Laser machining apparatus and method of setting focus thereof

Details Laser machining apparatus and method of setting focus thereof Laser machining apparatus and method of setting focus thereof

1994-03-08

1997-04-29

Evans, Geoffrey S.

Electric heating

Metal heating

By arc

21912175, B23K 2604

Patent

active

056245874

ABSTRACT:
The focus of a laser machining apparatus is set by reading a program for setting the focus of the laser beam on a workpiece; irradiating the workpiece with the laser beam according to the program for setting the focus; moving a machining lens relative to the workpiece while keeping constant the distance between the machining head and the surface of the workpiece; detecting information regarding the relative distance between the machining lens and the workpiece; judging that the laser beam has focused on the workpiece when the detected relative distance information has exceeded a predetermined range and when a blue flame occurs; and storing the position information of the machining lens at the time when it is judged that the laser beam has focused on the workpiece.

REFERENCES:
patent: 4358659 (1982-11-01), Sponheimer
patent: 5061839 (1991-10-01), Matsuno et al.
patent: 5239159 (1993-08-01), Masuda
patent: 5334816 (1994-08-01), Sugiyama

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