The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Soichi Ibaraki - One of the best experts on this subject based on the ideXlab platform.
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A Machining Test to evaluate thermal influence on the kinematics of a five-axis machine tool
International Journal of Machine Tools and Manufacture, 2021Co-Authors: Soichi Ibaraki, Rin OkumuraAbstract:Abstract The thermal deformation of a machine tool, typically caused by environmental temperature variations or the heat generated by a rotating spindle, often changes the position and orientation errors of the rotary axis average lines. By applying kinematic modeling of a five-axis machine tool, this paper shows that they can be estimated from the finished geometry of any Test piece, provided that the Test piece contains the features that are sufficiently sensitive to them. Based on the kinematic analysis of their influence, a new Machining Test is proposed to evaluate the thermal influence on the position and orientation errors of the rotary axis average lines. By inversely solving the five-axis kinematic model, this paper shows that the position and orientation errors of the rotary axis average lines can be analytically identified by the finished Test piece geometry. An experimental case study demonstrates that the position and orientation errors of the rotary axis average lines, which change due to the thermal influence, can be observed from the finished Test piece geometry.
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Machining Tests to Evaluate Machine Tool Thermal Displacement in Z-Direction: Proposal to ISO 10791-10
International Journal of Automation Technology, 2020Co-Authors: Soichi Ibaraki, Rin OkumuraAbstract:Thermal deformation is one of the contributors of critical errors of machine tools. ISO 10791-10 describes standardized Tests to evaluate a machine tool’s thermal deformation; however, they do not include cutting operations. By repeatedly performing the same Machining feature, one can observe the change in geometric accuracy, which is typically caused by the thermal influence of the environment or the heat generated by the machine tool. This paper proposes a simple Machining Test to evaluate a machine tool’s thermal displacement in the tool’s axial direction (Z-direction). Together with a technical committee of the Japan Machine Tool Builders’ Association, the authors proposed the revision of ISO 10791-10 in ISO/TC39/SC2 to add the present Machining Tests. This paper presents the Test procedures and case studies as well as a comparison with an alternative Machining Test.
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A Machining Test to identify rotary axis geometric errors on a five-axis machine tool with a swiveling rotary table for turning operations
Precision Engineering, 2019Co-Authors: Soichi Ibaraki, Ibuki Yoshida, Tetsushi AsanoAbstract:Abstract Lately, a cylindrical workpiece of relatively large diameter is often machined by turning operations by a swiveling rotary table in a five-axis Machining center. This paper presents a Machining Test containing features finished by a turning operation by a swiveling rotary table. Unlike conventional Machining Tests for turning operations described in ISO 13041-6:2009, the present Machining Test can identify a complete set of position and orientation errors of the axis average line of rotary axes from the geometry of the finished Test piece. The radial and axial error motions of the rotary table can be also observed when the swiveling axis is positioned horizontal ( A = 0 ∘ ) and vertical ( A = − 90 ∘ ). Experimental demonstration is presented. The rotary axis geometric errors identified from the finished Test piece's geometry are compared with those estimated by a conventional error calibration Test using a touch-triggered probe and a precision sphere. The uncertainty analysis for the present Machining Test is also presented.
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on machine identification of rotary axis location errors under thermal influence by spindle rotation
Precision Engineering-journal of The International Societies for Precision Engineering and Nanotechnology, 2019Co-Authors: Soichi Ibaraki, Cefu Hong, Hiroki Inui, Shizuo Nishikawa, Masahiro ShimoikeAbstract:Abstract Position and orientation errors of rotary axis average lines are often among dominant error contributors in the five-axis kinematics. Although many error calibration schemes are available to identify them on -machine, they cannot be performed when a machine spindle is rotating. Rotary axis location errors are often influenced by the machine's thermal deformation. This paper presents the application of a non-contact laser light barrier system, widely used in the industry for tool geometry measurement, to the identification of rotary axis location errors, when the spindle rotates in the same speed as in actual Machining applications. The effectiveness of the proposed scheme is verified by experimental comparison with the R-Test and a Machining Test. The uncertainty analysis is also presented.
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A pyramid-shaped Machining Test to identify rotary axis error motions on five-axis machine tools: software development and a case study
The International Journal of Advanced Manufacturing Technology, 2017Co-Authors: Soichi Ibaraki, Shota Tsujimoto, Yu Nagai, Yasutaka Sakai, Shigeki Morimoto, Yosuke MiyazakiAbstract:The pyramid-shaped Machining Test was proposed to evaluate error motions of a five-axis machine tool. This paper presents software to perform and analyze the pyramid-shaped Machining Test. The paper presents an extension of the analysis algorithm to a five-axis machine tool with two rotary axes on the tool side. An experimental case study shows that position and orientation errors (location errors) of rotary axis average lines, as well as position-dependent error motions of a rotary axis, can be numerically identified from geometric errors of the finished Test piece. Experimental demonstration of the numerical compensation of rotary axis geometric errors based on the R-Test is also presented, along with its performance investigation by the present Machining Test. The developed software is commercially available.
Yusuke Ota - One of the best experts on this subject based on the ideXlab platform.
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A Machining Test to Evaluate Geometric Errors of Five-axis Machine Tools with its Application to Thermal Deformation Test
Procedia CIRP, 2014Co-Authors: Soichi Ibaraki, Yusuke OtaAbstract:Abstract This paper proposes a Machining Test to calibrate position-dependent geometric errors, or “error map,” of rotary axes of a five-axis machine tool. At given sets of angular positions of rotary axes, a simple straight side-cutting using a straight end mill is performed. By measuring geometric errors of the machined Test piece, position and orientation of rotary axis average lines (location errors), as well as position-dependent geometric errors of rotary axes, can be numerically identified based on the machine's kinematic model. Furthermore, by repeating the proposed Machining Test consequently, one can quantitatively observe how the position and the orientation of rotary axes change with respect to the tool spindle due to thermal deformation induced mainly by tool spindle rotation. Experimental demonstration is presented.
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A Machining Test to calibrate rotary axis error motions of five-axis machine tools and its application to thermal deformation Test
International Journal of Machine Tools and Manufacture, 2014Co-Authors: Soichi Ibaraki, Yusuke OtaAbstract:Abstract This paper proposes a Machining Test to parameterize error motions, or position-dependent geometric errors, of rotary axes in a five-axis machine tool. At the given set of angular positions of rotary axes, a square-shaped step is machined by a straight end mill. By measuring geometric errors of the finished Test piece, the position and the orientation of rotary axis average lines (location errors), as well as position-dependent geometric errors of rotary axes, can be numerically identified based on the machine׳s kinematic model. Furthermore, by consequently performing the proposed Machining Test, one can quantitatively observe how error motions of rotary axes change due to thermal deformation induced mainly by spindle rotation. Experimental demonstration is presented.
Rin Okumura - One of the best experts on this subject based on the ideXlab platform.
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A Machining Test to evaluate thermal influence on the kinematics of a five-axis machine tool
International Journal of Machine Tools and Manufacture, 2021Co-Authors: Soichi Ibaraki, Rin OkumuraAbstract:Abstract The thermal deformation of a machine tool, typically caused by environmental temperature variations or the heat generated by a rotating spindle, often changes the position and orientation errors of the rotary axis average lines. By applying kinematic modeling of a five-axis machine tool, this paper shows that they can be estimated from the finished geometry of any Test piece, provided that the Test piece contains the features that are sufficiently sensitive to them. Based on the kinematic analysis of their influence, a new Machining Test is proposed to evaluate the thermal influence on the position and orientation errors of the rotary axis average lines. By inversely solving the five-axis kinematic model, this paper shows that the position and orientation errors of the rotary axis average lines can be analytically identified by the finished Test piece geometry. An experimental case study demonstrates that the position and orientation errors of the rotary axis average lines, which change due to the thermal influence, can be observed from the finished Test piece geometry.
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Machining Tests to Evaluate Machine Tool Thermal Displacement in Z-Direction: Proposal to ISO 10791-10
International Journal of Automation Technology, 2020Co-Authors: Soichi Ibaraki, Rin OkumuraAbstract:Thermal deformation is one of the contributors of critical errors of machine tools. ISO 10791-10 describes standardized Tests to evaluate a machine tool’s thermal deformation; however, they do not include cutting operations. By repeatedly performing the same Machining feature, one can observe the change in geometric accuracy, which is typically caused by the thermal influence of the environment or the heat generated by the machine tool. This paper proposes a simple Machining Test to evaluate a machine tool’s thermal displacement in the tool’s axial direction (Z-direction). Together with a technical committee of the Japan Machine Tool Builders’ Association, the authors proposed the revision of ISO 10791-10 in ISO/TC39/SC2 to add the present Machining Tests. This paper presents the Test procedures and case studies as well as a comparison with an alternative Machining Test.
Ryuta Sato - One of the best experts on this subject based on the ideXlab platform.
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Sensitivity Analysis Between Error Motions and Machined Shape Errors in Five-Axis Machining Centers: In Case of S-Shaped Machining Test by a Square End Mill
Volume 2: Processes; Materials, 2019Co-Authors: Ryuta Sato, Keiichi Shirase, Yukitoshi IharaAbstract:Abstract Five-axis Machining center, combined three linear and two rotary axes, has been increasingly used in complex surface Machining. However, as the two additional axes, the machined surface under table coordinate system is usually different from the tool motion under machine coordinate system, and as a result, it is very tough to predict the machined shape errors caused by each axes error motions. This research presents a new kind of sensitivity analysis method, to find the relationship between error motions of each axis and geometric errors of machined shape directly. In this research, the S-shaped Machining Test is taken as a sample to explain how the sensitivity analysis makes sense. The results show that the presented sensitivity analysis can investigate how the error motions affect the S-shaped Machining accuracy and predicted the influence of error motions on certain positions, such as the reversal errors of the axes around motion reversal points. It can be proved that the presented method can help the five-axis Machining center users to predict the Machining errors on the designed surface of each axes error motions.
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Influence of NC Program Quality and Geometric Errors of Rotary Axes on S-Shaped Machining Test Accuracy
Journal of Manufacturing and Materials Processing, 2018Co-Authors: Ryuta Sato, Keiichi Shirase, Yukitoshi IharaAbstract:An S-shaped Machining Test is proposed for the ISO 10791-7 standard to verify the performance of five-axis Machining centers. However, investigation of the factor that has the most influence on the geometrical accuracy of finished S-shaped workpieces has not been undertaken. Determination of the influence of NC program tolerance and geometric errors concerning the rotary axes on the accuracy of the finished S-shaped workpiece forms the main objective of the study. Actual cutting experiments as well as simulations were performed during the proposed investigation. Our results clarify that NC-program tolerance has a significant influence on the end quality of the machined surface. Although geometric errors pertaining to rotary axes also have a significant influence on machined-surface quality, it is difficult to evaluate the influence of each individual error, because all geometric errors make glitches at the same point on the machined surface. The proposed S-shaped Machining Test can be used to provide a complete demonstration of available Machining techniques.
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Study on the Influence of Geometric Errors in Rotary Axes on Cubic-Machining Test Considering the Workpiece Coordinate System
Precision Engineering, 1Co-Authors: Ryuta Sato, Keiichi Shirase, Shigehiko SakamotoAbstract:Abstract Evaluating the influence of geometric errors in rotary axes is a common method used by a five-axis machine tool for improving the Machining accuracy. In conventional geometric error models, the table coordinate system is considered as the final workpiece coordinate system. In this study, an additional workpiece coordinate transformation was proposed to identify the influence of geometric error. First, a cubic Machining Test was conducted. Second, the necessity of workpiece coordinate transformation was analyzed, and a method for coordinate transformation was proposed. In addition, both Machining simulation and an actual Machining experiment of the cubic Machining Test were conducted to verify the efficiency of the proposed method. The results indicate that the workpiece coordinate transformation is an essential part of the geometric error model for accurately simulating the geometric error influence. The method for identifying the geometric error influence considering the workpiece coordinate transformation is applicable in manufacturing.
Shigehiko Sakamoto - One of the best experts on this subject based on the ideXlab platform.
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Study on the Influence of Geometric Errors in Rotary Axes on Cubic-Machining Test Considering the Workpiece Coordinate System
Precision Engineering, 1Co-Authors: Ryuta Sato, Keiichi Shirase, Shigehiko SakamotoAbstract:Abstract Evaluating the influence of geometric errors in rotary axes is a common method used by a five-axis machine tool for improving the Machining accuracy. In conventional geometric error models, the table coordinate system is considered as the final workpiece coordinate system. In this study, an additional workpiece coordinate transformation was proposed to identify the influence of geometric error. First, a cubic Machining Test was conducted. Second, the necessity of workpiece coordinate transformation was analyzed, and a method for coordinate transformation was proposed. In addition, both Machining simulation and an actual Machining experiment of the cubic Machining Test were conducted to verify the efficiency of the proposed method. The results indicate that the workpiece coordinate transformation is an essential part of the geometric error model for accurately simulating the geometric error influence. The method for identifying the geometric error influence considering the workpiece coordinate transformation is applicable in manufacturing.
