How to Achieve Burr Free Laser Cutting

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How to Achieve Burr Free Laser Cutting
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Picture this scenario You are offloading a sheet
of cut parts from the laser machine. From all
these pieces, you will pick up a few pieces to
reveal clean edges for the next step. And you
leave the rest of the pieces with the burred
finish.
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In order to avoid such burred finishes, you need
to know which parameters you exactly need to
work on. Here are some handful of strategies to
help you get the burr-free prints the way you
want. What Causes Burr? During the process of
laser cutting, the laser beams intense energy
brings the metal beyond its melting temperature,
and the powerful action of the assist gas leaves
the metal from the kerf. When you use nitrogen,
the cutting process relies on the beams energy
to melt the metal. When carbon steel is cut, the
oxygen interacts with the hot metal for an
exothermic reaction. And that adds extra
heat. This is why you dont need as much gas
pressure to eject the material. With oxygen
cutting, you have much lower pressure and slower
dynamic flow of the gas. Overall, these burrs
form from the molten metal solidifying faster
than its evacuation. The solid material becomes
a deposit at the bottom of the kerf. You can
also control the burr by using the right nozzles,
Mitsubishi spare parts, and Fanuc spare
parts. The Gas Dynamic When it comes to nitrogen
assist gas, operators need to make changes with
quality, efficiency, and costs in mind. It can
make up to 35 to 50 percent of the variable cost
in laser cutting. Hence, it is important to
control the overall consumption. When you set up
cutting parameters, it is important to
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minimize the nozzle diameter. It is also
essential to choose the smallest nozzle diameter
that you can use to achieve the anticipated
quality and performance. After determining the
smallest nozzle diameter, you need to determine
the lowest possible pressure to obtain a quality
cut with good molten metal separation with no
burrs. It is not the Speed A burr-free finish is
not something achievable with nozzle diameter
and gas pressure. You also have to pay attention
to the spare parts you are using. Make sure they
are either Mitsubishi spare parts or Fanuc spare
parts. Additionally, when you go too slowly, you
might end up injecting more heat than needed in
the kerf. And this might end up raising the
temperature to an extreme level. Eventually, it
causes vaporization which disturbs the gas
flow That disturbance, in turn, causes more
burrs, not less. This means that an operator can
make cut quality worse by slowing the feed
rate. You can prevent such events by increasing
the cutting speed incrementally.
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Consider Oxygen Cuts When it comes to oxygen
cutting for carbon steel, consider the
exothermic reaction. It is a fact that with both
CO2 and fiber lasers when you increase oxygen
global purity to 99.95 percent or above, you can
increase the cutting speed in production.
Sometimes between 30 to 40 percent. When an
oxygen vacuum flask or cylinder has a drop in
purity level, it is usually argon. It happens
because the oxygen gets produced cryogenically
in an air-separation unit, both oxygen and argon
liquefy at similar temperatures. When you add
argon into it, it changes the exothermic
reactions. It, in turn, affect the cutting
performance. The exothermic reaction works in
conjunction with the gas flow rate to burn and
evacuate the molten material. If the molten
material and oxidized slag arent removed
effectively, it remains as a burr on the cut
edge. At last pumping In most laser cutting
systems, installers know to avoid elbows in the
gas plumbing or to oversize the piping diameter
to compensate for pressure drops. With downtime
and gas not flowing to the laser, air penetrates
and fills the pipe. It can cause problems when
the laser is restarted for the next shift or
operation.
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Final Words! In order to achieve the burr-free
cut, the beam parameters and gas dynamics should
work together to ensure the right amount of
molten metal evacuates the kerf at the prime time.
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