In order to control the type of gas, the pressure of gas and the time of perforation, a more reliable gas path control system is needed for pulse perforation.In the case of pulse perforation, attention should be paid to the transition technique from pulse perforation when the workpiece is at rest to continuous Laser cutting machine manufacturers of the workpiece at constant speed in order to obtain a high quality cut.In theory, it is usually possible to change the cutting conditions of the acceleration section, such as the focal length, nozzle position, gas pressure, etc., but it is not possible to change the above conditions due to the short time in practice.It is more realistic to change the average laser power in industrial production. There are three specific methods as follows :(1) changing the pulse width;(2) change the pulse frequency;(3) simultaneously change the pulse width and frequency.The practical results show that the effect of (3) is good.
(1) perforation: material by continuous laser irradiation in the center of the formation of a pit, garment laser cutting machine manufacturers, and then by the laser beam coaxial oxygen flow will soon be removed from the molten material to form a hole.The size of the general hole is related to the thickness of the plate, the average diameter of the perforation is half of the thickness of the plate, so the thickness of the plate perforation aperture is larger, leather laser cutting machine manufacturers, and not round, should not be used in the higher requirements of the parts (such as oil screen seam pipe), can only be used for waste.In addition, due to the perforation of the same oxygen pressure and cutting, the splash is larger.
(2) pulse perforation: the pulse laser of peak power is used to melt or vaporize a small amount of materials, and air or nitrogen is commonly used as auxiliary gas to reduce the hole expansion due to exothermic oxidation, and the gas pressure is smaller than the oxygen pressure when cutting.Each pulse of laser light produces only a small jet of particles that are progressively deeper, so it takes a few seconds for the plate to perforate.Once the perforation is complete, the auxiliary gas is replaced with oxygen for cutting.In this way the perforation diameter is smaller and the perforation quality is better than the perforation.The laser used for this purpose should not only have a high output power;More important is the time and space characteristics of the beam, so the general cross flow CO2 laser can not adapt to the requirements of laser cutting.
5. Users should avoid talking over the lenses and keep food, drinks and other potential contaminants away from the working environment.
In the process of cleaning the lens, the method with relatively little risk should be adopted.The following steps are designed for this purpose and should be used by the user.First of all, blow off the floating objects on the surface of the original with balloons, especially the surface of the lens with tiny particles and flocculation, Maanshan laser cutting machine manufacturers, this step is necessary.But do not use the compressed air from the production line, because the air will contain oil mist and water droplets, which will deepen the contamination of the lens.
The second step is a slight cleaning of the lens with an analytical pure.This grade is nearly waterless, which reduces the possibility of lens contamination.
Cotton ball dipped in the light must be cleaned lens, plate laser cutting machine manufacturers, and do ring movement.Once a cotton swab gets dirty, it must be replaced.Cleaning should be done all at once to avoid creasing.If a lens has two coated surfaces, such as a lens, each face needs to be cleaned in this way.One side should be protected by a clean sheet of lens paper.
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