Claims
- 1. An electrical discharge machine for applying a pulsed voltage to a machining gap located between an electrode and a workpiece disposed in a dielectric fluid medium made of water and another compound or in an oil medium, in order to generate a discharge for machining the workpiece with the energy of the discharge, comprising:
- a machining pulse control apparatus for applying a first polarity pulsed voltage to said gap during a machining operation, and for applying a second polarity voltage to said gap having a polarity opposite to said first polarity voltage in a machining stop period when machining is not performed;
- moving means for moving said electrode away from and toward said workpiece during a jump operation;
- a jump operation control apparatus for synchronizing application of said second polarity voltage during said jump operation to remove debris from said electrode and said workpiece.
- 2. An electrical discharge machine for applying a pulsed voltage to a machining gap located between an electrode and a workpiece disposed in a dielectric fluid medium made of water and another compound or in an oil medium, in order to generate a discharge for machining the workpiece with the energy of the discharge, comprising:
- a machining pulse control apparatus for applying a first polarity pulsed voltage to said gap during a machining operation, and for applying a second polarity voltage to said gap having a polarity opposite to said first polarity voltage in a machining stop period when machining is not performed;
- moving means for moving said electrode away from and toward said workpiece during a jump operation;
- a jump operation control apparatus for synchronizing application of a low-frequency, alternating-current voltage during said jump operation to remove debris from said electrode and said workpiece.
- 3. An electrical discharge machine for applying a pulsed voltage to a machining gap located between an electrode and a workpiece disposed in a dielectric fluid medium made of water and another compound or in an oil medium, in order to generate a discharge for machining the workpiece with the energy of the discharge, comprising:
- a machining pulse control apparatus for applying a first polarity pulsed voltage to said gap during a machining operation, and for applying a second polarity voltage to said gap having a polarity opposite to said first polarity voltage in a machining stop period when machining is not performed;
- moving means for moving said electrode away from and toward said workpiece during a jump operation;
- a jump operation control apparatus for adaptively synchronizing application of a direct current voltage during said jump operation to remove debris from said electrode and said workpiece.
- 4. A method for controlling the application of a pulsed voltage to a machining gap formed between an electrode and a workpiece disposed opposite thereto in an insulating dielectric fluid medium in order to generate a discharge operative to machine the workpiece with the energy of the discharge, comprising:
- applying a first polarity pulsed voltage during a machining operation, and
- applying a second polarity voltage during a jump operation of said electrode.
- 5. A method as set forth in claim 4, further comprising:
- applying a second polarity voltage at a stop period of said first polarity pulsed voltage, and
- applying a low-frequency, alternating current voltage during said jump operation.
- 6. A method as set forth in claim 5, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 7. A method as set forth in claim 5, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
- 8. A method as set forth in claim 5, comprising:
- periodically moving said electrode away from and toward said workpiece during said jump operation.
- 9. A method as set forth in claim 8, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 10. A method as set forth in claim 8, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
- 11. A method as set forth in claim 4, further comprising:
- applying a second polarity voltage at a stop period of said first polarity pulsed voltage, and
- applying a direct current voltage during said jump operation.
- 12. A method as set forth in claim 11, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 13. A method as set forth in claim 11, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
- 14. A method as set forth in claim 11, comprising:
- periodically moving said electrode away from and toward said workpiece during said jump operation.
- 15. A method as set forth in claim 14, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 16. A method as set forth in claim 14, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
- 17. A method as set forth in claim 11, further comprising:
- adaptively controlling an amount of said direct current voltage applied during said jump operation.
- 18. A method as set forth in claim 17, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 19. A method as set forth in claim 17, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
- 20. A method as set forth in claim 17, comprising:
- periodically moving said electrode away from and toward said workpiece during said jump operation.
- 21. A method as set forth in claim 20, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 22. A method as set forth in claim 20, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
- 23. A method as set forth in claim 4, further comprising:
- asserting said second polarity voltage for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 24. A method as set forth in claim 4, further comprising:
- asserting said second polarity voltage for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
- 25. A method as set forth in claim 14, comprising:
- periodically moving said electrode away from and toward said workpiece during said jump operation.
- 26. A method as set forth in claim 25, further comprising:
- asserting said second polarity voltage for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 27. A method as set forth in claim 25, further comprising:
- asserting said second polarity voltage for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
- 28. A method as set forth in claim 4, wherein said first polarity pulsed voltage is of negative polarity and said second polarity voltage is a positive polarity voltage.
- 29. A method as set forth in claim 28, further comprising:
- asserting said second polarity voltage for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 30. A method as set forth in claim 28, further comprising:
- asserting said second polarity voltage for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
- 31. A method as set forth in claim 28, comprising:
- periodically moving said electrode away from and toward said workpiece during said jump operation.
- 32. A method as set forth in claim 31, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at a predetermined voltage.
- 33. A method as set forth in claim 31, further comprising:
- asserting said second polarity voltage during said stop period for a period of time sufficient to maintain the voltage across said machining gap at zero voltage.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-162725 |
Jun 1993 |
JPX |
|
Parent Case Info
This is a divisional of application Ser. No. 08/267,233, filed Jun. 29, 1994.
US Referenced Citations (5)
Foreign Referenced Citations (17)
Number |
Date |
Country |
0488187 |
Jun 1992 |
EPX |
0545156 |
Jun 1993 |
EPX |
3300552 |
Sep 1983 |
DEX |
3535512 |
Apr 1986 |
DEX |
3117814 |
Mar 1988 |
DEX |
3790717 |
Nov 1993 |
DEX |
53-145195 |
Dec 1978 |
JPX |
59-93228 |
May 1984 |
JPX |
61-50714 |
Mar 1986 |
JPX |
63-102825 |
May 1988 |
JPX |
3196916 |
Aug 1991 |
JPX |
3208520 |
Sep 1991 |
JPX |
3239413 |
Oct 1991 |
JPX |
4101722 |
Apr 1992 |
JPX |
4331020 |
Nov 1992 |
JPX |
6-71517 |
Mar 1994 |
JPX |
WO9203246 |
Mar 1992 |
WOX |
Non-Patent Literature Citations (1)
Entry |
M. Weck: "Digitale adaptive Regelung des Funkenerosionsprozesses (Digital adaptive control of the electrical discharge process)", in VDI-Z, Feb. 2, 1989, No. 2, pp. 39-44. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
267233 |
Jun 1994 |
|