Volumetric positioning accuracy of a vertical machining center equipped with linear motor drives (evaluated by the laser vector method)

摘要

The accuracy of machined workpieces represents the main criterion for every workshop. One of the most important contributing factors is the geometric accuracy of the machine tool. Machines are nowadays equipped with control systems enabling engineers to perform various types of compensations. In the case of geometric compensations the question stands whether to apply only axial compensations or also inter-axial compensations. The article shows the differences in the geometric accuracy of a vertical machining center equipped with linear motor drives measured in three different cases. The machine tool was checked by the classical method according to the ISO 230-2 standard in different positions within the working volume in each axis and also by the sequential diagonal measurement technique determining the diagonal positioning accuracy. The three cases are represented firstly by the machine tool without compensations, secondly by the machine tool compensated from an ISO 230-2 measurement and thirdly by the machine tool volumetrically compensated from a sequential diagonal measurement.