Ultra-precision orthogonal cutting simulation for oxygen-free high-conductivity copper

1997 ◽  
Vol 65 (1-3) ◽  
pp. 281-291 ◽  
Author(s):  
Zone-Chin Lin ◽  
Ship-Peng Lo
Keyword(s):  
Orthogonal Cutting ◽  
High Conductivity ◽  
Cutting Simulation ◽  
Ultra Precision

scholarly journals Constitutive Model and Cutting Simulation of Titanium Alloy Ti6Al4V after Heat Treatment

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4145
Author(s):  
Xiaohua Qian ◽  
Xiongying Duan
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Titanium Alloy ◽  
Orthogonal Cutting ◽  
Treatment Method ◽  
Dynamic Mechanical Properties ◽  
Ti6al4v Alloy ◽  
Stress Strain ◽  
Cutting Simulation ◽  
Titanium Alloy Ti6al4v

As a typical high specific strength and corrosion-resistant alloy, titanium alloy Ti6Al4V is widely used in the aviation, ocean, biomedical, sport, and other fields. The heat treatment method is often used to improve the material mechanical properties. To investigate the dynamic mechanical properties of titanium alloy Ti6Al4V after heat treatment, dynamic compressive experiments under high temperature and high strain rate were carried out using split Hopkinson press bar (SHPB) equipment. The stress–strain curves of Ti6Al4V alloy under different temperatures and strain rates were obtained through SHPB compressive tests. The Johnson–Cook (J–C) constitutive equation was used for expressing the stress–strain relationship of titanium alloy under large deformation. In addition, the material constants of the J–C model were fitted based on the experimental data. An orthogonal cutting simulation was performed to investigate the cutting of Ti6Al4V alloy under two different numerical calculation methods based on the established J–C model using the finite element method (FEM). The simulation results confirm that the adiabatic mode is more suitable to analyze the cutting of Ti6Al4V alloy.

Cyclic shear angle for lamellar chip formation in ultra-precision machining

2020 ◽  
Vol 234 (13) ◽  
pp. 2673-2680 ◽  
Author(s):  
Shaojian Zhang ◽  
Pan Guo ◽  
Zhiwen Xiong ◽  
Suet To
Keyword(s):  
Chip Formation ◽  
Diamond Tool ◽  
Orthogonal Cutting ◽  
Rake Angle ◽  
Shear Angle ◽  
Precision Machining ◽  
Cyclic Shear ◽  
Intrinsic Mechanism ◽  
Classical Models ◽  
Ultra Precision

Shear angle is classically considered constant. In the study, a series of straight orthogonal cutting tests of ultra-precision machining revealed that shear angle cyclically evolved with each lamellar chip formation, i.e. cyclic shear angle. It grew up from an initial shear angle of 0° to a final shear angle 90°- α ( α: tool rake angle) and underwent a series of transient shear angles like classical shear angles and a critical shear angle. The critical shear angle is the sum of the half of the tool rake angle and the characteristic shear angle determined by material anisotropy without the friction effect. Moreover, a new model was developed. Further, a series of face turning tests of ultra-precision machining verified that the cyclic shear angle was the intrinsic mechanism of cyclic cutting forces and lamellar chip formation to induce twin-peak high-frequency multimode diamond-tool-tip vibration. Significantly, the study draws up an understanding of shear angle for the discrepancy among the classical models.

Surface integrity under diamond tool wear effects in ultra-precision raster milling of a Zn–Al–Cu alloy

2018 ◽  
Vol 233 (4) ◽  
pp. 1111-1118 ◽  
Author(s):  
Zengwen Dong ◽  
Shaojian Zhang ◽  
Zhiwen Xiong
Keyword(s):  
Tool Wear ◽  
Surface Integrity ◽  
High Speed ◽  
Diamond Tool ◽  
Flank Wear ◽  
Orthogonal Cutting ◽  
Phase Changes ◽  
Crater Wear ◽  
Cu Alloy ◽  
Ultra Precision

In ultra-precision raster milling, the material removal process determines surface integrity. In this study, surface integrity was discussed under diamond tool wear effects in ultra-precision raster milling of a Zn–Al–Cu alloy. The results firstly showed that under high speed cutting in ultra-precision raster milling, quenching took place with phase decomposition (namely twin phase changes) with a deformation thickness of even less than 100 nm. Flank wear enhanced phase changes, promoted surface hardening, degraded surface quality, and increased deformation thickness, but crater wear gave better surface integrity. The intrinsic reason is that flank wear caused more external stress but crater wear was reverse, well supported by finite element simulation in orthogonal cutting. Significantly, it provides a further insight into diamond tool wear effects on surface integrity in ultra-precision raster milling of a Zn–Al–Cu alloy.

scholarly journals The CEL Method as an Alternative to the Current Modelling Approaches for Ti6Al4V Orthogonal Cutting Simulation

Procedia CIRP ◽  
2017 ◽  
Vol 58 ◽  
pp. 245-250 ◽  
Author(s):  
F. Ducobu ◽  
P.-J. Arrazola ◽  
E. Rivière-Lorphèvre ◽  
G. Ortiz de Zarate ◽  
A. Madariaga ◽  
...  
Keyword(s):  
Orthogonal Cutting ◽  
Cutting Simulation ◽  
Current Modelling ◽  
Modelling Approaches

Analysis of Mechanical Property of Crystal CaF2 and Effects of Tool Rake Angle on Ductile Machining Process

2010 ◽  
Vol 126-128 ◽  
pp. 891-896 ◽  
Author(s):  
Ming Jun Chen ◽  
Wen Bin Jiang
Keyword(s):  
Orthogonal Cutting ◽  
Chip Thickness ◽  
Rake Angle ◽  
Machining Process ◽  
A Value ◽  
Ductile Machining ◽  
Shear Yield ◽  
Ultra Precision ◽  
Element Approach ◽  
Crystallographic Planes

Indentations on the three main crystallographic planes (100), (110), and(111) of CaF2 were analyzed. Appropriate material parameters were obtained by experimental load-displacement curves. The results show a value in the range of 70–110 MPa for the initial shear yield strength. The submicron-level orthogonal cutting process of CaF2 had been investigated by the finite element approach, and the effects of tool rake angle on cutting stress and chip formation were investigated. The results indicate that increasing the tool rake angle causes a significant increase in stress and a decrease in chip thickness. The simulation results from the present study show the optimal tool rake angle to the ultra-precision cutting of CaF2 is -20°.

scholarly journals Friction Model for Tool/Work Material Contact Applied to Surface Integrity Prediction in Orthogonal Cutting Simulation

Procedia CIRP ◽  
2017 ◽  
Vol 58 ◽  
pp. 578-583 ◽  
Author(s):  
L.A. Denguir ◽  
J.C. Outeiro ◽  
J. Rech ◽  
G. Fromentin ◽  
V. Vignal ◽  
...  
Keyword(s):  
Surface Integrity ◽  
Orthogonal Cutting ◽  
Friction Model ◽  
Cutting Simulation ◽  
Work Material ◽  
Material Contact
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