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Laser cutting nozzle design

by:J&D WATER     2020-03-26
Laser cutting nozzle design nozzle design and flow control technology, 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 quality of the beam 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. Laser cutting nozzle adopt simple structure, namely a taper hole end little round hole ( As shown in figure 4) 。 Usually by experiment and error method to carry on the design. Because the nozzle is generally made of red copper, smaller volume, 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. Research 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/mind - gas velocity MmPg - nozzle diameter Nozzle pressure ( Gage pressure) The bar for different gas pressure threshold, when the nozzle pressure exceeds this value, the airflow is normal oblique shock wave, transition from subsonic to supersonic gas flow rate. 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 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. So the taper hole with small end round hole of the nozzle, the nozzle of the oxygen pressure is often under 3 bar. Sheet metal laser cutting equipment recommendation: preferential deals offer 4007001618 【 Metal laser cutting equipment 】 It is mainly used for cutting stainless steel, carbon steel, aluminum, copper, aluminum, iron, gold, silver etc. Thickness is 1. 0 ~ 25 mm plate; 【 Stainless steel laser cutting equipment 】 Classic gantry double drive structure of stable and reliable, automatic switching table, at the same time of cutting up and down on another table, convenient and quick to save time; 【 Optical fiber laser cutting 】 With high-speed movement speed, acceleration and dynamic performance, is laser for efficient and specialized research and development of a product, its cutting 0. The speed of 5 mm stainless steel reached 100 m/min. 【 Carbon steel sheet metal laser cutting 】 Specializing in sheet metal processing industry demand for sheet of processing in the field of research and development design of laser processing equipment, it has a very high cost performance, with CNC system control, efficiency is much higher than in other laser cutting equipment for the board drive mode control. More sheet metal laser cutting equipment, laser cutting cutting nozzle
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