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Contact stiffness determination of high-speed double- locking toolholder-spindle joint based on a macro- micro scale hybrid method

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Abstract

The stiffness of toolholder-spindle joint at high speeds plays an important role in the cutting efficiency and the machining accuracy. A double-locking toolholder (BTF type) is designed to improve the stiffness of joint. This paper presents a macro-micro scale hybrid method to determine the stiffness of double-locking toolholder-spindle joint at high speeds. In this method the finite element method and the three-dimensional fractal method are combined. It is assumed flat in macro-scale for the contact surfaces of joint. The finite element method is introduced to obtain the pressure distribution with the influence of centrifugal force at high speeds. In micro-scale, the contact surfaces are fractal featured and the three-dimensional fractal method is used to compute the stiffness based on the pressure. Experiments with BTF40-type toolholder are conducted to verify the efficiency of the proposed model in zero-speed case. The relationship between the stiffness and the technological parameters of the system can be derived based on the presented model. The upper limit of speed, the optimized range of each technological parameter are determined for obtaining the higher stiffness of joint. The results can provide theoretical basis for improving the cutting efficiency and the machining accuracy of high-speed machine tool.

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Abbreviations

a :

real contact area of a single asperity

al :

the real largest contact area of a single asperity

A r :

total real contact area

D :

three-dimensional fractal dimension

D s :

two-dimensional fractal dimension

E :

equivalent elastic modulus

E 1, E 2 :

elastic modulus of two surfaces

f :

normal load of a single asperity

F :

total normal load of contact surface

G :

fractal roughness parameter

G':

equivalent shear modulus

G 1, G 2 :

shear modulus of two surfaces

H :

hardness of the soft material

k :

coefficient related with the passion ratio

k n :

normal stiffness of a single asperity

k n :

total normal stiffness

k t :

total tangential stiffness

L :

sampling length

M :

asperity overlapping number of the joint surface topography

n :

frequency index

n max :

upper limit of frequency index

p :

normal load of a single asperity

r :

radius of the real contact region of a single asperity

R :

curvature radius

t :

tangential load of a single asperity

x, y :

planar Cartesian coordinates

Y :

yield stress of the soft material

δ:

normal deformation of a single asperity

δt :

tangential deformation of a single asperity

φm,n :

random phase

γ:

dimension parameter of the spectral density

v 1, v 2 :

Poisson ratio

µ:

static friction coefficient

τb :

shear strength of the soft material

ψ:

expand coefficient

':

truncated section of a single asperity

1c :

critical parameter demarcating the elastic and elastic-plastic regimes

2c :

critical parameter demarcating the elastic-plastic and plastic regimes

e :

parameter in the elastic regime

ep :

parameter in the elastic-plastic regime

p :

parameter in the plastic regime

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Correspondence to Yongsheng Zhao.

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Zhao, Y., Xu, J., Cai, L. et al. Contact stiffness determination of high-speed double- locking toolholder-spindle joint based on a macro- micro scale hybrid method. Int. J. Precis. Eng. Manuf. 17, 741–753 (2016). https://doi.org/10.1007/s12541-016-0092-y

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  • DOI: https://doi.org/10.1007/s12541-016-0092-y

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