Autor: Friedrich, Christian - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Spatial compliance measurement of a clamping table with integrated force sensors
Autorzy:: Friedrich, Christian
Ihlenfeldt, Steffen
Powiązania:: https://bibliotekanauki.pl/articles/2052192.pdf
Data publikacji:: 2022
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
parallel kinematics
force measurement
sensor integration
Opis:: Force sensor integration into machine components is a promising approach to measure spatial process forces, especially, when regarding hexapod structures and kinematics. Rigid still-standing hexapod frameworks, such as clamping tables, are particular suitable for this approach, as no dynamic influences need to be taken into account within the measurement model and they allow a measurement in 6 degrees of freedom. On the other hand, the stiffness of rigid frameworks is reduced by force sensor integration significantly. In addition, many approaches apply joints or flexure hinges to reduced lateral forces and improve the measuring quality, which reduce the stiffness even more. In this contribution, the compliance of a clamping table with integrated force sensors and flexure hinges is determined by experimental measurements using a multiline laser interferometer, by analytic calculation, and by finite element simulation. In conclusion, the amount of stiffness reduction by force sensors and flexure hinges is quantified and different methods for compliance determination are compared.
Źródło:: Journal of Machine Engineering; 2022, 22, 1; 70-83
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Stiffness evaluation of a hexapod machine tool with integrated force sensors
Autorzy:: Friedrich, Christian
Kauschinger, Bernd
Ihlenfeldt, Steffen
Powiązania:: https://bibliotekanauki.pl/articles/99529.pdf
Data publikacji:: 2020
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tools
parallel kinematics
force measurement
sensors integration
Opis:: Today, in-process force measurement is required by many manufacturing applications, such as process monitoring, quality assurance, or adaptive process control. A very promising force measurement approach bases on sensor-integration into the machine structure and is particularly suitable for hexapod structures and kinematics, where it allows a measurement in 6 degrees of freedom. On the other hand, a sensor integration also affects the machine. Especially for strain-gauge-based force sensors, a stiffness reduction is predicted, as their measuring principle requires a deformation. The practical consequences of these influences are investigated in this contribution. In particular, this work presents extensive experimental studies of the stiffness change caused by sensor integration for a single hexapod strut as well as for the complete hexapod machine tool. The results are evaluated in comparison to compliances of other components, such as the kinematic joints, and to stiffness changes resulting from sensor-integration into the end-effector or the application of a commercial force/torque sensor at the end-effector. In conclusion, the studies support the approach of structure-integrated force measurement for parallel kinematics, as the stiffness loss is rather small in many cases.
Źródło:: Journal of Machine Engineering; 2020, 20, 1; 58-69
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Fast evaluation of the volumetric motion accuracy of multi-axis machine tools using a Double-Ballbar
Autorzy:: Kauschinger, Bernd
Friedrich, Christian
Zhou, Ruiqing
Ihlenfeldt, Steffen
Powiązania:: https://bibliotekanauki.pl/articles/99999.pdf
Data publikacji:: 2020
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: Double-Ballbar
fast performance test
volumetric motion accuracy
multi-axis machine tools
Opis:: The proof of manufacturing accuracy requires continuous verification and crosscheck of the motion accuracy of machine tools. Machining in 5 to 6 axes intensifies the problem of measurement and evaluation of volumetric motion accuracy in up to 6 degrees of freedom (DOF) in the whole workspace. Although, there are many known, even standardized, measuring methods, they are either expensive, time-consuming, not applicable in an operational state of the machine under shop floor conditions, or their significance is limited to only 1 or 2 feed-axes. Appropriate methods to be run regularly, fast and cost-efficient by the machine operator as a performance test are still desired. The article presents a new approach that meets these requirements. It is based on a Double-Ballbar (DBB) with enlarged measuring range and volumetric measuring paths of up to 6 DOF with all feed-axes moving simultaneously during continuous measurement, instead of plane circular paths according to ISO 230-4. After an explanation of the proposed method, the developed DBB device is introduced, including its mechanical and sensor design, the data interface, and results of experimental investigations on the measuring accuracy. Furthermore, relevant problems regarding the design, optimization, and programming of appropriate 6 DOF measuring paths are discussed and experimental results are presented that show the advantage compared to other measuring paths.
Źródło:: Journal of Machine Engineering; 2020, 20, 3; 44-62
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Accuracy assessment of articulated industrial robots using the Extended- and the Loaded-Double-Ball-Bar
Autorzy:: Marwitz, Johann August
Theissen, Nikolas Alexander
Gonzalez, Monica Katherine
Friedrich, Christian
Hellmich, Arvid
Archenti, Andreas
Ihlenfeldt, Steffen
Powiązania:: https://bibliotekanauki.pl/articles/2086277.pdf
Data publikacji:: 2022
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: machine tool
robotics
double ball bar
geometric accuracy
static accuracy
Opis:: This research paper outlines the methodology and application of geometric and static accuracy assessment of articulated industrial robots using the Extended Double Ball Bar (EDBB) as well as the Loaded Double Ball Bar (LDBB). In a first experiment, the EDBB is used to assess the geometric accuracy of a Comau NJ-130 robot. Advanced measuring trajectories are investigated that regard poses or axes configurations, which maximize the error influences of individual robot components, and, in this manner, increase the sensitivity for a large number of individual error parameters. The developed error-sensitive trajectories are validated in experimental studies and compared to the circular trajectories according to ISO 203-4. Next, the LDBB is used to assess an ABB IRB6700 manipulator under quasi-static loads of up to 600 Newton using circular testing according to ISO 230-4. The stiffness is identified from the loaded circular trajectories. Then, the stiffness is used to perform a reverse calculation to identify the kinematic errors on the path deviations. The concept is validated in a case study of quasi-static loaded circular testing using the LDBB compared to a Leica AT960 laser tracker (LT).
Źródło:: Journal of Machine Engineering; 2022, 22, 2; 80--98
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Avoidance of drill cap formation in CFRP-titanium stack materials by using vibration assisted drilling with defined coupling of the oscillation
Autorzy:: Krall, Stephan
Prießnitz, Markus
Baumann, Christian
Brandt, Peter
Bleicher, Friedrich
Powiązania:: https://bibliotekanauki.pl/articles/24084653.pdf
Data publikacji:: 2023
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: drilling
burr
tool geometry
clean drilling
one shot drilling
vibration assisted drilling
Opis:: Drilling of rivet holes in stacked materials consisting of CFRP and Ti-6Al-4V still represents unique challenges. It is common practice to drill the material layers using one single tool. When exiting the final metallic layer, formation of a drill cap usually leads to undesirable burrs and debris, requiring manual post-processing. In this work, a drilling process to avoid drill caps is presented. This is realized using low frequency high amplitude vibration assisted drilling with defined coupling of the rotational speed and the axial oscillations. Drilling parameters and their impact on the quality of the drilled hole in the metallic layer are also investigated. It is found that drill tip geometries and process parameters need to be tuned together to achieve a stable and repeatable process for drill cap avoidance. A highly sensorized experimental setup with multi-sensor systems including high-speed and thermal imaging was used for process evaluation.
Źródło:: Journal of Machine Engineering; 2023, 23, 2; 77--99
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Investigation of multilayer coating of EN AW 6060 – T66 using friction surfacing
Autorzy:: Krall, Stephan
Baumann, Christian
Agiwal, Hemant
Bleicher, Friedrich
Pfefferkorn, Frank
Powiązania:: https://bibliotekanauki.pl/articles/2142351.pdf
Data publikacji:: 2022
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: additive manufacturing
friction surfacing
aluminum-silicon alloy
coating
Opis:: The objective of this research is to investigate observable process changes during multi-layer friction surfacing of EN AW 6060 aluminum, whether for repair, remanufacturing, or new part manufacturing. In this study, friction surfacing was performed with a 10-mm-diameter rod of EN AW 6060 aluminum at spindle speeds ranging from 1000 to 7000 rpm to create up to three layers of 40-mm-long deposits on a substrate of the same alloy. The process forces and layer temperatures were observed. Post-process measurement of flash geometry, layer geometry and microhardness were conducted with the motivation to understand the impact of multi-layer depositions on performance and identifying acceptable conditions required to achieve acceptable build quality. The thickness, deposition and joining efficiency of layers in the multilayer configuration remained consistent. Friction surfacing of EN AW 6060 aluminum allowed for high deposition rates of 9 kg/hr, when compared to other metal additive technologies.
Źródło:: Journal of Machine Engineering; 2022, 22, 3; 44--58
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: De-Kulturation und Germanisierung : die nationalsozialistische Rassen- und Erziehungspolitik in Polen 1939-1945
Autorzy:: Harten, Hans-Christian.
Współwytwórcy:: Scholz, Stephan. Recenzja
Friedrich, Klaus-Peter. Recenzja
Data publikacji:: 1996
Wydawca:: Frankfurt am Main : Campus Verlag
Dostawca treści:: Bibliografia CBW

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Skocz do pozycji: 8.

Tytuł:: Multiaxial force platform with disturbance compensation for machine tools
Autorzy:: Palalic, Marijana
Möhring, Hans-Christian
Maier, Walther
de Mendoza, Adrian Gonzalez
Riemeier, Friedrich
Powiązania:: https://bibliotekanauki.pl/articles/99882.pdf
Data publikacji:: 2020
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: force determination platform
disturbance-resistant
FEA
multibody system
Opis:: As part of a cooperation project between the Institute for Machine Tools, Stuttgart, Germany, and EMO Systems/Nuton GmbH, Berlin, Germany, a prototype of a multiaxial force platform with disturbance compensation for the measurement of the cutting forces in machine tools was developed. Commercially available products based on piezoelectric technology are subject to a degree of measurement uncertainty and therefore characterized by various disturbances. Interpreting measurement data of the commercially available products is complex, time-consuming and prone to errors. This paper describes the mechanical design and the simulation of the multiaxial force measuring system with the finite element method (FEM) as well as the conceptual development of a reduced model for a multibody simulation with the purpose of implementing a compensation algorithm. The measurement uncertainty was reduced by using appropriate hardware and software for the compensation of the various disturbances so that the application of the force platform would also be possible in the industrial application for the process diagnosis, the control and the regulation in machine tools. Systems based on strain gauge technology have some advantages in the field of zero-point stability and also provide a less expensive solution. For the disturbance compensation, an additional force and torque sensor system with eight channels was used for the detection of the platform displacement and inclination. With the help of appropriate algorithms for the disturbance compensation and their integration in the evaluation software, the disturbances could be reduced to a minimum.
Źródło:: Journal of Machine Engineering; 2020, 20, 3; 5-16
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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