How does the laser cutting machine cut perforations?
One of the cutting processes of the laser cutting machine 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 effects. 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 drilled in the board. Earlier on the laser stamping 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:
(1) The blasting perforated material forms a pit in the center after continuous laser irradiation, and then a pit is formed in the center by the coaxial laser beam. The flow of oxygen quickly removes the molten material to form a hole. Generally, the size of the hole is related to the plate thickness. The average diameter of the blasting perforation is half of the plate thickness. Therefore, the blasting perforation hole of the thicker plate is larger and not round, and it is not suitable for use on parts with higher requirements (such as oil screen pipes). ), 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.
(2) Pulse perforation uses high-peak power pulsed laser to melt or vaporize a small amount of material. Air or nitrogen is often used as auxiliary gas to reduce the expansion of the hole due to exothermic oxidation. The gas pressure is lower than during cutting. The oxygen pressure is low. 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 perforation of the laser cutting machine 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; more importantly, the time and space characteristics of the time 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, so before you control the equipment for processing, you must combine Customers' needs and actual use conditions choose a more suitable cutting and perforation technology, so that the cutting quality will be better.
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