Study of Dynamic Behavior of Boring Tool Holder and Optimization of Tool Parameters using Computational Models

摘要

One way of improving the damping of the system is by adding damping to the tool side, since workpiece is a rotating structure in boring. The study includes the feasibility of using a damped tool holder for boring tools and other cost effective techniques to improve the stability during machining. Finite Element Analysis is performed to study dynamic behavior of EN 31 steel tool holder and also replacing it by composite tool holder, lead filled EN 31 steel tool holder. Modal analysis, Harmonic analysis and Transient dynamic analysis are performed and results are analyzed. In addition, to optimize tool parameters, a Genetic Algorithm is developed. The developed Genetic Algorithm gives the optimized value of the inertia mass of the boring tool holder. Based on the optimized value obtained using Genetic Algorithm, steel tool holder with lead at its core is modeled. Finally, boring tool holder with lead is designed and tested in CNC machining center. Surface finish of machined workpieces are measured and compared.