Correction of Squareness of Translational Axes for Identification of Geometric Deviations Inherent to Five-Axis Machining Centres with a Tilting-Rotary Table

概要

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The present paper describes the correction of the squareness deviations of three orthogonal axes for identifying the geometric deviations inherent to five-axis machining centers with an inclined A-axis. The center offsets of the circular trajectory of simultaneous three-axis or four-axis control movement including one axis of rotation were calculated using a simulation model consisting of the homogeneous transformation matrix by changing the geometric deviations individually, and the offsets were made connection with geometric deviations. The geometric deviations which were influenced by the squareness of three orthogonal axes were identified. The relational expressions between the center offset and the geometric deviations were formulated. In order to confirm the influence of the squareness deviations, a five-axis machining center with a tilting rotary table, which is perpendicular to the axis of rotation, was tested. As a result, it was found that the squareness of the orthogonal axes affect the parallelism deviations between the A-axis and the X-axis and the squareness of the C-axis to the A-axis as well as the linear offset of the C-axis of rotation from the A-axis of rotation. The correction of the squareness deviations of three orthogonal axes is indispensable in order to actually apply the proposed identification method.