The utility model provides a plain grinding frock of a plurality of bearing tile fragments of while plain grinding, it relates to a plain grinding frock. It is soft yielding that the technical difficulty that exists during bearing tile fragment plain grinding be the si taili alloy, and five axle piece thickness size drops requirements are minimum to lead to the grinding inefficiency. The utility model discloses well chassis level sets up, a N cam pin and a M cotter pilotage are all established on the chassis, central point A that a plurality of bearing tile fragments used the chassis for central equipartition on the chassis, be formed with a round hole between per two adjacent bearing tile fragments, every round hole corresponds the cooperation has a cotter pilotage, every cotter pilotage is established in its round hole that corresponds, the height of cotter pilotage is h, every bearing tile fragment height is H1, the high h of cotter pilotage is less than or equal to the high H1 of bearing tile fragment rather than contacting, every bearing tile fragment correspondence has a cam pin, every cam pin pastes tightly rather than the external circular arc surfaces who corresponds the bearing tile fragment mutually. The utility model is used for in the plain grinding work of a plurality of bearing tile fragments.