JP7119858B2 - Tool life management device, machine tool, display processing method and computer program - Google Patents

Description

The present technology relates to a tool life management device, a machine tool, a display processing method, and a computer program that measure and report the life of a tool.

2. Description of the Related Art Conventionally, there has been proposed a tool life management device that measures the life of a tool according to the usage time of the tool, the number of holes formed in the work, and the number of machinable works. A tool life management device can display the remaining life of a tool on a display device by a user's operation (see, for example, Patent Document 1).

JP-A-5-305552

However, since the remaining life is displayed in different units (hours of use, number of holes, and number of workpieces) for each tool, when a plurality of tools are compared in different units, it is difficult to understand the length of the remaining life.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a tool life management device and a machine tool in which the length of the remaining life of a tool can be easily understood even if the lives of a plurality of tools are managed in different units. With the goal.

A tool life management device according to the present invention includes a setting unit that selects one of a plurality of units for indicating tool life and sets a tool life value for each tool based on the selected unit. , an updating unit that updates a value according to the current frequency of use of the tool each time the tool is used; and a position determination unit that determines the position where the life information of each tool is displayed on the display unit based on the ratio calculated by the calculation unit.

In the present invention, for example, a value obtained by subtracting a value corresponding to the frequency of use of the tool from the life value, that is, a remaining life value is calculated, and a ratio of the remaining life value to the life value is calculated. By using the above ratio, the units are unified, and it becomes easy to understand the long and short remaining lives of tools with different units. Also, based on the ratio, the position for displaying the life information of each tool is determined, and for example, the life information is displayed in descending order of the ratio. A worker can easily recognize a tool with a short remaining life.

In the tool life management device according to the present invention, the plurality of units include the tool usage time, the number of holes formed in the workpiece, and the number of executions of a machining program for machining the workpiece, and correspond to the machining program. A creation unit that updates and creates a history table that stores the usage time and the number of holes to be formed in the work each time the work is processed; a conversion unit that converts the number of executable times of the machining program based on the history table created by the creation unit; and tool life information on the display unit based on the executable number of times converted by the conversion unit and a second position determination unit that determines the display position.

In the present invention, when the usage time of the tool or the number of holes formed in the work is selected as the unit indicating the life of the tool, the remaining life value of the tool for which the usage time or the number of holes is selected can be executed by the machining program. Convert to number of times. A position for displaying the life information of each tool is determined based on the converted executable number of times. For example, the tool life information is displayed in descending order of the number of times the machining program can be executed. When the same machining program is continuously executed, a display based on the number of executable times is often easier for the operator to understand the remaining time than a display based on the usage time or the number of holes. In addition, the operator can immediately replace the tool for which the executable count has become 0 at the end of the machining program.

The tool life management device according to the present invention displays the tool life information at the position determined by the position determination unit, or displays the tool life information at the position determined by the second position determination unit. A receiving unit for receiving a selection is provided.

In the present invention, the operator can display tool life information based on the ratio or based on the executable number of times as required.

A tool life management device according to the present invention includes: a second reception unit that receives selection of a machining program for machining a workpiece; and a reading unit for reading out an identifier for identifying the tool from the program, and the life information of the tool is displayed on the display unit in association with the identifier read by the reading unit.

In the present invention, an identifier for identifying a tool is read from a machining program, and life information of the tool is displayed in association with the read identifier. For example, when a machining program is first executed and the tool life information is displayed, the machining program can be read out and the tool life information displayed even if the information on the tool to be used is not stored in advance in the storage unit. can be done.

The tool life management device according to the present invention includes a threshold setting unit that sets a threshold value related to tool life in association with each tool, and compares the threshold set by the threshold setting unit with the value updated by the updating unit. and a color determination unit that determines the color of the life information to be displayed on the display unit based on the comparison result.

In the present invention, the threshold value is compared with the value after subtraction by the subtractor, that is, the remaining life value, and the color of the life information to be displayed on the display is determined. For example, by changing the color of the life information according to the length of the remaining life, the operator can intuitively recognize the length of the remaining life of each tool.

A machine tool according to the present invention includes a spindle head, a tool changer, and any one of the tool life management devices described above.

In the present invention, for example, a value obtained by subtracting a value corresponding to the frequency of use of the tool from the life value, that is, a remaining life value is calculated, and a ratio of the remaining life value to the life value is calculated. By using the above ratio, the units are unified, and it becomes easy to understand the long and short remaining lives of tools with different units. Also, based on the ratio, the position for displaying the life information of each tool is determined, and for example, the life information is displayed in descending order of the ratio. A worker can easily recognize a tool with a short remaining life.

A display processing method according to the present invention selects one of a plurality of units for indicating tool life, sets the tool life value for each tool based on the selected unit, and sets the tool life value for each tool. Each time, the value corresponding to the current frequency of use of the tool is updated, the ratio of the updated value corresponding to the current frequency of use of the tool to the set life value is calculated, and based on the calculated ratio, the display unit Decide where to display the life information for each tool.

In the present invention, for example, a value obtained by subtracting a value corresponding to the frequency of use of the tool from the life value, that is, a remaining life value is calculated, and a ratio of the remaining life value to the life value is calculated. By using the above ratio, the units are unified, and it becomes easy to understand the long and short remaining lives of tools with different units. Also, based on the ratio, the position for displaying the life information of each tool is determined, and for example, the life information is displayed in descending order of the ratio. A worker can easily recognize a tool with a short remaining life.

In the display processing method according to the present invention, the plurality of units include the tool usage time, the number of holes formed in the workpiece, and the number of executions of a machining program for machining the workpiece, and correspond to the machining program, and the tool usage A history table that stores the time and the number of holes to be formed in the work is updated each time the work is machined and created, and if the usage time or the number of holes is selected, the updated value according to the current frequency of use of the tool. is converted into the executable number of times of the machining program based on the created history table, and the position for displaying the tool life information on the display section is determined based on the converted executable number of times.

In the present invention, when the usage time of the tool or the number of holes formed in the work is selected as the unit indicating the life of the tool, the remaining life value of the tool for which the usage time or the number of holes is selected can be executed by the machining program. Convert to number of times. A position for displaying the life information of each tool is determined based on the converted executable number of times. For example, the tool life information is displayed in descending order of the number of times the machining program can be executed. When the same machining program is continuously executed, a display based on the number of executable times is often easier for the operator to understand the remaining time than a display based on the usage time or the number of holes. In addition, the operator can immediately replace the tool for which the executable count has become 0 at the end of the machining program.

A computer program according to the present invention selects one unit from a plurality of units for indicating tool life, sets a tool life value for each tool based on the selected unit, and uses the tool. Each time, the value corresponding to the current frequency of use of the tool is updated, the ratio of the updated value corresponding to the current frequency of use of the tool to the set life value is calculated, and based on the calculated ratio, each Execute the process of determining the position where the tool life information is displayed.

In the present invention, for example, a value obtained by subtracting a value corresponding to the frequency of use of the tool from the life value, that is, a remaining life value is calculated, and a ratio of the remaining life value to the life value is calculated. By using the above ratio, the units are unified, and it becomes easy to understand the long and short remaining lives of tools with different units. Also, based on the ratio, the position for displaying the life information of each tool is determined, and for example, the life information is displayed in descending order of the ratio. A worker can easily recognize a tool with a short remaining life.

In the computer program according to the present invention, the plurality of units include the tool usage time, the number of holes to be formed in the workpiece, and the number of executions of a machining program for machining the workpiece, corresponding to the machining program, and the tool usage time and a history table that stores the number of holes to be formed in the work is updated each time the work is machined and created, and when the usage time or the number of holes is selected, the updated value according to the current tool usage frequency Then, based on the created history table, the machining program is converted into the executable number of times, and based on the converted executable number of times, a process of determining a position for displaying the tool life information on the display unit is executed.

In the present invention, when the usage time of the tool or the number of holes formed in the work is selected as the unit indicating the life of the tool, the remaining life value of the tool for which the usage time or the number of holes is selected can be executed by the machining program. Convert to number of times. A position for displaying the life information of each tool is determined based on the converted executable number of times. For example, the tool life information is displayed in descending order of the number of times the machining program can be executed. When the same machining program is continuously executed, a display based on the number of executable times is often easier for the operator to understand the remaining time than a display based on the usage time or the number of holes. In addition, the operator can immediately replace the tool for which the executable count has become 0 at the end of the machining program.

In the tool life management device, machine tool, display processing method, and computer program according to the present disclosure, a value obtained by subtracting a value corresponding to the frequency of use of the tool from the life value, that is, a remaining life value is calculated, and Calculate the ratio of the remaining life value. By using the above ratio, the units are unified, and it becomes easy to understand the long and short remaining lives of tools with different units.

1 is a schematic perspective view of a machine tool according to Embodiment 1; FIG. It is a perspective view which shows the cover for machine tools briefly. It is a block diagram of a control device. 4 is a conceptual diagram showing an example of a machining program; FIG. FIG. 4 is a conceptual diagram showing an example of a tool-in-use table that stores information about the life of tools used in machining; FIG. 4 is a conceptual diagram showing an example of a history table storing machining time and the number of holes made for each tool; It is an example of a display section that displays information about the life of each tool. FIG. 8 is an example of a display section displaying information about the life of each tool after executing the machining program ten times from the state of FIG. 7 ; FIG. It is a flow chart explaining tool life display processing by a control device. 4 is a flowchart for explaining lifespan display processing by a control device; It is a flow chart explaining processing during operation by a control device. FIG. 10 is an example of a display section in which the remaining life value is converted into the executable number of times of the machining program, and information on the life of each tool is displayed based on the converted executable number in Embodiment 2. FIG. It is a flow chart explaining tool life display processing by a control device. It is a flow chart explaining conversion display processing by a control device. It is a flow chart explaining processing during operation by a control device. It is an example of a display section displaying information about the life of each tool, in which remaining life values are displayed instead of current values.

(Embodiment 1)
The present invention will be described below with reference to drawings showing a machine tool according to Embodiment 1. FIG. In the following description, up, down, front, back, left, and right shown in the drawings are used. FIG. 1 is a schematic perspective view of a machine tool 100. FIG. The machine tool 100 comprises a machine body comprising a base 20, a fixed table 21, a Y-direction moving device 22, an X-direction moving device 26, a column 28, a Z-direction moving device 30, a spindle head 32, and a tool changer 10. , a spindle motor 35 and the like. The base 20 is fixed on the floor surface. A workpiece holding portion 120 is provided in front of the fixed table 21 . The fixed base 21 has a rectangular box shape elongated in the front-rear direction and is provided on the base 20 . The fixed base 21 fixes the Y-direction moving device 22 . The Y-direction moving device 22 includes a Y-direction drive motor (not shown) and a ball screw mechanism (not shown) driven by the Y-direction drive motor.

An X-direction moving device 26 is provided in the ball screw mechanism of the Y-direction moving device 22 . The X-direction moving device 26 includes an X-direction drive motor (not shown) and a ball screw mechanism (not shown) driven by the X-direction drive motor. A column 28 is provided in the ball screw mechanism of the X-direction moving device 26 . The X-direction moving device 26 and the Y-direction moving device 22 support the column 28 so as to be movable in the X direction (horizontal direction) and the Y direction (front and rear direction).

A Z-direction moving device 30 is provided on the front face of the column 28 . The Z-direction moving device 30 includes a Z-direction drive motor (not shown) and a ball screw mechanism (not shown) driven by the Z-direction drive motor. A spindle head 32 is provided on the Z-direction moving device 30 . The column 28 supports a spindle head 32 movably in the Z direction (vertical direction) via a Z-direction moving device 30 . A spindle motor 35 is provided above the spindle head 32 . The spindle head 32 supports a spindle (not shown) whose axial direction is up and down. A spindle motor 35 rotates the spindle about its axis. A tool changer 10 changes a tool attached to a spindle.

FIG. 2 is a perspective view schematically showing the machine tool cover 1. FIG. As shown in FIG. 2, the machine tool 100 includes a machine tool cover 1 surrounding the machine body. A machine tool cover 1 is provided on the upper side of a base 20 . The machine tool cover 1 extends vertically and includes a rectangular front wall 5 , left wall 6 , right wall 7 and rear wall 8 covering the front, rear, left and right sides of the machine body of the machine tool 100 . A rectangular ceiling 9 that covers the upper side of the machine tool 100 and is parallel to the left-right direction and the front-rear direction is provided. A vertically long rectangular opening 51 is provided in the central portion of the front wall 5, and an operation panel 54 for the operator to input commands is provided on the right side of the opening 51. As shown in FIG. A display unit 55 is provided on the upper side of the operation panel 54 . A vertically long rectangular right door 52 and left door 53 are arranged side by side in the opening 51 so as to be movable in the horizontal direction.

FIG. 3 is a block diagram of the control device 80. As shown in FIG. The rear wall 8 is provided with a control device 80 having a control board for controlling the operation of the machine tool 100 and an amplifier for adjusting power supplied to the motor. The control device 80 includes a CPU 80a, a RAM 80b, a storage section 80c, and the like. The storage unit 80c is, for example, a nonvolatile memory or hard disk. The CPU 80 a reads the control program stored in the storage unit 80 c to the RAM 80 b and controls the machine tool 100 . The CPU 80a has a timer function. The control device 80 inputs an operation signal from the operation panel 54 and outputs a signal for displaying information on the display section 55 . The display unit 55 displays information. A logic circuit such as an FPGA may be used instead of the CPU 80a.

FIG. 4 is a conceptual diagram showing an example of a machining program. As shown in FIG. 4, the "number" column indicates the line number, and the "instruction" column indicates the process to be executed. The storage unit 80c stores a machining program for machining a workpiece. A machining program comprises a plurality of lines (instructions). The CPU 61 reads the lines in order and executes the instructions. G100 on the N1 line indicates a tool change command, and T1 indicates the number of the tool to be mounted next on the spindle. X-60 indicates the horizontal standby position of the spindle after tool replacement, Y-20 indicates the longitudinal standby position of the spindle after tool replacement, and Z20 indicates the vertical standby position of the spindle after tool replacement.

The numerical values after X, Y, and Z indicate positions when the origin of processing is 0, and the unit is mm. G83 on the N2 line indicates a drilling command, S25000 indicates the target rotational speed of the main shaft of 25000 rpm, and Z-5 indicates the vertical reach position in drilling. The spindle rotates forward, moves from the standby position to the vertical reaching position for drilling, and drills the workpiece to form a hole in the workpiece. M30 on the Nnth line indicates a machining program end command. Although not shown, G1 indicates a cutting movement command.

FIG. 5 is a conceptual diagram showing an example of a tool-in-use table that stores information on the life of tools used in machining. The storage unit 80c stores a used tool table. The used tool table stores the tool number of the tool, the unit used for measuring the life, the end value of the life, the advance notice value, and the current value of the life. The unit is, for example, the number of holes to be formed in the workpiece, the usage time of the tool, or the number of executions of the machining program.

The operator operates the operation panel 54 before executing the machining program, and inputs the unit corresponding to the tool number, the end value, and the notice value to the control device 80 . For example, the number of holes is input for each tool with tool number 1 (hereinafter, tools with tool numbers N (N=1, 2, 3, . . . ) are also simply referred to as tool N). The operator selects units based on the type of tool. Also, 4000 is input as the end value, and 3800 is input as the notice value. The end value indicates the number at which the tool life ends. The advance notice value is a threshold for indicating that the time to replace the tool is approaching.

An operator operates the operation panel 54 to select a predetermined machining program. When manufacturing a large quantity of the same product, the operator repeats execution of the machining program. The control device 80 executes the machining program, adds the number of formed holes to the current value each time the tool 1 forms a hole, and sequentially updates the current value.

The control device 80 displays information about the life of each tool on the display section 55 during execution of the machining program. If the difference between the end value of the tool and the current value, that is, the remaining life value is greater than the double value of the difference between the end value and the advance notice value, the information on the tool life is displayed in green. For example, in the case of tool 1, the difference between the end value and the advance notice value is 200, so if the current value is 3600 or less, the information regarding the life of tool 1 is displayed in green.

If the difference between the end value of the tool and the current value is less than twice the difference between the end value and the warning value and greater than the difference between the end value and the warning value, information about the tool life is displayed in yellow. do. For example, in the case of tool 1, if the current value is 3601 to 3800, information regarding the life of tool 1 is displayed in yellow.

If the difference between the end value of the tool and the current value is smaller than the difference between the end value and the warning value, the information about the life of the tool is displayed in red. For example, in the case of tool 1, when the current value is 3801 or more, the information regarding the life of tool 1 is displayed in red. By changing the color of the tool life-related information according to the remaining life value, the operator can intuitively recognize the length of the remaining life of each tool.

FIG. 6 is a conceptual diagram showing an example of a history table storing the machining time of each tool and the number of holes made. The storage unit 80c stores a history table for each machining program. The history table stores the machining time and the number of holes made corresponding to the tool number. The machining time is the time the tool is used for machining, and the number of holes created is the number of holes created using the tool. The control device 80 updates the machining time and the number of created holes in the history table each time the tool is used to machine the workpiece. Based on the information in the history table, the control device 80 can convert the life of the tool in units of the number of holes or hours of use into the number of machining programs.

FIG. 7 shows an example of the display section 55 that displays information about the life of each tool. The display unit 55 displays the tool number, unit, current value and end value based on the used tool table of FIG. The controller 80 repeatedly executes the machining program and updates the current values in the used tool table. The display unit 55 updates information regarding the life of each tool during execution of the machining program. The control device 80 calculates the ratio of the difference between the end value and the current value to the end value for each tool, and determines the location of information regarding the life of each tool according to the ratio. Specifically, they are displayed on the display unit 55 in descending order of ratio.

In the case of FIG. 7, the ratio of the difference between the end value and the current value with respect to the end value of tool 1 is (4000-3570)/4000, so 10.75% of the difference between the end value and the current value with respect to the end value of tool 2 The ratio is (12000-10560)/12000, so it is 12%. The ratio of the difference between the end value and the current value to the end value of tool 3 is (3500-3010)/3500, so it is 14%. The end value to the end value of tool 4. and the current value is (1500-1260)/1500, so it is 16%. is. The display unit 55 displays information on the life of tools 1 to 5 arranged in order from the left.

For example, one execution of the machining program increases the current value of tool 1 by 20, the current value of tool 2 by 40, the current value of tool 3 by 10, and the current value of tool 4 by 10. . FIG. 8 is an example of the display section 55 displaying information about the life of each tool after executing the machining program 10 times from the state of FIG.

After 10 runs of the machining program, the current value of tool 1 is 3770 and the percentage is 5.75%. The current value for tool 2 is 10960 and the percentage is 8.67%. The current value for tool 3 is 3110, and the percentage is 11.14%. The current value for tool 4 is 1360, and the percentage is 9.3%. The current value for tool 5 is 120 and the percentage is 25%. That is, the proportion of tool 4 is smaller than the proportion of tool 3. Therefore, the control device 80 arranges the information regarding the life of the tool 4 to the left of the tool 3 and displays it on the display section 55 .

FIG. 9 is a flowchart for explaining tool life display processing by the control device 80 . The control device 80 waits until the operator selects a machining program (S1: NO). When the operator selects a machining program (S1: YES), the control device 80 reads the machining program (S2), and determines whether or not the history table of the read machining program is stored in the storage unit 80c (S3). ). When the history table of the machining program is stored in the storage unit 80c (S3: YES), that is, when the same machining program is executed for the second time or later, the update date and time of the history table is earlier than the update date and time of the machining program. It is determined whether or not it is new (S4).

If the update date and time of the history table is newer than the update date and time of the machining program (S4: YES), it is determined that the contents of the machining programs are the same, and the tool whose life is to be displayed on the display unit 55 is determined (S5). That is, the tool in the history table is determined as the tool whose life is to be displayed on the display unit 55 .

The control device 80 executes a life display process, which will be described later (S6), starts the operation of the machine tool (S7), and executes an operation process until the execution of the machining program is completed (S8).

In S3, if the history table of the machining program is not stored in the storage unit 80c (S3: NO), or if the update date and time of the history table is not newer than the update date and time of the machining program (S4: NO), that is, the selection If the content of the machining program executed is the first execution, the controller 80 determines whether or not the capacity of the machining program is smaller than the storage capacity of the RAM 80b (S9). If the capacity of the machining program is smaller than the storage capacity of the RAM 80b (S9: YES), the entire machining program is read into the RAM 80b, the character string of the machining program is searched (S10), and the tool whose life is displayed on the display unit 55 is determined. (S11). The control device 80 does not interpret the lines of the machining program, but simply retrieves the character string, stores the character string indicating the tool, in other words, the identifier for identifying the tool, and displays the tool indicated by the stored identifier on the display unit. A tool whose life is displayed at 55 is determined. For example, a character string beginning with T corresponds to an identifier that identifies a tool. The control device 80 advances the process to S6. In S9, if the capacity of the machining program is not smaller than the storage capacity of the RAM 80b (S9: NO), the controller 80 advances the process to S7.

FIG. 10 is a flowchart for explaining the life display processing by the control device 80. As shown in FIG. Note that the operator has already input the unit, end value, and notice value corresponding to the tool number of each tool to the control device 80 . The control device 80 determines whether or not the unit of each tool whose life is displayed on the display section 55 is mixed (S21). If the unit is mixed (S21: YES), the ratio of the difference between the end value and the current value is calculated by the method described above, and the ratio of the remaining life of each tool is calculated (S22), The information on the life of each tool is arranged in ascending order of ratio, that is, in ascending order of ratio (S23). The control device 80 determines the color of the information about the life of each tool to be displayed on the display section 55, and displays a predetermined number of pieces of information in the display area of the display section 55 in ascending order of ratio and displayed in the determined color. (S24, see FIG. 7). The predetermined number is determined based on the size of the display area of the display section 55 . As described above, the predetermined color is determined based on the advance notice value. The control device returns the processing to S7. If they are not mixed (S21: NO), the control device 80 sorts them in descending order of remaining life (S25), and proceeds to S24.

FIG. 11 is a flowchart for explaining processing during operation by the control device 80 . After starting operation of the machine tool (S7), the control device 80 newly secures an area for the history table in the storage unit 80c (S31), reads a line of the machining program (S32), and terminates the command of the read line. It is determined whether or not it is an instruction (S33). If the command in the read line is an end command (S33: YES), the tool-in-use table and the history table are referred to, and the current value of the tool is incremented by one (S34). The value obtained is stored in the used tool table and the history table (S35), the life display process is executed (S36), and the process is terminated.

In S33, if the read line command is not the end command (S33: NO), the control device 80 determines whether the read line command is a cutting movement command, for example, G1 (S37). If the command in the read line is not a cutting move command (S37: NO), the control device 80 determines whether the command in the read line is a drilling command, for example, G83 (S38). If the command in the read line is not a drilling command (S38: NO), the control device 80 determines whether the command in the read line is a tool change command, eg, G100 (S39). If the command of the read line is not a tool change command (S39: NO), the control device 80 executes the command of the read line (S40) and returns the process to S32.

In S39, if the command in the read line is a tool change command (S39: YES), the tool to be replaced is stored in the history table (S41), the tool is changed (S42), and the process returns to S32.

In S38, if the command of the read line is a drilling command (S38: YES), the control device 80 executes the drilling command (S43), and determines whether the unit of the tool used for drilling is the number of holes. (S44). If the unit of the tool used for drilling is not the number of holes (S44: NO), the process returns to S32. If the unit of the tool used for drilling is the number of holes (S44: YES), the number of holes created is added to the current value of the tool used for drilling by referring to the used tool table and the history table. The value is stored in the used tool table and history table (S45), the life display process is executed (S46), and the process returns to S32.

In S37, if the command in the read line is a cutting movement command (S37: YES), it is determined whether the unit of the tool used for cutting movement is time (S47). If the unit of the tool used for the cutting movement is not time (S47: NO), the control device 80 executes the cutting movement (S53) and returns the process to S32. If the unit of the tool used for the cutting movement is time (S47: YES), the control device 80 starts timing (S48), executes the cutting movement (S49), and waits until the cutting movement ends (S50). : NO). If the cutting movement has ended (S50: YES), the control device 80 ends the clocking (S51), refers to the used tool table and the history table, and adds the clocked time to the current value of the tool used for the cutting movement. are stored in the used tool table and the history table (S52), and the process proceeds to S46.

In the machine tool according to Embodiment 1, a value obtained by subtracting the current value (a value corresponding to the frequency of use of the tool) from the end value (life value), that is, the remaining life value is calculated, and the remaining life value with respect to the end value is calculated. Calculate the percentage of values. By using the above ratio, the units are unified, and it becomes easy to understand the long and short remaining lives of tools with different units.

Also, an identifier for identifying the tool is read out from the machining program, and the life information of the tool is displayed in association with the read identifier. For example, when a machining program is first executed and the tool life information is displayed, the machining program can be read out and the tool life information displayed even if the information on the tool to be used is not stored in advance in the storage unit. (See S9 to S10 and S6 in FIG. 9).

A threshold is set based on the advance notice value, and the set threshold is compared with the remaining life value to determine the color of the life information to be displayed on the display unit 55 . By changing the color of the life information according to the length of the remaining life, the operator can intuitively recognize the length of the remaining life of each tool.
The operation panel 54 corresponds to a setting section. The control device 80 that executes S34, S45, and S52 corresponds to the updating unit. The control device 80 that executes S22 corresponds to the calculation section. The control device 80 that executes S24 corresponds to the position determining section.
As an updating unit, in Embodiment 1, the current value is updated by adding the number of times, time, or the number of holes each time the tool is used. The value obtained by subtracting the number may be used as the current value, and the current value may be updated by subtracting each time the tool is used. In this case, the ratio calculated in S22 is the current value/end value, and the remaining life value as the threshold value, for example, 200 for tool 1, is stored in the notice value column in FIG. 5, and the current value column in FIG. displays the subtracted value.

(Embodiment 2)
The present invention will be described below based on the drawings showing a machine tool according to Embodiment 2. FIG. FIG. 12 is an example of the display section 55 that converts the remaining life value into the number of executable times of the machining program and displays information on the life of each tool based on the converted executable number of times. The information on the life of each tool in FIG. 12 corresponds to the information on the life of each tool in FIG. When the operator operates the operation panel 54 and selects the number display method, the control device 80 converts the remaining life value of each tool into the number of executable times of the machining program, and based on the converted number of executable times, each tool information on the life of the battery is displayed on the display unit 55.

As described in the first embodiment, for example, one execution of the machining program increases the current value of tool 1 by 20, the current value of tool 2 by 40, and the current value of tool 3 by 10. , the current value of tool 4 is increased by 10. The difference between the end value of the tool 1 and the current value is 430, which is 430/20=21.5 when converted into the number of executable times of the machining program. The numbers below the decimal point are rounded down, and the number of times the tool 1 can be executed is set to 21 times. The same applies to the tools 2 and after. The difference between the end value and the current value of the tool 2 is 1440, which is 1440/40=36 when converted into the number of executable times of the machining program. The difference between the end value of the tool 3 and the current value is 490, which is 490/10=49 when converted into the number of executable times of the machining program. The difference between the end value of the tool 4 and the current value is 240, which is 240/10=24 times when converted into the number of executable times of the machining program. When the machining programs are arranged in descending order of the number of executable times, that is, in ascending order, the order is tool 1, tool 4, tool 2, tool 5, and tool 3. As shown in FIG. 12, the control device 80 displays information on the life of each tool on the display unit 55 in ascending order of the number of times the machining program can be executed. Note that the number of executable times of the machining program may be displayed on the display section 55 . For example, the number of executable times of the machining program is displayed below the end value, or the number of executable times of the machining program is displayed instead of the current value.

FIG. 13 is a flowchart for explaining tool life display processing by the control device 80 . S61 to S65 in FIG. 13 are the same as S1 to S5 in FIG. 9, and S68 to S73 in FIG. 13 are the same as S9 to S11 and S6 to S8 in FIG. and S67 only. After determining the tool whose life is to be displayed on the display unit 55 (S65), the control device 80 determines whether or not the operator has operated the operation panel 54 to select the number of times display method (S66). If the number of times display method is not selected (S66: NO), the control device 80 advances the process to S71 and executes the life display process. If the number display method is selected (S66: YES), the control device 80 executes conversion display processing (S67).

FIG. 14 is a flowchart for explaining conversion display processing by the control device 80 . The control device 80 converts the remaining life value of each tool into the executable number of times of the machining program (S81), and arranges the information on the life of each tool in ascending order of the executable number, that is, in ascending order (S82). The control device 80 determines the color of the information about the life of each tool to be displayed on the display unit 55, and arranges a predetermined number of pieces of information in the display area of the display unit 55 in ascending order of the number of executions and displays them in a predetermined color. (S83, see FIG. 12). The predetermined number is determined based on the size of the display area of the display section 55 . As described above, the predetermined color is determined based on the advance notice value. The control device 80 returns the process to S72, starts the operation of the machine tool, and executes the process during operation (S73).

FIG. 15 is a flowchart for explaining processing during operation by the control device 80 . 15 correspond to S31 to S35 in FIG. 11, S99 to S107 in FIG. 15 correspond to S37 to S45 in FIG. 11, and S111 to S117 in FIG. 15 correspond to S47 to S53 in FIG. , the detailed description thereof will be omitted, and only S96 to S98 and S108 to S110 of FIG. 15 will be described.

In S95, after storing the added value in the used tool table and the history table, the control device 80 determines whether or not the number display method is selected (S96). If the number of times display method is selected (S96: YES), a conversion display process is executed (S97), and the process ends. If the frequency display method is not selected (S96: NO), the life display process is executed (S98), and the process ends.

After adding the number of holes made to the current value of the tool used for drilling in S107, the control device 80 determines whether or not the number of times display method has been selected (S108). If the number of times display method is selected (S108: YES), a conversion display process is executed (S109), and the process returns to S92. If the frequency display method is not selected (S108: NO), the life display process is executed (S110), and the process returns to S92.

In the machine tool according to Embodiment 2, when the usage time of the tool or the number of holes formed in the work is selected as the unit indicating the life of the tool, the tool for which the usage time or the number of holes is selected has a remaining Convert the life value into the number of times the machining program can be executed. A position for displaying the life information of each tool is determined based on the converted executable number of times. For example, the tool life information is displayed in descending order of the number of times the machining program can be executed. When the same machining program is continuously executed, a display based on the number of executable times is often easier for the operator to understand the remaining time than a display based on the usage time or the number of holes. In addition, the operator can immediately replace the tool for which the executable count has become 0 at the end of the machining program.

Further, the operator can display the tool life information based on the ratio or display the tool life information based on the executable number, as required.

In the embodiment described above, the current value obtained by adding the value to the initial value is displayed on the display section 55, but the difference between the end value and the current value, that is, the remaining life value may be displayed. FIG. 16 shows an example of the display section 55 that displays information about the life of each tool, in which the remaining life value is displayed instead of the current value. The information shown in FIG. 16 corresponds to the information shown in FIG. 7. For example, the tool 1 in FIG. A remaining life value 430 obtained by subtracting the value 3570 is displayed. That is, FIG. 7 shows a count-up display, while FIG. 16 shows a count-down display. Both the current value and the remaining life value may be displayed. The control device 80 that executes S94, S107, and S116 corresponds to the updating unit. The control device 80 that executes S91, S95, S103, S107, and S116 corresponds to the creating section. The control device 80 that executes S24 corresponds to the position determining section. The control device 80 that executes S24 corresponds to the position determining section. The control device 80 that executes S81 corresponds to the conversion section. The control device 80 that executes S83 corresponds to the second position determining section. The control device 80 that executes S96 and S108 corresponds to the reception unit. The operation panel 54 corresponds to the second receiving section, and the control device 80 that executes S70 corresponds to the reading section. The operation panel 54 corresponds to a threshold value setting section. The control device 80 that executes S83 corresponds to the color determination section.

REFERENCE SIGNS LIST 10 tool changer 32 spindle head 54 operation panel 55 display unit 80 control device (tool life management device)
80a CPU
80b RAM
80c storage unit 100 machine tool

Claims (13)

a setting unit that selects one of a plurality of units for indicating tool life and sets a tool life value for each tool based on the selected unit;
an updating unit that updates a value according to the current frequency of use of the tool each time the tool is used;
a computing unit that computes the ratio of the value corresponding to the current tool usage frequency updated by the updating unit to the life value set by the setting unit;
a position determination unit that determines a position for displaying the life information of each tool on the display unit based on the ratio calculated by the calculation unit ;
a second reception unit that receives selection of a machining program for machining a workpiece;
a reading unit that reads an identifier for identifying a tool from the received machining program when the selection of the machining program is received by the second receiving unit;
with
A tool life management device for displaying tool life information on the display unit in association with the identifier read by the reading unit. a setting unit that selects one of a plurality of units for indicating tool life and sets a tool life value for each tool based on the selected unit;
an updating unit that updates a value according to the current frequency of use of the tool each time the tool is used;
a computing unit that computes the ratio of the value corresponding to the current tool usage frequency updated by the updating unit to the life value set by the setting unit;
a position determination unit that determines a position for displaying the life information of each tool on the display unit based on the ratio calculated by the calculation unit;
a capacity determination unit that determines whether or not the capacity of the machining program for machining the workpiece is smaller than the storage capacity of the storage unit;
a reading unit that sequentially reads instructions included in the machining program when the capacity of the machining program is not smaller than the storage capacity of the storage unit;
an end determination unit that determines whether the instruction read by the reading unit is an end instruction;
with
If the termination instruction is determined by the end determination unit, updating of the value by the updating unit, calculation of the ratio by the calculation unit, and determination of the position by the position determination unit are executed.
Tool life management device. The plurality of units includes the tool usage time, the number of holes formed in the workpiece, and the number of executions of the machining program for machining the workpiece,
a creation unit that updates and creates a history table that stores the tool usage time and the number of holes to be formed in the workpiece, corresponding to the machining program, each time the workpiece is machined;
a conversion unit that converts the value updated by the updating unit into the executable number of times of the machining program based on the history table created by the creating unit when the usage time or the number of holes is selected;
The tool life management device according to claim 1 or 2 , further comprising: a second position determination unit that determines a position for displaying tool life information on the display unit based on the executable number of times converted by the conversion unit. . 3. A reception unit that receives a selection of whether to display the tool life information at the position determined by the position determination unit or to display the tool life information at the position determined by the second position determination unit. The tool life management device described in . a second reception unit that receives selection of a machining program for machining a workpiece;
a reading unit that reads an identifier for identifying a tool from the received machining program when the selection of the machining program is received by the second receiving unit,
The tool life management device according to claim 2 , wherein tool life information is displayed on the display unit in association with the identifier read by the reading unit. a threshold value setting unit that sets a threshold value related to tool life in association with each tool;
A color determination unit that compares the threshold value set by the threshold value setting unit and the value updated by the update unit, and determines the color of the life information to be displayed on the display unit based on the comparison result. 6. The tool life management device according to any one of 1 to 5 . a spindle head;
a tool changer;
A machine tool comprising the tool life management device according to any one of claims 1 to 6 . Select one unit from a plurality of units for indicating tool life, set the tool life value for each tool based on the selected unit,
Each time you use the tool, update the value according to the current tool usage frequency,
Calculate the ratio of the updated value according to the current tool usage frequency to the set life value,
Based on the calculated ratio, determine the position to display the life information of each tool on the display unit ,
Accepts selection of machining programs for machining workpieces,
reading an identifier for identifying a tool from the accepted machining program when the selection of the machining program is accepted;
A display processing method for displaying tool life information on the display section in association with the read identifier . Select one unit from a plurality of units for indicating tool life, set the tool life value for each tool based on the selected unit,
Each time you use the tool, update the value according to the current tool usage frequency,
Calculate the ratio of the updated value according to the current tool usage frequency to the set life value,
Based on the calculated ratio, determine the position to display the life information of each tool on the display unit,
determining whether or not the capacity of the machining program for machining the workpiece is smaller than the storage capacity of the storage unit;
when the capacity of the machining program is not smaller than the storage capacity of the storage unit, sequentially reading instructions included in the machining program;
determine whether or not the read instruction is an end instruction,
If it is determined to be the termination instruction, updating the value, calculating the ratio, and determining the position are performed.
Display processing method. The plurality of units includes the tool usage time, the number of holes formed in the workpiece, and the number of executions of the machining program for machining the workpiece,
A history table that stores the tool usage time and the number of holes to be formed in the workpiece corresponding to the machining program is updated and created each time the workpiece is machined,
When the usage time or the number of holes is selected, the updated value corresponding to the current tool usage frequency is converted into the number of executable times of the machining program based on the created history table,
10. The display processing method according to claim 8 , further comprising determining a position for displaying the life information of the tool on the display unit based on the converted executable number of times. Select one unit from a plurality of units for indicating tool life, set the tool life value for each tool based on the selected unit,
Each time you use the tool, update the value according to the current tool usage frequency,
Calculate the ratio of the updated value according to the current tool usage frequency to the set life value,
Based on the calculated ratio, determine the position to display the life information of each tool on the display unit ,
Accepts selection of machining programs for machining workpieces,
reading an identifier for identifying a tool from the accepted machining program when the selection of the machining program is accepted;
A computer program that can be executed by a tool life management device for executing a process of displaying tool life information on the display unit in association with the read identifier . Select one unit from a plurality of units for indicating tool life, set the tool life value for each tool based on the selected unit,
Each time you use the tool, update the value according to the current tool usage frequency,
Calculate the ratio of the updated value according to the current tool usage frequency to the set life value,
Based on the calculated ratio, determine the position to display the life information of each tool on the display unit,
determining whether or not the capacity of the machining program for machining the workpiece is smaller than the storage capacity of the storage unit;
when the capacity of the machining program is not smaller than the storage capacity of the storage unit, sequentially reading instructions included in the machining program;
determine whether or not the read instruction is an end instruction,
If it is determined to be the termination instruction, updating the value, calculating the ratio, and determining the position are performed.
let the process run
A computer program executable by a tool life control device. The plurality of units includes the tool usage time, the number of holes formed in the workpiece, and the number of executions of the machining program for machining the workpiece,
A history table that stores the tool usage time and the number of holes to be formed in the workpiece corresponding to the machining program is updated and created each time the workpiece is machined,
When the usage time or the number of holes is selected, the updated value corresponding to the current tool usage frequency is converted into the number of executable times of the machining program based on the created history table,
13. The computer program according to claim 11 or 12 , wherein a process of determining a position for displaying tool life information on said display unit is executed based on said converted executable number of times.

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