Analytical and experimental study of shear localization in chip formation in orthogonal machining

1995 ◽  
Vol 4 (1) ◽  
pp. 32-39 ◽  
Author(s):  
J. Q. Xie ◽  
A. E. Bayoumi ◽  
H. M. Zbib
Keyword(s):  
Experimental Study ◽  
Chip Formation ◽  
Shear Localization ◽  
Orthogonal Machining

Flow Instability in the Orthogonal Machining of CP Titanium

1997 ◽  
Vol 119 (3) ◽  
pp. 307-313 ◽  
Author(s):  
J. Sheikh-Ahmad ◽  
J. A. Bailey
Keyword(s):  
Shear Strain ◽  
Formation Process ◽  
Chip Formation ◽  
Flow Instability ◽  
Pure Titanium ◽  
Plastic Instability ◽  
Shear Localization ◽  
Instability Criterion ◽  
Commercially Pure Titanium ◽  
Orthogonal Machining

An experimental and analytical investigation of flow instability and shear localization in the orthogonal machining of grade 2 commercially pure titanium was made. A criterion for thermo-plastic instability was developed from torsion test results and applied to the analysis of the chip formation process. It was shown that flow instability followed by flow localization occurs when machining titanium at all cutting speeds and that a transition in the chip type from uniform to segmented does not occur. Orthogonal machining experiments were conducted in the speed range from 8.75 × 10−5 to 3.20 m/s for various depths of cut and the shear strain in the chip was calculated. It was shown that shear localization occurred in the chip formation process when the uniform shear strain involved in producing a chip segment reached a critical value and that this critical shear strain correlates fairly well with the instability shear strain predicted by the thermo-plastic instability criterion.

scholarly journals Experiments in the Machining of Ice at Negative Rake Angles

1984 ◽  
Vol 30 (104) ◽  
pp. 77-81 ◽  
Author(s):  
D.K. Lieu ◽  
C.D. Mote
Keyword(s):  
Cutting Force ◽  
Chip Formation ◽  
Cutting Tool ◽  
Cutting Tools ◽  
Cutting Speed ◽  
Rake Angle ◽  
Cutting Depth ◽  
Orthogonal Machining ◽  
Cutting Force Components ◽  
Force Components

AbstractThe cutting force components and the cutting moment on the cutting tool were measured during the orthogonal machining of ice with cutting tools inclined at negative rake angles. The variables included the cutting depth (< 1 mm), the cutting speed (0.01 ms−1to 1 ms−1), and the rake angles (–15° to –60°). Results of the experiments showed that the cutting force components were approximately independent of cutting speed. The resultant cutting force on the tool was in a direction approximately normal to the cutting face of the tool. The magnitude of the resultant force increased with the negative rake angle. Photographs of ice-chip formation revealed continuous and segmented chips at different cutting depths.

ANALYTICAL MODEL FOR CHIP FORMATION IN CASE OF ORTHOGONAL MACHINING PROCESS

2011 ◽  
Author(s):  
Ferdinando Salvatore ◽  
Tarek Mabrouki ◽  
Hédi Hamdi ◽  
Francisco Chinesta ◽  
Yvan Chastel ◽  
...  
Keyword(s):  
Analytical Model ◽  
Chip Formation ◽  
Machining Process ◽  
Orthogonal Machining

A Finite Element Study of Chip Formation Process in Orthogonal Machining

2011 ◽  
Vol 1 (4) ◽  
pp. 19-45 ◽  
Author(s):  
Amrita Priyadarshini ◽  
Surjya K. Pal ◽  
Arun K. Samantaray
Keyword(s):  
Finite Element ◽  
Chip Formation ◽  
Critical Role ◽  
Fe Model ◽  
Orthogonal Machining ◽  
Adiabatic Shearing ◽  
Segmented Chip ◽  
The Right ◽  
Distribution Of Stress ◽  
Continuous Chip

This paper examines the plane strain 2D Finite Element (FE) modeling of segmented, as well as continuous chip formation while machining AISI 4340 with a negative rake carbide tool. The main objective is to simulate both the continuous and segmented chips from the same FE model based on FE code ABAQUS/Explicit. Both the adiabatic and coupled temperature displacement analysis has been performed to simulate the right kind of chip formation. It is observed that adiabatic hypothesis plays a critical role in the simulation of segmented chip formation based on adiabatic shearing. The numerical results dealing with distribution of stress, strain and temperature for segmented and continuous chip formations were compared and found to vary considerably from each other. The simulation results were also compared with other published results; thus validating the developed model.

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