1997 Volume 47 Issue 3 Pages 151-157
In order to resolve the chip disposal problem during drilling, the chip formation process during intermittently decelerated feed drilling is considered. Long continuous chips are formed in conventional drilling. As a prelude to obtaining the necessary basic data for control the chip shape, the relation between cutting variables of intermittently decelerated feed drilling and chip shape was investigated using 2017 aluminum alloy that entails difficult chip disposal, (1) Chip breakage increases at a deceleration ratio that gives rise to large variations in shear angle during drilling. (2) The amplitude of the dynamic component of thrust and torque in intermittently decelerated feed drilling is greatly influenced by the deceleration ratio. (3) At an appropriate deceleration ratio during intermittently decelerated feed drilling, chips formed break into suitable lengths thus, making it an effective drilling method for achieving good chip disposal.
