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然而,对于某些应用,使用扫描振镜冷消融的加工方式得到的精度与锥角是不够的。锥角是在切割缝的边界产生的,部分是因为激光能量密度在那里比较低,部分是因为材料在那里再沉积。对于这些应用,使用固定加工头、加工气体喷嘴和高精度轴是很有优势的。然而,轴的加速度和速度与扫描振镜相比是微不足道的。因此,激光引入的热量在固定加工头的应用中会比较多。即使是局部熔化材料也不能完全排除这种现象。尽管如此,可以依旧保持工件质量。与固体激光器和CO2激光器的“热”激光切割相比,超短脉冲确保引入的热量在时间和空间上是可控的。因此,仍然不会
However, for some applications, the accuracy and taper angle obtained with the cold ablation of the scanning galvo is not sufficient. The cone angle is created at the edge of the cutting seam, in part because the laser energy density is lower there, in part because the material is redeposited there. For these applications, it is advantageous to use fixed heads, process gas nozzles and high-precision axes. However, the acceleration and velocity of the shaft are negligible compared to the scanning galvanometer. Therefore, the heat introduced by the laser will be more in the application of fixed processing head. Even partial melting of the material can not completely rule out this phenomenon. In spite of this, you can still maintain the quality of the workpiece. Ultra-short pulses ensure that the heat introduced is temporally and spatially controllable compared to the “hot” laser cutting of solid and CO2 lasers. So still not