Study of residual stresses in conventional and high-speed milling.

F.V. DÍAZ; C.A. MAMMANA

Milling: Operations, Applications and Industrial Effects

Nova Science Publishers, Inc.

Lugar: New York; Año: 2012; p. 127 - 155

Residual stresses induced by conventional and high-speed face milling in samples of AA 7075-T6 aluminium alloy were exhaustively evaluated. This evaluation was carried out along the symmetry axes of the generated surfaces, and also in the centroids of climb and conventional cutting regions. An indentation method -based on the use of a universal measuring machine- was evaluated in order to determine such residual stresses. From the effective use of this method, it was possible to markedly decrease the absolute error of measurement. Different Mohr circles were analyzed to compare the surfaces generated by climb and conventional cutting. Residual stress distributions and tensors corresponding to low and high-speed milling were also compared. This comparison was performed from samples milled with cutting speeds that differed by an order of magnitude. Finally, from thermal effects generated in the primary cutting zone it was possible to explain the different states of residual stress generated by face milling.