The nozzle for the low-light cutting of the automatic fiber laser cutting machine adopts a simple structure
Automatic fiber laser cutting machine. In addition, because the oxygen pressure used for perforation is the same as that during cutting, it is very soft. (2) Pulsed perforation: a pulsed laser with high peak power is used to melt or vaporize a small amount of material. Air or gas is commonly used. As a shaft-assisted air break, it reduces the hole expansion due to exothermic oxidation. The air pressure is lower than the oxygen pressure during cutting. Each pulse laser only produces small particle jets and gradually penetrates. Therefore, the perforation time of the thick plate takes a few seconds. Once the perforation is completed, immediately change the auxiliary gas to oxygen for cutting. In this way, the diameter of the perforation is smaller, and the perforation quality is better than that of the blasted perforation. For this reason, the laser used should not only have a higher output power: more importantly. Because of the time and space characteristics of the light beam, the general cross-flow C02 micro-optic device cannot meet the requirements of low-light cutting. In addition, pulse perforation also 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 pulse from the workpiece is stationary The technology of continuous cutting from piercing to workpiece at constant velocity should be taken seriously. In theory, the cutting conditions of the Gadi section can usually be changed: such as focal length, nozzle position, gas pressure, etc., but in fact, the above conditions are changed due to too short time. The possibility is unlikely.
In industrial production, the automatic fiber laser cutting machine mainly adopts the method of changing the average laser power, which is more realistic. There are three specific methods: (1) Change the pulse width: ( 2) Change the pulse must be firm: (3) Change the pulse width and frequency at the same time. The results of Shile show that the (3) effect is better. Nozzle design and air flow control Nozzle design and air flow control technology: when cutting steel with low light , The oxygen and the focused laser beam are shot to the material to be cut through Xiaoma, thereby forming an airflow beam. The basic requirement for airflow is that the amount of air foam entering the incision should be large, and the reach should be high, so that the material can be formed. An air stream. The basic requirements for the air flow are that the air flow entering 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 out the engraved material. In addition to the quality of the beam and its control directly affecting the cutting quality, the design of the spray and the control of the airflow (such as the nozzle pressure, the position of the workpiece in the airflow, etc.) are also very important because of the leather, the nozzle for low-light cutting It adopts a simple structure, a tapered hole with an emerald ring hole (as shown in Figure 4). It is usually designed by experiment and error methods. Because the nozzle is generally made of copper, it is small in size and is a vulnerable part that needs to be replaced frequently. Therefore, calculation and analysis of fluid mechanics are not performed. When in use, a gas with a certain pressure Pn (Pg in the surface of the nozzle) is introduced from the nozzle surface, and the nozzle pressure is called. The cutting machine is a cutting system using ultraviolet laser. Utilizing the characteristics of ultraviolet light, it has higher precision and better cutting effect than the traditional long liquid long cutting machine.
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