variation of the dynamic characteristics of a spindle with

STATIC AND DYNAMIC ANALYSIS OF A CNC MILLING SPINDLE

Abstract - The spindle is the one of important components in the Milling machine of which static and dynamic characteristics is directly related to the machining operation precision stability The performance of spindle system directly affects the overall machine specification Static and Dynamic

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CiteSeerX - Document Details (Isaac Councill Lee Giles Pradeep Teregowda): Abstract—This paper presents the variation of the dynamic characteristics of a spindle with the change of bearing preload The correlations between the variation of bearing preload and fundamental modal parameters were first examined by conducting vibration tests on physical spindle units

A dynamic modeling approach for the winding spindle during

Secondly a fully dynamic model of the polyester winding spindle system which consists of the cantilever supporting arm shaft and sleeve as well as the flexible and rigid coupling elements was established Thirdly the Newmark method was used to develop a program for solving the dynamic equations of the spindle system in MATLAB

A prediction model of the surface topography due to the

In order to study the surface topography influenced by the unbalance of the spindle system the spindle system is simplified and the dynamic model is shown in Figure 4 In the figure the shaft is assumed as rigid because the variation of the shaft material is very small relative to the gas film in the bearing clearance

An analytical method to select spindle speed variation

Regenerative chatter vibrations may result in shortened tool life and poor surface finish and hence should be avoided in practice Since the Spindle Speed Variation (SSV) method has been certified as a feasible and effective way the issue of speed variation parameters selection has yet to be solved Based on the discussions of energy accumulation process in chatter and in

High Speed Spindle Design and Construction

The spindle shaft is held in position by a set of high precision bearings The bearings require a lubrication method such as grease or oil The spindle shaft then will rotate up to the maximum speed and exhibit the power characteristics of the motor type that is used

Analysis of dynamic characteristics of a HDD spindle

This paper presents a method to investigate the characteristics of a ball bearing and the dynamics of a HDD spindle system due to temperature variation Finite element model is developed for the rotating and stationary parts of a HDD spindle system separately to determine their thermal deformations by using ANSYS a finite element program Then the relative

Dynamic modeling of ultra

The dynamic characteristics of the machine tool were found to be in good accordance with the experimental results Moreover the field ambient vibration was tested and then the power spectrum of the ground vibration was obtained according to the data measured Based on the veri fied dynamic model the dynamic response of a tool tip under

Analysis of aerostatic spindle radial vibration error

Zhang SJ To S Wang HT (2013) A theoretical and experimental investigation into five-DOF dynamic characteristics of an aerostatic bearing spindle in ultra-precision diamond turning International Journal of Machine Tools and Manufacture 71: 1 – 10

Online Dynamic Balance Technology for High Speed Spindle

proposed using influence coefficients of the standard model when the dynamic characteristics of a rotor system changed [9] In 2006 a gain scheduling control method using influence coefficients of the reference model was proved effective by J D Moon et al in balancing the spindle system although its characteristics were changed

Study of the thermal influence on the dynamic

High speed motorized spindle has great influence on the overall technical performance of the machine tools and the main factor that affects the dynamic characteristics and the dynamic accuracy of the motorized spindle is the severe internal heat generation [1 2] Therefore in order to study the thermal influence on the modal characteristics

Numerical analysis of dynamic characteristics in the ultra

In this paper the dynamic characteristics of ultra-high speed grinding spindle system is analyzed by using digital analysis methods The spindle system is the key components of the machine tool and its performance directly determines the machining stability and accuracy Liquid hybrid bearing with its superior performance has been widely applied to high speed and heavy

An analytical method to select spindle speed variation

Regenerative chatter vibrations may result in shortened tool life and poor surface finish and hence should be avoided in practice Since the Spindle Speed Variation (SSV) method has been certified as a feasible and effective way the issue of speed variation parameters selection has yet to be solved Based on the discussions of energy accumulation process in chatter and in

Dynamic characteristics of spindle with water

May 01 2020The small variation in the cutting force affects a spindle motion that depends on the dynamic characteristics of the spindle The resultant spindle motion due to the time variance cutting force affects a quality of the finished surface

Influence of spindle condition on the dynamic behavior

logical since the major design characteristics of the spindle such as the shaft dimensions and the bearing types and positions remain identical over time However interesting and non-negligible variations of the dynamic behavior can be observed Larger deviations are obtained between reassemblies of the

DESIGN AND ANALYSIS OF HIGH SPEED MOTORIZED SPINDLE

The variation regularity of its temperature-rise and temperature field is also summarized its dynamic characteristics in theory with an eye to high-speed rotational effects including centrifugal forces and thermo-mechanical-dynamic spindle behaviors at high speeds The integrated model to characterize mechanical

Rotor Dynamic Response of a High

spindle-holder-tool dynamic stiffness as reflected at the tool's free end Because this dynamic stiffness can vary with rotating frequency we have modeled the spindle dynamic response using a finite element-based rotordynamics approach The spindle shaft is modeled using beam finite elements with four degrees-of-freedom at each node

The nonlinear stability prediction and FEM modeling of

Jan 01 2014Spindle-holder-tool joints are other significant factors in influencing the high-speed spindle system dynamic characteristics besides spindle-bearing joint Rivin [4] has proposed the six important aspects of machining tool research in which the joint structure and dynamic related study will become of emphasis in the future

QUANTITATIVE FEEDBACK THEORY

techniques which are stability boundary for dynamics characteristics The main goal of modelling for a spindle of lathe machine is to achieve an accurate model representing the actual system behaviour It is important to recognise the moving nature and dynamic characteristics of the system and construct a suitable mathematical framework

Effect of bearing preload on the dynamic characteristics

The finite element dynamic analysis model of the spindle assembly was developed by taking the advantage of the spring-damper elements to simulate the bearing supports Finite element analysis (FEA) was conducted to evaluate the effect of the preload on the dynamic characteristics of the spindle-bearing system

Online Dynamic Balance Technology for High Speed Spindle

proposed using influence coefficients of the standard model when the dynamic characteristics of a rotor system changed [9] In 2006 a gain scheduling control method using influence coefficients of the reference model was proved effective by J D Moon et al in balancing the spindle system although its characteristics were changed

Effect of bearing preload on the dynamic characteristics

The finite element dynamic analysis model of the spindle assembly was developed by taking the advantage of the spring-damper elements to simulate the bearing supports Finite element analysis (FEA) was conducted to evaluate the effect of the preload on the dynamic characteristics of the spindle-bearing system

Dynamic characteristics of ultra

Mar 13 2013The commercial CFD software ANSYS-Fluent is adopted to numerically study the dynamic characteristics of the aerostatic bearing According to symmetry of the geometry and boundary conditions only 1/8 of the 3D air flow field in the aerostatic bearing is considered and the computational meshes are shown in Fig 2 There are totally 135 510 hexahedral control

On the stability of high

In this section the relevant parameters of the spindle speed variation are defined and the mechanical model of the milling process is presented 2 1 Variation of the spindle speed In this paper periodic spindle speed variation is considered i e the spindle speed is modulated periodically around a mean value by a given amplitude and

Effect of the Bearing Preload on the Characteristics of

The main objective of this study is to investigate the effect of bearing preloads on the characteristics of spindle stiffness Finite element model for spindle-bearing system is established enabling the variation of spindle stiffness calculations under different bearing preloads On the other hand the spindle stiffness may also be obtained from the experiment