Technique for laser cutting metal tube utilizing compressed air and apparatus thereof

The present invention belongs to the field of laser cutting apparatus and the technological scheme is that the laser cutting apparatus consists of focus lens, cutting laser head, oxygen nozzle, nozzle regulating support and compressed air nozzle. One regulating support is installed for the cutting laser head to regulate the angle between the compressed air nozzle and the oxygen nozzle within 40-50 deg, the distance between the compressed air nozzle and the oxygen nozzle within 15-25 mm, the distance between the compressed air nozzle and the cut workpiece within 6-10 mm and pressure of compressed air in 1.5-2.5 times that of oxygen. The method and apparatus of the present invention can avoid overheat during cutting process. 将压缩空气用于激光切割金属管材的工艺方法及其装置，属于激光应用技术领域中涉及的一种工艺方法及其装置；本发明要解决的技术问题是提供一种将压缩空气用于激光切割金属管材的工艺方法及其激光切割头装置。解决技术问题的技术方案是通过聚焦透镜、激光切割头、氧气喷嘴、喷头调节支架、压缩空气喷头、压缩空气喷嘴构成的激光切割头装置实现的。在激光切割头安装一个调节支架，上面装有压缩空气喷头，可调节压缩空气喷嘴与氧气喷嘴之间的夹角在40°-50°范围内变化、压缩空气喷嘴到氧气喷嘴的距离为15-25mm范围内变化，压缩空气喷嘴到被切割的工件的距离在6-10mm范围内变化，压缩空气的气压是氧压的1.5～2.5倍，该方法及装置有效地解决了切割过程中的过热。