熱間押出し法による黄銅切削屑からの硫化マンガン分散鉛フリー快削黄銅の調製

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  • ネツカン オシダシ ホウ ニ ヨル オウドウ セッサククズ カラ ノ リュウカ マンガン ブンサン ナマリ フリーカイサクオウドウ ノ チョウセイ
  • Preparation of Lead-Free Machinable Brass dispersed MnS by Hot Extrusion of Machined Chips

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The most popular recycle process of brass machined chips wastes is remelting process. However, this process is much energy consumption. On the other hand, lead has been added conventionally in order to improve the machinability of metallic materials. The development of lead-free alloy has become an important issue since lead is harmful to the human body. In this study, MnS was applied to a substitutional material of lead to improve machinability and a direct consolidation process from machined chips of 60/40 brass has been developed. Mixture of machined chips of 60/40 brass and the MnS powder of 0.1-1.0 mass% were consolidated by hot extrusion. Extrusion was conducted at 773 K and an extrusion ratio of 11.1. After the tensile test of the extruded specimen, the tensile strength of the extruded specimen with MnS and that without MnS showed a nearly equivalent value. And tensile strength of the extruded specimen with MnS particles of 106 µm in diameter was slightly higher than that of 45 µm in diameter. Elongation of the extruded specimen decreased with an increase of the MnS additive amount. The cutting resistance test and the chip observation indicated that an increase of MnS additive improved machinability.

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