科研之友
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摘要
The shear angle is one of the important factors in cutting deformation and the shear angle theory reveals the relationship between the shear behavior in the primary zone and the tool-chip friction behavior in the secondary zone. In order to deepen the understanding of shear angle theory, the study investigated the shear angle variation in aluminum alloy Al6061-T6 and compared the three conventional shear angle models, Merchant, Lee and Shaffer, and Hucks. To obtain the shear angle more conveniently, a simple approach utilizing the connection between the shear angle and chip thickness was proposed. Orthogonal cutting experiments were conducted on aluminum alloy Al6061-T6. A new cutting simulation model for shear angle and chip thickness of Al6061 with errors below 15% and 10% respectively was proposed in the study. What's more, it was found that the three shear angle models have their applicable ranges in cutting speed for the aluminum alloy. It is mainly because the internal friction coefficient of workpiece material decreased as cutting speed rose.
