The use of laser cutting machine, a good cutting effect can not be separated from a variety of gas auxiliary, in addition to the purity of auxiliary gas requirements, cutting process for high pressure requirements are also.

In the high power laser cutting process, the auxiliary gas must have sufficient pressure to be able to completely clear the waste residue produced by cutting, usually in the cutting of a thick workpiece when the pressure to reduce a little, stick to the residue on the workpiece will damage the cutting edge.

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Increasing the gas pressure can advance the cutting speed, but after reaching a maximum, continue to increase the gas pressure but will cause the cutting speed to decline. In the case of high auxiliary gas pressure, the reason for the decrease of the cutting speed can be attributed to the enhancement of the cooling effect of the high airflow velocity and the action zone. It may also be the interference of the intermittent shock wave in the airflow to the cooling of the green laser pointers action zone. There is a non-uniform pressure and temperature in the airflow that can cause changes in the airflow field density. Such a density gradient results in a change in the field refractive index, which causes the focus of the beam to focus, resulting in refocusing or beam divergence. This interference can affect the melting efficiency, and sometimes may change the mode structure, resulting in cutting quality degradation, if the beam divergence too much. So that the spot is too large, and even can not be effectively cut the serious consequences.

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In the laser cutting process, the laser emitted by the laser is collimated by the cutting head and the focusing lens converges to a point (focus). The operator must ensure that the processed laser beam is at the center of the nozzle and adjust the distance of the nozzle from the surface of the plate Plate thickness), the nozzle at the high-pressure gas jet, with the laser beam to complete the cutting operation.

Cutting the edge of more or less cutting left the lines, the depth of the groove determines the roughness of the cutting surface. The lighter the lines, the lower the roughness, the smoother the surface. In general, the thinner the material thickness, the lower the surface roughness of the cut; the lower the surface roughness than nitrogen cutting with nitrogen or argon. Since the blue laser pointer beam is focused by the presence of the beam and there is a divergence characteristic of the beam, which results in inconsistent spot sizes at different depths in the thickness direction of the material at the time of cutting (especially at the time of cutting of the slab), resulting in a failure of the cutting surface to the surface of the sheet Absolute 90 °, or the upper surface is wider or the lower surface is wider. In general, the thinner the material thickness, the better the vertical; the better the beam quality, the better the verticality. In addition, the relative position of the spot focus and the thickness direction of the material is related to the specific processing.

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According to the principle of laser cutting and planning, the following reasons are obtained: the main reason for the formation of burrs is: the focus of the laser focus is not correct, the demand is done by the focus of the position test, according to the focus of the offset to adjust; The laser output power is not the need to see the laser generator is not normal operation, if normal, then investigate the laser control button output value is not correct, to be adjusted; cut the line speed is too slow, the demand in the operation control Line speed; cut the purity of the gas can not, the demand for the supply of high-quality incision operating gas; red laser pointer focus offset, the need to do the focus of the test, according to the focus of the offset to adjust; machine running time is too long showing instability , At the moment demand shutdown from scratch.