Fine trimming device for small-modulus gear based on 3D printing

The invention discloses a small module gear fine trimming device based on 3D printing, comprising: a polishing mechanism comprising a polishing driving member, a polishing gear and a main frame body; the main driving mechanism drives the main frame body to slide in the front-back direction; the driven gear is detachably and rotatably connected to the auxiliary frame body, and the polishing gear is meshed with the driven gear; the auxiliary driving mechanism drives the auxiliary frame body to slide; the displacement amplification mechanism comprises a piezoelectric sensor and a centralized control module, the piezoelectric sensor abuts against the main frame body, the piezoelectric sensor converts a force signal into an electric signal, and the centralized control module is electrically connected with the piezoelectric sensor, the main driving mechanism and the auxiliary driving mechanism. The centralized control module controls the magnitude of input current of the main driving mechanism according to the magn