display setting is OFF, the CPU 21 does not have to display the open / close time [i]. When the machine tool 10 is provided with a transfer device such as a loader or a pallet changer, the numerical control device 20 may store the identification number of the transfer device and the like in the history [i]. The number of records that can be stored in the history is not limited to 20, and can be changed as appropriate. The number of items that can be stored in the tool history may be set as appropriate.

10 Machine tool 18 Display 20 Numerical control device 21 CPU
24 storage device

Claims (7)

In a numerical control device that controls the operation of a machine tool that processes a workpiece based on an NC program
As the time required to process the work, an execution time measuring means for measuring the execution time of the NC program and an execution time measuring means.
As the time required to drive the machine tool, the operation time measuring means for measuring the operation time, which is the non-execution time of the NC program, among the time during controlling the operation of the machine tool, and the operation time measuring means.
A storage means for storing the execution time and the operation time in a storage unit,
The display unit is provided with a display means for displaying the execution time.
The storage unit stores in advance display settings for displaying the execution time on the display unit.
The display means
When the display setting is a setting for displaying the execution time including the operation time, the total time obtained by adding the execution time and the operation time is displayed on the display unit as the execution time.
When the display setting is a setting for displaying the execution time without including the operation time, the numerical control device is characterized in that only the execution time is displayed on the display unit. The numerical control device according to claim 1, wherein when the execution of the NC program is temporarily stopped, the execution time measuring means puts the execution time into a non-measured state. The first or second aspect of the present invention, wherein when the execution of the NC program is interrupted, the display means displays an identifier indicating that the machining on the work is interrupted on the display unit together with the execution time. Numerical control device. The storage means stores a plurality of the execution time and the operation time for which the measurement is completed in the storage unit.
The numerical control device according to any one of claims 1 to 3, wherein the display means displays a plurality of execution times in a list on the display unit. The storage means is characterized in that, together with the execution time and the operation time for which the measurement is completed, the execution time and the operation time for which the measurement is not completed due to the interruption of the execution of the NC program are stored in the storage unit. The numerical control device according to claim 4. An operation time measuring means for measuring the operation time for operating the tool mounted on the spindle by the machine tool during the measurement of the execution time is provided.
The numerical control device according to any one of claims 1 to 5, wherein the display means displays the operation time on the display unit together with the execution time. The machine tool is capable of exchanging a plurality of the tools.
The numerical control device according to claim 6, wherein the operation time measuring means measures the operation time corresponding to the tool after the replacement each time the machine tool replaces the tool.

Images