Method of operating a machine tool, a machine tool system and components thereof

• US 8,369,980 B2
• Filed: 07/31/2006
• Issued: 02/05/2013
• Est. Priority Date: 08/01/2005
• Status: Active Grant

• Current Assignee: Agie Charmilles SA (Georg Fischer AG), Charmilles Technologies SA (Georg Fischer AG)
• Original Assignee: Charmilles Technologies SA (Georg Fischer AG), AGI (Meadwestvaco Corporation)
• Inventors: Buhler, Ernst, Besson, Franck, D'Amario, Rino, Giandomenico, Nicola, Knaak, Reto, Lombardo, Rosario, Boccadoro, Marco
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): Rao, Sheela S
• Application Number:
  US11/496,340
• Publication Number:
  US 20070027570A1
• Time in Patent Office: 2,381 Days
• Field of Search: 700/19, 700/22, 700/162, 700/169, 219/69.11
• US Class Current: 700/162
• CPC Class Codes: B23H 7/02 Wire-cutting
• CPC Class Codes: B23H 7/04 Apparatus for supplying current to working gap; Electric circuits specially adapted therefor
• CPC Class Codes: B23H 7/20 for programme-control, e.g. adaptive programme-control systems in general G05B19/00

Abstract

A method of operating a machine tool, e.g., an electrical discharge machine, and a machine tool system with a machine, e.g. an electrical discharge machine, for machining a workpiece may include numerous configurable modules (DRIVE; GEN; CONTROL) to perform at least one of controlling, monitoring and carrying out of the machining of a workpiece. The modules (DRIVE; GEN; CONTROL) are arranged on the machine and are linked by a data network to a node for at least one of sending data to the node and receiving data from the node.

Claims

1. A method of operating an electrical discharge machine, the electrical discharge machine configured for machining a workpiece, the method comprising:

at least one of controlling, monitoring and carrying out of the machining of the workpiece by a plurality of configurable modules, said modules being arranged on the machine and being linked by a data network to a node;

at least one of sending data to said node and receiving data from said node by said modules;

receiving, by at least one of said modules, a software configuration instruction from said node, and

transforming, by said at least one of said modules, from an electrical discharge machine generator module into a motor drive module according to said received software configuration instruction, said electrical discharge machine generator module being configured to output machining pulses for machining the workpiece, and said motor drive module being configured to output a motor drive current for driving a motor of the electrical discharge machine.

2. The method as set forth in claim 1 wherein said node is adapted to manage data transfer to or from said modules for at least one of controlling and monitoring said modules.

3. The method as set forth in claim 1 wherein said modules comprise at least one of a generator module, a drive module and a machine control module.

4. The method as set forth in claim 1 wherein said modules comprise a generator module, a drive module, a machine control module, a DC module and a power supply module.

5. The method as set forth in claim 1, wherein at least one of said modules is supplied via said data network from said node with a feed voltage for power supply.

6. The method as set forth in claim 5 wherein said modules requiring for proper functioning a power supply of less than 50 W are powered exclusively via said data network from said node.

7. The method as set forth in claim 5 wherein said modules requiring for proper functioning a power supply of 50 W or more are additional powered by a suitable high DC voltage via a cable from said DC module.

8. The method as set forth in claim 7 wherein excess energy materializing in at least one module is stored in one or more capacitors connected to said high DC voltage and said stored energy is made use of in the module itself.

9. The method as set forth in claim 8 wherein said stored energy is made use of in another of said modules.

10. The method as set forth in claim 8, wherein said stored energy is returned from DC module via a power supply module into a power supply system and can be made use of by other consumers of said system.

11. The method as set forth in claim 1, wherein at least one of said modules comprises a configurable controller receiving via said node and the data network configuration data by means of which said module can be set to implement a predetermined function.

12. The method as set forth in claim 11 wherein said configurable controller fixedly defines an area for configuring said module, this area providing at least the communication with said node and an identification message to said node.

13. The method as set forth in claim 12 wherein said identification message is sent to said node as soon as the feed voltage supplied via said data network and supply voltages derived therefrom lie within a defined tolerance.

14. The method as set forth in claim 12 wherein after having received said identification message a selection of said configuration data is made, as derived therefrom, and the controller of the corresponding module is configured in a variable range via said node and said data network.

15. The method as set forth in claim 12 wherein said modules communicate at least one of their properties, operating data and fabrication data via said identification message.

16. The method as set forth in claim 12 wherein at least one of said modules is reconfigured in response to given requirements on a machining process during operation of said machine tool in the variable area of said configuration.

17. The method as set forth in claim 11 wherein after being configured in said variable range at least one of said modules satisfies the functions of a generator of a die-sinking electrical discharge machining machine.

18. The method as set forth in claim 11 wherein after being configured in said variable range at least one of said modules satisfies the functions of a generator of a wire-cutting electrical discharge machining machine.

19. The method as set forth in claim 11 wherein after being configured in said variable range at least one of said modules satisfies the functions of a drive module for motors and similar loads of a machine tool.

20. The method as set forth in claim 1 wherein said node is connected via at least one standardized interface to a numerical control, said numerical control performing at least one of coordinating, controlling and monitoring of said machine via said interface.

21. The method as set forth in claim 1 wherein at least one of processing and communicating data occurs in hierarchical levels as regards speed requirements such that the data processing hierarchy is staggered according to a reduction in speed, and at least one of open and closed loop control functions are implemented internally in at least one of said modules for a top speed requirement by one or more modules and a programmable logic circuit arranged in said node for a second speed requirement, and by one or more modules and a programmable logic circuit arranged in said node and a microprocessor arranged in said node for a third speed requirement.

22. The method as set forth in claim 1 wherein provided in said node is a stand-alone fine interpolator comprising a memory and a controller, said stand-alone fine interpolator receiving via a standardized interface from a coarse interpolator at least one of conditioned geometry data and control commands, storing it in said memory and performing at least one of coordinating, controlling and monitoring said machine with no delay in response to said stored geometry data or control commands.

23. The method as set forth in claim 22 wherein setting up, operating or trouble-shooting said machine is done with a manual operator device connected to the node and powered by said node.

24. The method of claim 1, wherein said modules are linked by a serial data network to said node.

25. An electrical discharge machining system, comprising a machine for machining a workpiece and a plurality of configurable modules, wherein at least one of controlling, monitoring and carrying out of the machining of the workpiece is performed by said modules, wherein said modules are arranged on the machine, and said modules are linked by a data network to a node for at least one of sending data to said node and receiving data from said node, and at least one of said modules is configured to transform from an electrical discharge machine generator module that is configured to output machining pulses for machining the workpiece into a motor drive module that is configured to output a motor drive current for driving a motor of the electrical discharge machine by a software configuration instruction communicated to said at least one module from said node.

26. The electrical discharge machining system as set forth in claim 25 wherein said data network is a star network relative to said node.

27. The electrical discharge machining system as set forth in claim 25 wherein said node comprises a plurality of configurable ports.

28. The electrical discharge machining system as set forth in claim 25 wherein said node comprises a source for powering at least one of said modules via said data network.

29. The electrical discharge machining system as set forth in claim 25 wherein said node provides a plurality of standardized ports for a local area network.

30. The electrical discharge machining system as set forth in claim 25 wherein said modules comprise a generator module, a drive module and a machine control module.

31. The electrical discharge machining system as set forth in claim 30, wherein said drive module further comprises a motor forming an assembly.

32. The electrical discharge machining system as set forth in claim 25 wherein said modules comprise a generator module, a drive module, a machine control module, a DC module and a power supply module.

33. The electrical discharge machining system as set forth in claim 32 wherein at least one of the drive modules is arranged in the vicinity of an axis motor.

34. The electrical discharge machining system as set forth in claim 32 wherein at least one of said generator module and a module for monitoring a spark gap is arranged in the vicinity of a working gap formed between a machining electrode and the workpiece in said electrical discharge machining system.

35. The electrical discharge machining system as set forth in claim 25 wherein said node comprises a plurality of standardized configurable ports.

36. The electrical discharge machining system as set forth in claim 35 wherein at least one of said configurable ports is configurable in response to an identification message of the associated module.

37. The electrical discharge machining system as set forth in claim 25 wherein excess energy materializing in at least one module is stored in one or more capacitors connected to said high DC voltage and said stored energy is made use of in the module itself.

38. The electrical discharge machining system as set forth in claim 25 wherein at least one of said modules comprises a configurable controller receiving via said node and the data network configuration data by means of which said module can be set to implement a predetermined function.

39. The electrical discharge machining system as set forth in claim 38 wherein said configurable controller fixedly defines an area for configuring said module, this area providing at least the communication with said node and an identification message to said node.

40. The electrical discharge machining system as set forth in claim 25 wherein said node is connected via at least one standardized interface to a numerical control, said numerical control performing at least one of coordinating, controlling and monitoring said machine via said interface.

41. The electrical discharge machining system as set forth in claim 25 further comprising in said node a stand-alone fine interpolator comprising a memory and a controller, said stand-alone fine interpolator receiving via a standardized interface from a coarse interpolator at least one of conditioned geometry data and control commands, storing it in said memory and performing at least one of coordinating, controlling and monitoring said machine with no delay in response to said stored geometry data or control commands.

42. The electrical discharge machining system of claim 25, wherein said modules are linked by a serial data network to said node.

43. The electrical discharge machining system as set forth in claim 25, further comprising a generator module for generating pulses by means of discharging pulse capacitors, said generator module comprising:

a data link to said node which also provides a feed voltage input, a programmable controller, a bipolar current source, at least one charge and discharge circuit for at least one pulse capacitor comprising a sensor, and one or more inverter circuits including one or more isolating transformer(s).

44. The electrical discharge machining system as set forth in claim 43 wherein in addition a DC voltage input is provided for the supply with increased power and for exchanging excess energy with other modules.

45. The electrical discharge machining system as set forth in claim 43 wherein said bipolar current source and said charge and discharge circuit are designed for bidirectional energy flow for returning excess energy materializing in a module to said DC voltage input.

46. The electrical discharge machining system as set forth in claim 43 wherein said programmable controller is designed so that it comprises a hardwired configuration area via which the communication with said node and an identification message to said node is assured.

47. The electrical discharge machining system as set forth in claim 46 wherein said programmable controller is designed so that after configuration of said node it receives via said data link at least one of control commands, setting data, setpoint values and timing signals to control said generator module during operation of the machine tool.

48. The electrical discharge machining system as set forth in claim 46 wherein said programmable controller is designed so that after configuration of said node it sends via said data link and said node at least one of measurement values, operating data, timing signals, alarms and trouble-shooting information to warn, and/or to inform and/or to coordinate and/or to control other modules and/or said numerical control during operation.

49. The electrical discharge machining system as set forth in claim 43 wherein said programmable controller is designed so that it comprises a variable configuration area via which programmed functions of said module are defined, and/or coordinated.

50. The electrical discharge machining system as set forth in claim 43 wherein said module is shielded from the environment by a case.