Volumetric Compensation of Threeaxis Vertical Machining Centre

Holub, Michal; Blecha, Petr; Bradac, Frantisek; Kana, Roman

doi:10.17973/mmsj.2015_10_201534

Cited by 9 publications

(7 citation statements)

References 1 publication

(1 reference statement)

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“…The volumetric accuracy of the machine was verified for the calibration cycle (LTc1) and the verification cycle (LTc2) according to the procedure described in [5]. Intermediate rigid body type 3 (IRB3) was chosen as a kinematic model.…”

Section: Volumetric Accuracymentioning

confidence: 99%

“…These conditions can be considered stable for calibration measurements LTc1 (see Section 3.1). The principle of measuring and determining LaserTRACER positions (P1, P2, P3 and P4) is described in publications [4,5]. In the verification measurements, temperature change on the X-axis did not exceed 0.3 • C, 0.6 • C on the Y-axis and 1.0 • C on the Z-axis.…”

Section: Volumetric Accuracymentioning

confidence: 99%

“…The robustness of a compensation method, with respect to the human factor, is presented in reference [4]. In reference [5], the effect of volumetric compensation on the improvement of the geometric accuracy of a small machining centre, by up to 60%, is presented. The increase of the volumetric accuracy of a five-axis machining centre using a reconfigurable artefact is presented in [6].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the Volumetric Error Effect on the Resulting Working Accuracy—Roundness

et al. 2020

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Currently, various types of software compensations are applied to machine tools. Their aim is to increase the working accuracy of the tools. The improvement in working accuracy is then further assessed according to the increase in the dimensional and shape accuracy or the surface quality of the workpiece. This publication describes the effects of the volumetric accuracy of a machine tool on the working accuracy of a workpiece, where total roundness (RONt) is evaluated in multiple cuts. In the experiment, two test workpieces are manufactured on a three-axis milling machining centre. The first is made using a standard machine setup while the second with activated volumetric compensation. The LaserTRACER self-tracking laser interferometer is used to compensate for volumetric accuracy. In the second part, verification measurements are performed with a Ballbar, where roundness error is evaluated according to ISO 230-4. Then two test workpieces are machined, and, in the last part, measurement is performed on Talyrond 595S roundness measuring equipment. Finally, the results are analysed and the dependence between the volumetric accuracy, the circularity error of the machine and the working accuracy of the CNC machine tool is established, represented by the RONt of the workpiece. This paper presents new and unpublished relations between the volumetric accuracy of the machine tool and the RONt of the workpiece.

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Section: Volumetric Accuracymentioning

confidence: 99%

Section: Volumetric Accuracymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Study of the Volumetric Error Effect on the Resulting Working Accuracy—Roundness

et al. 2020

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“…These errors, including spindle errors, are shown for the three-axis vertical milling machine in Figure 1. The kinematic chain of the three-axis machine tool presented below corresponds to W (Workpiece) -X-Y-Z-T (Tool) [8].…”

Section: Geometric Accuracymentioning

confidence: 99%

Geometric Accuracy, Volumetric Accuracy and Compensation of CNC Machine Tools

Marek¹,

Holub²,

Marek³

et al. 2020

Machine Tools [Working Title]

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The production of geometrically and dimensionally defined workpieces is what the user expects from a machine tool. Deviations from these prescribed dimensions and geometry are due to machine inaccuracies. Therefore, it was necessary to develop tests and tests on the properties and parameters of machine tools that can detect these. Every new machine tool undergoes these tests.How to perform and evaluate these tests is determined and recommended primarily by standards and regulations. When testing the properties of machines, it is not only about knowing and knowing how to measure machines, but also how I can analyze and apply the obtained results. Is it necessary to do a mechanical intervention of the machine or is it enough to compensate the software?

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“…Due to the increased importance of integrating metrology systems to machine tools to online compensate volumetric errors of machine tools for improving machining efficiency and accuracy, Wang and Maropoulos [2] developed a real-time volumetric error compensation algorithm to improve the dynamic path accuracy of a machine tool using a laser tracker-assisted 3-axis positioning system. Holub et al [18] identified volumetric errors of a small three-axis vertical machining center using a laser interferometer, and ballbar tests were used to validate the volumetric error compensation results. Later, Holub et al [19] performed on-the-fly tracking experiments on the small three-axis machining center to measure the volumetric errors of the small three-axis machining center using a self-tracking interferometer, and then compared the measurement time and results with conventional trigger-or time-based measurements to show the superior performance of on-the-fly measurement.…”

Section: Introductionmentioning

confidence: 99%

Using the Segmented Iterative Learning Control Method to Generate Volumetric Error-Compensated Part Programs for Three-Axis CNC Milling Machine Tools

Yeh

2018

JMMP

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This study proposes using the iterative learning control method to adjust the volumetric error-compensated tool path, where the working volume motion accuracy of three-axis computerized numerical control (CNC) milling machine tools is increased by segmented modification of the part program. As the three-axis CNC milling machine tools generally have volumetric error of working volume, this study refers to the measured and established table of volumetric errors and uses the method of the modifying part program for volumetric error compensation of machine tools. This study proposes using part-program single-block positioning segmented for volumetric error compensation, as the generated compensated part program with multiple compensated blocks can effectively compensate the volumetric error of working volume in the tool moving process. In terms of the compensated tool path computing method, this study uses the iterative learning control (ILC) method and refers to compensated tool path and volumetric errors along the compensated tool path for iterative computation. Finally, a part program with multiple blocks is modified by the converged optimal compensated tool path, in order that the modified part program has higher-precision volumetric error compensation effect. The simulation result shows that the rate of improvement of error of the volumetric error compensation method proposed in this study is 70%.The result of cutting tests shows that the average rate of improvement of the straightness error of the test workpiece is 60%, while the average rate of improvement of height error is 80%. Therefore, the results of simulation and cutting tests can prove the feasibility of using the ILC method for segmented modification of the volumetric error-compensated part programs proposed in this study.

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Volumetric Compensation of Threeaxis Vertical Machining Centre

Cited by 9 publications

References 1 publication

Experimental Study of the Volumetric Error Effect on the Resulting Working Accuracy—Roundness

Experimental Study of the Volumetric Error Effect on the Resulting Working Accuracy—Roundness

Geometric Accuracy, Volumetric Accuracy and Compensation of CNC Machine Tools

Using the Segmented Iterative Learning Control Method to Generate Volumetric Error-Compensated Part Programs for Three-Axis CNC Milling Machine Tools

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