Abstract: The receptance coupling method for predicting tool point displacement receptance was studied to analytically predict tool point dynamical characteristics of end milling processing system. The processing system of end milling was divided into two subsystems with the parting line on the tool. The subsystem containing the main shaft is structurally complicated and hard to model analytically， so the displacement receptance was experimentally obtained， while that of the simplestructured tool subsystem was obtained using the finite element software. The two subsystems were beam units with different sections and connected by a single point. The nodes on the beam have translational and rotational DOFs. The displacement receptance of tool point was calculated based on displacement receptance of the two subsystems. Experiments were performed on 45# steel cylinders with different length， and the displacement receptance of the end point was obtained when the cylinders were assembled into holder.

Key words: receptance coupling, milling, end mill, tool point, displacement receptance