green laser pointer for its four functions

For different gases have different pressure threshold, when the nozzle pressure exceeds this value, the flow of normal oblique shock, subsonic to supersonic gas flow rate from the transition. This threshold value Pn, Pa ratio and the freedom of gas molecules (n) two factors: such as oxygen, air, n = 5, so the threshold value Pn = 1bar × (1.2) 3.5 = 1.89bar. When the nozzle pressure higher Pn / Pa = (1 +1 / n) 1 + n / 2 时 (Pn; 4bar), normal flow is oblique shock wave into the shock seal, cutting down pressure Pc, air flow rate reduction, and eddy currents in the workpiece surface, weakening the role of air to remove molten material affect the cutting speed. Therefore, the use of tapered bore with a small hole of the nozzle tip, the nozzle pressure of oxygen often 3bar below. The accessory of green laser pointer should also be maintained well.
To further improve the laser cutting speed, according to aerodynamic principles, the pressure in the premise of improving the nozzle does not produce normal shock, nozzle design and manufacture of a zoom, that Laval (Laval) nozzle. Figure 4 can be used to facilitate the manufacture of the structure. Laser Centre, University of Hannover, Germany using 500WCO2 laser, lens focal length 2.5 〃, the use of Laval nozzles and nozzle holes were tested, respectively, shown in Figure 4. The results shown in Figure 5: respectively, NO2, NO4, NO5 nozzle at different oxygen pressure, the cut surface roughness Rz and function of cutting speed Vc.
It should be noted that this control is not suitable for cutting acute fracture and cutting edge kerf angle. Closed form is not easy to cut big success. Control fracture cutting speed, does not require high power, otherwise it will cause surface melting, destruction kerf edge. The main control parameter is the laser power and spot size. Mainly used to cut into the desired shape of the workpiece sheet laser processing machine. (2) The use of laser beam energy to achieve cutting equipment. Respective disciplines: mechanical engineering (a subject); cutting processing technology and equipment (two subjects); special machine tools (3 subjects). Laser cutting is called the laser beam to the workpiece surface, the energy released to the workpiece to melt and evaporate in order to achieve the purpose of cutting and carving, with high precision, cutting speed, cutting patterns are not limited to, auto-layout to save materials, cut smooth, and low processing costs, will gradually improve or replace the traditional cutting process equipment. The customer should pay more attention to the general specification ofgreen laser pointer.

Laser as a new tool is currently applied to a variety of more mature industries, including laser cutting machine, laser engraving machine, laser marking machine, laser welding. So in the end is how the use of laser cutting, laser cutting, good or bad, how different? First, the led flash light energy in the form of light is concentrated into a high-density beam, the beam delivered to the work surface, producing enough heat to melt the material, combined with the coaxial beam melting of high-pressure gas directly across the metal removed to achieve the purpose of cutting This shows that the laser cutting machine tools machining with essentially different. The store has the specific stipulation for the payment method ofgreen laser pointer.