PPT Slide

Yesterday -

Summary of Research - cont.

• Both the matrix material properties and reinforcement properties impact machinability (machining cost).

• Reinforcement material, geometry, density and homogeneity are all factors.

• Porosity in castings is an issue.

Results - Impact of Material Properties:

Notes:

• Initial processing: i.e. “brew”, heat treat and forming also have effect on wear.
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  • It was found, the harder the heat treat, the lower the volumetric material removal rate, all else equal. A project that took this into account found a 5:1 difference in metal removal rate between T1 and T6.
  • The porosity resulting from casting will wear the tool. Porosity is essentially interrupted cuts. PCD will chip at the shock.
  • Particulate size, shape and density can significantly effect results. For a given Matrix material, one study found, that with a moderate decrease in particulate diameter (27%) a tool life increase of almost 500% was found. It was shown that it can be related to the standard Kinetic Energy Equation for a moving body - K.E.=1/2mv2, where the particulate is considered moving relative to the tool edge.