Results 21 to 30 of about 3,846 (166)

Evaluation of quality parameters of conical profile compounds in nodes of multi-purpose machines [PDF]

E3S Web of Conferences, 2019
The article presents a study of the mandrel spindle assembly for accuracy, contact stiffness and strength. The study was made on the basis of conical profile connections with an equiaxed contour. Experiments were carried out for multi-purpose machines of
Il’inykh Viktor
doaj   +1 more source

Thermal-induced influences considered spindle unit angular contact ball bearing preload determination using embedded fiber Bragg gating sensors

International Journal of Distributed Sensor Networks, 2022
As the most important segment of the spindle unit angular contact ball bearing, the preload significantly influences the bearing characteristics. Thus, the thermal-induced preload derived from the thermal expansion of spindle unit components also affects
Yanfang Dong, Feifan Chen, Ming Qiu
doaj   +1 more source

Sensitivity analysis of rotating auxiliary components of a high-speed spindle shaft assembly [PDF]

The International Journal of Advanced Manufacturing Technology
Abstract Machine tool spindles, complex dynamic systems under thermal growth, are significantly influenced by the shaft assembly’s dimensions, including the spindle shaft and various press-fit auxiliary components. Despite the importance of these dimensions, their effects on the spindle’s dynamic and thermo-mechanical behavior have ...
Saif Ahmad Afridi, Esra Yuksel, Gilbert Rivera, Seong-Wook Hong, Erhan Budak   +4 more
openaire   +1 more source

Dynamic behavior of the horizontal milling and drilling machine spindle assembly with Dynrot software

MATEC Web of Conferences, 2017
This article presents research conducted to study the dynamic behavior of the assembly of a horizontal milling CNC machine spindle at the speed of 10 000 rpm and 50 000 rpm.
Căruţaşu Nicoleta Luminiţa, Pascu Nicoleta Elisabeta, Căruţaşu George   +2 more
doaj   +1 more source

Optimization of two support spindle shaft on nonlinear elastic supports by rigidity characteristics

Bulletin of the National Technical University «KhPI» Series: Dynamics and Strength of Machines, 2021
One of the main structural elements of metalworking machines is the spindle assembly (spindle), which is used to hold cutting tools or workpieces. The rigidity of the spindle assembly plays a decisive role in ensuring the accuracy and efficiency of the machine as a whole.
Sergij Yurijovich Pogorilov, Valerij Lvovich Khavin, Inna Petrovna Khavina   +2 more
openaire   +2 more sources

STUDY OF THE DYNAMICS OF SPINDLE SHAFT ON GAS-STATIC BEARINGS

Problems of Friction and Wear
This study delves into the complex dynamics of spindle shafts mounted on gas-static bearings, employing computational experiments and analysis to reveal crucial insights for optimizing high-precision machining processes. We identify natural frequencies and resonant tendencies of spindle vibrations through advanced Finite Element Method (FEM ...
Oleksii Breshev, Pavlo Nosko, Oleksandr Bashta, Alla Bashta, Maksym Radko   +4 more
openaire   +1 more source

Method for Vibration Response Simulation and Sensor Placement Optimization of a Machine Tool Spindle System with a Bearing Defect

Sensors, 2012
Bearing defects are one of the most important mechanical sources for vibration and noise generation in machine tool spindles. In this study, an integrated finite element (FE) model is proposed to predict the vibration responses of a spindle bearing ...
Hongrui Cao, Linkai Niu, Zhengjia He
doaj   +1 more source

Characterization of Dimensional Variations in Turning Process for Multistep Rotary Shaft of High-Speed Motorized Spindle

Machines, 2023
The surface accuracy of a multistep rotary shaft is very important in manufacturing and the assembly process of the high-speed motorized spindle of CNC machine tools, which is closely related to the machined dimensional variation induced by the turning ...
Ang Tian, Xueming Du, Shun Liu, Sun Jin
doaj   +1 more source

Experimental study on the lubrication characteristics of porous circular journal bearing under shaft unsteady condition (Examination into the whirling behavior of shaft at pivot supported condition by measuring the time history waveform of shaft with parameter of diametral clearance changes)

Nihon Kikai Gakkai ronbunshu, 2015
This report is described the study on the lubrication characteristics of porous circular journal bearing made with oil impregnate sintered materials as a DC spindle motor's bearing system.
Shigeru OHTSUKA, Masaki YAKABE, Takeshi GONDA, Hiroyuki YAMADA   +3 more
doaj   +1 more source

An Active Knee–Ankle–Foot Orthosis With Torque‐Dense, Low‐Impedance Knee Actuation

Advanced Intelligent Systems, EarlyView.
This article presents the simulation, design, and clinical validation of a robotic active KAFO with torque‐sensitive actuation. By passively and continuously adapting the transmission ratio in response to the knee torque, the torque‐sensitive actuator overcomes the tradeoff between torque, weight, and impedance observed in conventional robot actuators,
Brendon Ortolano, Kai Pruyn, Rosemarie Murray, Lukas Gabert, Tommaso Lenzi   +4 more
wiley   +1 more source