Laser device for additive manufacturing and operation method thereof
A laser device for additive manufacturing and an operation method thereof are provided. The laser device has a laser generation unit, a spectroscopic unit, a control unit, and a lens assembly unit. A laser beam is split into two or more beams by disposing the spectroscopic unit and the lens assembly unit. Thus, a roughness of a process surface and a process time can be reduced.
1. A laser device for additive manufacturing, comprising:
a laser generation unit configured to emit a laser beam;
a spectroscope unit configured to receive the laser beam and split the laser beam into separate beams, wherein the spectroscope unit comprises a spot modulation lens assembly, a laser spectroscope, and a rotary component, wherein the spot modulation lens assembly is disposed at a light downstream side of the laser generation unit and configured to receive the laser beam and modulate a size of a spot of the laser beam, the laser spectroscope is disposed at a light downstream side of the spot modulation lens assembly and configured to receive the laser beam modulated by the spot modulation lens assembly and split the laser beam into the separate beams, the laser spectroscope is disposed in the rotary component, and the rotary component is configured to move or rotate the laser spectroscope along an optical axis direction of the laser beam modulated by the spot modulation lens assembly;
a control unit electrically connected to the spectroscope unit; and
a lens assembly unit configured to receive the separate beams and reflect the separate beams to a working platform;
wherein the rotary component includes a shell, a stator, and a plurality of air inlets, wherein the stator is disposed inside the shell, the air inlets are formed in the shell, and the laser spectroscope is located inside the rotary component and configured to be a rotor.
2. The laser device according to claim 1 , wherein the spectroscope unit further comprises a space adjustment lens assembly, and the space adjustment lens assembly is disposed at a light downstream side of the laser spectroscope and configured to receive the separate beams split by the laser spectroscope and adjust a degree of divergence of the separate beams.
3. The laser device according to claim 1 , wherein the lens assembly unit comprises a scanning galvanometer, and the scanning galvanometer is disposed at a light downstream side of the space adjustment lens assembly and configured to receive the separate beams adjusted by the space adjustment lens assembly, so that the separate beams are reflected to the working platform along a direction after being reflected from the scanning galvanometer.
4. The laser device according to claim 3 , wherein the lens assembly unit further comprises a focusing lens assembly, and the focusing lens assembly is disposed at a light output side of the scanning galvanometer and configured to focus the separate beams reflected by the scanning galvanometer on a plane.
5. The laser device according to claim 1 , wherein the laser device is disposed in an optical system of a powder bed melt molding device.
6. An operation method of a laser device for additive manufacturing according to claim 1 , comprising:
a preparation step of generating a laser beam using a laser generation unit;
a splitting step of splitting the laser beam into separate beams using a spectroscope unit; and
a reflecting step of reflecting the separate beams to a working platform using a lens assembly unit.
7. The operation method according to claim 6 , wherein in the splitting step, a laser spectroscope of the spectroscope unit is driven to move or rotate along an optical axis direction of the laser beam.