Dynamics prediction of spindle system using joint models of spindle tool holder and bearings

Xu, Chao; Zhang, Chenglong; Yu, Dingwen; Wu, Zhijun; Feng, Pingfa

doi:10.1177/0954406215569588

Cited by 18 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cutting or process forces cause axial forces, radial forces, torsional moments, and bending moments on the collet chuck holders, and as a consequence, displacements and inclinations of the clamping systems are produced [12,23,24].…”

Section: Determination Of the Loads On The Collet Contact Elementsmentioning

confidence: 99%

“…The relative strains in the contact elements or collet jaws of the collet chuck due to the bending moments caused by the process forces were analytically determined by means of Equation (26), and the parameters that intervene in the mentioned equation were calculated by means of the Equations ( 28)-(36).The total stiffness of the system, k rT , was determined as in the case of the influence of the centrifugal force [9,12,23,24], while the axial stiffness, k z , was determined using the finite element model widely described [3,8,12,22,23]. This model was also implemented in MATLAB, as shown in Figures 8-15.…”

Section: Strains Due To Bending Momentsmentioning

confidence: 99%

See 1 more Smart Citation

Mathematical Analysis of the Process Forces Effect on Collet Chuck Holders

et al. 2021

View full text Add to dashboard Cite

Chuck holders are widely used for jobs with high precision. A chuck holder consists of a nut with a tapered surface and a thin-slotted clamping sleeve typically made of hardened steel and named a collet. Chuck holders are, essentially, wedge mechanisms. In this paper, we investigated the reactions and strains due to the forces during the chip removal process in the contact elements or jaws of the collet by means of mathematical analysis. Deflections in the jaws of the collet arise with a high influence from the precision of the workpieces. The cutting or process forces cause an axial force, a radial force, a torsional moment, and a bending moment on the chuck collet, and, consequently, displacements and inclinations of the clamping system are caused. Therefore, the proposed analytical models are based on elasticity and contact theories. The mathematical model for determining the deflections of the clamping system force was developed and implemented using MATLAB. The results showed that the variation in the clamping force during rotation in a collet chuck holder mainly depends on the stiffness of the collet chuck holder and the stiffness of the workpiece. The results indicated that the collet should be vulcanized to minimize the deformations that affect the final product. The deflections of a collet chuck holder due to process forces depend strongly on the clearances, wedge angle, and stiffness of the collet.

show abstract

Section: Determination Of the Loads On The Collet Contact Elementsmentioning

confidence: 99%

Section: Strains Due To Bending Momentsmentioning

confidence: 99%

Mathematical Analysis of the Process Forces Effect on Collet Chuck Holders

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Similarly, using the finite element modeling the various interactions of the spindle tool system over the machine frame were analyzed to improve the dynamic stability of the system. [6][7][8][9] Aluminum alloys are easily machinable and at the same time, they lead to burrs on the machined surfaces with an improper selection of cutting tool material and other cutting conditions. The MRR is limited by the spindle power availability and/or by the occurrence of the instability of the cutting process leads to the chatter phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Investigation of chatter prediction in end milling using morphological studies on aluminum alloy (Al6061)

Shaik

Mutra

Galal

et al. 2022

Noise & Vibration Worldwide

View full text Add to dashboard Cite

Future machine tools have to be highly powerful systems to maintain the needed intellectual performance and stability. The machine tool systems such as Spindle/Tool-holder/Tool assembly are necessary to be optimized for their functionality or cutting performance to meet the productivity and accessibility requirements of the user. Prediction of the dynamic behavior at the spindle tool-tip is, therefore, an important criterion for assessing the machining stability of a machine tool at the design stage. In commercial practice, the machine tool system is extensively influenced by the dynamic rigidity of the spindle system. In this work, a realistic dynamic high-speed spindle/milling tool holder/tool system model is elaborated based on rotor dynamics predictions. Using the finite element modeling with the Timoshenko beam theory, the frequency response at the tool-tip has arrived initially. Further, the numerical model is validated with 3D ANSYS and experimental modal testing. The theoretical stability lobe diagram (SLD) depends on the stiffness and damping properties of the cutting tool and distinguishes the stable and unstable cutting conditions. The mechanism of chatter formation is investigated experimentally during the end milling of Aluminum alloy (Al6061) by two different techniques. Experimental cutting tests are conducted at different depths of cuts, the corresponding vibration signals and cutting samples are examined using the Scanning electronic microscope (SEM) and optical microscope. These studies provide a detailed investigation to predict the stable and unstable cutting zones at different machining conditions.

show abstract

“…The machining stability of a machine tool is not only affected by the dynamic characteristics of the spindle system but also by the dynamic characteristics of the ball screw feed drive. Most scholars focus on studying the dynamic characteristics of spindle system, 4–7 while only a few pay attention to the dynamics of the ball screw feed drive. However, with the increasingly enhanced requirements for the cutting performance of machine tools, the influence of the dynamic behavior of the full machine tool mechanical structure on the machining stability has become of major importance, 8,9 especially the ball screw feed drive.…”

Section: Introductionmentioning

confidence: 99%

Effect of the screw–nut joint stiffness on the position-dependent dynamics of a vertical ball screw feed system without counterweight

Zou

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The study on the position-dependent dynamic characteristics of a vertical ball screw feed system without counterweight is an important step in the enhancement of the structural performance of mini-type vertical milling machines. The ball screw is generally driven by a servomotor, which converts a rotary motion into a linear motion through a screw–nut pair. To assess the position-dependent dynamic characteristics of a vertical ball screw feed system subjected to the influence of the screw–nut joint stiffness, a variable-coefficient lumped parameter model of the system is developed. This model is established taking into account the screw–nut joint stiffness under three different strategies: (1) considering the preload and the weight of the spindle system, (2) considering the elastic deformation but ignoring the effect of the weight, and (3) a perfectly rigid model. The differences between the three models in predicting the position-dependent dynamic characteristics of the system are compared, revealing that the stiffness of screw–nut joint greatly affects the vibratory behavior of the spindle system in the transmission direction. A set of conducted experimental results demonstrate that the stiffness model under the preload and the weight of the spindle system is the most accurate model for the prediction of the position-dependent natural frequency and displacement response of the system with the spindle system position. Therefore, it is more suitable for structure design, performance simulation, and evaluation of a vertical ball screw feed system without counterweight.

show abstract

Dynamics prediction of spindle system using joint models of spindle tool holder and bearings

Cited by 18 publications

References 30 publications

Mathematical Analysis of the Process Forces Effect on Collet Chuck Holders

Mathematical Analysis of the Process Forces Effect on Collet Chuck Holders

Investigation of chatter prediction in end milling using morphological studies on aluminum alloy (Al6061)

Effect of the screw–nut joint stiffness on the position-dependent dynamics of a vertical ball screw feed system without counterweight

Contact Info

Product

Resources

About