Method for smoothing machining route of five-axle machining cutter

Abstract

The invention discloses a method for smoothing a machining route of a five-axle machining cutter. The method comprises the steps of obtaining a discrete attitude vector and a position vector of a five-axle machining cutter on a unit spherical surface; obtaining a transformation quaternion according to the discrete attitude vector; carrying out parameter interpolation optimization of the transformation quaternion in the quaternion space by the least square method so as to obtain optimized unit quaternion; obtaining the optimized discrete attitude vector that is located on the unit spherical surface according to the optimized unit quaternion; carrying out the interpolation optimization of the position vector by adopting the least square method; obtaining the smooth machining route by the interpolation-optimized position vector and the optimized discrete attitude vector; and inputting the smooth machining route into a five-axle numerically-controlled machine tool so as to realize the machining of workpieces. According to The method disclosed by the invention, the interpolation of the discrete attitude points on the unit spherical surface can be conducted to form a continuous smooth trace, and the cutting is conducted practically by the smooth trace to enhance machining precision.

Description

technical field [0001] The invention belongs to the technical field of computer numerical control machining, and more specifically relates to a method for smoothing a machining path of a five-axis machining tool. Background technique [0002] Compared with the traditional three-axis CNC machining, five-axis CNC machining has obvious advantages in improving processing quality, reducing processing costs and reducing processing time. The generation of the processing path has a great influence on the processing efficiency and processing quality. In the five-axis linkage CNC machining, the machining path includes two parts: one is the translation of the tool contact, which is essentially the motion of the particle in space; the other is the rotation of the tool axis, which is the change of the tool attitude. Therefore, the essence of the attitude change is the movement of the particle on the unit sphere. [0003] In five-axis machining, although the tool attitude can be adjuste...

AI Technical Summary

Problems solved by technology

Given a series of tool attitude point vectors, these attitude point vectors can be regarded as discrete points on the unit sphere, and there are many ways to interpolate these discrete points to generate a continuous trajectory, such as Lagrange polynomial interpolation , parameter cubic curves, etc., but these methods cannot guarantee that the generated curves are still on the unit sphere, and more importantly, these generated curves are discontinuous and not smooth, which leads to low precision of tool processing

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