Dynamic performance test under complicated motion states for five-axis machine tools based on double ballbar
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ORIGINAL ARTICLE
Dynamic performance test under complicated motion states for five-axis machine tools based on double ballbar Qicheng Ding 1 & Wei Wang 1 & Li Du 1 & Jiexiong Ding 1 & Jing Zhang 1 & Liping Wang 2 Received: 2 June 2020 / Accepted: 14 September 2020 / Published online: 3 October 2020 # Springer-Verlag London Ltd., part of Springer Nature 2020
Abstract During five-axis CNC machining, the dynamic tracking error caused by imperfect servo dynamic performance is becoming the major factor affecting the accuracy during high-speed and high-precision manufacturing. The double ballbar (DBB) test is one of the commonly used dynamic performance tests, but existing DBB test methods do not have satisfactory test capability for the requirement of complex freeform surface machining. In this paper, on the basis of summarized of dynamic tracking error’s mechanism and characteristics, an improved dynamic performance test based on DBB, which is named the circle-8 test, is proposed. In this test, a provenly efficient RTCP test trajectory is used to rebuild the DBB test process, which includes complex movements of all the five motion axes. To exhibit the improvement of the circle-8 test, this test and the BK3 test of ISO standard, which is considered as a comparison, are conducted in a five-axis machine tool with a tilting rotary table. According to the simulation and experiment results, for common dynamic inaccuracy situations, the circle-8 test always has better sensitivity of dynamic performance test than BK3 test. The above-improved dynamic performance test can be applied to provide effective data for the research of modeling and error reduction of five-axis machine tools. Keywords Five-axis CNC machining . Dynamic tracking error . Double ballbar (DBB) . Complicated motion states
1 Introduction Five-axis CNC machine tools are very important equipment for the manufacturing industry, especially for complexcontour and high-speed manufacturing. The machining error of the five-axis machine tool can be decoupled into geometric error, thermal error, cutting force error, and dynamic tracking error [1]. In the recent years, some researchers have shown that, during the high-speed and high-precision manufacturing process, the dynamic tracking error caused by imperfect dynamic performance may make up a substantial percentage of total error [2, 3].
* Jiexiong Ding [email protected] 1
School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
2
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
The dynamic tracking error is not inherent in machine tool but caused by the delay of each motion axis control process, which is different from geometric error, thermal error, and cutting force error. There are many research issues about the dynamic tracking error. Most of the existing researches about dynamic tracking error can be concluded into dynamic tracking error reduction and dynamic performance test. As for the research of dyna
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