| 摘要 |
PURPOSE:To prevent defective cutting and to improve cutting efficiency by increasing the cutting speed by stages at the time of starting cutting when the cutting speed is shifted from an unstationary state to a stationary state and at work corner parts. CONSTITUTION:A laser beam 2 oscillated from a laser beam oscillator 1 is led to a machining head 4 and while assisting gas from an assisting gas feeder 8 being regulated, a work 7 is cut. At this time, at the time of starting cutting after piercing the work 7 and at points (b)-(f) of the corner parts of the work 7, an NC device 16 is controlled to execute setting so that a speed command signal is increased by stages from a value of 10%, etc., of the stationary speed and the speed of 100% is attained when the cutting speed gets to the stationary state. Since the cutting speed is increased by stages at the cutting starting point and the rise points of the corner parts, blowing-up at the time of cutting is prevented. Since the cutting speed is increased, the occurrence of defective cutting is prevented and cutting efficiency is also improved. |
