US5252805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser beam machining method
Assignee: Fanuc Corp
•
Filing: 1991-10-05
•
Granted: 1993-10-12
•
Expires: 2011-10-05
Abstract
Abstract A laser beam machining method for cutting a workpiece in accordance with a machining program composed of a succession of move commands and laser output commands. An angle of a machining path is calculated on the basis of a move command under execution and a subsequent read out move command (S2, S3). The angle of the machining path is compared with a preset angle (S4), and when the angle of the machining path is more acute than the preset angle, the movement for machining based on the move command under execution is decelerated and stopped (S5). In this case, the laser output command is changed from a cutting condition to a piercing condition, to carry out a piercing operation, and when the piercing operation is completed, the movement for machining is restarted in accordance with the subsequent move command. When the movement for machining is restarted, the laser output command is changed from the piercing condition to the cutting condition in accordance with the movement for machining. Accordingly, a clean-cut acute-angle portion can be obtained by this machining.
Inventors
- 👤 Yoshinori Nakata
- 👤 Etsuo Yamazaki
- 👤 Norio Karube
- 👤 Tsuyoshi Nagamine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:52
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/416; G05B19/4163; B; B23; B23K; B23K26/00; B23K26/08; B23K26/083; B23K26/0838; B23K26/36; B23K26/38; B23K26/382; G05B2219/00; G05B2219/30; G05B2219/35; G05B2219/35249; G05B2219/43; G05B2219/43129; G05B2219/43147; G05B2219/45; G05B2219/45165
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
168 words
A laser beam machining method for cutting a workpiece in accordance with a machining program composed of a succession of move commands and laser output commands, comprising the steps of: calculating an angle of a machining path in accordance with a move command under execution and a subsequent read out move command; comparing the angle of the machining path with a preset angle; decelerating and stopping a movement for a machining based on the move command under execution, when the angle of the machining path is more acute than the preset angle; changing the laser output command from a cutting condition to a piercing condition in accordance with the deceleration and stoppage of the movement for machining; restarting the movement for machining in accordance with the subsequent move command when a piercing operation according to the piercing condition is completed; and changing the laser output command from the piercing condition to the cutting condition in accordance with the movement for machining, when the movement for machining is restarted.
Claim 2
Dependent Claim
168 words
A laser beam machining method for cutting a workpiece in accordance with a machining program composed of a succession of move commands and laser output commands, comprising the steps of: calculating an angle of a machining path in accordance with a move command under execution and a subsequent read out move command; comparing the angle of the machining path with a preset angle; decelerating and stopping a movement for a machining based on the move command under execution, when the angle of the machining path is more acute than the preset angle; changing the laser output command from a cutting condition to a piercing condition in accordance with the deceleration and stoppage of the movement for machining; restarting the movement for machining in accordance with the subsequent move command when a piercing operation according to the piercing condition is completed; and changing the laser output command from the piercing condition to the cutting condition in accordance with the movement for machining, when the movement for machining is restarted.
Claim 3
Dependent Claim
47 words
A laser beam machining method according to claim 1, wherein, when the movement for machining is decelerated and stopped, the laser output command is changed linearly from the cutting condition to the piercing condition in accordance with a change of a deceleration of the movement for machining.
Claim 4
Dependent Claim
71 words
A laser beam machining method according to claim 1, wherein, when the movement for machining is decelerated and stopped, the laser output command is changed from the cutting condition to an intermediate condition, between the cutting condition and the piercing condition, during the deceleration of the movement for machining, in accordance with a change in the deceleration, and is switched to the piercing condition when the movement for machining is stopped.
Claim 5
Dependent Claim
46 words
A laser beam machining method according to claim 1, wherein, when the movement for machining is decelerated and stopped, the laser output command is maintained at the cutting condition during the deceleration, and is switched to the piercing condition when the movement for machining is stopped.
Claim 6
Dependent Claim
46 words
A laser beam machining method according to claim 1, wherein, when the movement for machining is restarted, the laser output command is changed linearly from the piercing condition to the cutting condition in accordance with a change in a feed speed of the movement for machining.
Claim 7
Dependent Claim
42 words
A laser beam machining method according to claim 1, wherein, when the movement for machining is restarted, the laser output command is changed from the piercing condition to the cutting condition in accordance with a movement for machining over a predetermined distance.
Claim 8
Dependent Claim
28 words
A laser beam machining method according to claim 1, wherein the laser output command includes at least one of factors related to power, pulse frequency, and pulse duty.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-11 | 1997-04-12 | 1997-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-11 | 2001-04-12 | 2001-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-11 | 2005-04-12 | 2005-10-12 | $7700.00 | Window Closed / Lapsed |