Lapping and polishing machine and polishing process thereof

The invention provides a lapping and polishing machine and a polishing process thereof. The lapping and polishing machine comprises a bottom box and a connecting bracket, wherein a clamping assembly used for clamping a machined part is assembled on the upper surface of the bottom box; a controller is mounted on the front side of the bottom box; a support is welded to one side of the bottom box; the connecting bracket is movably assembled to one side of the support; and a second cylinder is mounted on the surface of the support. The lapping and polishing machine is technically characterized inthat the clamping assembly is designed above the bottom box; sliding blocks II and an elastic part I are arranged inside a rotary disk; the clamping assembly can implement clamping and fixing on machined parts with different hole diameters, and the position stability of the machined parts is ensured; meanwhile, the machined parts can be flexibly disassembled and assembled, and the use flexibilityof whole equipment is improved; a transition wheel set and a tensioning assembly are designed on the surface of the connecting bracket and can drive abrasive disks to rotate at constant speed in a belt driving mode through combination with a driving wheel set; and meanwhile, the tensioning assembly at the place can automatically make the transition wheel set abut against the surface of a belt, sothat the lapping and polishing machine ensures that the belt maintains a tensioned state all the time, and smooth driving operation is guaranteed.