Clamping mechanism for fan hub machining

The clamping mechanism comprises a machine table, a mounting groove is formed in the machine table, a cross-shaped opening is formed in the top end of the mounting groove, supporting blocks used for supporting the fan hub are inserted into four openings of the cross-shaped opening, a mounting block is arranged in the center of the inner wall of the mounting groove, and a clamping groove is formed in the machine table. First lead screws are rotationally arranged on the four faces of the mounting block correspondingly, first screw sleeves are in threaded connection with the four first lead screws correspondingly, the top ends of the four first screw sleeves are connected with the bottom ends of the corresponding supporting blocks correspondingly, grooves are formed in the four corners of the machine table correspondingly, and mounting boxes are arranged in the four grooves correspondingly. Top clamping mechanisms used for clamping and fixing the fan hub are arranged in the four mounting boxes correspondingly. A