| 摘要 |
PURPOSE:To stop temporarily laser light upon detection of a local overcombustion state during cutting and to prevent formation of a rough section on the cut surface by attaching >=1 piece of detector to the condensing shaft of a laser cutting device and detecting the quantity of light at the working point. CONSTITUTION:Two detectors 8a, 8b spaced from each other at 90 deg. are attached by means of support fittings to the condensing shaft 1 for laser light to detect the quantity of the light generated from the laser working point in the stage of moving the laser light 3 condensed with a condenser lens onto a plate 4 to be worked and cutting the plate. If any combustible material such as paint, iron powder, buts and oils or the like exists on the surface of the plate 4, a local overcombustion state is generated at that point and a rough section 6 is formed in a cutting line 5. The formation of such surface is prevented by detecting the quantity of the light in the working part which is increased several times by the detctors 8a, 8b, stopping temporarily the emission of the light 3 in accordance with the detection signals thereof and restarting the cutting by the laser light after the cut surface cools. The successive formation of the section 6 is thus prevented. |
