Four Methods for Roundness Evaluation

Sui, Wentao; Zhang, Dan

doi:10.1016/j.phpro.2012.02.317

Cited by 73 publications

(40 citation statements)

References 4 publications

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“…The roundness (RON) and concentricity (CON) were calculated from the CRO experimental results (Figure 6a). Among the different mathematical methods available, the least squares circles method [43] was applied in this work. To evaluate the least square circumference center, a nonlinear iterative mathematical model was considered, minimizing the function error (Equation (1)) and taking the seed as the rotation center.…”

Section: Methodsmentioning

confidence: 99%

Parametric Analysis of Macro-Geometrical Deviations in Dry Turning of UNS A97075 (Al-Zn) Alloy

Martín-Béjar

Vilches

Gamboa

et al. 2019

Metals

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Macro-geometrical deviations play a very important role in the functionality and reliability of structural parts for aircraft. The use of environmentally friendly techniques, such as dry machining, may negatively affect these deviations. Despite its importance, there is a lack of research that analyzes them as a function of the cutting parameters in the case of aluminum alloys for aeronautical purpose. In this work, the cutting speed and feed influence on several macro-geometrical deviations (parallelism, straightness, circular run-out, roundness, concentricity, total circular run-out and cylindricity) in dry turning of UNS A97075 alloy was analyzed. The main novelty of this work lies in the use of high slenderness parts used in further fatigue tests. The results showed that feed seems to be the most influential parameter in most of the deviations studied. In addition, the parts with lower rigidity exhibited higher sensitivity to change with the cutting parameters. Finally, different parametric models were proposed to obtain the geometrical deviations as a function of the cutting parameters.

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Section: Methodsmentioning

confidence: 99%

Parametric Analysis of Macro-Geometrical Deviations in Dry Turning of UNS A97075 (Al-Zn) Alloy

Martín-Béjar

Vilches

Gamboa

et al. 2019

Metals

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“…The two-point method utilizes the opposite measurement of the shaft diameter using a simple uniaxial measuring instrument, such as an outside micrometer or a caliper. The calculated mean values, the center position and the form deviation itself show large errors [14], [9].…”

Section: Subject and Methodsmentioning

confidence: 90%

“…The result of the roundness deviation measurement depends mainly on the number and distribution of the measuring points and on the ideal element selected. The ISO 6318 standard prescribes for roundness 4 possible methods for selecting the ideal element: the LSC, MCC, MIC, and MZC [8], [9].…”

Section: Subject and Methodsmentioning

confidence: 99%

Measurement of Maximum Deviation from Roundness Based on the Inverse Kinematics Principle

Stejskal

Dovica

Kelemenová

et al. 2019

Measurement Science Review

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The article deals with a special method of measuring the maximum deviation of objects from roundness based on the inverse kinematics principle. The inverse measurement mechanism is based on the immobility of the measuring probes and the object performing all the motions required to measure a dimension. The advantage of this principle is minimization of the temperature change, while the adverse effect in the measurement system is greatly reduced at the same time. The measurement methodology requires a special software evaluation of the data measured. The aim of the given measurement methodology was to establish the maximum roundness deviation that corresponds to the Least Squares Circle (LSC) method. An experiment with three measuring probes was conducted to verify the methodology.

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“…Additionally, in order to determine other accurate roundness values, in this paper we have also followed the ANSI dimensioning and tolerance standard Y14.5 (Asme 14.5M:, 1994) that defines tolerances of a shape with reference to an ideal geometric feature. Minimum Zone Circle (MZC), the Least Square Circle (LSC) and the Minimum Circumscribed Circle (MCC) (Samuel & Shunmugam, 2003;Simonyan, Grishin, Vatolin, & Popov, 2008;Sui & Zhang, 2012;Xiuming & Jingcai, 2014) have been considered. All these methods calculate the roundness value using different algorithms based on the inner and/or outer circle of atoms from the maximum intensity peak.…”

Section: Methodsmentioning

confidence: 99%

HAADF-STEM Image Resolution Enhancement Using High-Quality Image Reconstruction Techniques: Case of the Fe₃O₄(111) Surface

et al. 2019

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From simple averaging to more sophisticated registration and restoration strategies, such as super-resolution (SR), there exist different computational techniques that use a series of images of the same object to generate enhanced images where noise and other distortions have been reduced. In this work, we provide qualitative and quantitative measurements of this enhancement for high-angle annular dark-field scanning transmission electron microscopy imaging. These images are compared in two ways, qualitatively through visual inspection in real and reciprocal space, and quantitatively, through the calculation of objective measurements, such as signal-to-noise ratio and atom column roundness. Results show that these techniques improve the quality of the images. In this paper, we use an SR methodology that allows us to take advantage of the information present in the image frames and to reliably facilitate the analysis of more difficult regions of interest in experimental images, such as surfaces and interfaces. By acquiring a series of cross-sectional experimental images of magnetite (Fe3O4) thin films (111), we have generated interpolated images using averaging and SR, and reconstructed the atomic structure of the very top surface layer that consists of a full monolayer of Fe, with topmost Fe atoms in tetrahedrally coordinated sites.

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Four Methods for Roundness Evaluation

Cited by 73 publications

References 4 publications

Parametric Analysis of Macro-Geometrical Deviations in Dry Turning of UNS A97075 (Al-Zn) Alloy

Parametric Analysis of Macro-Geometrical Deviations in Dry Turning of UNS A97075 (Al-Zn) Alloy

Measurement of Maximum Deviation from Roundness Based on the Inverse Kinematics Principle

HAADF-STEM Image Resolution Enhancement Using High-Quality Image Reconstruction Techniques: Case of the Fe₃O₄(111) Surface

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Four Methods for Roundness Evaluation

Cited by 73 publications

References 4 publications

Parametric Analysis of Macro-Geometrical Deviations in Dry Turning of UNS A97075 (Al-Zn) Alloy

Parametric Analysis of Macro-Geometrical Deviations in Dry Turning of UNS A97075 (Al-Zn) Alloy

Measurement of Maximum Deviation from Roundness Based on the Inverse Kinematics Principle

HAADF-STEM Image Resolution Enhancement Using High-Quality Image Reconstruction Techniques: Case of the Fe3O4(111) Surface

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Product

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HAADF-STEM Image Resolution Enhancement Using High-Quality Image Reconstruction Techniques: Case of the Fe₃O₄(111) Surface