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Mechanics and dynamics of the tool holder-spindle interface Namazi, Mehdi
Abstract
This thesis presents a general method for identifying and modeling the tool holderspindle interface in machine tools, using an experimental technique and the finite element method. The spindle assembly is one of the weakest parts in the machine tool and contributes to the chatter vibrations. The unwanted vibrations lead to a poor surface finish and can damage the tool, tool holder and spindle bearings. The tool holder-spindle interface is the connection closest to the cutting, and its dynamics can affect the stability of the cutting process and the dimensional accuracy of the work-piece. In this thesis, Timoshenko beam elements are used to model the tool holder, and an experimental setup is used to identify the contact stiffness of the interface for CAT and the HSK tapers. The finite-element models of the tool holder and the spindle are coupled through a receptance coupling model. The effect of the drawbar force is investigated as the main factor affecting the dynamics of the interface. It is shown that with an increase in the drawbar force, the dynamic stiffness of the connection between the holder and spindle taper decreases and saturates after a certain force level. The dynamics of various tool holder types is also investigated in the setup as a guideline to select tool holders for lowspeed and high-speed milling operations. This thesis also presents the coupling of tool holder dynamics identified through the finite element method with the experimentally identified spindle. The structural dynamics of the spindle with a tool-holder taper is identified experimentally through an inverse receptance coupling technique. The tool holder stick-out and tool are assumed to be a lightly damped linear structure, and its analytically predicted dynamics is coupled to the spindle with the aid of a receptance coupling method. This approach greatly reduces the number of impact modal tests needed to identify the dynamics of the machine at the tool tip after each tool change. The dynamics of the machine tool and the properties of the work-piece material are used to calculate chatter stability lobes. The proposed method is applied on a horizontal machining center and verified experimentally.
Item Metadata
Title |
Mechanics and dynamics of the tool holder-spindle interface
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2006
|
Description |
This thesis presents a general method for identifying and modeling the tool holderspindle
interface in machine tools, using an experimental technique and the finite element
method.
The spindle assembly is one of the weakest parts in the machine tool and contributes to
the chatter vibrations. The unwanted vibrations lead to a poor surface finish and can damage
the tool, tool holder and spindle bearings. The tool holder-spindle interface is the connection
closest to the cutting, and its dynamics can affect the stability of the cutting process and the
dimensional accuracy of the work-piece. In this thesis, Timoshenko beam elements are used
to model the tool holder, and an experimental setup is used to identify the contact stiffness of
the interface for CAT and the HSK tapers. The finite-element models of the tool holder and
the spindle are coupled through a receptance coupling model. The effect of the drawbar force
is investigated as the main factor affecting the dynamics of the interface. It is shown that with
an increase in the drawbar force, the dynamic stiffness of the connection between the holder
and spindle taper decreases and saturates after a certain force level. The dynamics of various
tool holder types is also investigated in the setup as a guideline to select tool holders for lowspeed
and high-speed milling operations.
This thesis also presents the coupling of tool holder dynamics identified through the
finite element method with the experimentally identified spindle. The structural dynamics of
the spindle with a tool-holder taper is identified experimentally through an inverse receptance
coupling technique. The tool holder stick-out and tool are assumed to be a lightly damped
linear structure, and its analytically predicted dynamics is coupled to the spindle with the aid
of a receptance coupling method. This approach greatly reduces the number of impact modal
tests needed to identify the dynamics of the machine at the tool tip after each tool change.
The dynamics of the machine tool and the properties of the work-piece material are used to
calculate chatter stability lobes. The proposed method is applied on a horizontal machining
center and verified experimentally.
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Genre | |
Type | |
Language |
eng
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Date Available |
2010-01-08
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0080735
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2006-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.