| 摘要 |
<p>In the method for cutting material, use is made of a laser which is pulsed with a frequency above 1 kHz, the material being removed by the juxtaposition of relatively small bores, and the contour of the path being traversed several times in order to smooth the edges between the individual bores. In a particular exemplary embodiment for producing holes in magnetisable plates for the rotor of micro motors, use is made of a continuous wave laser having an acousto-optical Q-switch cell which is operated at a frequency of 2500 - 3500 Hz, the ratio of the off period to the on period is 250 - 350 : 1, in order to prevent the Curie temperature from being reached in the material. Apart from the YAG neodym continuous wave laser and the acousto-optical Q-switch cell, the device for carrying out the method has a rotatably mounted machining optical system (3), which is driven by a motor (11) and contains a wedge plate (14) and a downstream focusing optical system (5). Such a method and the matching device permit contours, especially holes, to be produced which can be further processed without intermediate machining such as granulation. <IMAGE></p> |
