Design of the Ageneric Kinematics Model of Five-axis Machine Tools
This paper presents a generic five-axis model for various five-axis machine tools.It establishes a universal 5-axis machine tool mechanism model using mechanism theory and based on the analysis of three typical five-axis machine structures which has four rotational degrees of freedom(DOF),two rotational DOF on the fixture table and two rotational DOF on the spindle respectively.The generalized kinematics model of five-axis machines is constructed by combining the analytical equations for NC data are determined through homogeneous coordinate transformation matrix together with forward and inverse kinematics.The derived five-axis NC code expression is a general expression for all kinds of five-axis machine tools with three linear axes and two rotational axes.Moreover,the NC data for a specific machine tool can be transformed to the other machine tool configuration using the derived analytical equations.The implement of this model not only makes NC system having the ability to change the space coordinate,but also makes a spatial kinematics foundation for the development of high CNC system processing of five-axis functions.