Cutting perforation technology of automatic fiber laser cutting machine manufacturers

Fully automatic fiber laser cutting machine manufacturer cutting, cutting and perforation technology: Any kind of thermal cutting technology, except for a few cases, can start from the edge of the board, the material is irradiated by continuous laser to form a pulse perforation in the center: using high peak power The pulsed laser melts or vaporizes a small amount of materials. Air or glutinous gas 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 to perforate thick plates. Once the perforation is completed, immediately change the auxiliary gas to oxygen for cutting. In this way, the perforation diameter is smaller, and the perforation quality is better than blast 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. In addition, pulse perforation requires a more reliable gas path control system to realize the switching of gas types, gas pressure and perforation time control. In the case of pulse perforation, in order to obtain high-quality cuts, the transition technology from pulse perforation when the workpiece is stationary to continuous cutting of the workpiece at constant velocity should be paid attention to.

Theoretically speaking, manufacturers of automatic fiber laser cutting machine can usually change the cutting conditions of the acceleration section: such as focal length, nozzle position, gas pressure, etc., but in fact, the possibility of changing the above conditions due to too short time Not big. In industrial production, the main method of changing the average power of the laser is more realistic. There are three specific methods: (1) changing the pulse degree; (2) changing the pulse frequency; (3) changing the pulse width and rate at the same time. Nozzle design and airflow control area Nozzle design and airflow control technology: When laser cutting steel, oxygen and focused laser beam are shot through the nozzle to the material to be cut, thus forming an airflow beam. The basic requirement for air flow is that the air flow into the incision should be large and the speed should be high, so that enough oxidation can make the incision material fully carry out the exothermic reaction; at the same time, there is enough momentum to spray the molten material out. Therefore, in addition to the quality of the beam and its control directly affecting the cutting quality, the design of the nozzle and the control of the airflow (such as nozzle pressure, the position of the workpiece in the airflow, etc.) are also very important factors.