Flexible real-time, multi-tasking architecture for tool condition monitoring

• US 5,212,645 A
• Filed: 07/19/1990
• Issued: 05/18/1993
• Est. Priority Date: 07/19/1990
• Status: Expired due to Fees

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Montanaro, George D., Wildes, Douglas G., Hayashi, Steven R.
• Primary Examiner(s): Smith, Jerry
• Assistant Examiner(s): GORDON, PAUL P
• Application Number:
  US07/554,495
• Time in Patent Office: 1,034 Days
• Field of Search: 364/468, 364/474.16, 364/474.17, 364/474.19, 364/550, 364/551.02, 364/264, 364/269.4, 340/680, 340/679
• US Class Current: 700/108
• CPC Class Codes: G05B 19/4065 Monitoring tool breakage, life or condition
• CPC Class Codes: G05B 19/4148 characterised by using several processors for different functions, distributed (real-time) systems G05B19/4141 takes precedence
• CPC Class Codes: G05B 19/4163 Adaptive control of feed or cutting velocity without NC B23Q15/12
• CPC Class Codes: G05B 2219/31118 Universal interface between asi and fieldbus, for any fielddevice
• CPC Class Codes: G05B 2219/31145 Ethernet
• CPC Class Codes: G05B 2219/31151 Lan local area network
• CPC Class Codes: G05B 2219/31186 TCP-IP internet protocol
• CPC Class Codes: G05B 2219/31244 Safety, reconnect network automatically if broken
• CPC Class Codes: G05B 2219/31247 Reconnect network if connection was broken
• CPC Class Codes: G05B 2219/32422 Tool management and database management
• CPC Class Codes: G05B 2219/33053 Modular hardware, software, easy modification, expansion, generic, oop
• CPC Class Codes: G05B 2219/33212 Processor for communication with, evaluation of signals form detector to pc
• CPC Class Codes: G05B 2219/33244 Packet information exchange
• CPC Class Codes: G05B 2219/34225 Interface board for measuring system, for resolver, encoder or interferometer
• CPC Class Codes: G05B 2219/34327 Modify, adapt system response to signals from process
• CPC Class Codes: G05B 2219/34381 Multitasking
• CPC Class Codes: G05B 2219/34423 Optical isolation, galvanic isolation
• CPC Class Codes: G05B 2219/35273 Sensor to detect functioning of signal conditioning elements
• CPC Class Codes: G05B 2219/35291 Record history, log, journal, audit of machine operation
• CPC Class Codes: G05B 2219/37245 Breakage tool, failure
• CPC Class Codes: G05B 2219/37285 : Load, current taken by motor
• CPC Class Codes: G05B 2219/37351 : Detect vibration, ultrasound
• CPC Class Codes: G05B 2219/37388 : Acceleration or deceleration, inertial measurement
• CPC Class Codes: Y02P 90/02 : Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

Abstract

This invention utilizes a system of interlinked modular hardware and modular software for continuously controlling the manufacture of a workpiece. By using a modular architecture, the system capabilities can be expanded or modified without requiring major redesign.

Claims

1. A system for manufacturing a workpiece comprising modular hardware interlinked with modular software, wherein said modular hardware comprises:

(a) sensors for detecting signals in the manufacturing process;

(b) signal conditioning elements for transmitting said detected signals to the system;

wherein said modular software comprises one or more signal processing algorithms adapted for detecting features in aid detected signals for controlling the manufacture of the workpiece, wherein one or more interface task and data structures isolate the signal processing algorithms from external data formats, wherein said interface tasks and external data formats comprise a computer network interface, wherein said computer network interface is operable for recording sensor data and other diagnostic information, and wherein said computer network interface automatically reconnects if a network connection is broken and discards data without disrupting real-time performance if the network connection cannot be reestablished.

2. The system of claim 1 wherein said sensor comprises a piezoelectric accelerometer for detecting ultrasonic energy.

3. The system of claim 1 wherein said sensor comprises a horsepower sensor for detecting the power consumed by the manufacturing process.

4. The system of claim 1 wherein said sensor comprises a low frequency accelerometer.

5. The system of claim 1 wherein said sensor comprises a current sensor for detecting the axis current.

6. The system of claim 1 wherein said sensor comprises a tachometer for detecting the velocity of a rotating axis in the manufacturing process.

7. The system of claim 1 wherein said sensor comprises a sensor for detecting the functioning of said signal conditioning elements.

8. The system of claim 1 wherein said signal conditioning elements comprise isolation amplifiers.

9. The system of claim 1 wherein said signal conditioning elements comprise a resolver and an encoder interface.

10. The system of claim 1 wherein said signal conditioning elements comprise an ultrasonic energy preprocessor.

11. The system of claim 1 wherein said signal conditioning elements comprise a drive module.

12. The system of claim 1 wherein said signal conditioning elements comprise an internal bus module.

13. The system of claim 1 wherein said signal conditioning elements comprise a computer numerical control module.

14. The system of claim 1 wherein said signal conditioning elements comprise an ultrasonic energy module.

15. The system of claims 1 or 14 wherein said signal conditioning module comprise a clock module.

16. The system of claim 1 wherein said signal processing algorithm is adapted to output a continual stream of analyzed data.

17. The system of claim 1 wherein said signal processing algorithm is adapted to output packets of event data.

18. The system of claim 1 wherein said signal processing algorithm executes tasks simultaneously and independently.

19. The system of claim 1 wherein one or more processing parameters of said signal processing algorithm are changed for modifying the manufacturing process.

20. The system of claim 1 wherein one or more alternate signal processing algorithms are substituted for said signal processing algorithms.

21. The system of claim 1 wherein message queues and data ring buffers provide for asynchronous operation of the signal processing algorithms.

22. The system of claim 1, wherein said computer network interface is used for modifying the system'"'"'s response to signals from the manufacturing process.

23. The system of claim 1 wherein said signal processing algorithm is a tool break detection algorithm based on monitoring of ultrasonic energy.

24. The system of claim 1 wherein said signal processing algorithm is a tool wear detection algorithm based on monitoring of spindle power and ultrasonic energy.

25. The system of claim 1 wherein said modular software comprises a plurality of the signal processing algorithms and wherein the signal processing algorithms only interface with internal data formats, said internal data formats being standardized and independent of the external environment.

26. A method of manufacturing a workpiece, comprising:

(a) detecting signals in the manufacturing process by one or more interchangeable and modular sensing means;

(b) transmitting said detected signals by interchangeable and modular signal conditioning means; and

(c) processing said signals from said signal conditioning means by at least one signal processing algorithm means by detecting features in said signals for controlling the manufacturing process, said at least one signal processing algorithm means is modular software interlinked with said interchangeable and modular signal conditioning means, said at least one signal processing algorithm means is isolated from external data formats by one or more interface tasks and data structures, said interface tasks and external data formats comprise a computer network interface, and further comprising the steps of;

using said computer network interface for recording sensor data and other diagnostic information;

automatically reconnecting said network interface upon breaking of a network connection; and

discarding data without disrupting real-time performance if the network connection cannot be reestablished.