On the application of 3D finite element modeling for small-diameter hole drillin

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Abstract:


This paper studies the three-dimensional finite element (FE) modeling for simulating the small-hole drilling process of AIS] 1045 by using FE package Abaqus/ Explicit. The large deformation of work and the chip formation in drilling process is realized by incorporating Johnson-Cook material constitutive model and material failure criterion. In order to verify the simulation model, the simulation and corresponding drilling tests are performed for the drilling process with 3-mm diameter solid carbide drills at several combination groups of rotational speeds and feed velocities. The estimated thrust force, torque and chip morphology from the simulation are in good agreement with those tested from experiments. The combination of both simulations and experiments not only reveals obvious varying pattern of thrust force, torque with the increasing of rotational speeds and feed velocities, which is consistent with the cutting theory, but also provides a more detailed and profound knowledge about the cutting mechanism including the contribution of chisel edge, drilling stage, and stress and strain distribution, which is assumed to be helpful for the optimization of the drill structure, geometry and drilling parameters.