In laser cutting, industrial practitioners have historically demanded higher cutting speeds and better quality cuts. Thus, there has been significant interest in the elucidation of related processing phenomena. The cutting quality is commonly affected by the ejection behavior of the generated melt, which might be influenced by the profile of the laser cutting front. Therefore, it is desirable to directly observe the cutting front in real time; however, this cannot be easily achieved practically. In our previous work, we applied real-time observation using an X-ray transmission system to laser cutting fronts, thus enabling observation of the profile of the cutting front and the ejection behavior of the melt simultaneously. In this study, we quantitatively evaluate the cutting front profile observed fluoroscopically in real time using an X-ray transmission system and discuss the relationship between the profile and ejection behavior of the melt. In addition, we investigated the conditions for achieving a sound cut (dross-free cut). We directly confirmed that dross-free cutting occurs when the cutting front profile and ejection angle of the melt are approximately perpendicular to the surface of the test piece.

在激光切割中，工业从业者历来要求更高的切割速度和更好的切割质量。因此，对相关加工现象的阐明引起了极大的兴趣。切割质量通常受所产生熔体的喷射行为的影响，这可能会受到激光切割前沿轮廓的影响。因此，需要实时直接观察切割前沿；然而，这实际上并不容易实现。在我们之前的工作中，我们使用 X 射线传输系统对激光切割前沿进行实时观察，从而能够同时观察切割前沿的轮廓和熔体的喷射行为。在这项研究中，我们使用 X 射线传输系统实时定量评估了荧光透视观察到的切割前沿轮廓，并讨论了轮廓与熔体喷射行为之间的关系。此外，我们还研究了实现完美切割（无渣切割）的条件。我们直接证实，当切割前轮廓和熔体喷射角与试件表面近似垂直时，会发生无渣切割。