切削
鉛フリーα＋β黄銅「62.5Cu-1Si-Zn合金」の切削性に関する研究
2022 年 61 巻 1 号 p. 213-217
詳細
2022 年 61 巻 1 号 p. 213-217
Free–cutting brass contains 3％ lead to obtain excellent machinability, but because lead is harmful to the human body, lead regulations are being tightened in Europe, starting with the 2010 and 2014 lead control laws for drinking water–related equipment in the United States, and including RoHS regulations, ELV regulations, and the 4MS Positive List. Being affected by these increasingly strict lead regulations in Europe and the United States, demand for brass with significantly reduced lead content is on the rise.
In order to meet the needs of the times, the authors have developed the world’s first lead–free, free–cutting α+β brass “62.5Cu–1Si–Zn alloy” with a lead content of less than 0.1％.
As a result of investigating the machinability of this alloy by comparing it with CW510L, it was demonstrated that the quality of machined products made of the 62.5Cu–1Si–Zn alloy is good due to reduced cutting resistance realized by shear type chips that can be generated by the action of Si solid–solubilized in the β–phase, the presence of fine P compounds, and the effect of fine α–crystal grains.
