All position-dependent geometric error identification for rotary axes of five-axis machine tool using double ball bar
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ORIGINAL ARTICLE
All position-dependent geometric error identification for rotary axes of five-axis machine tool using double ball bar Qingzhao Li 1 & Wei Wang 1 & Jing Zhang 1 & Hai Li 1 Received: 23 May 2020 / Accepted: 17 August 2020 / Published online: 23 August 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract The position-dependent geometric errors (PDGEs) of the rotary axes have a critical influence on the accuracy of the five-axis machine tool. It is necessary to measure, identify, and further compensate the PDGEs to improve the accuracy of the five-axis machine tool. The present study presents a method to identify the PDGEs of the rotary axes using the double ball bar (DBB). The presented method requires eight measurement patterns based on four different installation positions of the DBB. All 12 PDGEs of the rotary axes can be identified, especially the angular positioning error that cannot be identified in most of the other presented methods. Experimental verification is carried out, and the measurement uncertainty and the limitations of the presented method are analyzed. Compared with some other reported studies, the advantage of the presented method is that it can identify all PDGEs of the rotary axis and requires less measurement patterns. Keywords Position-dependent geometric errors . Rotary axes . Five-axis machine tool . Double ball bar
1 Introduction Five-axis machine tools with two additional rotary axes are the key equipment in the manufacture of the monolithic parts with geometric complexity because of the advantages of high flexibility and efficiency. However, the rotary axes bring more geometric errors that affect the machine tool accuracy at the same time. It is necessary to compensate the geometric errors to improve the machine tool accuracy considering that the systematic geometric error is one of the critical error sources of the machine tools [1]. Accurate measurement and identification of the geometric errors is a prerequisite for error compensation. At present, several methods have been developed for the measurement of the machine tool geometric errors based on different measurement instruments. Generally, the measurements of the linear axis and rotary axis are performed separately. Using laser interferometer to measure geometric errors
* Wei Wang [email protected] 1
School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
of the linear axis is the most common method, such as the 22-, 14-, and 9-line methods [2–4]. Afterwards, the 12- and 13-line methods were proposed with better identification accuracy [5]. A laser step diagonal measurement method was presented with high measurement efficiency at the same time [6]. These measurement methods are indirect ones that need to use the error modeling for the geometric error identification. Nowadays, the six-dimension laser interferometer is applied to directly measure the position and angular errors of a linear axis [7]. Overall, the measurement
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