Electric heating – Metal heating – By arc
Patent
1995-05-08
2000-08-08
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
21912161, 21912171, B23K 2600
Patent
active
061004987
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a piercing control method for controlling piercing during cutting operation by means of a laser beam, and more particularly, to a piercing control method for controlling a piercing start time.
BACKGROUND ART
In general, when cutting a metal or the like by using a laser beam, piercing is carried out at an initial cutting start point. The piercing is performed by irradiating a laser beam after a machining head is accurately placed at a piercing position.
FIG. 6 is a diagram illustrating the conventional piercing control mentioned above. In the figure, the horizontal axis indicates time t and the vertical axis indicates the speed V of movement of the machining head. After a previous cutting operation is completed, the machining head is accelerated from time t.sub.0 to time t.sub.10, then moved at a fixed speed from time t.sub.10 to time t.sub.20, and decelerated from time t.sub.20 to time t.sub.30, so as to be moved to the next cutting start point. Subsequently, positioning at the cutting start point is checked during a time period t.sub.30 -t.sub.40, and when the positioning completion is confirmed at time t.sub.40, piercing is carried out at that position. Simultaneously with completion of the piercing at time t.sub.50, the subsequent cutting operation is started. The interval t.sub.0 -t.sub.40 is a time period during which the machining head is moved to the next machining start point, the interval t.sub.40 -t.sub.50 is a time period for the piercing, and the cutting time period starts from t.sub.50.
Thus, the conventional piercing requires the time period t.sub.30 -t.sub.40 for confirmation of the positioning completion after deceleration according to motion control is ended.
Piercing is a machining operation executed at a start point for pre-machining within a portion that is irrelevant to the final shape of products, and accordingly, the piercing position need not be strictly set.
However, since the positioning for piercing is carried out with accuracy, as described above, the positioning requires the considerable time t.sub.30 -t.sub.40, which is not negligible in cases where shorter machining time is demanded.
DISCLOSURE OF THE INVENTION
The present invention was created in view of the above circumstances, and an object thereof is to provide a piercing control method by which the time period required for piercing can be made substantially zero.
To achieve the above object, the present invention provides a piercing control method for controlling piercing during a cutting operation by means of a laser beam, wherein a laser output command for the piercing is issued upon lapse of a predetermined time after a deceleration start time during motion control of a machining head executed from a cutting end position to a subsequent cutting start position.
The machining head is subjected to the motion control from a cutting end position to a subsequent cutting start position. The laser output command for the piercing is issued upon passage of a predetermined distance from the deceleration start position during the motion control.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram illustrating a piercing control method according to the present invention;
FIG. 2 is a block diagram of an NC laser device to which the piercing control method of the present invention is applied;
FIG. 3 is a flowchart of a process for carrying out the present invention;
FIG. 4 is a flowchart of a process for carrying out a second embodiment of the present invention;
FIG. 5 is a flowchart of a process for carrying out a third embodiment of the present invention; and
FIG. 6 is a diagram illustrating conventional piercing control.
BEST MODE OF CARRYING OUT THE INVENTION
Embodiments according to the present invention will be hereinafter described with reference to the drawings.
FIG. 2 is a block diagram of an NC laser device to which a piercing control method according to the present invention is applied. A processor 1 reads a machining program stored in a memory (RAM) 3 and co
REFERENCES:
patent: 5252805 (1993-10-01), Nakata et al.
patent: 5444211 (1995-08-01), Nakata et al.
Evans Geoffrey S.
Fanuc Ltd.
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