Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Impact resistance of quenched 1045 steel bars for quick stop equipment in turning operations
Submission Author:
Lucas Melo Queiroz Barbosa , MG , Brazil
Co-Authors:
Felipe dos Anjos Rodrigues Campos, Felipe Chagas Rodrigues de Souza, Lucas Melo Queiroz Barbosa, Kauã Ferreira de Almeida, Pedro Henrique Veiga Oliveira, Leonardo Rosa Ribeiro da Silva , Álisson Rocha Machado
Presenter: Lucas Melo Queiroz Barbosa
doi://10.26678/ABCM.COBEM2023.COB2023-0502
Abstract
The main variables of the machining process depend on the chip formation process and therefore, the tribological conditions of the chip-tool interface. To study the phenomena involved, a quick-stop device is frequently used, for instantly interrupting the cut by applying a sudden impact on a swiveled toolholder. The toolholder is supported by a fusible pin, made of a brittle material that is rigid enough to withstand the machining force, but breaks easily under the impact of the quick-stop. This work consists of studying the brittleness of SAE 1045 steel pins through impact tests (Izod-type) on quenched and tempered samples, in addition to the correlation of data generated by the spring brake. The bars used as fusible pins were quenched, after heated in a muffle furnace, under different conditions of temperature, time and cooling method. The results showed the influence of quenching variables on the brittleness of the pins, allowing to choose the ideal quenching condition. In addition, the force, velocity and energy of impact by quick-stop were calculated and correlated with the respective variables for the impact tests by pendulum, with the objective of finding the ideal quenching to reduce the wear of brake components and thus increase their lifetime.
Keywords
Turning, quick-stop, Impact Test, 1045 Steel, Impact Resistance
