Oxygen-assisted multipass cutting of carbon fiber reinforced plastics with ultra-short laser pulses
Oxygen-assisted multipass cutting of carbon fiber reinforced plastics with ultra-short laser pulses
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DOI：
10.1063/1.4868385
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发表时间：
2014-03
影响因子：
3.2
通讯作者：
T. Kononenko;C. Freitag;M. Komlenok;V. Onuseit;R. Weber;T. Graf;V. Konov
中科院分区：
文献类型：
--
作者：
T. Kononenko;C. Freitag;M. Komlenok;V. Onuseit;R. Weber;T. Graf;V. Konov
研究了皮秒激光脉冲在不同静态气氛下以及在氧气或氮气流的辅助下对双向和单向碳纤维增强塑料（CFRP）的多道深切割。烧蚀速率作为切口深度的函数来确定，并测量了由此产生的热影响区。研究发现，辅助氧气流可以显著提高切割生产率，但仅在深切口中，由于到达切口底部的激光能量减少，蒸发烧蚀的减少不再是反应刻蚀的主要贡献。氧气支持切割也被证明可以解决平行于纤维方向切割CFRP时出现的问题，在这种情况下，在标准空气环境中，切割时会产生强烈的变形和变宽的切口，这会暂时减慢加工速度。
Deep multipass cutting of bidirectional and unidirectional carbon fiber reinforced plastics (CFRP) with picosecond laser pulses was investigated in different static atmospheres as well as with the assistance of an oxygen or nitrogen gas flow. The ablation rate was determined as a function of the kerf depth and the resulting heat affected zone was measured. An assisting oxygen gas flow is found to significantly increase the cutting productivity, but only in deep kerfs where the diminished evaporative ablation due to the reduced laser fluence reaching the bottom of the kerf does not dominate the contribution of reactive etching anymore. Oxygen-supported cutting was shown to also solve the problem that occurs when cutting the CFRP parallel to the fiber orientation where a strong deformation and widening of the kerf, which temporarily slows down the process speed, is revealed to be typical for processing in standard air atmospheres.