State space model based dimensional errors analysis for rigid part in multistation manufacturing processes

Modeling of variation propagation in multistation machining process is one of the most important research fields. In this paper, a mathematic model to depict the part dimensional variation of the complex multistation manufacturing process is formulated. A linear state space dimensional propagation equation is established through kinematics analysis of the relationships among of locating parameter variation, locating datum variation, so the dimensional error accumulation and transformation within the multistation process are quantitatively described. A systematic procedure to build the model is presented, which enhances the way to determine the variation sources in complex machining systems. Finally, an industrial case of multistation machining part in one manufacturing shop is given to testify the validation and practicability of the method. The analytical model is essential to quality control and improvement for multistation systems in machining quality forecasting and design optimization.