On-line monitoring device and method for ultra-precision grinding precision and surface quality of cylindrical roller

The invention discloses an on-line monitoring device and method for the ultra-precision grinding precision and surface quality of a cylindrical roller. The device comprises a cylindrical roller grinding system, a surface quality detection system, a dimension precision on-line measurement system, a temperature mechanical testing system, and a database system. The method comprises the steps: the grinding of the cylindrical roller, the detection of the surface quality of the cylindrical roller, the control of the rotating speed of a grinding wheel, the up-down and left-right movement of a supporting plate feeding mechanism, and the on-line detection of the dimension precision. The device and method can achieve the real-time control of the roller in a machining process, so as to guarantee the stability and consistency of machining quality.