An analytical Machining models based on Flow Stress Properties for Non-Heat Treated and Heat Treated AISI 4140 Steel

다국어 초록 (Multilingual Abstract)

In this study, an experimental and theoretical program were carried out to determine the cutting forces and chip formation at different cutting speeds using a 0.4㎜ nose radius ceramic insert and -7˚ rake angle for non heat-treated AISI 4140 (27HRc) and heat-treated AISI 4140 (45 HRc) steel. The results obtained were compared to show the hardness differences between the materials. The secondary deformation zone thicknesses when comparing the two materials show different physical structure but similar size. These results were also discussed in light of the heat treatment and the effects it had on the machining characteristics of the material. In addition, the Oxley Machining Theory was used to predict the cutting forces for these materials and a comparison made. The predicted cutting performances were verified experimentally and showed good agreement with experimental data.

참고문헌 (Reference)

1 Oyane, M., "The Behaviour of Some Steels Under Dynamic Compression" 72-, 1967

2 Boothroyd, G., "Temeratures in Orthogonal Metal Cutting" 177 : 789-802, 1963

3 Qi, H. S., "Modelling of The Dynamic Tool-chip Interface in Metal Cutting" 138 (138): 201-207, 2003

4 Ng, E. G., "Modelling of Temperature and Forces when Orthogonally Machining Hardened Steel" 39 (39): 885-903, 1999

5 Stephenson, D. A., "Metal Cutting Theory and Practice" Marcel Dekker Inc 1997

6 Oxley, P. L. B., "Mechanics of Machining: An Analytical Approach to Assessing Machinableility" Halsted Press 1989

7 Jaspers, S. P. F. C, "Material Behaviour in Metal Cutting: Strains Strain Rates and Temperature in Chip Formation" 121 (121): 123-135, 2002

8 Becze, C. E., "High Strain Rate Shear Evaluation and Characterization of AISI D2 Tool Steel in Its Hardened State" 5 (5): 131-149, 2001

9 Poulachon, G., "Hard Turning: Chip Formation Mechanisms and Metallurgical Aspects" 122 : 406-412, 2000

10 Kopac, J, "Determinion of Flow Stress Properties of Machinable Materials with Help of Simple Compression and Orthogonal Machining Test" 41 (41): 1275-1282, 2001

11 Lee, T. H., "An Experimental and Theoretical Investigation for The Machining of Hardened Alloy Steels" School of Mechanical and Manufacturing Engineering, the University of New South Wales 2007

12 Lee, T. H., "An Experimental and Theoretical Comparison of Machining Non-heat Treated and Heat Treated AISI 4140 Steel" 293-302, 2005

13 Mathew, P., "Allowing for the Influence of Strain Hardening in Determining the Frictional Conditions at the Tool/Chip Interface in Machining" 69 (69): 219-234, 1981

14 McGregor, C. W., "A Velocity Modified Temperature for the Plastic Flow of Metals" 13 : A11-A16, 1946

15 Becze, C. E., "A Chip Formation Based Analytic Force Model for Oblique Cutting" 42 (42): 529-538, 2002