Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 04, 2024 - October 05, 2024
Until now, Pb added bronze has been used to improve machinability, but various regulations are in place due to the harmfulness of Pb to the human body and the environment. For this reason, Bi-based Pb-free bronze has been developed, but it has the problem of being inferior in machinability to Pb-containing bronze. In this study, the effect of Bi addition on the machinability of Pb-free bronze was investigated. In the experiment, a two dimensional cutting test apparatus was used to perform cutting experiments on bronze with different concentrations of Bi added, and friction and shear yield forces were investigated. In addition, a SEM was used to observe the cutting chips and the state of the Bi. As a result, it was found that the addition of Bi reduces the friction coefficient between the tool and the chips and the shear yield force of the chips, improving machinability. It was also found that the effect increases when the amount of Bi added is increased up to 1.0%.
