Method for identifying position-independent errors of double rotating shafts of cradle-type five-axis machine tool

Abstract

The invention discloses a method for identifying position-independent errors of double rotating shafts of a cradle-type five-axis machine tool. The invention discloses a method for detecting the position-independent errors of double rotary tables of the cradle-type five-axis machine tool at any rotating shaft position, and the method is characterized in that a universal double-rotary-table linkage track is designed by utilizing a ball bar instrument aiming at the cradle-type five-axis machine tool with any rotary table axis position structure, a kinematics error model between a workpiece end and a cutter end is established according to a global representation form of unit dual quaternion and the error definition, the problem that the motion of the ball bar instrument and the collection rate are not synchronous is solved through the uniform differentiation processing of a motion track, and the simplified error kinematics model is decoupled based on a least square algorithm in combination with the experimental data of the ball-bar instrument so as to identify the position-independent combination error of the double rotary tables. According to the method, the position-independent geometric error identification is carried out through a single experiment track, the method is suitable for various cradle-type five-axis machine tools with any rotating shaft position structures, and the method is simple and rapid and is good in practicability.

Description

technical field [0001] The invention belongs to the technical field of detection of numerical control machine tools, and in particular relates to an identification method for the position-independent geometric error of a cradle-type five-axis machine tool with an arbitrary rotation axis position structure. [0002] technical background [0003] Compared with the three-axis machine tool, the five-axis machine tool can adjust the relative direction between the tool and the processing plane by turning the rotary axis, so that it has better flexibility and higher efficiency. The cradle-type five-axis machine tool is the most widely used type of machine tool in the processing of small complex curved surface parts. It can be divided into intersecting structure and non-intersecting structure according to the position of the dual rotation axes. Intersecting coplanar structures, as a special case of non-intersecting structures, are the subject of many research and experimental methods...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the measurement principle of the ballbar, there will be a problem that the synthetic motion of the ballbar is not synchronized with the sampling frequency of the ballbar during the multi-axis synchronous movement, and there is rarely a general and simple measurement method suitable for any rotation axis Position-Independent Measurement of Geometric Errors in Cradle-Type Five-Axis Machine Tool Dual Rotary Axes

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