Method for cutter-axis vector fairing of complex curved surface five-axis numerical control machining based on kinematical constraints

Abstract

The invention relates to a method for cutter-axis vector fairing of complex curved surface five-axis numerical control machining based on kinematical constraints, which belongs to the field of precise and efficient processing of complex curved surface five-axis numerical control machining, and particularly relates to a method for cutter-axis vector fairing based on machine tool kinematical constraints in the process of complex curved surface five-axis numerical control machining. The method is characterized by establishing a machining tool swivel feeding shaft angle optimized mathematical model on the basis of determining a cutter-axis fairing adjustment interval on a processing track curve and determining a discrete point according to the cutter step length, carrying out optimization on the corresponding machining tool swivel feeding shaft angle of the discrete point, and determining a corresponding coordination calculation method of a cutter-axis vector; then calculating the rotation angle of the cutter-axis vector opposite to the curved surface normal vector corresponding to the discrete point; and finally, carrying out fitting on the acquired discrete processing track normal vector angle, thereby acquiring a cutter-axis vector function for fairing, and ensuring a rotation axis of a machine tool to be smooth in motion. The method provided by the invention realizes smooth motion of the rotation axis of a five-axis numerical control machine tool, is wide in application range, and effectively improves the processing quality of the complex curved surface.

Description

technical field [0001] The invention belongs to the field of precision and high-efficiency machining of complex curved surface five-axis numerical control machine tools, and in particular relates to a tool axis vector smoothing method based on machine tool kinematics constraints during complex curved surface five-axis numerical control machining. Background technique [0002] The five-axis CNC machining technology of complex curved surface parts has always been a hot and difficult research point in the field of industrial production. Compared with the three-axis CNC machine tool, the five-axis CNC machine tool adds two rotation axes, and the tool moves relative to the workpiece in three-dimensional space. By adjusting the vector direction of the tool axis, the tool and the surface to be machined have a good contact state, ensuring the machining of the part. Quality, improve tool accessibility, and effectively avoid interference between tool and workpiece. In the five-axis C...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to aim at the existing technical defects. The tool axis vector planning based on the local geometric information of the complex curved surface is difficult to simultaneously satisfy the kinematic characteristics of the machine tool and affect the processing quality of the curved surface. Combining differential geometry, machine tool kinematics, Mathematical optimization method, invented the tool axis vector smoothing method for five-axis CNC machining of complex curved surfaces based on kinematic constraints, which effectively reduces the maximum speed and acceleration of the rotating feed axis during the processing of complex curved surfaces, and realizes precision in five-axis CNC machine tool processing Smooth axis of rotation

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