A Study on estimation of three-dimensional tolerances based on simulation of virtual machining in turning processes including kinematic motion deviations

摘要

The geometric dimensioning and tolerancing is one of the most important characteristics of machined parts. A systematic method is proposed in the paper to simulate the shape generation processes in turning operations, to estimate the geometric dimensioning and tolerancing of the turned faces, based on the machining parameters. The simulation model includes both the models of the shape generation motions considering kinematic motion deviations and the cutting tool geometries. The shape generation motions with deviations are mathematically described by combining 4 by 4 transformation matrices. A set of points on the turned faces are generated through the simulations, and an assessment surface is obtained as the datum reference to estimate the 3-dimensional (3D) tolerances, based on the points generated by the turning process simulations. The proposed method provides us with a systematic method to estimate the geometric dimensioning and tolerancing in the turning processes including the kinematic motion deviations.