In-process high-speed photography applied to orthogonal turning

Material behaviour understanding is a basic pillar for the building of predictive models applied to machining processes and the majority of the formulated material flow rules that are intimately associated to strain and strain rate. The use of high-speed filming allows observing a sequence of frozen images focused on the chip formation area when machining steel in orthogonal turning tests. This article presents the set-up and images acquired over square grid marked tube work-pieces on 42CrMo4 steel. Variables such as chip geometry, shear angle, strain, strain rate, chip thickness, and tool vibration amplitude are measured. Information acquired by the displacement of flow patterns allows measuring of plastic variables. Strain and strain rate results are calculated and compared to analytical modelling results. Industrial machining speeds and feeds are analysed by means of short shutter times, high image acquisition rates, and high magnifications achieving a good compromise between image quality, recording continuity, and cost of the equipment and experiments.

[1]  Pedro J. Arrazola,et al.  Analysis of the inverse identification of constitutive equations applied in orthogonal cutting process , 2007 .

[2]  W. Dale Compton,et al.  Severe plastic deformation (SPD) of titanium at near-ambient temperature , 2006 .

[3]  Manfred Geiger,et al.  Process design for hydroforming of lightweight metal sheets at elevated temperatures , 2003 .

[4]  M. C. Shaw,et al.  Mechanics of Machining: An Analytical Approach to Assessing Machinability , 1989 .

[5]  Guy Sutter,et al.  Chip geometries during high-speed machining for orthogonal cutting conditions , 2005 .

[6]  T. Vorm,et al.  Development of a quick-stop device and an analysis of the “frozen-chip” technique , 1976 .

[7]  M. E. Merchant.  Mechanics of the Metal Cutting Process. I. Orthogonal Cutting and a Type 2 Chip , 1945 .

[8]  J. H. Dautzenberg,et al.  Material behaviour in conditions similar to metal cutting : flow stress in the primary shear zone , 2002 .

[9]  H. Chandrasekaran,et al.  Investigation of the effects of tool micro-geometry and coating on tool temperature during orthogonal turning of quenched and tempered steel , 2004 .

[10]  Mohamed A. Elbestawi,et al.  Modeling the effects of microstructure in metal cutting , 2007 .

[11]  Fabrizio Micari,et al.  A critical analysis on the friction modelling in orthogonal machining , 2007 .

[12]  Gwo-Lianq Chern.  Development of a new and simple quick-stop device for the study on chip formation , 2005 .

[13]  Yung C. Shin,et al.  Material Constitutive Modeling Under High Strain Rates and Temperatures Through Orthogonal Machining Tests , 1997, Manufacturing Science and Engineering: Volume 2.

[14]  Tony L. Schmitz,et al.  Calibrated Thermal Microscopy of the Tool–Chip Interface in Machining , 2000 .

[15]  R. M'Saoubi,et al.  MODELLING OF MATERIAL FLOW STRESS IN CHIP FORMATION PROCESS FROM ORTHOGONAL MILLING AND SPLIT HOPKINSON BAR TESTS , 2005 .

[16]  C. A. Brown.  Strain analysis in machining using metallographic methods , 1987 .

[17]  J. C. Hamann,et al.  CRITERIA FOR THE QUALITY ASSESSMENT OF CONSTITUTIVE EQUATIONS DEDICATED TO CUTTING MODELS , 2002 .

[18]  R. H. Brown,et al.  A new Quick-Stop Device for Milling and Grinding , 1980 .

[19]  R. H. Brown,et al.  A double shear-pin quick-stop device for very rapid disengagement of a cutting tool , 1976 .

[20]  B. J. Griffiths,et al.  The development of a quick-stop device for use in metal cutting hole manufacturing processes , 1986 .

[21]  G. L. Baraya,et al.  Mechanical and photographic processes for producing a grid of lines , 1963 .

[22]  Arrazola Arriola,et al.  Modélisation numérique de la coupe : étude de sensibilité des paramètres d'entrée et identification du frottement entre outil-copeau , 2003 .

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

[24]  R. Armstrong,et al.  Dislocation-mechanics-based constitutive relations for material dynamics calculations , 1987 .

[25]  T. Childs,et al.  A new visio-plasticity technique and a study of curly chip formation , 1971 .

[26]  R. Komanduri,et al.  On the Mechanics of Chip Segmentation In Machining , 1981 .

[27]  Mohamed A. Elbestawi,et al.  From the basic mechanics of orthogonal metal cutting toward the identification of the constitutive equation , 2002 .

[28]  J. H. Dautzenberg,et al.  Material behaviour in metal cutting: strains, strain rates and temperatures in chip formation , 2002 .

[29]  Vincent Grolleau.  Approche de la validation expérimentale des simulations numériques de la coupe avec prise en compte des phénomèn locaux à l'arête de l'outil , 1996 .

[30]  Jihong Hwang,et al.  Large strain deformation field in machining , 2006 .