investigation of spindle bearing preload on dynamics

Modeling of high

Bearing stiffness which varies as a function of the preload cutting force and spindle speed is the fundamental nonlinearity in the dynamics of high-speed spindles A nonlinear finite element model of the angular contact ball bearing is formulated by considering both centrifugal forces and gyroscopic moments from the rolling elements of the

Entropy

The initial preload enhances accuracy in rotation determines the stiffness and lifespan of the spindle and helps to decrease noise and vibration Two methods have been developed for the adjustment of bearing preload: (1) constant position preload and (2) constant force preload (spring preload)

Investigation of spindle bearing preload on dynamics

Investigation of spindle bearing preload on dynamics and stability limit in milling By UK ( host institution ) University of Sheffield AMRC with Boeing E ( author ) Ozturk U ( UF author ) Kumar S ( author ) Turner and T ( author ) Schmitz

2017-3-16Dynamic design of a high speed motorized spindle-bearing system Journal of Mechanical Design Transactions of ASME 2010 ( 131 ) 034501-1 - 034501-5 [27] Shuyun Jiang Shufei Zheng A modeling approach for analysis and improvement of spindle-drawbar-bearing assembly dynamics

A comparative study on the dynamics of high speed

This paper presents the effects of bearing preload mechanisms on the dynamic performance of high speed spindles The comparisons of two main types of bearing preload—"constant" and "rigid"—mechanisms are provided using a mathematical model as well as experiments Based on the Timoshenko beam element theory coupled with a nonlinear model of angular contact ball bearings the

Investigation of spindle bearing preload on dynamics

2012-1-1This paper presents the effect of bearing preload on the spindle and tool tip FRFs The relationship between preload and spindle speed on the tested spindle is provided Due to the automatic variation in preload with the spindle speed by the hydraulic preload adjustment system the tool tip FRF is spindle speed dependent

2020-4-24[18] NAKAJIMA K Thermal contact resistance between balls and rings of a bearing under axial radial and combined loads [J] Journal of thermophysics and heat transfer 1995 9(1): 88-95. [19] JIANG S MAO H Investigation of variable optimum preload for a machine tool spindle[J]

Uttara Vijay Kumar

Investigation of spindle bearing preload on dynamics and stability limit in milling CIRP Annals-Manufacturing Technology 31 Dezember 2012 Andere Autoren Spindle dynamics identification for Receptance Coupling Substructure Analysis Precision Engineering 31 Januar 2012 Andere Autoren

Entropy

The initial preload enhances accuracy in rotation determines the stiffness and lifespan of the spindle and helps to decrease noise and vibration Two methods have been developed for the adjustment of bearing preload: (1) constant position preload and (2) constant force preload (spring preload)

Schedule

Application-dependent bearing preload in planetary gear units – application design and assembly Measuring the kinematic behavior of spindle bearing rolling elements under radial loads Investigations on the rolling bearing cage dynamics with regard to different operating conditions and cage properties

Thermal Behavior of Externally Driven Spindle

2015-3-5This paper focuses on model development for computer analysis of the thermal behavior of an externally driven spindle The aim of the developed model is to enable efficient quantitative estimation of the thermal characteristics of the main spindle unit in an early stage of the development process The presented work includes an experimental validation of the simulation model using a custom

CIRP Annals

2016-2-192 Effect of preload 2 1 On spindle dynamics To identify the spindle-machine dynamics under variable preload astandardartifact (i e tool holder with uniform cylindrical geometry beyond the flange) was inserted in the spindle for each preloadsetting The settings were changed manually via the CNC controller The zero speed direct

COMPLEX THERMO

Abstract: The article treats a main spindle-bearing assembly that operates at high speeds from the perspective of complex modeling The simulation of the dynamic and thermo-mechanical behavior is considered Some important contributions are highlighted regarding the complex simulation of the main spindle

A General Method for the Modeling of Spindle

The spindle shaft and housing are modeled as Timoshenko's beam by including the centrifugal force and gyroscopic effects The bearing is modeled as a standard nonlinear finite element based on Jones' bearing model that includes the centrifugal force and gyroscopic effects from the rolling elements of

Investigation of spindle bearing preload on dynamics

Many spindle designs offer automatic speed-dependent preload adjustments to improve the bearing service life This can result in spindle speed-dependent dynamic properties at the tool tip and errors in process stability predictions In order to improve stability prediction accuracy for a representative tool and tool holder assembly the tool tip frequency response functions are measured for

An Investigation of Contact Angles in Angular Contact

The governing equations of the bearing amount to the solution of a set of nonlinear equations for each rolling element at each iteration which represents a tedious and expensive solution In this work a simplified model for angular contact ball bearings under the action of arbitrary loading including high speed effects and preload is presented

The latest preload technology of machine tool

2017-11-11Recently the studies of machine tool spindles for high-speed and high-precision have been actively performed to produce high-valueadded products The spindle has a great influence on the performance of the machine tool In particular the preload method and the amount of preload applied to the bearings inside the spindle are properly determined to maintain high performance of the spindle

Sensors

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 system with localized bearing defects and then the sensor placement for better detection of bearing faults is optimized

Dynamic design for motorized spindles based on an

Therefore the final equations of motion of the spindle-bearing system should Where {X} is the global node displacement of the spindle- bearing system in rotational frame coordinates M C and K be expressed as follows: s s s Table 3 Parameters of r /Ω 0 11 r /Ω 0 21 r /Ω 21 3 e/μm1 6897 R /mm 40 7 1 2 em g 170MD15Y20 type motorized

Receptance Coupling Substructure Analysis

The Receptance Coupling Substructure Analysis (RCSA) approach analytically predicts the tool-holder-spindle-machine assembly frequency response by joining models and measurements of the individual components through appropriate connection parameters

2020-4-24[18] NAKAJIMA K Thermal contact resistance between balls and rings of a bearing under axial radial and combined loads [J] Journal of thermophysics and heat transfer 1995 9(1): 88-95. [19] JIANG S MAO H Investigation of variable optimum preload for a machine tool spindle[J]

A hybrid method for dynamic stiffness identification

Bearing joint dynamic parameter identification is crucial in modeling the high speed spindles for machining centers used to predict the stability and natural frequencies of high speed spindles In this paper a hybrid method is proposed to identify the dynamic stiffness of bearing joint for the high speed spindles The hybrid method refers to the analytical approach and experimental method

Investigation of the position error signal of an operating

2016-12-27analysis model Finite element models of the spindle motor and VCM of the electromagnetic fields had 8 784 and 3 388 triangular elements respectively The FDBs consist of a thrust bearing and two journal bearings which had an axial preload of 0 79 N generated by the thrust yoke due to the axial misalignment of the permanent magnet and stator

Schedule

Application-dependent bearing preload in planetary gear units – application design and assembly Measuring the kinematic behavior of spindle bearing rolling elements under radial loads Investigations on the rolling bearing cage dynamics with regard to different operating conditions and cage properties

Investigation of spindle bearing preload on dynamics

Investigation of spindle bearing preload on dynamics and stability limit in milling By UK ( host institution ) University of Sheffield AMRC with Boeing E ( author ) Ozturk U ( UF author ) Kumar S ( author ) Turner and T ( author ) Schmitz

An Investigation of Contact Angles in Angular Contact

The governing equations of the bearing amount to the solution of a set of nonlinear equations for each rolling element at each iteration which represents a tedious and expensive solution In this work a simplified model for angular contact ball bearings under the action of arbitrary loading including high speed effects and preload is presented

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2015-6-29Shuyun Jiang Hebing Mao Investigation of variable optimum preload for a machine tool spindle International Journal of Machine Tools and Manufacture 2010(50):19-28 (SCI、EI) Shuyun Jiang Yunjian Zheng Analytical model of thermal contact resistance based on Weierstrass-Mandelbrot (W-M) fractal function

Estimation for Bearing Preload of Machine Tool

The bearing preload of machine tool spindle was estimated according to the change of ball bearing frequencies Experiments were carried out in a spindle bearing test rig to verify the validity of the presented analytical method The method described in this paper can achieve the estimation for bearing preload of machine tool spindle