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没有冲压装置的激光切割机有两种穿孔的基本方法

脉冲穿孔:(Pulse drilling)


Pulse piercing: (drilling Pulse)


采用高峰值功率的脉冲激光使少量材料熔化或汽化,常用空气或氮气作为辅助气体,以减少因放热氧化使孔扩展,气体压力较切割时的氧气压力小。每个脉冲激光只产生小的微粒喷射,逐步深入,因此厚板穿孔时间需要几秒钟。一旦穿孔完成,立即将辅助气体换成氧气进行切割。


The pulse laser with high peak value is used for melting or vaporization of a small amount of material, air or nitrogen gas is used as an auxiliary gas to reduce the heat release and the oxygen pressure of the gas pressure is smaller than the oxygen pressure during the cutting process. Each pulse laser produced only a small particle injection, and gradually deepened, so thick plate perforation time takes a few seconds. Once the perforation is completed, the auxiliary gas is changed to oxygen for cutting.


这样穿孔直径较小,其穿孔质量优于爆破穿孔。为此所使用的激光器不但应具有较高的输出功率;更重要的时光束的时间和空间特性,因此一般横流CO2激光器不能适应激光切割的要求。此外脉冲穿孔还须要有较可靠的气路控制系统,以实现气体种类、气体压力的切换及穿孔时间的控制。


The perforation diameter is smaller and the perforation quality is better than that of the blasting hole. The laser used in this system should not only have high output power, but also the time and space characteristics of the time, so the general cross flow CO2 laser can not meet the requirement of laser cutting. In addition, a more reliable pneumatic control system is needed in order to realize the gas type, gas pressure switch and perforation time control.


爆破穿孔:(Blast drilling)


Blasting perforation: (drilling Blast)


材料经连续激光的照射后在中心形成一凹坑,然后由与激光束同轴的氧流很快将熔融材料去除形成一孔。一般孔的大小与板厚有关,爆破穿孔平均直径为板厚的一半,因此对较厚的板爆破穿孔孔径较大,且不圆,不宜在要求较高的零件上使用(如石油筛缝管),只能用于废料上。此外由于穿孔所用的氧气压力与切割时相同,飞溅较大。


The material is formed into a concave hole at the center of the center after the continuous laser irradiation, and the oxygen flow in the coaxial with the laser beam is then quickly removed to form a hole. Hole with the size of the plate thickness, blasting perforation average diameter is half of the plate thickness, so for thick plate blasting perforation diameter larger diameter, not in the higher parts use (such as petroleum slotted screen pipe), can only be used for waste. In addition, because of the same pressure and the cutting of the perforation, the larger the splash.

 

 

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