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SUMMARY:Research activities in the Machining Group of Politecnico di Torin
 o - Prof. Luca Settineri of the Politecnico di Torino
DTSTART:20080411T103000Z
DTEND:20080411T113000Z
UID:TALK11506@talks.cam.ac.uk
CONTACT:Roger Baker
DESCRIPTION:The research activities of the Machining Group at Politecnico 
 di Torino will be presented. \nResearch efforts are mainly concentrated in
  two directions:\n1.	Development and characterization of new coatings for 
 cutting tools with high wear resistance properties at elevated temperature
 s. \n2.	Numerical simulation of cutting process\, with the aim of forecast
 ing cutting variables\, such as forces\, tool wear\, residual stresses.\n\
 n1)	Development of coatings:\nThis objective arises from the industrial ne
 ed to reduce machining time and environmental impact of the machining oper
 ations\, in order to cut costs and health risks for the operators. \nThe u
 se of coatings for cutting tools is nowadays widespread\, however wear mec
 hanisms are not always understood\, and clear relationships between labora
 tory characterization tests and machining performance are seldom assessed.
  In particular\, this point is of key importance\, since the possibility o
 f translating the results of laboratory characterization tests into functi
 onal performances allows to cut development costs.\nNanocomposite coatings
 \, consisting of nanocrystalline AlTiN and AlCrN dispersed in a matrix of 
 amorphous Si3N4 were deposited onto hard metal substrates via Cathodic Arc
  PVD. The prepared materials were then used as cutting tools in milling op
 eration with application to AISI M2\, a difficult to cut die steel. Their 
 cutting performances were compared to those of a commercial nitride coatin
 g under dry conditions. \nCoating thickness\, adhesion properties and hard
 ness of the coatings were measured. Wear resistance was obtained via tribo
 logical tests\, under different temperatures and the main wear phenomena w
 ere studied\, using SEM-EDS. The results showed that such coatings are pro
 mising in milling operations and allowed to understand the main wear mecha
 nisms. \n\n2)	Numerical simulation of cutting:\nStringent control on the q
 uality of machined surface and sub-surface during machining of mechanical 
 components is necessary so as to achieve parts with greater reliability an
 d longevity. In particular\, residual stresses induced by machining proces
 ses play an important role on the lifetime of pieces. The characteristics 
 that are influenced by residual stress include fatigue life\, corrosion re
 sistance\, and part distortion\, making such issue particularly delicate i
 n the aeronautical industry. Several phenomena are responsible of these di
 stributions: mechanical effects\, thermal effects\, microstructure modific
 ations and/or a combination of the previous mechanisms. \nThe research wor
 k performed at DISPEA is aimed at achieving a comprehensive investigation 
 on the nature of deformation beneath the machined surface in 2D and 3D cut
 ting. Preliminary simulations have been done on INCONEL 718\, a typical ni
 ckel alloy for aeronautical use\, with the FE commercial code DEFORM-2D an
 d its library data. Model validation has been carried out by comparison of
  numerical results with experimental ones in terms of cutting forces and s
 urface and sub-surface residual stresses.\n
LOCATION:11:30 am in THE LECTURE THEATRE\, Institute for Manufacturing\, M
 ill Lane
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