JP6387653B2 - Numerical controller - Google Patents

Description

  The present invention relates to a numerical control device that controls a machine tool based on a machining program.

Conventionally, when an abnormality occurs in a machine tool, alarm information to be described later may be notified to a manager of the machine tool (see Patent Document 1).
The alarm notification system described in Patent Document 1 determines the importance of an abnormality that has occurred in a machine tool.

  When the abnormality is of high importance, the alarm notification system notifies the administrator of alarm information. The alarm information includes an abnormality occurrence time, an identification number indicating the type of abnormality, and the like. The administrator instructs the operator of the machine tool to solve the abnormality based on the notified alarm information. At this time, if necessary to resolve the abnormality, the operator manually stops the machine tool.

When the abnormality is low in importance, the alarm notification system does not notify the alarm information. Therefore, the machine tool continues to process the workpiece.
However, when the abnormality has not been resolved even after a predetermined time has elapsed since the occurrence of the abnormality, the alarm notification system treats the abnormality having the low importance in the same manner as the abnormality having the high importance. As a result, alarm information is notified to the administrator.

Machining by a machine tool is controlled in accordance with a computer program for machining a workpiece (hereinafter referred to as a machining program).
2. Description of the Related Art Conventionally, a numerical control device that automatically stops the operation of a machine tool after waiting for the end of execution of a machining program when an abnormality has occurred in a machine tool or a peripheral device of the machine tool has been used.

JP 2005-107788 A

In recent years, machining programs tend to be long. For this reason, when an abnormality has occurred, waiting for the end of execution of the machining program being executed may cause the deterioration of the abnormality or the prolongation of the time required to eliminate the abnormality.
When Patent Document 1 is referred to solve such a problem, the operation of the machine tool is automatically stopped without waiting for the end of execution of the machining program when a predetermined time has elapsed since the occurrence of the abnormality. A numerical control device can be considered.

However, in the alarm notification system described in Patent Document 1, there is only one condition for increasing the importance.
In the case of a configuration in which the operation of the machine tool automatically stops when a predetermined time has elapsed uniformly, there is a possibility that the operation of the machine tool cannot be stopped at an appropriate timing depending on the type of abnormality or type of machining There is. This is because there are cases where the anomaly deteriorates before the predetermined time elapses, and there are cases where the machining of the workpiece can be continued even after the predetermined time elapses.

  The present invention has been made in view of such circumstances, and its main object is to provide a numerical control device that can automatically stop the operation of a machine tool at an appropriate timing when an abnormality has occurred. It is to provide.

The numerical control device according to the present invention includes a control unit that controls the operation of a machine tool that processes a workpiece based on a machining program for workpiece machining, and the control unit has a predetermined abnormality, In the numerical control apparatus having first stop means for stopping the operation of the machine tool by terminating the execution of the machining program at a predetermined timing, the control unit performs the predetermined timing when the abnormality occurs. When the plurality of types of stop determination means for determining whether or not to stop the operation of the machine tool and at least one stop determination means are determined to stop before ending the execution of the machining program, and second stop means for stopping the operation of the machine tool, possess an abnormality counting means for counting an elapsed time from the occurrence of abnormality, the abnormal time measuring means, during processing with respect to the workpiece The elapsed time is continuously measured, and the elapsed time is stopped during non-machining of the workpiece, and one stop determination means is configured such that the time measurement result of the abnormal time measurement means is a threshold value of the elapsed time. If it is above, and wherein Citea Rukoto to determine that stops.

  The numerical control device according to the present invention is characterized in that the control unit further includes setting means for setting the threshold according to the type of abnormality that has occurred.

  The numerical control device according to the present invention further includes a display unit, and the control unit subtracts the time measurement result of the abnormal time measuring unit from the threshold value until the second stop unit stops the operation of the machine tool. It further has stop calculation means for calculating a stop time required for the stop calculation means, and stop display means for displaying the calculation result of the stop calculation means on the display unit.

In the numerical control device according to the present invention, the predetermined timing is when execution of a running machining program ends, and the control unit is executing a machining program at least when the abnormality occurs. Size detection means for detecting the size of the image, wherein one stop determination means determines that the stop is made when the detection result of the size detection means is equal to or larger than a predetermined size. .
The numerical control device according to the present invention includes a control unit that controls the operation of a machine tool that processes a workpiece based on a machining program for workpiece machining, and the control unit has a predetermined abnormality, In the numerical control apparatus having first stop means for stopping the operation of the machine tool by terminating execution of the machining program at a predetermined timing, the predetermined timing is when execution of the machining program being executed is completed. And when the abnormality occurs, the control unit includes at least one stop and a plurality of types of stop determination means for determining whether or not to stop the operation of the machine tool before reaching the predetermined timing. When the determination means determines to stop, the second stop means stops the operation of the machine tool by terminating execution of the machining program, and at least the abnormality occurs A size detecting unit that detects a size of the machining program being executed, and one stop determining unit determines to stop when the detection result of the size detecting unit is equal to or larger than a predetermined size. It is made to do so.

The numerical control device according to the present invention further includes a storage unit that associates and stores the machining program and an end time required from the start to the end of execution of the machining program, and the control unit executes the machining program. A time measuring means for measuring an elapsed time from the start of reading, a reading means for reading out an end time associated with a machining program being executed from the storage unit when at least the abnormality occurs, One stop determination means, further comprising: a time calculation means for calculating a time required to end the execution of the machining program by subtracting a time measurement result of the elapsed time measurement means from an end time read by the reading means. Is characterized in that it is determined to stop when the calculation result of the time calculation means is equal to or greater than a predetermined threshold value.
The numerical control device according to the present invention includes a control unit that controls the operation of a machine tool that processes a workpiece based on a machining program for workpiece machining, and the control unit has a predetermined abnormality, In a numerical control apparatus having first stop means for stopping execution of the machine tool by stopping execution of the machining program at a predetermined timing, the machining program and an end time required from the start to the end of execution of the machining program Are stored in association with each other, and when the abnormality occurs, the control unit determines whether or not to stop the operation of the machine tool before reaching the predetermined timing. When it is determined that the stop determination means and at least one stop determination means are to be stopped, the execution of the machining program is terminated and the operation of the machine tool is stopped. A stop means, an elapsed time measuring means for measuring an elapsed time from the start of execution of the machining program, and an end time associated with a running machining program at least when the abnormality has occurred, Reading means for reading from the storage unit, and time calculating means for calculating the time required to finish execution of the machining program by subtracting the time measurement result of the elapsed time measuring means from the end time read by the reading means. And the one stop determination means is characterized in that it is determined to stop when the calculation result of the time calculation means is a predetermined threshold value or more.

  The numerical control device according to the present invention further includes a display unit, and the control unit further includes an end display unit for displaying the calculation result of the time calculation unit on the display unit.

  In the present invention, when a predetermined abnormality has occurred, the control unit waits until a predetermined timing and then stops the operation of the machine tool (first stop means) or waits until a predetermined timing. Without stopping the operation of the machine tool (second stopping means). The first stop means and the second stop means are properly used according to the determination result of the stop determination means.

The control unit has a plurality of types of stop determination means. In other words, there are multiple types of conditions (hereinafter referred to as stop conditions) for stopping the operation of the machine tool before reaching a predetermined timing. However, when the stop condition is not satisfied, the operation of the machine tool is automatically stopped at a predetermined timing. When at least one kind of stop condition is satisfied, the operation of the machine tool is automatically performed even if the predetermined timing is not reached. Stop.
Therefore, for example, it is possible to apply a plurality of types of stop conditions for one type of predetermined abnormality. Alternatively, with respect to a plurality of types of predetermined abnormalities, it is possible to use different stop conditions for each type of abnormality.

In the present invention, when the elapsed time from the occurrence of an abnormality is equal to or greater than the threshold, the control unit stops the operation of the machine tool without waiting for a predetermined timing.
However, the elapsed time measured at this time is the sum of the time during which the workpiece is processed, and includes the time during which the workpiece is not processed (for example, the time during which the workpiece is moved). Not. This is because, depending on the type of abnormality, the abnormality does not worsen while the workpiece is not processed. As a result, it is possible to appropriately measure the timing at which the operation of the machine tool stops.

In the present invention, when the elapsed time from the occurrence of an abnormality is equal to or greater than the threshold, the control unit stops the operation of the machine tool without waiting for a predetermined timing.
However, the threshold used at this time is set by the setting means in accordance with the type of abnormality that has occurred. For example, an appropriate threshold value associated with the type of abnormality is given to the setting means in advance by an operator. As a result, it is possible to appropriately measure the timing at which the operation of the machine tool stops.

In the present invention, the stop time is displayed. The stop time is the time required for the elapsed time from occurrence of an abnormality to reach a threshold value. This is a measure of the time required for the operation of the machine tool to actually stop when the stop condition is satisfied and the operation of the machine tool stops.
The operator can know the approximate time required for the operation of the machine tool to actually stop by visually recognizing the displayed stop time. That is, the convenience for the operator is improved.

In the present invention, when the size of the machining program being executed is equal to or larger than the predetermined size, the control unit allows the operation of the machine tool without waiting until a predetermined timing (specifically, completion of execution of the machining program). Stop. This is because, if the size of the machining program being executed is equal to or larger than a predetermined size, it is considered that it takes a long time to complete the execution of the machining program.
The determination as to whether or not the size of the machining program being executed is greater than or equal to a predetermined size can be made without delay from the occurrence of an abnormality. Therefore, for example, the operator can start to solve the abnormality without waiting for a predetermined time after the occurrence of the abnormality.

In the present invention, when the time required to complete the execution of the machining program (hereinafter referred to as machining time) is calculated, and the calculation result is equal to or greater than a predetermined threshold, the control unit has a predetermined timing (specifically, The machine tool operation is stopped without waiting for the machining program to finish). This is because, if the machining time is equal to or greater than a predetermined threshold, it is considered that a long time is required until the machining program is completed.
The machining time is obtained by subtracting the elapsed time from the start of the machining program from the end time stored in the storage unit. Here, the end time stored in the storage unit is an actual measurement value or an estimated value of the time required from the start of execution of the machining program to the end thereof.

  The determination as to whether or not the machining time is equal to or greater than a predetermined threshold can be made without any delay from the occurrence of an abnormality. Therefore, for example, the operator can start to solve the abnormality without waiting for a predetermined time after the occurrence of the abnormality.

In the present invention, the processing time is displayed. The machining time is the time required for the elapsed time from the start of execution of the machining program to reach the end time stored in the storage unit. This is a measure of the actual time required to complete the machining program.
The operator can know the standard of the actual time required until the end of execution of the machining program by visually checking the displayed machining time. That is, the convenience for the operator is improved.

  In the numerical control device according to the present invention, there are a plurality of types of stop determination means, and the first stop means and the second stop means are properly used according to the determination result of the stop determination means. Therefore, the operation of the machine tool can be automatically stopped at an appropriate timing when an abnormality has occurred regardless of the type of abnormality or the type of machining. Accordingly, it is possible to suppress the deterioration of the abnormality, the unnecessary processing continuation, the unnecessary processing stop, the prolongation of the time required to resolve the abnormality, and the like.

1 is a perspective view schematically showing the configuration (without a cover) of a machine tool including a numerical control device according to an embodiment of the present invention. 1 is a perspective view schematically showing a configuration (with a cover) of a machine tool. FIG. 3 is a perspective view schematically showing an upper side inside a processing unit included in the machine tool. It is a perspective view which briefly shows the structure (X-axis motor) of the moving part with which a machine tool is provided. It is a perspective view which briefly shows the structure (Y axis motor) of the moving part with which a machine tool is provided. It is a block diagram which shows the structure of the control system of a machine tool. It is a schematic diagram which shows an example of the process program and data which are memorize | stored in the memory | storage part with which a machine tool is provided. It is a timing chart which shows the input / output timing of the various signals regarding the oil supply apparatus with which a machine tool is provided. It is a perspective view which briefly shows the structure of the chip conveyor which is a peripheral device of a machine tool. It is a flowchart which shows the procedure of the process performed by a machine tool. It is a flowchart which shows the procedure of the monitoring process performed with a machine tool. It is a flowchart which shows the procedure of the monitoring process performed with a machine tool. It is a flowchart which shows the procedure of the time-measurement process performed with a machine tool. It is a flowchart which shows the detail of the abnormality determination process procedure performed with a machine tool. It is a flowchart which shows the detail of the abnormality determination process procedure performed with a machine tool. It is a flowchart which shows the procedure of the normal time measuring process performed with a machine tool. It is a flowchart which shows the procedure of the intermittent timing process performed with a machine tool.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. In the following description, up and down, front and rear, and left and right indicated by arrows in the figure are used.

A machine tool 1 shown in FIGS. 1 to 6 includes an apparatus main body 10 and a control device (numerical control device) 2. The control device 2 controls the operation of the machine tool 1 for machining a workpiece by executing a machining program for workpiece machining, and executes a monitoring computer program (hereinafter, referred to as a monitoring program) to detect abnormalities. When this occurs, the work unit 3 described later is stopped at an appropriate timing.
The apparatus main body 10 includes a base 11, a support column 12, a cover 13, and a work unit 3. The machine part 3 includes a machining part 31, a tool changing part 32, a holding part 33, a moving part 34, and an oil supply part 4.

The base 11 has a bed shape with four legs protruding. A holding portion 33 is disposed on the upper portion of the base 11. A column portion 12 is erected on the upper side of the base 11 and on the rear side of the holding portion 33. The base 11 below the holding portion 33 is provided with an opening (not shown) penetrating in the vertical direction.
The base 11 and the support column 12 are provided with a moving unit 34 and an oil supply unit 4.
The support column 12 supports the tool changer 32 and the control device 2. The tool changer 32 is disposed on the front side of the support column 12. The control device 2 is arranged behind the support column 12. Furthermore, the support | pillar part 12 is supporting the process part 31 so that an up-down movement is possible.
The processing unit 31 is disposed on the upper side of the holding unit 33 and in the vicinity of the tool changing unit 32.
The cover 13 has a front wall, left and right sides, and a rear wall, and surrounds the upper side of the base 11. The cover 13 suppresses scattering of cutting waste generated during the cutting of the workpiece around the machine tool 1.

Each part of the work part 3 will be described with reference to FIGS.
One tool 310 is detachably attached to the processing unit 31. The tool 310 mounted on the processing unit 31 is rotated by driving the spindle motor 311.
The tool changer 32 has a tool magazine 321. The tool magazine 321 has a disk shape that can rotate in the circumferential direction, and is rotated by driving of the magazine motor 322. A plurality of tools 310 are detachably attached to the tool magazine 321.
The holding unit 33 is a so-called table and holds a workpiece (not shown).

The moving unit 34 includes an X-axis motor 341, an X-axis ball screw 345, and X-axis guide rails 347 and 347, a Y-axis motor 342, a Y-axis ball screw 346, Y-axis guide rails 348 and 348, and a Z-axis motor. 343 and a Z-axis ball screw 349, and Z-axis guide rails 340 and 340.
The X-axis guide rails 347 and 347 are laid in the left-right direction. The X-axis ball screw 345 is connected to the X-axis motor 341, and converts the rotational motion of the X-axis motor 341 into a linear motion in the left-right direction. This linear motion is transmitted to the holding unit 33.
The Y-axis guide rails 348 and 348 are laid in the left-right direction. The Y-axis ball screw 346 is connected to the Y-axis motor 342 and converts the rotational motion of the Y-axis motor 342 into a linear motion in the front-rear direction. This linear motion is transmitted to the holding unit 33.
The holding unit 33 is guided by the X-axis guide rails 347 and 347 and the Y-axis guide rails 348 and 348 by the drive of the X-axis motor 341 and the Y-axis motor 342, respectively, and moves back and forth on the virtual plane. To do.

  The Z-axis guide rails 340 and 340 are laid in the vertical direction. The Z-axis ball screw 349 converts the rotary motion of the Z-axis motor 343 into a vertical linear motion. This linear motion is transmitted to the processing unit 31. The processing unit 31 is guided by the Z-axis guide rails 340 and 340 by the drive of the Z-axis motor 343 and moves in the vertical direction.

When the processing unit 31 moves upward, the tool 310 attached to the processing unit 31 is separated from the processing execution position at which processing on the workpiece is executed. As the processing unit 31 moves further upward, the tool 310 mounted on the processing unit 31 is detached from the processing unit 31 and mounted on the tool magazine 321.
By rotating the tool magazine 321, one of the plurality of tools 310 mounted on the tool magazine 321 is sent to the tool change position in the circumferential direction of the tool magazine 321.

When the processing unit 31 moves downward, the tool 310 attached to the tool magazine 321 is detached from the tool magazine 321 and attached to the processing unit 31. As the processing unit 31 further moves downward, the tool 310 attached to the processing unit 31 approaches the processing execution position.
The workpiece is machined (for example, cut) by the rotation of the tool 310 at the machining execution position. If the tool 310 is not in the machining execution position, or if the tool 310 is not rotating, the workpiece is not machined (non-machining). The movement of the holding unit 33 by the moving unit 34 is performed during non-machining of the workpiece.

The oil supply unit 4 includes an oil tank 41, an oil supply pump 42, an oil supply pipe 43, an oil amount detection unit 44, and a pressure detection unit 45.
Lubricating oil stored in the oil tank 41 is pressurized by the oil supply pump 42, passes through the oil supply pipe 43, and moves to the moving unit 34 (specifically, the X-axis ball screw 345, the Y-axis ball screw 346, and the X-axis guide rail). 347, 347, Y-axis guide rails 348, 348, Z-axis ball screw 349, Z-axis guide rails 340, 340, etc.). Oil supply by the oil supply unit 4 is performed intermittently (see FIG. 8). As the lubricating oil, grease may be used.

The oil amount detection unit 44 uses a float switch. The oil amount detection unit 44 is turned on when the remaining amount of lubricating oil stored in the oil tank 41 is sufficient (when the oil level is high). At this time, a remaining amount signal indicating that the remaining amount of lubricating oil is sufficient is output to the control device 2. When the remaining amount of lubricating oil stored in the oil tank 41 is insufficient (when the oil level is low), the oil amount detection unit 44 is turned off. Therefore, the remaining amount signal is not output.
The pressure detector 45 uses a pressure switch. The pressure detection unit 45 is turned on by being pressurized by the lubricating oil when the lubricating oil passes through the oil supply pipe 43. At this time, an oil supply signal indicating that the oil supply to the moving unit 34 is being performed is output to the control device 2. When the lubricating oil does not pass through the oil supply pipe 43, the pressure detection unit 45 is turned off. Therefore, no refueling signal is output.

The control device 2 includes a housing 20, a control unit 21, a storage unit 22, an operation unit 23, a display unit 24, and an interface unit 25.
The housing 20 is supported by the support column 12. The housing 20 accommodates a control unit 21, a storage unit 22, and an interface unit 25. A door (not shown) is provided at the rear of the housing 20.
The operation unit 23 and the display unit 24 are arranged on the front wall of the cover 13.

The operation unit 23 includes a switch and a dial that should be operated by the operator.
The operator gives an instruction to start machining the workpiece to the machine tool 1 by operating the operation unit 23. At this time, an instruction signal for instructing start of machining of the workpiece is output from the operation unit 23 to the control unit 21.
The operator gives various data (described later) to the machine tool 1 by operating the operation unit 23.

  The display unit 24 includes a lamp, a 7-segment display, a liquid crystal display, etc. (each not shown). The display unit 24 displays the operating status of the machine tool 1 or a message to the operator. The driving situation or message is expressed using the lighting / extinguishing / flashing of the lamp, the number indicated by the 7-segment display, or the characters or symbols indicated by the liquid crystal display.

The chip conveyor 5 is connected to the interface unit 25. A normal operation signal indicating that the chip conveyor 5 is operating normally is transmitted from the chip conveyor 5.
A personal computer (not shown) is connected to the interface unit 25. From this personal computer, a machining program to be executed by the machine tool 1 is transmitted.
The interface unit 25 is provided with a slot in which a portable recording medium (for example, a memory card) is mounted.

  The storage unit 22 includes a ROM, a RAM, an auxiliary storage device, and / or a recording medium mounted in a slot of the interface unit 25. The storage unit 22 stores a monitoring program and default data in advance. In addition, the storage unit 22 stores data given through the operation unit 23 and a machining program received through the interface unit 25. Furthermore, the storage unit 22 stores data (for example, various flags) necessary for executing the monitoring program or the machining program. This data is generated by the control unit 21 at an appropriate timing.

Hereinafter, it is assumed that a plurality of machining programs are stored in the storage unit 22 in advance.
A unique program identification number is given to the machining program. Among the plurality of machining programs stored in the storage unit 22, what is actually executed is a machining program indicated by the program identification number designated by the operator. The operator gives the machine tool 1 a program identification number of a desired machining program via the operation unit 23.

  The machining program includes a plurality of blocks for controlling the movement of the workpiece, the machining of the workpiece, the oil supply, the exchange of the tool 310, and the like. Each block is executed one line at a time. For example, when one block is executed, the tool 310 approaches the machining execution position, and when another block is executed, the tool 310 acts on the workpiece.

The control unit 21 is a control center of the machine tool 1 and controls the operation of each unit of the machine tool 1 according to a monitoring program and a machining program stored in the storage unit 22.
The control unit 21 is input with a remaining amount signal from the oil amount detection unit 44, an oil supply signal from the pressure detection unit 45, and a normal operation signal received from the chip conveyor 5.

FIG. 10 is a flowchart illustrating a processing procedure executed by the machine tool 1. The control unit 21 executes the machining process according to the machining program indicated by the program identification number designated by the operator.
The control unit 21 executes a block for one line included in the machining program (S11).
After the processing of S11 is completed, the control unit 21 determines whether or not the block executed in S11 is the block of the last row (S12). If it is not the last row (NO in S12), a severe abnormality flag described later Alternatively, it is determined whether or not a special abnormality flag is set (S13). That is, the process of S13 is executed every time execution of a block for one row is completed.

If neither the severe abnormality flag nor the special abnormality flag is set (NO in S13), the control unit 11 returns the process to S11.
By repeating the processes of S11 to S13 without determining YES in S13, the blocks included in the machining program are executed from the first line to the last line in order.

If the block executed in S11 is the block in the last row (YES in S12), a last row flag indicating that the execution of the block in the last row has been completed is set (S14). The set last line flag means the end of execution of the machining program.
After the process of S14 ends, the control unit 21 ends the processing process.

  If at least one of the severe abnormality flag and the special abnormality flag is set (YES in S13), the machining program being executed is forcibly terminated by interruption. At this time, the control unit 21 sets a forced end flag that means the forced end of the running machining program (S15), and then ends the machining process.

In the process of S11, the control unit 21 controls, for example, the operations of the main shaft motor 311, the magazine motor 322, the X axis motor 341, the Y axis motor 342, or the Z axis motor 343. Further, the control unit 21 controls fuel supply by the fuel supply unit 4.
The oil supply control by the oil supply unit 4 is specifically a control of the operation of the oil supply pump 42. The control unit 21 starts outputting an oil supply control signal when the oil supply pump 42 is turned on. When turning off the oil supply pump 42, the control unit 21 ends the output of the oil supply control signal.

FIG. 8 shows the output timing of the oil supply control signal to the oil supply pump 42 by the control unit 21 and the input timing of the oil supply signal from the pressure detection unit 45 to the control unit 21.
Time T10 is the time when the previous refueling is finished.

The control unit 21 starts outputting the refueling control signal at time T11 when the predetermined pause time To2 has elapsed from time T10. As a result, the oil supply pump 42 is turned on.
The oil pump 42 that has been turned on starts to pump out the lubricating oil from the oil tank 41. At time T12 after time T11, the pumped lubricating oil reaches the oil supply pipe 43, and the pressure detector 45 is turned on. Thereafter, an oil supply signal is input to the control unit 21, and lubricating oil is supplied to the moving unit 34.
The time T12 can be regarded as a point in time when the lubricating oil starts to be supplied to the moving unit 34.

The control unit 21 ends the output of the fuel supply control signal at time T13 when the predetermined supply time To1 has elapsed from time T12. As a result, the oil supply pump 42 is turned off. In other words, the control unit 21 ends the refueling at the time T13.
After the oil pump 42 is turned off, the pressure detector 45 is turned off (at time T14). Thereafter, the oil supply signal is not input to the control unit 21 and the supply of the lubricating oil to the moving unit 34 is stopped.

The control unit 21 starts outputting the fuel supply control signal at time T21 when a predetermined pause time To2 has elapsed from time T13. As a result, the oil supply pump 42 is turned on. At time T22 after time T21, the pressure detection unit 45 is turned on, and an oil supply signal starts to be input to the control unit 21.
As described above, intermittent fuel supply to the moving unit 34 is performed.
The storage unit 22 stores default data as the predetermined supply time To1 and the predetermined pause time To2. However, when data to be the predetermined supply time To1 or the predetermined pause time To2 is given via the operation unit 23, this data is stored in the storage unit 22, and is used preferentially over the default one.

Next, the chip conveyor 5 will be described with reference to FIG.
The chip conveyor 5 collects cutting waste generated at the time of cutting the workpiece in the machine tool 1 and coolant used at the time of cutting. The cutting waste and the coolant fall to the lower side of the base 11 through an opening provided in the base 11 of the machine tool 1.

The chip conveyor 5 includes a base 51, support columns 52, a horizontal housing 53, an inclined housing 54, and a control device 55.
A support column 52 is erected on the upper and rear side of the base 51. The support column 52 supports the control device 55. The control device 55 is arranged on the upper side and the rear side of the support column 52.
The horizontal housing 53 is long in the front-rear direction. The horizontal housing 53 is disposed below the base 11 of the machine tool 1. The upper part of the horizontal casing 53 is open. The cutting waste and coolant that have fallen from the machine tool 1 are accommodated in the horizontal casing 53 through an open portion of the horizontal casing 53. The horizontal housing 53 functions as cutting waste and coolant receiver. The horizontal casing 53 protrudes from the front portion of the base 51.

The inclined housing 54 is arranged in a rearward inclined posture that stands up behind the machine tool 1. The lower end portion of the inclined housing 54 is located at the upper part of the base 51, and the upper end portion of the inclined housing 54 is supported by the support column 52 on the upper front side of the support column 52. An open portion (not shown) is provided at the upper rear portion of the inclined housing 54.
Below the open part of the inclined housing 54, a waste receptacle (not shown) is arranged.
A hinge conveyor (not shown) is arranged in the horizontal casing 53, the base 51, and the inclined casing 54. The hinge conveyor is driven by a first motor 561 supported by the support column 52.

The cutting waste accommodated in the horizontal housing 53 is transferred by the hinge conveyor and falls to the waste receptacle through the open portion of the inclined housing 54.
The coolant accommodated in the horizontal casing 53 drops downward from the gap of the hinge conveyor.
A scraper conveyor (not shown) is disposed below the hinge conveyor. The scraper conveyor is driven by a second motor 562 supported by the support column 52.

  The coolant dripped below the hinge conveyor is transferred by the scraper conveyor and stored in a coolant tank 563 arranged inside the base 51. The coolant stored in the coolant tank 563 is pumped out by the coolant pump 564 disposed on the base 51, filtered by a filter (not shown), and then returned to the machine tool 1.

The operation of each part of the chip conveyor 5 is controlled by the control device 55.
The control device 55 is provided with a relay (not shown). When this relay is turned on, power is supplied to each part of the chip conveyor 5, and the chip conveyor 5 operates. At this time, a normal operation signal is transmitted to the machine tool 1.
When a failure of the relay of the control device 55 or a disconnection of a wiring portion (not shown) connected to the relay occurs, the chip conveyor 5 is not supplied with power. Therefore, the chip conveyor 5 does not operate. At this time, transmission of the normal operation signal to the machine tool 1 is cut off.

A countermeasure when an abnormality occurs in the machine tool 1 will be described.
When an abnormality occurs, countermeasures are taken according to the monitoring program.
In the present embodiment, when a minor abnormality occurs, a minor abnormality flag is set in association with the type of abnormality that has occurred. When the minor abnormality flag is set, the control unit 21 continues to display the error message on the display unit 24 and executes the machining program being executed up to the block on the last line. Therefore, the machining for the workpiece is completed.

  When a serious abnormality occurs, a severe abnormality flag is set in association with the type of abnormality that has occurred. When the severe abnormality flag is set, the control unit 21 continues to display an error message on the display unit 24, waits for the execution of the block being executed to end, and forcibly ends the machining program with an interrupt. The machine part 3 is turned off to make it inoperable (hereinafter referred to as stop of the machine part 3). Therefore, the machining for the workpiece is stopped.

When a moderate abnormality occurs, a general abnormality flag is set in association with the type of abnormality that has occurred, and then a special abnormality flag is further set when a stop condition is satisfied. There are multiple stop conditions.
If the general abnormality flag is set and the special abnormality flag is not set, the control unit 21 continues to display an error message on the display unit 24 and waits for the execution of the machining program being executed before the machining unit 3. Stop. Therefore, the machining for the workpiece is completed.

  When both the general abnormality flag and the special abnormality flag are set, the control unit 21 continues to display an error message on the display unit 24, and after waiting for the execution of the block being executed to end, the machining program is forcibly interrupted. Then, the work unit 3 is stopped. Therefore, the machining for the workpiece is stopped.

Various abnormality flags are reset when the corresponding abnormality is resolved. For this reason, if the abnormality is resolved while waiting for the execution of the machining program or block being executed to be completed, it is determined NO in the processing of S13, S51, S55, or S59, which will be described later. Neither the end nor the stop of the machine part 3 is performed.
Regardless of the importance of the abnormality, the display of the error message is continued until the corresponding abnormality flag is reset. Here, the error message uses, for example, an abnormality identification number indicating the type of abnormality that has occurred.
Hereinafter, description of resetting various abnormality flags resulting from the elimination of the abnormality will be omitted.

  In this embodiment, regardless of whether the severe abnormality flag or the special abnormality flag is set, the machine section 3 stops after the execution of the block for one line is completed. However, the present invention is not limited to this. Absent. For example, if a severe abnormality flag is set, execution of a block for one line ends, and if a special abnormality flag is set, execution of a block for multiple lines ends. The work unit 3 may stop. In this case, when a serious abnormality occurs, the machining of the workpiece is immediately stopped, but when the medium abnormality occurs and the stop condition is satisfied, the machining of the workpiece can be stopped after one paragraph. .

In addition, when a slight abnormality has occurred, when even one stop condition is satisfied, the control unit 21 stops the machining unit 3 after waiting for the execution of the machining program being executed (or A configuration in which the machining program is forcibly terminated by interruption and then the machining unit 3 is stopped after waiting for the completion of execution of the block being executed is also possible.
Further, when one of the stop conditions is satisfied when a serious abnormality has occurred, the control unit 21 forcibly terminates the machining program with an interrupt without waiting for even the completion of execution of the block being executed, Furthermore, the structure which stops the work part 3 may be sufficient.

In the present embodiment, examples of the abnormality relating to the oil supply unit 4 and the abnormality relating to the chip conveyor 5 are given as medium abnormality.
Moreover, in this Embodiment, four types of stop conditions are illustrated. The stop condition is for determining whether or not to stop the machine part 3 before reaching a predetermined timing (end of execution of the machining program in the present embodiment) when a moderate abnormality has occurred. It is. When at least one kind of stop condition is satisfied, the working unit 3 automatically stops.

The first type of condition is used when an abnormality relating to the oil supply unit 4 has occurred, and the second type of condition is used when an abnormality relating to the chip conveyor 5 has occurred.
The first type and the second type are the same in that the elapsed time from the occurrence of abnormality is equal to or greater than a threshold value.

Next, the difference between the two conditions will be described.
The control unit 21 sets a threshold value for elapsed time. This threshold value is different between the first type condition and the second type condition.
More specifically, when an abnormality relating to the fuel supply unit 4 has occurred, the control unit 21 sets the predetermined pause time To2 as a threshold value. When an abnormality relating to the chip conveyor 5 has occurred, the control unit 21 sets a threshold value that is stored in advance in the storage unit 22 as a threshold value for the elapsed time (hereinafter referred to as a predetermined elapsed time).
The storage unit 22 stores default data as the predetermined elapsed time. However, when data that should be the predetermined elapsed time is given via the operation unit 23, this data is stored in the storage unit 22, and is used preferentially over the default one.

  The elapsed time measuring procedure differs between the first type of condition and the second type of condition. Specifically, when an abnormality relating to the fuel supply unit 4 has occurred, the elapsed time is continuously counted from the time of occurrence of the abnormality according to a normal timing process shown in FIG. When an abnormality relating to the chip conveyor 5 has occurred, the elapsed time is intermittently counted according to the intermittent timing process shown in FIG. 17 described later.

The third condition is that the size of the machining program being executed is equal to or larger than a predetermined size.
The size of the machining program is a storage capacity that the machining program occupies in the storage unit 22. It is estimated that the larger the size of the machining program being executed, the longer it takes to complete the execution of the machining program. The size of the machining program being executed may be the number of blocks.
The storage unit 22 stores a predetermined size in advance. This is a default one or given through the operation unit 23.

The fourth type of condition is that the processing time is equal to or greater than a predetermined threshold.
The machining time is the time required to finish the machining program. The machining time is obtained by calculation. Specifically, the machining time can be obtained by subtracting the elapsed time from the start of execution of the machining program from the end time described later.
The storage unit 22 stores a predetermined threshold value in advance. This is a default one or given through the operation unit 23.

The storage unit 22 stores a time table 221 in which a program identification number and an end time are associated in order to calculate a machining time. The end time is an actual measurement value of the time from the start of execution of the machining program indicated by the program identification number to the end of execution. This is timed by the control unit 21 and stored in the storage unit 22 when the machining program is executed.
The end time may be an estimated value or an average value of actually measured values.
In addition, regarding a machining program that has not been executed yet, data to be the end time may be provided via the operation unit 23. Alternatively, with respect to a machining program that has not been executed yet, a configuration may be adopted in which success or failure of the fourth type of condition is not determined until the end time measurement of the machining program is completed.

Next, the abnormality regarding the oil supply part 4 is demonstrated.
Specifically, the abnormality relating to the oil supply unit 4 is one of the following three types of abnormality.
The first abnormality is that the remaining amount signal is not input from the oil amount detection unit 44 to the control unit 21. This is because the remaining amount of the lubricating oil stored in the oil tank 41 is insufficient, or the oil amount detection unit 44 is broken.

The second abnormality is that the fuel supply signal is not input to the control unit 21 even if the predetermined monitoring time To3 has elapsed after the control unit 21 outputs the fuel supply control signal (see FIG. 8). The cause of this is a failure of the oil supply pump 42 or the pressure detection unit 45 or a breakage of the oil supply pipe 43.
The third abnormality is that the fuel supply signal is input to the control unit 21 even after the predetermined monitoring time To4 has elapsed since the control unit 21 stopped outputting the fuel supply control signal (see FIG. 8). The cause is a failure of the oil supply pump 42 or the pressure detection unit 45 or the like.
When an abnormality relating to the oil supply unit 4 occurs, intermittent oil supply to the moving unit 34 is not normally performed.
The storage unit 22 stores a predetermined monitoring time To3 and a predetermined monitoring time To4 in advance. This is a default one or given through the operation unit 23. The predetermined monitoring time To3 and the predetermined monitoring time To4 may be the same or different.

As described above, when an abnormality relating to the fuel supply unit 4 has occurred, the predetermined pause time To2 is used as the threshold for the elapsed time when determining whether or not the elapsed time from the occurrence of the abnormality is greater than or equal to the threshold. It is done.
This is because the oil supply to the moving unit 34 is intermittently performed even in normal times. That is, it is considered that there is no particular problem even if the processing on the workpiece is continued without refueling until the predetermined downtime To2 elapses after the abnormality related to the oil supply section 4 occurs.

If the workpiece is still being processed even after the predetermined rest time To2 has elapsed since an abnormality relating to the oil supply unit 4 has occurred, an abnormality may also occur in the moving unit 34 (that is, the abnormality will worsen). There is.
If the predetermined elapsed time stored in the storage unit 22 is shorter than the predetermined pause time To2, the predetermined elapsed time may be set as a threshold for the elapsed time instead of the predetermined pause time To2.

Next, abnormality relating to the chip conveyor 5 will be described.
The abnormality relating to the chip conveyor 5 is that a normal operation signal is not input to the control unit 21. This is because the chip conveyor 5 is not operating.
When the chip conveyor 5 is not operating, the cutting waste and coolant that have dropped from the machine tool 1 are not properly disposed of. A particular problem in this case is that the cutting waste dropped from the machine tool 1 accumulates in the horizontal casing 53 of the chip conveyor 5 and enters the machine tool 1.

However, since the accumulated cutting waste does not reach the machine tool 1 until a predetermined elapsed time has elapsed since the occurrence of the abnormality related to the chip conveyor 5, even if the cutting process on the workpiece is continued, there is no particular problem. It is not considered.
Even if a predetermined elapsed time has elapsed since the occurrence of the abnormality relating to the chip conveyor 5, if the cutting of the workpiece is still continued, the machine tool 1 may also become abnormal (that is, the abnormality is worsened). .

While the workpiece is not being cut by the machine tool 1, no cutting waste is generated, so the abnormality does not deteriorate. For this reason, only while the cutting process is being performed (while the tool 310 is acting on the workpiece), the elapsed time from the occurrence of the abnormality relating to the chip conveyor 5 is measured, and the cutting process is performed. While there is no time (before and after the tool 310 is acting on the workpiece), the elapsed time is stopped. In other words, the elapsed time is measured intermittently.
If the elapsed time is continuously counted even when the cutting process is not performed, there is a high possibility that the cutting of the workpiece can be continued even after the elapsed time reaches the predetermined elapsed time.

FIG. 11 and FIG. 12 are flowcharts showing the procedure of the monitoring process executed by the machine tool 1. The control unit 21 executes monitoring processing according to the monitoring program stored in the storage unit 22.
The worker gives various data (for example, a program identification number, a predetermined pause time To2, or a predetermined elapsed time) to the machine tool 1. Next, the operator gives a machining start instruction to the workpiece by operating the operation unit 23.
Note that the operator may instruct the start of machining on the workpiece without providing data. In this case, in the machine tool 1, data stored in the storage unit 22 (default data or data given before the previous time) is used.

As shown in FIG. 11, the control unit 21 determines whether or not data has been received via the operation unit 23 (S31).
When data is received (YES in S31), the control unit 21 stores the received data in the storage unit 22 (S32).
After the process of S32 is completed or when various data are not received (NO in S31), the control unit 21 determines whether or not an instruction signal is input from the operation unit 23 (S33).
If the instruction signal has not yet been input (NO in S33), the machining start instruction for the workpiece has not been given yet. For this reason, the control part 21 returns a process to S31.

  When the instruction signal is input (YES in S33), since the machining start instruction for the workpiece is given, the control unit 21 determines the above-described final line flag, minor abnormality flag, severe abnormality flag, general abnormality flag, and special abnormality. Various flags including the flag are reset (S34).

The control unit 21 starts executing the machining program indicated by the program identification number designated by the worker (S35). As a result of the process of S35, the processing shown in FIG. 10 is executed in parallel with the execution of the monitoring process shown in FIGS. Hereinafter, the machining program started to be executed in S35 is referred to as a running machining program.
Subsequently, the control part 21 starts execution of the progress timing process shown in FIG. 13 described later (S36). In the elapsed time measurement process, the elapsed time since the execution of the machining program being executed is counted in parallel with the execution of the monitoring process.

The control unit 21 executes abnormality determination processing shown in FIGS. 14 and 15 described later (S37).
In the abnormality determination process, when a serious abnormality has occurred, a serious abnormality flag is set. If a minor abnormality has occurred, a minor abnormality flag is set. If a moderate abnormality has occurred, the general abnormality flag is set. A special abnormality flag is set if the stop condition is satisfied under the occurrence of a medium abnormality.

After the process of S37 is completed, the control unit 21 determines whether or not the severe abnormality flag is set as shown in FIG. 12 (S51).
When the severe abnormality flag is set (YES in S51), the control unit 21 determines whether or not the forcible end flag is set (S52). When it is not set yet (NO in S52), S51 Execute the process again.
When the forced end flag is set (YES in S52), the control unit 21 stops the working unit 3 (S53). As a result of the above, the machining program being executed is forcibly terminated by interruption when the execution of the block for one line is completed, and the machine tool 3 automatically stops.
Finally, the control unit 21 sets a timing end flag that means to end the elapsed time counting process (S54), and ends the monitoring process.

When the severe abnormality flag is not set (NO in S51), the control unit 21 determines whether or not the special abnormality flag is set (S55).
When the special abnormality flag is set (YES in S55), the control unit 21 moves the process to S52.
If the special abnormality flag has not been set yet (NO in S55), the control unit 21 determines whether or not the last line flag has been set (S56).

When the last line flag is set (YES in S56), the control unit 21 sets a time measurement end flag (S57). As a result, the elapsed time process started in S36 is completed. Next, the control unit 21 stores the time measurement result of the elapsed time measurement process in the time table 221 of the storage unit 22 in association with the same program identification number as the program identification number of the machining program being executed (S58). In other words, in the process of S58, the actual measurement value of the time required from the start of the machining program being executed to the end thereof is stored as the end time.
The control unit 21 determines whether or not the general abnormality flag is set (S59).
When the general abnormality flag is set (YES in S59), the control unit 21 stops the working unit 3 (S60). As a result, the machining unit 3 automatically stops after the machining program being executed is finished.

When the last line flag is not set (NO in S56), the control unit 21 returns the process to S37 shown in FIG.
As a result, the machining for the workpiece is continued regardless of whether the general abnormality flag or the minor abnormality flag is set.
On the other hand, when the general abnormality flag is not set (NO in S59), the control unit 21 returns the process to S31 shown in FIG. Thereafter, it is possible to continuously process a new workpiece.

The progress timing process in S36 will be described in detail.
FIG. 13 is a flowchart showing the procedure of the elapsed time measurement process executed by the machine tool 1.
First, the control unit 21 resets the elapsed time in association with the program identification number of the machining program being executed (S71). The control unit 21 resets the clock counter (clock counting variable) in association with the program identification number of the machining program being executed (S72). Here, the resetting of the elapsed time (or clock counter) is to store the elapsed time “0” (or clock counter “0”) in the storage unit 22.
Next, every time one clock is input, the control unit 21 starts a process of continuously incrementing the clock counter by “1” (S73).

The control unit 21 determines whether or not the count result of the clock counter is equal to or greater than the predetermined number (S74). If the count result of the clock counter is less than the predetermined number (NO in S74), the process of S74 is performed again. Execute.
When the count result of the clock counter is equal to or greater than the predetermined number (YES in S74), the control unit 21 resets the clock counter (S75) and associates it with the program identification number of the machining program being executed in the storage unit 22. The time measurement result of a certain elapsed time is incremented by unit time (for example, 1 second) (S76).

The control unit 21 reads the end time stored in the time table 221 in association with the same program identification number as the program identification number of the machining program being executed (S77), and the elapsed time incremented in S76 from the read end time. Is subtracted to calculate the machining time associated with the machining program being executed (S78).
There is a low possibility that the calculation result in S78 and the actual time required until the execution of the machining program being executed is the same. However, it is unlikely that they are significantly different. Therefore, there is no particular problem even if the calculation result in S78 is used as a guideline for the time required until the execution of the machining program is actually finished.

The control unit 21 controls the display unit 24 to display the machining time that is the calculation result of S78 (S79).
If the operator visually recognizes the display unit 24, a guideline for the time required to finish the execution of the machining program (the time required for the machine unit 3 to stop when a moderate abnormality has occurred) is provided. I can know. As a result, the convenience for the operator is improved.

The control unit 21 determines whether or not the timing end flag is set (S80). If the timing end flag is not yet set (NO in S80), the process returns to S74.
If the time measurement end flag is set (YES in S80), the control unit 21 ends the increment of the clock counter started in S73 (S81), and ends the elapsed time measurement process.

The abnormality determination process in S37 will be described in detail.
14 and 15 are flowcharts showing details of the abnormality determination processing procedure executed by the machine tool 1.
As shown in FIG. 14, the control unit 21 determines whether or not a severe abnormality has occurred (S91).
The case where the serious abnormality has occurred is, for example, a case where various motors of the working unit 3 do not operate.
If a severe abnormality has occurred (YES in S91), the control unit 21 sets a severe abnormality flag in association with the abnormality determined to have occurred in S91 (S92), and controls the display unit 24. Then, an error message regarding the occurring abnormality is displayed (S93).
When the process of S93 ends, the control unit 21 ends the abnormality occurrence process and returns to the monitoring process shown in FIG.

When a serious abnormality has not occurred (NO in S91), the control unit 21 determines whether or not a minor abnormality has occurred (S94).
The case where the minor abnormality has occurred is, for example, a case where the lamp to be lit on the display unit 24 is not lit.
If a minor abnormality has not occurred (NO in S94), the control unit 21 moves the process to S98 described later.

If a minor abnormality has occurred (YES in S94), the control unit 21 determines whether a minor abnormality flag associated with the occurring abnormality has already been set (S95).
When the minor abnormality flag associated with the occurring abnormality has not yet been set (NO in S95), the control unit 21 sets the minor abnormality flag in association with the occurring abnormality (S96), and the display unit 24 is controlled to display an error message regarding the abnormality that has occurred (S97).
When the process of S97 is completed, or when the minor abnormality flag associated with the occurring abnormality has already been set (YES in S95), the control unit 21 moves the process to the next S98.

The control unit 21 determines whether or not a medium level abnormality has occurred (S98). If no abnormality has occurred (NO in S98), the control unit 21 ends the abnormality generation process and returns to the monitoring process shown in FIG. .
If a moderate abnormality has occurred (YES in S98), the control unit 21 determines whether the general abnormality flag has already been set in association with the occurring abnormality (S99).
If the general abnormality flag associated with the occurring abnormality has already been set (YES in S99), the control unit 21 ends the abnormality occurrence process and returns to the monitoring process shown in FIG.

  If the general abnormality flag associated with the occurring abnormality is not set (NO in S99), the control unit 21 sets the general abnormality flag in association with the occurring abnormality (S100), and the display unit 24 To display an error message relating to the abnormality that has occurred (S101).

As shown in FIG. 15, the control unit 21 detects the size of the machining program being executed (S111). Specifically, the control unit 21 in S111 scans the storage unit 22 and detects the storage capacity of the machining program being executed. Note that the control unit 21 appropriately increases or decreases the actual detection value according to the progress status of the machining program being executed or whether or not the execution machining program includes a repeated block. It is good.
After the process of S111 is completed, the control unit 21 determines whether or not the detection result in S111 (that is, the size of the machining program being executed) is greater than or equal to a predetermined size (S112).

When the size of the machining program being executed is equal to or larger than the predetermined size (YES in S112), the control unit 21 sets a special abnormality flag in association with the abnormality determined to have occurred in S98 (S113).
When the process of S113 ends, the control unit 21 ends the abnormality occurrence process and returns to the monitoring process illustrated in FIG.

If the size of the machining program being executed is less than the predetermined size (NO in S112), the control unit 21 stores the latest value of the calculation result (ie, machining time) in S78 shown in FIG. It is determined whether or not the predetermined threshold value is exceeded (S114).
If the processing time is equal to or greater than the predetermined threshold (YES in S114), the control unit 21 moves the process to S113.

When the machining time is less than the predetermined threshold (NO in S114), the control unit 21 determines whether or not the abnormality determined to have occurred in S98 is an abnormality related to the fuel supply unit 4 (S115).
When an abnormality relating to the fueling unit 4 has occurred (YES in S115), the control unit 21 sets a predetermined pause time To2 as a threshold value for the elapsed time related to the fueling unit 4 (S116), and is shown in FIG. Timekeeping processing is started (S117). In the normal time measurement process, the elapsed time after the occurrence of the abnormality related to the fuel supply unit 4 is counted in parallel with the execution of the monitoring process.

If an abnormality relating to the oil supply unit 4 has not occurred (NO in S115), since an abnormality relating to the chip conveyor 5 has occurred, the control unit 21 sets a predetermined elapsed time as a threshold for the elapsed time relating to the chip conveyor 5. (S118), the intermittent timing process shown in FIG. 17 described later is started (S119). In the intermittent timing process, in parallel with the execution of the monitoring process, the elapsed time after the occurrence of the abnormality relating to the chip conveyor 5 is intermittently counted.
After the process of S117 or S119 ends, the control unit 21 ends the abnormality occurrence process and returns to the monitoring process shown in FIG.

FIG. 16 is a flowchart showing a procedure of normal time measurement processing executed by the machine tool 1.
The control unit 21 resets the elapsed time associated with the abnormality related to the fuel supply unit 4 (S131), resets the clock counter (S132), and starts the increment processing of the clock counter (similarly to S71 to S76 shown in FIG. 13). In step S133, the count result of the clock counter is determined (S134), the clock counter is reset (S135), and the elapsed time is incremented (S136).
The control unit 21 subtracts the elapsed time incremented in S136 (that is, the elapsed time since the occurrence of the abnormality related to the fuel supply unit 4) from the threshold value set in S116 (that is, the predetermined pause time To2). The time required for the unit 3 to automatically stop (stop time) is calculated (S137).

Further, the control unit 21 controls the display unit 24 to display the stop time that is the calculation result of S137 (S138).
If the operator visually recognizes the display unit 24, the time required until the machine unit 3 automatically stops can be known. As a result, the convenience for the operator is improved. For example, an operator who determines that the stop time is too long may manually stop the working unit 3.
Note that both the stop time and the machining time may be displayed, or only one of them may be displayed.

Next, the control unit 21 determines whether or not the elapsed time incremented in S136 is equal to or greater than the threshold set in S116 (S139).
When the elapsed time from the occurrence of the abnormality is equal to or greater than the threshold (YES in S139), the control unit 21 sets a special abnormality flag in association with the abnormality related to the fuel supply unit 4 (S140).

After the completion of the process of S140 or when the elapsed time from the occurrence of the abnormality is less than the threshold (NO in S139), the control unit 21 determines whether or not the time measurement end flag is set (S141).
If the timing end flag has not been set yet (NO in S141), the control unit 21 returns the process to S134.
If the time measurement end flag is set (YES in S141), the control unit 21 ends the increment of the clock counter started in S133 (S142), and ends the normal time measurement process.

FIG. 17 is a flowchart showing a procedure of intermittent timing processing executed by the machine tool 1.
The control unit 21 resets the elapsed time associated with the abnormality relating to the chip conveyor 5 (S151) in the same manner as S71 to S75 shown in FIG. 13 or S131 to S135 shown in FIG. ), Resetting the clock counter (S152), starting the increment processing of the clock counter (S153), determining the counting result of the clock counter (S154), and resetting the clock counter (S155).
Next, the control unit 21 determines whether the processing unit 31 is performing cutting (S156).
When cutting is being performed in the processing unit 31 (YES in S156), the control unit 21 increments the time measurement result of the elapsed time associated with the abnormality related to the chip conveyor 5 (S157).

Next, the control unit 21 calculates the stop time by subtracting the elapsed time incremented in S157 from the threshold value set in S118 (that is, the predetermined elapsed time) (S158).
Furthermore, the control part 21 controls the display part 24, and displays the stop time which is a calculation result of S158 (S159).
For this reason, if the operator visually recognizes the display unit 24, it is possible to know the time required for the machining unit 3 to automatically stop due to an abnormality related to the chip conveyor 5 (the time during which cutting is possible before stopping).
It should be noted that both the stop time related to the oil supply unit 4 and the stop time related to the chip conveyor 5 may be displayed, or only one of them may be displayed.

Next, it is determined whether the elapsed time incremented in S157 is equal to or greater than the threshold set in S118 (S160).
When the elapsed time from the occurrence of the abnormality is equal to or greater than the threshold (YES in S160), the control unit 21 sets a special abnormality flag in association with the abnormality relating to the chip conveyor 5 (S161).
After the process of S161 ends, or when the elapsed time from the occurrence of the abnormality is less than the threshold (NO in S160), the control unit 21 determines whether the time measurement end flag is set (S162).

If the timing end flag has not yet been set (NO in S162), the control unit 21 returns the process to S154.
If the time measurement end flag is set (YES in S162), the control unit 21 ends the increment of the clock counter started in S157 (S163), and ends the intermittent time measurement process.
When cutting is not in progress (NO in S156), the control unit 21 moves the process to S162.
As a result, the elapsed time is integrated by unit time during cutting, and the elapsed time is not counted during non-cutting. That is, the elapsed time is measured intermittently.

The control unit 21 that executes the processes of S60 and S100 functions as a first stopping unit in the embodiment of the present invention. The control unit 21 that executes the processes of S112, S114, S139, and S160 functions as a plurality of types of stop determination means in the embodiment of the present invention. The control unit 21 that executes the processing of S53 and S113, S140, or S161 functions as a second stopping unit in the embodiment of the present invention.
The control unit 21 that executes the process of S136 or S157 functions as an abnormality timing unit in the embodiment of the present invention. The control unit 21 that executes the process of S31 functions as an accepting unit in the embodiment of the present invention. The control unit 21 that executes the processes of S116 and S118 functions as setting means in the embodiment of the present invention.

The control unit 21 that executes the process of S137 or S158 functions as a stop calculation unit in the embodiment of the present invention. The control unit 21 that executes the process of S138 or S159 functions as a stop display unit in the embodiment of the present invention.
The control unit 21 that executes the process of S111 functions as a size detection unit in the embodiment of the present invention.
The control unit 21 that executes the process of S76 functions as an elapsed time measuring unit in the embodiment of the present invention. The control unit 21 that executes the process of S77 functions as a reading unit in the embodiment of the present invention. The control unit 21 that executes the process of S78 functions as time calculation means in the embodiment of the present invention. The control unit 21 that executes the process of S79 functions as an end display unit in the embodiment of the present invention.

Since a plurality of types of stop conditions are set in the machine tool 1 as described above, the machine unit 3 automatically stops depending on whether or not the stop condition is met when a moderate abnormality occurs. Two types of timings (whether execution of the machining program being executed has ended or execution of the block being executed have been completed) can be appropriately used. For this reason, the machine part 3 can be automatically stopped at an appropriate timing when a moderate abnormality has occurred regardless of the type of abnormality or the machining status of the workpiece. Accordingly, it is possible to suppress the deterioration of the abnormality, the unnecessary continuation of the machining on the workpiece, the unnecessary stop of the machining on the workpiece, and the lengthening of the time required to eliminate the abnormality.
In the elapsed time measurement process, the normal time measurement process, or the intermittent time measurement process, the elapsed time may be measured using a timer (not shown).

The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is not intended to include the above-described meanings, but is intended to include meanings equivalent to the claims and all modifications within the scope of the claims.
As long as the effects of the present invention are obtained, the machine tool 1 may include components that are not disclosed in the embodiment.
The constituent elements (technical features) disclosed in each embodiment can be combined with each other, and a new technical feature can be formed by the combination.

DESCRIPTION OF SYMBOLS 1 Machine tool 21 Control part 22 Memory | storage part 24 Display part

Claims (8)

A control unit that controls the operation of a machine tool that processes a workpiece based on a machining program for workpiece machining,
In the numerical control device having a first stop means for stopping the operation of the machine tool by stopping execution of the machining program at a predetermined timing when a predetermined abnormality occurs,
The controller is
When the abnormality occurs, a plurality of types of stop determination means for determining whether to stop the operation of the machine tool before reaching the predetermined timing;
A second stop means for stopping the operation of the machine tool by terminating the execution of the machining program when it is determined that at least one stop determination means stops ;
It possesses an abnormality counting means for counting an elapsed time from the occurrence of abnormality,
The abnormal time measuring means continues to measure the elapsed time while machining the workpiece, and interrupts the elapsed time while non-machining the workpiece,
One stop determining means, the measurement result of the abnormality counting means, when it is more than the threshold value of the elapsed time, the numerical control device according to claim Citea Rukoto to determine that stops. The numerical control apparatus according to claim 1 , wherein the control unit further includes a setting unit that sets the threshold according to a type of abnormality that has occurred. A display unit;
The controller is
A stop calculation means for calculating a stop time required until the operation of the machine tool is stopped by the second stop means by subtracting a time measurement result of the abnormal time measurement means from the threshold;
Numerical controller according to claim 1 or 2, characterized by further comprising a stop display means for displaying the calculation result of the stopping operation unit on the display unit. The predetermined timing is when the processing program being executed is finished,
The controller is
A size detecting means for detecting the size of the machining program being executed at least when the abnormality occurs;
2. The numerical control apparatus according to claim 1, wherein the stop determination unit determines that the stop is performed when the detection result of the size detection unit is equal to or larger than a predetermined size. A control unit that controls the operation of a machine tool that processes a workpiece based on a machining program for workpiece machining,
In the numerical control device having a first stop means for stopping the operation of the machine tool by stopping execution of the machining program at a predetermined timing when a predetermined abnormality occurs,
The predetermined timing is when the processing program being executed is finished,
The controller is
When the abnormality occurs, a plurality of types of stop determination means for determining whether to stop the operation of the machine tool before reaching the predetermined timing;
A second stop means for stopping the operation of the machine tool by terminating the execution of the machining program when it is determined that at least one stop determination means stops;
Size detecting means for detecting the size of the machining program being executed at least when the abnormality occurs;
Have
The numerical control apparatus according to claim 1, wherein the stop determination unit determines that the stop is performed when a detection result of the size detection unit is equal to or larger than a predetermined size. A storage unit that associates and stores the machining program and an end time required from the start to the end of execution of the machining program;
The controller is
An elapsed time measuring means for measuring an elapsed time since the execution of the machining program was started;
Reading means for reading out an end time associated with the machining program being executed from the storage unit when at least the abnormality has occurred;
Further comprising time calculating means for calculating a time required to end the execution of the machining program by subtracting a time measurement result of the elapsed time measuring means from an end time read by the reading means;
One stop determining means, wherein, when the operation result is equal to or greater than a predetermined threshold time calculation unit, the numerical control apparatus according to claim 1 or 5, characterized in that you have to be determined to be stopped. A control unit that controls the operation of a machine tool that processes a workpiece based on a machining program for workpiece machining,
In the numerical control device having a first stop means for stopping the operation of the machine tool by stopping execution of the machining program at a predetermined timing when a predetermined abnormality occurs,
A storage unit that associates and stores the machining program and an end time required from the start to the end of execution of the machining program;
The controller is
When the abnormality occurs, a plurality of types of stop determination means for determining whether to stop the operation of the machine tool before reaching the predetermined timing;
A second stop means for stopping the operation of the machine tool by terminating the execution of the machining program when it is determined that at least one stop determination means stops;
An elapsed time measuring means for measuring an elapsed time since the execution of the machining program was started;
Reading means for reading out an end time associated with the machining program being executed from the storage unit when at least the abnormality has occurred;
Time calculating means for calculating the time required to end the execution of the machining program by subtracting the time measurement result of the elapsed time measuring means from the end time read by the reading means;
Have
The numerical control apparatus according to claim 1, wherein the stop determination unit determines that the stop is performed when the calculation result of the time calculation unit is equal to or greater than a predetermined threshold value. A display unit;
Wherein the control unit, the numerical control apparatus according to claim 6 or 7, characterized by further comprising an end display means for displaying the calculation result of the time calculating unit on the display unit.

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