Tool wear monitoring system

• US 7,010,386 B2
• Filed: 03/22/2002
• Issued: 03/07/2006
• Est. Priority Date: 03/22/2002
• Status: Expired due to Fees

• Current Assignee: Ryan P. Mcdonnell, Timothy R. Mcdonnell
• Original Assignee: Ryan P. Mcdonnell, Timothy R. Mcdonnell
• Inventors: McDonnell, Ryan P., McDonnell, Timothy R.
• Primary Examiner(s): Gandhi, Jayprakash N.
• Application Number:
  US10/104,201
• Publication Number:
  US 20030182014A1
• Time in Patent Office: 1,446 Days
• Field of Search: 700/117, 700/159, 700/174, 700/175, 340/540, 340/679, 340/680
• US Class Current: 700/175
• CPC Class Codes: G05B 19/4065 Monitoring tool breakage, life or condition
• CPC Class Codes: G05B 2219/37229 Test quality tool by measuring time needed for machining
• CPC Class Codes: G05B 2219/37252 Life of tool, service life, decay, wear estimation
• CPC Class Codes: Y02P 90/80 Management or planning

Abstract

A monitoring apparatus for monitoring one or more manufacturing machines having a plurality of component tools and engaged in repetitive machining of a part is provided. An input device detects occurrence of a machine cycle. A counter stores the number of detected machine cycles as a count value. A machine speed processor estimates a temporal rate at which the machine cycles occur. A data storage device stores a maintenance schedule indicating the number of machine cycles between recommended replacements for each tool. A tools processor estimates a remaining operating time for each tool before scheduled replacement. A machine viability processor estimates a remaining operating time for the machine before schedule replacement of each of the component tools. A display device displays the operating time for the machine before scheduled replacement of each of the component tools. A method for monitoring a cycling manufacturing machine includes detecting machine cycles of the manufacturing machine, estimating a machine operating rate based on the detecting step over time, and projecting tool change times for each of the plurality of tools based on the estimated machine operating rate and pre-selected tool cycle lifetime values for each of the plurality of tools.

Claims

1. A method for monitoring a manufacturing machine having at least one associated tool, the manufacturing machine engaged in repetitively producing a machined part, the monitoring method being performed on an electronic device having a display device for displaying information to an associated human operator, the method comprising:

receiving a tool life parameter value for the associated tool representing an expected number of machined parts to be produced by the associated tool;

detecting machine cycles of said manufacturing machine as a cycle count, each machine cycle corresponding to production of at least one machined part;

calculating an operating rate of the manufacturing machine based on the cycle count; and

,

estimating a remaining time for tool replacement based on the cycle count, the machine operating rate, and the received tool life parameter value.

2. The method as set forth in claim 1, further including:

defining a warning threshold time parameter value;

comparing the estimated time remaining with the warning threshold time parameter value; and

,

displaying a status of the manufacturing machine based on the comparing step.

3. The method as set forth in claim 2, wherein the displaying step includes:

displaying a first indicator comprising a green visual indicator when the comparing step results in an estimated time remaining that is greater than the warning threshold time parameter value; and

,

displaying a second visual indicator when the comparing step results in an estimated time remaining that is less than the warning threshold time parameter value.

4. The method as set forth in claim 3, wherein the displaying of said second indicator includes:

displaying a yellow visual indicator when the estimated time remaining is greater than zero; and

displaying a red visual indicator when the estimated time remaining is less than zero.

5. The method as set forth in claim 1, further including:

displaying a tools table showing the estimated remaining time for each of the at least one associated tool of the machine.

6. The method as set forth in claim 1, further including:

sorting a tools table containing the estimated remaining time for each of the at least one associated tool of the machine from shortest remaining time to longest remaining time; and

,

displaying the sorted tools table on said display device.

7. A method of monitoring a manufacturing machine having a plurality of associated tools, the manufacturing machine engaged in producing machined parts at a substantially constant rate, the method comprising:

storing a tool life parameter value for each of the plurality of associated tools representing an expected number of machined parts to be produced by each of the plurality of associated tools;

detecting machine cycles of said manufacturing machine as a cycle count, each machine cycle corresponding to production of at least one machined part;

calculating a machine operating rate of the manufacturing machine based on the cycle count; and

,

determining a remaining time for tool replacement based on the cycle count, the machine operating rate, and said tool life parameter value.

8. The method as set forth in claim 7, further including:

defining a warning threshold time parameter value;

comparing said remaining time for tool replacement with the warning threshold time parameter value; and

,

displaying a status of the manufacturing machine based on the comparing step.

9. The method as set forth in claim 8, wherein the displaying step includes:

generating a first signal when said remaining time for tool replacement is greater than said warning threshold time parameter value; and

,

generating a second signal when said remaining time for tool replacement is less than said warning threshold time parameter value.

10. The method as set forth in claim 9, wherein generating said second signal includes:

displaying a first visual indicator when said remaining time for tool replacement is greater than zero; and

displaying a second visual indicator when said remaining time for tool replacement is less than zero.

11. The method as set forth in claim 7, further including:

providing a tools table associating said remaining time for tool replacement with each of said plurality of associated tools of the machine.

12. The method as set forth in claim 7, further including:

sorting a tools table associating said remaining time for tool replacement with each of the plurality of associated tools of the machine from shortest remaining time to longest remaining time; and

,

displaying the sorted tools table on said display device.

13. The method as set forth in claim 7 wherein said determining includes:

determining a time for tool replacement for each of said plurality of associated tools of the manufacturing machine based on the cycle count, the machine operating rate, and said tool life parameter value for each of the plurality of associated tools.

14. A monitoring apparatus for monitoring an associated manufacturing machine having a plurality of tools and being engaged in repetitive machining of an associated part, the machining of the associated part relating to a machine cycle of said associated manufacturing machine, the monitoring apparatus comprising:

a machine cycle detector device adapted to detect an occurrence of a machine cycle;

a counter in operative communication with the machine cycle detector device and adapted to count said machine cycles;

a machine speed processor operatively associated with the counter and adapted to estimate a rate of said machine cycles;

a data storage device storing a maintenance schedule associating each of the plurality of tools with a number of machine cycles of useful life of the tool before recommended replacement;

a tools processor operatively associated with the counter, the machine speed processor, and the data storage device, the tools processor estimating, for each of said plurality of tools, a remaining operating time before scheduled replacement;

a machine viability processor operatively associated with the tools processor, the machine viability processor estimating a remaining operating time for the machine before scheduled replacement of a first tool among said plurality of tools having a smallest estimated remaining operating time; and

,

a signal generating device operatively associated with the machine viability processor for generating a signal representative of said remaining operating time for the machine.

15. The monitoring apparatus as set forth in claim 14, wherein the machine cycle detector device includes:

a plurality of sensors adapted to detect triggering states of cycle sensors of said manufacturing machine.

16. The monitoring apparatus as set forth in claim 15, wherein each sensor of said plurality of sensors includes:

a filtering circuit conditioning an output of the cycle sensor.

17. The monitoring apparatus as set forth in claim 14, wherein the machine cycle detector device includes a sensor adapted to detect a machine operation.

18. The monitoring apparatus as set forth in claim 14, wherein the signal generating device includes a display device adapted to selectively display, when the remaining operating time of said associated manufacturing machine is less than a predetermined threshold warning time, first indicia that maintenance should be performed.

19. The monitoring apparatus as set forth in claim 17, wherein the display device is adapted to display, when the remaining operating time of said machine is less than a predetermined urgency threshold, second indicia different than said first indicia that maintenance is urgent.

20. The monitoring apparatus as set forth in claim 17 further including a status indicator for indicating a machine status based on the estimated remaining operating time for the machine.

21. The monitoring apparatus as set forth in claim 17, further including:

a password-based user interface for providing selected user access to selected portions of the monitoring apparatus.

22. A monitoring apparatus for monitoring a set of associated manufacturing machines each having a plurality of tools, the set of machines being engaged in repetitive machining of a part, the machining of a part relating to a machine cycle, the monitoring apparatus comprising:

an input device adapted to detect occurrence of a machine cycle;

a counter in operative communication with the input device for counting machine cycles;

a machine speed processor operatively associated with the counter for estimating a temporal rate of machine cycle occurrences;

a data storage device for storing a maintenance schedule indicating a number of machine cycles between recommended replacement for each of said tools;

a tools processor operatively associated with the counter, the machine speed processor, and the data storage device, the tools processor estimating a remaining operating time for each tool before scheduled replacement;

a machine viability processor operatively associated with the tools processor, the machine viability processor estimating remaining operating times for the machine before scheduled replacement of each of said tools; and

,

a display device operatively associated with the machine viability processor for displaying selected remaining operating times.

23. The monitoring apparatus as set forth in claim 22, wherein the input device includes:

a plurality of sensors adapted to detect triggering states of cycle sensors of said set of manufacturing machines.

24. The monitoring apparatus as set forth in claim 23, wherein each sensor of said plurality of sensors includes:

a filtering circuit conditioning an output of the cycle sensor.

25. The monitoring apparatus as set forth in claim 22, wherein the input device includes:

a sensor that detects a machine operation.

26. The monitoring apparatus as set forth in claim 22, wherein the display device is adapted to selectively display, when the remaining operating time of one of said set of machines is less than a threshold warning time, an indicia that maintenance should be performed.

27. The monitoring apparatus as set forth in claim 26, wherein the indicia indicating that maintenance should be performed includes a yellow display background.

28. The monitoring apparatus as set forth in claim 22, wherein the display device is adapted to display, when the remaining operating time for one of said set of machines is less than an urgency threshold, an indicator that maintenance is urgent.

29. The monitoring apparatus as set forth in claim 28, wherein the indicator indicating that maintenance is urgent includes a red display background.

30. The monitoring apparatus as set forth in claim 22 wherein the associated set of manufacturing machines further include a status indicator and the monitoring apparatus further includes:

a monitor output communicating the machine viability processor and with the status indicator of the manufacturing machine for indicating a machine status via the status indicator based on the estimated remaining operating time for the machine.

31. The monitoring apparatus as set forth in claim 22 wherein the associated set of manufacturing machines further include a set of stacked visual indicators and the monitoring apparatus further includes:

a monitor output communicating the machine viability processor and with the set of stacked visual indicators for indicating a machine status via the set of stacked visual indicators based on the estimated remaining operating time for the machine.

32. The monitoring apparatus as set forth in claim 22, further including:

a password-based user interface for providing selected user access to selected portions of the monitoring apparatus.

33. A monitor for monitoring a manufacturing machine including a plurality of tools, the monitor comprising:

a means for detecting machine cycles of said manufacturing machine;

a means, communicating with the detecting means, for determining a machine cycling rate; and

,

a means for projecting tool change times for each of said plurality of tools based on the machine cycling rate and pre-selected tool cycle lifetime values.

34. The method as set forth in claim 33, further including:

a means for notifying an associated machine operator in advance of a projected tool change time.