DYNA JOURNAL ENGINEERING

Key words:

chatter suppression, turning stability, slender tools, tuned tool holder, modal coupling, passive damping, machine tool dynamics, machining vibrations, stability lobes, tuned mass damper comparison, finite element modelling, manufacturing processes

Article type:

ARTICULO DE INVESTIGACION / RESEARCH ARTICLE

Section:

RESEARCH ARTICLES

Summary
Turning operations, particularly in internal machining, require the use of slender tools whose high dynamic flexibility promotes the onset of self-excited vibrations, thereby limiting the cutting performance. Traditionally, this issue has been addressed using anti-vibratory bars, which incorporate a damper to attenuate tool vibrations. However, their added complexity and cost have led to reluctance among end users, motivating the search for alternative solutions. This study proposes an innovative strategy based on inducing modal coupling between the tool and machine components to damp the tools, eliminating the need for anti-vibratory tools. To achieve this, a tuneable toolholder is designed with an easy integration into the machine. This toolholder enforces modal coupling with standard bars, enhancing process stability. The system operates over a wide frequency range, enabling vibration attenuation across various bar configurations. Its development is supported by theoretical analyses and simulation tools to evaluate tuning capability and optimize the dynamic response, aiming to ensure stable turning conditions.