Numerical control unit that pre-announces scheduled operations

• US 5,428,547 A
• Filed: 07/09/1992
• Issued: 06/27/1995
• Est. Priority Date: 07/10/1991
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Ikeda, Mutsumi
• Primary Examiner(s): Gordon, Paul P.
• Application Number:
  US07/911,544
• Time in Patent Office: 1,083 Days
• Field of Search: 364/184, 364/185, 364/468, 364/401, 364/474.16, 364/551.02
• US Class Current: 700/174
• CPC Class Codes: G05B 19/4184 characterised by fault tolerance, reliability of production system
• CPC Class Codes: G05B 19/41865 characterised by job scheduling, process planning, material flow
• CPC Class Codes: G05B 2219/31407 Machining, work, process finish time estimation, calculation
• CPC Class Codes: G05B 2219/32226 Computer assisted repair, maintenance of system components
• CPC Class Codes: G06Q 10/06 Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
• CPC Class Codes: Y02E 60/32 Hydrogen storage
• CPC Class Codes: Y02P 90/02 Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
• CPC Class Codes: Y02P 90/80 Management or planning

Abstract

A numerical control unit and method of operation therefor which pre-announces scheduled parts ordering, maintenance, loading, unloading and inspection times by display or audio notice to an operator. On the basis of a programmed control of the machine in block form and a reference time of day (including day, week, month, year etc.) generated by a clock, time related information is stored and the time for performance of time-related events are calculated. The stored time-related information can include (i) the expected run time for the entire machining program or for a portion of the program until the occurrence of a specific program event, such as the execution of a specified command; (if) the expected schedule times for machine operation and inspection events, such as power-on/off, run start, cutting start, etc.; and (iii), the messages related to operational events and machine conditions. The calculated information can include the expected end times for an entire run, for the occurrence of a specified command, for machine operation and inspection events, determined on the basis of the current time of day and the actual execution of the machine operation. The calculated information is updated with machine operation and is used as the basis for reading and displaying/announcing messages concerning the machine condition.

Claims

1. In a numerical control unit for performing numerical control processing on the basis of a machining command program and driving a machine tool according to the results of said processing whereby a workpiece is machined, the improvement comprising:

a clock for counting a cycle signal and updating an initial time to generate a current time;

initial time setting means for setting said clock at a selectable initial time;

current time reading means for reading a current time from said clock;

a time memory table for storing at least one of (i) a first expected run time of the machining command program and (ii) a second expected run time from the start of the machining command program to the execution of at least one specified command in the machining command program;

expected run time setting means for storing in said time memory table at least one of said first expected run time and said second expected run time;

time expecting means for operating on at least one of said first expected run time and second expected run time from said table and a current time from said clock and thereby generating a corresponding first expected end time, comprising the end of said run, and a second expected end time, comprising the time of specified command execution;

automatic start detecting means for detecting the start of the machining command program run; and

wherein said current time reading means is operative to read the current time in response to the detection by said automatic start detecting means of the start of the machining command program run, and

in response thereto, said time expecting means operates on at least one of said first expected run end time and said second expected run end time from said time expecting means and said first expected run time and second expected run time stored in said time memory table.

2. A numerical control unit, as set forth in claim 1, wherein said expected run time setting means comprises:

machining command program analyzing means for analyzing the machining command program and generating analysis data;

expected execution time operating means for operating on expected execution time from said analysis data;

expected execution time accumulating means wherein the expected execution time is accumulated;

first command determining means for determining a run end command and specific commands from said analysis data; and

wherein at least one of said first expected run time and said second expected run time is operated on and set into said time memory table.

3. A numerical control unit, as set forth in claim 2, comprising:

a message memory table corresponding to said time memory table for storing at least one of a message concerning said first expected run end time and a message concerning said specific commands of said second expected run end time;

message setting means for storing said messages in said message memory table;

reporting means for reporting said messages; and

wherein data in the machining command program is stored and reported by said messages by said machining program analyzing means.

4. A numerical control unit, as set forth in claim 1, further comprising an optional stop switch having a valid and invalid state, wherein said specific command is only a program stop command if said optional stop switch is invalid and said specific command comprises both a program stop command and an optional program stop command if said optional stop switch is valid.

5. A numerical control unit, as set forth in claim 1, further comprising reporting means for reporting at least one of said first expected end time and said second expected end time.

6. A numerical control unit, as set forth in claim 1, comprising:

reporting means for reporting a scheduled time of arrival;

time comparing means for comparing said current time read from said clock with at least one of said first expected end time and said second expected end time; and

means for generating a scheduled time of arrival report in response to said clock current time being past said at least one first and second expected end time.

7. A numerical control unit, as set forth in claim 1, comprising:

an expected time memory table for storing at least one of said first expected end time and said second expected end time;

an expected time setting means for storing in said expected time memory table at least one of said first expected end time and said second expected end time;

a resultant time memory table for storing resultant times associated with at least one of said first and second expected end times;

resultant time setting means for storing the time read current in said resultant time memory table; and

displaying means for displaying said expected time and said resultant time.

8. A numerical control unit, as set forth in claim 7, comprising:

second command determining means for determining the execution of a run end command; and

means for activating the resultant time setting means to automatically set the resultant time when said run end command is executed.

9. A numerical control unit, as set forth in claim 7, comprising:

third command determining means for determining the start of execution of a command subsequent to a specific command in the machining program; and

means for activating said resultant time setting means to automatically store said resultant time when the command subsequent to said specific command in the machining command program is executed.

10. A numerical control unit, as set forth in claim 7, comprising:

expected error time operating means for calculating expected error time by subtracting said resultant time from said expected time; and

displaying means for displaying expected error time.

11. A numerical control unit, as set forth in claim 7, comprising:

expected error time operating means for calculating expected error time by subtracting said resultant time from said expected time;

expected time updating means for updating said expected time memory table by adding an expected error time to an expected time stored in said expected time memory table; and

wherein said expected time is updated concurrently with the setting of said resultant time.

12. A numerical control unit, as set forth in claim 7, comprising:

reporting means for reporting said expected time and said resultant time.

13. A numerical control unit, as set forth in claim 7, comprising:

reporting means for reporting a pre-announced time of arrival;

a pre-announced time memory for storing said pre-announced time which comprises a time difference between said expected time and said pre-announced time stored before said expected time;

pre-announced time setting means for storing said pre-announced time in said pre-announced time memory;

pre-announced time operating means for calculating said pre-announced time by subtracting said pre-announced time from said expected time;

time comparing means for comparing arbitrary times; and

means for the current time read from said clock with said pre-announced time, and means for generating a pre-announced time arrival report when said current time is past said pre-announced time.

14. A numerical control unit, as set forth in claim 1, wherein said expected run time setting means comprises:

an ejected chip volume memory for storing a chip volume to be ejected;

ejected chip volume setting means for storing said ejected chip volume in said ejected chip volume memory;

machining command program analyzing means for analyzing the machining command program;

expected chip volume operating means for calculating an expected chip volume from analysis data;

expected chip volume accumulating means for accumulating said expected chip volumes;

ejection block specifying means for comparing the expected chip volume accumulation and the ejected chip volume, specifying each command block wherein the expected chip volume accumulation is greater than an integral multiple of the ejected chip volume, and specifying blocks for which chips must be ejected;

expected execution time operating means for operating on expected execution time from said analysis data;

expected execution time accumulating means for accumulating said expected execution time;

fourth command determining means for determining the ejection block specified according to said analysis data; and

wherein the expected run end time, until the ejection block in the machining command program is executed, is operated on and stored in said time memory table.

15. A numerical control unit, as set forth in claim 14, wherein said ejection block specifying means specifies as the ejection block a first tool change command given after any command blocks wherein the expected chip volume accumulation is greater than an integral multiple of the ejected chip volume.

16. A numerical control unit, as set forth in claim 1, comprising:

a message memory table for storing messages of a run end command and specific commands corresponding to the time memory table;

message setting means for storing said messages in said message memory table; and

reporting means for reporting the messages.

17. A numerical control unit, as set forth in claim 1, wherein said specific command is a program stop command.

23. A numerical control unit, as set forth in any one of claims 5, 6, 12, 13, 16, 3, 18 and 20, wherein said reporting means comprises display means.

24. A numerical control unit, as set forth in claims 5, 6, 12, 13, 16, 3, 18 and 20, wherein said reporting means comprises communication means.

25. A numerical control unit, as set forth in claim 24 wherein said communication means comprises a telephone line.

26. A numerical control unit, as set forth in claim 24 wherein said communication means transmits a voice signal.

18. A numerical control unit comprising:

a clock for counting a cycle signal and updating time of day;

TOD setting means for setting arbitrary time of day to the clock;

TOD reading means for reading time of day from said clock;

an inspection awaiting information memory table for storing inspection awaiting information, said inspection awaiting information comprising one or more of data identifying inspection items, inspection intervals, related inspection information link information, and inspection awaiting start time;

TOD comparing means for comparing the time of day read from said clock and the scheduled inspection time of day;

inspection completion information input means;

a run schedule memory for storing at least one of scheduled times of day for power-on, run start and cutting start, and scheduled times of day for power-off, run end and cutting end;

setting means for storing in said run schedule memory at least one of said scheduled times of day for power-on, run start and cutting start, and said scheduled times of day for power-off, run end and cutting end;

next scheduled inspection TOD estimating means for estimating next scheduled inspection time of day from said inspection interval, inspection awaiting start time of day, and run schedule;

registering and deleting means for registering new inspection awaiting information in said inspection awaiting information memory table and deleting specific inspection awaiting information from said inspection awaiting information memory table;

reporting means for reporting at least the scheduled inspection time of day and scheduled inspection time of day arrival information;

wherein the associated inspection awaiting information may be deleted from or newly generated inspection time registered to said inspection awaiting information memory table when inspection completion information is entered;

wherein the next scheduled inspection time of day may be estimated from the time of day read from said clock and said inspection interval, inspection awaiting start time of day, inspection time counting condition and run schedule corresponding to the inspection awaiting information;

means for updating and for reporting the scheduled inspection time of day in the inspection awaiting information; and

means for comparing the time of day read from said clock with the scheduled inspection time of day in said inspection awaiting information, and means for reporting scheduled inspection time of day arrival information when said clock is past the scheduled inspection time of day.

19. A numerical control unit, as set forth in claim 18, wherein said scheduled inspection time of day arrival information differs corresponding to the inspection item.

20. A numerical control unit, as set forth in claim 18, comprising:

reporting means for reporting inspection pre-announcement;

a pre-announced time memory for storing a pre-announced time which comprises a time difference between the scheduled time of day and the pre-announced time of day set before the scheduled time of day;

pre-announced time setting means for setting the pre-announced time to the pre-announced time memory;

pre-announced TOD operating means for calculating the pre-announced time of day by subtracting the pre-announced time from the scheduled time of day;

TOD comparing means for comparing arbitrary times of day; and

means for comparing the time of day read from the clock with the pre-announced time of day, and means for pre-announcing inspection when said clock is past the pre-announced time of day.

21. A numerical control unit, as set forth in claim 18, wherein the inspection awaiting information comprises an inspection interval condition to provide the inspection interval with the inspection interval condition comprising at least one of elapsed time, power-on duration, run time or cutting time;

and

wherein said next scheduled inspection TOD estimating means estimates the next scheduled inspection time of day from the inspection interval, the inspection awaiting start time of day, the run schedule and the inspection interval condition.

22. A numerical control unit, as set forth in claim 18, further comprising:

a run result memory for storing at least one resultant time of day for at least one of power-on, run start and cutting start and at least one resultant time of day for at least one of power-off, run end and cutting end;

run result writing means for writing to the run result memory the resultant times of day for at least one of power-on, run start and cutting start operations and the resultant times of day for at least one of power-off, run end and cutting end operations; and

wherein the next scheduled inspection TOD estimating means estimates the next scheduled inspection time of day from the inspection interval, the inspection awaiting start time of day, the run schedule and the run results.

27. A numerical control method comprising:

generating a time of day value;

storing inspection awaiting information, said inspection awaiting information comprising one or more of data identifying inspection items, inspection intervals, related inspection information link information, and inspection awaiting start time;

comparing said generated time of day and the scheduled inspection time of day;

storing at least one of scheduled times of day for power-on, run start and cutting start, and scheduled times of day for power-off, run end and cutting end;

storing at least one of said scheduled times of day for power-on, run start and cutting start, and said scheduled times of day for power-off, run end and cutting end;

estimating next scheduled inspection time of day from said inspection interval, inspection awaiting start time of day, and a run schedule;

registering new inspection awaiting information in an inspection awaiting information memory table and deleting specific inspection awaiting information from said inspection awaiting information memory table;

reporting at least the scheduled inspection time of day and scheduled inspection time of day arrival information;

wherein the associated inspection awaiting information may be deleted from or newly generated inspection time registered to said inspection awaiting information memory table when inspection completion information is entered;

wherein the next scheduled inspection time of day may be estimated from said generated time of day and said inspection interval, inspection awaiting start time of day, inspection time counting condition and run schedule corresponding to the inspection awaiting information, and the scheduled inspection time of day in the inspection awaiting information may be updated and reported; and

wherein said generated time of day is compared with the scheduled inspection time of day, and scheduled inspection time of day arrival information is reported when said generated time of day is past the scheduled inspection time of day.

28. In a method of performing numerical control processing on the basis of a machining command program and driving a machine tool according to the results of said processing whereby a workpiece is machined, the improvement comprising:

generating a current time;

storing in a time memory table at least one of (i) a first expected run time of the machining command program and (ii) a second expected run time from the start of the machining command program to the execution of at least one specified command in the machining command program;

analyzing the machining command program and generating analysis data;

operating on expected execution time from said analysis data;

accumulating the expected execution time;

determining a run end command and specific commands from said analysis data;

wherein at least one of said first expected run time and said second expected run time is operated on and set into said time memory table; and

generating, on the basis of a current time value and at least one of said first expected run time and said second expected run time, a corresponding first expected end time, comprising the end of said command program run, and a second expected end time, comprising the time of a specified command execution.

29. In a method of performing numerical control processing on the basis of a machining command program and driving a machine tool according to the results of said processing whereby a workpiece is machined, the improvement comprising:

generating a current time;

storing in a time memory table at least one of (i) a first expected run time of the machining command program and (ii) a second expected run time from the start of the machining command program to the execution of at least one specified command in the machining command program;

generating, on the basis of a current time value and at least one of said first expected run time and said second expected run time, a corresponding first expected end time, comprising the end of said command program run, and a second expected end time, comprising the time of a specified command execution;

reporting a scheduled time of arrival;

comparing said current time with at least one of said first expected end time and said second expected end time; and

generating a scheduled time of arrival report in response to said current time being past said at least one first and second expected end time.

30. In a method of performing numerical control processing on the basis of a machining command program and driving a machine tool according to the results of said processing whereby a workpiece is machined, the improvement comprising:

generating a current time;

storing in a time memory table at least one of (i) a first expected run time of the machining command program and (ii) a second expected run time from the start of the machining command program to the execution of at least one specified command in the machining command program;

generating, on the basis of a current time value and at least one of said first expected run time and said second expected run time, a corresponding first expected end time, comprising the end of said command program run, and a second expected end time, comprising the time of a specified command execution;

storing in said expected time memory table at least one of said first expected end time and said second expected end time;

storing resultant times associated with at least one of said first and second expected end times; and

displaying said expected time and said resultant time.

31. In a method of performing numerical control processing on the basis of a machining command program and driving a machine tool according to the results of said processing whereby a workpiece is machined, the improvement comprising:

generating a current time;

storing in a time memory table at least one of (i) a first expected run time of the machining command program and (ii) a second expected run time from the start of the machining command program to the execution of at least one specified command in the machining command program;

generating, on the basis of a current time value and at least one of said first expected run time and said second expected run time, a corresponding first expected end time, comprising the end of said command program run, and a second expected end time, comprising the time of a specified command execution;

storing a chip volume to be ejected;

analyzing the machining command program;

calculating an expected chip volume from analysis data;

accumulating said expected chip volumes;

comparing the expected chip volume accumulation and the ejected chip volume, specifying each command block wherein the expected chip volume accumulation is greater than an integral multiple of the ejected chip volume, and specifying blocks for which chips must be ejected;

operating on expected execution time from said analysis data;

accumulating said expected execution time;

determining the ejection block specified according to said analysis data; and

wherein the expected run end time until the ejection block in the machining command program is executed is operated on and stored.

32. In a method of performing numerical control processing on the basis of a machining command program and driving a machine tool according to the results of said processing whereby a workpiece is machined, the improvement comprising:

generating a current time;

storing in a time memory table at least one of (i) a first expected run time of the machining command program and (ii) a second expected run time from the start of the machining command program to the execution of at least one specified command in the machining command program;

generating, on the basis of a current time value and at least one of said first expected run time and said second expected run time, a corresponding first expected end time, comprising the end of said command program run, and a second expected end time, comprising the time of a specified command execution;

storing a chip volume to be ejected;

analyzing the machining command program;

calculating an expected chip volume from analysis data;

accumulating said expected chip volumes;

comparing the expected chip volume accumulation and the ejected chip volume, specifying each command block wherein the expected chip volume accumulation is greater than an integral multiple of the ejected chip volume, and specifying blocks for which chips must be ejected;

operating on expected execution time from said analysis data;

accumulating said expected execution time;

determining the ejection block specified according to said analysis data; and

wherein the expected run end time until the ejection block in the machining command program is executed is operated on and stored; and

specifying as the ejection block a first tool change command given after any command blocks wherein the expected chip volume accumulation is greater than an integral multiple of the ejected chip volume.

33. In a method of performing numerical control processing on the basis of a machining command program and driving a machine tool according to the results of said processing whereby a workpiece is machined, the improvement comprising:

generating a current time;

storing in a time memory table at least one of (i) a first expected run time of the machining command program and (ii) a second expected run time from the start of the machining command program to the execution of at least one specified command in the machining command program; and

generating, on the basis of a current time value and at least one of said first expected run time and said second expected run time, a corresponding first expected end time, comprising the end of said command program run, and a second expected end time, comprising the time of a specified command execution;

storing messages of a run end command and specific commands corresponding to the time memory table;

storing said messages in a message memory table; and

reporting the messages.