Optical fiber laser cutting machine nozzle design and flow control technology

Therefore, in addition to the beam quality and its control directly affect the quality of cutting, the design of the nozzle and air flow control ( Such as nozzle pressure, workpiece position in the air, etc. ) Is also very important factors. When the nozzle pressure higher Pn/Pa = ( 1 + 1 / n) (1 + n / 2 Pn； 4bar） Normal oblique shock wave, air sealing into normal shock, cutting pressure Pc drop, air velocity to reduce, and the workpiece surface vortex, weaken the effect of air flow to remove molten material, cutting speed. Fiber laser cutting machine nozzle design and flow control technique for fiber laser cutting machine nozzle is generally made of red copper, smaller volume, is quick-wear part, need to change often, so there is no fluid mechanics calculation and analysis. The threshold value freedom with Pn, Pa ratio and gas molecules ( n) Two factors: such as oxygen, air n = 5, so the threshold Pn = 1 bar x ( 1. 2) 3. 5 = 1. 89bar。
。 When use from nozzle side ventilation with certain pressure Pn ( Gage pressure rated Pg) Gas, according to the nozzle pressure, from the outlet nozzle, reach the surface of the workpiece by a certain interval, its pressure said cutting pressure Pc, after the expansion of gases to the atmosphere pressure Pa. Research shows that with the increase of the Pn, airflow velocity increases, the Pc is also increasing.
the cutting principle of optical fiber laser cutting machine is no need to do, laser cutting machine believe everyone knows that optical fiber laser cutting machine in cutting steel, oxygen and focused laser beam is through the nozzle to cut CaiLiaoChu, thus forming a beam. Laser cutting machine used by the nozzle structure is relatively simple, namely a tapered hole with small end hole, usually with experiments and error method to carry on the design. So the taper hole with small end round hole of the nozzle, the nozzle of the oxygen pressure is often under 3 bar. Can use the following formula: n = 8. 2d2( Pg + 1) V - L/min d - gas velocity Pg - mm nozzle diameter Nozzle pressure ( Gage pressure) Bar fiber laser cutting machine for different gas pressure threshold, laser cutting machine when the nozzle pressure exceeds this value, the airflow is normal oblique shock wave, the transition from subsonic to supersonic gas flow velocity. Of the airflow into the incision are basic requirements of the gas flow, higher speed, so that make incisions enough oxidation material adequately exothermic reaction; With enough momentum to molten material injection blow out.








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