The influence of friction models on finite element simulations of machining

In the analysis of orthogonal cutting process using finite element (FE) simulations, predictions are greatly influenced by two major factors; a) flow stress characteristics of work material at cutting regimes and b) friction characteristics mainly at the tool-chip interface. The uncertainty of work material flow stress upon FE simulations may be low when there is a constitutive model for work material that is obtained empirically from high-strain rate and temperature deformation tests. However, the difficulty arises when one needs to implement accurate friction models for cutting simulations using a particular FE formulation. In this study, an updated Lagrangian finite element formulation is used to simulate continuous chip formation process in orthogonal cutting of low carbon free-cutting steel. Experimentally measured stress distributions on the tool rake face are utilized in developing several different friction models. The effects of tool-chip interfacial friction models on the FE simulations are investigated. The comparison results depict that the friction modeling at the tool-chip interface has significant influence on the FE simulations of machining. Specifically, variable friction models that are developed from the experimentally measured normal and frictional stresses at the tool rake face resulted in most favorable predictions. Predictions presented in this work also justify that the FE simulation technique used for orthogonal cutting process can be an accurate and viable analysis as long as flow stress behavior of the work material is valid at the machining regimes and the friction characteristics at the tool-chip interface is modeled properly.

[1]  Tuğrul Özel,et al.  Process simulation using finite element method — prediction of cutting forces, tool stresses and temperatures in high-speed flat end milling , 2000 .

[2]  M. Ortiz,et al.  Modelling and simulation of high-speed machining , 1995 .

[3]  Martin Bäker,et al.  A finite element model of high speed metal cutting with adiabatic shearing , 2002 .

[4]  Kanji Ueda,et al.  Rigid-Plastic FEM Analysis of Three-Dimensional Deformation Field in Chip Formation Process , 1993 .

[5]  T. Özel,et al.  Determination of work material flow stress and friction for FEA of machining using orthogonal cutting tests , 2004 .

[6]  Jaroslav Mackerle,et al.  Finite element analysis and simulation of machining: an addendum: A bibliography (1996–2002) , 2003 .

[7]  Tom Childs,et al.  Computer-aided simulation and experimental studies of chip flow and tool wear in the turning of low alloy steels by cemented carbide tools , 1990 .

[8]  John S. Strenkowski,et al.  Finite element models of orthogonal cutting with application to single point diamond turning , 1988 .

[9]  Toshiyuki Obikawa,et al.  The Prediction of Effects of Cutting Condition on Mechanical Characteristics in Machined Layer , 1994 .

[10]  Richard E. DeVor,et al.  Microstructure-Level Modeling of Ductile Iron Machining , 2001, Manufacturing Engineering.

[11]  Warren R. DeVries,et al.  Analysis of Material Removal Processes , 1991 .

[12]  Tom Childs,et al.  MATERIAL PROPERTY NEEDS IN MODELING METAL MACHINING , 1998 .

[13]  R. DeVor,et al.  Machining Simulation of Ductile Iron and its Constituents: Part II — Numerical Simulation and Experimental Validation of Machining , 2001, Manufacturing Engineering.

[14]  Larsgunnar Nilsson,et al.  An ALE formulation for the solution of two-dimensional metal cutting problems , 1999 .

[15]  M. S. Gadala,et al.  SIMULATION OF CHIP FORMATION IN ORTHOGONAL METAL CUTTING PROCESS: AN ALE FINITE ELEMENT APPROACH , 2000 .

[16]  M. G. Stevenson,et al.  Using the Finite Element Method to Determine Temperature Distributions in Orthogonal Machining , 1974 .

[17]  A. H. Adibi-Sedeh,et al.  UNDERSTANDING OF FINITE ELEMENT ANALYSIS RESULTS UNDER THE FRAMEWORK OF OXLEY'S MACHINING MODEL , 2005 .

[18]  Pierre Joyot,et al.  Arbitrary Lagrangian-Eulerian thermomechanical finite-element model of material cutting , 1993 .

[19]  C. Liu,et al.  Mechanical Properties of Hardened AISI 52100 Steel in Hard Machining Processes , 2002 .

[20]  Kyriakos Komvopoulos,et al.  Finite Element Modeling of Orthogonal Metal Cutting , 1991 .

[21]  Fritz Klocke,et al.  2D-FEM SIMULATION OF THE ORTHOGONAL HIGH SPEED CUTTING PROCESS , 2001 .

[22]  David K. Aspinwall,et al.  Modelling of hard part machining , 2002 .

[23]  Xiaoping Yang,et al.  A new stress-based model of friction behavior in machining and its significant impact on residual stresses computed by finite element method , 2002 .

[24]  Elisabetta Ceretti,et al.  FEM simulation of orthogonal cutting: serrated chip formation , 1999 .

[25]  Toshiyuki Obikawa,et al.  FEM analysis on three dimensional cutting: analysis on large deformation problem of tool entry , 1993 .

[26]  Richard E. DeVor,et al.  Machining Simulation of Ductile Iron and Its Constituents, Part 2: Numerical Simulation and Experimental Validation of Machining , 2001 .

[27]  J. Strenkowski,et al.  Finite element prediction of chip geometry and tool/workpiece temperature distributions in orthogonal metal cutting , 1990 .

[28]  Albert J. Shih,et al.  Finite Element Simulation of Orthogonal Metal Cutting , 1995 .

[29]  Jaroslav Mackerle,et al.  Finite-element analysis and simulation of machining: a bibliography (1976–1996) , 1999 .

[30]  J. T. Black,et al.  An Evaluation of Chip Separation Criteria for the FEM Simulation of Machining , 1996 .

[31]  Tom Childs,et al.  Finite element simulation of chip flow in metal machining , 2001 .

[32]  A. Bagchi,et al.  Finite Element Simulation of Chip Formation and Comparison with Machining Experiment , 1994 .

[33]  C. Richard Liu,et al.  The Influence of Material Models on Finite Element Simulation of Machining , 2004 .

[34]  T. Özel,et al.  Determination of workpiece flow stress and friction at the chip-tool contact for high-speed cutting , 2000 .

[35]  Yusuf Altintas,et al.  Numerical Analysis of Metal Cutting With Chamfered and Blunt Tools , 2002 .

[36]  Y. Tzeng.  Effects of process parameters on the corrosion rate of pulsed Nd:YAG laser-welded zinc-coated steel , 2002 .

[37]  Eiji Usui,et al.  Flow stress of low carbon steel at high temperature and strain rate. I: Propriety of incremental strain method in impact compression test with rapid heating and cooling systems , 1983 .

[38]  Elisabetta Ceretti,et al.  Application of 2D FEM to chip formation in orthogonal cutting , 1996 .

[39]  J. Strenkowski,et al.  A Finite Element Model of Orthogonal Metal Cutting , 1985 .

[40]  Yuebin Guo,et al.  3D FEA Modeling of Hard Turning , 2002 .

[41]  C. Liu,et al.  Finite element analysis of the effect of sequential cuts and tool-chip friction on residual stresses in a machined layer , 2000 .

[42]  T. I. El-Wardany,et al.  PHYSICS-BASED SIMULATION OF HIGH SPEED MACHINING , 2002 .

[43]  S. Lin,et al.  A Coupled Finite Element Model of Thermo-Elastic-Plastic Large Deformation for Orthogonal Cutting , 1992 .