When using fiber laser cutting machine,choose suitable gas and pressure
When using fiber laser cutting machine,choose suitable gas and pressure.
During the laser cutting,we need choose different cutting gas according to different materials.
The choice of cutting gas and pressure have great influence on laser cutting quality.
Combustion-supporting and heat dissipation, timely blow away the molten stains produced after cutting,
and prevent cutting molten stains upward rebound and get into nozzle,and protect focusing lens,etc.
a) The influence of cutting gas and pressure on cutting quality
1) The Cutting gas help to heat dissipation and combustion,
blew away the molten stains, to get good quality cutting face.
2) When the pressure of cutting gas is not enough,cutting quality will be affected as follows：
Generate molten stains when cutting, cutting speed can’t meet requirement,affect production efficiency.
3) When the cutting gas pressure is excessively high will affect the cutting quality：
Cutting surface is more rough, and kerf is wide; At the same time will cause partial melting of the cutting
surface, unable to form a good cutting surface.
b) The influence of cutting gas pressure on punch a hole
1)When gas pressure is excessive low,laser will difficult penetrate the cutting board,
and the time length to punch a hole will increase,lead to low production efficiency.
2) When the gas pressure is too high, cause melting of the laser punching,
form a larger melting point, thus affecting the quality of the cutting.
3) When laser drilling,Generally use the higher gas pressure to punch the thin plate,
and for thick plate punching, using the low gas pressure.
4) When laser cutting machine cutting ordinary carbon steel,
the thicker the material thickness, the cutting gas pressure relatively lower.
And when cutting stainless steel, although cutting gas pressure not change with the thickness of the material,
but the cutting gas pressure is always in a state of high pressure.
In a word, when select cutting gas and pressure,we must adjust according to actual condition when cutting,
should choose different cutting parameters according to the specific situation in specific application.
The Equipment in the factory before delivery we will reserve two gas pipeline, oxygen and air using one utility piping,
nitrogen use a high pressure pipe. Two gas road respectively connect with gas pressure reducing valves, as following figure:
Instruction of reducing valve:
The meter on the left shows the current air pressure, the right one shows the capacity of residual gas
“Attention” Nitrogen gas supply pressure should not exceed 20 kg
Oxygen supply pressure can not exceed 10 kg, otherwise easy to cause blowout of the pipe.
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