A laser cutting head with variable spot track shape and its cutting process

Abstract

The invention relates to a laser cutting head with a variable shape of a light spot track and a cutting process, belonging to the field of laser cutting processing. Its technical solution is a laser cutting head with a variable spot track shape, including a beam shaper, a track control component and a focusing component arranged in sequence along the direction of the optical path. The track control component includes a reflector, an X-axis vibrating mirror and a Y-axis vibrating mirror. Mirror, the rotation axis of the X-axis galvanometer is the vertical axis, the rotation axis of the Y-axis galvanometer is the horizontal axis, the reflection surface of the mirror is opposite to the reflection surface of the X-axis galvanometer, and the reflection surface of the Y-axis galvanometer is opposite to the X-axis The reflective surfaces of the galvanometers face each other. The beneficial effect of the present invention is that, by controlling the swing of the X-axis vibrating mirror and the Y-axis vibrating mirror, in the process of laser cutting by moving the main body of the laser head, the light spot is controlled to do circular reciprocating movement in the horizontal plane, so that the existing power laser can Achieve higher power cutting effect and speed, reduce production purchase cost.

Description

technical field [0001] The invention relates to the field of laser cutting processing, in particular to a laser cutting head with a variable shape of a spot track and a cutting process. Background technique [0002] Laser cutting uses a focused high-power-density laser beam to irradiate the metal sheet to rapidly melt, gasify, ablate or reach the ignition point, and at the same time blow off the molten material with the help of a high-speed airflow coaxial with the beam, thereby realizing the metal sheet. cutting. Compared with plasma cutting, flame cutting, wire cutting and other methods, laser cutting has the advantages of small heat-affected zone, fast cutting speed and good cutting quality, and has been widely used in sheet metal cutting. Moreover, laser cutting has higher requirements on the cutting precision of the beam, such as 0.1mm, and laser cutting needs to consider issues such as slits and timely discharge of molten metal, otherwise problems such as blast holes ...

AI Technical Summary

Problems solved by technology

If a focusing lens with a longer focal length is used to increase the focused spot to obtain a wider slit, it will cause the laser energy density near the focus to decrease, reduce the cutting efficiency, and also cause the laser divergence angle to decrease, resulting in slits on both sides of the focus The difference between the spot size at the thickness of the sheet and the spot size at the focal point is small, which cannot meet the requirements of wider slits at all thicknesses

The optical path structure of the current laser cutting head is as follows: figure 1 As shown, the beam emitted by the laser source passes through collimating mirrors, focusing mirrors and other structures, and the spot can only move up and down basically, and cannot change the direction in the plane.

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