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  • 1.
    Daemi, Bita
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Manufacturing and Metrology Systems.
    Tomkowski, Robert
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Manufacturing and Metrology Systems.
    Archenti, Andreas
    KTH, School of Industrial Engineering and Management (ITM), Centres, Design and Management of Manufacturing Systems, DMMS. KTH, School of Industrial Engineering and Management (ITM), Production Engineering.
    High precision 3D evaluation method for Vickers hardness measurement2020In: CIRP annals, ISSN 0007-8506, E-ISSN 1726-0604Article in journal (Refereed)
    Abstract [en]

    Hardness measurement is a vital step for quality assurance in manufacturing of a wide range of products. Today, the standard hardness measurement tests, such as Vickers, are based on microscope image-based evaluation methods. Since these methods are limited to the geometry of the indentation in 2D images, their precision are highly dependent on the samples’ surface finish. A novel method based on 3D surface topography of the indentation is introduced for more robust Vickers hardness measurement. The 3D evaluation method with information in Z direction offers a high level of precision in hardness measurement on surfaces with different surface qualities.

  • 2.
    Ibaraki, Soichi
    et al.
    Hiroshima University.
    Archenti, AndreasKTH, School of Industrial Engineering and Management (ITM), Production Engineering, Manufacturing and Metrology Systems.
    Special Issue on Machine Accuracy Evaluation2020Collection (editor) (Refereed)
    Abstract [en]

    The accuracy of a three-dimensional (3D) positioning system can ultimately be evaluated via measurement of a 3D vector between command and actual end-effector positions at arbitrary points over the entire workspace. This is a simple, yet challenging, metrological problem. The motion accuracy of a machine tool is traditionally evaluated on an axis-to-axis basis, with every error motion of every axis being independently measured as part of a one-dimensional measurement process in a different setup. Toward the ultimate goal of 3D position measurement over the entire workspace, research efforts have offered several new, practical measurement technologies.

    This special issue covers the technical and academic efforts regarding the evaluation of machine tool accuracy. The papers in this special issue clarify the latest research frontiers regarding machine tool accuracy from a metrological viewpoint. In the first paper, by Montavon et al., error calibration technologies and their management are reviewed within the Internet of production concept. Long-term accuracy monitoring and management are clearly among the most crucial technical challenges faced regarding machine tools, and the work by Xing et al. is related to them. Ibaraki et al. presented machining tests to evaluate the thermal distortion of a machine tool. Peukert et al. studied the dynamic interaction between machine tools and their foundations. Various 3D measurement schemes for determining machine error motions have been investigated by many researchers, and some have been implemented in industrial applications. Kenno et al. and Florussen et al. investigated 3D measurement using the R-test for five-axis machines. Miller et al. studied simultaneous measurement of six-degree-of-freedom error motions of a linear axis. Nagao et al. presented an error calibration method for a parallel kinematic machine tool.

    The editors appreciate the contributions of all the authors, as well as the work of the reviewers. We are confident that this special issue will further encourage research and engineering work for improving the accuracy and performance of machine tools.

  • 3.
    Wei, Yuan
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Manufacturing and Metrology Systems.
    Effects of micro textured sapphire tool regarding cutting forces in turning operations2017In: International Journal of Precision Engineering and Manufacturing-Green Technology, ISSN 2288-6206, Vol. 4, no 2, p. 141-147Article in journal (Refereed)
    Abstract [en]

    In this study, the effects of microscale textures on a sapphire cutting tool were investigated. The texturing of microscale features on a solid surface allowed control of the tribological characteristics of the tool surface. Microscale geometrical characteristics on the rake face of the sapphire tools were obtained through micro-abrasive blasting. Tribological tests and cutting tests on an aluminum alloy workpiece were carried out, and the cutting forces were measured and analyzed. The effect of texture on adhesion of work material was investigated. Results showed that friction was minimized and cutting forces at the tool-chip interface of the textured tool were significantly reduced from those of a conventional tool. It was observed that the adhesion of work material was reduced by applying texture on the tool rake face.

  • 4.
    Yuan, Wei
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Manufacturing and Metrology Systems. KTH.
    Tomkowski, Robert
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Manufacturing and Metrology Systems. KTH.
    Archenti, Andreas
    KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Manufacturing and Metrology Systems. KTH.
    Numerical Study of the Influence of Geometric Features of Dimple Texture on Hydrodynamic Pressure Generation2020In: MDPI Metals, Vol. 10(3), article id 361Article in journal (Refereed)
    Abstract [en]

    Controlling friction and wear are essential for reducing energy loss and lengthening the life span of friction pairs in sliding contacts. Surface texturing is an effective and efficient way to reduce friction and wear, especially under lubricated conditions. Dimple texture on friction pair surfaces has been verified to enhance the lubrication condition and shift the lubrication regime by generating additional hydrodynamic pressure. However, the geometric features and distribution of the microstructures considerably influence the production of additional pressure. Choosing and designing dimple texture with suitable geometric features is necessary and important for texturing applications. In this study, computational fluid dynamics (CFD) are used to investigate the effect of the geometric features of dimple textures on pressure build-up. The influence of dimple shapes, dimple depths, minimum film thickness, dimple densities, and dimple surface angles are presented and discussed. Notably, the influence of the dimple surface angle is introduced and presented.

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