Electric heating – Metal heating – By arc
Patent
1994-09-30
1996-07-16
Evans, Geoffrey S.
Electric heating
Metal heating
By arc
21912174, 21912178, 356153, B23K 2604, G01B 1127
Patent
active
055369162
ABSTRACT:
Automatic alignment correction of the setting angles of mirrors in a laser robot is achieved by mirrors 2c,2d, and 2e being linearly displaced a predetermined distance in a sequence from one closer to a laser oscillator 1 to another. At the same time, a locus of displacement of a spot S on a position sensor during movement of a particular mirror is detected by the position sensor 9 disposed in front of a laser output nozzle 4. An error in the setting angle of a mirror preceding to the particular mirror having been moved is computed on the basis of the detected value, so as to perform angular correction relative to the particular mirror by motors 11a and 11b. In one embodiment, mirror 2e is rotated about the C-axis. When the incident position of the laser beam is offset from the center of rotation of the mirror 2e, the spot S obtained in the position sensor 9 will move in a circular path. The center of the circle is determined and the setting angle of the mirror 2c is adjusted so that the spot S comes to the center. Because of this modification in the setting angle of mirror 2c, the optical axis between mirrors 2d and 2e is again out of parallel to the Z-axis. This operation is then repeated to minimize the size of the spot S. By this sequence, the laser beam incident to the mirror 2e is accurately directed to the center of the mirror 2e in parallel with the C-axis.
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Ishihara Koichi
Kohari Toshio
Takata Ryuichiro
Evans Geoffrey S.
Sanyo Machine Works, Ltd.
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