Fiber laser negative pressure cutting method for metal materials thicker than 8mm

Abstract

The invention relates to a method for fiber laser negative pressure cutting of metal materials with a thickness of more than 8mm, which is carried out according to the following steps: (1), the laser beam is converged to the upper surface of the metal material through the optical system in the cutting head, so that the metal material absorbs the laser and melts; ( 2), the cutting head provides auxiliary gas to blow off the molten metal material; (3), the moving cutting head cuts the metal material; it is characterized in that: (4), while the moving cutting head cuts the metal material, the lower surface of the metal material is uninterrupted A negative pressure less than atmospheric pressure is applied until the entire cutting process; thus realizing the cutting of metal materials with a thickness of more than 8mm. The fiber laser negative pressure cutting method for thick metal materials of the present invention can reduce the auxiliary gas pressure of the cutting head while maintaining the efficiency of the auxiliary gas blowing off the melt in the cutting gap during the cutting process of thick metal materials, and then when the laser is close to the laser When the cutting capacity is at the limit, the scrap rate is reduced while maintaining the processing quality and stability, and the upper limit of the laser's processing capacity is increased.

Description

technical field [0001] The invention relates to a method for fiber laser negative pressure cutting thick metal materials, in particular to a method for fiber laser negative pressure cutting metal materials thicker than 8mm. Background technique [0002] At present, the traditional fiber laser cutting of metal materials mainly adopts: the laser beam is converged to the surface of the material through the optical system of the cutting head to make it absorb the laser and melt, the cutting head provides auxiliary gas to blow off the molten material, and the cutting head is moved to achieve cutting. In this way Next, in order to ensure the cutting quality, the thicker the processed material, the auxiliary gas pressure must be reduced simultaneously, but the pressure reduction will make the melt not enough to blow away from the cutting gap, causing the cutting to fail, and the cutting speed is extremely slow, which cannot be solved. Therefore, the traditional method of fiber lase...

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