| Summary: | 碩士 === 國立虎尾科技大學 === 自動化工程研究所 === 98 === Computer numerical control (CNC) machine tool is widely applied on the machinery processing industry. In order to decrease the processing time and increase the accuracy of products, five-axis CNC machine tool gradually supplants three-axis CNC machine tool. Five-axis CNC machine tool is composed of three linear axes and two rotary axes, so it has the multi-directional manufacturing ability. Thus, the properties of its simulataneous multi-axis movement are focused.
In this paper, two measurement systems for five-axis CNC machine tools are presented. One is a five-degree-of-freedom geometrical measurement system, (5-DOF GMS), and the other is an optical calibration system (OCS).
The 5-DOF GMS is composed of a static-detector-head and a laser measurement device. Along the planning measurement path, 2L+1R, 3L+1R and 3L+2R, the five-degree-of-freedom error of the simultaneous multi-axis movement of five-axis machine tools can be obtained. The results of the experiment evidence that the linear and angular accuracies of the 5-DOFGMS achieve ±0.3 μm and ± 0.3 arcsec, respectively.
The OCS is composed of two laser sources, two quadrant detectors and a ball lens. According to the planning measurement path of the ISO/CD 10791-6 which is a draft of International Standards Organization, the three-dimension error of the simulataneous multi-axis movement of five-axis machine tools can be obtained. The results of the experiment evidence that the eccentric of the rotary stage as the simulataneous multi-axis movement can be effectively compensated and the linear accuracy of the OCS achieve ±0.3 μm.
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