On-position Measurement Method for Position-error Compensation in Machining

Due to requirements of high-precision geometric tolerances for some high precision products, forming errors and clamping errors are unavoidable in the machining process. In this paper, an on-position measurement method is proposed for position error compensation based on the combination datum theory. Firstly, the mathematical representation model of the coaxiality of parts with the shallow holes is constructed based on the combination datum theory. Secondly, an on-position measurement method is proposed with constructing the mathematical model of the profiles of the surfaces based on laser displacement sensors (LDSs) to calculate the coaxiality error of parts on-position based on the combination datum theory. Based on it, the position of the spindle of the machine are adjusted to present the clutter again to compensate for position errors of the holes. Finally, the experimental results demonstrate the effectiveness and correctness of the proposed position error compensation method based on the on-position measurement device.