New Methodology for Chatter Stability Analysis in Simultaneous Machining

2011 ◽  
pp. 1-22
Author(s):  
Nejat Olgac ◽  
Rifat Sipahi
Keyword(s):  
Stability Analysis ◽  
Chatter Stability

scholarly journals Chatter Stability Analysis of Milling Processes

PAMM ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Roman Binder ◽  
Katrin Ellermann ◽  
Harald Sehrschön
Keyword(s):  
Stability Analysis ◽  
Chatter Stability

Stability analysis in milling of thin-walled workpieces with emphasis on the structural effect

2009 ◽  
Vol 224 (4) ◽  
pp. 589-608 ◽  
Author(s):  
X-J Zhang ◽  
C-H Xiong ◽  
Y Ding ◽  
X-M Zhang
Keyword(s):  
Stability Analysis ◽  
Great Influence ◽  
Structural Effect ◽  
Experimental Results ◽  
Machining Parameters ◽  
Chatter Stability ◽  
Milling Stability ◽  
Thin Walled ◽  
Five Axis ◽  
Milling Chatter

Regenerative chatter easily occurs in milling and has become the common limitation to achieve good surface quality and high productivity. For the purpose of chatter avoidance, the structural effect of the thin-walled part should be considered for the milling chatter stability analysis for the optimization of axial cutting depth and spindle speed pairs. The main objective of this paper is to examine the link between the structural modes (i.e. modal shapes) and the chatter stability limits in the case of finish milling thin-walled workpieces. In this paper, the dynamic stability of the milling process of thin-walled workpieces is investigated through a two-degree-of-freedom mechanical model. The mathematical relationship between the critical axial depth and the thin-walled part modal shapes is deduced and an optimal calculation process of milling stability lobes is presented. Peripheral milling of aluminium alloy (2A70 Al) plates is carried out on a computer numerically controlled (CNC) five-axis super high-speed machining centre to validate the method. The experimental results agree with the prediction by the presented method. Additionally, the experimental results show that the cutting stability is also influenced by the modal frequencies of the thin-walled part, which have a great influence on the milling stability analysis when the tool passing frequency (i.e. the inverse of the tooth passing period) harmonics are close to the modal frequencies of the part. The presented method is effective in the prediction of milling chatter limits in the thin-walled case for the optimization of machining parameters.

scholarly journals Cutting force and chatter stability analysis for PKM-based helical milling operation

2020 ◽  
Vol 111 (11-12) ◽  
pp. 3207-3224
Author(s):  
Mengrui Shi ◽  
Xuda Qin ◽  
Hao Li ◽  
Shuai Shang ◽  
Yan Jin ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Cutting Force ◽  
Helical Milling ◽  
Chatter Stability ◽  
Milling Operation

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.

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