| 摘要 |
PURPOSE:To improve machining efficiency at the time of changing the duty ratio of an oscillation pulse of a laser beam oscillator by increasing change rate in the region of the high duty ratio and decreasing in the region of the low duty ratio. CONSTITUTION:At the time of decreasing gradually the oscillation pulse from a high value to a low value, a present value of the duty ratio is decreased at the maximum change rate (a), at the intermediate change rate (b) and at the minimum change rate (c) in the region from 100 to D1%, in the region from D1 to D2% and in the region lower than D2%, respectively. By this method, the duty regions are determined by the preset duty values D1 and D2 and the duty ratio can be changed at the maximum speed where an arc is not discharged at each region and machining efficiency is improved to that extent. |
