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  1. #1
    Join Date
    Jul 2018
    Posts
    27

    Post How to cutting the wood without blackening

    Using laser cutting machine for wood has the advantages of high precision, narrow slits, high speed, and smooth cutting surface, but, laser focusing energy that can melts the wood, so there will be blackening during the cutting process, that is cut edges are carbonized . Here, Perfect laser, laser application experts will tell us -
    how to reduce or avoid this situation?
    First, here need to clarify that if cutting a thick wood sheet, it`s difficult to avoid blackening. But after many times testing, we get that wood sheet`s thickness are less than 5mm can not get black, otherwise need to do more attention when cutting. So let`s talk about how to do can avoid blackening:
    Maybe all of us are known that to avoid the carbonization effect should use the machine with high-speed and low-power, it`s a way, but someone are misunderstood, they think the speed more faster more better, and the power should as low as possible, so in order to reduce blackening, they use high-speed and lower power with multi-cutting. That`s bad, the carbonization effect will be more and more.

    Use low power and fastness should be ensure that wood can be cut at one time, in this situation, more faster and lower power will be better. multiple cutting will make black because of finish cut part will get second burned, so the more repeated cutting, the more severe carbonization.
    First cutting being completely will be burned when second cutting, but the other part just cutting completely in second time, so but dark.
    Therefore, the first point to note is to ensure that to finish cutting in a time, do not secondary damage.
    And, the speed and power are contradictory, faster speed can not cut through, the smaller power can not cut through, we must prioritize between speed and power. According to my experience, speed is more important than low power. With higher power, try the fastest possible speed, under higher power, try the fastest speed, it can get the better data to reference. For example, test Nova35 laser cutting machine, 80W:
    Cut 3mm plywood, 55% power, speed is 45mm/s
    under this parameter, there is no blacken in.
    Cut 2mm plywood, 40% power, speed is 45mm/s
    Cut 5mm plywood, 65% power, speed is 20mm/s
    Plywood has begun to darken, but this situation is still good.
    Then i try the ultimate cutting speed, 18mm solid wood, maximum power, slowly speed. (if cut 18mm, 80W can not working, we recommend 130W and 150W)
    The result is cutting edge of wood has been carbonized, looks black. (for this situation, you can use sandblasting machine to clearing)
    Of course, lead to black, in addition to the impact of power speed, there still an important factor - blowing, cutting wood must be strong blowing, it is best to use high-power air compressors, because becoming black or yellow may caused by gas, so blowing can assist cutting to make cutting easier and prevent fire.
    This experience of laser cutting wood to avoid blackening is summarized here. This test data is not limited, just for reference. In theory, experimental data can be faster and the power can be lower, but can not guaranteed that will be cut through once. During actual application, many factors need to consider: working area is smooth or not, focal length issue caused by the unevenness of the wood, uneven plywood, etc., so we must be careful not to use limit values to cut, not easy to cut through.
    If there are situation that whatever doing still blackening, it may be a matter of material, such as the glue content of the plywood. So choose a suitable materials is also very important.

    Key points: In the case of a one-shot cut-through, fast speed and low power, and air compressor-assisted blowing.
    Attached Thumbnails Attached Thumbnails perfect-laser-metal-laser-cutter.jpg  

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