Double-beam laser polishing device and polishing method for aluminum alloy

A double-beam laser polishing device for an aluminum alloy, comprising:

• a frame;
• and
• a rotary workbench and an optical path system, which are arranged on the frame;
• wherein
• the rotary workbench is configured for supporting a workpiece;
• the optical path system comprises:
• a first fiber laser, a second fiber laser, a first three-dimensional galvanometer, and a second three-dimensional galvanometer;
• the first three-dimensional galvanometer is connected with the first fiber laser through an optical fiber, and the second three-dimensional galvanometer is connected with the second fiber laser through an optical fiber;
• the first three-dimensional galvanometer and the second three-dimensional galvanometer are arranged side by side above the rotary workbench in a horizontal direction;
• the first fiber laser and the second fiber laser are configured to emit laser beams with different powers and have different laser scanning paths, so as to achieve peak melting and valley filling and reduce a secondary roughness generated during polishing by the first fiber laser;
• and
• a scanning path of the first three-dimensional galvanometer is a zigzag path, and a scanning path of the second three-dimensional galvanometer is a Z-shaped path, a square wave path, or a spiral wave path;
• or alternatively, the scanning path of the first three-dimensional galvanometer is a Z-shaped path, and the scanning path of the second three-dimensional galvanometer is a zigzag path, a square wave path, or a spiral wave path.