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Influence of different cooling strategies during hard turning of AISI 52100 - part I: thermo-mechanical load, tool wear, surface topography and manufacturing accuracy

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Procedia CIRP 2020年 87卷 77-82页

作者： Stephan Basten Benjamin Kirsch Werner Ankener Marek Smaga Tilmann Beck Julian Uebel Jörg Seewig Jan C. Aurich Institute for Manufacturing Technology and Production Systems TU Kaiserslautern Gottlieb-Daimler-Str. 67663 Kaiserslautern Germany Institute of Materials Science and Engineering TU Kaiserslautern Gottlieb-Daimler-Str. 67663 Kaiserslautern Germany Institute for Measurement and Sensor Technology TU Kaiserslautern Gottlieb-Daimler-Str. 67663 Kaiserslautern Germany

This paper presents a characterization of the turning process for finishing of AISI 52100 in martensitic heat treatment state at various cooling conditions. With regard to the cooling conditions, LN 2 -cooling, CO 2 snow cooling at varied mass flows, sub-zero metalworking fluids (MWF) at varied supply temperatures, and dry machining were examined. The tool temperatures, the process forces, the tool wear, the surface topography as well as the dimensional deviations of the workpiece caused by unintended alterations of the depth of cut due to a thermal expansion or contraction of the workpiece are analyzed. The application of MWF supplied at 20 °C results in an unchanging thermo-mechanical load in the tool-work interface and surface topography as well as in a high manufacturing accuracy. Dry machining leads to an increasing depth of cut of up to 10 %, resulting in radial dimensional errors. Cryogenic machining and using the sub-zero MWF supplied at -30 °C exhibit a different behavior due to high cooling effects: the depth of cut is reduced up to 10 %, also leading to radial dimensional errors. However, even though the depth of cut and thus the undeformed chip cross section is affected by up to 10 % depending the cooling condition, the mechanical load remains approximately constant during single cuts. In part II, the surface and near surface microstructure morphology of the workpieces is characterized.

关键词： cryogenic turning surface integrity accuracy error hard machining precicion turning

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Tracking of Magnetic Micromotors in Confined Channels Through Scattering Tissue

Tracking of Magnetic Micromotors in Confined Channels Throug...

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IEEE International Conference on Nano/Molecular Medicine and engineering (NANOMED)

作者： Azaam Aziz Dmitriy Karnaushenko Nektarios Koukourakis Jürgen W. Czarske Oliver G. Schmidt Mariana Medina-Sánchez Institute for Integrative Nanosciences Leibniz Institute for Solid State and Materials Research Dresden Germany Chair of Measurement and Sensor System Technique and Competence Center BIOLAS TU Dresden School of Engineering Dresden Germany Cluster of Excellence Physics of Life TU Dresden Germany and Faculty of Physics School of Science Dresden TU Germany Professorship of Material Systems for Nanoelectronics Chemnitz University of Technology Chemnitz Germany

ISBN: (纸本)9781665458573

The field of small-scale microdevices is growing rapidly towards the development of tethered/untethered microsensors and therapeutic agents that can move through narrow vascular networks in living organisms to diagnose and treat for example vascular diseases. However, imaging and localization of such microdevices are challenging under scattering tissue due to the lack of high spatial and temporal resolution that compromises the penetration depth and therefore the application scenario. Here, we report the tracking of magnetically-driven rolling micromotors (20 µm in diameter) through scattering tissue (1.2 mm thickness) using reflective infrared (IR) imaging. This technique provides high spatiotemporal resolution for the tracking of micro-agents in a narrow vascular network. As a potential application, we suggest the use of such micro-agents as micro-viscosimeters, in which by analyzing their dynamics, one can extract some basic information on the surrounding fluid properties which might be related to certain health status.

关键词： Stimulated emission Fluid dynamics Scattering Optical imaging Spatiotemporal phenomena Optical scattering Optical reflection

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Frequency Band Broadening and Charge Density Enhancement of a Vibrational Triboelectric Nanogenerator with Two Stoppers

SSRN

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SSRN 2022年

作者： Qi, Youchao Liu, Guoxu Kuang, Yang Wang, Lu Zeng, Jianhua Lin, Yuan Zhou, Han Zhu, Meiling Zhang, Chi CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing101400 China College of Engineering Mathematics and Physical Sciences University of Exeter ExeterEX4 4QF United Kingdom School of Nanoscience and Technology University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory for Manufacturing Systems Engineering International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technologies Collaborative Innovation Center of Suzhou Nano Science and Technology Xi’an Jiaotong University Xi’an710049 China Center on Nanoenergy Research School of Physical Science and Technology Guangxi University China

Vibrational triboelectric nanogenerators (V-TENG) can be used to harvest broadband vibration energy due to the nonlinear impact force induced by a stopper. However, V-TENGs with a single stopper have limited bandwidth and surface charge density, which has limited their application in wideband vibration energy harvesting. Herein, a V-TENG with two stoppers is proposed for frequency band broadening and charge density enhancement. The theoretical analysis and experimental validation have indicated the V-TENG with two stoppers could improve the bandwidth by 75% compared with one stopper at a gap distance of 0.5 mm. Moreover, a charge pump can be constructed with two output channels, which has improved surface charge density by about 14 times. With the frequency varying from 18 to 38 Hz, the V-TENG can continually power 400 LEDs and charge a commercial capacitor quickly. This work has shown an encouraging method for enhancing the performance of V-TENGs, which also has great prospects in harvesting wideband vibration energy from machines, cars, ships, and human motions for self-powered electronics. © 2022, The Authors. All rights reserved.

关键词： Nanogenerators

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Investigating the interlayer electron transport and its in?uence on the whole electric properties of black phosphorus

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Science Bulletin 2019年第4期64卷 254-260页

作者： Bensong Wan Shaoqiang Guo Jiacheng Sun Yufei Zhang Yuyan Wang Caofeng Pan Junying Zhang Key Laboratory of Micro-nano Measurement Manipulation and Physics (Ministry of Education) School of Physics Beihang University CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences School of Nanoscience and Technology University of Chinese Academy of Sciences Center on Nanoenergy Research School of Physical Science and Technology Guangxi University College of Optoelectronic Engineering Shenzhen University

Two-dimensional(2D) nanomaterials have attracted great attention in next generation electronic and optoelectronic technologies due to the unique layered structure and excellent physical and chemical properties. However, the mechanism of transmission along the vertical direction of 2D semiconductor materials has not been investigated. Here, we use first-principles calculations to explore the bandgap energies along different directions, and fabricate a vertical, a lateral and a mixture-structured black phosphorus field effect transistor(BPFET) to study the electrical characteristics along different directions under variable temperatures. The variable temperature test indicates that the mixture-structured device performs more like a lateral device, while the conductance along the vertical direction is hard to be tuned by temperature and electrical field. The unchanged conductance under electric field and variable temperatures allows the vertical device to act as a fixed resistor, promising possible application for the prospective electronic and optoelectronic devices.

关键词： Black phosphorus Transistor Transmission Vertical Variable temperature

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Erratum:Growth of TlBa2Ca2Cu3O9 Epitaxial Thin Films by Two-Step Method in Argon[***.36(2019)057401]

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Chinese Physics Letters 2021年第2期38卷 118-118页

作者： Jian Xing Li-Tian Wang Xiao-Xin Gao Xue-Lian Liang Kai-Yong He Ting Xue Sheng-Hui Zhao Jin-Li Zhang Ming He Xin-Jie Zhao Shao-Lin Yan Pei Wang Lu Ji College of Electronic Information and Optical Engineering Nankai UniversityTianjin 300350China Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin 300350China Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Tianjin 300350China Beijing Institute of Radio Measurement Beijing 100854China

In Fig.2 of the article,[1]the figure caption should be“Rocking curve of the(006)peak of the Tl-1223 thin film”instead of“Rocking curve of the(003)peak of the Tl-1223 thin film”.The corresponding description of this figure should be“As shown in Fig.2,the full width at half maximum(FWHM)of the Tl-1223(006)reflection peak is only 0.58∘,which shows that the film possesses a good crystalline structure”,instead of“As shown in Fig.2,the FWHM of the Tl-1223(003)reflection peak is only 0.58∘,which shows that the film possesses a good crystalline structure”.

关键词： film Cu3O crystalline

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Optical tip vibration measurement in CNC milling machines 19

Optical tip vibration measurement in CNC milling machines

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19th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2019

作者： Zhang, Hao Kuschmierz, Robert Löser, Michael Ihlenfeldt, Steffen Shi, Shengyu Czarske, Jürgen Laboratory of Measurement and Sensor System Techniques Technische Universität Dresden Dresden01062 Germany Institute of Mechatronic Engineering TU Dresden Dresden Germany Key Laboratory of Polymer Processing Engineering of Ministry of Education National Engineering Research Center of Novel Equipment for Polymer Processing School of Mechanical and Automobile Engineering South China University of Technology Guangzhou510640 China

ISBN: (纸本)9780995775145

Vibrations of milling tools, especially of slender end mills, are one of the main contributors to shape deviations of machined work pieces in the milling process. For milling machines, the vibration behaviour depends on the spindle speed and end mill properties. Numerical models can help to predict vibrational behaviour and reduce vibrations. This requires measuring the frequency response of the end mill. We propose a system for investigating the frequency response function inside of a milling machine under different rotational speeds. It consists of an automated impact unit generating vibrations with a known force and a novel Mach-Zehnder interferometer based sensor. The sensor enables simultaneous axial distance and lateral velocity measurement at fast rotating surfaces with submicron uncertainty and measurement rates up to 50 kHz. The bidirectional vibration frequencies are estimated by the signal-processing algorithm depending on the geometric relationship of the displacement in two directions. © 2019 European Society for Precision engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Frequency response

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Trans-scale Nanofabrication with Nanopositioning and Nanomeasuring Machines

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IFAC-PapersOnLine 2019年第15期52卷 151-156页

作者： Andreas Meister Laura Weidenfeller Johannes Kirchner Martin Hofmann Rostyslav Mastylo Roland Füßl Johann Reger Eberhard Manske Institute for Process Measurement and Sensor Technology Technische Universität Ilmenau Germany Institute for Automation and Systems Engineering Technische Universität Ilmenau Germany Institute of Microelectronics and Nanoelectronics Technische Universität Ilmenau Germany

Nanofabrication in macroscopic working areas addresses the manipulation with nanometer precision in large scale working areas of several hundred millimeters. In order to reduce the fabrication time of large objects, high dynamic position tracking is required. The position and orientation of the nanopositioning and nanomeasuring machine have to be controlled permanently to compensate external disturbances like ground motion, sound waves, et cetera. Many applications have strict demands on following the track, e.g. to reduce the line roughness. High performant data and signal processing and efficient control algorithms are required to overcome these challenges. This work presents the nanopositioning and measuring machine as well as the utilized control system. Several scanning and fabrication experiments have been carried out in order to demonstrate the performance of the setup.

关键词： Precision Systems, Micro-/Nanosystems sensors measurement Systems

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Generating ideal reference geometry for cutting edges 22

Generating ideal reference geometry for cutting edges

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22nd World Congress of the International measurement Confederation, IMEKO 2018

作者： Karatas, Abdullah Seewig, Jörg University of Kaiserslautern Department of Mechanical and Process Engineering Institute for Measurement and Sensor-Technology Gottlieb-Daimler-Str. KaiserslauternD-67663 Germany

In the last years, many different techniques for rating cutting edges were presented. Nevertheless an automatic measurement and indication of quality from cutting edges was covered less attention. Although the state of cutting edges is very important in many cases during the manufacturing process. An automatic indication of quality can roughly be realised in three steps. The step, generating an ideal reference geometry from measured data, will be discussed in this paper. Therefore different types of splines and a robust filtering method is used. The other two steps, mainly measuring and estimating quantification parameters, were discussed in diverse sources. © 2018 institute of Physics Publishing. All rights reserved.

关键词： Geometry

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Approach for the observation of surface conditions in-process by soft sensors during cryogenic hard turning

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Procedia CIRP 2019年 81卷 1260-1265页

作者： Julian Uebel Felix Ströer Stephan Basten Werner Ankener Hendrik Hotz Lukas Heberger Gerhard Stelzer Benjamin Kirsch Marek Smaga Jörg Seewig Jan C. Aurich Tilmann Beck Institute for Measurement and Sensor-Technology Gottlieb-Daimler-Str. 44 67663 Kaiserslautern Germany Institute for Manufacturing Technology and Production Systems Gottlieb-Daimler-Str. 44 67663 Kaiserslautern Germany Institute of Materials Science and Engineering Gottlieb-Daimler-Str. 44 67663 Kaiserslautern Germany

Even though required for a robust production, direct measurement of the surface condition in-process is a challenge due to technical limitations. A concept for in-process monitoring of surface conditions like hardness or microtopography using observer-like structures will be discussed in this paper from a metrological point of view. Initially, the background regarding manufacturing and material sciences is summarized. Afterwards, the problem is analysed from a control engineering point of view and challenges and solutions are discussed. Finally, a concept for a new sensor, the opto-pneumatic scattered light sensor, is presented, which contributes to the indirect measurement of the microtophography in-process.

关键词： soft-sensor surface condition in-process indirect measurement opto-pneumatic scattered light sensor

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Electrolyte droplet spraying in H₂ bubbles during water electrolysis under normal and microgravity conditions

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Nature Communications 2025年第1期16卷 1-10页

作者： Bashkatov, Aleksandr Bürkle, Florian Demirkır, Çayan Ding, Wei Sanjay, Vatsal Babich, Alexander Yang, Xuegeng Mutschke, Gerd Czarske, Jürgen Lohse, Detlef Krug, Dominik Büttner, Lars Eckert, Kerstin Institute of Fluid Dynamics Helmholtz-Zentrum Dresden-Rossendorf Bautzner Landstrasse 400 Dresden 01328 Germany Physics of Fluids Group Max Planck Center for Complex Fluid Dynamics and J. M. Burgers Centre for Fluid Dynamics University of Twente P.O. Box 217 Enschede 7500AE Netherlands Institute of Aerodynamics RWTH Aachen University Wüllnerstraße 5a Aachen 52062 Germany Laboratory for Measurement and Sensor System Techniques Faculty of Electrical and Computer Engineering Technische Universität Dresden Helmholtzstr. 18 Dresden 01069 Germany Max Planck Institute for Dynamics and Self-Organization Am Fassberg 17 Göttingen 37077 Germany Institute of Process Engineering and Environmental Technology Technische Universität Dresden Dresden 01062 Germany

Electrolytically generated gas bubbles can significantly hamper the overall electrolysis efficiency. Therefore it is crucial to understand their dynamics in order to optimise water electrolyzer systems. Herein, we elucidate a distinct transport mechanism whereby electrolyte droplets are sprayed into H₂ bubbles. These droplets arise from the fragmentation of the Worthington jet, which is engendered by the coalescence with microbubbles. The robustness of this phenomenon is corroborated under both normal and microgravity conditions. Reminiscent of bursting bubbles on a liquid-gas interface, electrolyte spraying results in a flow inside the bubble. This flow couples, in an intriguing way, with the thermocapillary convection at the bubble’s surface, clearly underlining the high interfacial mobility. In the case of electrode-attached bubbles, the sprayed droplets form electrolyte puddles affecting the dynamics near the three-phase contact line and favoring bubble detachment from the electrode. The results of this work unravel important insights into the physico-chemical aspects of electrolytic gas bubbles, integral for optimizing gas-evolving electrochemical systems. © The Author(s) 2025.

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