How to cut perforations with High-Power 355 nm Ultraviolet Laser
Aug 18 , 2021One of the cutting processes of laser cutting machines is cutting perforation technology, and there are currently two processing methods for this technology: blast perforation and pulse perforation. Different cutting and piercing methods produce different results. Therefore, before operating the cutting machine for piercing, you must fully understand these two piercing techniques. So the following editor will give you a detailed introduction to these two perforation techniques.
Laser cutting perforation technology: Any kind of thermal cutting technology, except for a few cases, which can start from the edge of the board, generally a small hole must be pierced in the board. Earlier on the laser punching compound machine, a punch was used to punch out a hole, and then a laser was used to start cutting from the small hole. There are two basic methods of perforating for laser cutting machines without punching devices:
After the material is irradiated by the continuous laser, a pit is formed in the center, and then the molten material is quickly removed by the oxygen flow coaxial with the laser beam to form a hole. Generally, the size of the hole is related to the plate thickness. The average diameter of the blasting hole is half of the plate thickness. Therefore, the blasting hole diameter of the thicker plate is larger and not round. It is not suitable for use on the parts with higher requirements (such as oil screen pipe ), can only be used on scrap. In addition, since the oxygen pressure used for perforation is the same as that used for cutting, the splash is larger.
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A pulsed laser with high peak power is used to melt or vaporize a small amount of material. Air or nitrogen is often used as an auxiliary gas to reduce the expansion of the hole due to exothermic oxidation. The gas pressure is lower than the oxygen pressure during cutting. Each pulse laser only produces small particle jets, which gradually penetrate deeper, so it takes a few seconds for the thick plate to perforate. Once the laser cutting machine's perforation is completed, the auxiliary gas is immediately changed to oxygen for cutting. In this way, the diameter of the perforation is smaller, and the perforation quality is better than that of blasting perforation. For this reason, the laser used should not only have a higher output power; the more important time and space characteristics of the beam, so the general cross-flow CO2 laser cannot meet the requirements of laser cutting.
As the editor mentioned above, the laser cutting machine uses different cutting and perforation methods, and the quality and effect of the cutting process are also different. Therefore, before you manipulate the equipment for processing, you must combine customer needs and actual use. Choose a more suitable cutting and perforation technology according to the situation, so that its cutting quality will be better.
