SYSTEM AND METHOD FOR TROUBLESHOOTING A MACHINE

• US 20070088454A1
• Filed: 12/12/2006
• Published: 04/19/2007
• Est. Priority Date: 10/25/2004
• Status: Abandoned Application

• Current Assignee: Ford Motor Company
• Original Assignee: Ford Motor Company
• Inventors: Jalluri, Chandra, Magadi, Prashanth, Kaufman, Ingrid, Ratze, Robert, Viswanathan, Mohan, Edie, Paul
• Application Number:
  US11/609,592
• Publication Number:
  US 20070088454A1
• Time in Patent Office: Days
• US Class Current: 700/159
• CPC Class Codes: G05B 19/4065 Monitoring tool breakage, life or condition

Abstract

A system and method for troubleshooting a operation of a machine include performing an initial, operator based analysis in response to an alarm indicator output by a processing unit monitoring the machine operation. The method uses a query-based analysis to guide the operator. A secondary analysis is used if the initial analysis does not yield the cause of the alarm. The secondary analysis can include a number of steps, including analyzing raw vibration data or trend lines generated from the raw data. If the trend lines are operation specific, a particular operation or particular tool may be identified as the cause of the alarm, and appropriate action can be taken. A tertiary analysis can also be used if the initial and secondary analyses do not yield the cause of the alarm.

Claims

1. A method for troubleshooting operation of a machine operable to perform at least one machining operation on a workpiece, a sensor operatively connected to the machine is configured to sense a machine operation parameter during operation of the machine, a processing unit operatively connected to the sensor includes a processor and a memory, and is configured to receive and store data related to the machine operation parameter received from the sensor, the data including values of the machine operation parameter and trend data for both machining operations and non-machining operations, a controller operatively connected to the machine is configured to output to the processing unit data related to operation of the machine, the processing unit is further configured to correlate data from the sensor and data from the controller to facilitate retrieval of machine operation parameter data for specific cutting tools and specific operations of the machine, the processing unit being further configured to output a fault signal when a fault condition is indicated, a fault condition occurring when the sensed machine operation parameter data meets predetermined fault criteria, the method comprising:

sending information related to the fault to an operator of the machine, including at least one of;

information indicating whether the fault was long term or short term, information identifying a statistical parameter used to characterize the machine operation parameter data, information indicating a time and date for when the fault was detected, information identifying a cutting tool in use when the fault condition occurs during a machining operation, or information identifying a machining operation being performed when the fault condition occurs during a machining operation;

sending query driven information to the operator of the machine, thereby guiding the operator through an initial analysis to determine the cause of the fault; and

performing a secondary analysis when the cause of the fault is not determined in the initial analysis, the secondary analysis including at least one of;

determining if a transient spike in the values of the stored machine operation parameter data is present, analyzing trend data for machining operations, analyzing trend data for non-machining operations, or analyzing certain operations of the machine to determine if the fault includes a machine fault.

2. The method of claim 1, further comprising performing a tertiary analysis when the cause of the fault is not determined in either the initial analysis or the secondary analysis.

3. The method of claim 2, wherein the step of performing the tertiary analysis includes correlating data from the processing unit related to the fault condition with previously collected data related to at least one of the machine or operations performed by the machine.

4. The method of claim 3, wherein the previously collected data includes historical data related to operation of the machine to determine if operation of the machine during the fault condition deviated from historical operating conditions of the machine.

5. The method of claim 3, wherein the previously collected data includes data related to operation of other machines to determine if operation of the machine during the fault condition deviated from operating conditions of the other machines

6. The method of claim 1, wherein the step of sending query driven information to the operator of the machine includes querying the operator to determine if the cause of the fault is discernable by observation of the machine, including observation of a cutting tool outside of a predetermined location and observation of an obstacle present inhibiting operation of the machine.

7. The method of claim 1, the machine including a spindle configured to hold a cutting tool and a slide operable to effect a linear movement of a portion of the machine, and wherein the step of analyzing certain operations of the machine to determine if the fault includes a machine fault includes performing at least one of an analysis of the spindle or an analysis of the slide.

8. The method of claim 7, wherein the analysis of the spindle includes:

loading a cutting tool in the spindle, and operating the spindle in a first manner, including accelerating the spindle until it reaches a first spindle speed, operating the spindle at the first spindle speed for a first predetermined time, and decelerating the spindle, and

processing data from signals output from the sensor and from the controller while the spindle is operated in the first manner to define a spindle data profile for the machine having an acceleration portion, a steady speed portion, and a deceleration portion corresponding to the respective movements of the spindle as it is operated in the first manner.

9. The method of claim 7, wherein the analysis of the slide includes operating the slide, and processing data from signals output from the sensor and from the controller while the slide is operated to define a slide data profile.

10. A method for troubleshooting operation of a machine operable to perform at least one machining operation on a workpiece, a sensor operatively connected to the machine is configured to sense a machine operation parameter during operation of the machine, a processing unit operatively connected to the sensor includes a processor and a memory, and is configured to receive and store data related to the machine operation parameter received from the sensor, the data including values of the machine operation parameter and trend data for both machining operations and non-machining operations, a controller operatively connected to the machine is configured to output to the processing unit data related to operation of the machine, the processing unit is further configured to correlate data from the sensor and data from the controller to facilitate retrieval of machine operation parameter data for specific cutting tools and specific operations of the machine, the processing unit being further configured to output a fault signal when a fault condition is indicated, a fault condition occurring when the sensed machine operation parameter data meets predetermined fault criteria, the method comprising:

sending information related to the fault to an operator of the machine, thereby guiding the operator through an initial analysis to determine the cause of the fault; and

performing a secondary analysis when the cause of the fault is not determined in the initial analysis, the secondary analysis including at least one of the following steps;

analyzing the stored machine operation parameter data to determine if a transient spike in the values of the stored machine operation parameter is present, thereby indicating a crash of the machine,

analyzing trend data for machining operations when the fault condition occurs during a machining operation, the trend data including at least one of a trend based on the cutting tool in use when the fault condition occurred or the machining operation being performed when the fault condition occurred,

analyzing trend data for non-machining operations when the fault condition occurs during a non-machining operation, or

performing an analysis of certain operations of the machine to determine if the fault condition resulted from a machine fault.

11. The method of claim 10, wherein the step of sending information related to the fault to an operator of the machine includes sending information that does not prompt the operator to take action, and information that does prompt the operator to take action.

12. The method of claim 11, wherein the information sent to the operator that does not prompt the operator to take action includes at least one of the following:

information indicating whether the fault was long term or short term,

information identifying a statistical parameter used to characterize the machine operation parameter data,

information indicating a time and date for when the fault was detected,

information identifying a cutting tool in use when the fault condition occurs during a machining operation, or

information identifying a machining operation being performed when the fault condition occurs during a machining operation.

13. The method of claim 11, wherein the information sent to the operator that does prompt the operator to take action includes information indicating that the operator should determine if the cause of the fault is discernable by observation of the machine, including a cutting tool outside of a predetermined location and an obstacle present inhibiting operation of the machine.

14. The method of claim 10, the machine including a spindle configured to hold a cutting tool and a slide operable to effect a linear movement of a portion of the machine, and wherein the step of performing an analysis of certain operations of the machine includes performing at least one of an analysis of the spindle or an analysis of the slide.

15. The method of claim 14, wherein the analysis of the spindle includes:

loading a cutting tool in the spindle, and operating the spindle in a first manner, including accelerating the spindle until it reaches a first spindle speed, operating the spindle at the first spindle speed for a first predetermined time, and decelerating the spindle, and

processing data from signals output from the sensor and from the controller while the spindle is operated in the first manner to define a spindle data profile for the machine having an acceleration portion, a steady speed portion, and a deceleration portion corresponding to the respective movements of the spindle as it is operated in the first manner.

16. The method of claim 14, wherein the analysis of the slide includes operating the slide, and processing data from signals output from the sensor and from the controller while the slide is operated to define a slide data profile.

17. The method of claim 10, further comprising performing a tertiary analysis when the cause of the fault is not determined in either the initial analysis or in the secondary analysis, the tertiary analysis including correlating data from the processing unit related to the fault condition with previously collected data related to at least one of the machine or operations performed by the machine.

18. The method of claim 17, wherein the previously collected data includes historical data related to operation of the machine to determine if operation of the machine during the fault condition deviated from historical operating conditions of the machine.

19. The method of claim 17, wherein the previously collected data includes data related to operation of other machines to determine if operation of the machine during the fault condition deviated from operating conditions of the other machines.

20. A system for troubleshooting operation of a machine operable to perform at least one machining operation on a workpiece, a sensor operatively connected to the machine is configured to sense a machine operation parameter during operation of the machine, a controller operatively connected to the machine is configured to output data related to operation of the machine, the system comprising:

an operator display for displaying information related to operation of the machine; and

a processing unit operatively connected to the controller and the sensor, and including a processor and a memory, the processing unit being configured to;

receive and store data related to the machine operation parameter received from the sensor, the data including values of the machine operation parameter and trend data for both machining operations and non-machining operations,

correlate data from the sensor and data from the controller to facilitate retrieval of machine operation parameter data for specific cutting tools and specific operations of the machine,

output a fault signal when a fault condition is indicated, a fault condition occurring when the sensed machine operation parameter data meets predetermined fault criteria,

send information related to the fault to the operator display, including at least one of;

information indicating whether the fault was long term or short term, information identifying a statistical parameter used to characterize the machine operation parameter data, information indicating a time and date for when the fault was detected, information identifying a cutting tool in use when the fault condition occurs during a machining operation, or information identifying a machining operation being performed when the fault condition occurs during a machining operation, and

sending query driven information to the operator display, thereby guiding the operator through an initial analysis to determine the cause of the fault, including querying the operator to determine if the cause of the fault is discernable by observation of the machine, including observation of a cutting tool outside of a predetermined location and observation of an obstacle present inhibiting operation of the machine.