Calculation Of Feasibility Map Of Tool Orientation For Five-Axis Machining And Its Applications In Tool Orientation Optimization

Due to the high efficiency,high precision,variable tool axis direction and other advantages,the five-axis CNC machine tool has been more and more widely used in complex parts machining with high precision requirements.An important condition for five-axis machining is to ensure that the tool does not interfere with the workpiece,and the determination of the tool axis direction is largely limited by the feasible range of the tool axis.Therefore,it is important to solve the feasible region of the tool axis direction.Aiming at the complexity of the current feasible domain and the large computational time and time,this paper proposes an optimized algorithm for solving the feasible domain of the tool axis based on the constraints of the machining process and geometric properties on the feasible domain of the tool axis.The optimization process is completed by considering the machine tool's kinematic constraints or the tool wear condition.The algorithm for solving the feasibility map of the tool orientation mainly includes the following processes: Firstly,the constraint conditions of the feasibility map of the tool orientation are defined.Through the collision detection of each tool orientation by discretization,the feasibility map of tool orientation without interference can be solved.Secondly in order to reduce the calculated amount and improve the computational efficiency,a boundary of feasibility map updating algorithm for solving feasibility map combined with image processing technology of computer is proposed.Sexuality can be obtained by detecting the boundary of feasibility map of previous CC point and updating the feasibility map image,which can calculate the feasibility map of the adjacent CC point.On the basis of the calculated feasibility map of the tool orientation,the corresponding tool orientation can be further planned according to different targets in its feasibility map.In order to give full play to the kinematics of the machine tool,the Inverse Kinematics Transformation of machine tool can be performed.And then the tool orientation can be optimized based on directed graph.In order to improve the service life of the tool,the influence of the inclination angle of the tool on the tool use area from the geometrical level has been analyzed.And then the tool orientation can be optimized based on genetic algorithm.Finally,the simulation experiments of the proposed algorithm are carried out and the results of experiments are compared and analyzed.It is verified that the tool orientation optimization algorithm based on the research of this paper can effectively solve the interference problem.On this basis,the feasibility map can be applied to optimize the kinematics of machining and homogenize tool wear.