Laser Cutting Machine TS1290 Engraving Machine CO2 laser for Acrylic Wood Plywood
Enclosed Type
Laser cutting machine nozzle design and flow control
by：Transon
2020-10-29
Laser cutting machine for the boundary of the oblique shock wave in air multiple reflections, the cutting pressure is cyclical change.
For the structure of manufacture can be used as shown in figure 4.
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.
Other region because the cutting pressure curve away from the nozzle exit too far, and focused beam is difficult to match and cannot be used.
The results as shown in figure 5: respectively NO2, no. 4, NO5 nozzle under different oxygen pressure, surface coarse degree Rz as a function of cutting speed Vc.
the nozzle nozzle design and airflow control design and flow control technology, laser cutting steel, oxygen and focused laser beam is through the nozzle to cut CaiLiaoChu, thus forming a beam. Laser cutting technology has two kinds: one kind is pulsed laser used for metal material. 。 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。 Because the 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. University of Hanover, Germany use 500 wco2 laser, laser central lens focal length 2. 5 ', the use of small hole nozzle and laval nozzle respectively made a test, as shown in figure 4. Laser cutting nozzle adopt simple structure, namely a taper hole end little round hole ( As shown in figure 4) 。 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. As can be seen from the figure of NO2 holes nozzle on the Pn 400 kpa ( Or 4 bar) When the cutting speed can reach 2. 75 /分钟( Carbon steel plate thickness of 2 mm) 。 So the taper hole with small end round hole of the nozzle, the nozzle of the oxygen pressure is often under 3 bar.
the tallest cutting pressure area close to the nozzle exit, the surface to the interval of nozzle exit is about 0. 5 ~ 1. 5 mm, cutting pressure Pc big and not random, is commonly used in cutting lever industry produce of the process parameters. 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. In order to produce content industry quality and production efficiency is higher and higher demands, must face up to solve all kinds of engineering technology and execute quality scale, in order to make this new technology more widely applied in our country. No. 4, NO5 two laval nozzle on the Pn is 500 kpa to 600 kpa when cutting speed can be up to 3. 5 m/min, and 5. 5米/分钟。
can use the following formula: n = 8. 2d2( Pg + 1)
V - Gas velocity L/min
d - The nozzle diameter mm
Pg - laser cutting machine Nozzle pressure ( Gage pressure) Bar
for different gas pressure threshold, when the nozzle pressure exceeds this value, the airflow is normal oblique shock wave, the transition from subsonic to supersonic gas flow velocity. The second high cutting pressure area about 3 ~ 3 of the nozzle exit. 5 mm, the cutting pressure Pc is bigger also, also can obtain good effect, and is conducive to protect the lens, the progress in its service life. Should be pointed out that cutting pressure Pc still is a function of the workpiece and the nozzle interval.
laser cutting machine for further progress of laser cutting speed, can according to the principle of aerodynamics, under the condition of the progress of the nozzle pressure does not produce shock wave is designed and manufactured a convergent-divergent nozzle, namely laval ( Laval） Nozzle. Laser cutting, laser cutting technology is widely used in metal and non-metallic materials processing, can greatly reduce the processing time, reduce machining capital, progress workpiece quality. The second is continuous laser used for non-metal material, the latter is an important application field of laser cutting technology. Usually by experiment and error method to carry on the design. Research shows that with the increase of the Pn, airflow velocity increases, the Pc is also increasing. Modern laser has become the 'very sharp' of people imagined a 'sword'.
the place on put together is narrated, the CO2 laser cutting machine technology is more and more application in the industrial production in our country, the research and development abroad is higher cutting speed and a thick steel plate cutting technology and equipment. 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 nozzle nozzle design and airflow control design and flow control technology, laser cutting steel, oxygen and focused laser beam is through the nozzle to cut CaiLiaoChu, thus forming a beam. Laser cutting technology has two kinds: one kind is pulsed laser used for metal material. 。 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。 Because the 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. University of Hanover, Germany use 500 wco2 laser, laser central lens focal length 2. 5 ', the use of small hole nozzle and laval nozzle respectively made a test, as shown in figure 4. Laser cutting nozzle adopt simple structure, namely a taper hole end little round hole ( As shown in figure 4) 。 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. As can be seen from the figure of NO2 holes nozzle on the Pn 400 kpa ( Or 4 bar) When the cutting speed can reach 2. 75 /分钟( Carbon steel plate thickness of 2 mm) 。 So the taper hole with small end round hole of the nozzle, the nozzle of the oxygen pressure is often under 3 bar.
the tallest cutting pressure area close to the nozzle exit, the surface to the interval of nozzle exit is about 0. 5 ~ 1. 5 mm, cutting pressure Pc big and not random, is commonly used in cutting lever industry produce of the process parameters. 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. In order to produce content industry quality and production efficiency is higher and higher demands, must face up to solve all kinds of engineering technology and execute quality scale, in order to make this new technology more widely applied in our country. No. 4, NO5 two laval nozzle on the Pn is 500 kpa to 600 kpa when cutting speed can be up to 3. 5 m/min, and 5. 5米/分钟。
can use the following formula: n = 8. 2d2( Pg + 1)
V - Gas velocity L/min
d - The nozzle diameter mm
Pg - laser cutting machine Nozzle pressure ( Gage pressure) Bar
for different gas pressure threshold, when the nozzle pressure exceeds this value, the airflow is normal oblique shock wave, the transition from subsonic to supersonic gas flow velocity. The second high cutting pressure area about 3 ~ 3 of the nozzle exit. 5 mm, the cutting pressure Pc is bigger also, also can obtain good effect, and is conducive to protect the lens, the progress in its service life. Should be pointed out that cutting pressure Pc still is a function of the workpiece and the nozzle interval.
laser cutting machine for further progress of laser cutting speed, can according to the principle of aerodynamics, under the condition of the progress of the nozzle pressure does not produce shock wave is designed and manufactured a convergent-divergent nozzle, namely laval ( Laval） Nozzle. Laser cutting, laser cutting technology is widely used in metal and non-metallic materials processing, can greatly reduce the processing time, reduce machining capital, progress workpiece quality. The second is continuous laser used for non-metal material, the latter is an important application field of laser cutting technology. Usually by experiment and error method to carry on the design. Research shows that with the increase of the Pn, airflow velocity increases, the Pc is also increasing. Modern laser has become the 'very sharp' of people imagined a 'sword'.
the place on put together is narrated, the CO2 laser cutting machine technology is more and more application in the industrial production in our country, the research and development abroad is higher cutting speed and a thick steel plate cutting technology and equipment. 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.
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