Control graphics system for gear shaping machines

• US 5,345,390 A
• Filed: 03/15/1993
• Issued: 09/06/1994
• Est. Priority Date: 09/04/1990
• Status: Expired due to Term

• Current Assignee: Bourn & Koch, Inc. (InCompass LLC)
• Original Assignee: Fellowes Incorporated
• Inventors: Chase, Gregory H., Nichols, Clarence M., Greenip, Lawrence E. Jr.
• Primary Examiner(s): RUGGIERO, JOSEPH F
• Application Number:
  US08/032,415
• Time in Patent Office: 540 Days
• Field of Search: 364/474.16, 364/474.17, 364/474.19, 364/474.21, 364/474.02, 364/474.12, 364/474.15, 364/474.24, 364/474.26, 364/551.02, 364/507 , 364/508, 73/104, 409/2, 409/15, 408/3, 408/10-12, 318/561, 318/563, 318/565, 377/15, 377/16
• US Class Current: 700/175
• CPC Class Codes: B23F 23/1287 Pinion shaper cutter holders
• CPC Class Codes: G05B 19/4065 Monitoring tool breakage, life or condition
• CPC Class Codes: G05B 2219/35291 Record history, log, journal, audit of machine operation
• CPC Class Codes: G05B 2219/37074 Projection device, monitor, track tool, workpiece form, process on display
• CPC Class Codes: G05B 2219/37252 Life of tool, service life, decay, wear estimation
• CPC Class Codes: G05B 2219/37343 Load, vectorial components of load
• CPC Class Codes: G05B 2219/37542 Curve fitting measured points, predict, extrapolate dimension in time
• CPC Class Codes: G05B 2219/37587 Count number of machining cycles, frequency use of tool
• CPC Class Codes: G05B 2219/45214 Gear cutting

Abstract

A control system for a hydro-mechanically stroked gear shaper provides control and diagnostic functions. The control system includes a video display and a microprocessor. The microprocessor is programmed to monitor load force imparted by a cutting tool over its lifetime. The microprocessor also monitors the number of times a cutting tool is used. By monitoring these parameters, the system provides a indication of when the cutting tool has exceeded its useful life. The control sysem also provides a graphical representation of the gear shaper. When an operational problem is sensed by sensors in the gear shaper, the graphical representation indicates where the problem has arisen.

Claims

1. A monitoring system for monitoring use of a gear shaper apparatus having a cutting tool rotatable about a spindle axis and reciprocable along said spindle axis, said monitoring system comprising:

a) a sensor for measuring an amount of load applied by the cutting tool of the gear shaper apparatus during each of a plurality of workpiece cutting operations in which a plurality of workpieces are cut with the cutting tool;

b) a memory for storing measurements of load applied by the cutting tool as obtained by the sensor over time during each cutting operation of the gear shaper apparatus for the plurality of workpieces; and

c) a processor for processing the measurements of load obtained by the sensor and held in the memory to accumulate historical information regarding use of the cutting tool, said accumulated historical information being based on load measurements obtained during the plurality of cutting operations.

2. A monitoring system as recited in claim 1 wherein the memory holds measurements of load applied by the cutting tool for a time frame elapsing between a first use of the cutting tool and a most recent use of the cutting tool.

3. A monitoring system as recited in claim 1 wherein the historical information comprises an indication of load trends over the life of the cutting tool.

4. A monitoring system as recited in claim 1 wherein the historical information indicates whether the cutting tool should be replaced with a new cutting tool.

5. A monitoring system as recited in claim 1 wherein the cutting tool is coupled to a hydro-mechanically stroked cutting spindle.

6. A method of optimizing use of a cutting tool in a gear shaper apparatus, said cutting tool being rotatable about a spindle axis and reciprocable along said axis, said method comprising the steps of:

a) measuring a load applied by the cutting tool for each of a plurality of cutting operations of the cutting tool in which a plurality of workpieces are cut with the cutting tool;

b) accumulating the measurements of load applied by the cutting tool over the plurality of cutting operations to establish historical information based on measurements of load obtained during the plurality of cutting operations; and

c) replacing the cutting tool when the historical information indicates that the total accumulated cutting tool load exceeds a predetermined value.

7. A method of monitoring use of a cutting tool of a gear shaper apparatus, comprising the steps of:

sensing the application of a load by the cutting tool on a workpart, said load application defining a use of the cutting tool;

maintaining a count of how many times the cutting tool has been used;

storing the count in a memory;

indicating to a user of the gear shaper apparatus when the count exceeds a specific value so that the user knows that the cutting tool needs to be replaced.

8. A method as recited in claim 7 wherein the cutting tool is hydro-mechanically stroked.

9. A monitoring system for monitoring operation of a gear shaper apparatus in real time comprising:

a) a video display;

b) sensors positioned on the gear shaper apparatus to physically sense present operating conditions of the gear shaper apparatus as the gear shaper apparatus operates; and

c) a microprocessor programmed to receive indications of the physically sensed present gear shaper apparatus operating conditions, to generate a graphical depiction of the gear shaper apparatus on the video display and to presently indicate on said graphical depiction the physically sensed conditions of the gear shaper apparatus.

10. A monitoring system as recited in claim 9 wherein the graphical depiction of the apparatus is an outline of the apparatus.

11. A monitoring system as recited in claim 9 wherein the gear shaper apparatus is a hydro-mechanically stroked apparatus.

12. The monitoring system of claim 9 wherein the operating conditions sensed are selected from the group comprising hydraulic fluid reservoir fluid level, hydraulic fluid temperature, accumulator precharge pressure level, front splash guard position, rear splash guard position, change gear door position, coolant level, stroke door position, fixture pressure, stroke position, motor overload, hydraulic fluid filter contamination and hydraulic fluid supply pressure.

13. The monitoring system of claim 9 wherein the operating conditions sensed comprise hydraulic fluid reservoir fluid level.

14. The monitoring system of claim 9 wherein the operating conditions sensed comprise hydraulic fluid temperature.

15. The monitoring system of claim 9 wherein the operating conditions sensed comprise accumulator precharge pressure level.

16. The monitoring system of claim 9 wherein the operating conditions sensed comprise front splash guard position.

17. The monitoring system of claim 9 wherein the operating conditions sensed comprise rear splash guard position.

18. The monitoring system of claim 9 wherein the operating conditions sensed comprise change gear door position.

19. The monitoring system of claim 9 wherein the operating conditions sensed comprise coolant level.

20. The monitoring system of claim 9 wherein the operating conditions sensed comprise stroke door position.

21. The monitoring system of claim 9 wherein the operating conditions sensed comprise fixture pressure.

22. The monitoring system of claim 9 wherein the operating conditions sensed comprise stroke position.

23. The monitoring system of claim 9 wherein the operating conditions sensed comprise motor overload.

24. The monitoring system of claim 9 wherein the operating conditions sensed comprise hydraulic fluid filter contamination.

25. The monitoring system of claim 9 wherein the operating conditions sensed comprise hydraulic fluid supply pressure.

26. The monitoring system of claim 9 wherein the operating conditions sensed comprise cutting load.

27. A method of monitoring operation of a gear shaper apparatus to locate faults in real time, said method comprising the steps of:

providing a graphical depiction of the gear shaper apparatus on a video display;

physically sensing present operating conditions of the gear shaper apparatus as the gear shaper apparatus operates; and

presently displaying an indication of the physically sensed present conditions of the gear shaper apparatus on the graphical depiction of the gear shaper apparatus such that the indication indicates the location of the fault on the gear shaper apparatus.

28. A method as recited in claim 27 wherein the graphical depiction of the gear shaper apparatus is an outline of the gear shaper apparatus.

29. The method of claim 27 wherein the operating conditions sensed are selected from the group comprising hydraulic fluid reservoir fluid level, hydraulic fluid temperature, accumulator precharge pressure level, front splash guard position, rear splash guard position, change gear door position, coolant level, stroke door position, fixture pressure, stroke position, motor overload, hydraulic fluid filter contamination and hydraulic fluid supply pressure.

30. The method of claim 27 wherein the operating conditions sensed comprise hydraulic fluid reservoir fluid level.

31. The method of claim 27 wherein the operating conditions sensed comprise hydraulic fluid temperature.

32. The method of claim 27 wherein the operating conditions sensed comprise accumulator precharge pressure level.

33. The method of claim 27 wherein the operating conditions sensed comprise front splash guard position.

34. The method of claim 27 wherein the operating conditions sensed comprise rear splash guard position.

35. The method of claim 27 wherein the operating conditions sensed comprise change gear door position.

36. The method of claim 27 wherein the operating conditions sensed comprise coolant level.

37. The method of claim 27 wherein the operating conditions sensed comprise stroke door position.

38. The method of claim 27 wherein the operating conditions sensed comprise fixture pressure.

39. The method of claim 27 wherein the operating conditions sensed comprise stroke position.

40. The method of claim 27 wherein the operating conditions sensed comprise motor overload.

41. The method of claim 27 wherein the operating conditions sensed comprise hydraulic fluid filter contamination.

42. The method of claim 27 wherein the operating conditions sensed comprise hydraulic fluid supply pressure.

43. The method of claim 27 wherein the operating conditions sensed comprise cutting load.

44. A monitoring system for monitoring use of a gear shaper apparatus having a cutting tool, comprising:

a sensor for measuring hydraulic pressure to determine an amount of load applied by the cutting tool of the gear shaper apparatus during each of a plurality of workpiece cutting operations in which a plurality of workpieces are cut with the cutting tool;

a memory for storing measurements of load applied by the cutting tool as obtained by the sensor over time during each cutting operation of the gear shaper apparatus for the plurality of workpieces; and

a processor for processing the measurements of load obtained by the sensor and held in the memory to accumulate historical information regarding the use of the cutting tool, said accumulated historical information being based on load measurements obtained during the plurality of cutting operations.

45. The monitoring system of claim 44 further comprising a display for displaying real time indications of the measured load as the load is applied by the cutting tool.

46. The monitoring system of claim 45 wherein the display displays a graphical representation of the gear shaper apparatus.

47. The monitoring system as recited in claim 44 wherein the memory holds measurements of load applied by the cutting tool for a time frame elapsing between a first use of the cutting tool and a most recent use of the cutting tool.

48. A monitoring system as recited in claim 44 wherein the historical information comprises an indication of load trends over the life of the cutting tool.

49. A monitoring system as recited in claim 44 wherein the historical information indicates whether the cutting tool should be replaced with a new cutting tool.

50. A monitoring system as recited in claim 44 wherein the cutting tool is coupled to a hydro-mechanically stroked cutting spindle.

51. A monitoring system for monitoring use of a gear shaper apparatus having a cutting tool, comprising:

a sensor for measuring an amount of load applied by the cutting tool of the gear shaper apparatus during each of a plurality of workpiece cutting operations in which a plurality of workpieces are cut with the cutting tool;

a memory for storing measurements of load applied by the cutting tool as obtained by the sensor over time during each cutting operation of the gear shaper apparatus for the plurality of workpieces;

a processor for processing the measurements of load obtained by the sensor and held in the memory to accumulate historical information regarding use of the cutting tool, said accumulated historical information being based on load measurements obtained during the plurality of cutting operations; and

a display for displaying real time indications of the measured load as the load is applied by the cutting tool.

52. The monitoring system of claim 51 wherein the sensor senses hydraulic fluid pressure.

53. The monitoring system of claim 51 wherein the display displays a graphical representation of the gear shaper apparatus.

54. The monitoring system as recited in claim 51 wherein the memory holds measurements of load applied by the cutting tool for a time frame elapsing between a first use of the cutting tool and a most recent use of the cutting tool.

55. The monitoring system as recited in claim 51 wherein the historical information comprises an indication of load trends over the life of the cutting tool.

56. A monitoring system as recited in claim 51 wherein the historical information indicates whether the cutting tool should be replaced with a new cutting tool.

57. A monitoring system as recited in claim 51 wherein the cutting tool is coupled to a hydro-mechanically stroked cutting spindle.

58. A monitoring system for indicating faults in a gear shaper apparatus in real time, comprising:

a video display;

sensing means positioned on the gear shaper apparatus for physically sensing present conditions of the gear shaper apparatus as the gear shaper apparatus operates; and

a microprocessor programmed to receive indications of the physically sensed present gear shaper apparatus condition and to generate a graphical depiction of the apparatus on the video display, said graphical depiction indicating where on the apparatus faults exist.