Modeling and experimental analysis of microburr formation considering tool edge radius and tool-tip breakage in microend milling

2009 ◽  
Vol 27 (3) ◽  
pp. 1531 ◽  
Author(s):  
Y. C. Liang ◽  
K. Yang ◽  
Q. S. Bai ◽  
J. X. Chen ◽  
B. Wang
Keyword(s):  
Experimental Analysis ◽  
Tool Edge Radius ◽  
Edge Radius ◽  
Tool Edge ◽  
Microend Milling

Simulation of Meso-Scale Machining of AISI1045 Based on Multiphase Model

2016 ◽  
Vol 836-837 ◽  
pp. 374-380
Author(s):  
Teng Yi Shang ◽  
Li Jing Xie ◽  
Xiao Lei Chen ◽  
Yu Qin ◽  
Tie Fu
Keyword(s):  
Cutting Force ◽  
Cutting Process ◽  
Multiphase Model ◽  
Tool Edge Radius ◽  
Edge Radius ◽  
Tool Edge ◽  
Cutting Insert ◽  
Multiphase Models ◽  
Hot Rolled ◽  
Meso Scale

In the meso-scale machining, feed rate, grain size and tool edge radius are in the same order of magnitude, and cutting process is often carried out in the grain interior and grain boundary. In this paper the meso-cutting process of hot-rolled AISI1045 steel is studied and its metallographic microstructure is analyzed for the establishment of multiphase models which incorporate the effect of ferrite and pearlite grains. In order to discover the applicability of multiphase models to the simulation of meso-cutting, three contrast simulation models including multiphase model with rounded-edge cutting insert (model I), multiphase model with sharp edge cutting insert (model II) and equivalent homogeneous material model with rounded-edge cutting insert (model III) are built up for the meso-orthogonal cutting processes of hot-rolled AISI1045. By comparison with the experiments in terms of chip morphology, cutting force and specific cutting force, the most suitable model is identified. Then the stress distiribution is analyzed. And it is found that multiphase model with tool edge radius can give a more accurate prediction of the global variables and reveal more about these important local variables distribution.

Effects of tool edge radius on chip formation during the micromachining of pure iron

2020 ◽  
Vol 108 (7-8) ◽  
pp. 2121-2130
Author(s):  
Xiaoguang Guo ◽  
Yang Li ◽  
Linquan Cai ◽  
Jiang Guo ◽  
Renke Kang ◽  
...  
Keyword(s):  
Chip Formation ◽  
Pure Iron ◽  
Tool Edge Radius ◽  
Edge Radius ◽  
Tool Edge ◽  
On Chip

On the Steady-State Workpiece Flow Mechanism and Force Prediction Considering Piled-Up Effect and Dead Metal Zone Formation

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Cheng Hu ◽  
Weiwei Zhang ◽  
Kejia Zhuang ◽  
Jinming Zhou ◽  
Han Ding
Keyword(s):  
Stagnation Point ◽  
Shear Stresses ◽  
Flow Mechanism ◽  
Zone Formation ◽  
Force Prediction ◽  
Tool Edge Radius ◽  
Edge Radius ◽  
Dead Metal Zone ◽  
Tool Edge ◽  
Material Separation

Abstract The manufacturing of miniaturized components is indispensable in modern industries, where the uncut chip thickness (UCT) inevitably falls into a comparable magnitude with the tool edge radius. Under such circumstances, the ploughing phenomenon between workpiece and tool becomes predominant, followed by the notable formation of dead metal zone (DMZ) and piled-up chip. Although extensive models have been developed, the critical material flow status in such microscale is still confusing and controversial. In this study, a novel material separation model is proposed for the demonstration of workpiece flow mechanism around the tool edge radius. First, four critical positions of workpiece material separation are determined, including three points characterizing the DMZ pattern and one inside considered as stagnation point. The normal and shear stresses as well as friction factors along the entire contact region are clarified based on slip-line theory. It is found that the friction coefficient varies symmetrically about the stagnation point inside DMZ and remains constant for the rest. Then, an analytical force prediction model is developed with Johnson–Cook constitutive model, involving calibrated functions of chip-tool contact length and cutting temperature. The assumed tribology condition and morphologies of material separation including DMZ are clearly observed and verified through various finite element (FE) simulations. Finally, comparisons of cutting forces from cutting experiments and predicted results are adopted for the validation of the predictive model.

Finite Element Simulation of Precision Cutting Monocrystalline Silicon

2013 ◽  
Vol 662 ◽  
pp. 99-102 ◽  
Author(s):  
Li Qiu Shi ◽  
Xiao Wen Li ◽  
Feng Yu
Keyword(s):  
High Surface ◽  
Cutting Speed ◽  
Monocrystalline Silicon ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Tool Edge Radius ◽  
Transition Mechanism ◽  
Edge Radius ◽  
Tool Edge ◽  
Optimization Of Cutting Parameters

Monocrystalline silicon is typical of hard brittle materials, a high surface quality can be obtained in ductile-regime cutting. The success of the turning process depends on optimizing the machining parameters such as the tool edge radius, tool rake angles, depth of cut and cutting speed, etc. In this study, based on the ductile–brittle transition mechanism, the optimization of cutting parameters were determined with the commercial, general purpose FEA software Msc.Marc. The result demonstrates that the value of temperature is minimum when the tool rake angle is in the range of -15º～-30º. Smaller tool edge radius was selected while maintaining quality of tool edge radius and tool life. As long as beyond the range of cutting speed 6 ~ 8 mm/s, smaller residual stress can be obtain.

An Analytical Model for the Prediction of Minimum Chip Thickness in Micromachining

2005 ◽  
Vol 128 (2) ◽  
pp. 474-481 ◽  
Author(s):  
X. Liu ◽  
R. E. DeVor ◽  
S. G. Kapoor
Keyword(s):  
Analytical Model ◽  
Chip Thickness ◽  
Machining Process ◽  
Thickness Effect ◽  
Uncut Chip Thickness ◽  
Minimum Chip Thickness ◽  
Tool Edge Radius ◽  
Edge Radius ◽  
Tool Edge ◽  
Cutting Velocity

In micromachining, the uncut chip thickness is comparable or even less than the tool edge radius and as a result a chip will not be generated if the uncut chip thickness is less than a critical value, viz., the minimum chip thickness. The minimum chip thickness effect significantly affects machining process performance in terms of cutting forces, tool wear, surface integrity, process stability, etc. In this paper, an analytical model has been developed to predict the minimum chip thickness values, which are critical for the process model development and process planning and optimization. The model accounts for the effects of thermal softening and strain hardening on the minimum chip thickness. The influence of cutting velocity and tool edge radius on the minimum chip thickness has been taken into account. The model has been experimentally validated with 1040 steel and Al6082-T6 over a range of cutting velocities and tool edge radii. The developed model has then been applied to investigate the effects of cutting velocity and edge radius on the normalized minimum chip thickness for various carbon steels with different carbon contents and Al6082-T6.

Analyzing the effect of tool edge radius on cutting temperature in micro-milling process

2010 ◽  
Author(s):  
Y. C. Liang ◽  
K. Yang ◽  
K. N. Zheng ◽  
Q. S. Bai ◽  
W. Q. Chen ◽  
...  
Keyword(s):  
Cutting Temperature ◽  
Milling Process ◽  
Micro Milling ◽  
Tool Edge Radius ◽  
Edge Radius ◽  
Tool Edge

Determination of Minimum Uncut Chip Thickness in Micromachining

2009 ◽  
Vol 69-70 ◽  
pp. 408-412 ◽  
Author(s):  
Zhen Yu Shi ◽  
Zhan Qiang Liu
Keyword(s):  
Surface Deformation ◽  
Geometric Model ◽  
Chip Thickness ◽  
Uncut Chip Thickness ◽  
Tool Edge Radius ◽  
Minimum Value ◽  
Edge Radius ◽  
Cutting Surface ◽  
Minimum Uncut Chip Thickness ◽  
Tool Edge

In micromachining, the uncut chip thickness is comparable to the tool edge radius, and chip won’t be generated if the uncut chip thickness is less than a critical value, besides that, the minimum uncut chip thickness affect many factors such as the cutting force, the chip’s modality, the cutting surface quality, etc. In this paper, a geometric model is developed to predict the minimum uncut chip thickness values. The model accounts for the theory that the critical condition of producing chip is when the friction of the surface deformation asperities is zero. Two situations when the minimum value is larger or smaller than the tool edge radius respectively to predict the minimum value are discussed. The influences of tool edge radius and material’s property on the minimum uncut chip thickness are taken into account.

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