JP2020055054A - Tool life management device, machine tool, display processing method, and computer program - Google Patents

Abstract

To provide a tool life management device that facilitates understanding of the lengths of residual lives of tools even when the residual lives of a plurality of tools are managed in different units, and a machine tool or the like.SOLUTION: A tool life management device includes: a setting unit for selecting a unit from a plurality of units showing lives of tools and setting the life value of each tool on the basis of the selected unit; an update unit for updating a value corresponding to the use frequency of the current tool each time the tool is used; a calculation unit for calculating a ratio of the value corresponding to the use frequency of the current tool updated by the update unit to the life value set by the setting unit; and a position determination unit for determining a position for displaying the life information of each tool on a display unit on the basis of the ratio calculated by the calculation unit.SELECTED DRAWING: Figure 8

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 inform 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 use time of the tool, the number of holes formed in the work, and the number of work pieces that can be processed. The tool life management device can display the remaining life of the tool on a display device by a user's operation (for example, see Patent Document 1).

JP-A-5-305552

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

  The present invention has been made in view of the above circumstances, and provides a tool life management device and a machine tool in which the remaining life of a tool is easily understood even if the life of a plurality of tools is managed in different units. With the goal.

  A tool life management device according to the present invention, a plurality of units for indicating the life of the tool, from the selected unit, based on the selected unit, based on the selected unit, the setting unit to set the life value of the tool for each tool, An updating unit that updates a value according to the current tool use frequency each time a tool is used, and a value according to the current tool use frequency updated by the update unit for the life value set by the setting unit And a position determining unit that determines a position at which the tool life information of each tool is displayed on the display unit based on the ratio calculated by the calculating 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 setting the ratio, the units are unified, and it becomes easy to understand the length of the remaining life of the tools having different units. Further, the position at which the life information of each tool is displayed is determined based on the ratio, and, for example, the life information is displayed in ascending order of the tools. An operator can easily recognize a tool having a short remaining life.

  In the tool life management device according to the present invention, the plurality of units include a use time of the tool, a number of holes to be formed in the work, and a number of executions of a machining program for machining the work, and correspond to the machining program. The history table storing the use time and the number of holes formed in the work is updated each time the work is processed, and the creation unit to be created, and when the use time or the number of holes is selected, the value updated by the update unit is Based on the history table created by the creating unit, a conversion unit that converts the number of executable times of the machining program, based on the number of executable times converted by the conversion unit, the tool life information in the display unit, A second position determining unit that determines a position to be displayed.

  In the present invention, when the use time of the tool or the number of holes to be 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 use time or the number of holes is selected can be used to execute the machining program. Convert to the number of times. A position for displaying the life information of each tool is determined based on the converted executable number. For example, the life information is displayed in order from a tool having a small number of executable times of the machining program. When the same machining program is continuously executed, the display based on the number of executable times is often easier for the operator to understand the remaining time than the display based on the use time or the number of holes. At the end of the machining program, the operator can immediately change the tool whose executable number has become 0.

  The tool life management device according to the present invention displays tool life information at a position determined by the position determination unit or displays tool life information at a 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 the tool life information based on the ratio or the tool life information based on the executable number as needed.

  A tool life management device according to the present invention includes a second receiving unit that receives a selection of a processing program for processing a workpiece, and the processing that is received when the second receiving unit receives the selection of the processing program. A reading unit that reads an identifier for identifying the tool from the program; and displays tool life information 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 tool life information is displayed in association with the read identifier. For example, when a machining program is first executed and tool life information is displayed, even if information on a tool to be used is not stored in a storage unit in advance, the machining program is read and tool life information is displayed. Can be.

  The tool life management device according to the present invention compares a threshold value set by the threshold value setting unit with a threshold value set by the threshold value setting unit and a value updated by the update unit in association with each tool. A color determining 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 color of the life information displayed on the display unit is determined by comparing the threshold value with the value after the subtraction by the subtraction unit, that is, the remaining life value. 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 changing device, 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 setting the ratio, the units are unified, and it becomes easy to understand the length of the remaining life of the tools having different units. Further, the position at which the life information of each tool is displayed is determined based on the ratio, and, for example, the life information is displayed in ascending order of the tools. An operator can easily recognize a tool having a short remaining life.

  The display processing method according to the present invention includes selecting one of a plurality of units for indicating the life of a tool, setting a life value of the tool for each tool based on the selected unit, and using the tool. Each time, the value according to the current tool use frequency is updated, the ratio of the value according to the updated current tool use frequency to the set life value is calculated, and based on the calculated ratio, the display unit displays The position where the life information of each tool is displayed is determined.

  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 setting the ratio, the units are unified, and it becomes easy to understand the length of the remaining life of the tools having different units. Further, the position at which the life information of each tool is displayed is determined based on the ratio, and, for example, the life information is displayed in ascending order of the tools. An operator can easily recognize a tool having a short remaining life.

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

  In the present invention, when the use time of the tool or the number of holes to be 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 use time or the number of holes is selected can be used to execute the machining program. Convert to the number of times. A position for displaying the life information of each tool is determined based on the converted executable number. For example, the life information is displayed in order from a tool having a small number of executable times of the machining program. When the same machining program is continuously executed, the display based on the number of executable times is often easier for the operator to understand the remaining time than the display based on the use time or the number of holes. At the end of the machining program, the operator can immediately change the tool whose executable number has become 0.

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

  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 setting the ratio, the units are unified, and it becomes easy to understand the length of the remaining life of the tools having different units. Further, the position at which the life information of each tool is displayed is determined based on the ratio, and, for example, the life information is displayed in ascending order of the tools. An operator can easily recognize a tool having a short remaining life.

  The computer program according to the present invention, wherein the plurality of units include a tool use time, the number of holes formed in the work, and the number of executions of the machining program for machining the work, and correspond to the machining program, And a history table storing the number of holes formed in the work is updated and created each time the work is processed, and when the use time or the number of holes is selected, a value according to the updated current use frequency of the tool is set. Based on the created history table, the number of executable times of the machining program is converted, and based on the converted number of executable times, a process of determining a position for displaying tool life information on the display unit is executed.

  In the present invention, when the use time of the tool or the number of holes to be 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 use time or the number of holes is selected can be used to execute the machining program. Convert to the number of times. A position for displaying the life information of each tool is determined based on the converted executable number. For example, the life information is displayed in order from a tool having a small number of executable times of the machining program. When the same machining program is continuously executed, the display based on the number of executable times is often easier for the operator to understand the remaining time than the display based on the use time or the number of holes. At the end of the machining program, the operator can immediately change the tool whose executable number has become 0.

  In the tool life management device, the machine tool, the display processing method, and the 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 the life value is calculated. Calculate the percentage of the remaining life value. By setting the ratio, the units are unified, and it becomes easy to understand the length of the remaining life of the tools having different units.

FIG. 2 is a schematic perspective view of the machine tool according to the first embodiment. It is a perspective view which shows the cover for machine tools simply. It is a block diagram of a control device. It is a conceptual diagram showing an example of a processing program. It is a conceptual diagram showing an example of a used tool table which stored information about the life of a tool used for processing. It is a conceptual diagram showing an example of a history table which stored the processing time of each tool and the number of holes to be created. It is an example of the display part which displays the information regarding the life of each tool. 8 is an example of a display unit that displays information on the life of each tool after executing the machining program ten times from the state of FIG. 7. It is a flowchart explaining a tool life display process by a control device. It is a flowchart explaining a life display process by a control device. It is a flowchart explaining a process during a driving | operation by a control apparatus. In Embodiment 2, it is an example of the display part which converted the remaining life value into the executable number of machining programs and displayed information on the life of each tool based on the converted executable number. It is a flowchart explaining a tool life display process by a control device. It is a flow chart explaining conversion display processing by a control device. It is a flowchart explaining a process during a driving | operation by a control apparatus. It is an example of the display part which displays the information regarding the life of each tool which displayed the remaining life value instead of the current value.

(Embodiment 1)
Hereinafter, the present invention will be described with reference to the drawings showing a machine tool according to a first embodiment. In the following description, upper, lower, front, rear, left and right shown in the figure will be used. FIG. 1 is a schematic perspective view of the machine tool 100. The machine tool 100 includes a machine main body, which includes a base 20, a fixed base 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 changing device 10. , A spindle motor 35 and the like. The base 20 is fixed on the floor. A work holding unit 120 is provided at the front of the fixed base 21. The fixed base 21 has a rectangular box shape in a plan view that is long 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. The 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 (left-right direction) and the Y direction (front-rear direction).

  The Z-direction moving device 30 is provided on the front surface 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. The spindle head 32 is provided on the Z-direction moving device 30. The column 28 supports the spindle head 32 via a Z-direction moving device 30 so as to be movable in the Z direction (vertical direction). The spindle motor 35 is provided above the spindle head 32. The spindle head 32 supports a spindle (not shown) whose upper and lower sides are in the axial direction. The main shaft motor 35 rotates around the main shaft. The tool changing device 10 changes a tool to be mounted on the spindle.

  FIG. 2 is a perspective view schematically showing the cover 1 for a machine tool. As shown in FIG. 2, the machine tool 100 includes a machine tool cover 1 surrounding the machine body. The machine tool cover 1 is provided above the base 20. The machine tool cover 1 extends in the up-down direction, and includes a rectangular front wall 5, a left wall 6, a right wall 7, and a rear wall 8 that respectively cover the front, rear, left, and right sides of the machine body of the machine tool 100. Moreover, it has a rectangular ceiling 9 which covers the upper side of the machine tool 100 and is parallel to the left-right direction and the front-back direction. A vertically-long rectangular opening 51 is provided at the center of the front wall 5, and an operation panel 54 for inputting a command by an operator is provided on the right of the opening 51. A display unit 55 is provided above the operation panel 54. In the opening 51, a vertically long right door 52 and a left door 53 are juxtaposed so as to be movable in the left-right direction.

  FIG. 3 is a block diagram of the control device 80. 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 the power supplied to the motor. The control device 80 includes a CPU 80a, a RAM 80b, a storage unit 80c, and the like. The storage unit 80c is, for example, a nonvolatile memory or a hard disk. The CPU 80a reads the control program stored in the storage unit 80c into the RAM 80b, and controls the machine tool 100. The CPU 80a has a timer function. The control device 80 receives an operation signal from the operation panel 54 and outputs a signal for displaying information on the display unit 55. The display unit 55 displays information. Instead of the CPU 80a, a logic circuit such as an FPGA may be used.

  FIG. 4 is a conceptual diagram illustrating an example of a machining program. As shown in FIG. 4, the column of "number" indicates a line number, and the column of "instruction" indicates a process to be executed. The storage unit 80c stores a processing program for processing a work. The machining program has a plurality of lines (instructions). The CPU 61 reads the rows in order and executes the instructions. G100 in the N1 line indicates a tool change command, and T1 indicates a number of a tool to be mounted on the next spindle. X-60 indicates the standby position of the main shaft in the left and right direction after the tool change, Y-20 indicates the standby position in the front and rear direction of the main shaft after the tool change, and Z20 indicates the vertical standby position of the main shaft after the tool change.

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

  FIG. 5 is a conceptual diagram showing an example of a used tool table storing information on the life of a tool used for machining. The storage unit 80c stores a tool table to be used. 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 notice value, and the current value of the life. The unit is, for example, the number of holes created in the work, the use 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 a unit, an end value, and a notice value corresponding to the tool number to the control device 80. For example, the number of holes is input in the unit of the tool of the tool number 1 (hereinafter, the tool of the tool number N (N = 1, 2, 3,...) Is simply referred to as the tool N). The operator selects a unit 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 a number at which the life of the tool expires. The notice value is a threshold value for indicating that the time to change the tool is approaching.

  The operator operates the operation panel 54 to select a predetermined machining program. When manufacturing the same product in large quantities, the operator repeats the execution of the machining program. The control device 80 executes the machining program, and 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 on the life of each tool on the display unit 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 larger than twice the difference between the end value and the notice value, information on the life of the tool is displayed in green. For example, in the case of the tool 1, since the difference between the end value and the notice value is 200, when the current value is 3600 or less, information on the life of the tool 1 is displayed in green.

  If the difference between the end value of the tool and the current value is smaller than twice the difference between the end value and the notice value, and greater than the difference between the end value and the notice value, the tool life information is displayed in yellow. I do. For example, in the case of the tool 1, when the current value is 3601 to 3800, information on the life of the tool 1 is displayed in yellow.

  When the difference between the end value of the tool and the current value is smaller than the difference between the end value and the notice value, information on the life of the tool is displayed in red. For example, in the case of the tool 1, when the current value is 3801 or more, information on the life of the tool 1 is displayed in red. By changing the color of the information on the life of the tool according to the magnitude of 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 and the number of holes to be created for each tool. The storage unit 80c stores a history table for each machining program. The history table stores the processing time and the number of created holes corresponding to the tool number. The machining time is the time when the tool is used for machining, and the number of created holes is the number of holes created using the tool. The control device 80 updates the processing time and the number of holes to be prepared in the history table every time the work is processed using the tool. The control device 80 can convert the tool life in units of the number of holes or the use time into the number of machining programs based on the information in the history table.

  FIG. 7 is an example of the display unit 55 that displays information on the life of each tool. The display unit 55 displays a tool number, a unit, a current value, and an end value based on the used tool table of FIG. The control device 80 repeatedly executes the machining program and updates the current value of the used tool table. The display unit 55 updates information on 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 with respect to the end value for each tool, and determines the position of the information regarding the life of each tool according to the ratio. Specifically, they are arranged and displayed on the display unit 55 in ascending order of proportion.

  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 the tool 1 is (4000−3570) / 4000, so 10.75%. Since the ratio is (12000-10560) / 12000, it is 12%, and the ratio of the difference between the end value for the end value of the tool 3 and the current value is (3500-3010) / 3500, so 14%, the end value for the end value of the tool 4 The ratio of the difference between the current value and the end value of the tool 5 is 16% because the ratio of the difference between the current value and the end value of the tool 5 is (150-110) / 150, and is 26.67%. It is. The display unit 55 displays information on the life of the tools 1 to 5 in order from the left.

  For example, a single execution of the machining program increases the current value of tool 1 by 20, increases the current value of tool 2 by 40, increases the current value of tool 3 by 10, and increases the current value of tool 4 by 10. . FIG. 8 is an example of the display unit 55 that displays information on the life of each tool after the machining program is executed ten times from the state of FIG.

  After executing the machining program ten times, the current value of the tool 1 becomes 3770, and the ratio becomes 5.75%. The current value of the tool 2 is 10960, and the ratio is 8.67%. The current value of the tool 3 is 3110, and the ratio is 11.14%. The current value of the tool 4 is 1360, and the ratio is 9.3%. The current value of the tool 5 is 120, and the ratio is 25%. That is, the ratio of the tool 4 is smaller than the ratio of the tool 3. Therefore, the control device 80 arranges information on the life of the tool 4 on the left side of the tool 3 and displays the information on the display unit 55.

  FIG. 9 is a flowchart illustrating a tool life display process performed 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 a 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 greater than the update date and time of the machining program. It is determined whether or not it is new (S4).

  When 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 program are the same, and a tool for displaying the life on the display unit 55 is determined (S5). That is, the tool in the history table is determined to be the tool whose life is displayed on the display unit 55.

  The control device 80 executes a life display process described later (S6), starts the operation of the machine tool (S7), and executes an in-operation process until the execution of the machining program ends (S8).

  In S3, when the history table of the machining program is not stored in the storage unit 80c (S3: NO), or when 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 is performed. If the content of the processed program is the first execution, the control device 80 determines whether or not the capacity of the processed 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, a character string of the machining program is searched (S10), and a tool whose life is displayed on the display unit 55 is determined. (S11). The control device 80 does not interpret the line of the machining program, but simply searches for the character string, stores the character string indicating the tool, in other words, stores the identifier for identifying the tool, and displays the tool indicated by the stored identifier on the display unit. The tool whose life is indicated at 55 is determined. For example, a character string starting with T corresponds to an identifier for identifying a tool. 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 control device 80 proceeds to S7.

  FIG. 10 is a flowchart illustrating the life display process performed by the control device 80. The operator has already input the unit, end value, and notice value corresponding to the tool number of each tool into the control device 80. The control device 80 determines whether or not the units of each tool for which the life is displayed on the display unit 55 are mixed (S21). If the units are mixed (S21: YES), the above-mentioned method, that is, the ratio of the difference between the end value to the end value and the current value is calculated, and the ratio of the remaining life of each tool is calculated (S22). Information on the life of each tool is arranged in ascending order of the ratio, that is, in ascending order of the ratio (S23). The control device 80 determines the color of the information about the life of each tool displayed on the display unit 55, and displays a predetermined number of information in the display area of the display unit 55 in the color determined in ascending order of the ratio. (S24, see FIG. 7). The predetermined number is determined based on the size of the display area of the display unit 55. As described above, the predetermined color is determined based on the notice value. The control device returns the processing to S7. If not mixed (S21: NO), the control device 80 arranges the remaining life in ascending order, that is, in ascending order (S25), and proceeds to S24.

  FIG. 11 is a flowchart illustrating the in-operation processing by the control device 80. After starting the 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 instruction of the read line. It is determined whether it is a command (S33). If the command on the read line is an end command (S33: YES), the current tool value is incremented by one by referring to the used tool table and the history table (S34). The obtained values are stored in the tool table and the history table (S35), the life display process is executed (S36), and the process is terminated.

  In S33, if the command of the read line is not the end command (S33: NO), the control device 80 determines whether the command of the read line is a cutting movement command, for example, G1 (S37). When the command of the read line is not the cutting movement command (S37: NO), the control device 80 determines whether the read command of the line is a drilling command, for example, G83 (S38). If the command of the read line is not a drilling command (S38: NO), the control device 80 determines whether the command of the read line is a tool change command, for example, G100 (S39). When 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 of the read line is a tool change command (S39: YES), the tool to be changed 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. Is determined (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 current value of the tool used for drilling is added to and added to the current value of the tool used for drilling, referring to the tool table used and the history table. The values are stored in the used tool table and the history table (S45), a life display process is executed (S46), and the process returns to S32.

  In S37, if the command of the read line is a cutting movement command (S37: YES), it is determined whether or not the unit of the tool used for the cutting movement is time (S47). When 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 processing 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). When the cutting movement is completed (S50: YES), the control device 80 ends the time measurement (S51), and adds the measured time to the current value of the tool used for the cutting movement with reference to the used tool table and the history table. Then, the information is stored in the used tool table and the history table (S52), and the process proceeds to S46.

  In the machine tool according to the first embodiment, a value obtained by subtracting a current value (a value corresponding to the frequency of use of a tool) from an end value (life value), that is, a remaining life value, is calculated, and a remaining life corresponding to the end value is calculated. Calculate the percentage of the value. By setting the ratio, the units are unified, and it becomes easy to understand the length of the remaining life of the tools having different units.

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

In addition, a threshold is set based on the notice value, the set threshold is compared with the remaining life value, and the color of the life information displayed on the display unit 55 is determined. 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 unit. The control device 80 that executes S34, S45, and S52 corresponds to an updating unit. The control device 80 that executes S22 corresponds to a calculation unit. The control device 80 that executes S24 corresponds to a position determination unit.
In the first embodiment, the present value is updated by adding the number of times, the time, or the number of holes each time the tool is used as the updating unit. The value obtained by subtracting the number may be used as the current value, and the current value may be updated each time the tool is used. In this case, the ratio calculated in S22 is the current value / end value, and the notice value column in FIG. 5 stores a remaining life value serving as a threshold value, for example, 200 for the tool 1, and the current value column in FIG. Displays the subtracted value.

(Embodiment 2)
Hereinafter, the present invention will be described with reference to the drawings showing a machine tool according to a second embodiment. FIG. 12 is an example of the display unit 55 in which the remaining life value is converted into the executable number of the machining program, and information on the life of each tool is displayed based on the converted executable number. 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-of-times display method, the control device 80 converts the remaining life value of each tool into the executable number of the machining program, and based on the converted executable number, Is displayed on the display unit 55.

  As described in the first embodiment, for example, by executing the machining program once, the current value of the tool 1 increases by 20, the current value of the tool 2 increases by 40, and the current value of the tool 3 increases by 10 , The current value of the 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 times when converted into the executable number of machining programs. The numbers below the decimal point are rounded down, and the executable number of the tool 1 is set to 21 times. The same applies to the second and subsequent tools. The difference between the end value and the current value of the tool 2 is 1440, which is 1440/40 = 36 times when converted into the executable number of machining programs. The difference between the end value and the current value of the tool 3 is 490, which is 490/10 = 49 when converted into the executable number of machining programs. 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 executable number of machining programs. When the machining programs can be executed in ascending order, that is, in ascending order, the tool 1, the tool 4, the tool 2, the tool 5, and the tool 3 are in this order. 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 executable number of machining programs. Note that the number of executable times of the machining program may be displayed on the display unit 55. For example, the number of executable machining programs is displayed below the end value, or the number of executable machining programs is displayed instead of the current value.

  FIG. 13 is a flowchart illustrating a tool life display process performed 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 only S67 will be described. After determining the tool for displaying the life on the display unit 55 (S65), the control device 80 determines whether or not the operator operates the operation panel 54 and selects the number 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 a life display process. When the number-of-times display method is selected (S66: YES), the control device 80 executes a conversion display process (S67).

  FIG. 14 is a flowchart illustrating the 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 machining programs (S81), and arranges 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 on the life of each tool displayed on the display unit 55, and displays a predetermined number of information in a display area of the display unit 55 in a predetermined color in ascending order of the number of executions. (S83, see FIG. 12). The predetermined number is determined based on the size of the display area of the display unit 55. As described above, the predetermined color is determined based on the notice value. The control device 80 returns the processing to S72, starts the operation of the machine tool, and executes the in-operation processing (S73).

  FIG. 15 is a flowchart illustrating processing during operation by 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. Therefore, a detailed description thereof will be omitted, and only S96 to S98 and S108 to S110 in FIG. 15 will be described.

  In S95, the control device 80 stores the added value in the used tool table and the history table, and then determines whether the number display method has been 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 number-of-times display method is not selected (S96: NO), a life display process is executed (S98), and the process ends.

  In S107, after adding the created number of holes to the current value of the tool used for drilling, the control device 80 determines whether or not the number display method has been selected (S108). When 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 number-of-times 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 use time of the tool or the number of holes to be formed in the workpiece is selected as a unit indicating the life of the tool, the remaining tool is selected for the use time or the number of holes to be formed. The life value is converted to the number of executable machining programs. A position for displaying the life information of each tool is determined based on the converted executable number. For example, the life information is displayed in order from a tool having a small number of executable times of the machining program. When the same machining program is continuously executed, the display based on the number of executable times is often easier for the operator to understand the remaining time than the display based on the use time or the number of holes. At the end of the machining program, the operator can immediately change the tool whose executable number has become 0.

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

  In the above embodiment, the current value obtained by adding the value to the initial value is displayed on the display unit 55, but the difference between the end value and the current value, that is, the remaining life value may be displayed. FIG. 16 is an example of the display unit 55 that displays information on the life of each tool that displays the remaining life value 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. 7 displays the number of holes 3570 which is the current value, but the tool 1 in FIG. The 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. Note that both the current value and the remaining life value may be displayed. The control device 80 that executes S94, S107, and S116 corresponds to an updating unit. The control device 80 that executes S91, S95, S103, S107, and S116 corresponds to a creating unit. The control device 80 that executes S24 corresponds to a position determination unit. The control device 80 that executes S24 corresponds to a position determination unit. The control device 80 executing S81 corresponds to a conversion unit. The control device 80 executing S83 corresponds to a second position determination unit. The control device 80 that executes S96 and S108 corresponds to a receiving unit. The operation panel 54 corresponds to a second receiving unit, and the control device 80 executing S70 corresponds to a reading unit. The operation panel 54 corresponds to a threshold setting unit. The control device 80 that executes S83 corresponds to a color determination unit.

10 Tool Changer 32 Spindle Head 54 Operation Panel 55 Display 80 Control Device (Tool Life Management Device)
80a CPU
80b RAM
80c storage unit 100 machine tool

Claims (10)

A setting unit that selects any one of a plurality of units for indicating the life of the tool, and sets a life value of the tool 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 calculation unit that calculates a ratio of a value according to the current tool use frequency updated by the update unit to the life value set by the setting unit,
And a position determining unit for determining a position on the display unit for displaying the life information of each tool based on the ratio calculated by the calculation unit. The plurality of units include the use time of the tool, the number of holes to be formed in the work, and the number of executions of the processing program for processing the work,
A creation unit that updates and creates a history table corresponding to a machining program and stores a tool usage time and the number of holes to be formed in the work each time the work is machined,
When the use time or the number of holes is selected, a value updated by the update unit, based on a history table created by the creation unit, a conversion unit that converts the number of executable times of the machining program,
2. The tool life management device according to claim 1, further comprising: a second position determination unit that determines a position at which tool life information is displayed on the display unit based on the executable number converted by the conversion unit. 3. 3. A receiving unit that receives selection of whether to display tool life information at the position determined by the position determination unit or to display tool life information at the position determined by the second position determination unit. 4. Tool life management device according to 1. A second receiving unit that receives a selection of a processing program for processing 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 any one of claims 1 to 3, wherein tool life information is displayed on the display unit in association with the identifier read by the reading unit. A threshold setting unit that sets a threshold related to the life of the tool in association with each tool,
A color determination unit that compares a threshold value set by the threshold value setting unit with a value updated by the update unit, and determines a color of life information to be displayed on the display unit based on the comparison result. 5. The tool life management device according to any one of 1 to 4. A spindle head,
A tool changer,
A machine tool comprising: the tool life management device according to any one of claims 1 to 5. One of the units is selected from a plurality of units for indicating the life of the tool, and the life value of the tool is set for each tool based on the selected unit.
Each time the tool is used, update the value according to the current tool usage frequency,
Calculate the ratio of the value according to the updated use frequency of the tool to the set life value,
A display processing method for determining a position for displaying life information of each tool on the display unit based on the calculated ratio. The plurality of units include the use time of the tool, the number of holes to be formed in the work, and the number of executions of the processing program for processing the work,
Update and create a history table that corresponds to the machining program and stores the tool usage time and the number of holes formed in the work every time the work is machined,
When the use time or the number of holes is selected, a value corresponding to the updated current use frequency of the tool is converted into the executable number of the machining program based on the created history table,
The display processing method according to claim 7, wherein a position at which tool life information is displayed on the display unit is determined based on the converted executable number. One of the units is selected from a plurality of units for indicating the life of the tool, and the life value of the tool is set for each tool based on the selected unit.
Each time the tool is used, update the value according to the current tool usage frequency,
Calculate the ratio of the value according to the updated use frequency of the tool to the set life value,
A computer program that can be executed by the tool life management device to execute a process of determining a position at which the life information of each tool is displayed on the display unit based on the calculated ratio. The plurality of units include the use time of the tool, the number of holes to be formed in the work, and the number of executions of the processing program for processing the work,
Update and create a history table that corresponds to the machining program and stores the tool usage time and the number of holes formed in the work every time the work is machined,
When the use time or the number of holes is selected, a value corresponding to the updated current use frequency of the tool is converted into the executable number of the machining program based on the created history table,
The computer program according to claim 9, wherein the computer program causes a process to determine a position at which tool life information is displayed on the display unit based on the converted executable number.

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