scholarly journals Chatter Stability Prediction in Milling Using Speed-varying Cutting Force Coefficients

Procedia CIRP ◽  
2014 ◽  
Vol 14 ◽  
pp. 170-175 ◽  
Author(s):  
N. Grossi ◽  
L. Sallese ◽  
A. Scippa ◽  
G. Campatelli
Keyword(s):  
Cutting Force ◽  
Stability Prediction ◽  
Chatter Stability ◽  
Cutting Force Coefficients ◽  
Force Coefficients ◽  
Chatter Stability Prediction

Chatter stability prediction of milling considering nonlinearities

2020 ◽  
pp. 095440542097107
Author(s):  
Yiqing Yang ◽  
Donghui Wu ◽  
Qiang Liu
Keyword(s):  
Cutting Force ◽  
Time Domain ◽  
Cutting Speed ◽  
Dissipated Energy ◽  
Stability Prediction ◽  
Chatter Stability ◽  
Process Damping ◽  
Stability Lobes ◽  
The Time Domain ◽  
Chatter Stability Prediction

Nonlinearities have been evidenced during the chatter vibration of milling. Machinability of the thin-walled part is feed rate and position-dependent, and is subject to process damping at low cutting speed. Therefore, chatter stability prediction of milling considering nonlinear cutting force, nonlinear structural stiffness and process damping is investigated. The cutting force and stiffness are established based on the polynomial model and the process damping is investigated based on the dissipated energy. The dynamic cutting force and stability lobes are solved in the time domain with coefficients updated at each iteration. By formulating the displacement as an expanded form via the perturbation method, the time-consuming solution of delay differential equations is avoided. After formulating the identification of the nonlinear model via cutting tests and modal tests, numerical simulations considering nonlinearities are carried out and compared with the analytical method. The proposed method attains high accuracy of classic time-domain solution, but with an improved computational efficiency. Finally, cutting tests are conducted to verify the prediction of cutting force and stability lobes.

Estimating Cutting Force Coefficients in High-Speed Low-Radial-Immersion Milling Processes

2014 ◽  
Author(s):  
Josiah A. Bryan ◽  
Roger C. Fales
Keyword(s):  
Stability Analysis ◽  
Cutting Force ◽  
High Speed ◽  
Milling Process ◽  
Model Parameters ◽  
Tool Deflection ◽  
Chatter Stability ◽  
Cutting Force Coefficients ◽  
Force Coefficients ◽  
Low Radial Immersion

A high-speed milling system is considered, which is prone to chatter vibration, a stability condition dependent on system parameters (e.g., cutting force coefficients). This work is motivated by the need for model parameters which can be used in stability analysis. An Extended Kalman Filter (EKF) is proposed to estimate cutting force coefficients for each tooth in a low-radial-immersion milling process to aid chatter stability prediction. The proposed EKF utilizes tool deflection measurements and no force measurements. The model used in the EKF is found to be observable, a quality required to achieve valid state estimations. Running the EKF with experimental tool deflection measurements produces estimates of cutting force coefficients that result in good correlation between simulation (using the estimated coefficients) and experiment. Such an EKF may help customize chatter stability analysis to any particular tool-workpiece system.

Mechanics and Dynamics of Multifunctional Tools

2015 ◽  
Vol 137 (1) ◽  
Author(s):  
Min Wan ◽  
Zekai Murat Kilic ◽  
Yusuf Altintas
Keyword(s):  
Time Domain ◽  
Prediction Models ◽  
Chip Thickness ◽  
Combined Processes ◽  
Multiple Delays ◽  
Stability Prediction ◽  
Chatter Stability ◽  
Regenerative Effect ◽  
Hole Making ◽  
Chatter Stability Prediction

The mechanics and dynamics of the combined processes are presented for multifunctional tools, which can drill, bore, and chamfer holes in one operation. The oblique cutting forces on each cutting edge with varying geometry are modeled first, followed by their transformations to tangential, radial, and axial directions of the cutter. The regenerative effect of lateral and torsional/axial vibrations is considered in predicting the dynamic chip thickness with multiple delays due to distribution of cutting edges on the cutter body. The lateral and torsional/axial chatter stability of the complete hole making operation is predicted in semidiscrete time domain. The proposed static cutting force and chatter stability prediction models are experimentally proven for two different multifunctional tools in drilling Aluminum Al7050 and Steel AISI1045.

Sign in / Sign up

Export Citation Format

Share Document