Cutting technology of laser cutting machine
Laser cutting machine cutting perforation Technology Description:
Any kind of thermal cutting technology, except for a few cases can start from the edge of the board, generally have to wear a small hole in the board. Previously in the laser punching machine is a punch with a punch out of a hole, laser cutting machine and then use the laser from the hole began to cut. There are two basic methods for punching a laser cutting machine without a punching device:
(1) Blast drilling (Blast drilling), the material after continuous laser irradiation in the center of the formation of a pit, and then by the coaxial with the laser beam oxygen flow quickly removed to form a hole. The size of the general hole and plate thickness, blasting perforation average diameter of half of the thickness of the board, so the thicker plate blasting perforation larger diameter, and not round, not on the use of higher parts (such as oil sieve ), laser cutting machine Can only be used for waste. In addition, the oxygen pressure used in the perforation is the same as that at the time of cutting, and the splash is large.
(2) pulse drilling: (Pulse drilling) using high-peak power pulse laser to make a small amount of material melting or vaporization, commonly used air or nitrogen as auxiliary gas to reduce the expansion due to exothermic oxidation of the hole, the gas pressure than cutting oxygen pressure small. Each pulsed laser produces only a small particle jet, which is gradually deepened, so the plate piercing time takes a few seconds. Once the perforation is completed, laser cutting machine the auxiliary gas is immediately replaced by oxygen for cutting. This perforation diameter is smaller, the perforation quality is better than blasting perforation. For this purpose, the laser used should not only have a higher output power; more important time and space characteristics of the time beam, so the general cross-flow CO2 laser can not meet the requirements of laser cutting. In addition, pulse perforation also need to have a more reliable air control system to achieve the gas type, gas pressure switching and perforation time control. In the case of pulsed perforation, laser cutting machine in order to obtain high-quality incision, from the workpiece when the pulse punch to the workpiece constant speed continuous cutting transition technology should be taken seriously. In theory, it is possible to change the cutting conditions of the accelerating section, such as focal length, nozzle position, gas pressure, etc., but it is not likely to change the above conditions because of the time being too short.
In industrial production mainly to change the average power of laser approach is more realistic, the specific methods are the following three:
(1) change the pulse width;
(2) change the pulse frequency;
(3) change the pulse width and frequency at the same time.
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