AN INVESTIGATIVE STUDY OF THE INTERFACE HEAT TRANSFER COEFFICIENT FOR FE MODELLING OF HIGH SPEED MACHINING

This paper is concerned with the development of an experimental setup and Finite Element (FE) modelling of dry sliding of metals to estimate interface heat transfer coefficient. Heat transfer between the chip, the tool, and the environment during the metal machining process has an impact on temperatures, wear mechanisms and hence on tool-life and on the accuracy of the machined component. For modelling of the metal machining process, the interface heat transfer coefficient is an important input parameter to quantify the transfer of heat between the chip and the tool and to accurately predict the temperature distribution within the cutting tool. In previous studies involving FE analysis of metal machining process, the heat transfer coefficient has been assumed to be between 10-500 kW/m2 oC (0.49-24.5 BTU/sec/ft2/oF), with a background from metal forming processes (especially forging). Based on the operating characteristics, metal forming and machining processes are different in nature. Hence there was a need to develop a procedure close to metal machining process, to estimate this parameter in order to increase the reliability of FE models. To this end, an experimental setup was developed, in which an uncoated cemented carbide pin was rubbed against a steel workpiece while the later was rotated at speeds similar to the cutting tests. This modified pin-on-disc set-up was equipped with temperature and force monitoring equipment. A FE model was constructed for heat generation and frictional contact. The experimental and modelling results of the dry sliding process yield the interface heat transfer coefficient for a range of rubbing speeds.

[1]  Pedro J. Arrazola,et al.  SERRATED CHIP PREDICTION IN FINITE ELEMENT MODELING OF THE CHIP FORMATION PROCESS , 2007 .

[2]  Albert Albers,et al.  Contact and thermal analysis of an alumina—steel dry sliding friction pair considering the surface roughness , 2007 .

[3]  Paul Mativenga,et al.  Characterization of machining of AISI 1045 steel over a wide range of cutting speeds. Part 1: Investigation of contact phenomena , 2007 .

[4]  Maan Aabid Tawfiq,et al.  A Finite Element Analysis of Orthogonal Machining Using Different Tool Edge Geometries , 2007, Engineering and Technology Journal.

[5]  Reginaldo Teixeira Coelho,et al.  Tool wear when turning hardened AISI 4340 with coated PCBN tools using finishing cutting conditions , 2007 .

[6]  A. Molinari,et al.  Numerical modelling of orthogonal cutting: Influence of cutting conditions and separation criterion , 2006 .

[7]  Tuğrul Özel,et al.  The influence of friction models on finite element simulations of machining , 2006 .

[8]  Paul Mativenga,et al.  Investigation of heat partition in high speed turning of high strength alloy steel , 2005 .

[9]  J. Schmidt,et al.  2D FEM estimate of tool wear in turning operation , 2005 .

[10]  T. Altan,et al.  Computer Simulation of Orthogonal Cutting using a Tool with Multiple Coatings , 2004 .

[11]  Najib Laraqi,et al.  SIMULTANEOUS ESTIMATION OF FRICTIONAL HEAT FLUX AND TWO THERMAL CONTACT PARAMETERS FOR SLIDING CONTACTS , 2004 .

[12]  Taylan Altan,et al.  Estimation of tool wear in orthogonal cutting using the finite element analysis , 2004 .

[13]  Wit Grzesik,et al.  A computational approach to evaluate temperature and heat partition in machining with multilayer coated tools , 2003 .

[14]  D. O’Sullivan,et al.  Temperature measurement in single point turning , 2001 .

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

[16]  Thomas Childs,et al.  Metal Machining: Theory and Applications , 2000 .

[17]  V. Goizet,et al.  Experimental Study of the Thermal Boundary Condition at the Workpiece-Die Interface during Hot Forging , 1998 .

[18]  Leroy S. Fletcher,et al.  Design Graphs for Thermal Contact Conductance of Similar and Dissimilar Light Alloys , 1998 .

[19]  T A Dean,et al.  The interfacial heat transfer coefficient in hot die forging of titanium alloy , 1998 .

[20]  Leroy S. Fletcher,et al.  Thermal Contact Conductance of Non-Flat, Rough, Metallic Coated Metals , 1996, Heat Transfer: Volume 1 — Heat Transfer in Microgravity Systems; Radiative Heat Transfer and Radiative Heat Transfer in Low-Temperature Environments; Thermal Contact Conductance and Inverse Problems in Heat Transfer.

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

[22]  John G. Lenard,et al.  A study of the heat-transfer coefficient as a function of temperature and pressure , 1994 .

[23]  Taylan Altan,et al.  MEASUREMENT AND ANALYSIS OF HEAT-TRANSFER AND FRICTION DURING HOT-FORGING , 1990 .

[24]  W.Y.D. Yuen,et al.  Heat conduction in sliding solids , 1988 .

[25]  Taylan Altan,et al.  Determination of the Interface Heat Transfer Coefficient for Non-Isothermal Bulk-Forming Processes , 1987 .

[26]  Ward O. Winer,et al.  Transient Temperatures in the Vicinity of an Asperity Contact , 1985 .

[27]  W. R. Wells,et al.  Heat Transfer Aspects of Nonisothermal Axisymmetric Upset Forging , 1984 .

[28]  J. Barber,et al.  The Division of Frictional Heat—A Guide to the Nature of Sliding Contact , 1984 .

[29]  G. Rowe,et al.  Physics in metal cutting , 1973 .

[30]  James Barber,et al.  The conduction of heat from sliding solids , 1970 .

[31]  M. Cooper,et al.  Thermal contact conductance , 1969 .

[32]  A. Cameron,et al.  Contact temperatures in rolling/sliding surfaces , 1965, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[33]  J. K. Lancaster,et al.  The formation of surface films at the transition between mild and severe metallic wear , 1963, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[34]  A. Devillez,et al.  Cutting tool crater wear measurement with white light interferometry , 2004 .

[35]  Matz Lenner,et al.  High Speed Machining , 2001 .

[36]  J. Bos,et al.  Frictional heating of tribological contacts , 1995 .

[37]  Jack Jeswiet,et al.  Evaluation of Temperature and Heat Transfer Conditions at the Metal-Forming Interface , 1995 .

[38]  Sture Hogmark,et al.  Simulation of cutting tool wear by a modified pin-on-disc test , 1989 .

[39]  G. T. Symm,et al.  SURFACE TEMPERATURES OF TWO RUBBING BODIES , 1967 .