Electric heating – Metal heating – By arc
Patent
1994-08-16
1998-12-22
Walberg, Teresa J.
Electric heating
Metal heating
By arc
21912172, 21912153, B23K 2608
Patent
active
058522760
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a laser machining resuming method of resuming laser machining which is interrupted while it is being carried out.
2. Description of the Related Art
A laser machining resuming method of resuming laser machining which is interrupted due to burning and the like while it is being carried out is one of the most important problems for automatically carrying out laser machining. As the laser machining resuming method, there is conventionally known a method by which, when laser machining is interrupted due to the occurrence of abnormal machining and the like, a machining head is once retracted in a Z-axis direction and machining is carried out again at the position where the laser machining is interrupted to resume the laser machining.
Nevertheless, even if machining is stopped by detecting abnormal machining and the like, a problem arises in that since a machine cannot stop at once, there remains an unmachined portion before the machining head completely stops. In the above prior art, machining is resumed from the aforesaid state. Therefore, laser machining cannot be resumed well or even if it can be resumed, the unmachined portion is left because the cause of the abnormal machining remains as it is.
SUMMARY OF THE INVENTION
Taking the above into consideration, an object of the present invention is to provide a laser machining resuming method capable of securely resuming laser machining without leaving an unmachined portion.
To solve the above problem, according to the present invention, there is provided a laser machining resuming method of resuming laser machining when the laser machining is interrupted while it is being carried out, comprising the steps of interrupting the laser machining when abnormal machining is sensed while the laser machining is being carried out, storing a position where the laser machining is carried out when the abnormal machining is sensed as well as retracting a machining head a predetermined distance, moving the machining head backward a predetermined distance along a machining path along which the laser machining has been executed until the occurrence of interruption of the laser machining on the completion of the retraction, causing the machining head to approach a workpiece on the completion of the backward movement, resuming the laser machining on the completion of the approach and moving forward the machining head along the machining path along which the laser machining has been executed until the occurrence of interruption of the laser machining, determining whether the machining head has passed through the machining position where the abnormal machining was sensed, repeating a retry processing including the processes from the interruption of the laser machining to the forward movement of the machine head due to the resume of the laser machining when the abnormal machining is sensed again before the machining head passes through the machining position where the abnormal machining was sensed, and skipping the machining block and starting the laser machining from a next machining block when the number of repetition of the retry processing has reached the predetermined number of times.
When abnormal machining is sensed while laser machining is being carried out, a retry processing is started to resume the laser machining. That is, first, the CNC (numerical control apparatus) interrupts the laser machining in response to an abnormal machining sensing signal and stores a machining position at the time as well as retracts the machining head a predetermined distance. On the completion of the retraction, the CNC moves the machining head backward a predetermined distance along the machining path along which the laser machining has been executed until the occurrence of interruption of the laser machining. On the completion of the backward movement, the CNC causes the machining head to approach the workpiece. On the completion of the approach, the CNC resumes the laser machining and moves the machi
REFERENCES:
patent: 5293024 (1994-03-01), Sugahara et al.
Masuda Teruo
Yamazaki Etsuo
Fanuc Ltd
Mills Gregory L.
Walberg Teresa J.
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