Effect of turning parameters on the surface of sintered self-lubricating composites
- 73 Downloads
The objective of this research is to study the influence of cutting parameters on the quality and integrity of machined surfaces obtained by a longitudinal external turning in a sintered self-lubricating composite. Tests were performed at cutting speeds of 100 and 200 m/min, feed of 0.1 and 0.2 mm, and cutting depths of 0.5 and 1 mm for the materials manufactured by single and double pressing. The materials tested are composites with matrix composition of Fe-Ni-C-Si containing solid lubricants, which were subjected to the pressing process and subsequent sintering. The analysis of machined surfaces indicates that the large amount of ferrite in the microstructure of the matrix combined with the type of insert used in the tests caused high plastic deformation of the surfaces. However, solid lubricant particles were left exposed on the surfaces produced after machining. The roughness parameters Sdq (rms surface slope) and Str (texture aspect ratio) were influenced only by variations in the cutting speed. The roughness parameter Sq (root mean square height) was influenced by the variations in the cutting speed and feed as well as the material manufacturing route. Plastic deformation caused by machining led to the closing of pores, which affected the integrity of machined surfaces. The hardness of the surface boundary layer was approximately 30% higher compared with the boundary layer of sintered surfaces.
KeywordsMachining Machined surfaces texture Integrity of machined surfaces Self-lubricating composites
Unable to display preview. Download preview PDF.
The authors would like to thank CNPQ, CAPES, and Whirlpool-Embraco for funding this research. The authors would also like to thank LABMAT, LCM, CERMAT, LMP, and the Program of Post-Graduation in Mechanical Engineering (POSMEC) of the Federal University of Santa Catarina.
- 6.Donnet C, Erdemir A (2004) Solid lubricant coatings: recent developments and future trends. Tribol Lett 17:389–397. https://doi.org/10.1023/B:TRIL.0000044487.32514.1d CrossRefGoogle Scholar
- 7.Erdemir A (2005) Review of engineered tribological interfaces for improved boundary lubrication. Tribol Int 38:249–256. https://doi.org/10.1023/B:TRIL.0000044487.32514.1d CrossRefGoogle Scholar
- 14.König W, Klocke F (1997) Fertigungsverfahren 1. drehen, fräsen, bohren, 5th edn. Springer-Verlag GmbH, BerlinGoogle Scholar
- 15.Trent EM, Wright, PK (2000) Metal cutting, 4th edn. Butterworth-HeinemannGoogle Scholar
- 16.Davim JP (2008) Machining fundamentals and recent advances. Springer-Verlag, LondonGoogle Scholar
- 24.Griffiths B (2001) Manufacturing surface technology. Penton Press, LondonGoogle Scholar
- 25.Machado R, Ristow W, Klein AN, Muzart JLR, Fredel MC, Wendhausen PAP, Fusão D, Alba PR, Da Silva NFO, Mendes LA (2010) Industrial plasma reactor for plasma assisted thermal debinding of powder injection-molded parts, U.S. Patent 7 718919. https://www.google.com/patents/US7718919. Accessed 18 May 2010
- 26.Metal Powder Industries Federation (2012) Standard test methods for metal powders and powder metallurgy products. pp 37–42Google Scholar
- 27.Callister WDJ (2005) Fundamentals of materials science and engineering: an integrated approach, 2nd edn. John Wiley and SonsGoogle Scholar
- 28.Blunt L, Jiang X (2003) Advanced techniques for assessment surface topography: development of a basis for 3D surface texture standards “Surfstand”. Kogan Page ScienceGoogle Scholar
- 29.International Organization for Standardization ISO 16610-71 (2014) Geometrical product specifications (gps) – filtration – part 71: robust areal filters – gaussian regression filtersGoogle Scholar
- 30.International Organization for Standardization ISO 6507–1 (2018) Metallic materials – vickers hardness test – part 1: test method, 2nd edn.Google Scholar
- 31.Montgomery DC, Runger GC (2003) Applied statistics and probability for engineers, 2nd edn. John Wiley and SonsGoogle Scholar
- 41.Whitehouse DJ (2002) Surfaces and their measurement. Butterworth-HeinemannGoogle Scholar
- 43.Blunt L, Jiang X (2003) Advanced techniques for assessment surface topography: development of a basis for 3D surface texture standards “surfstand”. Butterworth-HeinemannGoogle Scholar
- 44.Whitehouse DJ (1994) Handbook of surface metrology. Institute of PhysicsGoogle Scholar