Laser beam machining method

Details Laser beam machining method Laser beam machining method

1992-05-29

1993-10-12

Albritton, C. L.

Electric heating

Metal heating

By arc

21912161, B23K 2600

Patent

active

052528057

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
This invention relates to a laser beam machining method used for cutting a workpiece, and more particularly, to a laser beam machining method enabling a clean-cut machining of an acute-angle portion.
2. Background Art
When cutting a workpiece to form an acute-angle portion by using a laser beam, often a clean-cut machining cannot be achieved because an edge of the acute-angle portion is overheated and melted due to an excessive heating of that portion, and therefore, a loop machining method, as illustrated in FIG. 7, is employed. As shown in the figure, when carrying out a cutting operation along a machining path 52 including an acute-angle portion 51, the cutting is continued past a point C of the acute angle, the cutting point is moved along a predetermined loop 53 and returned to the point C, and the cutting operation then restarted along the original machining path 52.
Although this loop machining method can be applied to a case in which a product to be obtained is an acute-angle piece inside the machining path 52, it has a drawback in that it cannot be applied to a case in which the product is an obtuse-angle piece outside the machining path 52, and further, an extra machining program is required for the movement of the cutting point along the loop 53.


DISCLOSURE OF THE INVENTION

This invention was created in view of the above circumstances, and an object thereof is to provide a laser beam machining method enabling a clean-cut machining of an acute-angle portion without using the loop machining method.
To achieve the above object, this invention provides 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 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.
An angle of the machining path is calculated on the basis of a move command under execution and the subsequent move command read out. The angle of the machining path is compared with the preset angle, and when the former is more acute than the latter, the movement for machining based on the move command under execution is decelerated and stopped. In this case, the laser output command is changed from the cutting condition to the piercing condition, to carry out a piercing operation according to the piercing condition, and when the piercing operation is completed, the movement for machining is restarted in accordance with the next 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.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1(a) is a flowchart of a deceleration determination process according to a laser beam machining method of this invention;
FIG. 1(b) is a flowchart of a laser output command rewrite process according to the laser beam machining method of this invention;
FIG. 2 is a block diagram illustrating the laser beam machining method of this invention;
FIG. 3 is a timing chart illustrating the laser beam machining method of this invention;
FIG. 4 is a timing chart illustrating a laser beam machining method according to another embodime

REFERENCES:
patent: 5182434 (1993-01-01), Nakata

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