Center drilling device for valve ball machining and capable of preventing hole position deviation and positioning method of center drilling device

The invention discloses a center drilling device for valve ball machining and capable of preventing hole position deviation and a positioning method of the center drilling device. The center drilling device is arranged on a moving seat, and a supporting frame is fixedly mounted on the right side of the upper surface of the moving seat. The center drilling device comprises a driving rack, a mounting lantern ring, a servo motor and a workbench, wherein the driving rack is attached and fixed to the left side of the exterior of the supporting frame; the mounting lantern ring is fixedly mounted outside a sliding frame; the servo motor is fixedly mounted in the middle of the upper end of the mounting plate; and the workbench is fixedly arranged on the upper surface of the moving seat. According to the center drilling device for valve ball machining and capable of preventing hole position deviation and the positioning method of the center drilling device, novel structural design is adopted, the device can clamp and