Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Development of viscoelastic dynamic neutralizer to minimize the amplification of regenerative vibrations in simultaneous turning
Submission Author:
Bruno Edson Klipstein , SC
Co-Authors:
Bruno Edson Klipstein, Milton Polli, Carlos Alberto Bavastri, Vinicius Sell Goncalves
Presenter: Bruno Edson Klipstein
doi://10.26678/ABCM.COBEM2023.COB2023-0264
Abstract
Regenerative vibrations have been a chronic problem studied due to the complexity of the factors that arise during machining. When it comes specifically to simultaneous external turning, there are few studies that address the incidence of regenerative vibrations in machines with this constructive characteristic. Machines with greater material removal capacity have been increasingly present in the metallurgical industries. Decreased productivity, reduced tool life and surface quality problems are common challenges in this type of machine in the dynamic instability stage, due to the low dynamic stiffness in situations such as machining long shafts. One of the objectives of this work is to understand the main factors associated with the dynamics of the simultaneous external turning process. This work aims to achieve two primary objectives: firstly, to comprehensively understand the principal factors linked to the dynamics of the simultaneous external turning process, and secondly, to diffuse neutralizers in industrial applications with high material removal rates. For this, the influence of the machine-support-tool set with the cutting parameters was analyzed in view of the dynamic stability of the process. The natural frequency of the tool and support was determined considering the inserts and supports of both turrets through impact tests with simultaneous measurement of the vibratory response. Subsequently, the turning of an electric motor shaft was carried out with the addition of passive damping through a dynamic neutralizer previously made to minimize the amplification of regenerative vibrations in the upper tower that was presenting dynamic instability. Subsequently, the turning of an electric motor shaft was carried out with the addition of passive damping through a dynamic neutralizer made of Dyal 601 and a rectangular key constructed to effectively operate at the natural frequency of 2080 Hz and 10 g peak-peak of the upper turret tool holder. The evaluation of the process stability was carried out by monitoring the vibration acceleration signals. As a result, it was possible to obtain a better understanding of the behavior of regenerative vibrations in simultaneous external turning, as well as verify the effectiveness of the neutralizer for minimizing the amplification of vibrations in machines with this dynamic characteristic through the use of viscoelastic dynamic neutralizer.
Keywords
simultaneous turning, Viscoelastic Dynamic Neutralizer, Chatter
