Abstract
Effect of Si particles on chipping characteristics of 6061 based aluminum alloys under two-dimensional cutting operations has been investigated. The formation of fine chips was promoted by adding above 2 mass% Si to the 6061 alloy. Induced shear strain on shear plane decreased with the increase in Si contents, while radius of curled chip reduced, leading to an increase in normal strain by bending. Si particles in the alloys reduced coefficient of friction between chip and rake surface of tool. It was therefore supported that the increase in normal strain by bending resulted from a reduction of radius of chips led to an easy fracture of chips.
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