The Analysis of Saw-Tooth Chip Formation in High Speed Machining through Material Micro-Hardness Measurement

Abstract:

The material micro-hardness is used to reflect the plastic deformation within the localized shear band and the segment of saw-tooth chip. A high strength alloy steel Aermet 100 is taken as the workpiece material. The saw-tooth chip roots are obtained by cutting operation. The material micro-harnesses along the shortly initiated localized shear band, across the shortly initiated localized shear band and fully developed localized shear band, and within the segment are examined and analyzed. The localized shear band initiation and propagation are revealed by a new proposed model. The results show the localized shear band initiates firstly at the tool tip end of the primary shear band, and consequently another localized shear nucleates at the free surface end of the primary shear band. These two localized shears propagate face to face until the whole localized shear band is formed.

• Periodical: Advanced Materials Research (Volume 188)
• Pages: 9-14
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.188.9
• Online since: March 2011
• Authors: Guo Sheng Su, Zhan Qiang Liu
• Keywords: Initiation, Localized Shear Band, Microhardness, Propagation, Saw-Tooth Chip

References

[1] R. Komanduri, Z. -B. Hou, On the thermoplastic shear instability in the machining of a titanium alloy (Ti–6Al–4V), Metall. Mater. Tran. 33A (2002) 2995-3010.

DOI: 10.1007/s11661-002-0284-1

[2] R. Komanduri, T.A. Schroeder, On shear instability in machining nickel-iron base superalloy, ASME J. Eng. Ind. 108 (1986) 93-100.

DOI: 10.1115/1.3187056

[3] R. Komanduri, T.A. Schroeder, J. Hazra, B.F. von Turkovich, D.G. Flom, On the catastrophic shear instability in high-speed machining of an AISI 4340 steel, ASME J. Eng. Ind. 104 (1982) 121-131.

DOI: 10.1115/1.3185807

[4] B. Denkena, R. Ben Amor, L. de León-García and J. Dege, Material specific definition of the high speed cutting range, Int. J. Machining and Machinability of Materials, 2 (2) (2007) 176-185.

DOI: 10.1504/ijmmm.2007.013781

[5] K. Nakayama, M. Arai, T. Kanda, Machining characteristics of hard materials, CIRP Annals 37 (1) (1988) 89-92.

DOI: 10.1016/s0007-8506(07)61592-3

[6] M.C. Shaw, A. Vyas, Chip formation in the machining of hardened steel, CIRP Annals 42 (1) (1993) 29-33.

DOI: 10.1016/s0007-8506(07)62385-3

[7] R. Recht, A dynamic analysis of high speed machining, ASME J. Eng. Ind. 107(1) (1985) 309-315.

[8] R. Komanduri, B.F.V. Turkovich, New observations on the mechanism of chip formation when machining titanium alloys, Wear 69 (1981) 179-188.

DOI: 10.1016/0043-1648(81)90242-8

[9] J. Barry, G. Byrne, D. Lennon, Observations on chip formation and acoustic emission in machining Ti–6Al–4V alloy, Int. J. Mach. Tool. Manu. 41 (2001) 1055-1070.

DOI: 10.1016/s0890-6955(00)00096-1

[10] K. Nakayama, The formation of saw tooth chips, Internat. Conf. on Prod. Eng., Tokyo, (1974) 572-577.

[11] M. C. Shaw, and A. Vyas, The Mechanisms of Chip Formation With Hard Turning Steel, CIRP Annals 47(1) (1998) 77–82.

DOI: 10.1016/s0007-8506(07)62789-9

[12] R. F. Recht, A dynamic analysis of high speed machining, ASME J. Eng. Ind. 107(1985) 309-315.

[13] Y. B. Guo, David W. Yen, A FEM study on mechanisms of discontinuous chip formation in hard machining, J. Mater. Process. Technol. 155–156 (2004) 1350–1356.

DOI: 10.1016/j.jmatprotec.2004.04.210

[14] J. Lorentzon, N. Järvsträt, B.L. Josefson, Modeling chip formation of alloy 718, J. Mater. Process. Technol. 209 (2009) 4645-4653.

DOI: 10.1016/j.jmatprotec.2008.11.029

[15] J. Buda. New methods in the study of plastic deformation in the cutting zone. CIRP Annals, 21(1972) 17-18.

[16] Gente A, Hoffmeister HW, Chip formation in machining Ti–6Al–4V at extremely high cutting speeds. CIRP Annals 50/1 (2001) 49–52.

DOI: 10.1016/s0007-8506(07)62068-x