Abstract
The cutting process stability strongly depends on dynamics of the spindle-holder-tool system, which often changes and is determined by impact hammer testing in general. In order to avoid repeated and time-consuming impact hammer testing on different spindle-holder-tool combinations, this paper proposes a new method for three-dimensional dynamics prediction of spindle-holder-tool system. The system is modeled using Timoshenko’s beam theory and substructure synthesis method. The tool-holder connection is regarded as a double distributed joint interface model including a collet, a holder-collet joint interface and a tool-collet joint interface. The two joint interfaces are further modeled as two sets of independent spring-damper elements, while the collet and tool are modeled as Timoshenko beams with varying cross-sections. The substructure synthesis method is adopted to obtain the equation of motion of the spindle-holder-tool system. Finally, experiments of bending, torsional, and axial FRFs are carried out to verify the proposed method. Good agreements show that the new method is capable of predicting tool point FRFs more accurately compared with the existing methods.
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Abbreviations
- H H(ω):
-
Receptance matrix of the spindle-holder subassembly with angular frequency ω
- M c :
-
Mass matrix related to N c nodes of component c, where c = S,CorF
- C c :
-
Damping matrix related to N c nodes of component c, where c = S,C,F,HCorTC
- K c :
-
Stiffness matrix related to N c nodes of component c, where c = S,C,F,HCorTC
- Q c :
-
=[q c,1T,q c,2T,...,q c,N c T]TDesignates the displacement vector of component c corresponding to N c nodes with c = H,S,C,orF
- \(\mathbf {Q}_{{c}-\hat {c}}\) :
-
Displacement vector of nodes of component c which are in contact with component \(\hat {c}\) (c = S,C,F,HCorTC; \(\hat {c}=\textmd {H}, \textmd {S}, \textmd {C}, \textmd {F} \text {or} \textmd {TC}\) and \(\hat {c}\neq c\))
- q c,i :
-
= [u c,i ,v c,i ,w c,i ,𝜃 c,i ,ϕ c,i ,ψ c,i ]TDesignates the displacement vector of the i th node of component c, where u c,i , v c,i , w c,i , 𝜃 c,i , ϕ c,i and ψ c,i (c = H, S, C, or F) denote translational and rotational displacements of the i th node of component c related to X,Yand Zaxes
- \(\mathbf {F}_{{c-\hat {c}}}\) :
-
\(=[\mathbf {f}_{{c-\hat {c},1}}^{\textmd {T}}, \mathbf {f}_{{c-\hat {c},2}}^{\textmd {T}}, ... ,\mathbf {f}_{{c-\hat {c},} N_{c}}^{\textmd {T}}]^{\textmd {T}}\) Designates the load vector related to N c nodes of component c, and is applied by component \(\hat {c}\) (c = H,S,C,F,HCorTC; \(\hat {c}=\textmd {H}, \textmd {S}, \textmd {C}, \textmd {F}, \textmd {HC}\) or TCand \(\hat {c}\neq c\))
- \(\mathbf {f}_{{c-\hat {c}},i}\) :
-
\(=[f_{\textmd {x},c-\hat {c},i},f_{\textmd {y},c-\hat {c},i},f_{\textmd {z},c-\hat {c},i},M_{\textmd {x},c-\hat {c},i},M_{\textmd {y},c-\hat {c},i}, M_{\textmd {z},c-\hat {c},i}]^{\textmd {T}}\) Designates the load vector related to the i th node of component c, and is applied by component \(\hat {c}\), where \(f_{\textmd {x},c-\hat {c},i}\), \(f_{\textmd {y},c-\hat {c},i}\), \(f_{\textmd {z},c-\hat {c},i}\), \(M_{\textmd {x},c-\hat {c},i}\), \(M_{\textmd {y},c-\hat {c},i}\) and \(M_{\textmd {z},c-\hat {c},i}\) (c = H,S,Cor F; \(\hat {c}=\textmd {H}, \textmd {S}, \textmd {C}, \textmd {F}, \textmd {HC} \text {or} \textmd {TC}\), and \(\hat {c}\neq c\)) Denote the forces and torques acting on the i th node of component c corresponding to X,Y,and Zaxes, and are applied by component \(\hat {c}\)
- H:
-
spindle-holder subassembly
- C:
-
collet component
- S:
-
shank of tool component
- F:
-
fluted part of tool component
- TC:
-
tool-collet joint interface component
- HC:
-
holder-collet joint interface component
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Funding
This research has been supported by the National Natural Science Foundation of China (Grant Nos. 51705427, 11432011, and 51675440) and the Fundamental Research Funds for the Central Universities (Grant No. 3102017ZY006).
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Yang, Y., Wan, M., Ma, YC. et al. A new method using double distributed joint interface model for three-dimensional dynamics prediction of spindle-holder-tool system. Int J Adv Manuf Technol 95, 2729–2745 (2018). https://doi.org/10.1007/s00170-017-1394-7
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DOI: https://doi.org/10.1007/s00170-017-1394-7