In this paper, a viscoplastic material model is proposed for drilling of metals. An analytical model is developed for predicting thrust force and torque in drilling with a twist drill. The thermomechanical properties are taken into consideration to describe the material flow in the primary shear zone and at the element—chip interface. The Johnson—Cook model is used. A temperature friction law is introduced. The approach is based on representing the cutting forces along the cutting lips as a series of oblique elements. Similarly, cutting in the chisel region is treated as orthogonal cutting with different speeds depending on the radial location. The section forces obtained by the model are combined to determine the overall thrust force and drilling torque. The results of the model are compared with the experimental results obtained by Bagci and Ozcelik in 2006 on Al 7075-T651.
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