Enclosed Type

Laser cutting machine fluid mechanics calculation and analysis

by：Transon 2020-10-28

Laser cutting machine laser cutting steel, oxygen and focused laser beam is through the nozzle to cut CaiLiaoChu, thus forming a beam. 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. 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. The laser cutting nozzle adopt simple structure, namely a small round hole taper hole with end. Usually by experiment and error method to carry on the design. Due to the laser cutting machine nozzle is generally made of copper, the volume is small, is quick-wear part, often need to change, so there is no fluid mechanics calculation and analysis. When use from nozzle side ventilation with certain pressure Pn ( Gage pressure rated Pg) Gas, according to the nozzle pressure, from the outlet nozzle, after a certain distance to reach the surface of the workpiece, cutting pressure Pc, says the pressure, after the expansion of gases to the atmosphere pressure Pa. Laser cutting machine research work shows that with the increase of the Pn, airflow velocity increases, the Pc is also increasing. Can use the following formula: n = 8. 2d2( Pg + 1) V - L/min d - gas velocity The nozzle diameter mm

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